JP2014101791A - Scroll fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll fluid machine having means for improving a compression capacity.SOLUTION: A driving scroll unit 6 includes a pair of driving scroll members 61, 62 for holding a driven scroll unit 7. The driving scroll members include rotating shafts 63, 66 supported by a housing 4, end plates 64, 68 extending from the rotating shafts in a diametral direction, and driving laps 65, 69 extending from the end plates in an axial direction and extending from the center of the end plate in an outer peripheral direction. The driven scroll unit includes a driven scroll member including an end plate 71 and driven laps 72, 73 and a pair of driven scroll receptors 81, 82 for freely rotatably supporting the driven scroll members by the housing. A pair of driving scroll members are foxed by a plurality of supporting pins 21, 22 and 23. Supporting pins are passed through the driven scroll member, and openings 75, 76 and 77 having an opening area of a swivelling range of the supporting pins are formed at positions corresponding to the supporting pins.

Description

  The present invention is a drive scroll unit that rotates with rotation of a rotary shaft connected to external power such as an electric motor, and rotates with the drive scroll unit and performs a turning motion relative to the drive scroll unit, The present invention relates to a scroll fluid machine including a driven scroll unit that compresses and discharges fluid by gradually reducing a compression space formed between driving scroll units from the outside toward the center.

  Patent Document 1 (Japanese Patent Laid-Open No. 2011-99362) discloses a scroll fluid machine in which a driven scroll unit includes an outer peripheral annular block portion and an annular shape in order to increase the lap strength of the driven scroll while ensuring the compression capacity of the scroll. A helical extension in the center direction from the block portion, and an extension wrap portion extending in the center direction from the fixed lap portion and the outer peripheral annular block portion, and a helical space in the outer peripheral annular block portion. A driven side wrap portion that defines, and a reinforcing portion that reinforces the extension wrap by connecting a substantially axial center in a radial direction in an inner portion of a predetermined range of the extension wrap portion and the fixed lap portion. A driving scroll holding portion disposed in a spiral space in which the reinforcing portion is not formed and continuously connecting between the pair of end plates; Extends from the end plate in the axial direction is disclosed that consists of a contact portion which slidably abut the reinforcing portion.

  Patent Document 2 (Japanese Patent Application Laid-Open No. 7-103154) discloses that the suction port is connected to the shaft of the driven scroll in order to reduce the centrifugal force acting on the gas passing through the suction port and to allow the gas to be fed well into the compression space. Displacement to the center side, and the center of the circle of the driven scroll wrap is eccentric with respect to the axis of the driven scroll, and the drive is driven to correspond to the eccentricity of the center of the circle of the driven scroll lap. A scroll compressor in which the center of the base circle of the scroll wrap is eccentric with respect to the axis of the drive scroll.

  Patent Document 3 (Japanese Patent Laid-Open No. 7-103160) discloses scroll compression in which the involute base circle of each involute trap is an ellipse or an ellipse in order to increase the excluded volume of the scroll under restricted conditions. Provide a machine.

JP 2011-99362 A JP-A-7-103154 JP-A-7-103160

  As described above, in the conventional scroll fluid machine, there are problems such as securing the compression capacity of the scroll, improving the intake of fluid into the compression space, increasing the lap strength of the driven scroll, Patent Documents 1 to 3 described above each have means for solving the problem, but it has been difficult to solve all of the problems.

  For this reason, this invention makes it a subject to provide the scroll fluid machine which provided the means for improving a compression capability while taking various means in order to solve the conventional subject.

  Therefore, the present invention provides a housing, a driving scroll unit rotatably supported by the housing, and a driven unit that is disposed in the driving scroll unit and changes a volume of a compression space formed between the driving scroll unit. In a scroll fluid machine comprising: a scroll unit; and a rotation synchronization mechanism that rotates the driven scroll unit together with the drive scroll unit to perform a turning motion relative to the drive scroll unit, the drive scroll unit includes: A pair of driving scroll members arranged so as to sandwich the driven scroll unit are provided, and each driving scroll member is rotatably supported by the housing, and extends radially from the rotating shaft. End plate and axially extending from the end plate And a driving lap portion that spirally extends from the center of the end plate in the outer circumferential direction, the driven scroll unit is an end plate disposed between the pair of driving scroll members, and both axial ends from the end plate A driven scroll member having a pair of driven lap portions extending into the mesh with each of the drive lap portions to define a compression space, and the driven scroll member from the outside of each of the drive scroll members to the housing A pair of driven scroll receivers rotatably held by the pair of driven scroll members, and the driven scroll members are fixed by a plurality of support pins that connect the vicinity of the outer periphery of each of the driven scroll members at a predetermined interval. In the scroll member, the support pin penetrates, and an opening having an opening area in a swing range of the support pin is formed in the support pin. It is to be formed in response to the position.

  Accordingly, the driving scroll member is fixed in the axial direction by a plurality of, for example, three support pins penetrating the driven scroll member, so that the thrust load due to the internal pressure generated in the compression space can be offset. In addition, since the thrust load applied to the driving wrap portion and the driven wrap portion is also constant, the tip seal provided at the tip of the driving wrap portion and the driven wrap portion can slide with an even contact force. is there.

  Moreover, it is desirable that one of the openings is located in the vicinity of the end of winding of the driven wrap portion. As a result, the openings and the support pins are arranged at intervals of 120 ° near the outer periphery.

  As a result, the outer diameter of the driven scroll member can be reduced.

  Further, it is desirable that an outer peripheral rib is formed on the outer peripheral portion of the driven scroll member, and the radial thickness of the outer peripheral rib is adjusted so that the center of rotation and the center of gravity of the driven scroll member coincide with each other. For example, this can be achieved by changing the position of the outer diameter center and the inner diameter center of the outer peripheral rib to make the thickness of the outer peripheral rib non-uniform and offset the bias of the center of gravity of the scroll wrap.

  Furthermore, it is desirable that an outer peripheral rib is formed on the outer peripheral portion of each driving scrur member, and that the radial thickness of the outer peripheral rib be adjusted so that the center of rotation and the center of gravity of the driving scroll member coincide with each other. . For example, this can be achieved by changing the position of the outer diameter center and the inner diameter center of the outer peripheral rib to make the thickness of the outer peripheral rib non-uniform and offset the bias of the center of gravity of the scroll wrap.

  Accordingly, the center of gravity of the driven scroll unit and the drive scroll unit can be matched with the center of rotation, and therefore, the rotation balance can be kept good without providing a balance weight or the like.

  Further, it is desirable that the rotation synchronization mechanism is provided between an end plate of each of the drive scroll units and the driven scroll receiver. As a result, the rotation synchronization mechanism can be arranged on both sides of the drive scroll member, so that the load on the rotation synchronization mechanism can be halved.

  According to the present invention, since the pair of driving scroll members are fixed by the three support pins, the thrust load due to the internally generated pressure can be offset, so that the driving scroll member can be rotatably held in the housing. Since a thrust load is not generated on the holding means, for example, a bearing, the life can be extended.

  In addition, since the center of gravity of the driven scroll unit and the drive scroll unit is made to coincide with the center of rotation, the balance of rotation can be maintained well without providing a balance weight or the like. The capacity can be increased.

FIG. 1 is a schematic configuration diagram of a scroll fluid machine according to the present invention. 2A and 2B are explanatory views of the drive scroll member according to the present invention, in which FIG. 2A is a front view thereof, FIG. 2B is a sectional view thereof, and FIG. 2C is a rear view thereof. FIG. 3 is an explanatory view of a driven scroll member according to the present invention, in which (a) is a left side view thereof, (b) is a sectional view thereof, and (c) is a right side view thereof. FIG. 4 is an explanatory view showing the arrangement of the driven scroll member and the drive scroll member.

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

  As shown in FIG. 1, a scroll fluid machine 1 according to an embodiment of the present invention includes an electric motor 2 as a driving means and a compression unit 3 connected to the electric motor 2. The driving means is an electric motor. It is not limited to two.

  The compression unit 3 includes a housing 4 that fixes the electric motor 2 and defines a storage space 5, a drive scroll unit 6 that is rotatably housed in the housing 4, and the drive scroll unit 6. The driven scroll unit 7 defines the compression spaces 8 and 9.

  The housing 4 connects the first housing 41 to which the electric motor 2 is fixed, the second housing 42 provided to face the first housing 41, and the first housing 41 and the second housing 42. The third housing 43 has a substantially cylindrical shape, and the third housing 43 is formed with an introduction port 44 through which a fluid is introduced.

  The drive scroll unit 6 includes first and second drive scroll members 61 and 62. For example, as shown in FIG. 2, the first drive scroll member 61 is coupled to the rotary shaft 20 of the electric motor 2 via a coupling and is rotatably supported by the first housing 41 via a bearing 31. A first rotating shaft 63, a first end plate 64 extending in a disk shape in the radial direction from the first rotating shaft 63, and a second drive scroll member 62 of the first end plate 64. And a first driving wrap portion 65 that spirally extends from the center of the first end plate 64 to the vicinity of the outer periphery. In addition, an Oldham ring groove 35 a is formed on the rear surface of the end plate 64 so as to mesh with an Oldham ring as the rotation synchronization mechanism 35.

  The second driving scroll member 62 is rotatably supported by the second housing 42 via a bearing 32 and has a second rotating shaft 67 having a discharge hole 66 formed therein, and the second rotating shaft 67. Of the second end plate 68 on the surface facing the first drive scroll member 61 of the second end plate 68 and the second end plate 68 extending radially from the rotary shaft 67 of the second end plate 68. The second drive wrap portion 69 extends spirally from the center to the vicinity of the outer periphery.

  Further, as shown in FIG. 4, the first and second driving scroll members 61 and 62 are held and fixed at predetermined intervals by support pins 21, 22 and 23. The support pins 21, 22, and 23 are bosses that project in an arc shape on the outer peripheral portions of the first and second end plates 64 and 68 of the first and second drive scroll members 61 and 62 (FIG. 2 ( The first end plate 64 in a) is fixed to 24, 25, 26) by bolts. 2A and 2C, the mounting holes through which the bolts are inserted are shown as 21a, 22a, and 23a.

  Further, in the first and second driving scroll members 61 and 62, rib portions 64a are formed on the outer peripheral portions of the respective driving scroll members 61 and 62. The radial thickness Wd of the rib portion 64a is such that the rotational center Cd of the first and second drive scroll members 61, 62 is the first and second drive laps of the first and second scroll members 61, 62. The center of gravity biased by the portions 65 and 69 is adjusted to coincide with the rotation center C. This can be achieved, for example, by changing the positions of the outer diameter center and the inner diameter center of the rib portion 64a. As a result, the rotation center Cd and the center of gravity of the drive scroll unit 6 fixed by the support pins 21, 22, and 23 can be made to coincide with each other, so that smooth rotation can be obtained.

  The driven scroll unit 7 is fixed to the driven scroll member 70 and the outer peripheral portion of the driven scroll member 70, and holds the driven scroll member 70 rotatably with respect to the first housing 41 and the second housing 42. The first and second driven scroll receivers 81 and 82 are configured. As shown in FIGS. 3A, 3B, and 3C, the driven scroll member 70 includes an end plate 71 extending in a disk shape in the radial direction and first and first ends from both sides of the end plate 71, respectively. Provided on the side of the two driving scroll members 61, 62, and first and second driven wrap portions 72, 73 meshing with the first and second driving lap portions 65, 69, respectively, and further supporting the support Openings 75, 76, and 77 are formed at positions corresponding to the pins 21, 22, and 23. One of the openings 75, 76, 77 is provided in the vicinity of the winding end φend of the first and second driven wrap portions 72, 73, and the other two are 120 at the center of the base circle R, respectively. They are arranged on concentric circles so as to be equally divided, and are further formed so that the outer diameter of the driven scroll member 70 becomes smaller. Furthermore, a through-hole 78 is formed in the central portion of the driven scroll member 70 so that the fluid compressed in the first compression space 8 can merge with the fluid compressed in the second compression space 9. It is what.

  The openings 75, 76, 77 have an area substantially equal to the turning range of the support pins 21, 22, 23. In the present invention, as shown in FIG. It is desirable to form 22 and 23 so as not to contact the periphery of the openings 75, 76 and 77. Therefore, when the diameter of the openings 75, 76, 77 is φD, the turning radius is R, the support pin diameter is φd, and the contact prevention gap is α, it is desirable that φD = (R + d / 2 + α) × 2. It is.

  Furthermore, the outer periphery of the driven scroll member 70 is reinforced at the outer periphery of the driven scroll member 70 on which outer peripheral ribs 74 are formed. On the outer peripheral rib 74 of the driven scroll member, the outer diameter of the driven scroll member 70 is made as small as possible corresponding to the openings 75, 76, 77, and the first and second drive scroll members 61, 62 are formed. Arc-shaped cutout portions 90, 91, 92, 93, 94, 95 for allowing the boss portions 24, 25, 26 to escape so as not to interfere with each other are formed on both sides of the outer peripheral rib 74. Furthermore, an escape groove 96 for reducing the weight of the outer peripheral portion is formed on the outer peripheral rib 74 along the outer periphery, and the suction groove 96 and the cutout portions 90 to 95 are communicated with each other to thereby suck in three places. The mouths 101, 102, and 103 are formed.

  Further, in the present invention, the radial thickness Wf of the outer peripheral rib 74 of the driven scroll member 70 is changed so that the center of gravity of the driven scroll member 70 coincides with the rotation center Cf. As in the case of the driving scroll member 61, this can be achieved by changing the positions of the outer diameter center and the inner diameter center of the outer peripheral rib 74, for example. Thereby, the deviation of the center of gravity by the driven lap portions 72 and 73 can be adjusted by changing the thickness Wf of the outer peripheral rib 74 without using a balance weight. Further, since the rotation of the driven scroll member 70 can be stabilized, the load applied to the bearings 33 and 34 that hold the driven scroll receivers 81 and 82 can be equalized.

  The driven scroll member 70 is rotatable to the first and second housings 41 and 42 via bearings 33 and 34 by first and second driven scroll receivers 81 and 82 that hold the outer peripheral rib 74 from both sides. To be held. Basically, the first and second driven scroll receivers 81 and 82 hold the driven scroll member 70 by bolts or the like penetrating the outer peripheral rib 74. In addition, Oldham rings 35 and 36 are arranged between the driven scroll receivers 81 and 82 and the first and second drive scroll members 61 and 62 as a rotation synchronization mechanism, respectively.

  Further, in the scroll fluid machine 1 according to the present invention, the first and second driving wrap portions 65 and 69, the tip portions of the first and second driving wrap portions 65 and 69, the contact portion with the end plate 71, and the first and second driven wrap portions 72 and 73, A tip seal is disposed at a contact portion with the first and second end plates 64 and 68. In the present invention, since the thrust load is offset by the support pins 21, 22, and 23, these chip seals can be slid with an equal contact force. It can be maintained.

  As described above, the scroll fluid machine 1 according to the present invention has a minimum outer diameter, and the rotation center of the rotary element, for example, the drive scroll unit 6 and the driven scroll member 70 coincides with the center of gravity. Is smooth and can reduce the centrifugal force applied to the outer peripheral portion, and can be reinforced by the outer peripheral rib. Therefore, the rotational speed can be improved, and the discharge amount can be increased. .

DESCRIPTION OF SYMBOLS 1 Scroll fluid machine 2 Electric motor 3 Compression part 4 Housing 6 Drive scroll unit 7 Driven scroll unit 8, 9 Compression space 21, 22, 23 Support pin 31, 32, 33, 34 Bearing 41 1st housing 42 2nd housing 43 Third housing 61 First driving scroll member 62 Second driving scroll member 63 First rotating shaft 64 First end plate 65 First driving lap portion 66 Discharge hole 67 Second rotating shaft 68 Second End plate 69 Second driving lap portion 70 Driven scroll member 71 End plate 72 First driven lap portion 73 Second driven lap portion 75, 76, 77 Opening portion 78 Communication port 81 First driven scroll receiver 82 Second Followed scroll receiver 101,102,103 Suction port

Claims (4)

A housing, a drive scroll unit rotatably supported by the housing, a driven scroll unit disposed in the drive scroll unit and changing a volume of a compression space formed between the drive scroll unit and the driven scroll unit; In a scroll fluid machine comprising a rotation synchronization mechanism for rotating the scroll unit together with the drive scroll unit to perform a turning motion relative to the drive scroll unit,
The drive scroll unit includes a pair of drive scroll members disposed so as to sandwich the driven scroll unit, and each drive scroll member is rotatably supported by the housing. An end plate extending in the radial direction, and a driving lap portion extending in the axial direction from the end plate and spirally extending from the center of the end plate in the outer peripheral direction;
The driven scroll unit includes an end plate disposed between the pair of drive scroll members, and a pair of driven laps extending from the end plate to both sides in the axial direction and meshing with the respective drive lap portions to define a compression space. A driven scroll member having a portion, and a pair of driven scroll receivers that rotatably hold the driven scroll member on the housing from the outside of the respective drive scroll members; and
The pair of drive scroll members are fixed by a plurality of support pins that connect the vicinity of the outer periphery of each of the drive scroll members at a predetermined interval, and the support pins pass through the driven scroll member, and the support pins rotate. A scroll fluid machine, wherein an opening having an opening area in a range is formed at a position corresponding to the support pin.   The scroll fluid machine according to claim 1, wherein one of the openings is positioned in the vicinity of a winding end of the driven wrap portion.   An outer peripheral rib is formed on an outer peripheral portion of the driven scroll member, and the radial thickness of the outer peripheral rib is adjusted so that the center of rotation and the center of gravity of the driven scroll member coincide with each other. The scroll fluid machine according to 1 or 2.   An outer peripheral rib is formed on an outer peripheral portion of each driving scrur member, and the radial thickness of the outer peripheral rib is adjusted so that the center of rotation and the center of gravity of the driving scroll member coincide with each other. Item 4. The scroll fluid machine according to any one of Items 1 to 3.

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