JP6005493B2 - Scroll type fluid machinery - Google Patents

Description

  The present invention relates to a scroll type fluid machine, and more particularly to a scroll type fluid machine suitable for use as a compressor-integrated expander.

  As a conventional scroll type fluid machine, for example, a scroll type fluid machine described in Patent Document 1 is known. A scroll type fluid machine described in Patent Document 1 includes a movable scroll in which a spiral wrap is formed, a fixed scroll in which a spiral wrap meshing with the wrap of the movable scroll, and a movable scroll as a drive shaft. And a support part that supports a revolving orbiting movement about the axis of the fixed scroll, and the operation area between the spiral scroll of the fixed scroll and the spiral scroll of the movable scroll is divided into a compression operation area and an expansion operation area by a partition wall. It is configured by partitioning to form a compression part and an expansion part. In this scroll type fluid machine, the drive shaft is rotated by a drive source such as an electric motor to revolve the movable scroll.

Japanese Patent No. 4026747

  By the way, in this type of scroll type fluid machine, the drive shaft is not fixed to the main frame, and the structure is easy to hit the main frame etc. during the revolving orbiting motion of the movable scroll. There is a problem that it may be On the other hand, in the case of a scroll type fluid machine having a configuration in which a support portion is pivotally supported on a fixed shaft fixed to the main frame, and the movable scroll is supported via the support portion so as to be capable of revolving and turning, the above problem is solved.

  However, in the above scroll type fluid machine having a drive shaft, when scroll centering is performed, the movable scroll can be rotated by rotating the drive shaft to position the fixed scroll. In the above-described scroll type fluid machine, it is difficult to rotate the movable scroll at the time of scroll centering, and a device is required.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a scroll type fluid machine capable of easily performing scroll centering.

  For this reason, the scroll type fluid machine according to the present invention includes a fixed scroll and a movable scroll each having a spiral wrap formed thereon, the wraps of the fixed scroll being opposed to each other, and the scroll and the movable scroll of the fixed scroll. A scroll unit that forms a working chamber of a working fluid between the vortex wrap and a fixed shaft, and is pivotally supported by the fixed shaft so that the movable scroll can revolve around the axis of the fixed shaft. And a support portion for supporting the support portion, wherein the support portion is provided with an engagement hole capable of engaging a jig for rotating the support portion, and the engagement hole is provided in the engagement hole. The movable scroll is configured to be revolved around the axis of the fixed shaft by engaging the jig.

According to the scroll type fluid machine of the present invention, the movable scroll is moved by engaging the engaging hole provided in the support portion of the movable scroll and rotating the support portion. Since it is configured to be capable of revolving around the axis of the fixed shaft, the movable scroll can be easily rotated when centering the scroll when the movable scroll and the fixed scroll are assembled and assembled.
In this way, it is possible to provide a scroll type fluid machine that can easily perform scroll centering.

1 is a longitudinal sectional view of a scroll type fluid machine according to a first embodiment of the present invention. It is the top view which looked at the fixed scroll of FIG. 1 from the movable scroll side. It is the top view which looked at the movable scroll of FIG. 1 from the fixed scroll side. It is a perspective view of the eccentric bush of FIG. It is sectional drawing of the jig | tool for rotation operation in this embodiment. It is explanatory drawing of the scroll centering method of the scroll type fluid machine of FIG. It is a longitudinal cross-sectional view of the scroll type fluid machine which concerns on 2nd Embodiment of this invention. It is explanatory drawing of the scroll centering method of the scroll type fluid machine of FIG.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a longitudinal sectional view of a compressor-integrated expander 100 that is a first embodiment of a scroll type fluid machine to which the present invention is applied.
In FIG. 1, a compressor-integrated expander 100 is connected to a refrigeration circuit (evaporator and condenser) (not shown), and revolves and drives the movable scroll by the expansion energy of the taken refrigerant. The refrigerant is compressed by a driving force and discharged, and includes an expansion part 1 and a compression part 2 as working chambers. The inflating part 1 and the compressing part 2 will be described in detail later.

  As shown in FIG. 1, the compressor-integrated expander 100 includes a housing 10. The housing 10 mainly supports a scroll unit 20 including a fixed scroll 3 and a movable scroll 4, and the movable scroll 4. The supporting part 30 is disposed.

  The housing 10 includes a main frame 11 that fixes and supports the fixed scroll 3, a cap-shaped top shell 12 that closes the upper portion of the main frame 11, and a cap-shaped bottom shell 13 that closes the lower portion of the main frame 11. The main frame 11 is sandwiched between the top shell 12 and the bottom shell 13.

  On the top shell 12 side, as schematically shown in FIG. 1, an expansion side suction pipe 14 for allowing the refrigerant from the refrigeration circuit to flow into the expansion section 1 and the refrigerant expanded in the expansion section 1 are supplied to the refrigeration circuit. An expansion-side discharge pipe 15 that discharges toward the outlet and a compression-side discharge pipe 16 that discharges the refrigerant compressed by the compression unit 2 toward the refrigeration circuit are disposed. The expansion side suction pipe 14 and the expansion side discharge pipe 15 are respectively connected to the expansion side suction chamber 3d and the expansion side discharge chamber 3e formed in the fixed scroll 3, and the compression side discharge pipe 16 is connected to the top shell 12 and the main frame. 11 is connected to a compression-side discharge chamber 12a formed between them. In addition, a compression side suction pipe 17 for allowing the refrigerant taken in from the refrigeration circuit to flow into the compression section 2 is arranged on the outer peripheral side of the main frame 11, and the compression side suction pipe 17 is formed in the fixed scroll 3. It is connected to the compression side suction chamber 3f.

  The scroll unit 20 includes a fixed scroll 3 and a movable scroll 4 formed with spiral wraps 3L and 4L (see FIGS. 2 and 3), respectively, with the wraps 3L and 4L facing each other. The scroll unit 20 forms the expansion part 1 and the compression part 2 (refer FIG. 1) which comprise the working chamber of a working fluid between the wrap 3L and the wrap 4L.

  As shown in FIG. 1, the fixed scroll 3 is fixed to the uppermost seat surface 11a1 of the stepped recess 11a formed in the main frame 11 with the lap forming surface side facing downward. As shown in FIG. 2, the fixed scroll 3 is formed with an inner wrap 3La and an outer wrap 3Lb as spiral wraps 3L, and an annular intermediate partition wall 3a and an outer partition wall 3b are erected. . The inner wrap 3La is erected more centrally than the intermediate partition wall 3a, and the outer wrap 3Lb is erected between the intermediate partition wall 3a and the outer partition wall 3b. Further, the fixed scroll 3 is formed with an annular groove 3c (see FIG. 2) into which the seal ring 5 (see FIG. 1) is inserted in the end face of the intermediate partition wall 3a.

  Further, as shown in FIG. 2, the fixed scroll 3 has an expansion side suction chamber 3d formed in a central portion which is an inner peripheral end of the expansion portion 1, and an expansion side discharge chamber 3e is expanded inside the intermediate partition wall 3a. The compression side suction chamber 3f is formed at the outer peripheral end of the compression part 2 inside the outer partition wall 3b, and the compression side discharge is formed at the inner peripheral end of the compression part 2 outside the intermediate partition wall 3a. A hole 3g is formed therethrough.

  The movable scroll 4 is placed on the intermediate pedestal surface 11a2 of the main frame 11 with the lap forming surface facing upward while being rotated by a rotation prevention mechanism 50 such as an Oldham ring. It is supported so as to be capable of revolving and turning around the axis of a fixed shaft 6 to be described later. As shown in FIG. 3, the movable scroll 4 is formed with an inner wrap 4La and an outer wrap 4Lb as spiral wraps 4L. The wall surface of the inner wrap 4La faces the wall surface of the inner wrap 3La of the fixed scroll 3, the wall surface of the outer wrap 4Lb faces the wall surface of the outer wrap 3Lb of the fixed scroll 3, and the wraps 4La and 4Lb have opposite spirals. Standing in the direction. Further, as shown in FIG. 1, a concave portion 4 a into which an eccentric bush 31 (described later) is inserted so as to be rotatable relative to the movable scroll 4 is formed on the surface opposite to the wrap formation surface of the movable scroll 4.

  As shown in FIG. 1, the fixed scroll 3 and the movable scroll 4 are combined so that the wall surfaces of the respective wraps face each other, and the inflating portion 1 is provided between the inner wrap 3La of the fixed scroll 3 and the inner wrap 4La of the movable scroll 4. , And the compression portion 2 is formed between the outer wrap 3Lb of the fixed scroll 3 and the outer wrap 4Lb of the movable scroll 4. As described above, the scroll unit 20 according to the present embodiment is a so-called single unit in which the pair of the fixed scroll 3 and the movable scroll 4 that face the wall surfaces of each lap form the expansion portion 1 and the compression portion 2 as the refrigerant working chamber. It is a plate-type scroll unit.

  The support portion 30 is pivotally supported on the fixed shaft 6 and supports the movable scroll 4 so as to be capable of revolving around the axis X1 of the fixed shaft 6. Specifically, the support portion 30 includes an eccentric bush 31, a needle bearing 32, a radial bearing 33, and a thrust bearing 34.

  The eccentric bush 31 is pivotally supported by the fixed shaft 6 so as to be eccentric and rotatable with respect to the axis X 1 of the fixed shaft 6, and is relatively rotated with respect to the movable scroll 4 in a recess 4 a formed in the movable scroll 4. Interpolated as possible.

  Specifically, as shown in FIG. 4, the eccentric bush 31 includes a flange portion 31 a that is larger than the inner diameter of the concave portion 4 a of the movable scroll 4, and a columnar portion 31 b that is erected from the center of the flange portion 31 a. The balance weight 31c is formed integrally with a part of the outer peripheral portion of the flange portion 31a. The cylindrical portion 31b has a hole portion 31d having a central axis that is eccentric with respect to the axis X3 of the cylindrical portion 31b and coincides with the axis X1 of the fixed shaft 6, and is eccentric with respect to the axis X1 of the fixed shaft 6. It is formed so that it can be assembled with heart. A shaft portion 6a (see FIG. 1) of the fixed shaft 6 is fitted into the hole portion 31d via a needle bearing 32, and the eccentric bush 31 is pivotally supported by the fixed shaft 6. The cylindrical portion 31 b is inserted into the concave portion 4 a of the movable scroll 4 via the radial bearing 33. A thrust bearing 34 is disposed between the flange portion 31a and the base portion 6b of the fixed shaft 6 (see FIG. 1).

  As shown in FIG. 1, the fixed shaft 6 has a shaft portion 6 a on the upper end side, a base portion 6 b fitted into a hole portion 11 c formed so as to penetrate the bottom portion of the main frame 11, and a diameter expanded on the lower end side. The shaft portion 6a and the base portion 6b are formed coaxially (X1). For example, the base 6b is fitted into the hole 11c and the flange 6c is bolted to the lower surface of the main frame 11 to fix the axis X1 of the fixed shaft 6 to the central axis X2 of the fixed scroll 3. These are fixed and fixed to the main frame 11. That is, the fixed shaft 6 only supports the eccentric bush 31 so as to be rotatable, and does not rotate itself.

  As described above, the support portion 30 including the eccentric bush 31, the needle bearing 32, the radial bearing 33, and the thrust bearing 34 fixes the cylindrical portion 31 b of the eccentric bush 31 that is pivotally supported on the fixed shaft 6 via the needle bearing 32. 6 is eccentric with respect to the axial center X1, and the cylindrical portion 31b is inserted into the concave portion 4a of the movable scroll 4 through the radial bearing 32 so as to be rotatable relative to the movable scroll 4, thereby moving the movable scroll. 4 is supported so as to be capable of revolving around the axis X1.

  Further, an operation jig 60 as a jig for rotating the eccentric bush 31 can be engaged with the eccentric bush 31 of the support section 30 through, for example, a projection 60c (see FIG. 5). An engaging hole 31e (see FIG. 1) is provided in the flange portion 31a, and the protrusion 60c is engaged with the engaging hole 31e so that the movable scroll 4 is revolved around the axis X1 of the fixed shaft 6. It is configured to be possible. As shown in FIG. 5, the operation jig 60 is formed on the upper end side shaft portion 60a, the base portion 60b fitted into the hole 11c of the main frame 11, and the end surface of the base portion 60b on the shaft portion 60a side. The projection 60c and the engagement hole 60d formed in the rear end surface of the base 60b are provided.

  Next, a scroll centering method of the compressor-integrated expander 100 of this embodiment will be schematically described with reference to FIG. The fixed scroll 3 is not fixed to the main frame 40 before scroll centering.

First, preparation for scroll centering will be described.
As shown in FIG. 6, by inserting the base portion 60 b of the operation jig 60 shown in FIG. 5 into the hole portion 11 c of the main frame 11 and inserting the shaft portion 60 a into the hole portion 31 d of the eccentric bush 31. The eccentric bush 31 is pivotally supported instead of the fixed shaft 6, and the protrusion 60c formed on the operation jig 60 is fitted into the engagement hole 31e to be engaged. Then, the square pin 61 a on the operation handle 61 side is fitted into the engagement hole 60 d formed at the end of the operation jig 60.

  When the operation handle 61 is sequentially rotated to, for example, 90 °, 180 °, 270 °, and 360 ° rotation positions after the preparation for scroll centering is completed, the eccentric bush 31 rotates and the movable scroll is moved. 4 revolves around the axis X1 of the fixed shaft 6 to the respective rotational positions. At each of these rotational positions, the fixed scroll 3 is moved in the X direction (see FIG. 1) or the Y direction (perpendicular to the paper surface in FIG. 1), and the wall surface of the wrap 3L of the fixed scroll 3 is moved to the wrap 4L of the movable scroll 4. The position (coordinates) of each fixed scroll 3 after being moved is brought into contact with the wall surface and measured. Next, based on the position measurement results at these rotational positions, the minimum clearance between the laps 3L and 4L in the + X direction is equal to the minimum clearance between the laps 3L and 4L in the -X direction, and + Y The fixed scroll 3 is moved so that the minimum clearance between the laps 3L and 4L in the direction is equal to the minimum clearance between the laps 3L and 4L in the -Y direction. In this way, the fixed scroll 3 is positioned with reference to the orbiting scroll 4, and in this state, the fixed scroll 3 is fixed to the main frame 11, and the scroll centering is completed.

  Next, the operation after centering of the compressor-integrated expander 100 of the present embodiment will be schematically described with reference to FIG.

  The high-pressure refrigerant sucked from the expansion side suction pipe 14 is taken into the expansion part 1 through the expansion side suction chamber 3d. The expansion unit 1 increases the volume between the scrolls 3 and 4, and continuously orbits the movable scroll 4 around the axis X <b> 1 of the fixed scroll 3 by the expansion energy of the refrigerant. The refrigerant used for the revolving turning motion of the movable scroll 4 is discharged toward the refrigeration circuit via the expansion side discharge chamber 3e and the expansion side discharge pipe 15. On the other hand, the low-pressure refrigerant sucked from the compression side suction pipe 17 is taken into the compression unit 2 through the compression side suction chamber 3f. The compression unit 2 reduces the volume between the scrolls 3 and 4 by the revolving orbiting motion of the movable scroll 4 and compresses the refrigerant taken in along with this. The compressed refrigerant is discharged toward the refrigeration circuit via the compression side discharge hole 3g, the compression side discharge chamber 12a, and the compression side discharge pipe 16. Thus, the scroll unit 20 is driven by the expansion energy of the refrigerant, and the compression energy of the refrigerant is generated by the driving force of the scroll unit 20.

According to the compressor-integrated expander 100 of this embodiment, the operation jig 60 is engaged with the engagement hole 31 e provided in the support portion 30 of the movable scroll 4 to rotate the support portion 30. As a result, the movable scroll 4 is configured to be capable of revolving around the axis of the fixed shaft 6, so that the movable scroll 4 can be easily rotated when centering the scroll when the movable scroll 4 and the fixed scroll 3 are assembled and assembled. Can be operated.
In this way, it is possible to provide a scroll type fluid machine that can easily perform scroll centering.

  FIG. 7 is a longitudinal sectional view of a compressor-integrated expander 100 that is a second embodiment of the scroll type fluid machine to which the present invention is applied. In addition, the same code | symbol is attached | subjected to the element same as 1st Embodiment of FIG. 1, description is abbreviate | omitted, and only a different part is demonstrated.

  In the present embodiment, the fixed shaft 6 has a through hole 6d formed in the base 6b. An engagement pin 70 as an operation jig is configured to be engageable with the engagement hole 31e through the through hole 6d. In the present embodiment, the engagement pin 70 is fixed to the base 71a of the operation handle 71, and is fitted into the engagement hole 31e via the through hole 6d in this state. The operation handle 71 is fixed to the flange portion 6c of the fixed shaft 6 with a bolt or the like through the base portion 71a.

  Next, a scroll centering method of the compressor-integrated expander 100 of this embodiment will be schematically described with reference to FIG. Note that the content after the preparation for scroll centering is completed is the same as that in the first embodiment, and thus the description is simplified. Further, the operation after the centering of the scroll of the scroll type fluid machine of the present embodiment is the same as that of the first embodiment, and thus the description thereof is omitted.

  First, the outer diameter of the base portion 6 of each of the fixed shafts 6 that are in stock as assembly parts is measured. On the other hand, one main frame 11 used for assembly is prepared, and the inner diameter of the hole 11c of the main frame 11 is measured. Then, for example, one of the fixed shafts 6 having an outer diameter that minimizes the clearance from the inner diameter of the hole 11c is selected from those prepared as a plurality of assembly parts. Then, as shown in FIG. 7, the fixed shaft 6 having the optimum outer diameter of the base portion 6 is fitted into the hole portion 11 c of the main frame 11, and the shaft portion 6 a is inserted into the hole portion 31 d of the eccentric bush 31 to be eccentric. The bush 31 is pivotally supported. Then, the engagement pin 70 is inserted into the engagement hole 31 e through the through hole 6 d formed in the fixed shaft 6. Then, the base portion 71 a of the operation handle 71 to which the engagement pin 70 is fixed is fixed to the flange portion 6 c of the fixed shaft 6. After completion of the preparation for scroll centering, the movable scroll 4 is revolved to each rotational position by rotating the operation handle 71, and the wall surface of the lap 3L is brought into contact with the wall surface of the lap 4L at each rotational position. The position of each fixed scroll 3 at is measured. Next, the fixed scroll 3 is positioned and fixed to the main frame 11 based on the position measurement result at each rotational position, and the scroll centering is completed.

  According to the compressor-integrated expander 100 of this embodiment, the through hole 6d is formed in the fixed shaft 6, and the engagement pin 70 can be engaged with the engagement hole 31e through the through hole 6d. Therefore, the fixed shaft 6 as a product part can be used from the time of scroll centering. Accordingly, the operator does not need to replace the shaft by inserting the operation jig 60 during the centering of the scroll and inserting the fixed shaft 6 after the centering is completed as in the first embodiment. Compared to the embodiment, the scroll centering operation can be easily performed.

  Further, as in this embodiment, by using the fixed shaft 6 and the main frame 11 selected in combination so that the clearance between the outer diameter of the base portion 6b and the inner diameter of the hole portion 11c is minimized, the base portion of the fixed shaft 6 is used. Since the amount of runout of the fixed shaft 6 during the centering of the scroll can be suppressed without increasing the dimensional tolerance of the outer diameter of 6b and the hole diameter of the hole 11c of the main frame 11, the centering can be performed without increasing the processing cost. Accuracy can be improved.

  Moreover, in the said 1st and 2nd embodiment, although demonstrated in the case where the needle bearing 32 and the radial bearing 33 were provided between the eccentric bush 31, the recessed part 4a, and the axial part 6a, it is not restricted to this, Instead of providing the bearings 32 and 33, the eccentric bush 31 itself may be a sliding bearing that receives the relative rotation of the movable scroll 4 and the shaft portion 6a.

  Furthermore, in the first and second embodiments described above, the fixed shaft 6 is fixed to the main frame 11 with its axis X1 substantially aligned with the center axis X2 of the fixed scroll 3, but this is not limited to this. Not limited to this, the axis X1 may be fixed while being shifted from the center axis X2 of the fixed scroll 3. In this case, in the centering of the scroll, the fixed scroll 3 is located at a position determined based on the position measurement result at each rotational position described above and the intended eccentric amount and eccentric direction between the axis X1 and the center axis X2. 11 to be fixed.

  Although the description of the embodiment of the present invention is finished above, the present invention is not limited to the first and second embodiments, and various modifications can be made without departing from the spirit of the present invention. .

100 ... Scroll type fluid machine (compressor-integrated expander)
1 ... Expansion part (working chamber)
2 ... Compression section (working chamber)
3... Fixed scroll 3 L... Spiral wrap 4... Movable scroll 4 a... Recessed 4 L... Spiral wrap 6. ... through-hole 20 ... scroll unit 30 ... support part 31 ... eccentric bush 31e ... engagement hole 60 ... operation jig (jig for rotation operation) )
70... Engaging pin (jig for rotating operation)

Claims (3)

A fixed scroll and a movable scroll, each of which has a spiral wrap formed thereon, are provided with the wraps facing each other, and a working fluid working chamber is provided between the spiral wrap of the fixed scroll and the spiral wrap of the movable scroll. A scroll-type fluid comprising: a scroll unit to be formed; a fixed shaft; and a support portion that is pivotally supported by the fixed shaft and supports the movable scroll so as to be capable of revolving around the axis of the fixed shaft. A machine,
The support portion is provided with an engagement hole capable of engaging with a jig for rotating the support portion, and the jig is engaged with the engagement hole so that the movable scroll is fixed to the axis of the fixed shaft. A scroll-type fluid machine that can revolve around its core.   The scroll type fluid machine according to claim 1, wherein a through hole is formed in the fixed shaft, and the jig can be engaged with the engagement hole through the through hole.   The support portion is pivotally supported by the fixed shaft so as to be rotatable eccentrically with respect to the shaft center of the fixed shaft, and the movable scroll is formed in a recess formed on a surface opposite to the wrap forming surface of the movable scroll. The scroll type fluid machine according to claim 1, wherein the scroll type fluid machine is configured to include an eccentric bush that is inserted so as to be capable of relative rotation.