WO2019225191A1

WO2019225191A1 - Scroll compressor

Info

Publication number: WO2019225191A1
Application number: PCT/JP2019/015650
Authority: WO
Inventors: 義友塚
Original assignee: ダイキン工業株式会社
Priority date: 2018-05-22
Filing date: 2019-04-10
Publication date: 2019-11-28
Also published as: JP2019203419A; JP6617791B2

Abstract

In order that operating efficiency of a scroll compressor (1) is suppressed from lowering by suppressing a lubricant oil in an annular space (45) between an outer peripheral wall (37) of a housing (30) and an Oldham ring (70) from becoming resistance against motion of the Oldham ring (70) when a movable scroll (60) makes eccentric rotation, a space communication part (40) is formed in the housing (30). The space communication part (40) discharges the oil from the annular space (45) between the Oldham ring (70) and the outer peripheral wall (37) positioned in a periphery of the Oldham ring (70) to an oil discharging space (46) between a fixed scroll (50) and a Oldham ring supporting surface (36) of the housing (30).

Description

Scroll compressor

This disclosure relates to a scroll compressor.

Scroll compressors are used, for example, to compress fluid such as refrigerant in a refrigerant circuit (see Patent Document 1). The scroll compressor of patent document 1 is provided with the compression mechanism which has a fixed scroll and a movable scroll. The fixed scroll includes a disk-shaped fixed side end plate and a spiral fixed side wrap provided upright on the fixed side end plate. The movable scroll has a disk-shaped movable side end plate and a movable side wrap provided upright on the movable side end plate, and is driven by a drive shaft.

The fixed scroll is fixed to the housing, and the movable scroll is prevented from rotating by the Oldham ring held by the housing, and only revolving (eccentric rotation) is possible.

In the scroll compressor of Patent Document 1, an outer peripheral wall located around the Oldham ring is formed in the housing. The Oldham ring has a first key that engages with a keyway of the housing, and reciprocates in a first direction perpendicular to the axis of the drive shaft. The Oldham ring also has a second key that engages the keyway of the movable scroll. The movable scroll reciprocates in the second direction perpendicular to the first direction with respect to the Oldham ring, and the housing rotates eccentrically without rotating due to the intervention of the Oldham ring. (Revolution) Exercise.

In the compression mechanism, a fluid chamber (a suction chamber and a compression chamber) is formed between each lap by meshing the scrolls of both. In the compression mechanism, when the movable scroll performs an eccentric rotational motion with respect to the fixed scroll, the volume of the compression chamber gradually decreases. As a result, the fluid is compressed in the compression chamber.

JP 2014-029117 A

When the movable scroll rotates eccentrically, the Oldham ring reciprocates with respect to the housing as described above. Therefore, with the eccentric rotation of the movable scroll, the annular space between the Oldham ring and the outer peripheral wall repeatedly expands and contracts. Lubricating oil that has lubricated the compression mechanism is accumulated in the annular space. Therefore, when this annular space is reduced, the lubricating oil becomes resistance to the operation of the Oldham ring, and the efficiency of the compressor is lowered.

The purpose of the present disclosure is to prevent the lubricating oil in the annular space between the outer peripheral wall of the housing and the Oldham ring from becoming a resistance to the operation of the Oldham ring when the movable scroll rotates eccentrically. It is to suppress the decline.

A first aspect of the present disclosure is a scroll compressor,
A casing (10);
A housing (30) provided in the casing (10);
A fixed scroll (50) fixed to the housing (30);
A movable scroll (60) disposed between the housing (30) and the fixed scroll (50), meshed with the fixed scroll (50) and performing eccentric rotational movement with respect to the fixed scroll (50);
An Oldham ring (70) disposed between the housing (30) and the movable scroll (60) and restricting the rotation of the movable scroll (60),
The housing (30) has an annular space between the Oldham ring support surface (36) supporting the Oldham ring (70) and the Oldham ring (70) and the Oldham ring (70). 45), an outer peripheral wall (37), a fixed-side key groove (35) in which the fixed-side key (72) of the Oldham ring (70) is slidably fitted, and a first end (41a) An oil drainage space (46) between the fixed scroll (50) and the Oldham ring support surface (36) is communicated with the outer peripheral end of the fixed keyway (35) and the second end (41b) is between the fixed scroll (50) and the Oldham ring support surface (36). And a space communication portion (40) communicating with the space.

In the first aspect, when the Oldham ring (70) moves along the fixed-side keyway (35) during the eccentric rotation of the movable scroll (60), a part of the volume of the annular space (45) is reduced. The lubricating oil in the annular space (45) and the fixed-side keyway (35) is discharged through the space communication portion (40) to the oil discharge space (46). Therefore, it is suppressed that compressive force acts on lubricating oil, and the efficiency fall of a compressor is suppressed.

According to a second aspect of the present disclosure, in the first aspect,
The space communication part (40) is connected to the first communication part (41) extending in the circumferential direction from the outer peripheral end of the fixed keyway (35) of the housing (30), and the first communication part (41). A second communication portion (42) communicating with and opening to the Oldham ring support surface (36) is provided.

In the second aspect, when a part of the annular space (45) is reduced during the eccentric rotation of the movable scroll (60), the lubricating oil is communicated with the first communication portion (41) and the second communication portion of the space communication portion (40). Through the portion (42), the oil is discharged from the annular space (45) (and the fixed-side keyway (35)) to the oil discharge space (46). Therefore, it is possible to suppress a reduction in the efficiency of the compressor with a simple configuration in which the first communication portion (41) and the second communication portion (42) are formed in the housing (30).

According to a third aspect of the present disclosure, in the second aspect,
The housing (30) includes a first frame (31) having the outer peripheral wall (37), an outer peripheral surface (44) fitted to an inner peripheral surface (43) of the outer peripheral wall (37), and the Oldham ring support. A second frame (32) having a surface (36),
The first communication part (41) includes a circumferential groove (47) formed in the inner peripheral surface (43) of the first frame (31) or the outer peripheral surface (44) of the second frame (32). It is characterized by being.

In the third aspect, the housing (30) is provided with the first frame (31) and the second frame (32), and the first communication portion (41) serves as the inner peripheral surface (43) of the first frame (31). Alternatively, since the circumferential groove (47) formed on the outer peripheral surface (44) of the second frame (32) is used, the Oldham ring (70) becomes the resistance of the lubricating oil when the movable scroll (60) rotates eccentrically. It is possible to easily put the configuration that suppresses this into practical use.

According to a fourth aspect of the present disclosure, in the third aspect,
The second frame (32) is formed with a convex portion (38) in which a portion including the fixed-side keyway (35) formed in the second frame (32) protrudes radially outward. One frame (31) is formed with a recess (39) for receiving the protrusion (38),
The circumferential groove (47) is formed on the outer peripheral surface of the convex portion (38).

In the fourth aspect, in the configuration in which the convex portion (38) is formed in the second frame (32) and the concave portion (39) is formed in the first frame (31), the circumference formed in the convex portion (38). The direction groove (47) serves as the first communication portion (41), and the lubricating oil in the annular space (45) and the fixed-side key groove (35) is discharged to the oil discharge space (46).

According to a fifth aspect of the present disclosure, in the fourth aspect,
A gap (48) is formed between the convex portion (38) and the concave portion (39),
The second communication part (42) includes the gap (48).

In a 5th aspect, from the circumferential groove | channel (47) formed in the convex part (38) as the 1st communication part (41), the convex part (38) formed as the 2nd communication part (42), and a recessed part ( The lubricating oil in the annular space (45) and the fixed-side keyway (35) is discharged into the oil drainage space (46) through the gap (48) between them and 39).

According to a sixth aspect of the present disclosure, in any one of the third to fifth aspects,
The first communication part (41) is formed in the second frame (32).

According to a seventh aspect of the present disclosure, in any one of the third to fifth aspects,
The first communication part (41) is formed in the first frame (31).

In the sixth and seventh aspects, the second communication opening from the first communication part (41) formed in the second frame (32) or the first frame (31) to the Oldham ring support surface (36). Through the part (42), the lubricating oil in the annular space (45) and the fixed-side keyway (35) is discharged to the oil drainage space (46).

According to an eighth aspect of the present disclosure, in any one of the second to seventh aspects,
The second communication portion (42) is formed by an axial hole (32c) formed on both sides of the fixed-side keyway (35) and opening in the Oldham ring support surface (36).
The first communication part (41) is formed in the circumferential direction of the housing (30) from the fixed-side key groove (35) to the axial hole (32c).

In the eighth aspect, the lubricating oil in the annular space (45) and the fixed-side keyway (35) passes from the first communication portion (41) through the axial hole (32c) which is the second communication portion (42). And discharged to the oil drain space (46). The configuration of the axial hole (32c) can be simplified by using a hole already provided in the housing (30) such as a bolt hole.

According to a ninth aspect of the present disclosure, in any one of the second to seventh aspects,
The fixed-side keyway (35) is a pair of keyways arranged on the housing (30) with the axis of the eccentric rotational motion of the movable scroll (60) interposed therebetween,
The first communication part (41) is configured by a passage communicating from one of the pair of key grooves to the other,
The second communication portion (42) is configured by the other of the pair of key grooves.

In the ninth aspect, since the other of the fixed side keyway (35) is used for the second communication portion (42), it is possible to obtain a high effect in that the configuration can be simplified.

According to a tenth aspect of the present disclosure, in the first aspect,
The housing (30) includes a first frame (31) having the outer peripheral wall (37), an outer peripheral surface (44) fitted to an inner peripheral surface (43) of the outer peripheral wall (37), and the Oldham ring support. A second frame (32) having a surface (36),
On the inner surface of the outer peripheral wall (37) of the first frame (31), the outer peripheral end of the fixed side keyway (35) formed in the second frame (32) and the oil drainage space (46), A third communication portion (49) communicating along the axial direction of the first frame (31) is formed as the space communication portion (40).

In the tenth aspect, the lubricating oil in the annular space (45) and the fixed-side keyway (35) is discharged to the oil discharge space (46) through the third communication portion (49). Therefore, it is suppressed that compressive force acts on lubricating oil, and the efficiency fall of a compressor is suppressed.

An eleventh aspect of the present disclosure is the tenth aspect,
The outer peripheral wall (37) of the first frame (31) has a thick part (37a) and a thin part (37b) located above the thick part (37a),
While the thick part (37a) is fitted to the outer peripheral surface of the second frame (32), the third communication part (49) is provided between the thin part (37b) and the second frame (32). Is formed.

In the eleventh aspect, the third communicating portion (49) in which the lubricating oil in the annular space (45) and the fixed-side keyway (35) is formed between the thin portion (37b) and the second frame (32). And is discharged into the oil drainage space (46). Therefore, with a simple configuration, it is possible to suppress the compression force from acting on the lubricating oil, and it is possible to suppress a reduction in the efficiency of the compressor.

FIG. 1 is a longitudinal sectional view of a scroll compressor according to the first embodiment. FIG. 2 is a longitudinal sectional view showing a main part of the scroll compressor shown in FIG. FIG. 3 is a plan view showing the configuration of the first frame shown in FIG. FIG. 4A is a plan view showing the configuration of the second frame shown in FIG. 4B is a cross-sectional view taken along the line IVB-IVB in FIG. 4A. FIG. 5 is a plan view showing the configuration of the movable scroll shown in FIG. FIG. 6 is a plan view showing the configuration of the Oldham ring shown in FIG. FIG. 7 is a diagram illustrating behavior of the movable scroll and the Oldham ring in the operation operation of the scroll compressor according to the first embodiment. FIG. 8 is a plan view illustrating a configuration of a second frame of the scroll compressor according to the second embodiment. FIG. 9 is a plan view showing configurations of the first frame and the second frame of the scroll compressor according to the third embodiment. FIG. 10 is a plan view illustrating configurations of the first frame and the second frame of the scroll compressor according to the first modification of the third embodiment. FIG. 11 is a plan view illustrating the configuration of the first frame and the second frame of the scroll compressor according to the second modification of the third embodiment. FIG. 12 is a plan view illustrating the configuration of the first frame and the second frame of the scroll compressor according to the third modification of the third embodiment. FIG. 13 is a cross-sectional view illustrating a main part of the scroll compressor according to the fourth embodiment.

Embodiment 1
The first embodiment will be described. In this specification, “axial direction” represents the direction of the central axis of the drive shaft (22), and “circumferential direction” represents the circumferential direction of a circle or arc centered on the drive shaft (22). .

FIG. 1 is a longitudinal sectional view of a scroll compressor (1) according to the first embodiment. The scroll compressor (1) is provided, for example, in a vapor compression refrigerant circuit (not shown) and compresses a working fluid such as a refrigerant. For example, in the refrigerant circuit, the refrigerant compressed by the scroll compressor (1) is condensed by the condenser and then decompressed by the decompression mechanism, and then evaporated by the evaporator and sucked into the scroll compressor (1). The above is repeated as one cycle. The scroll compressor (1) includes a casing (10), a compression mechanism (20), an electric motor (21), and a drive shaft (22).

〔casing〕
The casing (10) is formed in a vertically long cylindrical shape closed at both ends. In the casing (10), a compression mechanism (20) and an electric motor (21) are accommodated in order from the upper side. The compression mechanism (20) and the electric motor (21) are connected by a drive shaft (22) extending in the axial direction (vertical direction) in the casing (10).

The casing (10) is provided with a suction pipe (11) and a discharge pipe (12). The suction pipe (11) passes through the upper part of the casing (10) in the axial direction and is connected to the compression mechanism (20), and introduces a low-pressure fluid (for example, a gas refrigerant) into the compression mechanism (20). The discharge pipe (12) penetrates the body of the casing (10) in the radial direction and communicates with the internal space of the casing (10), and the high-pressure fluid in the casing (10) is led out of the casing (10). To do.

An oil reservoir (13) for storing lubricating oil is provided at the bottom of the casing (10). A bearing member (14) is provided in the casing (10) below the electric motor (21). The bearing member (14) has a through hole formed in the center thereof, and the drive shaft (22) is inserted through the through hole. With such a configuration, the bearing member (14) rotatably supports the drive shaft (22).

[Compression mechanism]
The compression mechanism (20) is accommodated in the casing (10). The compression mechanism (20) is configured to compress the fluid introduced via the suction pipe (11) and discharge it into the casing (10). A specific configuration of the compression mechanism (20) will be described later.

〔Electric motor〕
The electric motor (21) is accommodated in the casing (10) and is disposed below the compression mechanism (20). The electric motor (21) has a stator (21a) and a rotor (21b). The stator (21a) is formed in a cylindrical shape and is fixed to the casing (10). A core cut that penetrates the stator (21a) in the axial direction is provided on the outer peripheral surface of the stator (21a). The core cut is a part where the outer peripheral surface of the stator (21a) is formed in a flat shape, and fluid flows through the gap between the stator (21a) and the casing (10). The stator (21a) is cooled by moving the space. The rotor (21b) is formed in a cylindrical shape, and is rotatably inserted through the inner periphery of the stator (21a). The drive shaft (22) is inserted and fixed to the inner periphery of the rotor (21b).

(Drive shaft)
The drive shaft (22) has a main shaft portion (22a), an eccentric shaft portion (22b), and a counterweight portion (22c). The main shaft portion (22a) extends in the axial direction (vertical direction) of the casing (10). The eccentric shaft portion (22b) is provided at the upper end of the main shaft portion (22a). The eccentric shaft portion (22b) has an outer diameter smaller than the outer diameter of the main shaft portion (22a), and the shaft center is eccentric by a predetermined distance with respect to the shaft center of the main shaft portion (22a). . The counterweight portion (22c) protrudes radially outward from the main shaft portion (22a), and is configured to achieve a dynamic balance during rotation.

Also, an oil supply passage (22d) is formed inside the drive shaft (22). The oil supply passage (22d) is configured to compress the lubricating oil stored in the bottom portion (oil sump portion (13)) of the casing (10) and the journal bearing portion (for example, the drive shaft (22) and the bearing member (14). And the like. A suction nozzle (22e) is provided at the lower end of the drive shaft (22). The suction nozzle (22e) is a member for sucking up the lubricating oil from the oil reservoir (13), and constitutes a capacity type pump. The suction port (lower end opening in FIG. 1) of the suction nozzle (22e) is immersed in the oil reservoir (13), and the discharge port (upper end opening in FIG. 1) of the suction nozzle (22e) is in the oil supply passage (22d). It communicates with the inflow end (the lower end in FIG. 1).

[Configuration of compression mechanism]
Next, the configuration of the compression mechanism (20) will be described with reference to FIGS. The compression mechanism (20) includes a housing (30), a fixed scroll (50), a movable scroll (60), and an Oldham ring (70). The housing (30) is provided in the casing (10). The fixed scroll (50) is fixed to the upper surface of the housing (30). The movable scroll (60) is disposed between the housing (30) and the fixed scroll (50), and is configured to engage with the fixed scroll (50) to perform an eccentric rotational motion with respect to the fixed scroll (50). ing. The Oldham ring (70) is disposed between the housing (30) and the movable scroll (60), and is configured to restrict the rotation of the movable scroll (60).

<housing>
The housing (30) is fixed in the casing (10), and divides the internal space of the casing (10) into two spaces in the axial direction. The space above the housing (30) constitutes the first space (S1), and the space below the housing (30) constitutes the second space (S2). On the other hand, the housing (30) and the fixed scroll (50) communicate with the first space (S1) above the housing (30) and the second space (S2) below the housing (30). A communication passage (75) described later is formed between the casing (10) and a part of the outer periphery.

The housing (30) has a first frame (31) and a second frame (32) disposed between the Oldham ring (70) and the first frame (31). An accommodation space (S30) in which the counterweight part (22c) of the drive shaft (22) is accommodated is formed between the first frame (31) and the second frame (32).

<< First frame >>
As shown in FIGS. 2 and 3, the first frame (31) is formed in a thick disk shape, and its outer peripheral surface is fixed to the inner peripheral surface of the casing (10). The outer peripheral edge (outer peripheral wall (53)) of the fixed scroll (50) is fixed to the outer peripheral edge of the first frame (31). The first frame (31) is provided with a first recess (31a), a second recess (31b), and a bulging portion (31c).

The first recess (31a) is recessed in the axial direction (downward in FIG. 2) from the fixed scroll (50) at the center of the surface (upper surface in FIG. 2) facing the fixed scroll (50). The first recess (31a) is formed in a circular shape in plan view. That is, the first recess (31a) is a recess having a substantially circular cross section that opens on the upper surface of the first frame (31).

The second recess (31b) is recessed in the axial direction (downward in FIG. 2) from the center of the bottom surface of the first recess (31a). The second recess (31b) is formed in a circular shape in plan view. That is, the second recess (31b) is a recess having a substantially circular cross section that opens at the bottom surface of the first recess (31a). The second recess (31b) is formed in a circular shape that is smaller in plan view than the shape of the first recess (31a).

The bulging part (31c) bulges from the upper part of the first frame (31) in a direction away from the fixed scroll (50) (downward in FIG. 2). A through hole penetrating the bulging portion (31c) in the axial direction is formed at the center of the bulging portion (31c), and a bearing metal (31d) is attached to the through hole. And the large diameter part of the upper end part of the main-shaft part (22a) of a drive shaft (22) is penetrated by the bearing metal (31d). With this configuration, the bulging portion (31c) rotatably supports the upper end portion (large diameter portion) of the main shaft portion (22a) of the drive shaft (22).

《Second frame》
As shown in FIGS. 2, 4 </ b> A, and 4 </ b> B, the second frame (32) is formed in an annular plate shape. The external shape of the second frame (32) has a shape corresponding to the first concave portion (31a) of the first frame (31) (a shape fitted to the first concave portion (31a)). The second frame (32) is fitted into the first recess (31a) of the first frame (31), and has hexagonal socket bolts (not shown) at counterbore portions (32c) formed at six locations in the circumferential direction. ) To the first frame (31). With such a configuration, the space surrounded by the second recess (31b) and the second frame (32) of the first frame (31) constitutes an accommodation space (S30).

An annular protrusion (32a) is provided on the inner peripheral edge of the second frame (32). A ring-shaped concave groove (32d) along the circumferential direction is provided on the projecting end surface of the annular convex portion (32a), and a seal ring (32b) is fitted into the concave groove (32d). The seal ring (32b) is in sliding contact with the back surface (lower surface in FIG. 2) of a movable side end plate (61), which will be described later, and seals the gap between the second frame (32) and the movable side end plate (61). With such a configuration, the seal ring (32b) allows the space facing the back of the movable side end plate (61) (that is, the space between the second frame (32) and the movable scroll (60)) to be radially inward. And outer two spaces (a space on the inner peripheral side of the seal ring (32b) and a space on the outer peripheral side of the seal ring (32b)).

"Seal ring"
A second seal ring (33) is provided between the first frame (31) and the second frame (32). The second seal ring (33) seals the gap in the axial direction between the first frame (31) and the second frame (32). A ring-shaped groove along the inner peripheral edge of the bottom surface of the first recess (31a) is provided on the bottom surface (annular bottom surface) of the first recess (31a) of the first frame (31). Two seal rings (33) are fitted.

<Fixed scroll>
As shown in FIG. 2, the fixed scroll (50) is arranged on one side (the upper side in FIG. 2) in the axial direction of the housing (30). The fixed scroll (50) has a fixed side end plate (51), a fixed side wrap (52), and an outer peripheral wall (53).

The fixed side end plate (51) is formed in a substantially circular plate shape. The fixed side wrap (52) is formed in a spiral wall shape that draws an involute curve, and stands on the front surface (lower surface in FIG. 2) of the fixed side end plate (51) and protrudes from the fixed side end plate (51). The outer peripheral wall portion (53) is formed so as to surround the outer peripheral side of the fixed side wrap (52), and protrudes downward from the front surface of the fixed side end plate (51). The distal end surface (the lower surface in FIG. 2) of the fixed side wrap (52) and the distal end surface of the outer peripheral wall portion (53) are substantially the same surface.

A suction port (not shown) is formed on the outer peripheral wall portion (53) of the fixed scroll (50). A downstream end of the suction pipe (11) is connected to the suction port. A discharge port (54) penetrating the fixed side end plate (51) is formed at the center of the fixed side end plate (51) of the fixed scroll (50). A relief valve (55) for opening and closing a relief port (not shown) is provided on the upper surface of the fixed side end plate (51).

<Moveable scroll>
As shown in FIGS. 2 and 5, the movable scroll (60) includes a movable side end plate (61), a movable side wrap (62), and a boss portion (63).

The movable side end plate (61) is formed in a substantially circular plate shape. The movable side wrap (62) is formed in the shape of a spiral wall that draws an involute curve, and stands on the front surface (upper surface in FIG. 2) of the movable side end plate (61) so as to protrude from the movable side end plate (61). The boss portion (63) is formed in a cylindrical shape, and is arranged at the center of the back surface (lower surface in FIG. 2) of the movable side end plate (61). The movable side wrap (62) of the movable scroll (60) is meshed with the fixed side wrap (52) of the fixed scroll (50).

A compression chamber (S20) is formed between the fixed scroll (50) and the movable scroll (60). The compression chamber (S20) is a space for compressing the fluid, compresses the fluid sucked from the suction pipe (11) through the suction port (not shown), and discharges the compressed fluid through the discharge port (54). Is configured to do.

<Communication passage>
As shown in FIGS. 1 to 3, the compression mechanism (20) is provided with a communication passageway (75). The communication passage (75) causes the fluid discharged into the first space (S1) to flow into the second space (S2) (that is, the space between the compression mechanism (20) and the electric motor (21) and below). It is a passage for. The communication passage (75) includes a scroll side passage (76) and a housing side passage (77). The scroll side passage (76) is configured by a groove extending in the axial direction from the upper end to the lower end of the outer peripheral wall portion (53) of the fixed scroll (50). The housing-side passage (77) is configured by a groove extending in the axial direction from the upper end to the lower end of the outer peripheral edge of the first frame (31).

<Oil return passage>
As shown in FIG. 2, the compression mechanism (20) is provided with an oil return passageway (80). The oil return passage (80) is a passage for discharging the lubricating oil of the compression mechanism (20) to the second space (S2) and returning it to the oil reservoir (13). The oil return passage (80) includes a connection passage (81) and an oil return member (82). The connection passage (81) extends radially outward from the second recess (31b) of the first frame (31). The oil return member (82) is provided such that its inflow end is connected to the outflow end of the connection passage (81) and its outflow end faces downward, and the lubricating oil flowing into the connection passage (81) is second It is configured to flow into the space (S2).

<Oldham Ring>
As shown in FIGS. 2 and 6, the Oldham ring (70) has a ring-shaped main body (73) formed in a ring shape having a rectangular cross section. The thickness of the ring-shaped main body (73) of the Oldham ring (70) is constant over the entire circumference of the Oldham ring (70). The Oldham ring (70) is provided with two movable keys (71) and two fixed keys (72) integrally with the ring-shaped main body (73). FIG. 2 is a cross-sectional view in which the left side from the center is cut by a plane passing through the movable side key (71), and the right side from the center is cut by a plane passing through the fixed side key (72).

The Oldham ring (70) is provided with four protruding portions that protrude outward in the radial direction of the Oldham ring (70) in the circumferential direction at equal intervals (90 ° intervals). Two of the four protruding portions of the Oldham ring (70) facing each other are formed with two (a pair) of movable side keys (71) protruding in one axial direction, and the remaining two Two projecting portions are formed with two (a pair of) fixed-side keys (72) projecting to the other in the axial direction.

《Moveable key》
The movable key (71) protrudes toward the movable scroll (60) side (the upper side in FIG. 2) of the Oldham ring (70). Specifically, the movable side key (71) is a protrusion formed in a substantially rectangular parallelepiped shape, and is provided on a surface (upper surface in FIG. 2) facing the movable scroll (60) of the Oldham ring (70). . The two movable keys (71) face each other across the central axis of the Oldham ring (70). That is, one movable side key (71) is arranged on the opposite side of the other movable side key (71) across the central axis of the Oldham ring (70). The surface on which the movable side key (71) of the Oldham ring (70) is formed is a surface that is in sliding contact with the back surface (lower surface) of the movable side end plate (61) in FIG. 2, and is a flat surface.

《Fixed key》
The fixed key (72) protrudes to the second frame (32) side (lower side in FIG. 2) of the Oldham ring (70). Specifically, the fixed side key (72) is a protrusion formed in a substantially rectangular parallelepiped shape, and is provided on the surface (the lower surface in FIG. 2) facing the second frame (32) of the Oldham ring (70). Yes. The two fixed keys (72) face each other across the central axis of the Oldham ring (70). That is, one fixed side key (72) is arranged on the opposite side of the other fixed side key (72) across the central axis of the Oldham ring (70). The opposing direction of the two fixed-side keys (72) is a direction orthogonal to the opposing direction of the two movable-side keys (71). Further, the surface on which the fixed key (72) of the Oldham ring (70) is formed is a surface in sliding contact with the upper surface of the second frame (32) in FIG. 2, and is a flat surface.

<Moving side keyway>
As shown in FIGS. 2 and 5, the movable side end plate (61) of the movable scroll (60) has two (a pair) of movable sides on the surface (lower surface) facing the Oldham ring (70) in FIG. A keyway (64) is provided. Two movable side keys (71) of the Oldham ring (70) are slidably fitted in the two movable side key grooves (64). In addition, the surface where the movable side end plate (61) faces the Oldham ring (70) is a surface in sliding contact with the upper surface of the Oldham ring (70) in FIG. 2, and is a flat surface.

The movable side keyway (64) of the movable side end plate (61) extends radially from the movable side end plate (61) and opens to the outer periphery of the movable side end plate (61). The two movable side key grooves (64) of the movable side end plate (61) are opposed to each other across the central axis of the movable scroll (60). That is, one movable side keyway (64) is arranged on the opposite side of the other movable side keyway (64) across the central axis of the movable scroll (60).

<Fixed side keyway>
As shown in FIGS. 2 and 4, the second frame (32) has two (a pair of) fixed-side key grooves (35) on the surface (upper surface) facing the Oldham ring (70) in FIG. Is provided. Two fixed-side keys (72) of the Oldham ring (70) are slidably fitted in the two fixed-side key grooves (35), respectively. Note that the surface of the second frame (32) facing the Oldham ring (70) is a surface that is in sliding contact with the lower surface of the Oldham ring (70) in FIG. 2, and is a flat surface.

The fixed side keyway (35) of the second frame (32) extends in the radial direction of the second frame (32) and opens to the outer periphery of the second frame (32), and the radial direction of the fixed side keyway (35). The inner end is closed. The two fixed-side key grooves (35) of the second frame (32) sandwich the axis of the eccentric rotary motion of the movable scroll (60) at positions facing each other across the central axis of the second frame (32). Is arranged). The opposing direction of the two fixed-side key grooves (35) is a direction orthogonal to the opposing direction of the two movable-side key grooves (64).

<Oldham ring working space oil discharge structure>
The second frame (32) of the housing (30) has an Oldham ring support surface (36) for supporting the Oldham ring (70), and the Oldham ring support surface (36) is connected to the lower surface of the Oldham ring (70). It is comprised by the surface which touches.

The first frame (31) of the housing (30) has an outer peripheral wall (37) that is positioned on the outer periphery of the Oldham ring (70) and defines an annular space (45) between the Oldham ring (70). doing.

The second frame (32) of the housing (30) includes an annular space (45) and an oil discharge space (46) between the fixed scroll (50) and the Oldham ring support surface (36). A space communication part (40) that communicates is formed. The space communication portion (40) is connected to the first communication portion (41) extending in the circumferential direction from the outer peripheral end of the fixed keyway (35) of the housing (30), and the first communication portion (41). A second communicating portion (42) (axial hole (32c)) that communicates and opens on the Oldham ring support surface (36) is provided, and the oil in the annular space (45) is discharged to the oil draining space (46). Is configured to do.

As described above, the second frame (32) is formed with a counterbore (32c) for fixing the second frame (32) to the first frame with a hexagon socket bolt. The first communication part (41) is formed on the outer peripheral surface (44) of the second frame (32) so as to communicate with the counterbore parts (32c) formed on both sides of the fixed-side keyway (35). It is comprised by the circular-arc-shaped circumferential groove | channel (47) made. The second communication portion (42) is formed by counterbore portions (32c) adjacent to the fixed-side keyway (35) that opens upward from the second frame (32), that is, the fixed scroll (50) and the above-described It consists of counterbore portions (32c) on both sides of the fixed-side keyway (35) that open to the oil drain space (46) between the Oldham ring support surface (36). The first communication part (41) has a first end part (41a) communicating with an outer peripheral side end part (opening side end part) of the fixed side keyway (35), and a second end part (41b) being a second end part. It communicates with the oil drainage space (46) via the communication part (42).

The first communication portion (41) formed by the circumferential groove (47) includes an inner peripheral surface (43) of the outer peripheral wall (37) of the first frame (31) and an outer peripheral surface of the second frame (32). (44) is formed in the part where it fits.

[Operation of scroll compressor]
Next, the operation of the scroll compressor (1) will be described.

When the electric motor (21) is operated, the movable scroll (60) of the compression mechanism (20) is rotationally driven by the drive shaft (22). The orbiting scroll (60) is controlled to rotate by the Oldham ring (70) and swivels around the axis of the main shaft (22a) of the drive shaft (22) as the radius of the eccentric shaft (22b). Revolve on orbit. When the movable scroll (60) undergoes revolving (eccentric rotational movement), fluid (for example, low-pressure gas refrigerant) enters the compression chamber (S20) from the suction pipe (11) through the suction port (not shown) of the compression mechanism (20). Inhaled and compressed. The fluid (for example, high-pressure gas refrigerant) compressed in the compression chamber (S20) is discharged to the first space (S1) through the discharge port (54) of the fixed scroll (50). The high-pressure fluid discharged into the first space (S1) flows into the second space (S2) through the communication path (75) provided in the fixed scroll (50) and the housing (30). The high-pressure fluid that has flowed into the second space (S2) is discharged outside the casing (10) through the discharge pipe (12).

[Lubricant oil flow during operation]
Next, the flow of lubricating oil in the operation of the scroll compressor (1) will be described.

When the electric motor (21) is operated and the drive shaft (22) rotates, the lubricating oil in the oil reservoir (13) is supplied to the oil supply passage (22d) by the capacity pump action (the action of pumping up the lubricating oil) of the suction nozzle (22e). And is supplied to a sliding contact portion where the drive shaft (22) and the compression mechanism (20) and the bearing member (14) slide. Specifically, the lubricating oil flowing through the oil supply passage (22d) passes between the drive shaft (22) and the bearing member (14) through a branch passage (not shown) extending radially from the oil supply passage (22d). The sliding contact portion, the sliding contact portion between the main shaft portion (22a) of the drive shaft (22) and the bulging portion (31c) (bearing metal (31d)) of the first frame (31), and the drive shaft (22 ) Is provided to a plurality of sliding portions such as a sliding contact portion between the eccentric shaft portion (22b) and the boss portion (63) of the movable scroll (60). The lubricating oil flowing out from the upper end of the oil supply passage (22d) passes through another oil supply passage (not shown) and the outer peripheral wall (53) of the fixed scroll (50) and the movable end plate (61) of the movable scroll (60). ).

The lubricating oil supplied to the sliding portion between the boss portion (63) of the movable scroll (60) and the eccentric shaft portion (22b) of the drive shaft (22) is the inner circumferential space of the second frame (32) ( It flows into and is stored in an oil sump space constituted by a space on the inner peripheral side of the seal ring (32b) and a storage space (S30). The lubricating oil stored in the oil sump space flows into the second space (S2) through the oil return passage (80) and passes through the core cutout (13a) provided in the stator (21a) of the electric motor (21). Return to).

Part of the lubricating oil stored in the oil sump space is a portion where the movable scroll (60) and the Oldham ring (70) are in sliding contact (in FIG. 2, the lower surface of the movable side end plate (61) and the Oldham ring (70). Between the second frame (32) and the Oldham ring (70) (in FIG. 2, between the lower surface of the Oldham ring (70) and the upper surface of the second frame (32)). Supplied. For example, a part of the lubricating oil collected in the oil sump space is slidably contacted between the movable scroll (60) and the Oldham ring (70) through the movable key groove (64) and the fixed key groove (35). And supplied to the sliding contact portion between the second frame (32) and the Oldham ring (70). The lubricating oil used for lubricating the sliding contact portion between the movable scroll (60) and the Oldham ring (70) and the sliding contact portion between the second frame (32) and the Oldham ring (70) is: It flows into the outer space of the seal ring (32b). This lubricating oil accumulates in the annular space (45) on the outer periphery of the Oldham ring (70).

[Draining oil from the annular space]
Next, a flow in which oil accumulated in the annular space (45) is discharged will be described. First, the behavior of the movable scroll (60) and the Oldham ring (70) during the operation of the compression mechanism (20) will be described with reference to FIG. In FIG. 7, dots are added to the Oldham ring (70) to facilitate understanding of the behavior of the Oldham ring (70). In the example of FIG. 7, the movable scroll (60) revolves counterclockwise, and the rotation angle of the drive shaft (22) when the movable scroll (60) is located on the rightmost side in FIG. Is a reference angle (0 °).

When the drive shaft (22) rotates 90 ° counterclockwise from the reference angle, the Oldham ring (70) moves upward along the fixed keyway (35) with respect to the second frame (32) in FIG. The movable scroll (60) moves to the upper end of the range, and the movable scroll (60) moves leftward along the movable side keyway (64) with respect to the Oldham ring (70) to the center of the movable range (1/2 position of the movable range). To do. At this time, the movable scroll (60) is composed of two movements, the relative movement of the Oldham ring (70) with respect to the second frame (32) and the relative movement of the movable scroll (60) with respect to the Oldham ring (70). Thus, it revolves 90 ° counterclockwise without rotating (90 ° position in FIG. 7).

When the drive shaft (22) is further rotated 90 ° counterclockwise, the Oldham ring (70) in FIG. 7 moves from the upper end to the center of the movable range, and the movable scroll (60) moves from the center of the movable range to the left end. Moving. At this time, the movable scroll (60) is revolved by 90 ° in the counterclockwise direction without rotating, by combining two operations (position of 180 ° in FIG. 7).

When the drive shaft (22) further rotates 90 ° counterclockwise, the Oldham ring (70) moves from the center of the movable range to the lower end in FIG. 7, and the movable scroll (60) moves from the left end to the center of the movable range. Moving. At this time, the movable scroll (60) is revolved by 90 ° in the counterclockwise direction without rotating, by combining two actions (position of 270 ° in FIG. 7).

When the drive shaft (22) is further rotated 90 ° counterclockwise, the Oldham ring (70) in FIG. 7 moves from the lower end to the center of the movable range, and the movable scroll (60) moves from the center to the right end of the movable range. Moving. At this time, the movable scroll (60) combines two operations and rotates 90 ° further counterclockwise without rotating (position of 0 ° in FIG. 7).

As described above, when the drive shaft (22) rotates and the movable scroll (60) revolves, the Oldham ring (70) moves along the fixed keyway (35) in FIG. Repeatedly reciprocating between the bottom and bottom. When the Oldham ring (70) moves to the upper end of the movable range in FIG. 7, the annular space (45) formed around the Oldham ring (70) becomes smaller in the upper part of the Oldham ring (70). Go. In particular, in the upper fixed-side key groove (35) in FIG. 7, the internal volume is reduced by the fixed-side key (72) that moves upward in the drawing, so that the lubrication accumulated in the annular space (45) is reduced. The oil is subjected to such a force that it is compressed in the fixed side keyway (35).

On the other hand, in this embodiment, since the space communication portion (40) communicating with the fixed-side keyway (35) is formed in the second frame (32), the lubricating oil that has received the force to be compressed is The oil-removing space (45) and the fixed-side keyway (35) through the first communication part (41) and the second communication part (42) (the counterbore part (32c)) are drained ( Go to 46). For this reason, it is suppressed that the lubricating oil in the annular space (45) or the fixed-side keyway (35) becomes a resistance of the operation of the Oldham ring (70).

This is the same when the Oldham ring (70) moves to the lower end of the movable range in FIG. 7, and the annular space (45) formed around the Oldham ring (70) is the Oldham ring (70). ), The lubricating oil is removed from the annular space (45) and the fixed-side keyway (35) even if the volume inside the fixed-side keyway (35) on the lower side of Figure 7 is reduced. The oil passes through the first communication part (41) and the second communication part (42) (spot face part (32c)) to the oil drainage space (46). Therefore, it is suppressed that the lubricating oil in the annular space (45) or the fixed-side keyway (35) becomes a resistance of the operation of the Oldham ring (70).

-Effect of Embodiment 1-
As described above, in the scroll compressor according to the first embodiment, the housing (30) has an Oldham ring support surface (36) for supporting the Oldham ring (70) and an outer periphery of the Oldham ring (70). An outer peripheral wall (37) that is positioned and defines an annular space (45) between the Oldham ring (70) and a fixed key (72) of the Oldham ring (70) that is slidably fitted. The side keyway (35) and the first end (41a) communicate with the outer peripheral side end of the fixed side keyway (35), and the second end (41b) is connected to the fixed scroll (50) and the Oldham. And a space communication portion (40) communicating with the oil drain space (46) between the ring support surface (36).

In Embodiment 1, the Oldham ring (70) moves along the fixed-side keyway (35) during the eccentric rotation of the movable scroll (60), so that the annular space ( When 45) becomes smaller, the lubricating oil in the annular space (45) and the fixed-side keyway (35) communicates with the first end (41a) at the outer peripheral end of the fixed-side keyway (35). Then, the second end (42b) passes through the space communication portion (40) communicating with the oil drain space (46) and is discharged to the oil drain space (46). Thus, according to the present embodiment, when the compression mechanism (20) operates, the lubricating oil in the fixed-side keyway (35) is discharged to the oil discharge space (46). The action of the force to be compressed is suppressed. Accordingly, since the lubricating oil is less likely to resist resistance to the reciprocating motion of the Oldham ring (70) while the compression mechanism (20) is in operation, it is possible to suppress a reduction in the efficiency of the compressor.

In the first embodiment, the space communication portion (40) includes a first communication portion (41) extending in a circumferential direction from an outer peripheral side end portion of the fixed-side keyway (35) of the housing (30), and A second communication portion (42) communicating with the first communication portion (41) and opening in the Oldham ring support surface (36). Then, as the second communication part (42), a counterbore part (axial hole) (32c) for attaching a hexagon socket head bolt for fixing the second frame (32) to the first frame (31) is used. Yes.

Therefore, a simple configuration in which the first communication portion (41) and the second communication portion (42) are formed in the housing (30) can suppress the reduction in the configuration of the compressor, and the second communication portion (42) has a counterbore portion. By using (32c), it is possible to obtain an effect of simplifying the configuration.

In Embodiment 1, the housing (30) is fitted to the first frame (31) having the outer peripheral wall (37) and the outer peripheral surface fitting the inner peripheral surface (43) of the outer peripheral wall (37). (44) and the second frame (32) having the Oldham ring support surface (36), and the first communication portion (41) is formed on the outer peripheral surface (44 of the second frame (32)). ) Including a circumferential groove (47).

As described above, in the first embodiment, the housing (30) is divided into two members, and the first communication portion (41) is formed using the circumferential groove (47) formed on the outer peripheral surface of the second frame (32). Therefore, the configuration that suppresses the Oldham ring (70) from becoming the resistance of the lubricating oil during the eccentric rotation of the movable scroll (60) can be easily put into practical use.

<< Embodiment 2 >>
Embodiment 2 shown in FIG. 8 will be described.

The second embodiment is configured such that the configuration of the space communication part (40) is different from that of the first embodiment.

In the space communication portion (40) of the second embodiment, the first communication portion (41) is configured by an arcuate circumferential groove (47) that communicates from one of the pair of fixed side key grooves (35) to the other. Yes. The circumferential groove (47) of the second embodiment has a circumferential length formed between the stationary key groove (35) and the counterbore part (32c) adjacent to the circumferential groove (47) of the first embodiment. In contrast to the short groove, it is a groove having a long circumferential length communicating from one side of the fixed side key groove (35) to the other.

In the first embodiment, the second communication portion (42) is constituted by a counterbore (32c) adjacent to the fixed-side keyway (35), whereas in this second embodiment, the pair of fixed-side keys In the configuration in which the arc-shaped circumferential groove (47) communicating from one of the grooves (35) to the other is provided as the first communication portion (41), the other of the fixed side key grooves (35) is used. That is, when the lubricating oil in the fixed side key groove (35) located on the upper side in FIG. 8 is discharged, the lower side fixed side key groove (35) in FIG. In FIG. 8, when the lubricating oil in the fixed side keyway (35) located on the lower side is discharged, the upper side fixed keyway (35) in the same figure becomes the second communicating portion.

Other configurations are the same as those in the first embodiment, and a detailed description thereof will be omitted.

Also in the second embodiment, when the drive shaft (22) rotates and the movable scroll (60) revolves, the Oldham ring (70) is inserted into the fixed-side keyway (35) in FIG. The operation of reciprocating between the upper end and the lower end of the movable range along is repeated. When the Oldham ring (70) moves to the upper end of the movable range in FIG. 7, the annular space (45) formed around the Oldham ring (70) becomes smaller in the upper part of the Oldham ring (70). Go. In particular, in the upper fixed-side key groove (35) in FIG. 7, the internal volume is reduced by the fixed-side key (72) that moves upward in the figure, so that the lubrication accumulated in the annular space (45) The oil is subjected to such a force that it is compressed in the fixed side keyway (35).

In the second embodiment, the space communication portion (40) communicating with the fixed side keyway (35) is formed in the second frame (32), and the force with which the lubricating oil is compressed in the upper side fixed keyway (35). Since the lower fixed-side keyway (35) serves as the second communication part when receiving the lubricant, the lubricating oil flows from the annular space (45) or the fixed-side keyway (35) with a reduced volume. The oil passes through the first communication portion (41) and the second communication portion (42) (the lower fixed side keyway (35)) to the oil drainage space (46). For this reason, it is suppressed that the lubricating oil in the annular space (45) or the upper fixed side keyway (35) becomes a resistance of the operation of the Oldham ring (70).

This is the same when the Oldham ring (70) moves to the lower end of the movable range in FIG. 7, and the annular space (45) formed around the Oldham ring (70) is the Oldham ring (70). ) In the lower part of Fig. 7 and the inner volume of the lower fixed-side keyway (35) in Fig. 7 is reduced, the lubricating oil remains in the annular space (45) and the lower fixed-side keyway ( 35) passes through the first communication portion (41) and the second communication portion (42) (upper fixed side keyway (35)) to the oil drainage space (46). Therefore, the lubricating oil in the annular space (45) and the lower fixed-side keyway (35) is suppressed from becoming a resistance to the operation of the Oldham ring (70).

-Effect of Embodiment 2-
In the second embodiment, the Oldham ring (70) moves along the fixed-side keyway (35) when the movable scroll (60) rotates eccentrically, so that the annular space (45) as described in FIG. Is smaller, the lubricating oil in the annular space (45) and the fixed-side key groove (35) passes from one of the fixed-side key grooves (35) to the circumferential groove (47) as the first communication portion (41). ) And the other of the fixed side keyway (35) which is the second communication part (42), and is discharged to the oil drainage space (46). As described above, also in the second embodiment, when the compression mechanism (20) operates, the lubricating oil in the fixed-side keyway (35) is discharged to the oil discharge space (46). The applied force is suppressed from acting. Therefore, even when the configuration of the second embodiment is adopted, since the lubricating oil becomes less resistant to the reciprocating motion of the Oldham ring (70) during the operation of the compression mechanism (20), the efficiency of the compressor is reduced. It becomes possible to suppress.

In the second embodiment, the first communication part (41) is constituted by a passage communicating from one of the pair of fixed side key grooves (35) to the other, and the second communication part (42) The other of the pair of fixed side key grooves (35) is configured. Thus, in Embodiment 2, since the other of the pair of fixed-side key grooves (35) is used for the second communication portion (42), a high effect can be obtained in that the configuration can be simplified. Become.

<< Embodiment 3 >>
A third embodiment shown in FIG. 9 will be described. FIG. 9 is a plan view showing configurations of the first frame (31) and the second frame (32) of the scroll compressor according to the third embodiment.

In the third embodiment, the second frame (32) has a convex portion (38) in which a portion including the fixed-side keyway (35) formed in the second frame (32) projects radially outward. Is formed. The first frame (31) has a recess (39) that receives the protrusion (38).

A first circumferential groove (47a) constituting the first communication portion (41) is formed on the outer peripheral surface of the convex portion (38). In the second frame (32), second circumferential grooves (47b) are formed on both the left and right sides when the convex portion (38) is viewed from above. The first circumferential groove (47a) and the second circumferential groove (47b) pass through the fixed-side key groove (35) in the second frame (32), similarly to the circumferential groove (47) in FIG. 4B ( (Crossing) is formed at a height.

The convex part (38) and the concave part (39) are respectively formed at two positions where the fixed side keyway (35) is formed. The circumferential length of the convex portion (38) is shorter than the circumferential length of the concave portion (39), and a gap (48) is formed between the fitted convex portion (38) and the concave portion (39). Has been. The space | gap (48) is formed in the both right and left sides of the circumferential direction of each convex part (38).

In the third embodiment, similarly to the first embodiment, counterbore portions (32c) that are axial holes formed on both sides of the fixed-side key groove (35) and opened to the Oldham ring support surface (36) are provided. The 2nd communication part (42) is comprised. The second circumferential groove (47b), which is a part of the first communication part (41), communicates with the second communication from the fixed key groove (35) through the first circumferential groove (47a) and the gap (48). The part (42) is formed so as to extend in the circumferential direction of the housing (30).

In Embodiment 3, the upper end of the gap (48) communicates with the oil drainage space (46). Therefore, the space | gap (48) comprises not only a part of 1st communication part (41) but also a part of 2nd communication part (42).

In addition, as long as the 1st circumferential direction groove | channel (47a) and the 2nd circumferential direction groove | channel (47b) communicate, the circumferential direction length of each said convex part (38) and recessed part (39) may be changed suitably. . In other words, the first circumferential groove (47a) and the second circumferential groove (47b) need only communicate with each other even if the circumferential width of each gap (48) is small. For example, the first circumferential groove (47a) And the second circumferential groove (47b) may be directly communicated with each other so that the gap (48) does not substantially exist. In this case, the gap (48) does not constitute a part of the second communication portion (42).

Also in the third embodiment, the first communication portion (41) and the second communication portion (42) are formed in the housing (30) including the first frame (31) and the second frame (32). When the compression mechanism (20) operates, the lubricating oil in the annular space (45) and the fixed-side keyway (35) is communicated with the first communication portion (41), which is the space communication portion (40), and the second communication. The oil is discharged to the oil drainage space (46) through the section (42). Accordingly, it is possible to easily realize a configuration in which the lubricating oil becomes less resistant to the reciprocating motion of the Oldham ring (70) during the operation of the compression mechanism (20), and the reduction in efficiency of the compressor can be suppressed. .

-Modification of Embodiment 3-
<Modification 1>
FIG. 10 is a plan view illustrating configurations of the first frame (31) and the second frame (32) of the scroll compressor according to the first modification of the third embodiment.

In the first modification, the basic shapes of the first frame (31) and the second frame (32) are the same as those of the third embodiment in FIG. On the other hand, the 1st communication part (41) is comprised by the channel | path connected from one side of a pair of fixed side keyway (35) to the other similarly to Embodiment 2 of FIG. Specifically, the first communication portion (41) includes a first circumferential groove (47a), a second circumferential groove (47b), which are continuously disposed between the opposed fixed-side key grooves (35), A third circumferential groove (47c) and a second circumferential groove (47b) are provided.

The second communication groove (42) is composed of each counterbore (32c) and each gap (48). Therefore, the flow passage cross-sectional area of the second communication groove (42) of Modification 1 is larger than the flow passage cross-sectional area of the second communication groove (42) in FIG.

Other configurations are the same as those of the third embodiment shown in FIG.

Also in the first modification, the first communication portion (41) and the second communication portion (42) are formed in the housing (30) including the first frame (31) and the second frame (32). When the compression mechanism (20) operates, the lubricating oil in the annular space (45) and the fixed-side keyway (35) is communicated with the first communication portion (41), which is the space communication portion (40), and the second communication. The oil is discharged to the oil drainage space (46) through the section (42). Accordingly, it is possible to easily realize a configuration in which the lubricating oil becomes less resistant to the reciprocating motion of the Oldham ring (70) during the operation of the compression mechanism (20), and the reduction in efficiency of the compressor can be suppressed. . Further, since the flow passage cross-sectional area of the second communication groove (42) is larger than that of the third embodiment of FIG. 9, the lubricating oil is easily discharged into the oil discharge space (46).

<Modification 2>
FIG. 11 is a plan view illustrating the configuration of the first frame and the second frame of the scroll compressor according to the second modification of the third embodiment.

This modification 2 is an example in which the first communication portion (41) is formed across both the first frame (31) and the second frame (32). Specifically, the first communication portion (41) includes a first circumferential groove (47a) formed on the convex portion (38) of the second frame (32), as in the first modification of FIG. Unlike the modified example 1, the fourth circumferential groove (47d) is formed on the inner peripheral surface of the outer peripheral wall (37) of the first frame (31).

Also in this modified example 2, the first communication part (41) and the second communication part (42) are formed in the housing (30) composed of the first frame (31) and the second frame (32). When the compression mechanism (20) operates, the lubricating oil in the annular space (45) and the fixed-side keyway (35) is communicated with the first communication portion (41), which is the space communication portion (40), and the second communication. The oil is discharged to the oil drainage space (46) through the section (42). Accordingly, it is possible to easily realize a configuration in which the lubricating oil becomes less resistant to the reciprocating motion of the Oldham ring (70) during the operation of the compression mechanism (20), and the reduction in efficiency of the compressor can be suppressed. . Further, since the flow passage cross-sectional area of the second communication groove (42) is larger than that of the third embodiment of FIG. 9, the lubricating oil is easily discharged into the oil discharge space (46).

<Modification 3>
FIG. 12 is a plan view showing configurations of the first frame and the second frame of the scroll compressor according to the third modification of the third embodiment.

The third modification is an example in which the second circumferential groove (47b) is not formed and the first communication portion (41) is configured only by the first circumferential groove (47a) in the third embodiment of FIG. . In this configuration, the second communication portion (42) is constituted by the gap (48).

Also in this modified example 3, the first communication part (41) and the second communication part (42) are formed in the housing (30) composed of the first frame (31) and the second frame (32). When the compression mechanism (20) operates, the lubricating oil in the annular space (45) and the fixed-side keyway (35) is communicated with the first communication portion (41), which is the space communication portion (40), and the second communication. The oil is discharged to the oil drainage space (46) through the section (42). Accordingly, it is possible to easily realize a configuration in which the lubricating oil becomes less resistant to the reciprocating motion of the Oldham ring (70) during the operation of the compression mechanism (20), and the reduction in efficiency of the compressor can be suppressed. .

<< Embodiment 4 >>
The fourth embodiment shown in FIG. 13 will be described. FIG. 13 is a cross-sectional view illustrating a main part of the scroll compressor according to the fourth embodiment.

In the fourth embodiment, the first communication portion (41) composed of the circumferential groove (47) and the second communication portion (42) composed of the spot facing portion (32c) are not used as the space communication portion (40), but instead. In addition, on the inner surface of the outer peripheral wall (37) of the first frame (31), the outer peripheral end of the fixed-side key groove (35) formed in the second frame (32) and the oil discharge space (46) are A third communication portion (49) that communicates along the axial direction of one frame (31) is formed, and this third communication portion (49) is used as the space communication portion (40).

The outer peripheral wall (37) of the first frame (31) has a thick part (37a) and a thin part (37b). The thick part (37a) is formed in the lower part of the outer peripheral wall (37) in the figure, and the thin part (37b) is formed above the thick part (37a). The thick part (37a) is formed outside the first recess (31a) having an inner diameter with which the second frame (32) is fitted. The thin-walled portion (37b) is a circular recess formed with an inner diameter larger than the inner diameter of the first recess (31a), or only the pair of fixed-side key grooves (35) is the outer peripheral surface of the second frame (32). And a vertical groove having a shape separating the space.

As described above, the thick part (37a) is fitted to the outer peripheral surface of the second frame (32). On the other hand, a space is formed between the thin portion (37b) and the second frame (32) by the circular recess or vertical groove, and this space constitutes the third communication portion (49). ing.

In Embodiment 4, the lower end of the third communication portion (49) is higher than the bottom surface of the fixed-side key groove (35) and lower than the upper end (Oldham ring support surface (36)) of the fixed-side key groove (35). Is set to The lower end of the third communication portion (49) communicates with the fixed-side keyway (35) at the same height as the Oldham ring support surface (36) or lower than that, and the thick portion (37a) ) May be formed.

Other configurations are the same as those in each of the above embodiments, and a detailed description thereof will be omitted.

Also in the fourth embodiment, since the third communication portion (49) is formed in the housing (30) including the first frame (31) and the second frame (32), the compression mechanism (20) operates. In addition, the lubricating oil in the annular space (45) and the fixed-side keyway (35) is discharged to the oil discharge space (46) through the third communication portion (49) which is the space communication portion (40). . Accordingly, it is possible to easily realize a configuration in which the lubricating oil becomes less resistant to the reciprocating motion of the Oldham ring (70) during the operation of the compression mechanism (20), and the reduction in efficiency of the compressor can be suppressed. . In addition, the shapes of the first frame (31) and the second frame (32) can be simplified, and the first frame (31) and the second frame (32) can easily form an integral housing (30). .

-Modification of Embodiment 4-
In Embodiment 4 of FIG. 13, the circumferential groove (47) as the first communication portion (41) and the axial hole (32c) as the second communication portion (42) are not used as the space communication portion (40). In this example, only the third communication part (49) is used as the space communication part (40), but the first communication part (41), the second communication part (42) and the third communication part (49) are used in combination. Also good.

<< Other Embodiments >>
About the said embodiment, it is good also as the following structures.

For example, in each of the first to third embodiments, the first communication portion (41) is basically formed on the outer peripheral surface (44) of the second frame (32), but the first communication portion (41) 11 may be formed on the inner peripheral surface (43) of the outer peripheral wall (37) of the first frame (31) as in the second modification of the third embodiment shown in FIG.

In the above-described embodiment, the housing (30) is divided into the first frame (31) and the second frame (32), and the space communication portion that allows the lubricating oil to escape from the annular space (45) to the oil discharge space (46). (40) is configured using a first communication portion (41) formed in a portion where the inner peripheral surface (43) of the first frame (31) and the outer peripheral surface (44) of the second frame (32) are fitted. However, the space communication part (40) is configured to drain oil from the annular space (45) and the fixed-side keyway (35) where the lubricating oil is compressed into the oil drainage space (46). However, the configuration is not limited to the above-described embodiments, and may be changed as appropriate. For example, if the lubricating oil is configured to be discharged from the annular space (45) or the fixed-side keyway (35) to the oil discharge space (46), as described in the fourth embodiment, the housing (30 ) May have a structure in which the first frame (31) and the second frame (32) are integrated.

The embodiment and the modification have been described above, but various changes in form and details are possible without departing from the spirit and scope of the claims. In addition, the above embodiments and modifications may be appropriately combined or replaced as long as the functions of the subject of the present disclosure are not impaired.

As described above, the present disclosure is useful for a scroll compressor.

1 Scroll compressor 10 Casing 30 Housing 31 1st frame 32 2nd frame 32c Axial hole 35 Fixed side keyway 36 Oldham ring support surface 37a Thick part 37b Thin part 37 Outer wall 38 Convex part 39 Concave part 40 Spatial communication part 41 First communication portion 41a First end portion 41b Second end portion 42 Second communication portion 43 Inner peripheral surface 44 Outer peripheral surface 45 Annular space 46 Oil draining space 47 Circumferential groove 48 Air gap 49 Third communication portion 50 Fixed scroll 60 Movable scroll 70 Oldham ring 72 Fixed key

Claims

A scroll compressor,
A casing (10);
A housing (30) provided in the casing (10);
A fixed scroll (50) fixed to the housing (30);
A movable scroll (60) disposed between the housing (30) and the fixed scroll (50), meshed with the fixed scroll (50) and performing eccentric rotational movement with respect to the fixed scroll (50);
An Oldham ring (70) disposed between the housing (30) and the movable scroll (60) and restricting the rotation of the movable scroll (60),
The housing (30) has an annular space between the Oldham ring support surface (36) supporting the Oldham ring (70) and the Oldham ring (70) and the Oldham ring (70). 45), an outer peripheral wall (37), a fixed-side key groove (35) in which the fixed-side key (72) of the Oldham ring (70) is slidably fitted, and a first end (41a) An oil drainage space (46) between the fixed scroll (50) and the Oldham ring support surface (36) is communicated with the outer peripheral end of the fixed keyway (35) and the second end (41b) is between the fixed scroll (50) and the Oldham ring support surface (36). And a space communication section (40) communicating with the scroll compressor.
In claim 1,
The space communication part (40) is connected to the first communication part (41) extending in the circumferential direction from the outer peripheral end of the fixed keyway (35) of the housing (30), and the first communication part (41). A scroll compressor comprising a second communication portion (42) communicating and opening to the Oldham ring support surface (36).
In claim 2,
The housing (30) includes a first frame (31) having the outer peripheral wall (37), an outer peripheral surface (44) fitted to an inner peripheral surface (43) of the outer peripheral wall (37), and the Oldham ring support. A second frame (32) having a surface (36),
The first communication part (41) includes a circumferential groove (47) formed in the inner peripheral surface (43) of the first frame (31) or the outer peripheral surface (44) of the second frame (32). A scroll compressor characterized by that.
In claim 3,
The second frame (32) is formed with a convex portion (38) in which a portion including the fixed-side keyway (35) formed in the second frame (32) protrudes radially outward. One frame (31) is formed with a recess (39) for receiving the protrusion (38),
The scroll compressor, wherein the circumferential groove (47) is formed on the outer peripheral surface of the convex portion (38).
In claim 4,
A gap (48) is formed between the convex portion (38) and the concave portion (39),
The scroll compressor, wherein the second communication portion (42) includes the gap (48).
In any one of claims 3 to 5,
The scroll compressor, wherein the first communication part (41) is formed in the second frame (32).
In any one of claims 3 to 5,
The scroll compressor, wherein the first communication part (41) is formed in the first frame (31).
In any one of claims 2 to 7,
The second communication portion (42) is formed by an axial hole (32c) formed on both sides of the fixed-side keyway (35) and opening in the Oldham ring support surface (36).
The scroll compressor, wherein the first communication part (41) is formed in the circumferential direction of the housing (30) from the fixed-side keyway (35) to the axial hole (32c).
In any one of claims 2 to 7,
The fixed-side keyway (35) is a pair of keyways arranged on the housing (30) with the axis of the eccentric rotational motion of the movable scroll (60) interposed therebetween,
The first communication part (41) is configured by a passage communicating from one of the pair of key grooves to the other,
The scroll compressor, wherein the second communication portion (42) is constituted by the other of the pair of key grooves.
In claim 1,
The housing (30) includes a first frame (31) having the outer peripheral wall (37), an outer peripheral surface (44) fitted to an inner peripheral surface (43) of the outer peripheral wall (37), and the Oldham ring support. A second frame (32) having a surface (36),
On the inner surface of the outer peripheral wall (37) of the first frame (31), the outer peripheral end of the fixed side keyway (35) formed in the second frame (32) and the oil drainage space (46), A scroll compressor characterized in that a third communication part (49) communicating in the axial direction of the first frame (31) is formed as the space communication part (40).
In claim 10,
The outer peripheral wall (37) of the first frame (31) has a thick part (37a) and a thin part (37b) located above the thick part (37a),
While the thick part (38a) is fitted to the outer peripheral surface of the second frame (32), the third communication part (49) is provided between the thin part (37b) and the second frame (32). A scroll compressor characterized in that is formed.