WO2018110147A1

WO2018110147A1 - Co-rotating scroll compressor

Info

Publication number: WO2018110147A1
Application number: PCT/JP2017/040060
Authority: WO
Inventors: 拓馬山下; 隆英伊藤; 竹内　真実; 恵太北口; 弘文平田
Original assignee: 三菱重工業株式会社; 三菱重工オートモーティブサーマルシステムズ株式会社
Priority date: 2016-12-12
Filing date: 2017-11-07
Publication date: 2018-06-21

Abstract

This co-rotating scroll compressor 1 is provided with a housing 10 which forms an outer shell, a first driving scroll 20 which is supported rotatably inside the housing 10 and which has a spiral drive lap 22 on one end surface of a driving endplate 21, and a driven scroll 50 which is supported rotatably inside the housing 10 and which has a spiral first driven lap 52 on one end surface of a driven endplate 51 opposite of the driving endplate 21. Further, a drive-side stiffening element 27 which supports the drive lap 22 from outside in the radial direction is provided near the winding end of the drive lap 22, and/or, a driven-side stiffening element 56 which supports the first driven lap 52 from outside in the radial direction is provided near the winding end of the first driven lap 52.

Description

Double-rotation scroll compressor

The present invention relates to a double-rotating scroll compressor including a driving scroll that is rotated by a driving source and a driven scroll that rotates in accordance with the rotation of the driving scroll.

The double-rotating scroll compressor includes a driving scroll and a driven scroll whose rotational axes are eccentric from each other, and synchronously rotates both scrolls. The spiral wall of the driving scroll and the spiral wall of the driven scroll are meshed with each other, and a compression chamber is defined between the spiral walls. Then, as the driven scroll rotates and the driven scroll rotates, gas is sucked into the compression chamber and the gas is gradually compressed.

Patent Document 1 discloses a double-rotating scroll compressor in which a driven scroll includes a cylindrical outer peripheral annular block portion, and a spiral driven scroll wrap that connects the outer peripheral annular block portion and a connecting portion located at the center thereof. It is disclosed.

Japanese Patent No. 5547385

Since the double-rotating scroll compressor of Patent Document 1 has a mass called an outer peripheral annular block portion at the outer peripheral portion of the driven scroll, the inertia moment of the driven scroll is increased. Therefore, the double-rotating scroll compressor of Patent Document 1 is not suitable for application to a supercharger or the like that requires high acceleration to reach a desired rotational speed in a short time from a stopped state. .

Accordingly, an object of the present invention is to provide a double-rotating scroll compressor that can be applied to applications that require high rotational acceleration.

The double-rotating scroll compressor of the present invention includes a housing that forms an outer shell, a driving scroll that is rotatably supported inside the housing, and that has a spiral-shaped driving wrap on one end surface of the driving end plate, and that rotates inside the housing. A driven scroll having a spiral driven lap on one end face of the driven end plate opposed to the driving end plate, and one or both of the driving wrap and the driven wrap supported from the circumferential direction or from the radial direction Having a stiffening body to support.

The protector in the present invention is divided into two inventions, a first invention and a second invention.
The first aspect of the present invention is a driving-side stiffening element that supports the driving wrap from the outside in the radial direction in the vicinity of the winding end of the driving lap, and a driven wrap from the outside in the radial direction in the vicinity of the winding end of the driven wrap. One or both of the driven side stiffening elements.
Further, the second invention has a stiffening rib that connects the end of winding of the driving wrap and the driving end plate and supports the driving lap from the circumferential direction.

A specific form of the first invention is as follows.
The driving side stiffening element is preferably provided from the driving end plate to the driving lap, and the driven side stiffening element is preferably provided from the driven end plate to the driven lap.

The driving side stiffening element becomes thicker from the end of winding of the driving wrap toward the inner side of the driving wrap in the circumferential direction, and the driven side stiffening element extends from the end of winding of the driven wrap to the inner side of the driving wrap in the circumferential direction. Toward, it is preferable that the wall thickness is increased.

The drive side stiffening element is within the range of the diameter from the center axis of the drive end plate to the end of winding of the drive wrap, and the driven side stiffening element is of the diameter from the center axis of the driven end plate to the end of winding of the driven wrap. It is preferable to be within the range.

The drive-side stiffening element has a dimension in the direction of the center axis of the drive end plate in the range of 10 to 30% of the tooth length of the drive wrap, and the driven-side stiffening element is in the direction of the center axis of the driven end plate. The dimensions are preferably in the range of 10-30% of the follower wrap tooth height.

The driving scroll includes a first driving scroll provided on one side in the direction of the central axis with the driven scroll as a boundary, and a second driving scroll provided on the other side in the direction of the central axis. It is preferable that one or both of the scroll and the second drive scroll include a drive-side stiffening element.

A specific form of the second invention is as follows.
The stiffening rib preferably has a dimension in the direction of the central axis of the drive end plate that decreases from the end of winding of the drive wrap toward the outer side in the circumferential direction.

It is preferable that the stiffening rib has a uniform dimension connecting to the end of winding of the driving wrap and a dimension connecting to the driving end plate.

The driving scroll includes a first driving scroll provided on one side in the direction of the central axis with the driven scroll as a boundary, and a second driving scroll provided on the other side in the direction of the central axis. One or both of the scroll and the second drive scroll preferably includes a stiffening rib.

A driving side stiffening element that supports the driving wrap from the outside in the radial direction in the vicinity of the winding end of the driving lap, and a driven side stiffening that supports the driven wrap from the outside in the radial direction in the vicinity of the winding end of the driven wrap. It is preferred to have one or both of the elements.

The driving side stiffening element is preferably provided from the driving end plate to the driving lap, and the driven side stiffening element is preferably provided from the driven end plate to the driven lap.

According to the double-rotating scroll of the present invention, since one or both of the driving lap and the driven lap is supported from the circumferential direction or has a stiffening body that supports from the radial direction, it is also applicable to applications that require high rotational acceleration. Applicable.

According to the first invention of the present application, the drive lap has the drive side stiffening element that supports the drive lap from the outside in the radial direction in the vicinity of the end of the winding, so that the drive lap can fall to the outside in the radial direction. While preventing or reducing, the driving scroll can be rotated stably even at high acceleration. The same effect can be obtained when the driven wrap has a driven side stiffening element that supports the driven lap from the outside in the radial direction in the vicinity of the end of the winding.

According to the second invention of the present application, the driving scroll is connected to the end of the driving wrap and the driving end plate, and has the stiffening rib that supports the driving lap from the circumferential direction, so that the driving lap falls outward in the radial direction. Can be prevented or reduced, and the driving scroll can be stably rotated even at high acceleration.

It is sectional drawing which shows schematic structure of the double-rotation scroll compressor which concerns on embodiment (1st Embodiment) of 1st invention. (A) is a partial perspective view which shows the state which the 1st drive scroll and 2nd drive scroll which concern on 1st Embodiment fastened, (b) is a top view of a 1st drive scroll. (A) is a partial perspective view of the 1st drive scroll which concerns on 1st Embodiment, (b) is a side view of a 1st drive scroll. It is a partial enlarged plan view of the first drive scroll of the first embodiment. (A) is a top view of a driven scroll, (b) is a side view of a driven scroll. It is a graph which shows the relationship between the ratio of the height of a drive side stiffening element and the tooth height of a lap, and the bending stress ratio which arises in a lap. It is a graph which shows the relationship between the ratio of the height of the part connected with the wrap of a stiffening rib, and the tooth height of a wrap, and the bending stress ratio which arises in a stiffening rib. (A) is sectional drawing of the 1st drive scroll which concerns on 1st Embodiment, (b) is sectional drawing of the 1st drive scroll which concerns on other embodiment, (c) is still another It is sectional drawing of the 1st drive scroll which concerns on embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment includes both the first invention and the second invention.
As shown in FIG. 1, the double-rotating scroll compressor 1 of the present embodiment includes a housing 10 that forms an outer shell of the double-rotating scroll compressor 1, and a driven scroll 50 that has scrolls on both the front and back surfaces of the driven end plate 51. The second driving scroll 40 rotatably supported on the front side F of the driven scroll 50, the first driving scroll 20 rotatably supported on the rear side B of the driven scroll 50, and the first driving scroll 20 are rotated. An electric motor 60 that outputs a driving force to be driven. In the double-rotating scroll compressor 1, both the first driving scroll 20, the second driving scroll 40, and the driven scroll 50 rotate.

In the double-rotating scroll compressor 1, the driving lap 22 of the first driving scroll 20 and the first driven wrap 52 of the driven scroll 50 mesh with each other to form a plurality of compression spaces. Similarly, in the double-rotating scroll compressor 1, the driving lap 42 of the second driving scroll 40 and the second driven wrap 53 of the driven scroll 50 are engaged with each other to form a plurality of compression spaces. In these compression spaces, the gas sucked from a suction hole (not shown) is compressed and discharged from the discharge cylinder 48.
The second drive scroll 40 and the first drive scroll 20 are fastened by a bolt X1 and rotate together when a drive force is applied to the first drive scroll 20. On the other hand, the driven scroll 50 rotates with the rotation of the first drive scroll 20 and the second drive scroll 40 by a pin ring mechanism described later.

As shown in FIG. 2A, the double-rotating scroll compressor 1 includes drive-side stiffening

elements

27 and 47 and

stiffening ribs

23 and 43 on the first drive scroll 20 and the second drive scroll 40, and As shown in FIG. 5A, a driven side stiffening element 56 is provided. This prevents each lap from tilting radially outward during rotation while allowing operation with high rotational acceleration.
Hereinafter, each element of the double-rotation scroll compressor 1 will be described.
In this embodiment, the direction orthogonal to the direction of the rotation axis C of the rotor shaft 63 is referred to as the radial direction, the side close to the radial rotation axis C is the inner side in the radial direction, and the side far from the radial rotation axis C. Is called the outside in the radial direction.
Moreover, the front side F and the back side B in FIG. 1 have shown the relative positional relationship.

[Housing 10]
As shown in FIG. 1, the housing 10 divides the inside of the main body 11 back and forth from the front side F, the main body 11 accommodating the second driving scroll 40, the driven scroll 50, the first driving scroll 20 and the electric motor 60. The first drive scroll 20 and the partition wall 12 separating the electric motor 60 are provided.
In the main body 11, a second boss 13 is formed at the end of the front side F so as to surround the rotation axis C of the housing 10. The second boss 13 is formed in a cylindrical shape and surrounds the discharge cylinder 48 of the second drive scroll 40.

The second boss 13 functions as a large diameter cylinder 14 that functions as a bearing box that accommodates the bearing 84 of the second support 80, and as a bearing box that accommodates the bearing 46 of the second drive scroll 40 on the front side F. A small diameter cylinder 15 is provided.
In addition, the bearing 46 consists of a ball bearing provided with an inner ring | wheel, an outer ring | wheel, and the spherical rolling element provided between an inner ring | wheel and an outer ring | wheel, for example. The

bearings

26, 74, 84, and 64 described later are the same as the bearing 46.

As with the second boss 13, the partition wall 12 is formed with a cylindrical first boss 16. The first boss 16 functions as a large-diameter cylinder 17 that functions as a bearing box that accommodates the bearing 74 of the first support 70, and a bearing box that accommodates the bearing 26 of the first drive scroll 20 on the rear side B. A small diameter cylinder 18 is provided.
Further, the main body 11 is formed with a third boss 19 projecting to the rear side B so as to surround the rotation axis C of the housing 10 at the end of the rear side B. The third boss 19 functions as a bearing box that houses a bearing 64 of the electric motor 60 described later.

[First drive scroll 20]
The first driving scroll 20 is rotatably supported inside the main body 11, and the driving force from the electric motor 60 is directly transmitted thereto.
As shown in FIGS. 1 and 2B, the first drive scroll 20 stands vertically from a drive end plate 21 rotatably supported by the housing 10 and one end face on the front side F of the drive end plate 21. The driving wrap 22, a stiffening rib 23 extending from the winding end 24 of the driving wrap 22, and a driving side stiffening element 27 provided on the outer peripheral surface in the vicinity of the winding end 24 of the driving wrap 22 are provided. In the first drive scroll 20, a drive end plate 21, a drive wrap 22, a stiffening rib 23, and a driving side stiffening element 27 are integrally formed.

As shown in FIG. 1, the drive end plate 21 includes a drive shaft 28 formed integrally with the drive end plate 21 on the other end surface opposite to the one end surface on which the drive wrap 22 is provided.
The drive shaft 28 is arranged coaxially with the rotation axis C of the rotor shaft 63 of the electric motor 60. The drive shaft 28 may be formed integrally with the rotor shaft 63. The drive shaft 28 is rotatably supported by the first boss 16 of the housing 10 via the bearing 26.
The center axis C1 of the drive end plate 21 is parallel to the rotation axis C of the rotor shaft 63 and slightly decentered with respect to the rotation axis C as shown in FIG. The same applies to the central axis C1 of the drive end plate 41 of the second drive scroll 40.

As shown in FIG. 2B, the driving wrap 22 (22A, 22B, 22C) has a spiral shape along the involute curve, and extends from the radially inner side of the peripheral edge of the discharge hole 21A to the radially outer side. ing.
In the present embodiment, the first drive scroll 20 includes three drive wraps 22A, 22B, and 22C. The driving wraps 22A, 22B, and 22C are arranged with a phase shifted by 120 ° in the circumferential direction from the periphery of the discharge hole 21A. And each drive lap 22 opposes the outer peripheral surface of the other drive wrap 22 where the whole inner peripheral surface is adjacent to radial direction. On the other hand, the outer peripheral surface of each drive lap 22 is opposed to the inner peripheral surface of another drive lap 22 adjacent in the radial direction except for the vicinity of the winding end 24.
The driving wraps 22A, 22B, and 22C have the same tooth height Hr.
In addition, when not distinguishing drive lap | wrap 22A, 22B, 22C, it may only be called drive lap | wrap 22. FIG. The same applies to the first driven wraps 52A to 52C.

As shown in FIGS. 2A and 2B, each of the driving wraps 22A, 22B, and 22C has a fastening protrusion 25 protruding outward in the radial direction on the outer periphery thereof.
As shown in FIG. 1 and FIG. 2A, the first drive scroll 20 is driven by the bolt X 1 through the fastening protrusions 45 aligned with the fastening protrusions 45 of the second drive scroll 40. Fastened to the scroll 40.

As shown in FIGS. 3A and 3B, the first drive scroll 20 includes a stiffening rib 23.
The stiffening ribs 23 support the driving wrap 22 from the outer side in the circumferential direction, thereby preventing the driving wrap 22 from falling outward in the radial direction when the first driving scroll 20 rotates.
As shown in FIGS. 3A and 3B, the stiffening rib 23 is provided integrally with the drive wrap 22 and the drive end plate 21 between the winding end 24 of the drive wrap 22 and the drive end plate 21. It has been. The stiffening rib 23 has a form in which the lower end of the drive wrap 22 is extended in the circumferential direction, and is provided integrally with the drive wrap 22 and the drive end plate 21 to finish winding the drive wrap 22. Support at 24. This prevents the drive wrap 22 from falling radially outward during rotation.

As shown in FIG. 3A, the stiffening rib 23 is formed such that the height H1 from the driving end plate 21 gradually decreases as it moves away from the winding end 24 side. The dimension connected to the winding end 24 and the dimension connected to the drive end plate 21 are in a triangular shape.
The stiffening rib 23 may have a rectangular shape. However, since it is the portion connected to the drive wrap 22 and the drive end plate 21 that contributes to the support of the drive wrap 22 at the winding end 24, a result of eliminating the extra portion of the stiffening rib 23. As a triangle shape is adopted.

Next, the 1st drive scroll 20 is provided with the drive side stiffening element 27, as shown to Fig.3 (a), (b).
The drive-side stiffening element 27 supports the drive wrap 22 from the outside in the radial direction, thereby preventing the drive lap 22 from falling outside in the radial direction when the first drive scroll 20 rotates.
The drive side stiffening element 27 extends from the tip S of the drive end plate 21 to the end E reaching the protrusion 29 while gradually increasing in thickness along the drive lap 22 inward. The drive-side stiffening element 27 is provided from the drive end plate 21 to the drive wrap 22 and functions as a stiffening body that supports the drive end plate 21 and the drive wrap 22 from the outside in the radial direction.
As shown in FIG. 4, the drive-side stiffening element 27 continuously increases in thickness T as a radial dimension from the tip S side toward the protrusion 29. Specifically, the outer peripheral surface of the drive side stiffening element 27 is formed to coincide with an arc surface having a radius R1 from the central axis C1 of the drive end plate 21 to the tip S of the stiffening rib 23. That is, the drive side stiffening element 27 is formed within a radius R1 centered on the central axis C1. The drive wrap 22 has a radius R1 larger than the radius R2 at the end E near the protrusion 29, and the drive side stiffening element 27 has a circular arc drawn by the radius R1 of the drive end plate 21 in the radial direction. The wall thickness T is necessary to prevent the drive wrap 22 from falling outside in the radial direction while falling within the range.
As shown in FIG. 3B, the drive-side stiffening element 27 has a constant dimension in the direction of the central axis C1, and is rectangular when viewed from the outside in the radial direction. The height H2 of the drive side stiffening element 27 is equal from the front end S to the end E.

As shown in FIG. 1, the drive end plate 21 has a plurality of pins 31 around the drive shaft 28.
The plurality of pins 31 together with a plurality of holding holes 73 provided in the first support 70 described later constitute a pin ring mechanism that is a rotational force transmission mechanism that transmits the rotation of the first drive scroll 20 to the driven scroll 50.
When the first drive scroll 20 rotates, the pin 31 inserted into the holding hole 73 comes into contact with the inner peripheral surface of the holding hole 73, and the rotational force of the first drive scroll 20 is driven via the first support 70. Is transmitted to. Accordingly, the driven scroll 50 rotates according to the rotation of the first drive scroll 20 and the second drive scroll 40.
As long as the rotation of the first drive scroll 20 can be transmitted to the driven scroll 50, other rotational force transmission mechanisms can be used as appropriate.

[Second drive scroll 40]
In the second drive scroll 40, the driving force output from the electric motor 60 is transmitted via the first drive scroll 20.
As shown in FIG. 1, the second driving scroll 40 has a mirror image relationship with the first driving scroll 20 with the driven end plate 51 of the driven scroll 50 as a boundary.
As shown in FIGS. 1 and 2A, the second drive scroll 40 includes a drive end plate 41 that is rotatably supported by the housing 10 and a rear side of the drive end plate 41, as with the first drive scroll 20. A drive wrap 42 that rises vertically from the surface of the side B, a stiffening rib 43 extending from the winding end 44 of the driving wrap 42, and a driving side stiffening element 47 provided on the outer peripheral surface in the vicinity of the winding end 44 of the driving wrap 42. . Each of these elements is configured in the same manner as the drive lap 22 except that the positions and orientations of the elements are different. In the second driving scroll 40, a driving end plate 41, a driving wrap 42, a stiffening rib 43, and a driving side stiffening element 47 are integrally formed.

As shown in FIGS. 1 and 2A, the drive end plate 41 includes a cylindrical discharge cylinder 48 at the center of the surface opposite to the surface on which the drive wrap 42 is provided. The discharge cylinder 48 is rotatably supported by the second boss 13 of the housing 10 via the bearing 46. As shown in FIG. 1, the discharge cylinder 48 is connected to a plurality of compression spaces via discharge holes 48 A that penetrate the drive end plate 41.

[Following scroll 50]
The driven scroll 50 rotates according to the rotation of the first drive scroll 20 and the second drive scroll 40.
The driven scroll 50 includes a driven end plate 51, a first driven wrap 52 that rises vertically from the rear side B surface of the driven end plate 51, and a driven as shown in FIGS. 1, 5 (a) and 5 (b). A second driven wrap 53 rising vertically from the front side F surface of the end plate 51, a driven side stiffening element 56 provided on the outer peripheral surface in the vicinity of the first driven wrap 52 and the winding end 55 of the second driven wrap 53; . In the driven scroll 50, a driven end plate 51, a first driven wrap 52, a second driven wrap 53, and a driven side stiffening element 56 are integrally formed.

As shown in FIG. 5A, the driven end plate 51 has a vent hole 57 formed in the center, and the gas compressed between the first drive scroll 20 and the driven scroll 50 passes through the vent hole 57. It passes through and reaches the discharge cylinder 48.
The center axis C2 of the driven end plate 51 is parallel to the rotation axis C of the rotor shaft 63 and slightly decentered with respect to the rotation axis C.

As shown in FIG. 5A, the first driven wrap 52 has a spiral shape along the involute curve, and extends outward from the periphery of the vent hole 57 in the radial direction.
In the present embodiment, the first driven wrap 52 includes three first driven wraps 52A, 52B, and 52C. The first driven wraps 52 A, 52 B, 52 C are arranged with a phase shifted by 120 ° in the circumferential direction from the periphery of the vent hole 57. And each 1st driven wrap 52 opposes the outer peripheral surface of the 1st driven wrap 52 where the whole inner peripheral surface is adjacent to radial direction. On the other hand, the outer peripheral surface of each of the first driven wraps 52 is opposed to the inner peripheral surface of another first driven wrap 52 that is adjacent in the radial direction except for the vicinity of the winding end 55.

As shown in FIG. 1, each of the first driven wraps 52 A, 52 B, and 52 C has a fastening protrusion 58 that protrudes radially outward on the outer periphery thereof.
As shown in FIG. 1, the driven scroll 50 is fastened to the first support 70 by the bolt X 2 passing through the fastening protrusion 58 aligned with the insertion hole 75 of the first support 70.

The second driven wrap 53 has a mirror image relationship with the first driven wrap 52 with the driven end plate 51 as a boundary.
As shown in FIG. 1, the second driven wrap 53 is fixed to the second support 80 by a bolt X2. The bolt X 2 passes through the insertion hole 83 provided in the second support 80 and is fastened to the fastening protrusion 59.

As shown in FIG. 5A, the driven scroll 50 is gradually thickened inward along the first driven wrap 52 from the respective leading ends S to the end E of the first driven wraps 52A, 52B, 52C. Is provided with a driven stiffening element 56 that extends while increasing.
As shown in FIG. 5B, the driven side stiffening element 56 is provided from the driven end plate 51 to the first driven wrap 52, and the driven end plate 51 and the first driven wrap 52 are connected from the outside in the radial direction. It functions as a supporting stiffening body.
As shown in FIG. 5B, the driven side stiffening element 56 is provided not only from the first driven wrap 52 side but also from the driven end plate 51 to the second driven wrap 53. In the driven side stiffening element 56, the height H3 on the first driven wrap 52 side is equal to the height H4 on the second wrap side.
As shown in FIGS. 5 (a) and 5 (b), the driven-side stiffening element 56 has a thickness T that continuously increases from the tip S to the end E, and is in the direction of the central axes C1 and C2. The dimensions are constant and are rectangular when viewed from the outside in the radial direction.

[First support 70]
As shown in FIG. 1, the first support 70 supports the driven scroll 50 so as to be rotatable with respect to the housing 10.
As shown in FIG. 1, the first support 70 includes a sleeve 71 and a flange 72 that projects outward from the end of the front side F of the sleeve 71 in the radial direction. The flange 72 includes a plurality of insertion holes 75 penetrating the front and back.
The sleeve 71 has the drive shaft 28 of the first drive scroll 20 inserted therethrough.
The sleeve 71 is rotatably supported by the large-diameter cylinder 17 of the first boss 16 inside the housing 10 via a bearing 74.

[Second support 80]
As shown in FIG. 1, the second support 80 supports the driven scroll 50 so as to be rotatable with respect to the housing 10 together with the first support 70.
The second support 80 includes a sleeve 81 and a flange 82 that projects outward from the end of the rear side B of the sleeve 81 in the radial direction. The flange 82 includes a plurality of insertion holes 83 penetrating the front and back.
Inside the sleeve 81, the discharge cylinder 48 of the second drive scroll 40 is inserted.
The sleeve 81 is rotatably supported by the large-diameter cylinder 14 of the second boss 13 through the bearing 84 inside the housing 10.

[Electric motor 60]
As shown in FIG. 1, the electric motor 60 includes a rotor 61 provided integrally around the rotor shaft 63 and a stator 62 provided around the rotor 61.
The rotor shaft 63 is rotatably supported by the third boss 19 of the housing 10 via the bearing 64 on the rear side B. And it is rotatably supported by the 1st boss | hub 16 of the housing 10 via the bearing 26 with the drive shaft 28 by the front side F. As shown in FIG.

[Operation of double-rotation scroll compressor 1]
Next, the operation of the double scroll compressor 1 will be briefly described.
When a driving force is applied from the electric motor 60, the first driving scroll 20, the second driving scroll 40, and the driven scroll 50 relatively revolve. Then, it is formed between the driving lap 22 of the first driving scroll 20 and the first driven wrap 52 of the driven scroll 50, and between the driving wrap 42 of the second driving scroll 40 and the second driven wrap 53 of the driven scroll 50. The compressed space thus moved moves radially inward while shrinking. As a result, the gas entering the compression space is gradually compressed and discharged from the discharge cylinder 48.

[Effect of double-rotating scroll compressor 1]
Hereinafter, the effects produced by the double-rotating scroll compressor 1 will be described.
The double scroll compressor 1 includes driving

side stiffening elements

27 and 47 in the first driving scroll 20 and the second driving scroll 40, and a driven side stiffening element 56 in the driven scroll 50. Hereinafter, the effects of the driving

side stiffening elements

27 and 47 and the driven side stiffening element 56 will be described using the driving side stiffening element 27 as an example.

When the first driving scroll 20 rotates on the driving wrap 22, a load is exerted to incline the driving wrap 22 toward the outside in the radial direction due to the centrifugal force caused by the rotation. The bending moment due to this load becomes the largest at the winding end 24 where the distance from the central axis C1 is long and the vicinity thereof. Therefore, the present embodiment includes a drive side stiffening element 27 that supports the root of the drive wrap 22 from the outside in the radial direction in the vicinity of the winding end 24 of the drive wrap 22.
Since the driving side stiffening element 27 supports the root of the driving wrap 22 from the outside in the radial direction in the vicinity of the winding end 24, even if the first driving scroll 20 rotates and centrifugal force acts on the driving wrap 22. Against the bending moment, the drive wrap 22 is prevented or reduced from falling radially outward.

In the first driving scroll 20, the moment of inertia increases due to the increase in mass due to the provision of the driving side stiffening element 27.
However, the drive-side stiffening element 27 is provided only in the vicinity of the winding end 24 in the circumferential direction and within the range of the arc drawn by the radius R1 of the drive end plate 21 in the radial direction. As described above, the first drive scroll 20 can minimize the increase in mass by limiting the range in which the drive-side stiffening element 27 is provided, so that the first drive scroll 20 can rotate stably even at high acceleration. .

Here, FIG. 6 shows the relationship between the ratio (H2 / Hr) of the height H2 of the drive side stiffening element 27 having a different thickness T and the tooth height Hr of the drive wrap 22 and the bending stress ratio generated in the drive wrap 22. Show. The bending stress ratio is represented by an index in which the driving side stiffening element 27 is not provided, that is, when H2 = 0.
From FIG. 6, it can be seen that the bending stress generated in the drive lap 22 varies depending on H2 / Hr. If H2 / Hr is in the range of 0.1 to 0.3 (10% to 30%), the bending stress can be reduced. Therefore, it is preferable to provide the drive side stiffening element 27 using this as a guide.

Next, the effect obtained by providing the first drive scroll 20 and the second drive scroll 40 with the stiffening

ribs

23 and 43 will be described using the stiffening rib 23 as an example.
Since the stiffening rib 23 is provided integrally with the drive wrap 22 and the drive end plate 21 between the winding end 24 of the drive wrap 22 and the drive end plate 21, the drive wrap 22 is provided from the outer side in the circumferential direction. To support. Therefore, even if the first driving scroll 20 rotates and centrifugal force acts on the driving lap 22, the stiffening rib 23 resists the bending moment and prevents or reduces the driving lap 22 from falling outward in the radial direction. To do.

Further, the first drive scroll 20 has an increased moment of inertia due to an increase in mass due to the provision of the stiffening ribs 23.
However, since the stiffening rib 23 is provided only in a range that contributes to supporting the drive lap 22 from the outer side in the circumferential direction, an increase in mass due to the provision of the stiffening rib 23 is minimized. be able to. Therefore, the first drive scroll 20 can rotate stably even at a high acceleration.

Here, FIG. 7 shows the ratio of the height H1 of the portion where the stiffening rib 23 is connected to the winding end 24 and the tooth height Hr of the driving wrap 22 (H1 / Hr) and the bending stress ratio generated in the stiffening rib 23. The relationship is shown. The bending stress ratio is expressed as an index with 1 when H1 / Hr is 1.
From FIG. 7, the bending stress generated in the stiffening rib 23 can be reduced when H1 / Hr is large, that is, when the dimension of the portion where the stiffening rib 23 is connected to the winding end 24 is large. However, since the mass of the first drive scroll 20 increases as H1 / Hr increases, it is preferable to set H1 / Hr in consideration of the advantage of reducing the bending stress and the disadvantage due to the increase in mass.

The preferred embodiments of the present invention have been described above. In addition to the above, unless otherwise deviating from the gist of the present invention, the configurations described in the above embodiments may be selected or appropriately changed to other configurations. Is possible.

For example, in this embodiment, the driven scroll 50 has scrolls on both the front and back surfaces of the driven end plate 51, but the present invention is not limited to this and may have scrolls only on one side.

Moreover, although the 1st drive scroll 20 is provided with the three drive laps 22 of drive lap | wrap 22A, 22B, 22C, the number of the drive lap | wraps 22 is not limited to this. Note that the number of drive wraps 22 is preferably an odd number.
The second driving scroll 40 and the driven scroll 50 are the same as the first driving scroll 20.

Furthermore, in this embodiment, the drive side stiffening element 27 is provided so as to cover all the side surfaces of the drive end plate 21 from the tip S to the end E as shown in FIG. The invention is not limited to this. That is, it is sufficient that the drive side stiffening element 27 is provided from the drive end plate 21 to the drive wrap 22 so as to prevent the drive wrap 22 from falling outside in the radial direction, as shown in FIG. In addition, the side surface of the drive end plate 21 may be exposed between the front end S and the end E. The driving side stiffening element 47 and the driven side stiffening element 56 are the same as the driving side stiffening element 27.

In the present embodiment, the drive-side stiffening element 27 has a thickness T equal to the direction of the central axis C1, but is not limited thereto. If the root of the driving wrap 22 can prevent the driving wrap 22 from falling outward in the radial direction, for example, as shown in FIG. The thickness T may be provided to be thin. The driving side stiffening element 47 and the driven side stiffening element 56 are the same as the driving side stiffening element 27.

In the present embodiment, the outer peripheral surface of the drive side stiffening element 27 is formed so as to coincide with an arc surface having a radius R1 from the central axis C1 of the drive end plate 21 to the tip S of the stiffening rib 23. It is not limited to this. If the outer peripheral surface may have a plurality of corners and the first drive scroll 20 rotates stably at a high acceleration, the radius of the outer peripheral surface of the drive side stiffening element 27 from the central axis C1 is the radius R1. May be larger. The driving side stiffening element 47 and the driven side stiffening element 56 are the same as the driving side stiffening element 27.

In the present embodiment, the first driving scroll 20 has a driving side stiffening element 27 and the second driving scroll 40 has a driving side stiffening element 47 as the driving side stiffening element, and the driven scroll as the driven side stiffening element. 50 has a driven side stiffening element 56, but is not limited thereto. The present invention includes a form including only one of the driving side stiffening element and the driven side stiffening element. Even if it is this form, depending on the use conditions of the double-rotation scroll compressor 1, it can prevent that each lap inclines to the outer side of radial direction at the time of rotation.

In the present embodiment, the first drive scroll 20 includes the stiffening ribs 23 and the second drive scroll 40 includes the stiffening ribs 43. However, the present invention is not limited to this. The present invention includes a form in which only one of the stiffening rib 23 and the stiffening rib 43 is provided.

1 Rotating Scroll Compressor 10 Housing 20 First Drive Scroll 21 Drive End Plate 22 Drive Wrap 23 Stiffening Rib 27 Drive Side Stiffening Element 40 Second Drive Scroll 41 Drive End Plate 42 Drive Wrap 43 Stiffening Rib 47 Drive Side Supplement Rigid element 50 driven scroll 51 driven end plate 52 first driven wrap 53 second driven wrap 56 driven side stiffening element 60 electric motor 70 first support 80 second support C rotational axis C1 central axis C2 central axis S tip E end T Thickness X1 Bolt X2 Bolt

Claims

A housing forming an outer shell,
A drive scroll supported rotatably inside the housing and having a spiral drive wrap on one end face of the drive end plate;
A driven scroll having a spiral driven follower wrap on one end face of a driven end plate that is rotatably supported in the housing and faces the drive end plate;
It has a stiffening body that supports one or both of the driving wrap and the driven wrap from the circumferential direction or from the radial direction.
A double-rotating scroll compressor characterized by that.
The stiffening body is
A drive-side stiffening element that supports the drive wrap from the outside in the radial direction in the vicinity of the winding end of the drive wrap; and
In the vicinity of the end of winding of the driven wrap, one or both of driven side stiffening elements that support the driven wrap from the outside in the radial direction are provided.
The double-rotating scroll compressor according to claim 1.
The driving side stiffening element is provided from the driving end plate to the driving lap,
The driven side stiffening element is provided from the driven end plate to the driven lap,
The double-rotating scroll compressor according to claim 2.
The drive side stiffening element is
From the end of winding of the driving wrap toward the inner side in the circumferential direction of the driving wrap, the thickness increases,
The driven side stiffening element is
From the winding end of the driven wrap toward the inner side in the circumferential direction of the driving wrap, the thickness increases.
The double-rotating scroll compressor according to claim 3.
The drive side stiffening element is
Fit within a range of diameter from the center axis of the drive end plate to the end of winding of the drive wrap;
The driven side stiffening element is
It fits in the range of the diameter from the central axis of the driven end plate to the end of winding of the driven wrap.
The double-rotating scroll compressor according to claim 4.
The drive side stiffening element is
The dimension of the driving end plate in the direction of the central axis is in the range of 10 to 30% of the tooth height of the driving wrap;
The driven side stiffening element is
A dimension of the driven end plate in the direction of the central axis is in a range of 10 to 30% of a tooth height of the driven wrap;
The double-rotating scroll compressor according to claim 5.
The driving scroll is
A first driving scroll provided on one side in the direction of the central axis with the driven scroll as a boundary, and a second driving scroll provided on the other side in the direction of the central axis,
One or both of the first driving scroll and the second driving scroll include the driving side stiffening element.
The double-rotating scroll compressor according to claim 5 or 6.
The stiffening body is
It has a stiffening rib that connects the winding end of the driving wrap and the driving end plate, and supports the driving lap from the circumferential direction.
The double-rotating scroll compressor according to claim 1.
The stiffening rib is
The dimension in the direction of the central axis of the drive end plate decreases from the end of winding of the drive wrap toward the outer side in the circumferential direction,
The double-rotating scroll compressor according to claim 8.
The stiffening rib is
The dimension connected to the winding end of the driving wrap and the dimension connected to the driving end plate are equal.
The double-rotating scroll compressor according to claim 8 or 9.
The driving scroll is
A first driving scroll provided on one side in the direction of the central axis with the driven scroll as a boundary, and a second driving scroll provided on the other side in the direction of the central axis.
One or both of the first driving scroll and the second driving scroll include the stiffening rib.
The double-rotating scroll compressor according to any one of claims 8 to 10.
A driving-side stiffening element that supports the driving wrap from the outside in the radial direction in the vicinity of the winding end of the driving wrap; and
In the vicinity of the winding end of the driven wrap, one or both of driven side stiffening elements that support the driven lap from the outside in the radial direction are provided.
The double-rotating scroll compressor according to any one of claims 8 to 11.
The driving side stiffening element is provided from the driving end plate to the driving lap,
The driven side stiffening element is provided from the driven end plate to the driven lap,
The double-rotating scroll compressor according to claim 12.