JP2013144949A - Scroll type fluid machinery, rankine cycle and waste heat utilizing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll type fluid machinery that can exhibit a high performance when being used as an expander of a Rankine cycle and a blower, and to provide Rankine cycle that can exhibit a high performance and to provide a waste heat utilizing apparatus.SOLUTION: In the scroll type fluid machinery, a movable scroll 30 is biased toward a stationary scroll 18 by a pushing spring 46. A biasing force Fof the pushing spring 46 exceeds a vertical component force Fd2n of a load Fd2 acting in the tangential direction of a revolution circle C along which the movable scroll 30 revolves when the scroll type fluid machinery functions as a blower, the vertical component force Fd2n being perpendicular to a flat surface Lp connecting a driving axial line Od and a revolution axial line Oc.

Description

  The present invention relates to a scroll type fluid machine, a Rankine cycle including the scroll type fluid machine, and a waste heat utilization apparatus including the Rankine cycle.

  Patent Document 1 discloses a conventional waste heat utilization device. This waste heat utilization apparatus includes a Rankine cycle that includes a pump, a boiler, an expander, and a condenser and circulates a working fluid. In addition, the waste heat utilization device can drive the rotating shaft of the expander and includes a motor generator that generates electric power using the rotating shaft.

  As the expander, a scroll type fluid machine described in Patent Document 2 can be adopted. As shown in FIG. 6, the scroll type fluid machine includes a rotating shaft 90, a fixed scroll 91, a movable scroll 92, a pin 94, a bush 95, and a balancer 96.

  The rotation shaft 90 extends along the rotation axis Os and can rotate around the rotation axis Os. The fixed scroll 91 has a fixed spiral wall 91b formed on a fixed end plate (not shown). The movable scroll 92 has a movable spiral wall 92b formed on a movable end plate (not shown). The movable scroll 92 is disposed so as to face the fixed scroll 91, thereby forming a working chamber 93 whose volume can be changed between the movable scroll 92 and the fixed scroll 91. A boss provided with a bearing device (not shown) is formed on the movable side end plate of the movable scroll 92, and the cylindrical inner peripheral surface of the boss is a revolving surface concentric with the revolution axis Oc. . The rotation axis Os and the revolution axis Oc are separated by the revolution radius R.

  Further, a pin 94 is integrally projected on the rotating shaft 90. The pin 94 extends along the drive axis Od. The rotation axis Os and the drive axis Od are separated by an eccentric distance e. The outer peripheral surface of the pin 94 is a cylindrical driving surface 94a concentric with the driving axis Od.

  A cylindrical bush 95 is provided between the pin 94 and the movable scroll 92. The bush 95 has a pin hole, and the inner peripheral surface of the pin hole is a cylindrical driven surface 95 a that fits with the driving surface 94 a of the pin 94. Further, the outer peripheral surface of the bush 95 is a revolving surface 95b that fits with the revolving surface via a bearing device. The bush 95 is supported so as to be rotatable around the drive axis Od by fitting the drive surface 94a and the driven surface 95a. The bush 95 can revolve along the revolution circle C having the revolution radius R around the revolution axis Oc together with the movable scroll 92 by fitting the revolution surface and the revolution surface 95b. The bush 95 may integrally include a balancer 96 that cancels out imbalance during the revolving motion of the movable scroll 92.

  In the waste heat utilization apparatus, in the Rankine cycle, the pump pumps the working fluid and the boiler heats the working fluid. The expander expands and depressurizes the working fluid, and the condenser cools the working fluid. For this reason, if, for example, the waste heat of the vehicle is introduced into the boiler, the rotating shaft of the expander rotates and the motor generator generates power. Thus, with this waste heat utilization device, it is possible to recover energy based on waste heat and cool the waste heat of the vehicle.

  Further, in this waste heat utilization device, when the pump fails, the rotating shaft of the expander can be driven by the motor generator to circulate the working fluid. In this case, the expander functions as a blower. Thus, in this waste heat utilization apparatus, it is possible to ensure cooling of the waste heat at the time of pump failure.

JP 2010-174848 A Japanese Patent Laid-Open No. 56-129791

  However, the scroll type fluid machine described in Patent Document 2 has been developed exclusively as a compressor for compressing a refrigerant. When used as an expander or blower of Rankine cycle, it is difficult to obtain sufficient performance.

  The present invention has been made in view of the above-described conventional situation, and it is a problem to be solved to provide a scroll type fluid machine that can exhibit high performance when used as an expander or blower of Rankine cycle. Yes. Moreover, this invention also makes it the subject which should be solved to provide the Rankine cycle which can exhibit high performance, and also a waste-heat utilization apparatus.

The scroll type fluid machine of the present invention includes a rotation shaft that extends along the rotation axis and is rotatable about the rotation axis.
A fixed scroll having a fixed spiral wall formed on the fixed end plate;
A movable-side spiral wall is formed on the movable-side end plate, and a working chamber whose volume can be changed is formed between the movable scroll and the fixed scroll, and a revolving radius from the rotation axis A movable scroll formed with a revolving surface concentric with a revolving axis separated by a distance,
A drive unit that is supported by the rotary shaft and extends along a drive axis that is separated from the rotary axis by an eccentric distance, and has a drive surface concentric with the drive axis;
A driving surface provided between the driving unit and the movable scroll, and having a driven surface that fits the driving surface and a revolving surface that fits the revolving surface; the driving surface and the driven surface; And can be revolved along the revolution circle of the revolution radius around the revolution axis together with the movable scroll by fitting between the revolving surface and the revolution surface. In a scroll type fluid machine having a bush,
The movable scroll is a plane that connects the drive axis and the revolution axis among loads acting in the tangential direction of the revolution circle when the scroll is revolving when the scroll fluid machine functions as a blower. It is urged toward the fixed scroll by an urging means having an urging force exceeding a vertical component force orthogonal to (Claim 1).

  The inventors have investigated the reason why it is difficult to obtain sufficient performance with the conventional scroll type fluid machine as follows. And based on this investigation, it came to complete the scroll type fluid machine of this invention.

  That is, when the conventional general scroll type fluid machine functions as an expander in the Rankine cycle in the waste heat utilization apparatus, the working fluid is expanded and depressurized in the working chamber 93 as shown in FIG. The working chamber 93 moves from the center side toward the outer periphery side while increasing the volume. For this reason, the movable scroll 92 revolves along the revolution circle C around the revolution axis Oc. At the same time, as shown in FIG. 7A, the bush 95 revolves around the revolution axis Oc along the revolution circle C clockwise in the figure. For this reason, the rotating shaft 90 rotates around the rotation axis Os clockwise in the figure. The motor generator and the alternator can generate power by the rotation of the rotating shaft 90.

  During this time, the load Fd1 acts on the movable scroll 92 and the bush 95 in the tangential direction of the revolution circle C by the reaction of the action chamber 93. As shown in FIG. 7B, the load Fd1 is orthogonal to the parallel component force Fd1t (= e · Fd1 · cos θ) in the direction of the plane Lp connecting the drive axis Od and the revolution axis Oc, and the plane Lp. It can be divided into vertical component force Fd1n (= e · Fd1 · sin θ) in the direction of the plane Ln. For this reason, as shown in FIG. 7A, the vertical component force Fd1n of the bush 95 becomes a biasing force that presses the movable scroll 92 against the fixed scroll 91. For this reason, at this time, the working fluid in the working chamber 93 hardly leaks. In this case, since the rotating shaft 90 is effectively rotated by the pressure of the working fluid, high power generation efficiency is exhibited.

  However, when this scroll type fluid machine functions as a blower, as shown in FIG. 8A, the rotation shaft 90 is driven clockwise around the rotation axis Os by a motor or the like. For this reason, the bush 95 revolves along the revolution circle C around the revolution axis Oc. At the same time, the movable scroll 92 revolves along the revolution circle C around the revolution axis Oc. Thus, the working chamber 93 moves from the center side toward the outer peripheral side while expanding its volume, and the working fluid is blown in the working chamber 93, whereby the working fluid is circulated.

  At this time, a load Fd2 acts on the movable scroll 92 and the bush 95 in the direction opposite to that shown in FIG. In the case of functioning as a blower, a differential pressure (for example, 0.1 MPa) that exceeds the piping pressure loss may be generated. Since the differential pressure at this time is smaller than the differential pressure (for example, 3 MPa) when the scroll type fluid machine functions as an expander, the magnitude of the load Fd2 is smaller than the load Fd1. This load Fd2 can also be divided into a parallel component force Fd2t in the direction of the plane Lp and a vertical component force Fd2n in the direction of the plane Ln, as shown in FIG. 8B. The vertical component force Fd2n is an urging force for pulling the movable scroll 92 away from the fixed scroll 91. For this reason, at this time, the working fluid in the working chamber 93 is likely to leak. For this reason, it is difficult to obtain sufficient performance with the conventional scroll type fluid machine.

  On the other hand, in the scroll type fluid machine of the present invention, the movable scroll is urged toward the fixed scroll by the urging means. This urging means is a vertical perpendicular to the plane connecting the drive axis and the revolution axis among the loads acting in the tangential direction of the revolution circle at the time of revolution of the movable scroll when the scroll type fluid machine functions as a blower. Has an urging force exceeding the component force.

  For this reason, in this scroll type fluid machine, the resultant force of the vertical component force and the urging force of the urging means acts on the bush in the direction opposite to the rotation direction of the drive unit. For this reason, even when this scroll type fluid machine functions as a blower, the bush is biased by the resultant force so as to swing around the drive axis in the direction of pressing the movable scroll against the fixed scroll. For this reason, at this time, it is difficult for the working fluid in the working chamber to leak.

  Therefore, the scroll type fluid machine of the present invention can exhibit high performance when used as an expander or blower of Rankine cycle.

  The urging means can be provided between the rotating shaft and the bush, between the drive unit and the bush, between the bush and the movable scroll, or the like. As the biasing means, a spring, rubber or the like can be employed.

  The bush may integrally have a balancer that cancels out the imbalance during the revolving motion of the movable scroll. The biasing means is preferably provided between the rotating shaft and the balancer. In this case, the biasing means can be easily provided between the rotating shaft and the balancer facing each other, and the structure of the scroll type fluid machine can be simplified.

The Rankine cycle of the present invention includes a pump, a boiler, an expander, and a condenser, and circulates a working fluid.
The expander is the scroll type fluid machine (claim 3).

  The Rankine cycle of this invention can exhibit high performance by the effect of the said scroll type fluid machine.

The waste heat utilization apparatus of the present invention is a waste heat utilization apparatus provided with the Rankine cycle,
A motor generator capable of driving the rotating shaft of the scroll type fluid machine and generating electric power by the rotating shaft;
The scroll fluid machine and the motor generator are integrated with each other (claim 4).

  The waste heat utilization apparatus of this invention can exhibit high performance by the effect of the Rankine cycle. Further, the waste heat utilization apparatus of the present invention is capable of generating electric power by a scroll-type fluid machine and recovering energy in the form of electric power, driving a rotating shaft of the scroll-type fluid machine by the motor generator, and scrolling. The mold fluid machine can easily function as a blower. Furthermore, since the scroll-type fluid machine and the motor generator are integrated, the waste heat utilization apparatus of the present invention can realize excellent mountability on a vehicle or the like.

  The scroll type fluid machine of the present invention can exhibit high performance when used as an expander or blower of Rankine cycle. The Rankine cycle and waste heat utilization apparatus of the present invention can exhibit high performance.

It is a figure which shows the scroll type fluid machine of an Example by a cross section, showing the waste-heat utilization apparatus and Rankine cycle of an Example typically. It is a principal part enlarged plan view of the scroll type fluid machine of an Example. It is explanatory drawing of the principal part in connection with the scroll type fluid machine of an Example. FIG. 4A is an explanatory diagram of a main part at the time of expansion, and FIG. FIG. 4A is an explanatory diagram of a main part during blowing, and FIG. It is explanatory drawing of the principal part in connection with the conventional scroll type fluid machine. FIG. 1A is an explanatory diagram of a main part during expansion, and FIG. 1B is a vector diagram in relation to a conventional scroll type fluid machine. FIG. 1A is an explanatory diagram of a main part during blowing and FIG. 1B is a vector diagram relating to a conventional scroll type fluid machine.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the scroll type fluid machine of the embodiment includes a housing 10 including a front housing 12 and a rear housing 14. The front housing 12 has a bottomed cylindrical shape with an open rear end. The rear housing 14 has a lid shape that closes the rear end side of the front housing 12. A shaft support member 16 is provided in the front housing 12, and a fixed scroll 18 is provided behind the shaft support member 16. The front housing 12 and the rear housing 14 are housed in a state in which the shaft support member 16 and the fixed scroll 18 are in contact with each other, and the rear end of the front housing 12 and the front end of the rear housing 14 are abutted with each other, not shown. They are fixed to each other by bolts. An electric motor chamber 20 is formed in the front housing 12 in front of the shaft support member 16.

  A bearing boss 12a is formed in the center of the inner surface of the bottom wall of the front housing 12, and a bearing device 22 is provided on the bearing boss 12a. Further, the shaft support member 16 is provided with a shaft hole 16a, and a bearing device 24 and a shaft seal member 26 are provided in the shaft hole 16a. The rotary shaft 28 is rotatably supported by the bearing devices 22 and 24. That is, as shown in FIGS. 2 and 3, the rotation shaft 28 extends along the rotation axis Os and can rotate around the rotation axis Os.

  As shown in FIG. 1, a movable scroll 30 is provided between the fixed scroll 18 and the shaft support member 16. The fixed scroll 18 includes a fixed side end plate 18a and a fixed side spiral wall 18b raised integrally from the fixed side end plate 18a. An inflow chamber 44 is formed between the fixed side end plate 18a and the rear housing 14, and an inflow port 18c communicating with the inflow chamber 44 is provided through a central portion of the fixed side end plate 18a. The rear housing 14 is provided with an inflow port 14a that opens the inflow chamber 44 to the outside.

  The movable scroll 30 includes a movable side end plate 30a and a movable side spiral wall 30b raised up integrally from the movable side end plate 30a. The movable scroll 30 is disposed so as to face the fixed scroll 18, thereby forming a working chamber 32 whose volume can be changed between the movable scroll 30 and the fixed scroll 18. The shaft support member 16 is provided with an outflow port 16b communicating with the electric motor chamber 20, and a part of the periphery of the movable side end plate 30a can communicate with the outermost working chamber 32 and the outflow port 16b. ing.

  A boss 30 c is formed on the back surface of the movable side end plate 30 a of the movable scroll 30. The cylindrical inner peripheral surface of the boss 30c is a revolution surface 30d concentric with the revolution axis Oc. As shown in FIGS. 2 and 3, the rotation axis Os and the revolution axis Oc are separated by the revolution radius R.

  Further, as shown in FIG. 1, a pin 34 is integrally projected on the rotary shaft 28. As shown in FIGS. 2 and 3, the pin 34 extends along the drive axis Od. The rotation axis Os and the drive axis Od are separated by an eccentric distance e. The outer peripheral surface of the pin 34 is a cylindrical drive surface 34a concentric with the drive axis Od.

  As shown in FIG. 1, a cylindrical bush 36 and a bearing device 38 are provided between the pin 34 and the movable scroll 30. The bush 36 has a pin hole 36 a, and the inner peripheral surface of the pin hole 36 a is a cylindrical driven surface 36 b that fits with the drive surface 34 a of the pin 34. Further, as shown in FIGS. 2 and 3, the outer peripheral surface of the bush 36 is a revolution surface 36 c that fits with the revolution surface 30 d of the movable scroll 30 via the bearing device 38. The bush 36 is rotatably supported around the drive axis Od by fitting the drive surface 34a and the driven surface 36b. The bush 36 can revolve along the revolution circle C having the revolution radius R around the revolution axis Oc together with the movable scroll 30 by fitting the revolution surface 30d and the revolution surface 36c via the bearing device 38. Further, the bush 36 integrally has a balancer 40 that cancels an unbalance during the revolving motion of the movable scroll 30.

  As shown in FIG. 1, three or more restricting holes 42a are recessed in the rear surface side of the shaft support member 16, and a ring 42b is fitted in each restricting hole 42a. A pin 42c is fixed to the movable side end plate 30a of the movable scroll 30 so as to protrude into each ring 42b and to slidably contact the inner peripheral surface of each ring 42b. Each regulation hole 42a, each ring 42b, and each pin 42c constitutes a rotation prevention mechanism 42 that prevents the movable scroll 30 from rotating and rotating only.

  As shown in FIG. 2, a spring seat 28 a is formed at the rear end of the rotating shaft 28, and the spring seat 40 a is even formed at the front end of the balancer 40. The spring seats 28a and 40a are parallel to a plane Lp that connects the drive axis Od and the revolution axis Oc. A pressing spring 46 having an urging force Fs described later is provided between the spring seats 28a and 40a.

  The scroll fluid machine 50 is constituted by the housing 10, the shaft support member 16, the rotary shaft 28, the fixed scroll 18, the movable scroll 30, the pin 34, the bush 36, the balancer 40, the rotation prevention mechanism 42, the pressing spring 46, and the like.

  As shown in FIG. 1, a stator 62 is fixed to the inner peripheral surface of the front housing 12 in the motor chamber 20. A rotor 64 fixed to the rotating shaft 28 is provided inside the stator 62. The stator 62 is connected to a battery (not shown). An outlet 12b that opens the electric motor chamber 20 to the outside is provided through the bottom wall of the front housing 11 below the bearing boss 14. The motor generator 60 is constituted by the housing 10, the shaft support member 15, the rotating shaft 28, the rotor 64, the stator 62, and the like. The motor generator 60 can drive the rotary shaft 28 of the scroll type fluid machine 50 and can generate electric power with the rotary shaft 28.

  The scroll fluid machine 50 and the motor generator 60 are integrated into a single device 100. A condenser 104 is connected to the outlet 12 b of the apparatus 100 via a pipe 102. A pump 108 is connected to the condenser 104 via a pipe 106. A boiler 112 is connected to the pump 108 via a pipe 110. The boiler 112 is connected to the inlet 14a of the apparatus 100 through a pipe 114. The piping 102 and the like are filled with a refrigerant as a working fluid. A Rankine cycle 200 is configured by the device 100, the condenser 104, the pump 108, the boiler 112, the pipes 102, 106, 110, 114, and the like.

  The condenser 104 is provided with a fan 302 for air-cooling the refrigerant. The boiler 112 is connected to a pipe 304 through which, for example, cooling water for cooling the engine of the vehicle flows. The Rankine cycle 200, the fan 302, the pipe 304, and the like constitute a waste heat utilization device.

  In this waste heat utilization apparatus, in the Rankine cycle 200, the pump 108 pumps the refrigerant, and the boiler 112 heats the refrigerant with engine cooling water. Further, the apparatus 100 performs expansion and decompression of the refrigerant, and the condenser 104 cools the refrigerant.

  During this time, the scroll fluid machine 50 functions as an expander. In this case, the refrigerant heated by the boiler 112 flows into the inflow chamber 44 from the inflow port 14a and flows into the working chamber 32 on the center side from the inflow port 18c. Since this refrigerant has a high pressure, as shown in FIG. 3, the refrigerant is expanded and depressurized in the working chamber 32, and the working chamber 32 moves while increasing its volume from the center side toward the outer peripheral side. For this reason, the movable scroll 30 revolves along the revolution circle C around the revolution axis Oc. At the same time, as shown in FIG. 4A, the bush 36 revolves along the revolution circle C around the revolution axis Oc. For this reason, the rotating shaft 28 rotates in the clockwise direction in the drawing around the rotating axis Os. The rotor 64 of the motor generator 60 rotates in the stator 62 by the rotation of the rotating shaft 28, and power generation is performed.

  At this time, the load Fd1 acts on the movable scroll 30 and the bush 36 in the tangential direction of the revolution circle C by the reaction of the working chamber 32. As shown in FIG. 4B, the load Fd1 is orthogonal to the parallel component force Fd1t (= e · Fd1 · cos θ) in the direction of the plane Lp connecting the drive axis Od and the revolution axis Oc, and the plane Lp. It can be divided into vertical component force Fd1n (= e · Fd1 · sin θ) in the direction of the plane Ln.

  In the scroll type fluid machine 50, the movable scroll 30 is urged toward the fixed scroll 18 by the pressing spring 46. Since the spring seats 28a and 40a are parallel to the plane Lp, the pressing spring 46 applies an urging force Fs to the revolution axis Oc in the direction of the plane Ln. The urging force Fs is larger than the vertical component force Fd1n as shown in FIG.

  For this reason, the resultant force G of the vertical component force Fd1n and the urging force Fs of the pressing spring 46 acts on the revolution axis Oc in a direction opposite to the rotation direction of the pin 34. That is, the resultant force G becomes a biasing force that presses the movable scroll 30 against the fixed scroll 18. For this reason, at this time, the refrigerant in the working chamber 32 hardly leaks.

  For this reason, due to the boiler 112 shown in FIG. 1 heating the refrigerant by the cooling water of the engine, the rotary shaft 28 is effectively rotated by the pressure of the refrigerant. Therefore, high power generation efficiency is exhibited in motor generator 60. Thus, in this waste heat utilization apparatus, energy recovery based on waste heat can be effectively performed. Further, the boiler 112 cools the cooling water of the engine and maintains the engine with high performance.

  When the pump 108 fails, the apparatus 100 drives the rotating shaft 28 by the motor generator 60. As a result, as shown in FIG. 5A, the rotation shaft 28 is driven clockwise around the rotation axis Os in the drawing. For this reason, the bush 36 revolves along the revolution circle C around the revolution axis Oc. At the same time, the movable scroll 30 revolves along the revolution circle C around the revolution axis Oc. In this way, the working chamber 32 moves while increasing its volume from the center side toward the outer peripheral side, the refrigerant is blown in the working chamber 32, and the refrigerant is circulated. In this case, the scroll type fluid machine 50 functions as a blower. Thus, in this waste heat utilization apparatus, it is possible to ensure cooling of the engine when the pump 108 fails.

  At this time, the load Fe2 acts on the pin 34 as a reaction. For this reason, the load Fd2 acts on the movable scroll 30 and the bush 36 in the direction opposite to that shown in FIG. In the case of functioning as a blower, a differential pressure (for example, 0.1 MPa) that exceeds the piping pressure loss may be generated. Since the differential pressure at this time is smaller than the differential pressure (for example, 3 MPa) when the scroll type fluid machine 50 functions as an expander, the magnitude of the load Fd2 is smaller than the load Fd1. This load Fd2 can also be divided into a parallel component force Fd2t in the direction of the plane Lp and a vertical component force Fd2n in the direction of the plane Ln, as shown in FIG. In this scroll type fluid machine 50, the movable scroll 30 is urged toward the fixed scroll 18 by the urging force Fs of the pressing spring 46.

  Since the urging force Fs is larger than the vertical component force Fd2n, the resultant force G of the vertical component force Fd2n and the urging force Fs of the pressing spring 46 acts on the bush 36 in the direction opposite to the rotation direction of the pin 34. For this reason, even when the scroll fluid machine 50 functions as a blower, the resultant force G is urged in a direction in which the movable scroll 30 is pressed against the fixed scroll 18. For this reason, at this time, it is difficult for the refrigerant in the working chamber 32 to leak.

  Therefore, the scroll type fluid machine 50 according to the embodiment can exhibit high performance when used as an expander or blower of the Rankine cycle 200. And the Rankine cycle 200 of an Example can exhibit high performance with the effect of the said scroll type fluid machine 50. FIG.

  In this scroll type fluid machine 50, the bush 36 has a balancer 40 integrally, and a pressing spring 46 is provided between the rotary shaft 28 and the balancer 40. For this reason, the pressing spring 46 can be easily provided between the rotating shaft 28 and the balancer 40 facing each other, and the structure of the scroll type fluid machine 50 can be simplified.

  Moreover, the waste heat utilization apparatus of an Example can exhibit high performance with the effect of the said Rankine cycle 200. FIG. Further, in the waste heat utilization apparatus of the embodiment, the scroll fluid machine 50 can generate the motor generator 60 to recover the energy in the form of electric power, and the rotation shaft 28 of the scroll fluid machine 50 can be recovered by the motor generator 60. And the scroll type fluid machine 50 can easily function as a blower. Furthermore, since the scroll type fluid machine 50 and the motor generator 60 are integrated in the waste heat utilization apparatus of the embodiment, it is possible to realize excellent mountability on a vehicle.

  While the present invention has been described with reference to the embodiments, it is needless to say that the present invention is not limited to the above-described embodiments and can be appropriately modified and applied without departing from the spirit thereof.

  For example, the heat source of the boiler 112 is not limited to engine cooling water, and pressurized air that has passed through a supercharger, reflux exhaust before being supplied to the engine, or the like can be employed.

  The drive unit is not limited to a pin that is formed on the rotating shaft and fits into the pin hole of the bush, but may be a pin that is formed on the bush and fits into the pin hole of the rotating shaft.

  The present invention is applicable to vehicles and the like.

Os ... rotation axis 28 ... rotation shaft 18a ... fixed side end plate 18b ... fixed side spiral wall 18 ... fixed scroll 30a ... movable side end plate 30b ... movable side spiral wall 32 ... working chamber R ... revolution radius Oc ... revolution axis 30d ... Revolved surface 30 ... movable scroll e ... eccentric distance Od ... drive axis 34a ... drive surface 34 ... drive unit (pin)
36b ... Drive surface 36c ... Revolution surface C ... Revolution circle 36 ... Bush 50 ... Scroll type fluid machine Fd1, Fd2 ... Load acting in the tangential direction of the revolution circle during the revolution of the movable scroll Lp ... Connect the drive axis to the revolution axis Flat surface Fd1n, Fd2n ... Vertical component force Fs ... Biasing force 46 ... Biasing means (pressing spring)
40 ... balancer 108 ... pump 112 ... boiler 100 ... expander, blower (device)
104 ... Condenser 200 ... Rankine cycle 60 ... Motor generator

Claims (4)

A rotation axis extending along the rotation axis and rotatable about the rotation axis;
A fixed scroll having a fixed spiral wall formed on the fixed end plate;
A movable-side spiral wall is formed on the movable-side end plate, and a working chamber whose volume can be changed is formed between the movable scroll and the fixed scroll, and a revolving radius from the rotation axis A movable scroll formed with a revolving surface concentric with a revolving axis separated by a distance,
A drive unit that is supported by the rotary shaft and extends along a drive axis that is separated from the rotary axis by an eccentric distance, and has a drive surface concentric with the drive axis;
A driving surface provided between the driving unit and the movable scroll, and having a driven surface that fits the driving surface and a revolving surface that fits the revolving surface; the driving surface and the driven surface; And can be revolved along the revolution circle of the revolution radius around the revolution axis together with the movable scroll by fitting between the revolving surface and the revolution surface. In a scroll type fluid machine having a bush,
The movable scroll is a plane that connects the drive axis and the revolution axis among loads acting in the tangential direction of the revolution circle when the scroll is revolving when the scroll fluid machine functions as a blower. A scroll type fluid machine that is biased toward the fixed scroll by a biasing means having a biasing force exceeding a vertical component force orthogonal to the fixed scroll. The bush integrally has a balancer that cancels an unbalance during the revolving motion of the movable scroll,
The scroll type fluid machine according to claim 1, wherein the urging means is provided between the rotating shaft and the balancer. In the Rankine cycle which has a pump, a boiler, an expander and a condenser and circulates a working fluid,
The Rankine cycle characterized in that the expander is a scroll type fluid machine according to claim 1 or 2. A waste heat utilization apparatus comprising the Rankine cycle according to claim 3,
A motor generator capable of driving the rotating shaft of the scroll type fluid machine and generating electric power by the rotating shaft;
A waste heat utilization apparatus, wherein the scroll type fluid machine and the motor generator are integrated.

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