JP2007170285A - Scroll fluid machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the size and the weight of a scroll fluid machine. <P>SOLUTION: A crankshaft 32 is installed in a rotating shaft 12. A swing scroll 33 is rotatably connected to the crankshaft 32. A lap part 46 of a fixed scroll 34 is engaged with a lap part 40 of the swing scroll 33. The movement of the swing scroll 33 is restricted by a restricting member 52 so that the swing scroll 33 swings and revolves about the fixed scroll 34 without rotating around its axis. The restricting member 52 is provided with an engaging portion 54 engaged with the swing scroll 33. The swing scroll 33 is provided with a balancer 51 which projects from a platform of a bed plate 38, and achieves balance by aligning the gravity center of the swing scroll 33 to the axial center O3 of the crankshaft 32. The portion 56 to be engaged with the engaging portion 54 is formed by the balancer 51. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a scroll type fluid machine.

Patent Document 1 below discloses a scroll type fluid machine used as a compressor. This scroll type fluid machine forms a crankshaft having an eccentric shaft center at a tip of a drive shaft of a motor, a swing scroll is rotatably connected to the crankshaft, and the fixed scroll is faced to the swing scroll. Is arranged. The orbiting scroll and the fixed scroll are formed by projecting a spiral wrap portion on the surface of a disk-shaped base plate, and by engaging each other's lap portion, the space formed between the wrap portions is used as a compression chamber. Yes.
A regulating member for regulating the movement of the orbiting scroll is provided on the back surface of the orbiting scroll. The restricting member restricts the movement so that the swinging scroll swings around the axis of the drive shaft without rotating with respect to the fixed scroll. The restricting member is formed in a ring shape, and an engaging protrusion that engages with the back surface of the orbiting scroll is formed on one surface, and an engaging protrusion that engages with the frame of the scroll type fluid machine on the other surface. Is forming.
Japanese Patent Publication No. 6-15869

  In the above scroll type fluid machine, the swing scroll is swung with respect to the fixed scroll. Therefore, in order to keep the centrifugal force constant, the center of gravity of the swing scroll coincides with the axis of the crankshaft. I have to let it. The wrap portion of the orbiting scroll is a spiral type composed of an involute curve, and the center of gravity cannot always coincide with the crankshaft. Therefore, in order to compensate for the deviation between the crankshaft center and the center of gravity of the lap portion, conventionally, the base plate is largely decentered on the side opposite to the eccentric side of the center of gravity of the lap portion with respect to the crankshaft center.

  However, since the base plate is the maximum outer shape portion of the orbiting scroll, it is necessary to enlarge the casing for storing the orbiting scroll by greatly decentering the base plate, which increases the size of the entire fluid machine. There was a problem.

  On the other hand, the restricting member restricts the motion of the orbiting scroll by engaging the engaging protrusion with a groove formed by carving the base plate of the orbiting scroll. In order to form such a groove, the base plate of the orbiting scroll needs to have a certain thickness, which causes an increase in the weight of the machine.

  Accordingly, an object of the present invention is to solve the above problems and to reduce the size and weight of a scroll type fluid machine.

  The invention according to claim 1 is a rotating shaft, a crankshaft provided on the rotating shaft and having a shaft center parallel to and eccentric from the shaft center of the rotating shaft, and a base plate rotatably connected to the crankshaft. And a scroll having a spiral wrap provided on the base plate, a fixed scroll having a spiral wrap disposed facing the swing scroll and meshing with the wrap, and the swing A scroll-type fluid machine comprising: a regulating member that regulates the movement of the orbiting scroll so that the moving scroll orbits around the axis of the rotary shaft with respect to the fixed scroll without rotating. The regulating member includes an engaging portion that engages with the swing scroll, and the swing scroll projects from the plate surface of the base plate and overlaps the swing scroll. The includes a balancer to balance to match the axis of the crankshaft, the balancer, characterized in that it constitutes a engaged portion for engaging the engaging portion.

  According to a second aspect of the present invention, in the first aspect of the present invention, the center of gravity of the wrap portion of the orbiting scroll is arranged eccentrically with respect to the axis of the crankshaft, and the center of gravity of the balancer and the platform The center of gravity of the plate compensates for the eccentricity of the center of gravity of the lap portion with respect to the axis of the crankshaft, and the center of gravity of the entire swing scroll coincides with the axis of the crankshaft. It is characterized by being arranged eccentrically.

  According to the first aspect of the present invention, since the balancer is provided on the base plate of the orbiting scroll, the center of the entire orbiting scroll is required to be aligned with the axis of the crankshaft. The amount of eccentricity of the base plate can be reduced or eliminated. Therefore, it is not necessary to enlarge the casing that houses the orbiting scroll, and the scroll fluid machine can be downsized.

  In addition, since the balancer is formed so as to protrude from the base plate, it can be configured as an engaged portion with which the engaging portion of the restricting member is engaged. Simplification can be achieved. Further, since it is not necessary to form a groove for engaging the engaging portion in the base plate as in the prior art, there is no need to make the entire base plate thicker, and the weight of the orbiting scroll can be reduced. The weight of the machine can be reduced.

  According to the invention of claim 2, since the center of gravity of the base plate is eccentric with respect to the axis of the crankshaft, the base plate itself functions as a kind of balancer. Weight can be reduced. Therefore, considering the balance between the amount of eccentricity of the base plate and the weight of the balancer, it is possible to suitably achieve both a reduction in size and weight of the scroll fluid machine.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a scroll type fluid machine according to an embodiment of the present invention. The scroll fluid machine 1 includes a rotary shaft 12, a crankshaft 32, a housing (bearing housing) 31, a swing scroll 33, a fixed scroll 34, a thrust bearing 35, and the like. The rotating shaft 12 is rotatably supported by a housing 31 via a bearing 36, and a crankshaft 32 is formed at the end of the rotating shaft 12 disposed in the housing 31. An axis O3 of the crankshaft 32 is parallel to and eccentric from the axis O2 of the rotary shaft 12.

  The orbiting scroll 33 has a cylindrical boss portion 39 projecting in the direction of the axis O3 on one plate surface of a disk-shaped base plate 38, and a spiral wrap portion 40 having an involute curve on the other plate surface. Projecting in the direction of the axis O3. The boss portion 39 is rotatably supported on the crankshaft 32 via a bearing 41 fitted on the inner peripheral side thereof.

  The fixed scroll 34 is disposed on the opposite side of the housing 31 with the swing scroll 33 interposed therebetween, and swings from the outer wall portion 43 facing the front end surface of the lap portion 40 of the swing scroll 33 and the outer peripheral portion of the outer wall portion 43. The peripheral wall portion 44 is bent and extends toward the scroll 33, and the flange portion 45 extends radially outward from the end portion of the peripheral wall portion 44. On the radially inner side of the peripheral wall portion 44, a spiral wrap portion 46 that protrudes from the outer wall portion 43 toward the swing scroll 33 is formed. The wrap portion 46 meshes with the wrap portion 40 of the orbiting scroll 33, and the front end surface faces the base plate 38. Thereby, a plurality of chambers 47 (expansion chambers or compression chambers) are formed between the swing scroll 33 and the fixed scroll 34.

  A fluid first circulation port 61 is formed through substantially the center of the outer wall portion 43 of the fixed scroll 34. Similarly, a fluid second circulation port 62 is formed in the outer peripheral portion of the outer wall portion 43. ing.

  A flange portion 48 is provided on the outer peripheral portion of the housing 31. The flange portion 48 and the flange portion 45 of the fixed scroll 34 are connected by a bolt 49 with the outer peripheral portion of the thrust bearing 35 interposed therebetween. The thrust bearing 35 has a ring shape, and the inner peripheral portion of the thrust bearing 35 is slidably in contact with the back surface (surface on the boss portion 39 side) of the base plate 38 of the swing scroll 33.

  The swing scroll 33 is shaped so that the center of gravity is disposed on the axis O3 of the crankshaft 32. 2 is a cross-sectional view taken along the line II-II in FIG. 1 showing the orbiting scroll 33. A point A in the figure indicates the position of the center of gravity of the wrap portion 40, and a point B indicates the position of the center of gravity of the base plate 38. ing. The center of gravity A of the wrap portion 40 is arranged eccentrically with respect to the axis O3.

  The center of gravity B of the base plate 38 is on a line L1 connecting the axis O3 of the crankshaft 32 and the center of gravity A of the lap portion 40, and is disposed on the opposite side of the center of gravity A of the lap portion 40 with the axis O3 interposed therebetween. Has been. As a result, the center of gravity of the entire swing scroll 33 approaches the axis O3. Further, a balancer 51 is provided on the base plate 38 in order to compensate for the eccentricity of the center of gravity B that is not sufficient to place the center of gravity of the entire swing scroll 33 on the axis O3 of the crankshaft 32.

  The balancer 51 is formed in a shape in which the base plate 38 is partially thickened in an arc shape centered on the axis O <b> 3 of the crankshaft 32 and protrudes from the base plate 38. The balancer 51 is arranged such that its center of gravity C is on the line L1 and opposite to the center of gravity A of the wrap portion 40 with the axis O3 interposed therebetween. Further, the center of gravity C of the balancer 51 is disposed on the outer side in the radial direction than the center of gravity B of the base plate 38. With such an arrangement of the wrap portion 40, the base plate 38, and the balancer 51, the center of gravity of the entire swing scroll 33 is arranged on the axis O <b> 3 of the crankshaft 32.

  As shown in FIG. 1, a regulating member (joint member) 52 is provided on the back side of the base plate 38 of the swing scroll 33. The regulating member 52 regulates the movement of the orbiting scroll 33 so that the orbiting scroll 33 rotates and orbits around the axis O2 with respect to the fixed scroll 34 without rotating.

  FIG. 3 is a perspective view showing the swing scroll 33 and the regulating member 52. The restricting member 52 includes a ring-shaped annular portion 53 and engaging portions 54 and 55 protruding from each side surface of the annular portion 53. Two engaging portions 54 are provided on one side surface of the annular portion 53 at intervals of 180 °. Two engaging portions 55 are provided on the other side surface at an interval of 180 °, and the engaging portions 55 are arranged 90 ° out of phase with respect to the engaging portion 54 on one side surface.

  The two engaging portions 54 protruding toward the swing scroll 33 are engaged with two engaged portions 56 formed on the base plate 38, respectively. Each engaged portion 56 includes a pair of engaged pieces 56a and 56a that protrude from the base plate 38 so as to sandwich each engaging portion 54 from both sides in the circumferential direction. One engaged piece 56 a of one (lower side in FIG. 3) is constituted by the balancer 51, and the engaging part 54 is engaged with the end of the balancer 51. ing.

  As shown in FIG. 1, a ring member 57 is fitted in the housing 31 on the outer peripheral side of the crankshaft 32, and the ring member 57 protrudes to the anti-oscillating scroll 33 side of the regulating member 52. An engaged groove 57A extending in the radial direction in which the two engaging portions 55 engage is formed. In FIG. 1, for easy understanding, the engaging portion 54 on one side of the annular portion 53 and the engaging portion 55 on the other side are shown on the same plane with a phase difference of 180 °. Actually, the relationship is 90 ° out of phase as shown in FIG.

  The regulating member 52 is movable in the radial direction along the engaged groove 57 </ b> A of the ring member 57. Further, the orbiting scroll 33 is movable in a direction orthogonal to the direction in which the restricting member 52 is movable. Therefore, the orbiting scroll 33 does not rotate and can orbit (revolve) around the axis O2 of the rotary shaft 12 with respect to the fixed scroll 34.

(Usage form of scroll type fluid machine)
FIG. 4 is a block diagram showing an example in which the fluid machine 1 is applied to the Rankine cycle power generation device 2 as one of the usage forms of the scroll type fluid machine 1. In this case, the fluid machine 1 constitutes an expander. The power generator 2 includes a steam generator 21, a generator 22, an expander (scroll fluid machine) 1, a condenser 23, a condensate pump 24, and working medium passages 25A to 25C. The passages 25A and 25B indicated by dotted lines indicate a case where the working medium is in a gas (gas phase) state or a gas and liquid (liquid phase) state, and the passage 25C indicated by a solid line indicates that the working medium is liquid. The case of the state is shown.

  The generator 22 is directly or indirectly connected to the output shaft (rotary shaft) 12 (FIG. 1) of the expander 1. The expander 1 is operated by steam (working medium) supplied from the steam generator 21 via the passage 25 </ b> A, and drives the generator 22. The working medium that has passed through the expander 1 is supplied to the condenser 23 through the passage 25B, is condensed by the cooling water, and becomes a liquid. Further, the working medium is supplied from the condenser 23 through the passage 25C to the steam generator 21 by the condensate pump 24, and is evaporated by the hot gas in the steam generator 21. By repeating this cycle, power is generated by the generator 1.

  FIG. 5 is an explanatory view showing an operating state when the scroll type fluid machine 1 is used as an expander as described above. A plurality of expansion chambers are formed between the wrap portion 40 of the swing scroll 33 and the wrap portion 46 of the fixed scroll 34. First, in FIG. 5 (1), the working fluid vapor flows into the scroll type fluid machine 1 from the central first circulation port 61 into the central first expansion chamber 47 </ b> A. In (2), the first expansion chamber 47A expands due to the pressure of the steam, and the orbiting scroll 33 starts to orbit around the axis O2 (FIG. 4) of the rotating shaft 12, thereby causing the crankshaft 32 ( The rotating shaft 12 rotates via FIG. In (3), the first expansion chamber 47A further expands, and a new expansion chamber (second expansion chamber) 47B is formed on the center side. The second expansion chamber 47B continues from the first flow port 61 to the second expansion chamber 47B. Steam flows in. Thereafter, in (4) and (5), the first and second expansion chambers 47A and 47B are enlarged, and the swing scroll 33 swings and swings. In (6), the outer periphery of the lap portion 40 of the swing scroll 33 When the end is away from the lap portion 46 of the fixed scroll 34, the first expansion chamber 47A is opened, and the steam is exhausted. The exhausted steam is discharged to the outside from the second circulation port 62 shown in FIG.

  When the scroll fluid machine 1 is used as a compressor, the second circulation port 62 serves as a fluid inlet, and the first circulation port 61 serves as a fluid outlet. Then, the rotating shaft 12 is rotated by a driving device such as a motor, the swinging scroll 33 is swung and swirled, the fluid is sucked into the compression chamber 47 from the second flow port 62, and the first fluid in the center is compressed while compressing the fluid. It discharges from the distribution port 61.

[Effects of this embodiment]
With the configuration described in detail above, the present embodiment provides the following operational effects.
(1) As shown in FIG. 2, since the balancer 51 is formed on the back surface of the base plate 38 of the orbiting scroll 33, the eccentric amount of the center of gravity B of the base plate 38 with respect to the axis O3 of the crankshaft 32 can be set as much as possible. The center of gravity of the orbiting scroll 33 can be made coincident with the axis O3 of the crankshaft 32 by reducing the size. Therefore, the outer shape of the casing 31 that houses the orbiting scroll 33 (base plate 38) can be made as small as possible, and the scroll fluid machine 1 can be downsized.

  In order to make the center of gravity of the orbiting scroll 33 coincide with the axis O3 of the crankshaft 32, for example, the position of the center of gravity B of the base plate 38 coincides with the axis O3 of the crankshaft 32 and the axis of the crankshaft 32 is reached. It is also conceivable that only the balancer 51 compensates for the eccentricity of the center of gravity A of the lap portion 40 with respect to O3. In this case, the orbiting scroll 33 can be made smaller, but the balancer 51 needs to be larger and heavier than in the present embodiment. Considering this point, in the present embodiment, the eccentricity of the center of gravity A of the lap portion 40 with respect to the axis O3 of the crankshaft 32 is compensated by the eccentricity of both the balancer 51 and the base plate 38. The center of gravity of the entire orbiting scroll 33 can be made to coincide with the crankshaft center O3 without having to increase the height and weight so much and without increasing the eccentric amount of the base plate 38 so much. Accordingly, it is possible to suitably achieve both a reduction in size and weight of the scroll type fluid machine.

  (2) Since the balancer 51 formed on the orbiting scroll 33 is also used as the engaged portion 56 with respect to the regulating member 52, the structure can be simplified as compared with the case where a separate engaged portion is formed. it can. Moreover, since the base plate 38 itself can be made thinner than in the case of forming a groove in the base plate as in the prior art, the weight can be reduced.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and can be appropriately modified as follows, for example.
(1) As shown in FIG. 2, the center of gravity B of the base plate 38 and the center of gravity C of the balancer 51 are arranged on a line L1 connecting the axis O3 of the crankshaft 32 and the center of gravity A of the lap portion 40. As long as the center of gravity of the entire orbiting scroll 33 is disposed on the crankshaft O3, it does not necessarily have to be on the line L1.

  (2) The crankshaft 32 can be formed in a cylindrical shape. In this case, a pin can be formed on the base plate 38 in place of the boss portion 39, and the pin can be inserted into a cylinder of the crankshaft 32 via a bearing and rotatably connected.

  (3) The balancer 51 can be integrally formed of the same material as the base plate 38, or a separate body of the same or different material can be fixed to the base plate 38.

  The present invention can be used for an expander of a Rankine cycle power generation device, a compressor of various air conditioners, and the like.

It is a longitudinal cross-sectional view of a scroll type fluid apparatus. It is the II-II arrow line view of FIG. 1 which shows rocking scroll. It is a perspective view of a rocking scroll and a regulating member. It is a block diagram which shows the example which applied the fluid machine to the Rankine cycle power generation device. It is explanatory drawing which shows the operating state of the scroll-type fluid apparatus at the time of using a fluid machine as an expander.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Scroll type fluid machine 12 Rotating shaft 32 Crankshaft 33 Rocking scroll 34 Fixed scroll 38 Base plate 40 Lap part 46 Lap part 52 Restriction member 54 Engagement part

Claims (2)

A rotating shaft; a crankshaft provided on the rotating shaft and having a shaft center parallel to and eccentric from the axis of the rotating shaft; a base plate rotatably connected to the crankshaft; and the base plate A swing scroll having a spiral wrap portion, a fixed scroll having a spiral wrap portion facing the swing scroll and meshing with the wrap portion, and the swing scroll without rotating. In a scroll type fluid machine comprising: a regulating member that regulates the movement of the orbiting scroll so as to orbit around the axis of the rotary shaft with respect to the fixed scroll.
The regulating member includes an engaging portion that engages with the orbiting scroll;
The orbiting scroll includes a balancer that projects from the plate surface of the base plate and balances the center of gravity of the orbiting scroll so as to coincide with the axis of the crankshaft;
The scroll fluid machine according to claim 1, wherein the balancer constitutes an engaged portion that engages with the engaging portion. The center of gravity of the lap portion of the orbiting scroll is arranged eccentrically with respect to the axis of the crankshaft,
The center of gravity of the balancer and the center of gravity of the base plate compensate for the eccentricity of the center of gravity of the wrap portion with respect to the axis of the crankshaft so that the center of gravity of the entire swing scroll coincides with the axis of the crankshaft. The scroll type fluid machine according to claim 1, wherein the scroll type fluid machine is arranged eccentrically with respect to an axis of the crankshaft.

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