JP4556183B2 - Scroll fluid machinery - Google Patents

Description

  The present invention relates to a scroll fluid machine including one scroll and the other scroll that performs a turning motion relative to the one scroll.

  In Patent Document 1, a spiral wrap is erected between the driving scroll end plate and the driven scroll end plate, meshed face to face, and the driven scroll is revolved with respect to the driving scroll, and a closed space generated by the rotation of the two is obtained. A full-system rotary scroll fluid machine that sequentially reduces and moves from the outer peripheral side to the inner peripheral side to compress and discharge fluid is disclosed.

  Patent Document 2 is based on the applicant, and includes a casing, an outer peripheral block rotatably supported by the casing, and a driven scroll unit including at least a driven wrap extending inward from the outer peripheral block. A drive lap that meshes with the driven lap, a pair of end plates that nip and fix the drive wrap and slidably hold the driven lap, and a shaft that is eccentric to the driven scroll unit and is rotatably supported by the casing. A driven scroll unit that rotates the end plate and defines a compression space together with the driven scroll unit; a suction port that is formed in the outer peripheral block and communicates with the compression space; and the drive shaft. Scroll flow formed and formed at least by a discharge port communicating with the compression space It discloses a machine.

Non-Patent Document 1 discloses that a fan or blower is configured by combining a balance type impeller using two spirals, one connected directly to a motor shaft, and the other driven by a spiral side wall. To do.
JP-A-9-133307 JP 2004-286025 A Proceedings of the Japan Society of Mechanical Engineers (B), Vol. 54, No. 498 (Akira 63-2), Paper No. 87-0436B "Research on scroll fans and blowers"

  The entire-system rotary scroll fluid machine disclosed in Patent Literature 1 performs a turning motion with respect to the drive scroll while the driven scroll rotates as the drive scroll rotates, thereby reducing the volume of the closed space. However, the end plate that defines the closed space is subject to a thrust load acting in the direction of separating the end plates, and a large load is applied to the bearing. In addition, when increasing the volume of the closed space in order to increase the discharge capacity, it is necessary to increase the height of the spiral wrap, but in this case, the radial load is perpendicular to the axis at a position half the wrap height. Therefore, in the case of the cantilever type as in Patent Document 1, there is a problem that the overturning moment increases.

  For this reason, the present applicant, in Patent Document 2, provided a pair of end plates so that the lap of the drive scroll is sandwiched between both ends thereof, and further enables the driven scroll wrap to be turned between the both end plates. Thus, a scroll fluid machine is disclosed in which the load applied in the axial direction is offset by the lap strength of the drive scroll and the thrust load does not act on the bearing, so that the capacity of the compression space can be increased.

  Since the scroll fluid machine disclosed in Non-Patent Document 1 uses two wraps of the same shape on the driving scroll side and the driven scroll side, and each is shifted and combined by π / 2 (90 degrees), Since the end portion is also arranged in a state shifted by π / 2 (90 degrees), there is a problem that a portion that does not contribute to compression occurs.

  In the scroll fluid machine disclosed in Patent Document 2, it is possible to improve the discharge capacity by further improving the lap strength of the driven scroll. In the case of the above-described reference, both the driving scroll and the driven scroll rotate, so that it is estimated that the ability can be further improved by improving the rotation balance.

  For this reason, the present invention is to provide a scroll fluid machine in which the lap strength is improved and the rotation balance is improved, and a useless space between the laps is eliminated.

  Accordingly, the present invention provides a housing, a first scroll unit that is rotatable in the housing, and rotates with the rotation of the first scroll unit, and is rotated relative to the first scroll unit. A scroll fluid machine that performs suction and discharge by changing a volume of a compression space defined by the first scroll unit and the second scroll unit. The first scroll unit includes a pair of end plates rotatably supported by the housing, and a first wrap including a plurality of spiral wraps fixed between the two end plates and evenly arranged at a predetermined center angle. The second scroll unit is slidably sandwiched between a pair of end plates of the first scroll unit. A cylindrical outer peripheral ring portion, a connection block portion arranged at a substantially central portion, and a plurality of insertion spaces extending from the ring portion to the connection block portion and into which the respective laps of the first wrap group are inserted And a second wrap group composed of a plurality of spiral wraps defining the compression space between the wrap and the first wrap group. It is desirable that one of the first scroll unit and the second scroll unit is a drive scroll unit and the other is a driven scroll unit.

  Each of the first lap group and the second lap group uses two laps each having an involute curve, and is configured by shifting the starting point by 180 degrees, and at the end of each lap constituting the second lap group. It is desirable that the extension angle (Φend) is increased by π / 2 (90 degrees) with respect to the extension angle (Φend) of the final end of each lap constituting the first wrap group.

  Further, the central angle is 180 degrees, and the first lap group and the second lap group are preferably each composed of two laps, for example, each composed of three wraps at 120 degrees each. However, the number is not particularly limited.

  The ring portion of the second scroll unit is formed with an air inlet communicating with the respective meshing spaces in the vicinity of the end Φend of the second lap, and the connection block portion is formed on the support shaft. It is desirable to form a communication portion that communicates with the discharged outlet. The communication part may be in the form of a groove or a hole.

  Therefore, the present invention has sufficient strength since both ends of the second wrap of the second scroll unit of the second scroll unit are held by the radially outer ring portion and the radially inner connecting block portion. Furthermore, since it is balanced with respect to the center of rotation of the wrap, high-speed rotation is possible.

  Further, the wrap of the first wrap group is inserted into the insertion space defined by the wrap of the second wrap group, and the second wrap end is extended to the outer peripheral end Φend of the wrap of the first wrap group. Since the Φ end of the wrap of the wrap group extends, the compression space formed by the first wrap group and the second wrap group also works effectively on the outer wall of the Φ end of the first wrap. The capacity can be increased.

  Thus, according to the present invention, the strength is sufficient, the rotation balance is good and high-speed rotation is possible, further sufficient discharge capacity can be ensured, and the rotation speed can be smoothly changed. The pulsation of the discharge fluid can be reduced, and it is possible to immediately cope with the fluctuation of the discharge capacity.

  Embodiments of the present invention will be described below with reference to the drawings.

  A scroll fluid machine 1 according to the present invention is shown in FIG. 1, for example, and includes a housing 3 fixed to a base 2 and a first scroll unit rotatably held in the housing (in this embodiment, a driving scroll). Unit) 10 and a second scroll unit (in this embodiment, a driven scroll unit) 20 that is slidably held between the drive scroll unit 10 and performs a turning motion with respect to the drive scroll unit 10 by the rotation synchronization mechanism 30. The volume of the compression space 40 defined by the drive scroll unit 10 and the driven scroll unit 20 is sequentially reduced from the outer peripheral side to the center side to perform the compression action.

  The housing 3 includes a cylindrical first housing 3A, and a second housing 3B and a third housing 3C that close the first housing 3A from both axial sides, and the second housing 3B. The third housing 3C holds the drive scroll unit 10 via bearings 62 and 63 in a rotatable manner. Reference numeral 61 denotes an oil seal portion.

  The drive scroll unit 10 includes a first drive scroll member 10A as shown in FIGS. 2 (a) and 2 (b) and a drive scroll receiving member 10B as shown in FIGS. 3 (a) and 3 (b). Is done. The first drive scroll member 10A includes a rotary shaft 11 that is rotatably supported by the third housing via a bearing 62, and a disk-shaped first end plate in which the rotary shaft 11 is integrally formed. A plurality of spiral wraps (driving laps) that are integrally formed so as to stand upright in the axial direction from the first end plate portion 12 and at a predetermined center angle. ) 13. A plurality of drive wraps 13 constitute a first lap group.

  The drive scroll receiving member 10B includes a support shaft 14 that is rotatably supported by the second housing 3B via a bearing 63, and a disk-shaped second end formed integrally with the support shaft 14. The second end plate portion 15 is formed with a mounting groove 18 into which the axial end portion of the drive wrap 13 is inserted, and the support shaft 14 has a discharge hole. 16 is provided penetrating. In this embodiment, after the following driven scroll unit 20 is mounted, the driving scroll member 10A and the driving scroll receiving member 10B are fixed by screws. External power is transmitted to the rotary shaft 11 via a coupling 54.

  As shown in FIGS. 4A and 4B, the driven scroll unit 20 includes an outer peripheral ring portion 21 located in the outer peripheral portion, a connecting block portion 23 located in the central portion, the outer peripheral ring portion 21 and the The connecting block portion 23 is connected in a spiral shape, and is constituted by a plurality of wraps (driven wraps) 22 that define an insertion space 26 into which the driving wrap 13 of the first wrap group is inserted. Furthermore, a plurality of compression spaces 40 are defined between the driven wrap 22 and the driven wrap 13 by inserting the drive wrap 13 into the insertion space 26.

  Further, the driven wrap 22 is formed integrally with the outer peripheral ring portion 21 along the outer peripheral ring portion 21, and the block wrap portion 22B in which the insertion space 26 is formed along the inner peripheral side surface. An extended lap portion 22A that spirally extends from the lap portion 22B to the connecting block portion 23 along the insertion space 26, and the plurality of driven wraps 22 constitute a second lap group. Further, as shown in FIG. 5, the end of the block wrap portion 22 </ b> B of the driven wrap 22, so-called ΦendE of the driven wrap 22 extends to a position close to the outer peripheral end (Φend) of the drive wrap 13. . For this reason, since the outer wall of the wrap 13 is effectively utilized up to Φend, the capacity of the compression space 40 can be secured.

  In addition, a communication groove 24 that communicates between the compression space 40 and the discharge hole 16 is formed in the connection block portion 23. In addition, mounting grooves 27 in which the seal member 70 is mounted are formed at both axial ends of the driven wrap 23.

  Further, the driven scroll unit 20 is fixed in the vicinity of the outer periphery of the ring portion 21 and is located outside the both end plate portions 12 and 15 of the drive scroll unit 10, and the second and third housings 3B and 3C. On the other hand, a pair of scroll receivers (driven scroll receivers) 28 and 29 that are rotatably supported via bearings 64 and 65 are provided.

  An oil seal member 51 is provided on the outer peripheral edge of the support shaft 14, and an oil seal receiving member 50 that holds the oil seal member 51 is fixed to the second housing 3B. Further, a cap portion 52 is disposed at an end portion of the oil seal receiving member 50, and a discharge port 53 communicating with the discharge hole 16 is formed in the cap portion 52.

  A rotation synchronization mechanism 30 is provided between the end plates 12 and 15 of the drive scroll unit 20 and the driven scroll receiving members 27 and 28. The rotation synchronizing mechanism 30 is composed of an SP pin 31 and an SP ring 32 that meshes with it, an Oldham groove 34 formed on the end plates 12 and 15 side, and formed on the driven scroll receiving members 27 and 28 side. Each of the Oldham grooves 33 and Oldham sliders meshing with the Oldham grooves 33 and 34 is shown in FIG. Any one of these may be provided, and another rotation synchronization mechanism may be used.

  With the above configuration, as shown in FIGS. 1 and 5, the suction port 41 formed in the first housing 3 </ b> A of the housing 3 passes through the suction hole 25 through the internal space 42 defined by the housing 3. Gas and liquid (hereinafter referred to as fluid) are sucked in the expansion stroke of the compression space 40, the fluid is compressed in the reduction stroke performed in accordance with the movement toward the center of the compression space 40, and the communication groove is formed at the central end. 23 through the discharge hole 16 and the discharge port 53.

  The scroll fluid machine having the above configuration can be used as an air pump because air can be compressed and discharged by opening the suction port to the outside air. Moreover, it can utilize for a water droplet scattering system etc. as an air blower.

  Further, by providing a piping facility at the suction port, it can be used as an oil pump, a water pump, or a vacuum pump that sucks and discharges liquid or the like.

  Furthermore, since the rotation balance is good, it is possible to cope with a sudden change in the rotation speed and a sudden change demand of the sudden discharge capacity, so that it can be used for a turbo mechanism such as an internal combustion engine.

It is a schematic block diagram of the scroll fluid machine of this invention. (A) is a partial cross section side view of the drive scroll member of the scroll fluid machine of this invention, (b) is a front view. (A) is a front view of a drive scroll receiving member, (b) is the sectional drawing. (A) is a front view of a driven scroll member, (b) is the sectional drawing. It is explanatory sectional drawing which showed the structure of the scroll fluid machine of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Scroll fluid machine 2 Base 3 Housing 10 Drive scroll unit 10A Drive scroll member 10B Drive scroll receiving member 11 Rotating shaft 12 End plate 13 (Drive) Wrap 14 Support shaft 15 End plate 16 Discharge hole 20 Driven scroll unit 21 Ring part 22 ( (Driven) lap 23 connecting block portion 24 communication groove 27, 28 (driven) scroll receiver 30 rotation synchronization mechanism 40 compression space 41 suction port

Claims (4)

A housing, a first scroll unit that is rotatable in the housing, and a second scroll unit that rotates with the rotation of the first scroll unit and performs a turning motion relative to the first scroll unit; A scroll fluid machine that includes a scroll unit, and performs suction and discharge by changing a volume of a compression space defined by the first scroll unit and the second scroll unit;
The first scroll unit includes a pair of end plates that are rotatably supported by the housing, and a plurality of spiral wraps that are fixed between the two end plates and are evenly arranged at a predetermined central angle. 1 lap group,
The second scroll unit includes a cylindrical outer peripheral ring portion that is slidably sandwiched between a pair of end plates of the first scroll unit, a connection block portion that is disposed at a substantially central portion, and the ring portion. A plurality of insertion spaces that extend from the connecting block portion to the respective wraps of the first wrap group are defined, and the compression space is formed between the wraps of the first wrap group. A scroll fluid machine, comprising: a second wrap group composed of a plurality of spiral wraps.   2. The scroll fluid machine according to claim 1, wherein each of the first lap group and the second lap group uses two laps each having an involute curve, and the start point is shifted by 180 degrees.   The extension angle of the final end of each lap constituting the second wrap group is increased by π / 2 with respect to the extension angle of the final end of each lap constituting the first wrap group. The scroll fluid machine according to claim 1 or 2, wherein the scroll fluid machine is provided.   In the ring portion of the second scroll unit, an air inlet communicating with the respective meshing spaces is formed in the vicinity of the end of the second lap, and in the connection block portion, a discharge formed on the support shaft is formed. The scroll fluid machine according to claim 1, 2, or 3, wherein a communication portion communicating with the outlet is formed.

Images