JP6665055B2 - Double rotary scroll compressor - Google Patents

Description

  The present invention relates to a double scroll compressor.

  2. Description of the Related Art Conventionally, a rotary scroll compressor has been known (see Patent Document 1). This includes a driving scroll and a driven scroll that rotates in synchronization with the driving scroll, and a driven shaft that supports the rotation of the driven scroll with respect to the driving shaft that rotates the driving scroll by an amount equal to the turning radius. The drive shaft and the driven shaft are rotated at the same angular velocity in the same direction, offset by only one offset.

Japanese Patent No. 5443132

  Also in the dual rotary scroll type compressor as disclosed in Patent Document 1, compactness is desired for reasons such as improvement of mountability.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a dual rotary scroll compressor that can be made compact.

In order to solve the above-mentioned problems, the dual rotary scroll compressor of the present invention employs the following means.
That is, the dual rotary scroll compressor according to the present invention is driven by a driving unit, and has a plurality of spiral driving side wall members which are installed at predetermined angular intervals around the center of the driving side end plate. A side scroll member and a plurality of spirally driven side walls are provided around the center of the driven side end plate at a predetermined angular interval, and each of the driven side wall bodies has a number corresponding to each of the driving side wall bodies. The driven scroll member, which forms a compression space by being engaged with the corresponding drive side wall member, and the driving scroll member and the driven scroll member rotate in the same direction at the same angular velocity. A synchronous driving mechanism for transmitting a driving force from a driving scroll member to the driven scroll member, and a housing accommodating the scroll members and the synchronous driving mechanism. The housing includes a divided surface that includes each of the scroll members and is divided by a plane substantially orthogonal to each of the rotation axes of each of the scroll members, and a side as viewed from a straight line that connects each of the rotation axes of each of the scroll members. And a fastening portion for fastening the divided surfaces in a region around each of the scroll members.

Each of the driving side wall members arranged at a predetermined angular interval around the center of the end plate of the driving side scroll member is engaged with the corresponding driven side wall member of the driven side scroll member. As a result, a plurality of pairs each including one driving side wall and one driven side wall are provided, and a scroll compressor having a plurality of walls is formed. The driving scroll member is rotationally driven by the driving unit, and the driving force transmitted to the driving scroll member is transmitted to the driven scroll member via the synchronous driving mechanism. As a result, the driven scroll member rotates and rotates in the same direction and at the same angular velocity with respect to the drive scroll member. Thus, a double-rotating scroll compressor in which both the driving scroll member and the driven scroll member rotate is provided.
A housing is provided for accommodating both scroll members and a synchronous drive mechanism. The housing includes the two scroll members and has a divided surface substantially orthogonal to each rotation axis of the two scroll members. The housing has a fastening portion for fastening the split surface. Then, the fastening portion is provided on the side of the straight line connecting the respective rotation axes of the two scroll members and in a region around the two scroll members.
In the case of a double 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 the two scroll members are viewed from the rotation axis, the projected shape of the two scroll members is an oval shape having a major axis in a direction connecting the respective rotation axes. Therefore, a space is created in a region on the side and the periphery of both scroll members when viewed from the straight line connecting the rotation axes of both scroll members. By providing the fastening portion in this area, the outer shape of the housing can be made as small as possible, and the dual rotary scroll compressor can be made compact.

  Further, in the dual rotary scroll compressor according to the present invention, the fastening portion is provided in a region substantially orthogonal to a straight line connecting the rotation axes of the scroll members.

  A region that is substantially perpendicular to a straight line connecting the rotation axes of the scroll members can secure the largest space. Therefore, it is preferable to provide a fastening portion in this area.

  Further, in the dual rotary scroll compressor according to the present invention, the fastening portion is provided inside a circumscribed circle surrounding the driving scroll member and the driven scroll member.

  By providing the fastening portion inside the circumscribed circle surrounding both scroll members, the housing can be made compact.

  Further, the dual rotary scroll compressor according to the present invention includes a driving-side bearing that supports rotation of the driving-side scroll member, and a driven-side bearing that supports rotation of the driven-side scroll member. And / or a mounting hole for mounting to an external structure is formed on an outer peripheral side of the driven-side bearing.

A predetermined space can be secured between the outer periphery of the drive-side bearing and the driven-side bearing and the outer shape of the housing. In this space, for example, a mounting hole for mounting to an external structure such as an engine is provided. Thus, since the mounting holes can be formed without increasing the outer shape of the housing, the double-rotating scroll compressor can be made compact.
The mounting hole is typically used as a hole for mounting a mounting leg for mounting to an external structure. The mounting hole may be a through hole or a bottomed hole.

  Since the fastening portion is provided in a space generated in the area around the two scroll members, which is lateral to the straight line connecting the rotation axes of the two scroll members, the outer shape of the housing is reduced as much as possible. Thus, the rotary scroll compressor can be made compact.

It is a longitudinal section showing the double rotation scroll type compressor concerning a 1st embodiment of the present invention. FIG. 2 is a plan view showing a driving scroll member of FIG. 1. FIG. 2 is a plan view showing a driven scroll member of FIG. 1. It is the side view which looked at both scroll members of Drawing 1 from the axis of rotation. It is a longitudinal section showing the double scroll compressor concerning a 2nd embodiment of the present invention. It is a longitudinal cross-sectional view showing a modification of FIG.

Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
FIG. 1 shows a double scroll compressor 1A. The rotary scroll compressor 1A can be used as a supercharger for compressing combustion air (fluid) supplied to an internal combustion engine such as a vehicle engine.

  The rotary scroll compressor 1A includes a housing 3, a motor (drive unit) 5 housed at one end of the housing 3, a drive scroll member 70 and a driven scroll member housed at the other end of the housing 3. 90.

The housing 3 has a substantially cylindrical shape, and includes a motor housing 3a for housing the motor 5 and a scroll housing 3b for housing the scroll members 70 and 90.
Cooling fins 3c for cooling the motor 5 are provided on the outer periphery of the motor housing 3a. A discharge port 3d for discharging compressed air is formed at an end of the scroll housing 3b. Although not shown in FIG. 1, the housing 3 is provided with an air suction port for sucking air.
The scroll accommodating portion 3b of the housing 3 is divided by a dividing plane P located at a substantially central portion in the axial direction of the scroll members 70 and 90. As shown in FIG. 4 described later, the housing 3 is provided with a flange portion (fastening portion) 30 that protrudes outward at a predetermined position in the circumferential direction. By fixing the flange portion 30 through a bolt 32 as a fastening means, the divided surface P is fastened.

  The motor 5 is driven by supplying power from a power supply source (not shown). The rotation of the motor 5 is controlled by a command from a control unit (not shown). The stator 5 a of the motor 5 is fixed to the inner peripheral side of the housing 3. The rotor 5b of the motor 5 rotates around the drive rotation axis CL1. The drive shaft 6 extending on the drive rotation axis CL1 is connected to the rotor 5b. The drive shaft 6 is connected to a drive-side drive shaft 7c of the drive-side scroll member 70.

The drive-side scroll member 70 includes a first drive-side scroll section 71 on the motor 5 side and a second drive-side scroll section 72 on the discharge port 3d side.
The first drive-side scroll portion 71 includes a first drive-side end plate 71a and a first drive side wall 71b.
The first drive side end plate 71a is connected to a drive side shaft portion 7c connected to the drive shaft 6, and extends in a direction orthogonal to the drive side rotation axis CL1. The drive-side shaft portion 7c is provided rotatably with respect to the housing 3 via a drive-side bearing 11 that is a ball bearing.

  The first drive side end plate 71a has a substantially disk shape when viewed in plan. As shown in FIG. 2, on the first driving side end plate 71a, three spirally driven first driving side walls 71b, that is, three strips are provided. The three first driving side wall bodies 71b are arranged at equal intervals around the driving side rotation axis CL1. The winding end portions 71e of the first driving side wall 71b are not fixed to other wall portions, but are independent. That is, no wall portion is provided to connect and reinforce the winding end portions 71e.

As shown in FIG. 1, the second drive side scroll portion 72 includes a second drive side end plate 72a and a second drive side wall member 72b. The second driving side wall member 72b is formed into three lines, similarly to the above-described first driving side wall member 71b (see FIG. 2).
A second drive-side shaft portion 72c extending in the direction of the drive-side rotation axis CL1 is connected to the second drive-side end plate 72a. The second drive-side shaft portion 72c is rotatably provided with respect to the housing 3 via a second drive-side bearing 14 serving as a ball bearing. A discharge port 72d is formed in the second drive-side shaft portion 72c along the drive-side rotation axis CL1.

  The first drive side scroll part 71 and the second drive side scroll part 72 are fixed in a state where the tips (free ends) of the wall bodies 71b, 72b face each other. The first drive-side scroll portion 71 and the second drive-side scroll portion 72 are fixed to each other by bolts (wall fixing) fastened to a plurality of flange portions 73 provided in the circumferential direction so as to protrude radially outward. Unit 31.

The driven-side scroll member 90 has a driven-side end plate 90a provided substantially at the center in the axial direction (the horizontal direction in the drawing). A through hole 90h is formed in the center of the driven end plate 90a so that the compressed air flows to the discharge port 72d.
On both sides of the driven side end plate 90a, driven side wall bodies 91b and 92b are provided, respectively. The first driven side wall member 91b installed on the motor 5 side from the driven side end plate 90a is engaged with the first driving side wall member 71b of the first driving side scroll portion 71, and is moved from the driven side end plate 90a to the discharge port 3d side. The installed second driven side wall member 92b is engaged with the second drive side wall member 72b of the second drive side scroll portion 72.
As shown in FIG. 3, the first driven side wall body 91b is provided in three, that is, three. The three driven side wall members 9b are arranged at equal intervals around the driven side rotation axis CL2.

  A first support member 33 and a second support member 35 are provided at both ends in the axial direction (horizontal direction in the drawing) of the driven scroll member 90. The first support member 33 is disposed on the motor 5 side, and the second support member 35 is disposed on the discharge port 3d side. The first support member 33 is fixed to the distal end (free end) of the first driven side wall body 91b by a fastening member 25a such as a pin or a bolt, and the second support member 35 is a fastening member such as a pin or a bolt. 25b, the second driven side wall member 92b is fixed to the tip (free end) of the second driven side wall member 92b. A shaft portion 33 a is provided on the center shaft side of the first support member 33, and the shaft portion 33 a is fixed to the housing 3 via a first support member bearing 37. A shaft portion 35 a is provided on the center shaft side of the second support member 35, and the shaft portion 35 a is fixed to the housing 3 via a second support member bearing 38. Thus, the driven scroll member 90 rotates around the second central axis CL2 via the support members 33 and 35.

  The pin ring mechanism 15 is provided between the first support member 33 and the first drive side end plate 71a. That is, the ring member 15a is provided on the first driving side end plate 71a, and the pin member 15b is provided on the first support member 33.

  The pin ring mechanism 15 is provided between the second support member 35 and the second drive side end plate 72a. That is, the ring member 15a is provided on the second drive side end plate 72a, and the pin member 15b is provided on the second support member 35.

  FIG. 4 shows a state where the scroll members 70 and 90 are viewed from the directions of the rotation axes CL1 and CL2. As shown in the figure, the driving-side rotation axis CL1 and the driven-side rotation axis CL2 are offset by a turning radius when the scroll members 70 and 90 rotate at the same angular velocity. A flange portion 30 is provided in a region lateral to the straight line L1 connecting these rotation axes CL1 and CL2 and around the scroll members 70 and 90, and at this position, the dividing surface P of the housing 3 is bolted (see FIG. 1). ) Has been concluded. More specifically, the flange portion 30 is provided in a region passing through the rotation axes CL1 and CL2 and orthogonal to the straight line L1. Further, the flange portion 30 is provided inside the circumscribed circle C1 surrounding the scroll members 70 and 90.

The dual rotary scroll compressor 1C having the above configuration operates as follows.
When the drive shaft 6 is rotated around the drive-side rotation axis CL1 by the motor 5, the drive-side shaft portion 7c connected to the drive shaft 6 also rotates, so that the drive-side scroll member 70 rotates around the drive-side rotation axis CL1. Rotate. When the driving scroll member 70 rotates, the driving force is transmitted from the support members 33 and 35 to the driven scroll member 90 via the pin ring mechanism 15, and the driven scroll member 90 rotates around the driven rotation axis CL2. I do. At this time, when the pin member 15b of the pin ring mechanism 15 moves while being in contact with the ring member 15a, the scroll members 70 and 90 rotate in the same direction at the same angular velocity.
When the two scroll members 70 and 90 rotate, the air sucked in from the suction port of the housing 3 is sucked from the outer peripheral side of the two scroll members 70 and 90 and enters the compression chamber formed by the two scroll members 70 and 90. It is captured. Then, the compression chamber formed by the first driving side wall 71b and the first driven side wall 91b and the compression chamber formed by the second driving side wall 72b and the second driven side wall 92b are separately compressed. You. The volume of each compression chamber decreases as it moves toward the center, and the air is compressed accordingly. The air compressed by the first driving side wall body 71b and the first driven side wall body 91b passes through a through hole 90h formed in the driven side end plate 90a, and the second driving side wall body 72b, the second driven side wall body 92b, The compressed air merges with the compressed air, and the merged air passes through the discharge port 72d and is discharged from the discharge port 3d of the housing 3 to the outside. The discharged compressed air is guided to an internal combustion engine (not shown) and used as combustion air.

According to the present embodiment, the following operation and effect can be obtained.
In the case of the rotary scroll compressor 1A, the rotation axes CL1 and CL2 of the scroll members 70 and 90 are offset and provided in parallel by a distance that can form a compression chamber. Therefore, when both scroll members 70 and 90 are viewed from the rotation axis (see FIG. 4), the projected shape of both scroll members 70 and 90 is an oval shape having a long axis in the direction connecting rotation axes CL1 and CL2. Becomes Therefore, a space is created in a region on the side of the straight line L1 connecting the rotation axes CL1 and CL2 of the scroll members 70 and 90 and in the region around the scroll members 70 and 90. Since the flange portion 30 is provided in this region to fasten the dividing plane P, the outer shape of the housing 3 can be made as small as possible, and the dual rotary scroll compressor 1A can be made compact.
Further, as shown in FIG. 4, since the flange portion 30 is provided inside the circumscribed circle C1 surrounding the scroll members 70 and 90, the housing 3 can be made compact.
In this embodiment, two flange portions 30 are provided, but the present invention is not limited to this, and three or more flange portions 30 may be provided.
In addition, the installation position of the flange portion 30 is set in a region passing through the rotation axes CL1 and CL2 and orthogonal to the straight line L1 in FIG. 4, but is not limited to this region. It may be provided in a region rotated around CL1 and CL2.

[Second embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
In the present embodiment, a position where the mounting hole 80 is provided in the double rotary scroll compressor 1A of the first embodiment will be described. Therefore, FIG. 5 shows a compressor similar to the dual rotary scroll type compressor 1A of the first embodiment, and the position of the mounting hole 80 formed in the housing 3 is added.
The mounting hole 80 is used for connecting the double-rotating scroll compressor 1A to an external structure such as an engine. Specifically, it is used as a hole for mounting a mounting leg for mounting to an external structure.
As shown in FIG. 5, mounting holes 80 are formed on the outer peripheral side of the drive-side bearing 11 and the first support member bearing 37 and on the outer peripheral side of the second drive-side shaft 14 and the second support member bearing 38. Is formed. The mounting hole 80 is a through hole.

  As described above, in the present embodiment, attention has been paid to the fact that a predetermined space can be secured between the outer periphery of the bearings 11, 14, 37, and 38 and the outer shape of the housing 3. By providing the mounting hole 80 in this space, the mounting hole 80 can be formed without enlarging the outer shape of the housing 3, so that the dual rotary scroll compressor 1A can be made compact.

  As shown in FIG. 6, a mounting hole 80 as a bottomed hole may be provided on the outer peripheral side of the bearings 11, 14, 37, 38.

  In each of the above-described embodiments, a double-rotating scroll compressor is used as a supercharger. However, the present invention is not limited to this, and a wide-range compressor that compresses a fluid may be used. For example, it can be used as a refrigerant compressor used in an air conditioning machine.

1A Double scroll compressor 3 Housing 3a Motor housing 3b Scroll housing 3c Cooling fin 3d Discharge port 5 Motor (drive unit)
5a Stator 5b Rotor 6 Drive shaft 7c Drive side shaft portion 11 Drive side bearing 15 Pin ring mechanism (synchronous drive mechanism)
15a Ring member 15b Pin member 25a Fastening member 25b Fastening member 30 Flange part (fastening part)
31 bolt (wall fixing part)
32 bolt 33 first support member 33a shaft portion 35 second support member 35a shaft portion 37 first support member bearing 38 second support member bearing 70 drive side scroll member 71 first drive side scroll portion 71a first drive side end Plate 71b First drive side wall member 72 Second drive side scroll portion 72a Second drive side end plate 72b Second drive side wall member 72c Second drive side shaft portion 72d Discharge port 73 Flange portion 90 Follower scroll member 90a Follower end plate 90h Through hole 91b First driven side wall member 92b Second driven side wall member L1 Straight line P Dividing surface

Claims (3)

A drive-side scroll member that is rotationally driven by the drive unit and has a plurality of spiral drive side walls that are installed at predetermined angular intervals around the center of the drive-side end plate,
A plurality of spiral driven side walls are provided around the center of the driven side end plate at a predetermined angular interval and correspond to the respective driving side walls, and each of the driven side walls corresponds to the corresponding driving side wall. A driven scroll member that forms a compression space by being engaged with the body,
A synchronous drive mechanism for transmitting a driving force from the drive scroll member to the driven scroll member so that the drive scroll member and the driven scroll member rotate in the same direction at the same angular velocity,
A housing accommodating each of the scroll members and the synchronous drive mechanism;
With
The housing includes the scroll members, and a divided surface divided by a plane substantially orthogonal to the rotation axis of each of the scroll members,
A fastening portion that fastens the divided surface, in a side view and in a region around each of the scroll members when viewed from a straight line connecting the rotation axes of the scroll members ,
The double-rotating scroll compressor according to claim 1, wherein the fastening part is provided inside a circumscribed circle surrounding the driving scroll member and the driven scroll member .   2. The double-rotating scroll compressor according to claim 1, wherein the fastening portion is provided in a region substantially orthogonal to a straight line connecting each rotation axis of each of the scroll members. 3. A drive-side bearing that supports rotation of the drive-side scroll member;
A driven-side bearing that supports rotation of the driven-side scroll member;
With
The dual rotary scroll compressor according to claim 1 or 2 , wherein a mounting hole for mounting to an external structure is formed on an outer peripheral side of the driving side bearing and / or the driven side bearing.

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