JP2019100254A - Scroll compressor - Google Patents

Abstract

To provide a scroll compressor in which oil supply failure hardly occurs in a slide part between a key part of an Oldham ring and a key groove part.SOLUTION: A scroll compressor includes: an Oldham ring 40 having a key part 42; a member 32 having a key groove part 36 in which the key part is fitted to slide; and a crank shaft. By the rotation of the crank shaft, the volume in a compression chamber is changed and a refrigerant is compressed. The key part includes a side surface and an upper surface 42c orthogonal to each other. The key groove part has a side surface and a bottom surface 36c orthogonal to each other. The side surface of the key part opposes to the side surface of the key groove part in the rotation direction of the crank shaft. The upper surface of the key part opposes to the bottom surface of the key groove part. The upper surface of the key part has a first portion 42ca opposing to the bottom surface of the key groove part while the operation is stopped. The bottom surface of the key groove part has a second portion 36ca opposing to the first portion at the upper surface of the key part while the operation is stopped. At the second portion, a recess part 37 which is recessed to the opposite side from the opposing surface is formed.SELECTED DRAWING: Figure 6

Description

  The present disclosure relates to the lubrication of scroll compressors, in particular the Oldham rings of scroll compressors.

  Conventionally, a scroll compressor is known which rotates a movable scroll to rotate relative to a fixed scroll by rotating a crankshaft, and changes the volume of a compression chamber formed by the fixed scroll and the movable scroll to compress refrigerant. . In such a scroll compressor, in order to prevent rotation of the movable scroll, an Oldham ring as in Patent Document 1 (Japanese Unexamined Patent Publication No. 2010-031677) is often used.

  In the scroll compressor, liquid refrigerant condensed in the scroll compressor may be present when the scroll compressor is stopped. If the liquid refrigerant flows in the scroll compressor at the time of operation stop, the oil in the sliding part between the key part of the Oldham ring and the key groove into which the key part is inserted flows by the liquid refrigerant, and the oiling failure at the next start There is a possibility that abnormal wear may be caused by the sliding portion between the key portion and the key groove portion.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 2010-031677) does not disclose a technique for alleviating such a problem.

  An object of the present disclosure is a scroll compressor including an Oldham ring and a member having a key groove portion in which a key portion of the Oldham ring is fitted and slides, and in the sliding portion between the key portion and the key groove portion It is an object of the present invention to provide a scroll compressor which is less likely to cause defects.

  The scroll compressor includes an Oldham ring having a key portion, a member having a key groove portion on which a key portion of the Oldham ring is fitted and slides, and a crankshaft. The scroll compressor changes the volume of the compression chamber by the rotation of the crankshaft to compress the refrigerant. The key portion has a first surface and a second surface orthogonal to each other. The key groove has third and fourth surfaces orthogonal to each other. The first surface of the key portion faces the third surface of the key groove portion in the rotational direction of the crankshaft. The second surface of the key portion faces the fourth surface of the key groove portion. The second surface of the key portion has a first portion that faces the fourth surface of the key groove portion when the operation is stopped. The fourth surface of the key groove has a second portion that faces the first portion of the second surface of the key portion when the operation is stopped. At least one of the first portion and the second portion is formed with a recess that is recessed on the opposite side to the opposite surface.

  In the scroll compressor, the oil is held in the recess when the operation is stopped, so the oil between the first surface and the third surface, which is the sliding surface, disappears during the operation stop due to the flow of the liquid refrigerant or the like. Also, oil can be supplied between the first surface and the third surface from the recess at the start of operation. Therefore, it is difficult to cause a refueling failure in the sliding portion between the key portion and the key groove portion at the start of operation.

  Preferably, in the scroll compressor, the member includes at least one of a movable scroll and a fixed scroll. The movable scroll is driven by the rotation of the crankshaft, and rotation is prevented by the Oldham ring. The fixed scroll forms a compression chamber with the movable scroll.

  Here, it is possible to suppress the occurrence of the fueling failure between the key groove portion formed in the movable scroll and / or the fixed scroll and the key portion of the Oldham ring.

  Preferably, in the scroll compressor, the second surface of the key portion is an upper surface of the key portion, and the fourth surface of the key groove portion is a downward surface.

  Here, even if the liquid refrigerant flows around the key portion during the operation stop, the oil in the concave portion is caused by the liquid refrigerant as compared with the case where the concave portion is formed on the first surface of the key portion and the third surface of the key groove portion. It is hard to be washed away. Further, at the start of operation, the oil in the recess is likely to be supplied between the first and third surfaces by gravity.

  Preferably, in the scroll compressor, at least one of the first portion and the second portion in which the recess is formed has an oil retaining surface around the recess to suppress the outflow of oil from the recess at the time of shutdown.

  Here, the outflow of oil in the recess is likely to be suppressed when the operation is stopped.

  Preferably, in the scroll compressor, at the time of operation stop, the oil holding surface is a surface having a gap dimension of 100 μm or less with the surface to which the oil holding surface faces.

  Here, when the operation is stopped, the outflow of oil from the recess is easily suppressed.

  Preferably, in the scroll compressor, the region in which the recess is formed includes a constantly facing region facing the second surface of the key portion or the fourth surface of the key groove regardless of operation stop and operation.

  Here, even if the liquid refrigerant flows around the key portion during the stop of operation, the occurrence of the situation where the oil in the concave portion disappears is easily suppressed.

  Preferably, in the scroll compressor, the area where the recess is formed always includes only the facing area.

  Here, even if the liquid refrigerant flows around the key portion during the operation stop, the occurrence of the situation where the oil in the concave portion disappears is particularly easily suppressed.

1 is a schematic longitudinal sectional view of a scroll compressor according to an embodiment. It is a schematic plan view of the Oldham ring with which the scroll compressor of FIG. 1 is provided. It is a schematic side view of the Oldham ring of FIG. It is a schematic bottom view of the movable scroll of the scroll compressor of FIG. FIG. 5 is an enlarged schematic bottom view of a key groove portion of the movable scroll of FIG. 4; It is a schematic longitudinal cross-sectional view of the key groove part of the movable scroll of the scroll compressor of FIG. It is a schematic longitudinal cross-sectional view of the key groove part of the movable scroll of the scroll compressor concerning the modification A. FIG. It is a schematic plan view of the Oldham ring with which the scroll compressor concerning modification C is provided. It is a schematic side view of the Oldham ring of FIG. It is a schematic longitudinal cross-sectional view of a key groove part periphery of the fixed scroll of the scroll compressor which concerns on the modification E. As shown in FIG.

  Embodiments of a compressor will be described with reference to the drawings.

  In the following, expressions such as “upper” and “lower” may be used to explain the direction and arrangement, but unless otherwise noted, the direction of arrow U in the drawing is the upward direction.

  In addition, in the following description, expressions such as parallel, orthogonal, horizontal, vertical, and the like may be used, but these expressions are strictly related to parallel, orthogonal, horizontal, vertical, and the like. It does not mean only. The expressions such as parallel, orthogonal, horizontal, vertical, and the like include the cases of substantially parallel, orthogonal, horizontal, vertical, and the like.

(1) Overall Configuration A scroll compressor 10 according to an embodiment of the compressor will be described.

  As described later, the scroll compressor 10 according to the present embodiment changes the volume of the compression chamber Sc of the compression mechanism 30 by the rotation of the crankshaft 60, sucks the refrigerant from the suction pipe 23, and compresses the sucked refrigerant. And discharge the compressed refrigerant from the discharge pipe 24.

  The scroll compressor 10 is used, for example, in a vapor compression refrigeration system. In the present embodiment, the scroll compressor 10 is mounted on an outdoor unit of an air conditioner as an example of a refrigeration apparatus, and constitutes a part of a refrigerant circuit of the air conditioner. In the refrigerant circuit, the refrigerant compressed by the scroll compressor 10 dissipates heat by the radiator (condenser), is decompressed by the pressure reducing mechanism, absorbs heat by the evaporator, and is sucked again by the scroll compressor 10 Is done.

  The refrigerant to be compressed by the scroll compressor 10 is, for example, R32 of an HFC refrigerant. R32 is merely an example of the type of refrigerant, and the refrigerant to be compressed by the scroll compressor 10 may be a refrigerant other than R32.

  The scroll compressor 10 mainly includes a casing 20, a compression mechanism 30, a motor 50, a crankshaft 60, and a lower bearing 70 (see FIG. 1). The compression mechanism 30 includes a fixed scroll 31, a movable scroll 32, a housing 33, and an Oldham ring 40.

(2) Detailed Configuration (2-1) Casing The scroll compressor 10 has a vertically long cylindrical casing 20. The casing 20 has a substantially cylindrical cylindrical member 21 whose upper and lower sides are open, and an upper cover 22a and a lower cover 22b provided on the upper end and the lower end of the cylindrical member 21 (see FIG. 1). The cylindrical member 21 and the upper cover 22a and the lower cover 22b are fixed by welding so as to maintain airtightness.

  The casing 20 accommodates components of the scroll compressor 10 including the compression mechanism 30, the motor 50, the crankshaft 60, and the lower bearing 70.

  In the lower part of the casing 20, an oil sump space 26 is formed. The oil reservoir space 26 stores oil (refrigerant oil) for lubricating the sliding portion of the scroll compressor 10. The oil reservoir space 26 communicates with a first space S1 described later, into which the refrigerant compressed by the compression mechanism 30 flows (see FIG. 1).

  A suction pipe 23 for suctioning the refrigerant to be compressed by the compression mechanism 30 is provided in the upper portion of the casing 20 so as to penetrate the upper lid 22a (see FIG. 1). At the upper end of the suction pipe 23, a refrigerant pipe (not shown) that constitutes a refrigerant circuit of the air conditioner together with the scroll compressor 10 is connected. The refrigerant pipe extends upward from the upper end of the suction pipe 23 and then extends in a predetermined direction. The lower end of the suction pipe 23 is connected to the fixed scroll 31 of the compression mechanism 30 (see FIG. 1). The suction pipe 23 constitutes a part of a suction path 90 for leading the low-pressure refrigerant before compression (low-pressure refrigerant in the refrigeration cycle) sucked through the suction pipe 23 to the compression chamber Sc of the compression mechanism 30. In the suction passage 90, when the operation of the scroll compressor 10 is stopped, the suction passage 90 is closed by the valve body 81, and from the inner side to the outer side of the scroll compressor 10 (from the compression chamber Sc side to the suction pipe 23 side) A check valve mechanism 80 for preventing the flow of the refrigerant).

  A discharge pipe 24 through which a gas refrigerant discharged to the outside of the casing 20 passes is provided at an intermediate portion of the cylindrical member 21 of the casing 20 (see FIG. 1). One end of the discharge pipe 24 is disposed outside the casing 20, and the other end of the discharge pipe 24 is disposed inside the casing 20. At the outer end of the casing 20, a refrigerant pipe (not shown) that constitutes the refrigerant circuit of the air conditioning apparatus together with the scroll compressor 10 is connected. An end of the discharge pipe 24 on the inner side of the casing 20 is disposed so as to protrude into a first space S1 formed below the housing 33 of the compression mechanism 30 described later. The high-pressure refrigerant in the refrigeration cycle after compression by the compression mechanism 30 is discharged to the refrigerant pipe connected to the discharge pipe 24 via the discharge pipe 24.

(2-2) Compression Mechanism The compression mechanism 30 is a mechanism for compressing the refrigerant drawn from the suction pipe 23. As shown in FIG. 1, the compression mechanism 30 mainly includes a housing 33, a fixed scroll 31 disposed above the housing 33, and a movable scroll 32 which is combined with the fixed scroll 31 to form a compression chamber Sc. And an Oldham ring 40 for preventing rotation of the movable scroll 32 (see FIG. 1).

  Hereinafter, the Oldham ring 40, the fixed scroll 31, the movable scroll 32, and the housing 33 will be described.

(2-2-1) Oldham Ring The Oldham ring 40 will be described with reference to FIGS. 2 and 3. FIG. 2 is a plan view (top view) of the Oldham ring 40. FIG. 3 is a side view of the Oldham ring 40.

  The Oldham ring 40 is disposed between the housing 33 and the movable scroll 32 (see FIG. 1). The Oldham ring 40 is supported by the housing 33 from below.

  The Oldham ring 40 is an annular member as shown in FIG. The Oldham ring 40 is a member for preventing the movable scroll 32 from rotating and causing the movable scroll 32 to revolve with respect to the fixed scroll 31.

  The Oldham ring 40 has a ring portion 44, a plurality of (two in the present embodiment) first key portions 42, and a plurality (two in the present embodiment) second key portions 46 (see FIG. 2 and FIG. 3). The ring portion 44 has a body portion 44a having an annular shape, and a plurality of (four in the present embodiment) projecting portions 44b protruding radially outward from the outer peripheral surface of the body portion 44a. In the present embodiment, the protrusions 44 b are arranged at intervals of 90 degrees in the circumferential direction.

  The first key portion 42 is formed in a cubic shape. The two first key parts 42 extend upward (the movable scroll 32 side) from the two projecting parts 44 b of the ring part 44 disposed so as to sandwich the center of the main body part 44 a of the ring part 44 in plan view. The first key portion 42 is fitted in a key groove portion 36 which is formed so as to be recessed upward on a back surface 321 b of a movable side end plate 321 of the movable scroll 32 described later (see FIGS. 1 and 6). The first key portion 42 is configured to be slidable in the radial direction of the crankshaft 60 in the key groove portion 36.

  The second key portion 46 is formed in a cubic shape. The two second key portions 46 extend downward (toward the housing 33) from two projecting portions 44b of the ring portion 44 disposed so as to sandwich the center of the main body portion 44a of the ring portion 44 in a plan view. The protrusion 44 b provided with the second key portion 46 is a protrusion 44 b different from the protrusion 44 b provided with the first key portion 42. The second key portion 46 is fitted in a key groove 38 which is formed so as to be recessed downward on the upper surface of a second recess 33 b of the housing 33 described later (see FIG. 1). The second key portion 46 is configured to be slidable in the radial direction of the crankshaft 60 in the key groove portion 38.

  An imaginary line (not shown) connecting the two second key parts 46 (for example, the centers of gravity of the second key parts 46) in the axial direction view, and two first key parts 42 (for example, the first key part 42 in the axial direction) The virtual line (not shown) connecting the centers of gravity of the key portions 42 is in a vertical relationship. That is, the first key portions 42 and the second key portions 46 are alternately arranged at intervals of 90 degrees in the circumferential direction.

(2-2-2) Fixed Scroll As shown in FIG. 1, the fixed scroll 31 has a substantially disc-shaped fixed side end plate 311 and a spiral fixed side projecting from the front surface (lower surface) of the fixed side end plate 311. It has a wrap 312 and a peripheral portion 313 surrounding the stationary side wrap 312.

  The fixed side wrap 312 is a wall-like member that protrudes downward (the movable scroll 32 side) from the front surface of the fixed side end plate 311. When the fixed scroll 31 is viewed from the lower side, the fixed side wrap 312 is formed in a spiral shape (involute shape) from the vicinity of the center of the fixed side end plate 311 toward the outer peripheral side.

  The fixed side wrap 312 and the movable side wrap 322 of the movable scroll 32, which will be described later, are combined to form a compression chamber Sc. The fixed scroll 31 and the movable scroll 32 are combined in a state where the front surface (lower surface) of the fixed side end plate 311 and the front surface (upper surface) 321 a (see FIG. 6) of the movable side end plate 321 described later face each other. A compression chamber Sc surrounded by the fixed side wrap 312, the movable side wrap 322, and the movable side end plate 321 of the movable scroll 32 described later is formed (see FIG. 1). As described later, when the movable scroll 32 turns relative to the fixed scroll 31, the refrigerant (low-pressure refrigerant in the refrigeration cycle) flowing from the suction passage 90 into the compression chamber Sc on the peripheral side is transferred to the compression chamber Sc on the central side. It is compressed as it moves, and the pressure rises.

  A discharge port 311a is formed substantially at the center of the fixed side end plate 311 by penetrating the fixed side end plate 311 in the thickness direction (vertical direction) (see FIG. 1). The discharge port 311a communicates with the compression chamber Sc on the center side (innermost side) of the compression mechanism 30 (see FIG. 1). The high pressure refrigerant in the refrigeration cycle compressed by the compression mechanism 30 is discharged from the discharge port 311a.

  A recess 311 b (see FIG. 1) is formed on the upper surface of the fixed side end plate 311 so as to be recessed downward. The recess 311 b is formed on the upper surface of the fixed side end plate 311 in a substantially circular shape in plan view. A lid 35 is fixed to the upper surface of the fixed scroll 31 so as to close the recess 311 b (see FIG. 1). A discharge space Sa is formed between the recess 311 b and the lid 35 (see FIG. 1). The discharge space Sa communicates with the compression chamber Sc via the discharge port 311a (see FIG. 1). The high pressure refrigerant compressed in the compression chamber Sc is discharged to the discharge space Sa. The high-pressure refrigerant discharged into the discharge space Sa passes through a refrigerant passage (not shown) formed across the fixed scroll 31 and the housing 33 and flows into a first space S1 formed below the housing 33.

  The peripheral portion 313 is formed in a thick ring shape. The peripheral edge portion 313 is disposed on the outer peripheral side of the fixed side end plate 311 so as to surround the fixed side wrap 312 (see FIG. 1).

(2-2-3) Movable Scroll As shown in FIG. 1, the movable scroll 32 has a substantially disk-shaped movable side end plate 321 and a spiral movable side wrap 322 projecting from the front surface 321 a of the movable side end plate 321. And a cylindrical boss 323 projecting from the back surface 321b (see FIG. 6) of the movable side end plate 321.

  The movable side wrap 322 is a wall-like member that protrudes upward (the fixed scroll 31 side) from the front surface 321 a of the movable side end plate 321. When the fixed scroll 31 is viewed from the lower side, the fixed side wrap 312 is formed in a spiral shape (involute shape) from the vicinity of the center of the fixed side end plate 311 toward the outer peripheral side.

  A crank chamber 39a in which the boss portion 323 is disposed is formed on the back surface 321b side of the movable side end plate 321 (see FIG. 1). The crank chamber 39a communicates with the first space S1 and becomes a high pressure (high pressure in the refrigeration cycle) space during operation of the scroll compressor 10. At the time of steady operation, the pressure in the crank chamber 39 a is substantially equal to the discharge pressure of the scroll compressor 10. Further, a back pressure chamber 39b is formed on the outer peripheral side of the crank chamber 39a on the back surface 321b side of the movable side end plate 321 by a second concave portion 33b of the housing 33 described later. The back pressure chamber 39 b communicates with the compression chamber Sc in the middle of compression via, for example, a path (not shown) formed in the movable side mirror plate 321. At the time of steady operation, the pressure in the back pressure chamber 39 b is an intermediate pressure between the discharge pressure and the suction pressure of the scroll compressor 10. An upward force is exerted on the back surface 321 b of the movable side end plate 321 by the pressure of the crank chamber 39 a and the back pressure chamber 39 b, and the movable scroll 32 is pressed against the fixed scroll 31 and closely attached to the fixed scroll 31.

  A boss portion 323 is provided at the center of the back surface 321 b of the movable side end plate 321 (see FIG. 4). The boss portion 323 is a cylindrical portion extending downward from the back surface 321 b of the movable side end plate 321 (see FIG. 1). The upper end of the cylinder of the boss portion 323 is closed by the movable side end plate 321. The boss portion 323 is accommodated inside a crank chamber 39a formed by the housing 33 (see FIG. 1). The bearing metal 323a is fitted into the inside of the boss portion 323 (see FIGS. 1 and 4). The eccentric portion 61 of the crankshaft 60 is inserted into the bearing metal 323a. The movable scroll 32 is connected to the crankshaft 60 by inserting the eccentric portion 61 into the boss portion 323. The eccentric portion 61 is pivotally supported by a bearing metal 323a.

  Further, on the back surface 321b of the movable side end plate 321, a key groove portion 36 recessed in the axial direction upward is formed (see FIGS. 1 and 4). That is, the movable scroll 32 which is driven by the rotation of the crankshaft 60 and whose rotation is prevented by the Oldham ring 40 is an example of a member having the key groove portion 36. As shown in FIG. 4, a plurality of (two in the present embodiment) key grooves 36 are formed on the radially outer side of the boss 323. The two key groove portions 36 are formed to be opposite to each other across the center of the boss portion 323 in a bottom view. The first key portion 42 of the Oldham ring 40 is fitted and slides in the key groove portion 36.

  The key groove portion 36 of the movable scroll 32 and the first key portion 42 of the Oldham ring 40 fitted in the key groove portion 36 will be further described.

  The first key portion 42 has side surfaces 42a and 42b and an upper surface 42c (see FIGS. 2 and 3). The side surface 42 a and the side surface 42 b extend generally radially with respect to the center of the Oldham ring 40. The side surface 42 a and the side surface 42 b are surfaces extending in parallel with each other. The side surfaces 42a and 42b and the top surface 42c are orthogonal to each other. The side surfaces 42a and 42b are examples of the first surface. The upper surface 42c is an example of a second surface.

  The key groove portion 36 has side surfaces 36a and 36b and a bottom surface 36c (a downward surface) (see FIGS. 4 and 6). The side surface 36 a and the side surface 36 b extend substantially in the radial direction with respect to the center of the boss portion 323. The side surface 36 a and the side surface 36 b are surfaces extending parallel to each other. The side surfaces 36a and 36b and the bottom surface 36c are orthogonal to each other. The side surfaces 36a and 36b are an example of the third surface. The bottom surface 36 c is an example of a fourth surface.

  In the first key portion 42 fitted in the key groove 36, the side surfaces 42a and 42b face the side surfaces 36a and 36b of the key groove 36 in the rotational direction R of the crankshaft 60 (see FIG. 5). A slight gap (for example, several tens of micrometers) between the side surface 36a of the first key portion 42 and the side surface 36a of the key groove portion 36 facing each other and the side surface 36b of the key groove portion 36 facing the side surface 42b of the first key portion 42 ) Are placed open. When the first key portion 42 slides with respect to the key groove portion 36, the side surfaces 42a and 42b of the first key portion 42 and the side surfaces 36a and 36b of the key groove portion 36 come in sliding contact with each other.

  In the first key portion 42 fitted in the key groove portion 36, the upper surface 42 c faces the bottom surface 36 c of the key groove portion 36 in the axial direction (vertical direction) of the crankshaft 60.

  When the operation of the scroll compressor 10 is stopped (when the movable scroll 32 is not pushed toward the fixed scroll 31 by the pressure of the crank chamber 39a and the back pressure chamber 39b), it faces the upper surface 42c of the first key portion 42 The bottom surface 36 c of the key groove 36 is in a state of being in general contact. For example, when the operation of the scroll compressor 10 is stopped, the gap dimension G (see FIG. 6) between the top surface 42c of the first key portion 42 and the bottom surface 36c of the key groove portion 36 facing is 100 micrometers or less. preferable. 6 schematically shows the relationship between the first key portion 42 and the key groove portion 36, and the gap dimension G is drawn with exaggeration, and the upper surface of the actual first key portion 42. The relationship between 42c and the bottom surface 36c of the key groove 36 is not drawn.

  On the other hand, when the scroll compressor 10 is in operation (when the movable scroll 32 is pressed toward the fixed scroll 31 by the pressure of the crank chamber 39a and the back pressure chamber 39b), the upper surface 42c of the first key portion 42 is opposed. The bottom surface 36 c of the key groove 36 is in a separated state. For example, when the scroll compressor 10 is in operation, the movable scroll 32 is lifted to the fixed scroll 31 side by, for example, about 1 millimeter. As a result, when the scroll compressor 10 is in operation, the top surface 42 c of the first key portion 42 and the bottom surface 36 c of the key groove 36 facing each other are separated by about 1 millimeter.

  Next, the movement of the first key portion 42 with respect to the key groove portion 36 will be described. As described above, the first key portion 42 slides the key groove portion 36 in the radial direction A of the crankshaft 60 (the direction indicated by the arrow in FIGS. 5 and 6). FIG. 6 depicts the range of relative movement of the first key portion 42 with respect to the key groove 36. The first key portion 42 cranks between a position (first position) of the first key portion 42 drawn by a dotted line and a position (second position) of the first key portion 42 drawn by an alternate long and short dash line It moves relative to the key groove 36 in the radial direction A of the shaft 60.

  The bottom surface 36c of the key groove 36 is formed with a recess 37 which is recessed on the upper side (the opposite side of the top surface 42c of the key portion 42 to which the bottom surface 36c faces). The recess 37 is a recess having a rectangular shape in a bottom view as shown in FIG. 5 and a depth of several millimeters (for example, 2 to 3 millimeters) (see FIGS. 5 and 6). FIG. 6 schematically shows the relationship between the first key portion 42 and the key groove portion 36, and the ratio of the depth of the drawn recess 37 to the thickness of the movable side end plate 321 is an actual value. It does not show the ratio of the depth of the recess 37 to the actual thickness of the movable side mirror plate 321.

  In addition, the shape of the recessed part 37 is an example, Comprising: It is not limited to the form illustrated in FIG.5 and FIG.6. For example, the recess 37 may have a circular shape in a bottom view.

  Next, the position where the recess 37 is formed will be described.

  The upper surface 42 c of the first key portion 42 has a first portion 42 ca that faces the bottom surface 36 c of the key groove portion 36 when the operation of the scroll compressor 10 is stopped. In the present embodiment, as shown in FIG. 6, the first key portion 42 slides only with respect to the key groove portion 36 in a range where the upper surface 42 c faces the bottom surface 36 c of the key groove portion 36. The whole is a first part 42ca. Further, the bottom surface 36 c of the key groove portion 36 has a second portion 36 ca that faces the first portion 42 ca of the top surface 42 c of the first key portion 42 when the operation of the scroll compressor 10 is stopped.

  The concave portion 37 is formed at least on the second portion 36 ca of the bottom surface 36 c of the key groove portion 36 so as to be concave on the opposite side (upper side in the present embodiment) of the upper surface 42 c of the opposing first key portion 42.

  When the position at which the movable scroll 32 stops with respect to the fixed scroll 31 is not controlled, the second portion 36 ca changes in accordance with the stop position of the movable scroll 32 with respect to the fixed scroll 31 when the operation of the scroll compressor 10 is stopped. For example, when the first key portion 42 is stopped at the above-described first position (the position of the first key portion 42 drawn by a dotted line in FIG. 6), the upper surface 42 c (first portion 42 ca) of the first key portion 42 The upper surface 42c of the first key portion 42 when the opposing second portion 36ca and the first key portion 42 stop at the above-described second position (the position of the first key portion 42 drawn by a dashed dotted line in FIG. 6). The (first portion 42ca) and the opposing second portion 36ca are different portions.

  Therefore, regardless of the positional relationship between the movable scroll 32 and the fixed scroll 31 when the operation of the scroll compressor 10 is stopped, the concave portion 37 is formed in the second portion 36ca facing at least the first portion 42ca of the upper surface 42c of the first key portion 42. Here, at least a portion of the recess 37 is always formed in the facing region 36cb (see FIGS. 5 and 6).

  The always facing region 36cb will be described. As shown in FIG. 6, in the present embodiment, the first key portion 42 disposed at the first position and the first key portion 42 disposed at the second position are in a partially overlapping relationship. Therefore, the bottom surface 36c of the key groove 36 always includes a region facing the upper surface 42c of the first key portion 42 (regardless of the operation stop time and the operation time of the scroll compressor 10). This area is always called the opposite area 36cb.

  By forming at least a portion of the recess 37 in the opposing region 36cb at all times, at least a portion of the recess 37 is opposed to the first portion 42ca of the upper surface 42c of the first key portion 42 when the operation of the scroll compressor 10 is stopped. It is easy to form in two parts 36ca.

  Preferably, the recess 37 is always formed only in the facing region 36cb. For example, in the form shown in FIG. 5, the recess 37 is always formed only in the facing region 36cb. Particularly in this case, the recess 37 is always formed in the center of the facing region 36cb, and the periphery of the recess 37 is always surrounded by the bottom surface 36c belonging to the facing region 36cb.

  In addition, it is preferable that the second portion 36ca of the bottom surface 36c of the key groove portion 36 in which the recess 37 is formed have an oil holding surface 36cs around the recess 37 to suppress the flow of oil from the recess 37 at the time of operation stop ( See Figure 5). The oil retaining surface 36cs means a second portion 36ca of the bottom surface 36c (except for the recess 37 being formed) disposed around the recess 37. At the time of operation stop, the gap dimension G between the oil holding surface 36cs (in other words, the second portion 36ca of the bottom surface 36c) and the opposing surface (the upper surface 42c of the first key portion 42) is 100 μm as described above. Less than a meter. With this configuration, the oil present in the recess 37 at the time of operation stop is likely to be held until the start of the next operation of the scroll compressor 10. When the recess 37 is always formed only in the facing region 36cb and is surrounded by the bottom surface 36c that always belongs to the facing region 36cb as in the example of FIGS. The oil present at the position is likely to be held until the start of operation of the next scroll compressor 10.

(2-2-4) Housing The housing 33 is press-fit into the cylindrical member 21 and is fixed over the entire circumferential direction on the outer peripheral surface thereof. The housing 33 is disposed adjacent to the fixed scroll 31 and the movable scroll 32. The housing 33 is disposed below the fixed scroll 31 and the movable scroll 32. The housing 33 and the fixed scroll 31 are disposed such that the upper end surface (not shown) of the housing 33 faces the lower surface of the peripheral edge portion 313 of the fixed scroll 31, and are fixed by bolts or the like not shown.

  In the housing 33, a first recess 33a disposed so as to be recessed in the upper surface central portion, an upper bearing 33c disposed below the first recess 33a, and a second recess disposed so as to surround the first recess 33a And 33b (see FIG. 1).

  The first recess 33 a is formed in a circular shape in plan view. The first recess 33a forms a crank chamber 39a therein. In the crank chamber 39a, a boss portion 323 of the movable scroll 32 in which an eccentric portion 61 of a crankshaft 60 described later is inserted is disposed.

  The bearing metal 34 is inserted into the upper bearing 33c (see FIG. 1). The crankshaft 60 is inserted into the bearing metal 34. The bearing metal 34 rotatably supports the main shaft 62 of the crankshaft 60.

  The second recess 33 b is provided on the upper surface of the housing 33. The second recess 33 b is formed to surround the first recess 33 a in a plan view. An Oldham ring 40 is disposed in the second recess 33 b.

  A plurality of (two in the present embodiment) key groove portions 38 are formed on the upper surface of the second recess 33 b (see FIG. 1). The key groove 38 is formed to be recessed downward. The key groove 38 is formed to extend in the radial direction of the crankshaft 60. The two key groove portions 38 are formed so as to be opposite to each other across the center of the housing 33 in plan view. The second key portion 46 of the Oldham ring 40 is fitted and slides in the key groove portion 38.

  In the key groove portion 38 and the second key portion 46, the key groove portion 36 is recessed upward and the first key portion 42 extends upward from the ring portion 44, whereas the key groove portion 38 is recessed downward and the second key portion 46 is Although it differs in that it extends downward from the ring portion 44, the description is omitted because it is the same except for this point. In the present embodiment, a concave portion corresponding to the concave portion 37 is not formed on the surface of the upper surface of the key groove portion 38 of the housing 33 facing the lower surface of the second key portion 46 when the operation of the scroll compressor 10 is stopped. .

(2-3) Motor The motor 50 drives the movable scroll 32. The motor 50 has an annular stator 51 fixed to the inner wall surface of the cylindrical member 21 and a rotor 53 rotatably accommodated inside the stator 51 with a slight gap (air gap) (see FIG. 1). ).

  The rotor 53 is a cylindrical member, and the crankshaft 60 is inserted inside. The rotor 53 is connected to the movable scroll 32 via a crankshaft 60. The motor 50 drives the movable scroll 32 by rotating the rotor 53 and turns the movable scroll 32 with respect to the fixed scroll 31.

(2-4) Crankshaft The crankshaft 60 is disposed to extend in the vertical direction along the axial center of the cylindrical member 21, and connects the rotor 53 of the motor 50 and the movable scroll 32 of the compression mechanism 30. The crankshaft 60 transmits the driving force of the motor 50 to the movable scroll 32.

  The crankshaft 60 has a main shaft 62 whose central axis coincides with the axial center of the cylindrical member 21 and an eccentric portion 61 eccentric to the axial center of the cylindrical member 21 (the central axis of the main shaft 62) (see FIG. 1) . A refueling passage 63 is formed inside the crankshaft 60 (see FIG. 1).

  The eccentric portion 61 is disposed above the main shaft 62. The eccentric portion 61 is connected to the boss portion 323 of the movable scroll 32.

  The main shaft 62 is rotatably supported by a bearing metal 34 disposed in an upper bearing 33 c provided in the housing 33 and a bearing metal 71 disposed in a lower bearing 70 described later. Further, the main shaft 62 is connected to the rotor 53 of the motor 50 between the upper bearing 33 c and the lower bearing 70. The main shaft 62 rotates around a vertical axis extending in the vertical direction.

  The oil supply path 63 is an oil flow path for supplying oil to the sliding portion of the scroll compressor 10. The oil supply path 63 extends in the axial direction of the crankshaft 60 from the lower end to the upper end of the crankshaft 60 and opens at the upper and lower ends of the crankshaft 60.

  An oil supply pump 65 is attached to the lower end of the crankshaft 60 (see FIG. 1). The feed pump 65 is a positive displacement pump such as a trochoid pump. The lower end of the oil suction port 65a of the feed pump 65 is disposed in the oil reservoir space 26 (see FIG. 1). The discharge port of the feed pump 65 is connected to the lower end of the feed passage 63. When the crankshaft 60 rotates, the oil supply pump 65 is driven, and oil is drawn up from the oil storage space 26 through the suction port 65 a and flows into the oil supply path 63. The oil that has flowed into the oil supply path 63 flows upward in the crankshaft 60. Part of the oil flowing through the oil supply passage 63 is conveyed to the opening on the upper end side of the oil supply passage 63, lubricates the bearing metal 323a and the eccentric portion 61, and then flows into the crank chamber 39a. Further, a part of the oil flowing through the oil supply passage 63 passes through a passage (not shown) formed inside the crank shaft 60, and a sliding portion between the upper bearing 33 c and the crank shaft 60, the lower bearing 70 and the crank shaft 60. And the sliding part of the Further, the oil carried to the upper end of the oil supply path 63 passes through another path (not shown), or as a mist of oil, the sliding parts of other parts, for example, the thrust surface of the fixed scroll 31 and the movable scroll 32 , And the sliding portion of the Oldham ring 40 and the like.

(2-5) Lower Bearing The lower bearing 70 (see FIG. 1) is disposed below the motor 50. The lower bearing 70 is fixed to the cylindrical member 21 of the casing 20. The lower bearing 70 includes a bearing metal 71 accommodated therein (see FIG. 1). The bearing metal 71 rotatably supports the lower side of the main shaft 62 of the crankshaft 60.

(3) Operation of Scroll Compressor The operation of the scroll compressor 10 will be described.

  When the motor 50 is driven, the rotor 53 rotates, and the crankshaft 60 connected to the rotor 53 also rotates. When the crankshaft 60 rotates, the movable scroll 32 revolves relative to the fixed scroll 31 without rotating on its own due to the function of the Oldham ring 40. Then, a low pressure (at suction pressure) refrigerant is sucked into the casing 20 through the suction pipe 23. More specifically, a low-pressure refrigerant is sucked from the suction pipe 23 to the compression chamber Sc from the peripheral side of the compression chamber Sc. As the movable scroll 32 revolves, the suction pipe 23 does not communicate with the compression chamber Sc, and as the volume of the compression chamber Sc decreases, the pressure in the compression chamber Sc increases. The pressure of the refrigerant increases as it moves from the compression chamber Sc on the peripheral side to the compression chamber Sc on the central side, and finally the pressure becomes high (discharge pressure). The high-pressure refrigerant compressed by the compression mechanism 30 is discharged into the discharge space Sa from the discharge port 311 a located near the center of the fixed side end plate 311. The high-pressure refrigerant in the discharge space Sa passes through a refrigerant passage (not shown) formed in the fixed scroll 31 and the housing 33 and flows into the first space S1 below the housing 33. The high-pressure refrigerant flowing into the first space S1 is discharged from the discharge pipe 24 to the outside of the scroll compressor 10.

(4) Characteristics (4-1)
The scroll compressor 10 according to the present embodiment is a member having an Oldham ring 40 having a first key portion 42 as an example of a key portion, and a key groove 36 on which the first key portion 42 of the Oldham ring 40 is fitted In the present embodiment, the movable scroll 32) and the crankshaft 60 are provided. The scroll compressor 10 changes the volume of the compression chamber Sc by the rotation of the crankshaft 60 to compress the refrigerant. The first key portion 42 has side surfaces 42a and 42b as an example of a first surface orthogonal to each other, and an upper surface 42c as an example of a second surface. The key groove portion 36 has side surfaces 36a and 36b as an example of a third surface orthogonal to each other and a bottom surface 36c as an example of a fourth surface. The side surfaces 42 a and 42 b of the first key portion 42 face the side surfaces 36 a and 36 b of the key groove portion 36 in the rotational direction of the crankshaft 60. The upper surface 42 c of the first key portion 42 faces the bottom surface 36 c of the key groove portion 36. The upper surface 42c of the first key portion 42 has a first portion 42ca that faces the bottom surface 36c of the key groove portion 36 when the operation is stopped. The bottom surface 36 c of the key groove portion 36 has a second portion 36 ca that faces the first portion 42 ca of the top surface 42 c of the first key portion 42 when the operation is stopped. The second portion 36 ca is formed with a recess 37 that is recessed on the opposite side to the opposite surface (upper surface 42 c of the first key portion 42).

  In the scroll compressor 10, since the oil is held in the recess 37 at the time of operation stop, the side surfaces 42a and 42b of the first key portion 42 and the side surfaces 36a and 36b of the key groove portion 36 during the operation stop by the flow of liquid refrigerant or the like. Even when the oil between the two sides is lost, oil can be supplied from the recess 37 between the side surfaces 42a and 42b and the side surfaces 36a and 36b at the start of operation.

  For example, to give a specific example, when the operation of the scroll compressor 10 is stopped, the valve body 81 of the check valve mechanism 80 disposed in the suction passage 90 is connected to the suction pipe 23 or the refrigerant pipe connected to the suction pipe 23 There is a possibility that the liquid refrigerant flows into the scroll compressor 10 from the suction pipe 23 by opening due to the weight of the liquid refrigerant condensed and accumulated. When such a state occurs, the oil between the side surfaces 42a and 42b of the first key portion 42 and the side surfaces 36a and 36b of the key groove 36 may be washed away by the liquid refrigerant. In particular, when the first key portion 42 of the Oldham ring 40 is disposed immediately below the suction passage 90, the space between the side surfaces 42 a and 42 b of the first key portion 42 and the side surfaces 36 a and 36 b of the key groove 36 is The oil is likely to be washed away by the liquid refrigerant. Also in such a case, oil can be supplied from the recess 37 between the side surfaces 42a and 42b and the side surfaces 36a and 36b at the start of operation.

  Therefore, in the scroll compressor 10, an oil supply failure is unlikely to occur in the sliding portion between the first key portion 42 and the key groove portion 36 at the start of operation.

(4-2)
In the scroll compressor 10 of the present embodiment, the member includes the movable scroll 32 which is driven by the rotation of the crankshaft 60 and whose rotation is prevented by the Oldham ring 40.

  Here, the occurrence of a refueling failure between the key groove portion 36 formed in the movable scroll 32 and the first key portion 42 of the Oldham ring 40 can be suppressed.

(4-3)
In the scroll compressor 10 of the present embodiment, the upper surface 42 c of the first key portion 42 as an example of the second surface is the upper surface of the first key portion 42. The bottom surface 36 c of the key groove 36 as an example of the fourth surface is a downward surface.

  Here, even if the liquid refrigerant flows around the first key portion 42 while the operation is stopped, a recess is formed on the side surfaces 42 a and 42 b of the first key portion 42 and the side surfaces 36 a and 36 b of the key groove portion 36. The oil in the recess 37 is less likely to flow by the liquid refrigerant. Further, at the start of operation, the oil in the recess 37 is easily supplied between the side surfaces 42a and 42b and the side surfaces 36a and 36b by gravity.

(4-4)
In the scroll compressor 10 of the present embodiment, the second portion 36 ca of the second portion 36 c of the bottom surface 36 c of the key groove 36 in which the recess 37 is formed is an oil around the recess 37 that suppresses the flow of oil from the recess 37 when the operation is stopped It has a holding surface 36 cs.

  Here, the outflow of oil in the recess 37 is likely to be suppressed when the operation is stopped.

(4-5)
In the scroll compressor 10 of the present embodiment, the gap dimension G between the oil holding surface 36cs and the surface (upper surface 42c of the first key portion 42) opposed to the oil holding surface 36cs at the time of operation stop is 100 μm or less Of the

  Here, when the operation is stopped, the outflow of oil from the recess 37 is easily suppressed.

(4-6)
In the scroll compressor 10 according to the present embodiment, the area where the recess 37 is formed always faces the upper surface 42c of the first key portion 42 or the bottom surface 36c of the key groove 36 regardless of operation stop and operation. It includes a region 36cb.

  Here, even if the liquid refrigerant flows around the first key portion 42 while the operation is stopped, the occurrence of a situation where the oil in the concave portion 37 disappears can be easily suppressed.

(4-7)
In the scroll compressor 10 of the present embodiment, the region where the recess 37 is formed includes only the facing region 36cb at all times.

  Here, even if the liquid refrigerant flows around the first key portion 42 while the operation is stopped, the occurrence of the situation where the oil in the concave portion 37 disappears is particularly easily suppressed.

(5) Modification A modification of this embodiment is shown below. Note that some or all of the plurality of modifications may be combined with other modifications without departing from the scope of the present invention.

(5-1) Modification A
In the above embodiment, as in the example of FIG. 5 and FIG. 6, the concave portion 37 is always formed only in the facing region 36 cb. However, the area where the recess 37 is formed is not always limited to the facing area 36cb. For example, as in the recess 37 'of FIG. 7, the recess 37' may be formed also in the region other than the facing region 36cb.

(5-2) Modification B
In the above embodiment, the position at which the movable scroll 32 stops when the operation of the scroll compressor 10 is stopped is not controlled (the movable scroll 32 stops at an arbitrary position relative to the fixed scroll 31). On the other hand, when the position at which the movable scroll 32 stops with respect to the fixed scroll 31 is controlled when the operation of the scroll compressor 10 is stopped (when controlled to stop at the same position) The second portion 36ca of the bottom surface 36c, that is, the portion facing the upper surface 42c (the first portion 42ca) of the first key portion 42, has the same position each time.

  Therefore, in the case where the position at which the movable scroll 32 stops with respect to the fixed scroll 31 is controlled, if at least a part of the recess 37 is formed in the second portion 36ca, the recess 37 is always formed in the facing region 36cb. It does not have to be.

(5-3) Modification C
In the above embodiment, the recess 37 is formed in the second portion 36 ca of the bottom surface 36 c of the key groove 36. However, the present invention is not limited to such an embodiment, and instead of the second portion 36ca of the bottom surface 36c of the key groove 36, or in addition to the second portion 36ca of the bottom surface 36c of the key groove 36, FIGS. As in 9, a recess 47 may be formed on the upper surface 42c of the first key portion 42 of the Oldham ring 40. That is, in the above embodiment, the second portion 36 ca of the bottom surface 36 c of the key groove 36 is formed with the recess 37 recessed on the opposite side to the upper surface 42 c of the opposing first key portion 42. Alternatively, in addition to the recess 37, the first portion 42ca of the upper surface 42c of the first key portion 42 may be formed with a recess 47 recessed on the opposite side (downward) of the bottom surface 36c of the opposing key groove 36.

  Here, the top surface 42c of the first key portion 42 is a constantly facing region 42cb that faces the bottom surface 36c of the key groove 36 regardless of whether the entire scroll compressor 10 is stopped or operated. Therefore, here, the entire recess 47 is always formed in the facing region 42cb.

  In another embodiment, in the case where a portion of the top surface 42c of the first key portion 42 includes a portion that does not always face the bottom surface 36c of the key groove 36, the position where the recess 47 is formed It should be decided. Preferably, at least a portion of the recess 47 is always formed in the facing region 42cb, and more preferably, the whole is always formed in the facing region 42cb.

  The first portion 42 ca of the upper surface 42 c of the first key portion 42 in which the recess 47 is formed holds oil around the recess 47 to suppress the flow of oil from the recess 47 when the operation of the scroll compressor 10 is stopped. It is preferred to have a face 42 cs.

  In addition, since the recessed part 47 of this modification is the same as that of the recessed part 37 of the said embodiment except the position formed being different, in order to avoid duplication of description, the other description is abbreviate | omitted.

(5-4) Modification D
In the above embodiment, a recess corresponding to the recess 37 is not formed on the upper surface of the key groove 38 of the housing 33, and the lower surface of the second key 46 of the Oldham ring 40 also corresponds to the recess 47 of modification C. No recess is formed.

  However, the present invention is not limited to this, and a first portion of the lower surface of the second key portion 46 of the Oldham ring 40 facing the upper surface of the key groove portion 38 of the housing 33 when the operation of the scroll compressor 10 is stopped. At least one of the second portions of the upper surface of the key groove portion 38 facing the lower surface of the second key portion 46 of the Oldham ring 40 when the operation of the scroll compressor 10 is stopped It may be formed. Detailed description is omitted.

(5-5) Modification E
In the above embodiment, the Oldham ring 40 has the first key portion 42 extending upward and the second key portion 46 extending downward, but is not limited thereto.

  For example, as shown in FIG. 10, the Oldham ring 240 of the scroll compressor 200 extends upward and is fitted into a key groove 36 formed in the movable scroll 32 (not shown in FIG. 10); The second key portion 246 may extend upward and may be fitted into a key groove 238 formed in the fixed scroll 31.

  That is, the scroll compressor 200 includes the Oldham ring 240 having the second key portion 246, the fixed scroll 31 having the key groove portion 238 on which the second key portion 246 of the Oldham ring 240 is fitted and sliding, and the crankshaft 60. The volume of the compression chamber Sc is changed by the rotation of the crankshaft 60 to compress the refrigerant. The second key portion 246 has a side surface 246a as an example of a first surface orthogonal to each other and an upper surface 246c as an example of a second surface. The key groove portion 238 has a side surface 238 a as an example of a third surface orthogonal to each other and a bottom surface 238 c as an example of a fourth surface. The side surface 246 a of the second key portion 246 faces the side surface 238 a of the key groove portion 238 in the rotational direction of the crankshaft 60. The upper surface 246 c of the second key portion 246 faces the bottom surface 238 c of the key groove 238. The upper surface 246c of the second key portion 246 has a first portion 246ca that faces the bottom surface 238c of the key groove 238 when the operation is stopped. The bottom surface 238 c of the key groove portion 238 has a second portion 238 ca that faces the first portion 246 ca of the top surface 246 c of the second key portion 246 when the operation is stopped. The second portion 238ca of the bottom surface 238c of the key groove portion 238 is formed with a recess 237 recessed on the opposite side to the opposite surface. That is, in addition to the recess 37 being formed on the bottom surface 36 c of the key groove 36, the recess 237 is also formed on the bottom surface 238 c of the key groove 238 of the fixed scroll 31.

  In addition, since the recessed part 237 of this modification is the same as that of the recessed part 37 of the said embodiment except the point in which the position formed is the fixed scroll 31, in order to avoid duplication of description, other description is abbreviate | omitted. In addition, since the configuration excluding the second key portion 246 and the key groove portion 238 of the scroll compressor 200 is the same as that of the scroll compressor 10, the other descriptions will be omitted.

  As in the modification C, instead of the recess 237 or in addition to the recess 237, the first portion 246ca of the upper surface 246c of the second key portion 246 has a recess recessed on the opposite side to the opposite surface. It may be (not shown).

(5-6) Modification F
Although the scroll compressor 10 of the said embodiment is a vertical scroll compressor in which the crankshaft 60 extends in the vertical direction, it is not limited to this. The configuration of the above embodiment may be applied to a horizontal scroll compressor in which the crankshaft of the scroll compressor extends in the horizontal direction.

  While the embodiments and modifications of the present disclosure have been described above, it is understood that various changes in form and detail can be made without departing from the spirit and scope of the present disclosure as set forth in the claims. Will.

  The present disclosure is broadly applicable and useful to scroll compressors that use Oldham rings.

10, 200 scroll compressor 31 fixed scroll (member)
32 Movable scroll (member)
36 Keyway 36a, 36b Side (third surface)
36c bottom (fourth side)
36ca second portion 36cb always opposite region 36cs oil holding surface 37 recessed portion 37 'recessed portion 40 oldham ring 42 first key portion (key portion)
42a, 42b side surface (first surface)
42c upper surface (second surface)
42ca 1st portion 42cb Always opposite region 42cs Oil holding surface 47 Recess 60 60 Crankshaft 238 Key groove 238a Side surface (third surface)
238c bottom (fourth side)
238ca Second part 240 Oldham ring 246 second key part (key part)
246a side surface (first surface)
246c upper surface (second surface)
246ca First part G Clearance dimension R Rotation direction Sc Compression chamber

Unexamined-Japanese-Patent No. 2010-031677

Claims (7)

An Oldham ring (40, 240) having a key portion (42, 246), a member (32, 31) having a key groove portion (36, 238) on which the key portion of the Oldham ring is fitted (60), wherein the volume of the compression chamber (Sc) is changed by the rotation of the crankshaft to compress the refrigerant,
The key portion has a first surface (42a, 42b, 246a) and a second surface (42c, 246c) orthogonal to each other,
The key groove has a third surface (36a, 36b, 238a) and a fourth surface (36c, 238c) orthogonal to each other,
The first surface of the key portion faces the third surface of the key groove portion in the rotational direction (R) of the crankshaft,
The second surface of the key portion faces the fourth surface of the key groove portion,
The second surface of the key portion has a first portion (42ca, 246ca) facing the fourth surface of the key groove portion when the operation is stopped,
The fourth surface of the key groove portion has a second portion (36ca, 238ca) facing the first portion of the second surface of the key portion when the operation is stopped,
At least one of the first portion and the second portion is formed with a recess (37, 37 ', 47, 237) recessed on the opposite side to the opposite surface.
Scroll compressor (10, 200). The member includes at least one of a movable scroll (32) which is driven by rotation of the crank shaft and whose rotation is prevented by the Oldham ring, and a fixed scroll (31) which forms the compression chamber together with the movable scroll. including,
The scroll compressor according to claim 1. The second surface of the key portion is an upper surface of the key portion,
The fourth surface of the key groove portion is a downward surface.
The scroll compressor according to claim 1. At least one of the first portion and the second portion in which the recess is formed has an oil holding surface (36 cs, 42 cs) around the recess, which suppresses the flow of oil from the recess when the operation is stopped. Have,
The scroll compressor according to any one of claims 1 to 3. The oil holding surface is a surface having a gap dimension (G) of 100 μm or less with the surface (42c, 36c, 246c) to which the oil holding surface faces when the operation is stopped.
The scroll compressor according to claim 4. The region in which the recess is formed includes a constantly facing region (36cb, 42cb) that faces the second surface of the key portion or the fourth surface of the key groove regardless of operation stop and operation. ,
The scroll compressor according to any one of claims 1 to 5. The area where the recess (37, 47, 237) is formed includes only the always facing area.
The scroll compressor according to claim 6.

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