JP7063461B2 - Scroll expander - Google Patents

Description

The present invention is composed of a drive scroll and a driven scroll that rotates with the rotation of the drive scroll, and the expansion of the inflowing steam changes the volume of the space defined by the drive scroll and the driven scroll to obtain a driving force. Regarding the scroll expander to get.

Patent Document 1 (Japanese Unexamined Patent Publication No. 2002-156163) describes a compressor, a gas cooler that condenses the CO2 refrigerant compressed by the compressor, a depressurizing means for depressurizing the CO2 refrigerant condensed in the gas cooler, and a depressurizing means. In an air conditioner including an evaporator for evaporating the CO2 refrigerant, an air conditioner using an expander that positively expands and depressurizes the CO2 refrigerant is disclosed as a decompression means, and a scroll expander is used as the expander. Disclose what to do.

Patent Document 2 (Japanese Unexamined Patent Publication No. 2013-227906) discloses a birotary scroll expander suitable for expanding steam. The scroll expander disclosed in Patent Document 1 includes a first drive scroll, a second drive scroll, a driven scroll, a rotating mechanism that rotatably supports the driven scroll, and a first drive scroll and a second drive scroll. It has a swivel mechanism that connects the driven scroll so that it can be swiveled relatively, and the swivel mechanism is between the first drive end plate of the first drive scroll and the first driven arm of the rotary mechanism, and the second drive scroll. A plurality of metal swivel pins provided between the two drive end plates and the second driven arm of the rotation mechanism, and swivel pins provided corresponding to each of the swivel pins and corresponding to each other are eccentrically connected. It has multiple swivel discs made of metal. In the scroll expander of Patent Document 1, since the swivel pin and the swivel disk of the swivel mechanism are each made of metal and have high heat resistance, they have a long life even when applied to expansion of steam, for example, and the first drive scroll and the first drive scroll and the first. It is disclosed that the driven scroll smoothly turns with respect to the two-drive scroll, so that the rotational force output to the outside from the first drive shaft is improved.

In Patent Document 3 (Japanese Unexamined Patent Publication No. 2016-164381), a working fluid flowing in a supply path is supplied to a scroll expander to drive the scroll expander, thereby driving an induction generator connected to the scroll expander. The power generator to be used is disclosed.

The scroll expander disclosed in Patent Document 4 (Japanese Unexamined Patent Publication No. 2018-44543) is arranged in a housing provided with an intake port for cooling air and an exhaust port for cooling air, and inside the housing, and is arranged on a swivel side. A swirl scroll with a swirl-shaped swivel wrap on the plate surface of the board, and a swirl-shaped fixed wrap that is placed facing the swivel scroll inside the housing and meshes with the swirl wrap on the plate surface of the fixed side end plate. As a fixed scroll that introduces steam as an expanding fluid, an exhaust temperature sensor that detects the exhaust temperature of the cooling air, and a judgment unit that determines an abnormality based on the change in the exhaust temperature detected by the exhaust temperature sensor. It is equipped with a control device of.

Japanese Unexamined Patent Publication No. 2002-156163 Japanese Unexamined Patent Publication No. 2013-227906 Japanese Unexamined Patent Publication No. 2016-164381 Japanese Unexamined Patent Publication No. 2018-44543

As shown in the patent document described above, the scroll type expander introduces high pressure refrigerant gas, high pressure steam, high pressure air, etc. into the central part of the space defined by the drive scroll and the driven scroll, and the volume is increased. When moving and expanding from the space in the central part with a small volume to the space in the outer peripheral part with a large volume, the axis of rotation is rotated and expanded, and at the same time, it can be used as a power source.

In recent years, with the spread of electric vehicles and the like, instead of simply using an expansion valve as an expansion means for a refrigeration cycle, an expansion machine is used to convert expansion energy into drive energy, and further convert drive energy into electric energy for storage. The system to do is considered. As the inflator in this case, a scroll type inflator is preferable from the viewpoint of low noise, and both include a drive scroll and a driven scroll that rotates with the miniaturization of the inflator itself. It is desirable to use a rotary scroll type inflator.

From the above, it is an object of the present invention to provide a double-rotation type scroll type inflator which is most suitable as an inflator.

The present invention comprises a housing, a pair of rotating shafts rotatably supported by the housing, a pair of drive scroll members fixed to each of the pair of rotating shafts and arranged to face each other, and the same. The pair of drive scrolls are provided with a driven scroll member rotatably sandwiched between the pair of drive scroll members and a driven scroll receiver that rotatably supports the driven scroll member in the housing and eccentrically supports the rotation axis. Each of the members includes a disk-shaped drive unit end plate fixed to the rotation axis, and a pair of drive side wrap portions that are radially spread on the drive unit end plate and arranged point-symmetrically. The driven scroll member includes a disk-shaped driven portion end plate and a pair of driven side wrap portions that are radially spread in a radial direction and arranged point-symmetrically on both sides of the driven portion end plate. Further , the driven scroll member is sandwiched between a pair of drive scroll members to define expansion chambers that expand toward the outer peripheral portion on both sides of the driven portion end plate, and are formed on one of the rotating shafts. It is provided with an inflow port communicating with the central portion of the expansion chamber and an outflow port communicating with the outer peripheral portion of each of the expansion chambers and opening to the driven scroll member, and the fluid flowing from the inflow port flows into the expansion chamber of the expansion chamber. In a scroll type expander that expands while moving from the central portion to the outer peripheral portion to rotate the rotation axis, each of the drive unit end plates is a drive side lap within a predetermined range from the final end portion of the drive side lap portion. A drive-side lap outer peripheral portion having a thickened portion is provided, and an outer peripheral opening into which the drive-side lap outer peripheral portion is inserted is formed in the vicinity of the outermost outer periphery of the driven portion end plate of the driven scroll member. ..

As a result, the strength of the outer peripheral portion of the drive side lap portion of the drive scroll member can be improved, so that the outer peripheral portion of the drive side lap portion can withstand the centrifugal force due to the high-speed rotation of the drive scroll member and the driven scroll member. You will be able to do it . This means that the drive scroll member and the driven scroll member can rotate at high speed.

Further, the drive scroll member is made of an aluminum material, and each of the drive scroll members has a thin drive side end plate and at the same time has a plurality of reinforcing ribs on the back surface side of the drive side end plate, and also has the rotation shaft and the rotation shaft. It is desirable that the flange portion extending in the radial direction is formed of a material having a low thermal conductivity, and the flange portion covers the reinforcing rib.

Further, it is desirable that the drive scroll member is made of an aluminum material in order to reduce the weight. It is desirable to form the drive-side end plate thinly for weight reduction and at the same time to form reinforcing ribs for reinforcement. However, since the cooling action of the reinforcing ribs occurs with the rotation of the drive scroll member, the flange portion extending radially from the rotation axis is formed of a material having low thermal conductivity (for example, stainless steel). It is desirable to cover the reinforcing ribs with.

As a result, the cooling action of the reinforcing ribs can be reduced and the strength of the drive scroll member can be improved, so that the drive scroll member and the driven scroll member can be rotated at high speed, and the cooling effect of the reinforcing ribs can be suppressed. Since the expansion effect of the scroll type inflator according to the present invention can be maintained, the force for rotating the rotation axis of the scroll type inflator can be maintained.

Further, it is a sealing mechanism that communicates with the inflow port formed on the rotating shaft and seals between the cap portion formed in the housing that rotatably holds the rotating shaft, and the sealing mechanism is the rotating. It is composed of a face seal that abuts on the end face of the shaft, a parallel pin that prevents the face seal from rotating with respect to the rotation of the rotating shaft, and an O-ring that prevents leakage. It is desirable to prevent leakage.

As a result, a face seal is incorporated in the cap part that communicates with the inflow port formed on the rotating shaft, rotation is prevented with a parallel pin, and at the same time, leakage is prevented with an O-ring, and a high-pressure inflow fluid (for example, high pressure) entering from the cap side is performed. Since the (refrigerant gas) is pressed against the end face of the face seal rotating shaft to seal it, it is possible to prevent the high-pressure inflow fluid from leaking to the low-pressure side.

Furthermore, the inner diameter portion of the housing facing the outlet formed on the driven scroll member is formed in a tapered shape that is inclined so as to extend from the portion facing the outlet to both sides in the axial direction of the rotation shaft. be.

As a result, the high-pressure inflow fluid flowing into the inflow port of the rotating shaft moves while expanding the expansion chamber whose volume expands toward the outer peripheral portion, and is discharged from the outflow port of the driven scroll member. Since the taper is formed so as to spread from the portion facing the outlet to both sides in the axial direction of the rotating shaft, the discharged fluid tends to spread toward both sides in the axial direction. When the fluid is a refrigerant gas containing lubricating oil, the refrigerant gas discharged by centrifugal force collides with the inner diameter portion of the housing to separate the lubricating oil, and the separated lubricating oil is formed in the tapered inner diameter portion. It is possible to efficiently lubricate the bearing that spreads on both sides along the line and holds the driven scroll member, the driven scroll member, and the driven scroll receiver rotatably.

Further, on the rotation shaft side where the inflow port is not formed, it is desirable that the outer diameter of the bearing that rotatably holds the rotation shaft is smaller than the inner diameter of the driven scroll receiver that rotatably holds the driven scroll member.

This makes it possible to easily assemble the scroll type inflator according to the present invention.

The scroll type expander according to the present invention having the above configuration has a structure that enables high-speed rotation of the drive scroll member and the driven scroll member, and reliably converts the expansion of the high-pressure inflow fluid into the rotation of the rotating shaft. It is possible to efficiently discharge the expanded fluid.

FIG. 1 is a cross-sectional view of a scroll type inflator according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of a drive scroll member and a driven scroll member of the scroll type expander according to the embodiment of the present invention. 3A is a front view of the first drive scroll member having a rotation axis on which an inflow port is formed, FIG. 3B is a sectional view thereof, and FIG. 3C is a rear view thereof. Is. 4 (a) is a front view of the second drive scroll member, FIG. 4 (b) is a sectional view thereof, and FIG. 4 (c) is a rear view thereof. 5 (a) is a front view of the driven scroll member of the scroll fluid machine according to the embodiment of the present invention, FIG. 5 (b) is a sectional view thereof, and FIG. 5 (c) is a rear view thereof. 6A is a cross-sectional view of the vicinity of the cap portion of the present invention, FIG. 6B is a plan view of the face seal, and FIG. 6C is a cross-sectional view thereof.

Hereinafter, examples of the present invention will be described with reference to the drawings.

The scroll expander 1 according to the embodiment of the present invention includes, for example, as shown in FIG. 1, a housing 4 that defines an internal space 3 in which an expansion mechanism 2 is arranged. The housing 4 is formed with outlets 41 and 42 communicating with the internal space 3. Further, the housing 4 is composed of two bottomed cylindrical housing members 4a and 4b, and the inner peripheral wall surface 46 of the housing 4 is on the bottomed side (both sides of the drawing) from the joint portion of the two housing members 4a and 4b. It is formed in a tapered shape that inclines so as to expand in diameter. Further, a cap portion 43 having a through hole 44 communicating with the inlet 55 of the rotary shaft 50 described below is fixed to the housing member 4a, and a cap through which the rotary shaft 60 described below penetrates is fixed to the housing member 4b. The portion 45 is fixed.

As shown in FIGS. 1 and 2, for example, the expansion mechanism 2 is fixed to a pair of rotary shafts 50 and 60 rotatably supported by the housing 4 and to each of the pair of rotary shafts 50 and 60. The first and second drive scroll members 5 and 6, the driven scroll member 7 rotatably sandwiched between the first and second drive scroll members 5 and 6, and the driven scroll member 7 are housed in the housing 4. The driven scroll receivers 8 and 9 that are rotatably supported and eccentrically supported with respect to the rotating shaft 50.60, and the rear side and the driven scroll receiver 8 of the first and second drive scroll members 5 and 6. , 9 is composed of an old dam mechanism 10 provided between the inside of each of the 9 and 9. By the Oldham mechanism 10, the driven scroll member 7 makes a turning motion relative to the first and second drive scroll members 5 and 6.

The first drive scroll member 5 is a disk-shaped drive unit end plate 51 formed of an aluminum material, as shown in FIGS. 1 to 3, particularly FIGS. 3 (a), (b), and (c). Equipped. A plurality of reinforcing ribs 52 (shown in FIG. 2) for reinforcing the drive unit end plate 51 are radially formed on the back surface side of the drive unit end plate 51, and extend radially from the rotation shaft 50 in a brim shape. It is covered by the collar 53. The rotating shaft 50 and the flange portion 53 are integrally formed of a material having a low thermal conductivity, for example, stainless steel. Thereby, the cooling action generated by the high-speed rotation of the reinforcing rib 52 can be reduced by covering the cooling action with a rust portion 53 made of a material having a low thermal conductivity, for example, stainless steel.

Further, a ridge 54 forming a part of the Oldham mechanism 10 is formed on the flange portion 53. Further, the drive unit end plate 51 is formed with an opening 56 that communicates with the inflow port 55 that penetrates the rotation shaft 50, and spirally extends from the peripheral edge of the opening 56 on the front side of the drive unit end plate 51. The drive-side lap portions 57 and 58 are formed line-symmetrically. Further, on the outermost peripheral portion of the drive unit end plate 51, a drive side lap outer peripheral portion 59 having a thicker lap width is provided in a predetermined range (a range of about 90 °) from the final end portions of the drive side lap portions 57 and 58. Each is provided to reinforce the outermost peripheral portion of the drive side lap portions 57 and 58.

As shown in FIG. 4, the second drive scroll member 6 includes a disk-shaped drive unit end plate 61 formed of an aluminum material. On the back side of the drive unit end plate 61, a plurality of reinforcing ribs 62 for reinforcing the drive unit end plate 61 are formed radially, and a flange portion 63 extending radially from the rotation shaft 60 (in FIG. 1). It is covered by (shown). The rotating shaft 60 and the flange portion 63 are integrally formed of a material having a low thermal conductivity, for example, stainless steel. As a result, the cooling action generated by the high-speed rotation of the reinforcing rib 62 can be reduced by covering the cooling action with a rust portion 63 made of a material having a low thermal conductivity, for example, stainless steel.

Further, a ridge 64 forming a part of the Oldham mechanism 10 is formed on the flange portion 63. Further, on the front side of the drive unit end plate 51, drive side lap portions 67 and 68 spirally extending from the peripheral edge of the central portion are formed point-symmetrically. Further, on the outermost peripheral portion of the drive unit end plate 61, a drive side lap outer peripheral portion 69 having a thicker lap width is provided in a predetermined range (a range of about 90 °) from the final ends of the drive side lap portions 67 and 68. Each is provided to reinforce the outermost peripheral portions of the drive side lap portions 67 and 68. The drive unit end plate 61 is formed with a recess 60a to which the rotating shaft 60 is mounted.

As shown in FIG. 5, for example, the driven scroll member 7 extends radially on each of a disk-shaped driven portion end plate 70 having an opening 71 in the center and both side surfaces of the driven portion end plate 70. , A pair of driven side laps 72, 73 that are arranged point-symmetrically and mesh with the first drive side laps 57, 58 and a pair of driven side laps that mesh with the second drive side laps 67, 68. Parts 74 and 75 are formed. Further, an outer peripheral opening 76, 77 into which the drive side lap outer peripheral portions 59, 69 of the first and second drive scroll members 5 are inserted is formed in the vicinity of the outermost peripheral portion of the driven portion end plate 70. Further, the outer peripheral end portion of the driven scroll member 7 is fixed to the driven scroll receivers 8 and 9, and rotates eccentrically with respect to the rotating shafts 50 and 60.

With the above configuration, the first and second drive scroll members 5 and 6 are assembled by engaging with the driven scroll member 7 so as to rotatably sandwich the driven scroll member 7, and the driven side end plate 70 of the driven scroll member 7 is assembled. Expansion spaces 11 and 12 are defined on both sides of the scroll. An expansion mechanism 2 including a driven scroll member 7 to which the driven scroll receivers 8 and 9 are fixed and a driven scroll member 5 and 6 fixed to the driven scroll receivers 8 and 9 is mounted on one housing member 4b via bearings 13 and 14, and further to the other housing. The scroll type expander 1 can be assembled by mounting the member 4a via the bearings 15 and 16 and fixing the housing members 4a and 4b.

Further, in the assembled scroll type expander 1, as shown in FIG. 6, it is formed on the housing member 4a that communicates with the inflow port 55 formed in the rotary shaft 50 and rotatably holds the rotary shaft 50. A sealing mechanism for sealing between the cap portion 43 and the cap portion 43 is provided. This sealing mechanism is composed of a face seal 80 that abuts on the end surface of the rotating shaft 50, a parallel pin 81 that prevents the face seal 80 from rotating with respect to the rotation of the rotating shaft 50, and an O-ring 82 that prevents leakage. Therefore, it is possible to prevent the high-pressure fluid flowing from the cap side from leaking to the low-pressure side.

On the rotating shaft 60 side, the outer diameter ΦA of the bearing 13 that rotatably holds the rotating shaft 60 is made smaller than the inner diameter ΦB of the driven scroll receiver that rotatably holds the driven scroll member (ΦA <. ΦB). This makes it possible to easily remove the expansion mechanism 2 from the housing member 4b when the scroll type expander 1 is disassembled.

In the scroll type expander 1 having the above configuration, a high-pressure inflow fluid, for example, a high-pressure refrigerant for an expansion cycle, is introduced from the cap portion 43 to the central portion of the expansion chambers 11 and 12 via the inflow port 55 of the rotary shaft 50. , Moves while expanding in the outer peripheral direction from the central portion of the expansion chambers 11 and 12. At this time, in order to urge the driven side lap portions 72, 73, 74, 75 and the drive side lap portions 57, 58, 67, 68, rotational force is applied to the drive scroll members 5, 6 and the drive scroll member 7. It is a thing. Further, the inflow fluid expands to a low pressure and is discharged from the discharge ports 78 and 79 formed on the outer peripheral portion of the driven scroll member 7 toward the inner peripheral wall surface 40 of the housing 4, and the inner peripheral wall surface 40 is tapered. It is moved along the plane to both sides of the drawing and is sent out from the internal space 3 of the housing 4 to the outside or downstream of the expansion cycle from the outlets 41 and 42. This makes it possible to expand the inflowing high-pressure inflow fluid.

Further, since the rotating shaft 60 can be rotated by this, power can be generated by connecting a generator to the rotating shaft 60, for example.

1 Scroll type expander 2 Expansion mechanism 3 Internal space 4 Housing 5 First scroll member 6 Second scroll member 7 Driven scroll member 8, 9 Driven scroll receiver 10 Oldam mechanism 11, 12 Expansion chamber
40 Inner wall
43 Cap part
50,60 Rotating shaft 51,61 Drive part end plate 52,62 Reinforcing rib 53,63 Collar part 54 Protrusion 55 Inlet 56 Opening part 57, 58, 67, 68 Drive side wrap part 59, 69 Drive side lap outer circumference 70 Driven side end plate 71 Opening 72,73,74,75 Driven side wrap
80 face seal
81 Parallel pins
82 O-ring

Claims (5)

A housing, a pair of rotating shafts rotatably supported by the housing, a pair of drive scroll members fixed to each of the pair of rotating shafts and arranged facing each other, and the pair of drive scrolls. Each of the pair of drive scroll members includes a driven scroll member that is rotatably sandwiched between the members and a driven scroll receiver that rotatably supports the driven scroll member in the housing and eccentrically supports the rotation axis. The driven scroll is provided with a disk-shaped drive unit end plate fixed to the rotation shaft and a pair of drive side wrap portions that are radially spread on the drive unit end plate and arranged point-symmetrically. The member includes a disk-shaped driven portion end plate and a pair of driven side wrap portions that are radially spread in a radial direction and arranged point-symmetrically on both sides of the driven portion end plate, and further , the driven scroll portion is provided. The member is sandwiched between a pair of drive scroll members to define an expansion chamber that expands toward the outer peripheral portion on both sides of the driven portion end plate, and is formed on one of the rotation axes and is the center of each expansion chamber. It is provided with an inflow port communicating with the portion and an outflow port communicating with the outer peripheral portion of each of the expansion chambers and opening to the driven scroll member, and the fluid flowing from the inflow port is provided on the outer periphery from the central portion of the expansion chamber. In a scroll type expander that expands while moving to a part and rotates the rotation axis,
Each of the drive unit end plates includes a drive side lap outer peripheral portion in which the width of the drive side lap portion is increased in a predetermined range from the final end portion of the drive side lap portion, and is the most of the driven portion end plate of the driven scroll member. A scroll-type expander characterized in that an outer peripheral opening into which the outer peripheral portion of the drive-side lap is inserted is formed in the vicinity of the outer peripheral portion . The drive unit end plate of the drive scroll member is made of an aluminum material, and each has a plurality of reinforcing ribs on the back surface side of the drive side end plate, and a flange portion extending radially from the rotation axis is made of stainless steel. The scroll type expander according to claim 1, wherein the scroll type expander is formed and the reinforcing rib is covered with the flange portion. It is a sealing mechanism that communicates with the inflow port formed on the rotating shaft and seals between the cap portion formed in the housing that rotatably holds the rotating shaft, and the sealing mechanism is the rotating shaft. It is composed of a face seal that abuts on the end face, a parallel pin that prevents the face seal from rotating with respect to the rotation of the rotating shaft, and an O-ring that prevents leakage, and leaks the high-pressure fluid flowing in from the cap side to the low-pressure side. The scroll type inflator according to claim 1 or 2, characterized in that it is prevented. The inner diameter portion of the housing with which the outlets formed on the driven scroll member face each other is formed in a tapered shape so as to extend from the portion facing the outlets to both sides in the axial direction of the rotation axis. The scroll type expander according to any one of claims 1 to 3. The claim is characterized in that the outer diameter of the bearing that rotatably holds the rotary shaft is smaller than the inner diameter of the driven scroll receiver that rotatably holds the driven scroll member on the rotary shaft side where the inflow port is not formed. Item 6. The scroll type expander according to any one of Items 1 to 4.

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