JP2018141444A - Oldham joint structure, scroll compressor and refrigeration cycle system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve handleability of a movable scroll in a manufacturing process without enlarging an Oldham joint structure.SOLUTION: Only at one place on an outer peripheral surface in a movable scroll 34, a cutout 82 for avoiding interference with one stationary side key 91 is formed.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an Oldham joint structure, a scroll compressor, and a refrigeration circuit system.

  In Patent Document 1, in the Oldham ring, a pair of keys that fit into the movable scroll and a pair of keys that fit into the fixed scroll are formed on the same plane. Since the pair of keys that fit into the fixed scroll must protrude beyond the movable scroll, a pair of notches are formed on the outer peripheral surface of the movable scroll to avoid interference with these keys. .

Japanese Patent No. 2758193

The movable scroll has a disk shape, and a spiral wrap is formed on one end surface in the axial direction. In the process of manufacturing the movable scroll, if there are a pair of notches at an interval of 180 degrees on the outer peripheral surface, it becomes difficult to grip the movable scroll with a jig, which may affect work efficiency. That is, to grip the disk-shaped movable scroll, a three-jaw chuck is generally used. However, since there are claws at intervals of 120 degrees, one of the claws interferes with the notch. It becomes difficult to grip. On the other hand, if no notch is provided on the outer peripheral surface of the movable scroll, the pair of keys for the fixed scroll must be released radially outward of the movable scroll, and the Oldham joint structure is enlarged.
The subject of this invention is improving the handleability of the movable scroll in a manufacture process, suppressing the enlargement of an Oldham coupling structure.

An Oldham joint structure according to an aspect of the present invention is:
A disk-shaped fixed scroll in which a spiral fixed side wrap is formed on the other end surface in the axial direction;
A swirling movable side wrap is formed on one end surface in the axial direction, the swivel motion is performed with the movable side wrap meshed with the fixed side wrap and the one end surface slidably contacting the other end surface of the fixed scroll. A disc-shaped movable scroll to be transmitted;
One end surface in the axial direction is opposed to the other end surface of the movable scroll, and includes an annular Oldham ring that prevents the rotation of the movable scroll with respect to the fixed scroll and allows the revolution.
The fixed scroll has a pair of fixed-side key grooves extending in the first direction and arranged along the first direction at a position radially outside the fixed-side wrap on the other end surface in the axial direction. ,
The movable scroll has a pair of movable-side key grooves extending in the second direction orthogonal to the first direction and arranged along the second direction on the other end surface in the axial direction.
The Oldham ring has a pair of fixed-side keys slidably fitted to each of the fixed-side key grooves and a pair of slidably fitted to each of the movable-side key grooves on one end surface in the axial direction. A movable side key is formed,
The movable scroll has a notch for avoiding interference with one fixed side key only at one place on the outer peripheral surface.

  According to the present invention, since the notch is formed only at one place on the outer peripheral surface of the movable scroll, it is easy to grip even with the three-jaw chuck. Further, since there is one notch, it is not necessary for one fixed side key to escape radially outward of the movable scroll. This is established by the peculiarity of the involute curve in which the radius varies with the spiral angle. Therefore, the handleability of the movable scroll in the manufacturing process can be improved while suppressing an increase in the size of the Oldham joint structure.

It is a figure which shows a scroll compressor. It is a figure which shows a main frame. It is a figure which shows a fixed scroll. It is a figure which shows a movable scroll. It is a figure which shows an Oldham ring. It is a figure which shows the relationship between a keyway and a key. It is a figure which shows angle correction of a fixed side keyway. It is a figure which shows the state which the movable scroll has approached to the edge of the X direction. It is a figure which shows the state which the movable scroll revolved 90 degree | times counterclockwise from the state of FIG. FIG. 10 is a diagram showing a state in which the movable scroll has revolved 90 degrees counterclockwise from the state of FIG. 9.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Each drawing is schematic and may be different from the actual one. Further, the following embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the configuration is not specified as follows. That is, the technical idea of the present invention can be variously modified within the technical scope described in the claims.

<Embodiment>
"Constitution"
In the following description, for the sake of convenience, one end side in the axial direction is described as the upper side, and the other end side is described as the lower side.
FIG. 1 is a cross-sectional view showing a scroll compressor.
The scroll compressor 11 is mounted on a refrigeration circuit system for hot water supply, hot water supply heating, refrigeration, refrigeration, and the like, and compresses and discharges carbon dioxide (CO ₂ ) as a refrigerant of a working fluid.
The scroll compressor 11 is unitized by a shell 12.
The shell 12 includes a cylindrical barrel portion 13 extending in the axial direction, an upper lid 14 that closes the upper end side of the barrel portion 13, and a lower lid 15 that closes the lower end side of the barrel portion 13. Since the inside of the shell 12 has a high pressure, the shell 12 is sealed so as to maintain airtightness. A suction pipe 16 for sucking refrigerant is connected to the upper side of the body portion 13, and a discharge pipe 17 for discharging compressed refrigerant is connected to the upper surface of the upper lid 14.

An electric motor 21 and a scroll unit 31 are accommodated in the body portion 13 in order from the bottom. A subframe 22 for partitioning the inside of the body portion 13 in the vertical direction is fixed below the electric motor 21. The rotating shaft 23 of the electric motor 21 is rotatably supported at the lower end side by the sub frame 22 and is rotatably supported by the main frame 32 of the scroll unit 31 at the upper end side.
An oil storage chamber 25 for storing the lubricating oil 24 is formed at the bottom of the shell 12 by a section surrounded by the lower end of the body portion 13, the subframe 22, and the lower lid 15.

  The lower end side of the rotating shaft 23 passes through the subframe 22, and an oil pump 26 is attached to the tip thereof. The oil pump 26 sucks the lubricating oil 24 from the oil storage chamber 25, and supplies the lubricating oil 24 to a predetermined sliding portion, a bearing or the like through an oil supply passage 27 formed along the axial direction inside the rotary shaft 23. Supply. Thereby, lubrication and sealing of the sliding surface are performed at each sliding portion and bearing. Note that the discharge pressure of the refrigerant acts on the oil surface of the oil storage chamber 25, which also contributes to the lubricating oil 24 rising up the oil supply passage 27. Therefore, the outlet side of the oil supply passage 27 also has a high pressure environment equivalent to the compressed refrigerant pressure. A communication port 28 penetrating in the axial direction is formed in the sub-frame 22, and the lubricating oil 24 supplied to a predetermined sliding portion and the bearing is returned to the oil storage chamber 25 through the communication port 28.

The scroll unit 31 includes a main frame 32, a fixed scroll 33, a movable scroll 34, and an Oldham ring 35.
The main frame 32 is formed in a concave shape on the upper surface side, and a disk-shaped fixed scroll 33 is fixed so as to close the upper surface side of the main frame 32. A spiral fixed side wrap 36 is formed on the lower surface of the fixed scroll 33. The fixed side wrap 36 is formed at a position buried in the lower surface of the fixed scroll 33 so that the tip in the height direction does not exceed the lower surface of the fixed scroll 33.
The movable scroll 34 is formed in a disk shape, and a spiral movable side wrap 37 is formed on the upper surface thereof. The movable side wrap 37 is formed so as to protrude from the upper surface of the movable scroll 34. The movable scroll 34 meshes the movable side wrap 37 with the fixed side wrap 36, and the upper surface thereof is slidably in contact with the lower surface of the fixed scroll 33. A pressure chamber 38 for compressing the refrigerant is formed by a lower surface of the fixed scroll 33, a fixed side wrap 36, an upper surface of the movable scroll 34, and a section surrounded by the movable side wrap 37.

A boss 41 protruding downward is formed on the lower surface of the movable scroll 34. The upper end side of the rotary shaft 23 passes through the main frame 32, and a crank end portion 42 that is eccentric with respect to the rotary shaft 23 is formed at the front end thereof. The crank end portion 42 is movable scroll 34. The boss 41 is fitted in a rotatable state. Therefore, the rotational motion of the rotary shaft 23 is transmitted to the movable scroll 34 as a turning motion by the eccentric crank end portion 42.
The Oldham ring 35 is formed in an annular shape, and is disposed so that the upper surface thereof faces the lower surface of the movable scroll 34. The Oldham ring 35 prevents rotation of the movable scroll 34 and revolves with respect to the fixed scroll 33 by an Oldham joint structure described later. Is allowed.

On the lower surface side of the movable scroll 34, a high-pressure back pressure chamber 43 is formed on the radially inner side, and an intermediate pressure back pressure chamber 44 is formed on the radially outer side. The high pressure back pressure chamber 43 and the intermediate pressure back pressure chamber 44 are partitioned by a seal ring 45 provided in a seal groove of the main frame 32. A communication groove (not shown) extending in the radial direction is formed on the lower surface of the movable scroll 34, and this communication groove intermittently communicates the inside and outside of the seal ring 45 with the revolution of the movable scroll 34. To do.
Therefore, the back pressure chamber 43 is set to a high pressure by the lubricating oil 24 supplied from the oil supply passage 27, and the back pressure chamber 44 is set by the lubricating oil 24 supplied intermittently from the back pressure chamber 43 through the communication groove. An intermediate pressure lower than that of the back pressure chamber 43 is set. By the back pressure chamber 43 and the back pressure chamber 44, the movable scroll 34 is pressed against the lower surface of the fixed scroll 33 to ensure the sealing of the pressure chamber 38 and to prevent the occurrence of compression failure.

In the fixed scroll 33, a suction chamber 46 communicating with the suction pipe 16 is formed at the end of the involute curve in the fixed side wrap 36 (see FIG. 3). On the lower surface side of the fixed scroll 33, a back pressure control valve 47 is provided in the vicinity of the suction chamber 46 formed at the terminal portion of the fixed side wrap 36. The back pressure control valve 47 is a relief valve provided in a communication path that connects the intermediate pressure back pressure chamber 44 and the suction chamber 46 of the fixed side wrap 36, and when the pressure in the back pressure chamber 44 exceeds a set value. Open and allow pressure to escape to the suction chamber 46. Thereby, the pressure of the back pressure chamber 44 is maintained in an appropriate range.
A discharge hole 51 penetrating in the axial direction is formed in the center of the fixed scroll 33, and the discharge hole 51 is opened and closed by a discharge valve 52. The discharge valve 52 is covered with the discharge head 53 and suppresses the operation sound of the discharge valve 52.

On the radially outer side of the main frame 32 and the fixed scroll 33, through holes 54 penetrating in the axial direction are formed at a plurality of positions along the circumferential direction (see FIGS. 2 and 3). The region covered with the discharge head 53 communicates with the lower side of the scroll unit 31 through the through hole 54. There is a gap formed between the outer peripheral surface of the electric motor 21 and the inner peripheral surface of the body portion 13 by partially denting the outer peripheral surface of the stator.
On the outer peripheral surfaces of the main frame 32 and the fixed scroll 33, communication concave portions 55 are formed at a plurality of positions along the circumferential direction and are recessed along the circumferential direction over the entire surface in the axial direction (FIGS. 2 and 3). reference). A discharge chamber 56 that discharges the compressed refrigerant is formed in the upper portion of the shell 12 by a section surrounded by the upper end portion of the body portion 13, the fixed scroll 33, the discharge head 53, and the upper lid 14. The discharge chamber 56 communicates with the lower side of the scroll unit 31 through the communication recess 55.

Here, the flow of the refrigerant will be described.
The refrigerant is sucked into the pressure chamber 38 through the suction pipe 16 and the suction chamber 46. When the movable scroll 34 revolves with respect to the fixed scroll 33, the pressure chamber 38 is displaced toward the center of the scroll as seen from the axial direction, and the volume is reduced in the process, whereby the refrigerant is compressed. The compressed refrigerant is discharged from the discharge hole 51 and moves from the section covered with the discharge head 53 to the motor upper inner space 58 located below the scroll unit 31 via the through hole 54. Next, the electric motor 21 passes through the electric motor 21 while separating the mist-like oil contained in the refrigerant gas by utilizing the centrifugal separation action by the rotor of the electric motor 21. Next, it reaches the motor upper outer space 59 through a gap formed between the outer peripheral surface of the electric motor 21 and the inner peripheral surface of the body portion 13, and moves upward of the scroll unit 31 through the communication recess 55. Then, it is discharged through the discharge chamber 56 and the discharge pipe 17. The communication recess 55 is also used as a wiring space for the lead wire 57.

Next, the Oldham joint structure will be described.
In the following description, two directions orthogonal to each other in the direction perpendicular to the axis (plane direction) are referred to as an X direction (first direction) and a Y direction (second direction) for convenience.
FIG. 2 is a diagram illustrating the main frame.
In the figure, (a) is a perspective view of the main frame 32, (b) is a plan view of the main frame 32, and (c) is a cross-sectional view of the main frame 32.
On the upper surface side of the main frame 32, a central recess 61, an inner bottom surface 62, and an outer bottom surface 63 are formed in order from the center toward the radially outer side.

The central recess 61 is circular when viewed from the axial direction, and the boss 41 of the movable scroll 34 and the crank end portion 42 of the rotary shaft 23 are disposed here. The inner bottom surface 62 has an annular shape when viewed from the axial direction, and a seal ring 45 is provided here so that the lower surface of the movable scroll 34 contacts. The outer bottom surface 63 is annular when viewed from the axial direction, and is lower than the inner bottom surface 62, and the Oldham ring 35 is fitted therein.
On the inner peripheral surface of the outer peripheral wall of the main frame 32, a pair of inner peripheral recesses 64 that are recessed along the circumferential direction are formed according to the outer shape of the Oldham ring 35 and the movable range. Each of the pair of inner peripheral recesses 64 is formed at a position along which the center line along the X direction passes, and one inner peripheral recess 64 is recessed larger than the other inner peripheral recess 64.
A plurality of bolt holes used for fixing to the fixed scroll 33 are formed in the outer peripheral wall of the main frame 32 at predetermined intervals along the circumferential direction.

FIG. 3 is a diagram showing a fixed scroll.
(A) in the figure is a state in which the fixed scroll 33 is turned over, that is, a perspective view seen from the lower surface side, (b) is a plan view of the fixed scroll 33 seen from the lower surface side, and (c) is a fixed scroll. FIG.
When the fixed scroll 33 is viewed from the lower surface side, the fixed wrap 36 is configured by an involute curve drawn counterclockwise from the center side of the spiral toward the outside.
A pair of fixed-side key grooves 71 extending in the X direction and arranged along the X direction are formed on the lower surface of the fixed scroll 33 at a position radially outward from the fixed side wrap 36. A suction port 72 connected to the suction pipe 16 and communicating with the suction chamber 46 is formed on the outer peripheral surface of the fixed scroll 33. When the fixed scroll 33 is viewed from the lower surface side, each of the pair of fixed-side key grooves 71 has an involute curve moving radius based on an angular position where the suction chamber 46 is formed in the circumferential direction of the fixed scroll 33. It is formed in the range of 45 degrees to 135 degrees and the angle range of 225 degrees to 315 degrees in the decreasing direction (clockwise here). The moving radius is the length of a normal line that is orthogonal to the involute curve constituting the fixed side wrap 36 and is in contact with the base circle. This angle range is the same even when the fixed scroll 33 is viewed from the upper surface side.

As viewed from the axial direction, the fixed-side keyway 71 is formed at a position passing through the center line along the X direction passing through the center of the fixed scroll 33 or the center of the fixed-side wrap 36. The center of the fixed side wrap 36 is the center of the basic circle in the involute curve constituting the fixed side wrap 36.
The dimension of the fixed-side keyway 71 is set according to the outer shape and movable range of the fixed-side key 91 of the Oldham ring 35 described later. Regarding the arrangement, depending on the arrangement of the fixed side key 91, the arrangement is arranged at a different position from the center of the disk of the fixed scroll 33 or the center of the basic circle of the fixed side wrap 36. A communication recess 55 is formed on the radially outer side of the fixed side key 91 that is closer to the center of the disk of the fixed scroll 33 or the center of the base circle of the fixed side wrap 36. In order to secure a sealing surface that brings the main frame 32 and the fixed scroll 33 into close contact with each other, the fixed side key groove 71 is separated from the inner wall involute curve constituting the fixed side wrap 36 and the outer peripheral edge of the fixed scroll 33.
A plurality of bolt holes used for fixing to the main frame 32 are formed at predetermined intervals along the circumferential direction on the radially outer side of the fixed scroll 33. However, no bolt hole is provided on the extension line of the fixed-side key groove 71 or in the vicinity thereof.

FIG. 4 is a diagram illustrating the movable scroll.
In the figure, (a) is a perspective view of the movable scroll 34, (b) is a plan view of the movable scroll 34, and (c) is a cross-sectional view of the movable scroll 34.
When the movable scroll 34 is viewed from the upper surface side, the movable side wrap 37 is configured by an involute curve drawn clockwise from the center of the spiral toward the outside.
A pair of movable-side key grooves 81 extending in the Y direction and arranged along the Y direction are formed on the lower surface of the movable scroll 34. The dimension of the movable keyway 81 is set according to the outer shape and movable range of the movable key 92 of the Oldham ring 35 described later, and the radially outer side reaches the outer peripheral surface of the movable scroll 34.

  On the outer peripheral surface of the movable scroll 34, in order to avoid interference with the fixed side key 91 of the Oldham ring 35, which will be described later, only at one position on one side of the position passing through the center line along the X direction. A notch 82 is formed. When viewed from the axial direction, the shape of the notch 82 is formed symmetrically with respect to the center line along the X direction, and includes a long notch surface along the Y direction and a pair of short notches along the X direction. And a surface having a substantially U shape. The dimension of the notch 82 is set according to the outer shape of the fixed key 91 and the movable range.

FIG. 5 is a diagram illustrating an Oldham ring.
In the figure, (a) is a perspective view of the Oldham ring 35, (b) is a plan view of the Oldham ring 35, and (c) is a sectional view of the Oldham ring 35.
On the upper surface of the Oldham ring 35, a pair of fixed side keys 91 slidably fitted to each of the fixed side key grooves 71 and a pair of slidably fitted to each of the movable side key grooves 81. A movable side key 92 is formed. The fixed-side key 91 is formed on a base end portion 93 having a width wider than that of the fixed-side key groove 71 and a distal end surface of the base end portion 93, and is narrower than the base end portion 93. And a tip portion 94 that fits slidably.

  When viewed from the axial direction, the pair of fixed-side keys 91 are formed at positions through which the center line along the X direction passes, and are disposed at positions that are asymmetric with respect to the center line along the Y direction. That is, the pair of fixed-side keys 91 are located at different positions from the center point O of the Oldham ring 35, and one fixed-side key 91 is compared with the other fixed-side key 91 along the X direction from the center point O. It is arranged on the side going away. Accordingly, the Oldham ring 35 has a shape in which one side in the X direction is extended radially outward. As viewed from the axial direction, the pair of movable keys 92 is formed at a position where the center line along the Y direction passes, and is disposed at a target position with respect to the center line along the X direction. The distance b between the fixed keys 91 is set longer than the distance a between the movable keys 92.

FIG. 6 is a diagram illustrating the relationship between the keyway and the key.
(A) in the drawing shows the relationship between the fixed side keyway 71 and the fixed side key 91.
The axial gap c between the lower surface of the fixed scroll 33 and the distal end surface of the base end portion 93 is set to be smaller than the axial gap d between the bottom surface of the fixed side keyway 71 and the distal end surface of the distal end portion 94. Has been. That is, even if play occurs in the fixed scroll 33 or the Oldham ring 35 and the lower surface of the fixed scroll 33 and the front end surface of the base end portion 93 come into contact with each other, the bottom surface of the fixed side key groove 71 and the front end surface of the front end portion 94 Keeps out of contact. Note that the height of the base end portion 93 is set according to the thickness of the movable scroll 34. The fixed side keyway 71 and the fixed side key 91 are fitted with a predetermined clearance e1 in the width direction.

(B) in the figure shows the relationship between the movable keyway 81 and the movable key 92.
The axial gap f between the lower surface of the movable scroll 34 and the upper surface of the Oldham ring 35 is set to be smaller than the gap g between the bottom surface of the movable key groove 81 and the tip surface of the movable key 92. That is, even if play occurs in the movable scroll 34 or the Oldham ring 35 and the lower surface of the movable scroll 34 and the upper surface of the Oldham ring 35 come into contact with each other, the bottom surface of the movable key groove 81 and the tip surface of the movable key 92 are Keep out of contact. The movable side keyway 81 and the movable side key 92 are fitted with a predetermined clearance e2 in the width direction.
FIG. 7 is a diagram illustrating angle correction of the fixed side keyway.
Here, a pair of fixed-side key grooves 71 when the fixed scroll 33 is viewed from the upper end side (back side) are shown. The fixed-side keyway 71 is formed in the same direction as the rotation direction of the rotary shaft 23 with the angle shifted by an amount corresponding to the clearances e1 and e2. In addition, although the angle correction of the fixed side keyway 71 is schematically drawn, specifically, the rotation of the rotary shaft 23 by an amount corresponding to half of the sum of e1 and e2 (= {e1 + e2} / 2). It is formed by shifting the angle with respect to the center.

Here, the assembly of the Oldham joint structure will be described.
First, the Oldham ring 35 is fitted into the outer bottom surface 63 of the main frame 32 with the fixed side key 91 and the movable side key 92 facing up. At this time, it is arranged so that the fixed side key 91 far from the center point O of the Oldham ring 35 faces the larger inner circumferential recess 64 formed in the main frame 32 when viewed from the axial direction. Next, the movable scroll 34 is placed on the inner bottom surface 62 of the main frame 32 so that the movable side key groove 81 is fitted into the movable side key 92. At this time, it is arranged so that the cutout portion 82 of the movable scroll 34 faces the fixed side key 91 closer to the center point O of the Oldham ring 35 when viewed from the axial direction. Accordingly, the fixed side key 91 closer to the center point O protrudes upward from the movable scroll 34 through the notch 82, and the fixed side key 91 far from the center point O is in the radial direction of the movable scroll 34. Projects upward from the outside. Next, the fixed scroll 33 is engaged with the movable side wrap 37 and the fixed side keyway 71 is fitted into the fixed side key 91 so that the fixed scroll 33 is aligned with the main frame 32 and fastened by a plurality of bolts. To do.

Next, the movement of the Oldham joint structure will be described.
Since the fixed side key 91 is slidably fitted in the fixed side keyway 71, the fixed scroll 33 and the Oldham ring 35 are allowed only relative displacement in the X direction. Further, since the movable key 92 is slidably fitted in the movable key groove 81, the movable scroll 34 and the Oldham ring 35 are allowed only relative displacement in the Y direction. Therefore, when the turning motion is transmitted to the movable scroll 34, the relative displacement in the X direction and the relative displacement in the Y direction are individually allowed, so that the rotation of the movable scroll 34 is prevented and the movable scroll 34 is movable. Revolution of the scroll 34 is allowed. The Oldham ring 35 only moves linearly (reciprocates) along the X direction.
FIG. 8 is a diagram illustrating a state in which the movable scroll is close to the end in the X direction.
(A) in the figure is a plan view seen from the fixed scroll 33 side, and (b) in the figure is an enlarged view of one fixed side key 91.
The movable scroll 34 is close to the end on the side where the notch 82 is present in the X direction, and is substantially in the center in the Y direction.

FIG. 9 is a diagram showing a state in which the movable scroll has revolved 90 degrees counterclockwise from the state of FIG.
(A) in the figure is a plan view seen from the fixed scroll 33 side, and (b) in the figure is an enlarged view of one fixed side key 91.
The movable scroll 34 is close to one end in the Y direction, and is substantially in the center in the X direction.
FIG. 10 is a diagram showing a state in which the movable scroll has revolved 90 degrees counterclockwise from the state of FIG.
(A) in the figure is a plan view seen from the fixed scroll 33 side, and (b) in the figure is an enlarged view of the other fixed side key 91.
The movable scroll 34 is close to the end on the side where there is no notch 82 in the X direction, and is substantially in the center in the Y direction.

<Action>
Next, main functions and effects of the embodiment will be described.
If a pair of notches are formed on the outer peripheral surface of the movable scroll 34 at an interval of 180 degrees, when using a three-jaw chuck, one of the claws interferes with the notch and becomes difficult to grip. . On the other hand, if no cutout is provided on the outer peripheral surface of the movable scroll 34, both of the fixed side keys 91 must be released to the outside in the radial direction of the movable scroll 34, and the Oldham joint structure is enlarged. Therefore, a notch 82 for avoiding interference with one fixed side key 91 is formed only at one position on the outer peripheral surface of the movable scroll 34. This makes it easy to grip even a three-jaw chuck in which claws are present at intervals of 120 degrees. Further, since there is one notch portion 82, it is not necessary for one fixed side key 91 to escape to the radially outer side of the movable scroll 34. Therefore, the handleability of the movable scroll 34 in the manufacturing process can be improved while suppressing an increase in the size of the Oldham joint structure.

Since only one notch portion 82 is provided, the other fixed side key 91 must escape to the radially outer side of the movable scroll 34. Therefore, the Oldham ring 35 has a pair of fixed-side keys 91 arranged at asymmetric positions with respect to the center line along the Y direction, and is more than the distance a between the movable side keys 92 when viewed from the axial direction. The distance b between the fixed side keys 91 becomes longer. Thereby, interference with another fixed side key 91 and the movable scroll 34 can be avoided.
Regarding the relationship between the fixed-side keyway 71 and the fixed-side key 91, the axial gap c between the lower surface of the fixed scroll 33 and the distal end surface of the base end portion 93 is set to be between the bottom surface of the fixed side keyway 71 and the distal end portion 94. It is smaller than the gap d in the axial direction from the tip surface. Thereby, even if a backlash occurs in the fixed scroll 33 or the Oldham ring 35, it is possible to avoid contact between the bottom surface of the fixed side keyway 71 and the front end surface of the front end portion 94.

Regarding the relationship between the movable side keyway 81 and the movable side key 92, the axial gap f between the lower surface of the movable scroll 34 and the upper surface of the Oldham ring 35 is used as the bottom surface of the movable side keyway 81 and the tip of the movable side key 92. It is smaller than the gap g with the surface. Thereby, even if play occurs in the movable scroll 34 or the Oldham ring 35, it is possible to avoid contact between the bottom surface of the movable key groove 81 and the tip surface of the movable key 92.
The fixed-side keyway 71 is formed in the same direction as the rotation direction of the rotary shaft 23 with the angle shifted by an amount corresponding to the clearances e1 and e2. Specifically, the angle is shifted by an amount corresponding to half of the sum of e1 and e2. Thereby, the backlash of the width direction between the fixed side keyway 71 and the fixed side key 91 can be carried out at the time of a drive.

  A range from 45 degrees to 135 degrees in the direction in which the radius of the involute curve decreases (clockwise in this case) with the angular position where the suction chamber 46 is formed as a base point in the circumferential direction of the fixed scroll 33 when viewed from the axial direction. The fixed side keyway 71 is formed in an angle range of 225 degrees to 315 degrees. This is the angle range that is most easily laid out. That is, when the fixed scroll 33 is viewed from the lower surface side, the involute curve of the fixed side wrap 36 is drawn counterclockwise from the center side toward the outside. Therefore, the involute curve of the fixed side wrap 36 is the largest in the range from 0 to 45 degrees clockwise from the suction chamber 46 as a base point. Therefore, if the interference with the fixed side wrap 36 is avoided and the sealing surface is secured, the fixed scroll 33 is enlarged, so that it is desirable to avoid the fixed side key groove 71 also being disposed here. An angle range of 315 degrees to 0 degrees clockwise (angle range of 0 degrees to 45 degrees counterclockwise) is suitable for arranging the back pressure control valve 47. I want to avoid placing 71. That is, it is difficult to dispose the fixed-side key groove 71 in an angle range of ± 45 degrees and a total of 90 degrees centering on the angular position where the suction chamber 46 is formed. As described above, the optimum angle range for determining the fixed-side keyway 71 is determined in consideration of the layout requirements of other components.

Further, by forming both the fixed side key 91 and the movable side key 92 on the upper surface of the Oldham ring 35, an Oldham coupling structure for directly connecting the fixed scroll 33 and the movable scroll 34 is formed. Up to now, there has been an Oldham coupling structure in which only the movable side key 92 is formed on the upper surface of the Oldham ring 35 and the fixed side key for the main frame 32 is formed on the lower surface. However, since the fixed scroll 33 and the movable scroll 34 are indirectly connected, it is necessary to position and assemble the cores so that the cores coincide with each other, which may cause misalignment. On the other hand, by using an Oldham coupling structure that directly connects the fixed scroll 33 and the movable scroll 34, it is possible to suppress the above-described misalignment.
Moreover, since carbon dioxide is used as a refrigerant, warming is not promoted like hydrofluorocarbon (HFC). Moreover, there is no slight flammability like hydrofluoroolefin (HFO), flammability like hydrocarbon (HC), and no toxicity like ammonia. Therefore, it is particularly excellent in terms of environmental conservation.

<Modification>
In the embodiment, the substantially U-shaped notch 82 is formed on the movable scroll 34, but the present invention is not limited to this. For example, a linear notch portion formed only of a notch surface along the Y direction when viewed from the axial direction may be formed.
In the embodiment, the pair of fixed-side keys 91 are provided at positions where the center line along the X direction of the Oldham ring 35 passes, but the present invention is not limited to this. For example, at least one fixed side key 91 may be translated in the Y direction from a position along which the center line along the X direction passes. Accordingly, the notch 82 of the movable scroll 34 and the inner peripheral recess 64 of the main frame 32 may be translated from the position along the center in the X direction to the Y direction. According to this, the degree of freedom of layout can be improved.
Although the sealed scroll compressor 11 has been described in the embodiment, the present invention is not limited to this, and the present invention may be applied to a compressor other than the sealed type, or a scroll fluid device such as an expander.
In the embodiment, the vertical scroll compressor 11 has been described. However, the present invention is not limited to this, and may be applied to a horizontal type.

  Although the present invention has been described with reference to a limited number of embodiments, the scope of rights is not limited thereto, and modifications of the embodiments based on the above disclosure are obvious to those skilled in the art.

11 scroll compressor 33 fixed scroll 34 movable scroll 35 Oldham ring 36 fixed side wrap 37 movable side wrap 46 suction chamber 71 fixed side keyway 81 movable side keyway 82 notch 91 fixed side key 92 movable side key 93 base end 94 Tip

Claims (11)

A disk-shaped fixed scroll in which a spiral fixed side wrap is formed on the other end surface in the axial direction;
In a state where a spiral movable side wrap is formed on one end surface in the axial direction, the movable side wrap meshes with the fixed side wrap, and one end surface is slidably contacted with the other end surface of the fixed scroll, A disk-shaped movable scroll to which the orbiting motion is transmitted;
One end surface in the axial direction is opposed to the other end surface of the movable scroll, and includes an annular Oldham ring that prevents the movable scroll from rotating with respect to the fixed scroll and allows revolution.
The fixed scroll has a pair of fixed side key grooves extending in the first direction and aligned along the first direction at a position radially outside the fixed side wrap of the other end surface in the axial direction. Formed,
The movable scroll is formed with a pair of movable-side key grooves on the other end surface in the axial direction, extending in a second direction orthogonal to the first direction and arranged along the second direction,
The Oldham ring is fitted on one end surface in the axial direction so as to be slidable with respect to each of the fixed-side key groove and a pair of fixed-side keys and movably-side key grooves. A pair of matching movable keys are formed,
The Oldham joint structure characterized in that the movable scroll has a notch for avoiding interference with one of the fixed-side keys only at one place on the outer peripheral surface.   2. The Olddam ring according to claim 1, wherein a pair of the fixed-side keys are disposed at asymmetric positions with respect to a center line along the second direction when viewed from the axial direction. Oldham joint structure.   The Oldham ring structure according to claim 1, wherein the Oldham ring has a longer distance between the fixed-side keys than a distance between the movable-side keys when viewed from the axial direction. The fixed key is
A base end portion formed on one end surface in the axial direction of the Oldham ring, wider than the fixed-side keyway,
A distal end portion formed on the distal end surface of the proximal end portion, narrower than the proximal end portion, and slidably fitted to the fixed-side keyway,
The axial gap between the other end surface of the fixed scroll and the distal end surface of the base end portion is smaller than the axial gap between the bottom surface of the fixed key groove and the distal end surface of the distal end portion. The Oldham joint structure as described in any one of Claims 1-3.   The axial gap between the other end surface of the movable scroll and the one end surface of the Oldham ring is smaller than the clearance between the bottom surface of the movable side key groove and the front end surface of the movable side key. The Oldham joint structure as described in any one of -4. The stationary scroll has a refrigerant suction chamber formed on the end side of the involute curve constituting the stationary side wrap,
When the fixed scroll is viewed from the movable scroll side, each of the fixed side keyways is based on an angular position where the suction chamber is formed in the circumferential direction of the fixed scroll, and the movement of the involute curve. The Oldham joint structure according to any one of claims 1 to 5, wherein the Oldham joint structure is formed in an angle range of 45 to 135 degrees and an angle range of 225 to 315 degrees in a direction in which the diameter decreases. A rotating shaft for transmitting a turning motion to the movable scroll;
The fixed side keyway and the fixed side key are fitted with a predetermined clearance in the width direction,
The Oldham joint structure according to claim 6, wherein the fixed-side key grooves are formed in the same direction as the rotation direction of the rotation shaft, with an angle shifted by an amount corresponding to the clearance. A disk-shaped fixed scroll in which a spiral fixed side wrap is formed on the other end surface in the axial direction;
In a state where a spiral movable side wrap is formed on one end surface in the axial direction, the movable side wrap meshes with the fixed side wrap, and one end surface is slidably contacted with the other end surface of the fixed scroll, A disk-shaped movable scroll to which the orbiting motion is transmitted;
One end surface in the axial direction is opposed to the other end surface of the movable scroll, and includes an annular Oldham ring that prevents the movable scroll from rotating with respect to the fixed scroll and allows revolution.
The fixed scroll has a pair of fixed side key grooves extending in the first direction and aligned along the first direction at a position radially outside the fixed side wrap of the other end surface in the axial direction. Formed,
The movable scroll is formed with a pair of movable-side key grooves on the other end surface in the axial direction, extending in a second direction orthogonal to the first direction and arranged along the second direction,
The Oldham ring is fitted on one end surface in the axial direction so as to be slidable with respect to each of the fixed-side key groove and a pair of fixed-side keys and movably-side key grooves. A pair of matching movable keys are formed,
The stationary scroll has a refrigerant suction chamber formed on the end side of the involute curve constituting the stationary side wrap,
When the fixed scroll is viewed from the movable scroll side, each of the fixed side keyways is based on an angular position where the suction chamber is formed in the circumferential direction of the fixed scroll, and the movement of the involute curve. An Oldham joint structure characterized by being formed in an angle range of 45 to 135 degrees and an angle range of 225 to 315 degrees in a direction in which the diameter decreases.   The scroll compressor provided with the Oldham coupling structure as described in any one of Claims 1-8.   The scroll compressor according to claim 9, wherein the carbon dioxide refrigerant is compressed.   11. A refrigeration circuit system comprising the scroll compressor according to claim 9 and applied to any one of hot water supply, hot water heating / heating, refrigeration, and freezing.

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