JP4252659B2 - Scroll type fluid machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a scroll fluid machine suitable for use in an air compressor, a vacuum pump, or the like.
[0002]
[Prior art]
  In general, a scroll type fluid machine includes a casing, a fixed scroll provided on the casing and having a spiral wrap portion standing on an end plate, a drive shaft rotatably provided on the casing, and a casing in the casing. A revolving scroll provided on the front end side of the drive shaft via a revolving bearing and having a wrap portion standing on the end plate that overlaps with the wrap portion of the fixed scroll and defines a plurality of compression chambers. Is known (JP-A-2-248675, etc.).
[0003]
  This type of conventional scroll type fluid machine has a suction port provided on the outer peripheral side of the fixed scroll by rotationally driving the drive shaft from the outside and rotating the orbiting scroll with a fixed eccentric dimension with respect to the fixed scroll. The fluid is sucked in from the air, and the fluid is sequentially compressed in each compression chamber between the fixed scroll wrap portion and the orbiting scroll wrap portion, and the compressed fluid is discharged from the discharge port provided in the center portion of the fixed scroll. Discharge toward
[0004]
  Further, in this prior art, a thrust receiver serving as a bearing portion for supporting a thrust load acting on the orbiting scroll is provided on the back side of the orbiting scroll, and the behavior of the orbiting scroll during compression operation is provided by this thrust receiver. The structure is stabilized. Further, a disk-shaped oil scraper is integrally provided on the drive shaft, and the oil liquid scraped up by the oil scraping is supplied to, for example, an oil supply portion such as a swivel bearing between the back side of the orbiting scroll and the thrust receiver. Thus, the lubricity of these oil supply parts is increased.
[0005]
[Problems to be solved by the invention]
  Meanwhile, the above-described scroll type fluid machine according to the prior art supports the thrust load acting on the orbiting scroll by the thrust receiver, and slides the oil contained in the casing by oil scraping between the back side of the orbiting scroll and the thrust receiver. Supplying between the contact surfaces, the lubricity of each sliding contact surface is increased.
[0006]
  However, even if oil is supplied between the back side of the orbiting scroll and the thrust receiver in this way, if the thrust force acting on the orbiting scroll, for example, increases during the compression operation, the oil between the orbiting scroll and the thrust receiver is increased. There is a problem that the liquid is insufficient and the sliding wear generated between the two cannot be sufficiently suppressed, and the durability and life of these orbiting scrolls and thrust receivers are reduced.
[0007]
  The present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to provide a sliding contact surface between the back side of the orbiting scroll and the thrust receiver, even if the thrust load acting on the orbiting scroll is increased. Providing a scroll fluid machine that can always reduce sliding resistance, improve the wear resistance and life of these orbiting scrolls and thrust receivers, and improve device performance and reliability. To doInThe
[0008]
[Means for Solving the Problems]
  In order to solve the above-described problems, a scroll type fluid machine according to the present invention is provided with a casing, a fixed scroll provided with a spiral wrap portion on the end plate, and rotatably provided on the casing. A drive shaft and a wrap portion provided on the front end side of the drive shaft in the casing so as to be pivotable via a swivel bearing and overlapping a lap portion of the fixed scroll on the end plate so as to define a plurality of compression chambers. In order to support a thrust load acting on the orbiting scroll, a thrust receiver is provided on the casing and is in sliding contact with the back side of the orbiting scroll.
[0009]
  A feature of the configuration adopted by the invention of claim 1 is that the oil supply pump is provided between an oil supply pump that sucks and discharges the oil contained in the casing in a pressurized state, and the back side of the orbiting scroll and the thrust receiver. A hydrostatic bearing that allows pressurized oil discharged from a pump to act as back pressure on the orbiting scroll.The hydrostatic bearing portion is formed on either one of the sliding contact surfaces of the sliding scroll between the rear surface side and the thrust receiver and extends in the circumferential direction between the orbiting scroll and the thrust receiver. The oil pump is provided between both ends of the annular groove, and the annular groove is an opening through which pressurized oil discharged from the oil pump is supplied. And having a configurationThat is.
[0010]
  With this configuration, when the oil pump is operated during the compression operation, the oil in the casing is sucked into the oil pump and pressurized, so that the space between the back side of the orbiting scroll and the thrust receiver is increased. The hydrostatic bearing is supplied with pressurized oil from an oil supply pump.That is, between the sliding contact surfaces of the orbiting scroll and the thrust receiver, the pressurized oil from the oil pump is evenly guided along the circumferential direction of the orbiting scroll by the annular groove. The back pressure can be applied almost uniformly to the entire scroll, and the sliding characteristics with respect to the thrust receiver can be enhanced.
[0011]
  As a result, the pressurized oil supplied to the hydrostatic bearing portion acts as a back pressure on the orbiting scroll, and can be pressed in the direction of separating the orbiting scroll from the thrust receiver against the thrust load acting on the orbiting scroll. The pressurized oil in the hydrostatic bearing portion can keep the sliding contact surface between the back side of the orbiting scroll and the thrust receiver in a lubricated state.
[0012]
  The invention of claim 2according to,The casing is provided with a suction passage that sucks oil into the oil pump.Orbiting scrollHas an oil supply passage through which pressurized oil flows from the oil supply pump to the hydrostatic bearing.ConstitutionWhenis doing. ThisThe oil supply pump can smoothly supply the pressurized oil to the hydrostatic bearing portion through the oil supply passage while sucking and pressurizing the oil in the casing from the suction passage. AndBetween the sliding contact surfaces of the orbiting scroll and the thrust receiver, the pressurized oil from the oil pump is evenly guided by the annular groove along the circumferential direction of the orbiting scroll. It is possible to apply a back pressure almost evenly to the sliding bearing and improve the sliding characteristics with respect to the thrust receiver.
[0013]
  According to a third aspect of the present invention, the annular groove comprises a plurality of arcuate grooves extending concentrically between the back side of the orbiting scroll and the thrust receiver, and pressure is applied between the arcuate grooves. It is configured to form a passage through which oil flows. In this case, pressurized oil from the oil supply pump can be supplied to each of the plurality of arc-shaped grooves, and a more stable back pressure can be applied to the orbiting scroll by increasing the number of arc-shaped grooves.
[0014]
  Further, the invention of claim 4 is such that the oil pump is provided between the orbiting scroll and the thrust receiver and is operated following the movement of the orbiting scroll.SalaryPressurized oil from oil pumpPayOil passageTo supplyThe configuration is as follows.
[0015]
  As a result, the oil pump can be disposed on the opposite side of the compression chamber with the end plate of the orbiting scroll interposed therebetween, and the pressurized oil discharged from the oil pump can be prevented from leaking to the compression chamber side. And the pressurized oil from this oil supply pump can be smoothly supplied to the annular groove through the oil supply passage.
[0016]
  Furthermore, in the invention of claim 5, the oil supply passage is constituted by an oil passage extending in the radial direction of the orbiting scroll and having one end opened on the discharge side of the oil pump and the other end opened in the middle of the annular groove. Thereby, since the oil supply passage is arranged along the radial direction of the orbiting scroll, the orbiting scroll can be efficiently cooled while the pressurized oil from the oil supply pump flows in the oil supply passage.
[0017]
  On the other hand, the invention of claim 6according to,The oil supply passage isThe oil pumpAnd in the middle of the annular groove,In the casingPressurized oilReflux passage for refluxCommunicate withThe configuration is as follows. Thereby, a part of the pressurized oil discharged from the oil supply pump is sequentially returned into the casing through the reflux passage, and the slewing bearing and the like can be continuously lubricated during this period.
[0018]
  The invention of claim 7The fixed scroll and theOrbiting scrollA seal member is provided between the sliding contact surfaceConstitutionWhenis doing.
[0019]
  With this configuration,The fixed scroll and theOrbiting scrollBlocks intrusion of lubricating oil between sliding surfacescan do.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, a scroll type air compressor will be described as an example of a scroll type fluid machine according to an embodiment of the present invention, and will be described in detail with reference to the accompanying drawings.
[0021]
  Here, FIG. 1 to FIG. 10 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a bottomed cylindrical casing that forms an outer frame of a scroll type air compressor. The casing 1 is formed from an annular bottom 1A and an outer peripheral side of the bottom 1A to a fixed scroll 3 described later. It is comprised by the cylinder part 1B extended toward the direction, and the bearing part 1C protrudingly provided by the inner peripheral side of the said bottom part 1A, The lubricating oil 2 as an oil liquid is accommodated in the inside.
[0022]
  Reference numeral 3 denotes a fixed scroll fixed to the front end side of the casing 1, and the fixed scroll 3 is formed in a substantially disc shape as shown in FIG. 1 and is arranged so that its center coincides with an axis of a drive shaft 4 described later. The end plate 3A, a spiral wrap portion 3B standing on the surface of the end plate 3A, a tube portion 3C protruding in the axial direction so as to surround the wrap portion 3B from the outer peripheral side of the end plate 3A, and the tube The flange portion 3D protrudes radially outward from the outer peripheral side of the portion 3C and is attached to a thrust receiver 13 which will be described later.
[0023]
  A drive shaft 4 is rotatably supported in the casing 1 by bearings 5 and 6. The drive shaft 4 is connected to a drive source (not shown) on the base end side, and a crank 4A on the front end side. It extends into the casing 1. The crank shaft 4 </ b> A of the drive shaft 4 is eccentric with respect to the axis of the drive shaft 4 by a dimension δ.
[0024]
  7 is a balance weight provided on the outer peripheral side of the drive shaft 4 between the bearing portion 1C of the casing 1 and a boss portion 8C of the orbiting scroll 8 which will be described later. It protrudes outward in the direction, and balances the rotation of the drive shaft 4 with respect to the orbiting scroll 8.
[0025]
  Reference numeral 8 denotes a orbiting scroll provided in the casing 1 so as to be opposed to the fixed scroll 3. The orbiting scroll 8 includes an end plate 8A formed in a disk shape and an axial direction from the surface side of the end plate 8A. It is generally constituted by a spiral wrap portion 8B that is erected.
[0026]
  Further, the orbiting scroll 8 has a boss portion 8C protruding from the center of the rear surface side of the end plate 8A, and the boss portion 8C is rotatably attached to the crank 4A of the drive shaft 4 using the orbiting bearing 9. The front surface of the end plate 8A is in sliding contact with the flange portion 3D of the fixed scroll 3, and the back surface (back surface) is a sliding surface 8D that is in sliding contact with a thrust receiver 13 described later.
[0027]
  The orbiting scroll 8 is disposed so as to overlap the wrap portion 3B of the fixed scroll 3 by, for example, 180 degrees, and a plurality of compression chambers 10, 10,... Are defined between the wrap portions 3B, 8B. Made. During the operation of the scroll type air compressor, the air is sucked into the compression chamber 10 on the outer peripheral side from the suction port 11 provided on the outer peripheral side of the fixed scroll 3, and while the orbiting scroll 8 performs the revolving motion, The compressed air is sequentially compressed in the compression chamber 10, and finally, compressed air is discharged from the central compression chamber 10 to the outside through the discharge port 12 provided at the center of the fixed scroll 3.
[0028]
  Reference numeral 13 denotes an annular thrust receiver provided on the front end side of the cylindrical portion 1B of the casing 1, and an annular notch 13A is formed on the inner peripheral side of the thrust receiver 13, and the orbiting scroll is formed in the notch 13A. Eight end plates 8A are in sliding contact with each other. An annular sliding contact surface 13B that is in sliding contact with the end plate 8A is formed in the notch 13A of the thrust receiver 13, and the sliding contact surface 13B applies a thrust load acting on the orbiting scroll 8 between the end plate 8A. It is configured to accept.
[0029]
  Reference numerals 14 and 14 denote a pair of guide protrusions provided so as to protrude radially inward from the inner peripheral side of the thrust receiver 13, and each guide protrusion 14 slides an Oldham ring 16 described later in the left and right directions in FIG. It will guide you as possible.
[0030]
  Reference numerals 15 and 15 denote Oldham ring guide grooves provided on the rear surface side of the end plate 8A of the orbiting scroll 8, and the guide grooves 15 guide the Oldham ring 16 so as to be slidable upward and downward in FIG. is there.
[0031]
  Reference numeral 16 denotes an Oldham ring slidably provided between the orbiting scroll 8 and the thrust receiver 13. The Oldham ring 16 is guided in two orthogonal directions by a guide projection 14 and a guide groove 15. Together with the guide protrusion 14 and the guide groove 15, a rotation prevention mechanism for preventing the rotation of the orbiting scroll 8 is configured.
[0032]
  An oil supply pump 21 is provided between the sliding surfaces 8D and 13B of the orbiting scroll 8 and the thrust receiver 13, and the oil supply pump 21 includes an after-mentioned swirl accommodating recess 22, a swirler 24, and a slide plate 25. And a slide plate drive mechanism 28 and the like. The oil supply pump 21 operates following the movement of the orbiting scroll 8 and discharges the lubricating oil 2 sucked into a pump chamber 23 described later in a pressurized state. The lubricating oil 2 is statically used as the pressurized oil. While supplying to the pressure bearing part 35, it supplies also to the drive shaft 4, the bearings 5 and 6, the turning scroll 8, the turning bearing 9, etc., and these are lubricated and cooled.
[0033]
  Reference numeral 22 denotes a swirl receiving recess provided on the sliding contact surface 13B side of the thrust receiver 13, and the swivel receiving recess 22 is formed as a bottomed circular hole having a peripheral wall surface 22A as shown in FIG. A pump chamber 23 is defined between the eight sliding contact surfaces 8D. A revolving element 24 is accommodated in the pump chamber 23 of the revolving element accommodating recess 22 so as to be capable of revolving.
[0034]
  Reference numeral 24 denotes a swirler that protrudes from the rear surface side of the end plate 8A of the orbiting scroll 8. The swirler 24 is a circular protrusion that protrudes from the end plate 8A of the orbiting scroll 8 into the swivel accommodating recess 22. The end surface on the protruding end side is substantially in sliding contact with the bottom surface of the swivel accommodating recess 22. Further, on the outer peripheral side of the swirler 24, a sliding contact surface 24A composed of a plane perpendicular to the length direction of the guide groove 31 described later, that is, the X-axis direction in FIG. 10, is formed. The surface 24A is in sliding contact with the slide plate 25.
[0035]
  The swirler 24 is arranged in an eccentric state in the swivel accommodating recess 22, and the outer peripheral surface thereof is substantially in sliding contact with the peripheral wall surface 22A. For this reason, the revolving element 24 moves following the revolving scroll 8 and is configured to reciprocate along the peripheral wall surface 22 </ b> A in the revolving element accommodating recess 22. The X-axis and Y-axis directions in FIG. 10 are inclined by approximately 45 degrees with respect to the guide protrusion 14 and the guide groove 15.
[0036]
  Reference numeral 25 denotes a slide plate as a movable partition wall movably provided in the swivel accommodating recess 22, and the slide plate 25 is formed as a rectangular flat plate, and is formed in a guide groove 31 described later in FIG. It is slidably disposed along the Y-axis direction. Further, the slide plate 25 is in sliding contact with the sliding contact surface 24A of the revolving element 24 and the sliding contact surface 30A of the drive projection 30 described later, respectively, at both ends in the length direction.
[0037]
  For this reason, when the orbiting scroll 8 is revolving, the slide plate 25 is moved in the revolving unit accommodating recess 22 by following the movement of the revolving unit 24 by a slide plate driving mechanism 28 described later, and between the revolving unit 24. The interior of the pump chamber 23 of the swirl accommodating recess 22 is defined as a suction chamber 26 and a discharge chamber 27.
[0038]
  Reference numeral 28 denotes a slide plate drive mechanism that serves as a partition wall moving mechanism for moving the slide plate 25 in the rotator accommodating recess 22 following the movement of the revolver 24. The slide plate drive mechanism 28 is a recess that will be described later. A portion 29, a drive protrusion 30 and a guide groove 31 are included.
[0039]
  Reference numeral 29 denotes a recessed portion formed in the sliding contact surface 13B of the thrust receiver 13 so as to be separated from the swivel accommodating recessed portion 22, and the recessed portion 29 is formed as a recessed portion whose inner shape is substantially rectangular. The drive protrusion 30 is accommodated in the inside.
[0040]
  Reference numeral 30 denotes a drive protrusion that protrudes from the rear surface side of the end plate 8A of the orbiting scroll 8. The drive protrusion 30 is formed as a rectangular protrusion that protrudes from the end plate 8A into the recessed portion 29. Yes. Further, the drive protrusion 30 is formed with a sliding contact surface 30A composed of a flat surface facing the sliding contact surface 24A of the revolving element 24 in the Y-axis direction and extending parallel to the X-axis direction, and the sliding contact surface 30A slides. It is in sliding contact with the plate 25.
[0041]
  For this reason, the drive protrusion 30 orbits together with the revolving element 24 when the orbiting scroll 8 revolves, and guides the slide plate 25 with the slide plate 25 sandwiched between the revolving element 24 from both sides. It is configured to slide along the groove 31 in the Y-axis direction. Further, the drive protrusion 30 constitutes another rotation preventing mechanism for preventing the rotation of the orbiting scroll 8 together with the revolving element 24 and the slide plate 25 for the reason described later.
[0042]
  Reference numeral 31 denotes a guide groove for a slide plate, which is located on the sliding contact surface 13B of the thrust receiver 13 and is located between the swivel accommodating recess 22 and the recess 29, and the guide groove 31 is indicated by Y in FIG. It is formed as a groove extending elongated along the axial direction, and both end sides thereof are connected to the swivel accommodating recess 22 and the recess 29. The guide groove 31 is configured to guide the slide plate 25 so as to be slidable along the Y-axis direction.
[0043]
  An oil sump 32 is located between the swivel accommodating recess 22 and the recessed recess 29 and is provided on the sliding contact surface 13B side of the thrust receiver 13. The oil reservoir 32 is a sliding contact surface 13B of the thrust receiver 13. It is formed as a circular hole that is open to the swirl receiving recess 22 and is disposed at a position that always communicates with the swirl receiving recess 22 and a later-described oil supply passage 34 when the orbiting scroll 8 is turned. For this reason, the oil sump 32 is configured to always allow the lubricating oil 2 from the discharge chamber 27 to be discharged to the oil supply passage 34 side.
[0044]
  Reference numeral 33 denotes a suction passage formed in the thrust receiver 13. One end of the suction passage 33 is located on the lower side of the thrust receiver 13 and opens into the casing 1, and the other end is located at the suction chamber 26. An opening is formed in the bottom surface of the housing recess 22. The suction passage 33 is configured to guide the lubricating oil 2 accommodated in the casing 1 toward the suction chamber 26 by the operation of the oil supply pump 21.
[0045]
  Reference numeral 34 denotes an oil supply passage provided in the end plate 8A of the orbiting scroll 8. The oil supply passage 34 is formed of an oil passage extending elongated along the radial direction inside the end plate 8A of the orbiting scroll 8, and one end side thereof is connected to the revolving element 24. The opening 34A is located between the driving protrusion 30 and opened to the back side of the end plate 8A, and is always in communication with the discharge chamber 27 through the oil sump 32.
[0046]
  Further, the other end side of the oil supply passage 34 is an opening 34 </ b> B and is open in an arc-shaped groove 35 </ b> A of a hydrostatic bearing portion 35 described later. For this reason, the oil supply passage 34 supplies the lubricating oil 2 from the discharge chamber 27 toward the static pressure bearing portion 35 and cools the entire orbiting scroll 8 while the lubricating oil 2 flows through the oil supply passage 34. It has become.
[0047]
  Further, the oil supply passage 34 has an opening portion 34 </ b> C that opens in the boss portion 8 </ b> C of the orbiting scroll 8 at an intermediate portion in the length direction. The opening 34 </ b> C of the oil supply passage 34 supplies a part of the lubricating oil 2 in the oil supply passage 34 to the drive shaft 4 side, the slewing bearing 9 side, and the like, and returns to the casing 1 through the return passage 36 described later. A recirculation passage on the side of the orbiting scroll 8 is configured.
[0048]
  Reference numeral 35 denotes a hydrostatic bearing portion provided between the sliding contact surface 8D of the orbiting scroll 8 and the sliding contact surface 13B of the thrust receiver 13, and the static pressure bearing portion 35 is a sliding contact surface of the orbiting scroll 8. An annular groove is formed on the 8D side as shown in FIG. The hydrostatic bearing portion 35 has an inner arc-shaped groove 35A extending annularly (arc-shaped) in the circumferential direction between the orbiting scroll 8 and the thrust receiver 13, and a concentric circle around the arc-shaped groove 35A. The outer arc-shaped groove 35B is disposed, and a communication groove 35C serving as a passage communicating the arc-shaped grooves 35A and 35B in the radial direction.
[0049]
  The arc-shaped groove 35A of the hydrostatic bearing portion 35 has an opening 34B of the oil supply passage 34 at an intermediate portion in the longitudinal direction thereof, and supplies the lubricating oil 2 from the oil supply passage 34 to the arc-shaped groove 35A. In addition, the pressure is supplied to the arc-shaped groove 35B through the communication groove 35C so that the pressure of the lubricating oil 2 acts on the orbiting scroll 8 as a back pressure.Here, the arc-shaped grooves 35A and 35B extend in the circumferential direction between the orbiting scroll 8 and the thrust receiver 13 as shown in FIG. 7, and both ends thereof are closed. Furthermore, the oil pump 21 is provided between both ends of the arc-shaped grooves 35A and 35B.
[0050]
  Reference numeral 36 denotes a return passage on the drive shaft 4 side provided in the drive shaft 4. The return passage 36 extends in the axial direction inside the drive shaft 4, and one end thereof opens into the boss portion 8 </ b> C of the orbiting scroll 8. ing. The other end side of the reflux passage 36 is bent and extends in an L shape in the radial direction and opens into the bearing portion 1 </ b> C of the casing 1. As a result, a part of the lubricating oil 2 flowing through the oil supply passage 34 is supplied to the bearings 5 and 6 through the return passage 36 and gradually returned from the bearing 5 side into the casing 1. The flowing lubricating oil 2 is configured to cool the entire drive shaft 4.
[0051]
  Further, the reflux passage 36 is bent in an L shape in the radial direction from the middle position thereof, opens between the bearing portion 1 </ b> C of the casing 1 and the boss portion 8 </ b> C of the orbiting scroll 8, and the lubricating oil from the oil supply passage 34. A part of 2 is returned to the inside of the casing 1.
[0052]
  Reference numeral 37 denotes a seal member mounted between the sliding contact surfaces of the fixed scroll 3 and the orbiting scroll 8, and the sealing member 37 blocks the intrusion of the lubricating oil 2 between the sliding contact surfaces.
[0053]
  The scroll type air compressor according to the present embodiment has the above-described configuration, and the operation thereof will be described next.
[0054]
  First, when the drive shaft 4 is rotated by the electric motor, the orbiting scroll 8 performs a circular motion (orbiting motion) with a turning radius of the dimension δ around the drive shaft 4, and the orbiting scroll and the wrap portion 3 </ b> B of the fixed scroll 3. The compression chambers 10, 10,... Defined between the eight wrap portions 8B are continuously reduced. Thus, the compressed air is stored in the external air tank (not shown) or the like from the discharge port 12 of the fixed scroll 3 while sequentially compressing the outside air sucked from the suction port 11 of the fixed scroll 3 in each compression chamber 10. Let
[0055]
  When the orbiting scroll 8 is revolving, the Oldham ring 16 slides along the guide projection 14 on the thrust receiver 13 side, and the Oldham ring 16 and the orbiting scroll 8 are inserted into the guide groove 15 on the orbiting scroll 8 side. Accordingly, the rotational torque of the orbiting scroll 8 via the drive shaft 4 is received between the Oldham ring 16, the guide protrusion 14, and the guide groove 15, so that the orbiting scroll 8 does not rotate. A turning motion is performed with a turning radius of dimension δ.
[0056]
  Next, the operation of the oil supply pump 21 will be described with reference to FIG. 10. When the orbiting scroll 8 is first orbited, the revolving element 24 and the drive protrusion 30 integrated with the orbiting scroll 8 are, for example, illustrated in FIG. As shown by a two-dot chain line in FIG. 10, the inside of the swivel accommodating recess 22 and the inside of the recess 29 are swung clockwise. At this time, the slide plate 25 slides along the guide groove 31 by following both movements in a state where both end sides are in sliding contact with the revolving element 24 and the driving protrusion 30 respectively.
[0057]
  As a result, the pump chamber 23 defined between the swirl accommodating recess 22 and the orbiting scroll 8 continuously expands with the volume of the suction chamber 26 following the movement of the slide plate 25, and the inside of the casing 1. The lubricating oil 2 is sucked into the suction chamber 26 through the suction passage 33. On the other hand, the volume of the discharge chamber 27 continuously decreases following the movement of the slide plate 25, and the lubricating oil 2 in the discharge chamber 27 is discharged from the oil reservoir 32 toward the oil supply passage 34.
[0058]
  Thus, in the present embodiment, the hydrostatic bearing portion 35 is provided on the sliding contact surface 8D side of the orbiting scroll 8 that is in sliding contact with the thrust receiver 13, and the oil supply passage 21 communicates between the oil supply pump 21 and the hydrostatic bearing portion 35. Therefore, the lubricating oil 2 discharged from the oil pump 21 during the compression operation can be supplied as pressure oil to the arc-shaped grooves 35A and 35B and the communication groove 35C of the hydrostatic bearing portion 35.
[0059]
  Thus, the pressure of the lubricating oil 2 supplied to the hydrostatic bearing 35 can be applied to the orbiting scroll 8 as a back pressure, and the orbiting scroll 8 is fixed against the thrust load acting on the orbiting scroll 8. A separating force can be generated in the direction away from the thrust receiver 13 toward the scroll 3, and the sliding contact surfaces 8 </ b> D and 13 </ b> B can be maintained in a lubricated state by the lubricating oil 2 of the hydrostatic bearing portion 35.
[0060]
  Further, since the arc-shaped grooves 35A and 35B of the hydrostatic bearing portion 35 are arranged concentrically in the circumferential direction of the orbiting scroll 8, the sliding contact surface 8D of the orbiting scroll 8 and the sliding contact surface 13B of the thrust receiver 13 are arranged. In the meantime, the lubricating oil 2 from the oil supply pump 21 can be evenly guided along the circumferential direction of the orbiting scroll 8 by the arc-shaped grooves 35A and 35B, and swirled by the lubricating oil 2 of the arc-shaped grooves 35A and 35B. The entire scroll 8 can be stably pressed in the axial direction toward the fixed scroll 3, and the entire sliding contact surfaces 8D and 13B can be well lubricated by the lubricating oil 2 in the arc-shaped grooves 35A and 35B.
[0061]
  Further, since the hydrostatic bearing portion 35 is constituted by two arc-shaped grooves 35A and 35B, the lubricating oil 2 can be supplied to both the arc-shaped groove 35A and the arc-shaped groove 35B, and a stable back pressure is applied to the orbiting scroll 8. Can act.
[0062]
  Therefore, according to the present embodiment, as described in the prior art, even during the compression operation, even if the thrust load acting on the orbiting scroll 8 increases, the orbiting is performed by the lubricating oil 2 guided into the hydrostatic bearing portion 35. The sliding resistance between the slidable contact surface 8D of the scroll 8 and the slidable contact surface 13B of the thrust receiver 13 can be reduced, and wear generated on these slidable contact surfaces 8D and 13B can be reduced. The durability, life, etc. of the scroll air compressor can be improved, and the reliability of the scroll type air compressor can be improved.
[0063]
  Further, the oil supply passage 34 is disposed so as to be elongated along the radial direction inside the orbiting scroll 8, and an intermediate portion of the oil supply passage 34 is opened in the boss portion 8 </ b> C of the orbiting scroll 8 through the opening 34 </ b> C. Therefore, the lubricating oil 2 from the oil supply pump 21 can be discharged into the boss portion 8C to lubricate and cool the slewing bearing 9, and the lubricating oil 2 can be stably supplied to the bearings 5 and 6 through the reflux passage 36. These bearings 5 and 6 can be lubricated and cooled.
[0064]
  Further, while the lubricating oil 2 flows through the oil supply passage 34 and the reflux passage 36, the orbiting scroll 8 and the drive shaft 4 can be cooled, respectively, and the entire apparatus can be efficiently cooled. The lubricating oil 2 flowing through the opening 34C of the oil supply passage 34 and the reflux passage 36 is sequentially returned to the casing 1 after the slewing bearing 9, the drive shaft 4, and the bearings 5 and 6 are cooled. The pressure of the pressurized oil discharged from the fuel can be adjusted by the amount of the reflux oil.
[0065]
  On the other hand, in the present embodiment, the oil supply pump 21 has a configuration in which a pump chamber 23 including a suction chamber 26 and a discharge chamber 27 is provided between the sliding contact surfaces 8D and 13B of the orbiting scroll 8 and the thrust receiver 13. Therefore, the pump chamber 23 can be disposed on the opposite side of the compression chamber 10 with the end plate 8A of the orbiting scroll 8 interposed therebetween.
[0066]
  As a result, the pressure of the high-pressure lubricating oil 2 pressurized in the pump chamber 23 does not act on the outer sliding surface of the fixed scroll 3 and the orbiting scroll 8, so that the lubricating oil 2 causes the seal member 37 to move from this position. Accordingly, it is possible to prevent a situation in which the air is leaked into the compression chamber 10, and it is possible to always discharge clean compressed air from the discharge port 12 to the outside, thereby improving the performance, reliability, and the like of the apparatus.
[0067]
  Further, since the oil sump 32 and the oil supply passage 34 are always kept in communication with each other, the pressure fluctuation of the lubricating oil 2 in the oil sump 32 and the discharge chamber 27 can be suppressed. The displacement of the scroll 8 in the thrust direction can be suppressed. And the lubricating oil 2 from the discharge chamber 27 can always be smoothly discharged toward the oil supply path 34, the discharge efficiency of the lubricating oil 2 by the oil supply pump 21 can be improved, and the pump performance can be improved.
[0068]
  Further, the revolving element 24 and the driving protrusion 30 provided integrally with the orbiting scroll 8 are arranged so that the sliding contact surfaces 24A and 30A that are in sliding contact with the slide plate 25 are parallel to the X-axis direction. The revolving element 24 and the drive protrusion 30 can be slid relative to the slide plate 25 in the X-axis direction.
[0069]
  In this case, since the slide plate 25 slides in the Y-axis direction along the guide groove 31 on the thrust receiver 13 side as described above, the swing plate 24, the slide plate 25, the drive protrusion 30 and the guide groove 31 rotate. Another rotation prevention mechanism for preventing the rotation of the scroll 8 can be configured. Thereby, the rotation torque from the orbiting scroll 8 added to the rotation prevention mechanism including the Oldham ring 16 and the like can be reduced by the other rotation prevention mechanism, and the durability, life, etc. of the Oldham ring 16 can be improved.
[0070]
  Further, since the slide plate 25 is attached in a state of being sandwiched between the revolving element 24 and the driving protrusion 30, the slide plate 25 is guided while following the movement of the revolving element 24 and the driving protrusion 30. The slide plate 25 can be slid along the groove 31. For example, the problem that the slide plate 25 moves in the swivel accommodating recess 22 after the movement of the swivel 24 can be eliminated. The followability can be improved and the pump performance of the oil pump 21 can be further improved..
[0071]
  NaIn the first embodiment, the hydrostatic bearing portion 35 is described as being provided on the sliding contact surface 8D side of the orbiting scroll 8. However, instead of this, for example,BasuIt is good also as a structure which provides a hydrostatic bearing part in the sliding contact surface 13B side of the last receiver 13, and always connects the opening part 34B of the oil supply path 34 with this hydrostatic bearing part..
[0072]
  AlsoIn the first embodiment, it has been described that the hydrostatic bearing portion 35 is constituted by two arc-shaped grooves 35A and 35B, but in place of this, three or more arc-shaped grooves may be provided. 1 may be.
[0073]
  further,AboveIn the embodiment, the scroll type air compressor has been described as an example of the scroll type fluid machine. However, the present invention is not limited to this and can be widely applied to, for example, a vacuum pump, a refrigerant compressor, and the like.
[0074]
【The invention's effect】
  As described in detail above, the invention according to claim 1 is configured to supply the oil in the casing to the hydrostatic bearing portion between the orbiting scroll and the thrust receiver in a pressurized state by the oil supply pump.The hydrostatic bearing portion is formed on either one of the sliding contact surfaces of the sliding scroll between the rear surface side and the thrust receiver and extends in the circumferential direction between the orbiting scroll and the thrust receiver. The oil pump is provided between both ends of the annular groove, and the annular groove is an opening through which pressurized oil discharged from the oil pump is supplied. And having a configurationTherefore, by operating the oil pump during the compression operation, the pressure oil from the oil pump acts on the back side of the orbiting scroll as a back pressure, and the opening force in the direction of separating the orbiting scroll from the thrust receiver can be generated. At the same time, it is possible to keep the sliding contact surface between the back side of the orbiting scroll and the thrust receiver in a lubricated state by the pressurized oil of the hydrostatic bearing portion.
[0075]
  As a result, even if the thrust load acting on the orbiting scroll increases, the sliding resistance between the sliding contact surface between the back side of the orbiting scroll and the thrust receiver can be reduced by the pressurized oil of the hydrostatic bearing portion. The wear generated on the contact surface can be reduced, the durability and life of the orbiting scroll and the thrust receiver can be increased, and the reliability of the scroll fluid machine can be improved.In addition, since the hydrostatic bearing portion is formed as an annular groove extending in the circumferential direction between the orbiting scroll and the thrust receiver, the pressure oil supplied to the annular groove causes the entire orbiting scroll to be substantially evenly applied by the back pressure. A separation force can be generated, the entire sliding contact surface between the orbiting scroll and the thrust receiver can be lubricated well, and the durability and life of the orbiting scroll and the thrust receiver can be further enhanced. The oil pump may be provided between both ends of the annular groove.
[0076]
  The invention of claim 2according to,The casing is provided with a suction passage that sucks oil into the oil pump.Orbiting scrollIs provided with an oil supply passage through which pressurized oil flows from the oil pump to the hydrostatic bearing.AsTherefore, the oil supply pump sucks and pressurizes the oil in the casing from the suction passage, and smoothly supplies this pressurized oil to the hydrostatic bearing through the oil supply passage.Can.
[0077]
  Further, as in the third aspect of the invention, when the annular groove is constituted by a plurality of arc-shaped grooves concentrically arranged between the sliding contact surfaces of the orbiting scroll and the thrust receiver, the arc-shaped groove The opening force can be evenly generated by the orbiting scroll by an amount corresponding to the increase in the number, and the durability of the orbiting scroll and the thrust receiver can be further enhanced.
[0078]
  Furthermore, in the invention of claim 4, since the oil pump is provided between the orbiting scroll and the thrust receiver and is operated in accordance with the movement of the orbiting scroll, the oil pump is compressed by sandwiching the end plate of the orbiting scroll. It can be arranged on the opposite side of the chamber, can prevent the pressurized oil discharged from the oil pump from leaking to the compression chamber side, and always discharge clean compressed fluid to the outside it can. Moreover, it is not necessary to provide a drive source for operating the oil pump, and the structure of the oil pump can be simplified.
[0079]
  Furthermore, in the invention of claim 5, the oil supply passage is arranged along the radial direction of the orbiting scroll, so that the orbiting scroll can be efficiently cooled while the pressurized oil from the oil supply pump flows in the oil supply passage. This also improves the durability of the orbiting scroll.
[0080]
  On the other hand, the invention of claim 6according to,Refueling passageOiling pumpIn the middle part between the ring groove andIn casingPressurized oilRefluxCommunicate with the return passageTherefore, a part of the pressurized oil discharged from the oil pump can always be recirculated into the casing, and the pressure of the pressurized oil can be adjusted. can do.
[0081]
  The invention of claim 7With fixed scrollOrbiting scrollA seal member is provided between the sliding contact surfaceSo thatThe fixed scroll and theOrbiting scrollBlocks the intrusion of lubricating oil between the sliding contact surfacesCan.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view taken along the line II of FIG. 3 showing a scroll type air compressor according to a first embodiment of the present invention.
2 is an enlarged cross-sectional view of a main portion showing an oil supply passage, a hydrostatic bearing portion, and the like in FIG. 1;
FIG. 3 is a front view of the orbiting scroll, the thrust receiver, etc. with the fixed scroll removed, as viewed from the direction of arrows III-III in FIG.
4 is a cross-sectional view taken from the direction of arrows IV-IV in FIG. 2, showing the thrust receiver, Oldham ring, oil supply pump, and the like.
5 is a cross-sectional view taken from the direction of arrows VV in FIG. 2 showing a thrust receiver, an Oldham ring, an oil supply pump, and the like.
6 is a front view of only the thrust receiver as viewed from the direction of arrows VI-VI in FIG. 1. FIG.
7 is a rear view of only the orbiting scroll viewed from the direction of arrows VII-VII in FIG. 1. FIG.
8 is a cross-sectional view taken from the direction of arrows VIII-VIII in FIG.
9 is a cross-sectional view seen from the direction of arrows IX-XI in FIG.
10 is an enlarged cross-sectional view of a main part showing the oil pump in FIG. 5 in an enlarged manner..
[Explanation of symbols]
  1 casing
  2 Lubricating oil (oil liquid)
  3 Fixed scroll
  3A, 8AEnd plate
  3B, 8BLap section
  4 Drive shaft
  8Orbiting scroll
  8CBoss
  8D, 13BSliding surface
  9 Slewing bearing
  10 Compression chamber
  13Thrust receiver
  21Oiling pump
  22 Retractor recess
  22A wall surface
  23 Pump room
  24 Swivel
  25 Slide plate (movable bulkhead)
  26 Suction chamber
  27 Discharge chamber
  28 Slide plate drive mechanism (partition wall drive mechanism)
  33 Suction passage
  34 Refueling passage
  34B opening
  35 Hydrostatic bearing
  35A, 35BArc groove
  35C Communication groove (passage)
  36Reflux passage
  37 Seal member

Claims (7)

A casing, a fixed scroll provided with a spiral lap portion on the end plate, and a drive shaft rotatably provided on the casing; and a swivel bearing on the distal end side of the drive shaft in the casing A revolving scroll provided with a wrap portion standing on the end plate so as to overlap the wrap portion of the fixed scroll and defining a plurality of compression chambers, and a thrust load acting on the revolving scroll In a scroll fluid machine comprising a thrust receiver provided in the casing and in sliding contact with the back side of the orbiting scroll,
An oil supply pump that sucks and discharges the oil contained in the casing in a pressurized state, and pressurized oil that is provided between the back side of the orbiting scroll and the thrust receiver and is discharged from the oil supply pump to the orbiting scroll. With a hydrostatic bearing that acts as back pressure ,
The hydrostatic bearing portion is formed on either one of the sliding contact surfaces of the orbiting scroll on the back surface side and the thrust receiver and extends in the circumferential direction between the orbiting scroll and the thrust receiver. Is constituted by a closed annular groove,
The oil pump is provided between both ends of the annular groove,
The scroll fluid machine according to claim 1, wherein the annular groove has an opening through which pressurized oil discharged from the oil supply pump is supplied . The said casing is provided with a suction passage for sucking oil into the oil pump, and the orbiting scroll is provided with an oil passage through which the pressurized oil flows from the oil pump to the hydrostatic bearing. Scroll fluid machine.   The annular groove includes a plurality of arc-shaped grooves extending concentrically between the back side of the orbiting scroll and the thrust receiver, and a passage through which the pressurized oil flows is provided between the arc-shaped grooves. The scroll fluid machine according to claim 2 formed. The oil supply pump is provided between the receiving thrust and the orbiting scroll, and configured to be actuated in accordance with a movement of the orbiting scroll, and supplies the pressurized oil from the previous SL Lubrication pump before Symbol Lubrication passage The scroll fluid machine according to claim 2 or 3.   5. The scroll type according to claim 4, wherein the oil supply passage is configured by an oil passage extending in a radial direction of the orbiting scroll and having one end side opened to a discharge side of the oil supply pump and the other end side opened to a middle portion of the annular groove. Fluid machinery. In the middle region between the oil supply passage the oil supply pump and the annular groove, claim 2 comprising a structure which communicates with the recirculation passage for recirculating pressurized oil in the casing, according to 3, 4 or 5 Scroll type fluid machine. The scroll fluid machine according to claim 1, 2, 3, 4, 5 or 6, further comprising a seal member between sliding surfaces of the fixed scroll and the orbiting scroll .

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