CN110300853B

CN110300853B - Double-rotation scroll compressor

Info

Publication number: CN110300853B
Application number: CN201880011978.4A
Authority: CN
Inventors: 平田弘文; 伊藤隆英; 山下拓马
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Ltd
Priority date: 2017-02-17
Filing date: 2018-02-08
Publication date: 2020-10-27
Anticipated expiration: 2038-02-08
Also published as: US20200003213A1; EP3567252A4; JP6707478B2; JP2018132035A; CN110300853A; EP3567252B1; EP3567252A1; WO2018151014A1

Abstract

The double-orbiting scroll compressor includes a driving-side scroll member that is driven by a driving unit to orbit and has a spiral driving-side wall body disposed on a driving-side end plate, and a driven-side scroll member (90) that has a driven-side wall body disposed on a driven-side end plate (90a) and corresponding to the driving-side wall body, and forms a compression chamber by meshing the driven-side wall body with the driving-side wall body. The double-rotation scroll compressor is provided with a first support member (33), the first support member (33) is connected with the axial front end of a first driven side wall body (91b) through a positioning pin (40) for positioning the phase around the rotation axis and rotates with the first driven side wall body (91b), and the positioning pin (40) is pressed into the first support member (33) and is embedded into the first driven side wall body (91b) in a non-pressed state.

Description

Double-rotation scroll compressor

Technical Field

The present invention relates to a double-rotation scroll compressor.

Background

Conventionally, a double-orbiting scroll compressor is known (see patent document 1). The double-orbiting scroll compressor includes: the drive side scroll and the driven side scroll synchronously rotate together with the drive side scroll, and the driven shaft supporting the rotation of the driven side scroll is offset by the amount of the turning radius from the drive shaft rotating the drive side scroll, and further the drive shaft and the driven shaft are rotated in the same direction at the same angular velocity.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 5443132

In the double-orbiting scroll compressor, a structure may be adopted in which the tips of the spiral wall bodies of the drive-side scroll and the driven-side scroll are supported by a support member. In the case of such a structure, in order to ensure the engagement of the spiral wall body, positioning pins are provided for accurately positioning the phases of the drive-side scroll and the driven-side scroll around the rotation axis. However, if the positioning pin is press-fitted into the spiral wall body, the wall body may be deformed to impair the engagement between the wall bodies, and the performance and durability may be deteriorated.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide a twin scroll compressor which does not deteriorate performance and durability when a wall body is positioned by a positioning pin.

In order to solve the above problem, the double scroll compressor according to the present invention employs the following means.

That is, a twin scroll compressor according to an aspect of the present invention includes: a drive-side scroll member that is driven by the drive unit to rotate and that has a spiral drive-side wall body disposed on the drive-side end plate; a driven-side scroll member having a driven-side wall body disposed in a driven-side end plate and corresponding to the driving-side wall body, and forming a compression chamber by the driven-side wall body engaging with the driving-side wall body; and a synchronous drive mechanism that transmits a drive force from the drive-side scroll member to the driven-side scroll member so that the drive-side scroll member and the driven-side scroll member perform rotation motions in the same direction at the same angular velocity, wherein the double-scroll compressor is provided with a support member that is connected to an axial tip of at least one of the drive-side wall body and the driven-side wall body by a positioning pin that positions a phase around a rotation axis and is fitted into the wall body in a non-press-fitted state, and that rotates together with the wall body.

The drive-side wall body of the end plate disposed on the drive-side scroll member is engaged with the driven-side wall body corresponding to the driven-side scroll member. The drive-side scroll member is driven by the drive unit to rotate, and the drive force transmitted to the drive-side scroll member is transmitted to the driven-side scroll member via the synchronous drive mechanism. Thereby, the driven scroll member rotates and performs a rotation motion at the same angular velocity in the same direction with respect to the driving scroll member. Thus, a double-rotary scroll compressor in which both the drive-side scroll member and the driven-side scroll member rotate is provided.

The wall body and the support member are connected by a positioning pin. The positioning pin is press-fitted into the support member, and the positioning pin is fitted into the wall body in a non-press-fitted state. This makes it possible to firmly fix the positioning pin to the support member without causing deformation of the wall due to fitting of the positioning pin. Since the wall body does not deform in shape, the performance and durability are not reduced.

The term "fitting in a non-press-fit state" refers to fitting in a degree that a pin hole is deformed and enlarged by fitting of a positioning pin and does not cause deformation of the shape of a component, and examples thereof include clearance fitting.

In the double-orbiting scroll compressor according to the aspect of the present invention, the positioning pin is provided at least two positions around the rotation axis.

By providing two positioning pins, the position around the rotation axis can be determined.

In the double-orbiting scroll compressor according to one aspect of the present invention, the drive-side scroll member includes a first drive-side scroll portion having a first drive-side end plate and a first drive-side wall body and driven by the drive portion, and a second drive-side scroll portion; a second drive-side scroll part having a second drive-side end plate and a second drive-side wall body, wherein the driven-side scroll member includes a first driven-side wall body and a second driven-side wall body, and the first driven-side wall body is provided on one side surface of the driven-side end plate and engages with the first drive-side wall body; a second driven side wall body provided on the other side surface of the driven side end plate and engaged with the second driving side wall body, the double-scroll compressor including a first support member and a second support member, the first support member being disposed so as to sandwich the first driving side end plate therebetween, and being fixed to a tip end side of the first driven side wall body in the axial direction so as to rotate together with the first driven side wall body; the second support member is disposed so as to sandwich the second driving-side end plate, is fixed to a distal end side of the second driven-side wall body in the axial direction, and rotates together with the second driven-side wall body, and the positioning pins are provided between the first driven-side wall body and the first support member, and between the second driven-side wall body and the second support member.

When the driven-side scroll member includes the first driven-side wall body and the second driven-side wall body, positioning pins are provided between the driven-side scroll member and the support members to which the driven-side scroll member is connected.

ADVANTAGEOUS EFFECTS OF INVENTION

Since the positioning pin is press-fitted into the support member and is fitted into the wall body in a non-press-fitted state, the performance and durability are not deteriorated.

Drawings

Fig. 1 is a longitudinal sectional view showing a double scroll compressor according to a first embodiment of the present invention.

Fig. 2 is a partial longitudinal sectional view showing a periphery of a positioning pin provided in the first driven sidewall body.

Fig. 3 is a partial vertical cross-sectional view showing a modification of fig. 2.

Fig. 4 is a partial vertical cross-sectional view showing another modification of fig. 2.

Fig. 5 is a longitudinal sectional view showing a double scroll compressor according to a second embodiment.

Detailed Description

Hereinafter, an embodiment of the present invention will be described.

[ first embodiment ]

Fig. 1 shows a double-orbiting scroll compressor (scroll compressor) 1 according to a first embodiment. The twin scroll compressor 1 can be used as a supercharger for compressing combustion air (fluid) supplied to an internal combustion engine such as a vehicle engine.

The double-scroll compressor 1 includes: a housing 3; a motor (drive unit) 5 housed at one end side of the housing 3; and a drive-side scroll member 70 and a driven-side scroll member 90 housed in the other end side of the casing 3.

The housing 3 is provided in a substantially cylindrical shape, and includes: a motor housing portion 3a housing the motor 5, and a scroll housing portion 3b housing the

scroll members

70, 90.

Cooling fins 3c for cooling the motor 5 are provided on the outer periphery of the motor housing portion 3 a. A discharge port 3d for discharging compressed air (working fluid) is formed at an end of the scroll receiver 3 b. Although not shown in fig. 1, an air intake port for taking in air (working fluid) is provided in the housing 3.

The motor 5 is driven by supplying electric power from an unillustrated power supply source. The rotation of the motor 5 is controlled by a command from a control unit, not shown. The stator 5a of the motor 5 is fixed to the inner peripheral side of the housing 3. The rotor 5b of the motor 5 rotates about the drive-side rotation axis CL 1. The rotor 5b is connected to a drive shaft 6 extending on a drive-side rotation axis CL 1. The drive shaft 6 is connected to the first drive-side shaft portion 7c of the drive-side scroll member 70.

The drive-side scroll member 70 includes a first drive-side scroll portion 71 on the motor 5 side and a second drive-side scroll portion 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 body 71 b.

The first drive side end plate 71a is connected to a first drive side shaft portion 7c connected to the drive shaft 6, and extends in a direction orthogonal to the drive side rotation axis CL 1. The first drive side shaft portion 7c is rotatably provided in the housing 3 via a first drive side bearing 11 which is a ball bearing.

The first driving side end plate 71a is formed in a substantially circular disk shape in a plan view. As shown in fig. 2, a plurality of first driving-side wall bodies 71b are provided in a spiral shape on the first driving-side end plate 71 a. The first driving-side wall body 71b is disposed at equal intervals around the driving-side rotation axis CL 1.

The second drive-side scroll portion 72 includes a second drive-side end plate 72a and a second drive-side wall body 72 b. The second driving-side wall body 72b is provided in a plurality of spiral shapes, similarly to the first driving-side wall body 71b described above.

A second drive-side shaft portion 72c having a cylindrical shape and extending in the direction of the drive-side rotation axis CL1 is connected to the second drive-side end plate 72 a. The second drive side shaft portion 72c is rotatably provided in the housing 3 via a second drive side bearing 14 which is a ball bearing. A discharge port 72d is formed in the second drive-side end plate 72a along the drive-side rotation axis CL 1.

Two seal members 16 are provided between the second drive side shaft portion 72c and the housing 3 on the tip end side (left side in fig. 1) of the second drive side shaft portion 72c with respect to the second drive side bearing 14. The two seal members 16 and the second drive side bearing 14 are disposed with a predetermined interval in the direction of the drive side rotation axis CL 1. A lubricant, such as grease, which is a semi-solid lubricant, is sealed between the two seal members 16. One sealing member 16 may be provided. In this case, the lubricant is enclosed between the seal member 16 and the second drive side bearing 14.

The first drive-side scroll portion 71 and the second drive-side scroll portion 72 are fixed in a state in which the leading ends (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 wall fixing bolts (wall fixing portions) 31 fastened to a flange portion 73, and the flange portion 73 is provided at a plurality of positions in the circumferential direction so as to protrude outward in the radial direction.

The driven scroll member 90 has a driven end plate 90a located substantially at the center in the axial direction (horizontal direction in the drawing). A discharge through hole (through hole) 90h is formed in the center of the driven-side end plate 90a, and compressed air flows toward the discharge port 72 d.

A first driven-side wall 91b is provided on one side surface of the driven-side end plate 90a, and a second driven-side wall 92b is provided on the other side surface of the driven-side end plate 90 a. A first driven-side wall 91b provided from the driven-side end plate 90a toward the motor 5 engages with the first driving-side wall 71b of the first driving-side scroll 71, and a second driven-side wall 92b provided from the driven-side end plate 90a toward the discharge port 3d engages with the second driving-side wall 72b of the second driving-side scroll 72.

The first support member 33 and the second support member 35 are provided at both ends of the driven-side scroll member 90 in the axial direction (horizontal direction in the drawing). 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 outer peripheral front end (free end) of the first driven-side wall body 91b by the first support fixing bolt 34, and the second support member 35 is fixed to the outer peripheral front end (free end) of the second driven-side wall body 92b by the second support fixing bolt 36.

The first support member 33 and the first driven-side wall 91b are positioned about the driven-side rotation axis CL2 by the positioning pin 40 provided at an angular position different from that of the first support fixing bolt 34. Specifically, as shown in fig. 2, one end of the positioning pin 40 is inserted into the pin insertion hole 91b1 formed at the tip end of the first driven-side wall body 91b, and the other end of the positioning pin 40 is press-fitted into the first support member 33. The positioning pin 40 is fitted into the pin insertion hole 91b1 of the first driven side wall 91b in a non-press-fitted state. That is, the pin insertion hole 91b1 is deformed and enlarged by fitting the positioning pin 40, and thus the first driven-side wall body 91b is fitted so as not to deform.

The positioning pin 40 is provided at two places around the driven-side rotation axis CL 2. However, the positioning pins 40 may be provided at three or more positions. In this case, the third or more positioning pins 40 are not actually necessary for positioning, and therefore, are so-called dummy pins.

A positioning pin is similarly provided between the second support member 35 and the second driven-side wall body 92 b.

A shaft portion 33a is provided on the center axis side of the first support member 33, and the shaft portion 33a is fixed to the housing 3 via a first support member bearing 37. A shaft portion 35a is provided on the center axis side of the second support member 35, and the shaft portion 35a is fixed to the housing 3 via a second support member bearing 38. Thereby, the driven scroll member 90 rotates about the driven rotation axis CL2 via the support members 33 and 35.

A pin ring mechanism (synchronous drive mechanism) 15 is provided between the first support member 33 and the first drive-side end plate 71 a. That is, a rolling bearing (ring) 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 transmits a driving force from the driving scroll member 70 to the driven scroll member 90, and causes the

scroll members

70 and 90 to rotate in the same direction at the same angular velocity.

The double-orbiting scroll compressor 1 having the above-described structure operates as follows.

When the drive shaft 6 is rotated about the drive-side rotation axis CL1 by the motor 5, the first drive-side shaft portion 7c connected to the drive shaft 6 is also rotated, and thereby the drive-side scroll member 70 is rotated about the drive-side rotation axis CL 1. When the drive-side scroll member 70 rotates, the drive force is transmitted from the support 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 rotation axis CL 2. At this time, the pin members 15b of the pin ring mechanism 15 contact the inner peripheral surface of the circular hole and move, so that both

scroll members

70 and 90 perform rotation motions in the same direction at the same angular velocity.

When the

scroll members

70 and 90 perform the rotation and circling motion, air sucked from the suction port of the casing 3 is sucked from the outer peripheral sides of the

scroll members

70 and 90 and is received in the compression chamber formed by the

scroll members

70 and 90. Then, the compression chamber formed by the first driving-side wall body 71b and the first driven-side wall body 91b and the compression chamber formed by the second driving-side wall body 72b and the second driven-side wall body 92b are compressed, respectively. The volumes of the respective compression chambers decrease as the chambers move toward the center side, and air is compressed along with the decrease. The air compressed by the first driving-side wall body 71b and the first driven-side wall body 91b passes through the discharge through hole 90h formed in the driven-side end plate 90a, merges with the air compressed by the second driving-side wall body 72b and the second driven-side wall body 92b, and is discharged to the outside from the discharge port 3d of the casing 3 through the discharge port 72 d. 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 operational effects are exhibited.

The positioning pins 40 for positioning the driven

side wall bodies

91b and 92b and the support members 33 and 35 are press-fitted into the support members 33 and 35, and the positioning pins 40 are fitted into the driven

side wall bodies

91b and 92b in a non-press-fitted state. This can firmly fix the positioning pin 40 to the support members 33 and 35, and does not cause deformation of the driven-

side wall bodies

91b and 92b due to the fitting of the positioning pin 40. Since the driven

side wall bodies

91b and 92b are not deformed in shape in this way, the performance and durability of the twin scroll compressor 1 are not reduced.

As shown in fig. 3, a separate cylindrical collar 33b may be provided on the protruding portion of the first support member 33, and the positioning pin 40 may be press-fitted into the collar 33 b. Since the collar 33b is provided as a separate member from the first support member 33, the processing of the first support member 33 becomes easy. Further, by adjusting the height of the collar 33b, the facing distance between the

scroll members

70 and 90 can be adjusted. A similar collar can also be provided on the second support member 35.

As shown in fig. 4, the positioning pin 40 may be press-fitted into the first support member 33 through the collar 33 b. In this case, the positioning pin 40 may be press-fitted into the through hole of the collar 33b or may be clearance-fitted. A similar collar can also be provided on the second support member 35.

[ second embodiment ]

In the first embodiment, a so-called double-scroll type compressor in which wall bodies are provided on both sides in the axial direction in each scroll member is described, but in the second embodiment, a so-called single-scroll type compressor in which one wall body is formed in the axial direction is described.

Fig. 5 shows a double-orbiting scroll compressor 1A provided with a single wrap. The double scroll compressor 1A includes support members 20 and 22 that support

wall bodies

7b and 9b of the drive-side scroll member 7 and the driven-side scroll member 9, respectively. Although the periphery of the motor 5 shown in fig. 1 is not shown in fig. 5, the present embodiment has the same structure.

As shown in fig. 5, the drive side support member 20 is fixed to the tip (free end) of the drive side wall body 7b of the drive side scroll member 7 via a positioning pin 41. The positioning pin 41 is fitted into the driving side wall body 7b in a non-press-fitted state, and press-fitted into the driving side support member 20.

The driven scroll member 9 is interposed between the drive side bearing member 20 and the drive side scroll member 7. Therefore, the driven-side end plate 9a is disposed opposite to the driving-side support member 20.

The drive side support member 20 has a shaft portion 20a on the center side. The shaft portion 20a is rotatably attached to the housing 3 via a drive-side support member bearing 26 which is a ball bearing. Thereby, the drive side support member 20 rotates about the drive side rotation axis CL1, similarly to the drive side scroll member 7.

A pin ring mechanism 15' is provided between the driving-side support member 20 and the driven-side end plate 9 a. That is, the ring member 15a is provided on the driven-side end plate 9a, and the pin member 15b is provided on the driving-side support member 20.

The driven-side support member 22 is fixed to the tip (free end) of the driven-side wall body 9b of the driven-side scroll member 9 via a positioning pin 41. The positioning pin 41 is fitted into the driven side wall body 9b in a non-press-fitted state, and press-fitted into the driven side support member 22.

The drive-side scroll member 7 is interposed between the driven-side bearing member 22 and the driven-side scroll member 9. Therefore, the driving side end plate 7a is disposed opposite to the driven side support member 22.

The driven side support member 22 has a shaft portion 22a on the center side. The shaft portion 22a is rotatably attached to the housing 3 via a driven-side support member bearing 28 which is a ball bearing. Thus, the driven side support member 22 rotates about the driven side rotation axis CL2, similarly to the driven side scroll member 9.

Positioning pins 41 for positioning

wall bodies

7b and 9b and support members 20 and 22 are press-fitted into support members 20 and 22, and positioning pins 40 are fitted into

wall bodies

7b and 9b in a non-press-fitted state. This can firmly fix the positioning pin 41 to the support members 20 and 22, and does not cause deformation of the

wall bodies

7b and 9b due to fitting of the positioning pin 41. In this way, since the

wall bodies

7b and 9b are not deformed in shape, the performance and durability of the twin scroll compressor 1A are not deteriorated.

In the above embodiments, the twin scroll compressor is used as the supercharger, but the present invention is not limited to this, and can be widely used as a device for compressing fluid, and can also be used as a refrigerant compressor used in, for example, an air conditioner. The scroll compressor 1 of the present invention can be applied to an air brake device that uses the force of air as a brake system for a railway vehicle.

Description of the symbols

1. 1A double-rotation scroll compressor

3 case

3a Motor housing part

3b scroll storage part (casing)

3c cooling fin

3d discharge port

5 Motor (Driving part)

5a stator

5b rotor

6 drive shaft

7 drive side scroll Member

7a drive side end plate

7b drive side wall body

7c first drive side shaft part

9 driven side scroll member

9a driven side end plate

9b driven sidewall

11 first drive side bearing

14 second drive side bearing

15. 15' Pin ring mechanism (synchronous driving mechanism)

15b pin member

16 sealing member

20 drive side bearing

20a shaft part

22 driven side bearing part

22a shaft part

26 bearing for driving side supporting member

28 bearing for driven side bearing member

31 wall body fixing bolt (wall body fixing part)

33 first support member

33a shaft part

33b collar

34 first support fixing bolt

35 second support member

35a shaft part

36 second support fixing bolt

37 bearing for first support member

38 bearing for second support member

40. 41 positioning pin

70 drive side scroll member

71 first drive side scroll part

71a first driving side end plate

71b first driving side wall body

72 second drive side scroll part

72a second drive side end plate

72b second driving sidewall

72c second drive side shaft section

72d discharge port

73 flange part

90 driven side scroll member

90a driven side end plate

90h discharge through hole (through hole)

91b first driven side wall

91b1 Pin insertion hole

92b second driven sidewall body

CL1 drive side axis of rotation

CL2 driven side axis of rotation

Claims

1. A double-orbiting scroll compressor, comprising:

a drive-side scroll member that is driven by the drive unit to rotate and that has a spiral drive-side wall body disposed on the drive-side end plate;

a driven-side scroll member having a driven-side wall body disposed in a driven-side end plate and corresponding to the driving-side wall body, and forming a compression chamber by the driven-side wall body engaging with the driving-side wall body; and

a synchronous drive mechanism that transmits a drive force from the drive-side scroll member to the driven-side scroll member so that the drive-side scroll member and the driven-side scroll member perform rotational motions in the same direction at the same angular velocity,

the double-orbiting scroll compressor includes a support member connected to a tip end of at least one of the driving-side wall body and the driven-side wall body in an axial direction by a positioning pin that positions a phase around a rotation axis, the support member rotating together with the at least one of the driving-side wall body and the driven-side wall body,

the positioning pin is press-fitted into the support member and is fitted into at least one of the driving-side wall body and the driven-side wall body in a non-press-fitted state.

2. The dual orbiting scroll compressor of claim 1,

the positioning pin is provided with at least two places around the rotation axis.

3. The twin scroll type compressor according to claim 1 or 2,

the drive-side scroll member includes a first drive-side scroll portion having a first drive-side end plate and a first drive-side wall body and driven by the drive portion, and a second drive-side scroll portion having a second drive-side end plate and a second drive-side wall body,

the driven scroll member includes a first driven-side wall body provided on one side surface of the driven-side end plate and engaging with the first driving-side wall body, and a second driven-side wall body provided on the other side surface of the driven-side end plate and engaging with the second driving-side wall body,

the double-orbiting scroll compressor includes a first support member disposed so as to sandwich the first drive-side end plate and fixed to a distal end side in an axial direction of the first driven-side wall body so as to rotate together with the first driven-side wall body, and a second support member disposed so as to sandwich the second drive-side end plate and fixed to a distal end side in an axial direction of the second driven-side wall body so as to rotate together with the second driven-side wall body,

the positioning pins are provided between the first driven sidewall body and the first support member, and between the second driven sidewall body and the second support member.