JP6026750B2 - Scroll type expander and fluid machine having the same - Google Patents

Description

  The present invention relates to a scroll type expander and a fluid machine including the same.

  In Patent Document 1, a high-temperature and high-pressure gas-phase working medium (refrigerant) evaporated by an evaporation generator is introduced into an expansion chamber through a through-hole formed in a central portion of a base plate (base portion) of a fixed scroll. A scroll type expander configured as described above is described. In such a scroll type expander, since the working fluid supplied from the outside is directly guided to the expansion chamber, the heat loss and pressure loss of the working fluid in the scroll type expander are suppressed.

Japanese Patent No. 4537948

  However, in the scroll type expander described in Patent Document 1, when a working fluid that is not sufficiently vaporized by the evaporation generator is supplied, that is, when a liquid-phase working fluid is introduced into the expansion chamber Is not taken into account. When a liquid-phase working fluid is introduced into the expansion chamber, the liquid-phase working fluid enters the sliding and rotating parts inside and flows lubricating oil.For example, seizure occurs on the thrust bearing. May occur. For this reason, the scroll type expander described in Patent Document 1 has problems in terms of durability and reliability.

Here, in order to prevent the liquid-phase working fluid from being introduced into the expansion chamber, the working fluid supplied from the outside is introduced into the expansion chamber via a suction chamber or the like that can store the liquid-phase working fluid. It is also conceivable to configure a scroll type expander as described above.
However, if it does so, components (casing etc.) for forming the said suction chamber etc. will be needed newly, a structure will be complicated, and it will cause a cost increase and the enlargement of an apparatus. Further, since the suction chamber or the like has a certain volume, the pressure loss or heat loss of the working fluid may occur in the suction chamber or the like, which may increase energy loss.

  The present invention has been made paying attention to such a situation, and has a scroll type expander having a relatively simple structure, low energy loss, high durability and reliability, and the same. An object is to provide a fluid machine.

According to one aspect of the present invention, the fixed scroll and the movable scroll having the scroll portion standing on the base portion are provided, and the working fluid vaporized by the evaporator after being liquefied by the condenser and the scroll portion of the fixed scroll and the scroll portion scroll type expander that generates power by Rise Zhang in the expansion chamber formed between the scroll portion of the movable scroll is formed in the base of the fixed scroll, a suction port that opens to the outside, the fixed scroll A working fluid passage that extends from the suction port to an introduction port that opens into the expansion chamber and guides the working fluid that has flowed into the suction port to the expansion chamber. the movable scan and said actuation fluid passage there is no space having a sectional area larger than the fixed portion of the scroll-type expansion machine A rotation prevention mechanism that is disposed between the base of the roll and receives a thrust force acting on the movable scroll and prevents the rotation of the movable scroll, and the rotation prevention mechanism uses the ball as a rolling member. This is a ball coupling type anti-rotation mechanism.

Experiments have confirmed that a ball coupling type rotation prevention mechanism using a ball as a rolling member has high durability even in a state of insufficient lubrication.
The scroll expander is configured to receive a thrust force acting on the movable scroll by such a rotation prevention mechanism and to prevent the rotation of the movable scroll, so that a liquid-phase working fluid is supplied from the outside. Even when lubrication is insufficient, no problems occur and high durability and reliability can be secured. In addition, since the working fluid passage is formed in the base of the fixed scroll and the working fluid supplied from the outside is directly guided to the expansion chamber, the structure is relatively simple, and the pressure loss and heat loss of the working fluid are relatively small. Can also be suppressed.

It is a figure which shows the structure of the waste-heat utilization apparatus to which the scroll type expander by embodiment of this invention was applied. It is a figure which shows the structure of the pump integrated expander provided with the said scroll expander. FIG. 3 is an enlarged view around a rotation prevention mechanism of FIG. 2. It is a figure which shows the modification of the said pump integrated expander. It is a figure which shows the rotation prevention mechanism in a modification. It is a figure which shows the other rotation prevention mechanism in a modification. It is a figure which shows the structure of the generator integrated expander provided with the said scroll type expander.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a configuration of a waste heat utilization apparatus 1 to which a scroll type expander according to an embodiment of the present invention is applied. The waste heat utilization device 1 is a device that is mounted on a vehicle and collects and uses the waste heat of the engine 10. The Rankine cycle device 2 and a transmission mechanism 3 that transmits the output of the Rankine cycle device 2 to the engine 10. And the control unit 4.

  The engine 10 is a water-cooled internal combustion engine, and is cooled by cooling water flowing through the cooling water circulation path 11. An evaporator 22 of the Rankine cycle device 2 is disposed in the cooling water circulation path 11.

  The Rankine cycle device 2 recovers waste heat of the engine 10 from the cooling water of the engine 10, converts it into power, and outputs it. The Rankine cycle device 2 has a circulation path 21 for working fluid (refrigerant), and an evaporator 22, an expander 23, a condenser 24, and a pump 25 are arranged in this order in the circulation path 21. .

The evaporator 22 is a heat exchanger that heats and evaporates (vaporizes) the working fluid by performing heat exchange between the cooling water that has absorbed heat from the engine 10 and the working fluid.
The expander 23 is a scroll expander that generates power by expanding the working fluid that has been heated by the evaporator 22 into superheated steam and converting it into rotational energy.
The condenser 24 is a heat exchanger that cools and condenses (liquefies) the working fluid by performing heat exchange between the working fluid that passes through the expander 23 and the outside air.
The pump 25 is a mechanical pump that sends the working fluid liquefied by the condenser 24 to the evaporator 22. The working fluid circulates in the circulation path 21 by driving the pump 25 to suck and discharge the working fluid.

Here, in the present embodiment, the expander 23 and the pump 25 are configured as a “pump-integrated expander 27” in which the rotary shaft 26 is connected. That is, the rotating shaft 26 of the pump-integrated expander 27 has a function as an output shaft of the expander 23 and a function as a drive shaft of the pump 25.
The Rankine cycle device 2 is activated by first driving the pump 25 (pump portion in the pump-integrated expander 27) by the engine 10, and then the expander 23 (expansion device in the pump-integrated expander 27). When the portion) generates sufficient power, the pump 25 is driven by the power generated by the expander 23.

The transmission mechanism 3 includes a pulley 31 attached to the rotary shaft 26 of the pump-integrated expander 27, a crank pulley 32 attached to the crankshaft 10a of the engine 10, and a belt wound around the pulley 31 and the crank pulley 32. 33, and an electromagnetic clutch 34 provided between the rotary shaft 26 of the pump-integrated expander 27 and the pulley 31.
Then, the electromagnetic clutch 34 is turned on (engaged) / off (released) so that power can be transmitted / interrupted between the engine 10 and the Rankine cycle device 2 (specifically, the pump-integrated expander 27). It has become.

The control unit 4 has a function of controlling the operation of the electromagnetic clutch 34, and controls the operation / stop of the Rankine cycle device 2 by controlling the electromagnetic clutch 34 to be turned on / off.
That is, the control unit 4 activates the Rankine cycle device 2 by turning on (fastening) the electromagnetic clutch 34 and operating the pump 25 (pump portion in the pump-integrated expander 27) by the engine 10. Thereafter, when the expander 23 (the expander portion in the pump-integrated expander 27) is operated to generate power, a part of the power generated by the expander 23 drives the pump 25, and the remaining power. Is transmitted to the engine 10 via the transmission mechanism 3 to assist the output (driving force) of the engine 10.

  Here, although omitted in the figure, an expander bypass path and a bypass valve for opening and closing the expander bypass path are provided, and if necessary (for example, when overheating of the working fluid in the evaporator 22 is insufficient) ) The working fluid may be circulated by opening the bypass valve to bypass the expander 23. Further, the evaporator 22 may be configured to exchange heat between the working fluid of the Rankine cycle device 2 and the exhaust of the engine 10.

FIG. 2 shows the configuration of the pump-integrated expander 27.
In the pump-integrated expander 27, a rotary shaft 26 includes a pump 25 that circulates the working fluid of the Rankine cycle device 2 and an expander 23 that generates power by expanding the working fluid heated and vaporized by the evaporator 22. It is the fluid machine comprised integrally via.
The pump-integrated expander 27 includes an expansion unit 50 constituting the expander 23 and a pump unit 60 constituting the pump 25.

The expansion unit 50 (scroll type expander) includes a fixed scroll 51, an expander housing 52, and a movable scroll 53.
The fixed scroll 51 has a disk-shaped base 51a and a spiral scroll 51b standing on one surface (the left surface in the figure) of the base 51a.
The expander housing 52 is formed in a cylindrical shape having a large inner diameter portion 52 a and a small inner diameter portion 52 b, and a part of the inner peripheral surface of the large inner diameter portion 52 a is a part of the outer peripheral surface of the base portion 51 a of the fixed scroll 51. The part is fitted.
The movable scroll 53 is accommodated in the large inner diameter portion 52 a of the expander housing 52. Similar to the fixed scroll 51, the movable scroll 53 has a disk-like base 53a and a spiral scroll 53b erected on one surface (right side in the drawing) of the base 53a. In addition, a cylindrical portion 53c that protrudes toward the pump unit 60 is formed on the other surface (the left surface in the drawing) of the base portion 53a.

The fixed scroll 51 and the movable scroll 53 are arranged so that the scroll portions 51 b and 53 b are engaged with each other, and an expansion chamber 54 that expands the working fluid between the scroll portion 51 b of the fixed scroll 51 and the scroll portion 53 b of the movable scroll 53. Is formed.
Near the center of the base 51a of the fixed scroll 51, a working fluid passage 51e extending from the suction port 51c that opens to the outside to the introduction port 51d that opens to the expansion chamber 54 is formed. The working fluid passage 51e has a cross-sectional area that is less than or equal to the opening area of the suction port 51c. Then, the working fluid sent to the expander 23 (expansion unit 50) via the evaporator 22 flows from the suction port 51c and is guided to the expansion chamber 54 via the working fluid passage 51e and the introduction port 51d. It is burned.

An eccentric bush 83 is provided inside the cylindrical portion 53 c formed on the base portion 53 a of the movable scroll 53 via a needle bearing 55. The eccentric bush 83 constitutes a driven crank mechanism 80 described later.
The working fluid guided to the expansion chamber 54 expands in the expansion chamber 54, and the movable scroll 53 performs a turning motion with respect to the fixed scroll 51 as the working fluid expands in the expansion chamber 54. The turning motion of the movable scroll 53 is converted into the rotational motion of the rotary shaft 26 by the driven crank mechanism 80.

  Here, in order to prevent the rotation of the movable scroll 53 during the turning motion and to receive a thrust force acting on the movable scroll 53, the base 53a of the movable scroll 53 and the end face (fixed portion) of the expander housing 52 facing the base 53a. Between them, a rotation prevention mechanism 56 is arranged.

FIG. 3 is an enlarged view around the rotation prevention mechanism 56.
The rotation prevention mechanism 56 is a ball coupling type rotation prevention mechanism using a ball as a rolling member, and is a ring attached to a step surface 52c that connects the large inner diameter portion 52a and the small inner diameter portion 52b of the expander housing 52. Between the fixed side plate 561, the ring-like movable side plate 562 attached to the surface of the base 53 a of the movable scroll 53 opposite to the scroll portion 53 b, and the fixed side plate 561 and the movable side plate 562. A plurality of balls 563 that are movably held.

  In the stationary plate 561, annular race grooves 564 having a circular arc cross section are formed at equal intervals in the circumferential direction. The annular race groove 564 is formed so as to correspond to the turning motion of the movable scroll 53.

  On the movable side plate 562, hemispherical or mortar-shaped recesses 565 that accommodate the balls 563 in a freely rollable manner are formed at equal intervals in the circumferential direction. The number of the recesses 565 is the same as the number of the annular race grooves 564 of the fixed side plate 561. The movable plate 562 has an inner edge fixed to the base 53 a of the movable scroll 53 by a pin 566, and a predetermined gap is provided between the outer edge including the portion where the recess 565 is formed and the base 53 a of the movable scroll 53. A gap c is provided. This gap c allows elastic deformation of the movable side plate 562 toward the movable scroll 53 on the outer edge side.

Each ball 563 is disposed between the annular race groove 564 of the fixed side plate 561 and the concave portion 565 of the movable side plate 562 so as to roll freely.
When the movable scroll 53 turns, each ball 563 rolls along the corresponding annular race groove 574 of the corresponding fixed side plate 561, thereby preventing the movable scroll 53 from rotating.

  Returning to FIG. 2, the pump unit 60 is configured as a gear pump, and includes a drive gear 61 fixed to the rotating shaft 26, a driven gear 63 fixed to the driven shaft 62 and meshed with the drive gear 61, and the drive gear 61. And a pump housing 65 that forms a pump chamber 64 that houses the driven gear 63.

The pump housing 65 includes a first housing 66 having a recessed portion in which the drive gear 61 and the driven gear 63 are disposed on the surface on the expansion unit 50 side, and the recessed portion disposed on the expansion unit 50 side of the first housing 66. The recessed portion of the first housing 66 closed by the second housing 67 serves as a pump chamber 64.
Further, the second housing 67 is formed with a cylindrical portion 67 a protruding toward the expansion unit 50, and the outer peripheral surface of the cylindrical portion 67 a is fitted to the inner peripheral surface of the small inner diameter portion 52 b of the expander housing 52. Match.

  The rotating shaft 26 extends through the pump housing 65 (the first housing 66 and the second housing 67), and has a large-diameter portion 26a at the end on the expansion unit 50 side. The rotary shaft 26 is rotatably supported by a ball bearing 68 provided on the first housing 66 side and a ball bearing 69 provided on the inner side of the cylindrical portion 67 a of the second housing 67. The driven shaft 62 is rotatably supported by bearings 70 and 71 disposed in the first housing 66 and the second housing 67, respectively.

  A pulley 31 and an electromagnetic clutch 34 constituting the transmission mechanism 3 are disposed on one end side (left side in the drawing) of the rotating shaft 26. Further, the other end side (right side in the drawing) of the rotating shaft 26 is connected to the movable scroll 52 via a driven crank mechanism 80.

The driven crank mechanism 80 includes a flange portion 81 fixed to the end surface of the large-diameter portion 26a of the rotary shaft 26, a crank pin 82 provided on the end surface of the flange portion 81 so as to be shifted from the axis of the rotary shaft 26, and a movable crank mechanism 80. An eccentric bush 83 provided inside the cylindrical portion 53 c of the scroll 53 via a needle bearing 55 is configured. The crankpin 82 is inserted through an insertion hole formed in the eccentric bush 83 at a position shifted from the center of the bush, and the eccentric bush 83 is configured to be swingable around the crankpin 82. As a result, the crank pin 82 also performs a turning motion by the turning motion of the eccentric bush 83.
The driven crank mechanism 80 converts the turning motion of the movable scroll 53 into the rotational motion of the rotary shaft 26, and the pump unit 60 is driven by the rotation of the rotary shaft 26.

  A counterweight (balance weight) 84 is fixed to the eccentric bush 83 in order to balance the eccentric bush 83 and the movable scroll 52 and suppress the occurrence of vibration in the expansion unit 50. Further, the swing range of the eccentric bush 83 around the crankpin 82 is restricted by the engagement between the restriction hole 81 a provided in the flange portion 81 and the restriction protrusion 83 b provided in the eccentric bush 83.

  In the pump-integrated expander 27 described above, the expansion unit 50 configured as a scroll expander generates power when the working fluid expands in the expansion chamber 54. More specifically, the movable scroll 53 orbits as the working fluid expands in the expansion chamber 54, and the orbiting movement of the movable scroll 54 is caused to rotate by the driven crank mechanism 80. The pump unit 60 is driven by this rotational motion (driving force).

  Here, the working fluid supplied from the outside to the expansion unit 50 is introduced into the expansion chamber 54 only through the working fluid passage 51e formed in the base 51a of the fixed scroll 51, and in the middle of the working fluid passage 51e. There is no space (buffer space) such as a suction chamber having a large cross-sectional area. For this reason, the part for forming the said buffer space is unnecessary, the increase in a number of parts can be suppressed and a simple structure can be implement | achieved. Moreover, since the working fluid is introduced into the expander 54 only through the working fluid passage 51e, the pressure loss and heat loss of the working fluid in the expansion unit 50 can be suppressed, and the energy loss can be reduced.

  By the way, in such a configuration in which the working fluid supplied from the outside is introduced into the expansion chamber 54 only through the working fluid passage 51e, the liquid-phase working fluid is introduced into the expansion chamber 54, and as a result. There is a concern that the lubricating oil inside will be poured and the sliding part and the rotating part will be insufficiently lubricated.

In this regard, in the expansion unit 50 according to the present embodiment, the ball is used as a rolling member as a structure that rotates to prevent the rotation of the movable scroll 53 and slides under the thrust force acting on the movable scroll 53. The ball coupling type rotation prevention mechanism 56 is used. It has been confirmed through experiments that such a rotation prevention mechanism 56 has high durability without causing problems such as seizure even in a state of insufficient lubrication.
For this reason, according to the expansion unit (scroll type expander) in the present embodiment, it is possible to achieve both the above-described simple structure and reduction of energy loss, and ensuring high durability and reliability. .

  Further, in the rotation prevention mechanism 56 in the present embodiment, a predetermined gap c is provided between the outer edge side including the portion where the concave portion 565 of the movable side plate 562 is formed and the base portion 53a of the movable scroll 53, so that the movable side plate 562 is movable. Elastic deformation of the side plate 562 is allowed. For this reason, even when a large thrust force is applied to the rotation prevention mechanism 56, the ball 563 is prevented from being deformed and the like, and function deterioration and noise generation can be prevented.

In addition, this invention is not restrict | limited to the said embodiment, Of course, a various deformation | transformation and change are possible based on the technical idea of this invention. Hereinafter, some modified examples will be described.
In the above embodiment, the working fluid passage 51e formed in the base 51a of the fixed scroll 51 extends substantially in the horizontal direction, but the working fluid passage may be formed in an L shape as shown in FIG. Specifically, the working fluid passage includes a vertical passage 51f extending in a substantially vertical direction from a suction port 51c opened on the upper surface of the base 51a of the fixed scroll 51, and a horizontal passage 51g extending in a substantially horizontal direction from the vertical passage 51f. You may have.
In this way, the portion of the working fluid circulation path 21 extending from the evaporator 22 to the expansion unit 50 (expander 23) can be disposed above the expansion unit 50, so that, for example, there is a margin in the space on the side of the expansion unit 50. This is convenient when there is no space, or when the space is used for other purposes, increasing the degree of freedom in layout and making effective use of the space possible.

  In this case, more preferably, as shown in FIG. 4, the horizontal passage 51g extends in the horizontal direction from the middle of the vertical passage 51f. In other words, the lower end of the vertical passage 51f is positioned below the horizontal passage 51g. Thus, the working fluid passage is configured. In this way, the portion of the vertical passage 51f located below the horizontal passage 51g serves as a liquid reservoir 51h and has a function of accumulating a liquid-phase working fluid, so that it is introduced into the expansion chamber 54. The amount of liquid phase working fluid can be reduced.

Further, instead of the rotation prevention mechanism 56 in the above embodiment, a rotation prevention mechanism 57 as shown in FIG. 5 may be used.
In FIG. 5, the rotation prevention mechanism 57 includes a ring-shaped fixed side plate 571 attached to the step surface 52 c of the expander housing 52, a ring-shaped movable side plate 572 attached to the base 53 a of the movable scroll 53, and And a plurality of balls 573 that are rotatably held between the fixed plate 571 and the movable plate 572.

In the fixed side plate 571 and the movable side plate 572, annular race grooves 574 each having a circular arc cross section are formed at equal intervals in the circumferential direction. The annular race groove 574 is formed so as to correspond to the turning motion of the movable scroll 53.
Each ball 573 is disposed between the annular race groove 574 of the fixed side plate 571 and the annular race groove 574 of the movable side plate 572 so as to roll freely.
When the movable scroll 53 turns, each ball 573 rolls along the corresponding annular race groove 574, thereby preventing the movable scroll 53 from rotating.

Further, instead of the rotation prevention mechanism 56, a rotation prevention mechanism 58 as shown in FIG. 6 may be used.
In FIG. 6, the rotation prevention mechanism 58 includes a fixed race 581 and a fixed ring 582 attached to the step surface 52 c of the expander housing 52, a movable race 583 and a movable ring 584 attached to the base 53 a of the movable scroll 53, and Have
The fixed race 581 and the movable race 583 have ring shapes that are flat on both sides, and circular ball receiving portions (through holes) 585 are formed at equal intervals in the circumferential direction on the fixed ring 582 and the movable ring 584, respectively. Has been.

The ball 586 is held by the fixed race 581 and the movable race 582 while being disposed between the ball receiving portions 585 of the fixed ring 582 and the movable ring 584.
When the movable scroll 53 turns, each ball 586 rolls along the inner periphery of the through hole 585, thereby preventing the movable scroll 53 from rotating. In this rotation prevention mechanism 58, the fixed race 581 corresponds to a fixed side plate, and the movable race 583 corresponds to a movable side plate.

These rotation prevention mechanisms 57 and 58 are also ball coupling type rotation prevention mechanisms using balls as rolling members. Like the rotation prevention mechanism 56 in the above-described embodiment, seizure or the like may occur even in a state of insufficient lubrication. It has been confirmed by experiments that no defects occur and it has high durability. As a result, similar to the above-described embodiment, in the scroll expander, it is possible to achieve both the above-described simple structure and reduction of energy loss, and ensuring high durability and reliability.
The rotation prevention mechanism may be a ball coupling type rotation prevention mechanism using a ball as a rolling member, and is not limited to the one described above. For example, it has a ring-shaped intermediate plate between the fixed side plate and the movable side plate, between each groove formed on the fixed side plate and each groove formed on one surface of the intermediate plate, and It is good also as a rotation prevention mechanism which has the structure by which the ball | bowl was arrange | positioned so that rolling was possible between each groove | channel formed in the other surface of the intermediate | middle plate, and each groove | channel formed in the movable side plate, respectively. Moreover, the end surface of the movable scroll may be formed so as to function as a movable side plate.

In the above embodiment, the pump 25 and the expander 23 of the Rankine cycle apparatus 2 are integrally configured to be a pump-integrated expander (fluid machine) 26, but may be used as a single expander. Alternatively, the expander 23 and the generator of the Rankine cycle device 2 may be configured integrally to form a generator-integrated expander (fluid machine). In this case, the generator is driven by the power generated by the expander 23, and the power generated by the generator is supplied to, for example, an in-vehicle battery or an in-vehicle motor (both not shown).
Hereinafter, the configuration of the generator-integrated expander will be described. Elements common to the above-described pump-integrated expander 26 (FIG. 2) are denoted by the same reference numerals and description thereof is omitted.

FIG. 7 shows the structure of the generator-integrated expander.
As shown in FIG. 7, the generator-integrated expander 90 includes an expansion unit 50 that forms the expander 23, and a power generation unit 100 that forms the generator. The rotating shaft 26 of the generator-integrated expander 90 has a function as an output shaft of the expansion unit 50 (expander 23) and a function as an input shaft of the power generation unit 100 (generator).

The power generation unit 100 includes a generator housing 110 and a generator 120 disposed in the generator housing 110.
The generator housing 110 includes a first housing 112 that forms an accommodation space 111 of the generator 120 that opens to the expansion unit 50 side, and a first housing 112 that is disposed on the expansion unit 50 side of the first housing 112 and closes the accommodation space 111. 2 housing 113. The second housing 113 is formed with a cylindrical portion 113 a that protrudes toward the expansion unit 50, and the outer peripheral surface of the cylindrical portion 113 a is fitted to the inner peripheral surface of the small inner diameter portion 52 b of the expander housing 52. .

  The generator 120 includes a rotor (rotor) 121 made of, for example, a permanent magnet fixed to the rotating shaft 26, and a stator (stator) fixed to the inner peripheral surface of the first housing 112 so as to surround the rotor 121. 122. The stator 122 includes a yoke 122a and, for example, three sets of coils 122b wound around the yoke 122a, and generates a three-phase alternating current as the rotor 102 rotates.

  The rotating shaft 26 extends through the generator housing 110 (the first housing 112 and the second housing 113), and has a large-diameter portion 26a at the end on the expansion unit 50 side. The rotating shaft 26 is rotatably supported by a ball bearing 68 provided on the first housing 112 side and a ball bearing 69 provided on the inner side of the cylindrical portion 113a of the second housing 113. Further, the other end side (right side in the drawing) of the rotating shaft 26 is connected to the movable scroll 52 via a driven crank mechanism 80.

  As in the above-described embodiment, the turning motion of the movable scroll 53 is converted into the rotational motion of the rotary shaft 26 by the driven crank mechanism 80, whereby the generator 120 is driven to generate power. Of course, the above-described modification of the pump-integrated expander 26 can also be applied to the generator-integrated expander 90.

  DESCRIPTION OF SYMBOLS 1 ... Waste heat utilization apparatus, 2 ... Rankine cycle apparatus, 22 ... Evaporator, 23 ... Expander, 24 ... Condenser, 25 ... Pump, 26 ... Rotating shaft, 27 ... Pump integrated expander (fluid machine), 50 ... Expansion unit (scroll type expander), 51 ... Fixed scroll, 51a ... Base, 51b ... Scroll part, 51c ... Suction port, 51d ... Inlet, 51e ... Working fluid passage, 51f ... Vertical passage, 51g ... Horizontal passage, 51h ... Liquid reservoir, 52 ... Expander housing, 52c ... Step surface (end face), 53 ... Movable scroll, 53a ... Base, 53b ... Scroll part, 54 ... Expansion chamber, 56-58 ... Rotation prevention mechanism, 60 ... Pump Unit: 90 ... generator-integrated expander (fluid machine), 100 ... power generation unit, 561, 571 ... fixed side plate, 562, 572 ... movable side plate, 563, 5 3 ... ball, 564 and 574 ... annular race groove

Claims (7)

It has a fixed scroll and a movable scroll in which a scroll portion is erected at the base, and the working fluid vaporized in the evaporator after being liquefied by the condenser is between the scroll portion of the fixed scroll and the scroll portion of the movable scroll. a scroll-type expander that generates power by Rise Zhang in the expansion chamber formed,
A suction port formed at the base of the fixed scroll and opening to the outside ;
Wherein formed in the base of the fixed scroll, wherein a working fluid passage for introducing the working fluid into the expansion chamber which has flowed into the suction port extends to inlet opening to the expansion chamber from the suction port, the on its way The working fluid passage without a space having a larger cross-sectional area than the working fluid passage ; and
A rotation preventing mechanism that is disposed between a fixed portion of the scroll expander and a base of the movable scroll, receives a thrust force acting on the movable scroll, and prevents rotation of the movable scroll;
With
The rotation prevention mechanism is a ball coupling type rotation prevention mechanism using a ball as a rolling member.
Scroll type expander.
The rotation prevention mechanism is
A fixed side plate attached to the fixed part;
A movable side plate attached to the base of the movable scroll;
A ball rotatably held between the fixed plate and the movable plate;
Including
The annular race groove having an arc-shaped groove cross section is formed in at least the fixed side plate of the fixed side plate and the movable side plate, and the ball rolls along the annular race groove. The scroll expander described.   The scroll type expander according to claim 1 or 2, wherein a gap that allows elastic deformation of the movable side plate is provided between a base portion of the movable scroll and the movable side plate.   The scroll type expander according to any one of claims 1 to 3, wherein the working fluid passage extends substantially horizontally from the suction port and is connected to the introduction port.   The said working fluid channel | path has a vertical channel | path extended in the substantially vertical direction from the said suction port, and a horizontal channel | path extended in the substantially horizontal direction from the said vertical channel | path, and connected to the said inlet. The scroll expander as described in one.   The scroll type expander according to any one of claims 1 to 5 and a pump unit that is driven by power generated by the scroll type expander and sucks and discharges the working fluid are integrally configured. Is a fluid machine.   A fluid machine in which the scroll expander according to any one of claims 1 to 5 and a power generation unit that generates power by being driven by power generated by the scroll expander are integrally configured.