EP3480464B1

EP3480464B1 - Double rotating scroll-type compressor

Info

Publication number: EP3480464B1
Application number: EP17836980.7A
Authority: EP
Inventors: Takuma YAMASHITA; Takahide Ito; Makoto Takeuchi; Keita KITAGUCHI; Hirofumi Hirata
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Ltd
Priority date: 2016-08-01
Filing date: 2017-08-01
Publication date: 2020-09-30
Anticipated expiration: 2037-08-01
Also published as: CN109729720B; EP3480464A4; US20200378383A1; CN109729720A; EP3480464A1; WO2018025877A1; JP6665055B2; JP2018021464A

Description

[Technical Field]

The present invention relates to a co-rotating scroll compressor.

[Background Art]

Hitherto, a co-rotating scroll compressor is known (see PTL 1). The co-rotating scroll compressor includes a driving-side scroll and a driven-side scroll that rotates together with and in synchronization with the driving-side scroll. The co-rotating scroll compressor rotates the driving shaft and the driven shaft in the same direction at the same angular velocity by offsetting a driven shaft that supports the rotation of the driven-side scroll from a driving shaft that rotates the driving-side scroll by the turning radius.

[Citation List]

[Patent Literature]

[PTL 1]
the Publication of Japanese Patent No. 5443132
US 2013/315767 A1 , US 2013/315767 A1 , US 2013/302199 A1 and WO 90/10157 A1 disclose other examples of co-rotating scroll compressors.

[Summary of Invention]

[Technical Problem]

Also for the co-rotating scroll compressor as that in PTL 1, downsizing is desired so that mounting ability and the like is enhanced.
The present invention has been made in view of the situation as above, and an object thereof is to provide a co-rotating scroll compressor that can be downsized.

[Solution to Problem]

In order to solve the abovementioned problem, a co-rotating scroll compressor of the present invention employs the following solutions.
That is, a co-rotating scroll compressor according to an aspect of the present invention is defined in claim 1, and includes: a driving-side scroll member driven by a drive unit so as to rotate, and including a plurality of spiral driving-side walls provided about a center of a driving-side end plate at predetermined angular intervals and in a number corresponding to the driving-side walls, the driven-side walls being engaged with the corresponding driving-side walls so as to form a compression space; a synchronous driving mechanism that transmits driving force from the driving-side scroll member to the driven-side scroll member so that the driving-side scroll member and the driven-side scroll member rotationally move in a same direction at a same angular velocity; and a housing comprising a motor accommodation part that accommodates a motor for rotating the driving-side scroll member, and a scroll accommodation portion that accommodates the scroll members and the synchronous driving mechanism, in which the housing includes: partition surfaces partitioned at a plane including the scroll members and orthogonal to rotational axes of the scroll members; and fastening portions that fasten the partition surfaces in a region on a periphery of the scroll members and on a lateral side when seen from a straight line connecting the rotational axes of the scroll members to each other, wherein the fastening portions are provided on an inner side with respect to a circumscribed circle (C1) surrounding the driving-side scroll member and the driven-side scroll member, the circumscribed circle (C1) partially coming in contact with an external form of the scroll accommodation portion.
The driving-side walls arranged about the center of the end plate of the driving-side scroll member at predetermined angular intervals and the corresponding driven-side walls of the driven-side scroll member are engaged with each other. As a result, a plurality of pairs each formed by one driving-side wall and one driven-side are provided, and the scroll-type compressor including a plurality of lines of walls is formed. The driving-side scroll member is driven by the drive unit so as to rotate, and the driving force transmitted to the driving-side scroll member is transmitted to the driven-side scroll member via the synchronous driving mechanism. As a result, the driven-side scroll member rotationally moves in the same direction at the same angular velocity as the driving-side scroll member while rotating. As described above, the double rotating-type scroll-type compressor in which both of the driving-side scroll member and the driven-side scroll member rotate is provided.
The housing that accommodates both of the scroll members and the synchronous driving mechanism is included. The housing includes the partition surfaces including both of the scroll members and orthogonal to the rotational axes of both of the scroll members. The housing includes the fastening portions for fastening the partition surfaces. Further, the fastening portions are provided in the region on the periphery of both of the scroll members and on the lateral side when seen from the straight line connecting the rotational axes of both of the scroll members to each other.
In the case of the co-rotating scroll compressor, the center of the housing is provided between the rotation center of the driving scroll and the rotation center of the driven scroll. Therefore, when both of the scroll members are seen from the rotational axis, the projected shape of both of the scroll members becomes an elliptical shape having the major axis in the direction in which the rotational axes are connected to each other. Therefore, a space is formed in the region on the periphery of both of the scroll members and on the lateral side when seen from the straight line connecting the rotational axes of both of the scroll members. By providing the fastening portions in the region, the external form of the housing can be caused to be as small as possible, and the co-rotating scroll compressor can be configured in a compact manner.
Further, in the co-rotating scroll compressor according to an aspect of the present invention, the fastening portions are provided in a region orthogonal to the straight line connecting the rotational axes of the scroll members to each other.
In the region orthogonal to the straight line connecting the rotational axes of the scroll members to each other, the largest space can be secured. Therefore, it is preferred that the fastening portions be provided in this region.
Further, the fastening portions are provided on an inner side with respect to a circumscribed circle surrounding the driving-side scroll member and the driven-side scroll member, the circumscribed circle partially coming in contact with an external form of the scroll accommodation portion.
By providing the fastening portions on the inner side with respect to the circumscribed circle surrounding both of the scroll members, the housing can be configured in a compact manner.
Further, the co-rotating scroll compressor according to an aspect of the present invention further includes: a driving-side bearing supporting rotation of the driving-side scroll member; and a driven-side bearing supporting rotation of the driven-side scroll member, in which a mounting hole for performing mounting on an external structure is formed on an outer peripheral side of the driving-side bearing and/or the driven-side bearing.
A predetermined space can be secured between the outer peripheral side of the driving-side bearing and the driven-side bearing and the external form of the housing. In this space, mounting holes for performing mounting on an external structure such as an engine, for example, are formed. As a result, the mounting holes can be formed without upsizing the external form of the housing, and hence the co-rotating scroll compressor can be configured in a compact manner.
The mounting holes are typically used as holes for attaching mounting feet for performing mounting on the external structure. The mounting holes may be through holes or bottomed holes.

[Advantageous Effects of Invention]

The fastening portions are provided in the space formed in the region on the periphery of both of the scroll members and on the lateral side when seen from the straight line connecting the rotational axes of both of the scroll members to each other, and hence the external form of the housing can be caused to be as small as possible, and the co-rotating scroll compressor can be configured in a compact manner.

[Brief Description of Drawings]

[Fig. 1] Fig. 1 is a longitudinal cross-sectional view illustrating a co-rotating scroll compressor according to a first embodiment of the present invention.
[Fig. 2] Fig. 2 is a plan view illustrating a driving-side scroll member in Fig. 1.
[Fig. 3] Fig. 3 is a plan view illustrating a driven-side scroll member in Fig. 1.
[Fig. 4] Fig. 4 is a side view of both of the scroll members in Fig. 1 seen from the rotational axis side.
[Fig. 5] Fig. 5 is a longitudinal cross-sectional view illustrating a co-rotating scroll compressor according to an example not falling under the scope of the claims.
[Fig. 6] Fig. 6 is a longitudinal cross-sectional view illustrating a modification of Fig. 5.

[Description of the Embodiment]

A first embodiment of the present invention is described below with reference to Fig. 1 and the like.
Fig. 1 illustrates a co-rotating scroll compressor 1A. The co-rotating scroll compressor 1A can be used as a supercharger that compresses combustion air (fluid) to be supplied to an internal combustion engine such as a vehicle engine, for example.
The co-rotating scroll compressor 1A includes a housing 3, a motor (drive unit) 5 accommodated in the housing 3 on one end side thereof, and a driving-side scroll member 70 and a driven-side scroll member 90 accommodated in the housing 3 on another end thereof.
The housing 3 has a substantially cylindrical shape, and includes a motor accommodation portion 3a in which the motor 5 is accommodated, and a scroll accommodation portion 3b in which the scroll members 70 and 90 are accommodated.
Cooling fins 3c for cooling the motor 5 are provided on the outer periphery of the motor accommodation portion 3a. An exhaust opening 3d for exhausting air that has been compressed is formed in an end portion of the scroll accommodation portion 3b. Note that, although not shown in Fig. 1, an air suction opening for sucking air is provided in the housing 3.
The scroll accommodation portion 3b of the housing 3 is partitioned by partition surfaces P located in the substantially middle part in the axial direction of the scroll members 70 and 90. In the housing 3, as illustrated in Fig. 4 described below, flange parts (fastening portions) 30 that protrude outward are provided in predetermined positions in the circumferential direction. The partition surfaces P are fastened by inserting a bolt 32 serving as a fastening means in the flange parts 30 and by fixing the bolt 32.
The motor 5 is driven by being supplied with power from a power supply source (not shown). The rotation control of the motor 5 is performed by a command from a control unit (not shown). A stator 5a of the motor 5 is fixed to the inner peripheral side of the housing 3. A rotor 5b of the motor 5 rotates about a driving rotational axis CL1. A driving shaft 6 extending on the driving rotational axis CL1 is connected to the rotor 5b. The driving shaft 6 is connected to a driving-side driving shaft 7c of the driving-side scroll member 70.
The driving-side scroll member 70 includes a first driving-side scroll portion 71 on the motor 5 side, and a second driving-side scroll portion 72 on the exhaust opening 3d side.
The first driving-side scroll portion 71 includes a first driving-side end plate 71a and a first driving-side wall 71b.
The first driving-side end plate 71a is connected to a driving-side shaft portion 7c connected to the driving shaft 6, and extends in a direction orthogonal to the driving-side rotational axis CL1. The driving-side shaft portion 7c is provided so as to be rotatable with respect to the housing 3 via a driving-side bearing 11 that is a ball bearing.
The first driving-side end plate 71a has a substantially disk-like shape when seen in planar view. As illustrated in Fig. 2, three spiral first driving-side walls 71b, that is, three lines of spiral first driving-side walls 71b are provided on the first driving-side end plate 71a. The three lines of first driving-side walls 71b are provided about the driving-side rotational axis CL1 at regular intervals. Winding ending portions 71e of the first driving-side walls 71b are not fixed to other wall portions and are independent. That is, wall portions that connect the winding ending portions 71e to each other so as to provide reinforcement are not provided.
As illustrated in Fig. 1, the second driving-side scroll portion 72 includes a second driving-side end plate 72a and a second driving-side wall 72b. Three lines of the second driving-side walls 72b are provided as with the abovementioned first driving-side walls 71b (see Fig. 2).
A second driving-side shaft portion 72c that extends in the direction of the driving-side rotational axis CL1 is connected to the second driving-side end plate 72a. The second driving-side shaft portion 72c is provided so as to be rotatable with respect to the housing 3 via a second driving-side bearing 14 that is ball bearing. An exhaust port 72d is formed in the second driving-side shaft portion 72c along the driving-side rotational axis CL1.
The first driving-side scroll portion 71 and the second driving-side scroll portion 72 are fixed in a state in which the distal ends (free ends) of the walls 71b and 72b face each other. The first driving-side scroll portion 71 and the second driving-side scroll portion 72 are fixed by a bolt (wall fixing portion) 31 fastened to flange parts 73 provided in a plurality of places in the circumferential direction so as to protrude radially outward.
The driven-side scroll member 90 includes a driven-side end plate 90a provided in substantially the middle in the axial direction (the horizontal direction in the drawing). A through hole 90h is formed in the middle of the driven-side end plate 90a, and the air that has been compressed flows to the exhaust port 72d.
Driven- side walls 91b and 92b are provided on both sides of the driven-side end plate 90a. The first driven-side wall 91b provided from the driven-side end plate 90a to the motor 5 side is engaged with the first driving-side wall 71b of the first driving-side scroll portion 71, and the second driven-side wall 92b provided from the driven-side end plate 90a to the exhaust opening 3d side is engaged with the second driving-side wall 72b of the second driving-side scroll portion 72.
As illustrated in Fig. 3, three first driven-side walls 91b, that is, three lines of first driven-side walls 91b are provided. The three lines of driven-side walls 91b are arranged about a driven-side rotational axis CL2 at regular intervals.
A first supporting member 33 and a second supporting member 35 are provided on both ends of the driven-side scroll member 90 in the axial direction (the horizontal direction in the drawing). The first supporting member 33 is arranged on the motor 5 side, and the second supporting member 35 is arranged on the exhaust opening 3d side. The first supporting member 33 is fixed to the distal end (free end) of the first driven-side wall 91b by a fastening member 25a such as a pin or a bolt, and the second supporting member 35 is fixed to the distal end (free end) of the second driven-side wall 92b by a fastening member 25b such as a pin or a bolt. A shaft portion 33a is provided on the central axis side of the first supporting member 33, and the shaft portion 33a is fixed to the housing 3 via a bearing 37 for the first supporting member. A shaft portion 35a is provided on the central axis side of the second supporting member 35, and the shaft portion 35a is fixed to the housing 3 via a bearing 38 for the second supporting member. As a result, the driven-side scroll member 90 is rotated about a second central axis CL2 via the supporting members 33 and 35.
A pin ring mechanism 15 is provided between the first supporting member 33 and the first driving-side end plate 71a. That is, a ring member 15a is provided in the first driving-side end plate 71a, and a pin member 15b is provided in the first supporting member 33.
The pin ring mechanism 15 is provided between the second supporting member 35 and the second driving-side end plate 72a. That is, the ring member 15a is provided in the second driving-side end plate 72a, and the pin member 15b is provided in the second supporting member 35.
Fig. 4 illustrates a state of the scroll members 70 and 90 seen from the directions of the rotational axes CL1 and CL2. As illustrated in Fig. 4, the driving-side rotational axis CL1 and the driven-side rotational axis CL2 are offset from each other by the turning radius when the scroll members 70 and 90 rotationally move at the same angular velocity. The flange parts 30 are provided in a region, which is on the lateral side with respect to a straight line L1 connecting those rotational axes CL1 and CL2 to each other and on the periphery of both of the scroll members 70 and 90, and the partition surfaces P (see Fig. 1) of the housing 3 are fastened at those positions by bolts. More specifically, the flange parts 30 are provided in a region passing through the rotational axes CL1 and CL2 and orthogonal to the straight line L1. Further, the flange parts 30 are provided on the inner side with respect to a circumscribed circle C1 surrounding both of the scroll members 70 and 90.
A co-rotating scroll compressor 1A of the abovementioned configuration operates as follows.
When the driving shaft 6 is rotated about the driving-side rotational axis CL1 by the motor 5, the driving-side shaft portion 7c connected to the driving shaft 6 also rotates. As a result, the driving-side scroll member 70 rotates about the driving-side rotational axis CL1. When the driving-side scroll member 70 rotates, the driving force is transmitted from the supporting members 33 and 35 to the driven-side scroll member 90 via the pin ring mechanism 15, and the driven-side scroll member 90 rotates about the driven-side rotational axis CL2. At this time, the pin member 15b of the pin ring mechanism 15 moves while being in contact with the ring member 15a, and hence both of the scroll members 70 and 90 rotationally move in the same direction at the same angular velocity.
When both of the scroll members 70 and 90 rotationally move, the air sucked from the suction opening in the housing 3 is sucked from the outer peripheral side of both of the scroll members 70 and 90, and is taken into a compression chamber formed by both of the scroll members 70 and 90. Then, a compression chamber formed by the first driving-side wall 71b and the first driven-side wall 91b, and a compression chamber formed by the second driving-side wall 72b and the second driven-side wall 92b are separately compressed. The capacity of the compression chambers decreases as the compression chambers approach the center side, and the air is compressed accordingly. The air compressed by the first driving-side wall 71b and the first driven-side wall 91b passes through the through hole 90h formed in the driven-side end plate 90a, and is merged with air compressed by the second driving-side wall 72b and the second driven-side wall 92b. The merged air passes through the exhaust port 72d and is exhausted to the outside from the exhaust opening 3d in the housing 3. The exhausted compressed air is guided to an internal combustion engine (not shown) and is used as combustion air.
According to this embodiment, the following effects are exhibited.
In the case of the co-rotating scroll compressor 1A, the rotational axes CL1 and CL2 of the scroll members 70 and 90 are provided so as to be parallel to each other and offset from each other by the distance with which a compression chamber can be formed. Therefore, when both of the scroll members 70 and 90 are seen from the rotational axis (see Fig. 4), the projected shape of both of the scroll members 70 and 90 becomes an elliptical shape having the major axis in the direction in which the rotational axes CL1 and CL2 are connected to each other. Therefore, a space is formed in the region on the periphery of both of the scroll members 70 and 90 and on the lateral side when seen from the straight line L1 connecting both of the rotational axes CL1 and CL2 of the scroll members 70 and 90 to each other. The partition surfaces P are fastened by providing the flange parts 30 in the region, and hence the external form of the housing 3 can be caused to be as small as possible, and the co-rotating scroll compressor 1A can be configured in a compact manner.
Further, as illustrated in Fig. 4, the flange parts 30 are provided on the inner side with respect to the circumscribed circle C1 surrounding both of the scroll members 70 and 90, and hence the housing 3 can be configured in a compact manner.
Note that, in this embodiment, two flange parts 30 are provided, but the present invention is not limited thereto, and three or more flange parts 30 may be provided.
Further, the arrangement positions of the flange parts 30 are provided in the region passing through the rotational axes CL1 and CL2 and orthogonal to the straight line L1 in Fig. 4, but are not limited to the region. The arrangement positions may be provided in a region rotated from those positions about the rotational axes CL1 and CL2.

[First Example]

Next, an example not falling under the scope of the claims is described with reference to Fig. 5.
This example describes positions for forming mounting holes 80 in the co-rotating scroll compressor 1A of the first embodiment. Therefore, in Fig. 5, a compressor similar to the double rotating scroll-type compression 1A of the first embodiment is illustrated, and positions of the mounting holes 80 formed in the housing 3 are added.
The mounting holes 80 are used to connect the co-rotating scroll compressor 1A to an external structure such as an engine. Specifically, the mounting holes 80 are used as holes for attaching mounting feet in order to perform mounting with respect to the external structure.
As illustrated in Fig. 5, the mounting holes 80 are formed on the outer peripheral side of the driving-side bearings 11 and the bearing 37 for the first supporting member and the outer peripheral side of the second driving-side bearing 14 and the bearing 38 for the second supporting member. The mounting holes 80 are formed as through holes.
As described above, in this example, it is focused on the feature in which predetermined spaces can be secured between the outer peripheral side of the bearings 11, 14, 37, and 38 and the external form of the housing 3. By forming the mounting holes 80 in those spaces, the mounting holes 80 can be formed without upsizing the external form of the housing 3, and hence the co-rotating scroll compressor 1A can be configured in a compact manner.
Further, as illustrated in Fig. 6, the mounting holes 80 may be formed on the outer peripheral side of the bearings 11, 14, 37, and 38 as bottomed holes.
Note that, in the abovementioned embodiment and example, the co-rotating scroll compressor is used as a supercharger, but the present invention is not limited thereto, and the co-rotating scroll compressor can be widely used as long as fluid is compressed. For example, the co-rotating scroll compressor can be used as a refrigerant compressor used in an air conditioning unit.

[Reference Signs List]

1A: co-rotating scroll compressor
3: housing
3a: motor accommodation portion
3b: scroll accommodation portion
3c: cooling fin
3d: exhaust opening
5: motor (drive unit)
5a: stator
5b: rotor
6: driving shaft
7c: driving-side shaft portion
11: driving-side bearing
15: pin ring mechanism (synchronous driving mechanism)
15a: ring member
15b: pin member
25a: fastening member
25b: fastening member
30: flange part (fastening portion)
31: bolt (wall fixing portion)
32: bolt
33: first supporting member
33a: shaft portion
35: second supporting member
35a: shaft portion
37: bearing for first supporting member
38: bearing for second supporting member
70: driving-side scroll member
71: first driving-side scroll portion
71a: first driving-side end plate
71b: first driving-side wall
72: second driving-side scroll portion
72a: second driving-side end plate
72b: second driving-side wall
72c: second driving-side shaft portion
72d: exhaust port
73: flange part
90: driven-side scroll member
90a: driven-side end plate
90h: through hole
91b: first driven-side wall
92b: second driven-side wall
L1: straight line
P: partition surface

Claims

A co-rotating scroll compressor (1A), comprising:
a driving-side scroll member (70) driven by a drive unit (5) so as to rotate, and comprising a plurality of spiral driving-side walls (71b, 72b) provided about a center of a driving-side end plate (71a, 72a) at predetermined angular intervals;

a driven-side scroll member (90) comprising spiral driven-side walls (91b, 92b), the driven-side walls being provided about a center of a driven-side end plate (90a) at predetermined angular intervals and in a number corresponding to the driving-side walls (71b, 72b), the driven-side walls (91b, 92b) being engaged with the corresponding driving-side walls (71b, 72b) so as to form a compression space;

a synchronous driving mechanism (15) that transmits driving force from the driving-side scroll member (70) to the driven-side scroll member (90) so that the driving-side scroll member and the driven-side scroll member rotationally move in a same direction at a same angular velocity; and

a housing (3) comprising a motor accommodation part (3a) that accommodates a motor (5) for rotating the driving-side scroll member (70), and a scroll accommodation portion (3b) that accommodates the scroll members (70, 90) and the synchronous driving mechanism (15),

wherein the housing (3) comprises:
partition surfaces (P) partitioned at a plane comprising the scroll members (70, 90) and orthogonal to rotational axes (CL1, CL2) of the scroll members; and

fastening portions (30) that fasten the partition surfaces (P) in a region on a periphery of the scroll members and on a lateral side when seen from a straight line (L1) connecting the rotational axes of the scroll members to each other,

characterized in that the fastening portions (30) are provided on an inner side with respect to a circumscribed circle (C1) surrounding the driving-side scroll member (70) and the driven-side scroll member (90), the circumscribed circle (C1) partially coming in contact with an external form of the scroll accommodation portion (3b).
The co-rotating scroll compressor (1A) according to claim 1, wherein the fastening portions (30) are provided in a region orthogonal to the straight line (L1) connecting the rotational axes (CL1, CL2) of the scroll members (70, 90) to each other.
The co-rotating scroll compressor (1A) according to claim 1 or 2, further comprising:
a driving-side bearing (11) supporting rotation of the driving-side scroll member (70); and

a driven-side bearing (14) supporting rotation of the driven-side scroll member (90),

wherein a mounting hole (80) for performing mounting on an external structure is formed on an outer peripheral side of the driving-side bearing (11) and/or the driven-side bearing (14) .