JP6610315B2 - Scroll compressor - Google Patents

Description

  The present invention relates to a scroll compressor that compresses a fluid.

  A scroll-type compressor used as a compressor for a refrigeration cycle includes a pair of scrolls including a fixed scroll and a turning scroll. A scroll compressor compresses fluid (refrigerant) in the space by revolving the orbiting scroll with respect to the fixed scroll and reducing the volume of a plurality of spaces formed between the two scrolls. While sending out.

  Each scroll has a substrate portion formed in a flat plate shape and a spiral spiral wall extending perpendicularly from the main surface of the substrate portion. During the operation of the scroll compressor, the orbiting scroll revolves while the side surface of the spiral wall of the orbiting scroll is pressed against the side surface of the spiral wall of the fixed scroll. At this time, the fluid existing in the space between the fixed scroll and the orbiting scroll is compressed to a high pressure. For this reason, both the force due to the pressure of the fluid and the force exerted by each other due to the contact between the spiral walls are applied to the substrate portion and the spiral wall of each scroll.

  As a result, stress concentration is likely to occur at the connecting portion between the substrate portion and the spiral wall in the scroll, and there is a concern that the scroll may be damaged at the portion. In view of this, for example, the connecting portion has an arc shape to relieve stress in the portion (see, for example, Patent Document 1 below).

  When the arc-shaped connecting portion is formed as described above, if the chamfer is not chamfered at the tip of the spiral wall of the counterpart scroll, interference occurs when combined. For this reason, the corners are chamfered to prevent interference.

  However, when the chamfering of the tip of the spiral wall is a general chamfering such as C chamfering, the cross-sectional area of the gap formed with the mating shape on the other side becomes large, and the fluid that is being compressed from the gap There is a possibility that the amount of fluid flowing out to the low pressure side increases and the fluid cannot be efficiently compressed. Therefore, in the scroll compressor described in Patent Document 1 below, the chamfered shape of the tip end portion of the spiral wall has an arc shape similar to the connecting portion on the other side, and the gap formed between the connecting portions is reduced. .

JP 2001-55989 A

  In the scroll compressor described in Patent Document 1, in order to reliably prevent the fixed scroll and the orbiting scroll from interfering with each other in the chamfered portion, the shape of the mating portion on the other side is prevented. The shape of the chamfer is different. Specifically, the radius of curvature of the chamfer formed at the tip portion of the spiral wall is made larger than the radius of curvature of the connecting portion formed at the root portion of the spiral wall.

  In such a configuration, interference between the fixed scroll and the orbiting scroll is prevented, but it is difficult to sufficiently reduce the gap between the chamfered portions. In particular, since a large chamfer is formed at the tip of the spiral wall, there is a tendency for fluid leakage near the chamfered portion to increase.

  In addition, in order to prevent the occurrence of “cash” due to contact sliding, increase in sliding resistance, and chip seal melting due to sliding heat generation, during operation between the fixed scroll and the orbiting scroll. It is necessary to secure the thrust gap to be formed with a predetermined size. However, if such a constant thrust gap is to be ensured, the gap in the vicinity of the large chamfering applied to the tooth tip portion further increases, and the fluid leakage becomes so large that it cannot be ignored.

  Furthermore, when carbon dioxide is used as the fluid to be compressed, the pressure difference between the high-pressure portion and the low-pressure portion becomes very large inside the scroll compressor. For this reason, in the configuration in which the chamfered portion is applied to the tooth tip portion, the fluid leakage is further increased.

  The present invention has been made in view of such a problem, and the object thereof is to sufficiently suppress the leakage of fluid during operation while the chamfered end portion of the spiral wall of the scroll is provided. Another object of the present invention is to provide a scroll compressor that can efficiently compress a fluid.

In order to solve the above problems, a scroll compressor according to the present invention is a scroll compressor (10) for compressing fluid, and a fixed scroll (200) fixed inside a casing (11), A revolving scroll (100) that revolves inside the casing. The fixed scroll and the orbiting scroll each have a flat plate-like substrate portion (110, 210) and a spiral spiral wall (120, 220) extending perpendicularly from the main surface (111, 211) of the substrate portion. The substrate portion of the fixed scroll and the substrate portion of the orbiting scroll are disposed to face each other so that the spiral walls are engaged with each other. The first scroll, which is one of the fixed scroll and the orbiting scroll, is a first tooth side surface (122) which is a side surface of the spiral wall, a surface formed at the tip of the spiral wall, and the first tooth side surface. A chamfered portion (123) is formed at a portion where the first tooth side surface and the tooth tip surface are connected to each other. The second scroll, which is the other of the fixed scroll and the orbiting scroll, is a second tooth side surface (222) which is the side surface of the spiral wall, and the main surface of the substrate portion and is perpendicular to the second tooth side surface. And a bottom surface (211) that is a surface, a portion where the second tooth side surface and the bottom surface are connected, and a portion facing the chamfered portion (213) is formed. When the direction perpendicular to the root surface is the extending direction, the first dimension (L1) that is the dimension of the chamfered portion along the extending direction is the second dimension that is the dimension of the connecting portion along the extending direction ( The chamfered portion and the connecting portion are formed so as to be smaller than L2). The shape of the chamfered portion formed on the spiral wall of the first scroll is cut from the chamfered portion so that the surface shape of the chamfered portion is the same as the surface shape of the connecting portion. The shape is the same as that formed when cut and removed along the surface (VS). In the cross section perpendicular to the root surface, each of the chamfered portion and the connecting portion has at least a part of a curved portion (123, 213, 123A, 1232B, 2132B) whose cross-sectional shape is an arc shape. .

  In the scroll compressor having such a configuration, the first dimension of the chamfered portion formed between the first tooth side surface and the tooth tip surface is the connecting portion formed between the second tooth side surface and the tooth bottom surface. It is smaller than the second dimension. Thereby, the increase amount of the clearance gap by having chamfered on the tooth-tip surface side can be suppressed to 0 or the minimum. Since the gap formed between the first scroll and the second scroll is suppressed to a size that should be secured as a minimum as the thrust gap, fluid leakage during the operation of the scroll compressor is sufficiently suppressed. be able to.

  ADVANTAGE OF THE INVENTION According to this invention, although it is the structure by which the front-end | tip part of the spiral wall which a scroll has was given, the leakage of the fluid in operation | movement is fully suppressed and the scroll type compression which can compress a fluid efficiently A machine is provided.

It is sectional drawing which shows the whole structure of the scroll compressor which concerns on 1st Embodiment of this invention. It is a perspective view which shows the shape of a turning scroll among the scroll compressors shown by FIG. It is a figure for demonstrating operation | movement of the scroll compressor shown by FIG. It is sectional drawing which shows the shape of a turning scroll and a fixed scroll. It is sectional drawing which shows the shape of a turning scroll and a fixed scroll of the scroll compressor which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the shape of the turning scroll shown by FIG. It is sectional drawing which shows the shape of a turning scroll and a fixed scroll of the scroll compressor which concerns on 3rd Embodiment of this invention. It is a figure for demonstrating the shape of the turning scroll shown by FIG. It is sectional drawing which shows the shape of a turning scroll and a fixed scroll of the scroll compressor which concerns on 4th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  A scroll compressor 10 according to a first embodiment of the present invention will be described. The scroll compressor 10 is used as a compressor for compressing and sending out refrigerant in a vapor compression refrigeration cycle. As shown in FIG. 1, the scroll compressor 10 is provided with various mechanisms for compressing and feeding a refrigerant, which is a fluid, inside a substantially cylindrical casing 11. In this embodiment, carbon dioxide is used as the refrigerant.

  The casing 11 is provided with an inlet portion 12 that is a portion to which a refrigerant to be compressed is supplied, and an outlet portion (not shown) that is an outlet of the compressed refrigerant. In addition, a pair of scrolls (the orbiting scroll 100 and the fixed scroll 200) for compressing the refrigerant are disposed inside the casing 11 and connecting the inlet portion 12 and the outlet portion. Among these, the fixed scroll 200 is fixed inside the casing 11. On the other hand, the orbiting scroll 100 can orbit within the casing 11.

  When the scroll compressor 10 is operating, the refrigerant flows into the casing 11 from the inlet 12 and is drawn into the working chamber, which is a space formed between the orbiting scroll 100 and the fixed scroll 200. As will be described in detail later, the orbiting scroll 100 revolves (turns) with respect to the fixed scroll 200. Thereby, the volume of the working chamber is reduced, and the refrigerant in the working chamber is compressed.

  The refrigerant compressed between the orbiting scroll 100 and the fixed scroll 200 passes through a through hole 291 formed at the center of the fixed scroll 200 and flows into the space 14 formed on the lower side of the fixed scroll 200. Thereafter, the refrigerant passes through the outlet passage 13 and is discharged from the outlet portion to the outside.

  In FIG. 1, reference numeral 15 denotes a lubricating oil supply port. Hereinafter, it is referred to as “lubricating oil supply port 15”. In the present embodiment, a separator (not shown) is provided outside the scroll compressor 10. The separator is for receiving the refrigerant discharged from the outlet of the scroll compressor 10 and separating and removing the lubricating oil contained in the refrigerant. The refrigerant is discharged to the outside after the lubricating oil is removed in the separator. The lubricating oil supply port 15 is an inlet for receiving the lubricating oil removed from the refrigerant by the separator. The lubricating oil received from the lubricating oil supply port 15 is supplied to each part in the casing 11 and reused.

  A mechanism for driving the orbiting scroll 100 to make a revolving motion will be described. Inside the casing 11, a stator 21 and a mover 22 are provided, and these constitute a rotating electrical machine. The stator 21 is a cylindrical member fixed to the inner surface of the casing 11 and has a plurality of coils.

  The mover 22 is a cylindrical magnetic body disposed inside the stator 21, and is disposed in a state in which the central axis thereof coincides with the central axis of the stator 21. When power is supplied from the power supply terminal 30 provided at the upper end portion of the casing 11, a current flows through the coil of the stator 21, and electromagnetic force is generated between the stator 21 and the mover 22. The mover 22 receives the electromagnetic force and rotates around its central axis.

  A shaft 23 is fixed to the mover 22. The shaft 23 is a cylindrical member that penetrates the movable element 22, and the central axis thereof coincides with the central axis of the movable element 22. The upper part of the mover 22 is rotatably supported by a bearing 24, and the lower part is rotatably supported by a bearing 25. When the mover 22 is rotated by receiving power supply, the shaft 23 is also rotated around the central axis.

  An eccentric portion 26 is formed in the lower end portion of the shaft 23, that is, in the vicinity of the end portion on the orbiting scroll 100 side. The eccentric part 26 is formed in a cylindrical shape like the other parts of the shaft 23. However, although the central axis of the eccentric part 26 is parallel to the central axis of the movable element 22, it does not coincide with the central axis of the movable element 22.

  A cylindrical projecting portion 292 is formed on the upper surface of the orbiting scroll 100 so as to project upward. The eccentric portion 26 is inserted into the protruding portion 292 from above. That is, the protruding portion 292 is formed as a portion surrounding the eccentric portion 26.

  For this reason, when the mover 22 and the shaft 23 are rotated by receiving the supply of electric power, the orbiting scroll 100 turns around the central axis of the mover 22 together with the eccentric portion 26, that is, revolves. Note that the orbiting scroll 100 is prevented from rotating about its central axis by a rotation prevention mechanism (not shown).

  The scroll shape will be described with reference to FIG. In the perspective view shown in FIG. 2, a state when the orbiting scroll 100 is viewed from below is schematically depicted. The orbiting scroll 100 has a substrate part 110 and a spiral wall 120.

  The substrate part 110 is a part formed in a flat plate shape. In FIG. 2, the substrate portion 110 is drawn in a shape that is a perfect circle when viewed from above, but the actual shape of the substrate portion 110 is different from this. For example, in FIG. 2, illustration of a rotation prevention mechanism for preventing rotation of the orbiting scroll 100 is omitted, and the whole is schematically illustrated.

  The spiral wall 120 is a spiral wall formed on the lower surface of the substrate portion 110, that is, the main surface 111 on the fixed scroll 200 side. The spiral wall 120 is formed so as to extend perpendicularly from the main surface 111.

  The shape of the fixed scroll 200 is substantially the same as the shape of the orbiting scroll 100 shown in FIG. That is, the fixed scroll 200 also has a flat plate-like substrate portion 210 and a spiral wall 220 extending perpendicularly from the main surface 211 on the upper side (the turning scroll 100 side) of the substrate portion 210. As shown in FIG. 1, inside the casing 11, the substrate portion 210 of the fixed scroll 200 and the substrate portion 110 of the orbiting scroll 100 are disposed to face each other. At this time, as shown in FIGS. 1 and 3, the spiral walls 220 and 120 are in mesh with each other. That is, the wall (teeth) of the spiral wall 220 is in between adjacent walls (teeth) of the spiral wall 120.

  The revolving motion of the orbiting scroll 100 and the compression of the refrigerant due to this will be described with reference to FIG. In FIGS. 3A to 3D, the state in which the fixed scroll 200 and the orbiting scroll 100 are engaged with each other is illustrated in a top view. In these drawings, the illustration of the substrate portion 110 is omitted so that the positional relationship between the spiral wall 220 and the spiral wall 120 can be seen.

  When the orbiting scroll 100 revolves, the relative positional relationship between the spiral wall 220 and the spiral wall 120 gradually changes. FIG. 3 shows how such a positional relationship changes in the order of (A), (B), (C), and (D).

  During the operation of the scroll compressor 10, a part of the side surface of the spiral wall 220 and a part of the side surface of the spiral wall 120 are in contact at a plurality of locations, and a force that presses each other at the contact portion is obtained. is working. As a result, the orbiting scroll 100 and the fixed scroll 200 are divided into a plurality of spaces, and each space serves as a working chamber for compressing the refrigerant. In FIG. 3, reference numeral RM is attached to one of these working chambers. Hereinafter, the working chamber to which the reference numeral is attached is referred to as “working chamber RM”.

  3A, 3B, 3C, and 3D, the working chamber RM gradually increases as the orbiting scroll 100 revolves. The volume decreases and moves toward the center. For this reason, the refrigerant present in the working chamber RM approaches the center of the fixed scroll 200 while being gradually compressed. Eventually, the working chamber RM and the through hole 291 communicate with each other, and the compressed refrigerant is discharged from the through hole 291 to the space 14 (see FIG. 1).

  By the way, during the operation of the scroll compressor 10, a large force is applied from the high-pressure refrigerant to the substrate portions (110, 210) and the spiral walls (120, 220) of the respective scrolls. Furthermore, since the spiral wall 120 and the spiral wall 220 are in partial contact with each other so as to be pressed against each other, the force due to the contact is also applied to the spiral walls (120, 220). Therefore, stress concentration tends to occur in the portion where the substrate portion (110, 210) and the spiral wall (120, 220) are connected. Therefore, in the present embodiment, stress concentration is reduced by forming a connecting portion such as an arc shape in the portion.

  The shape of the chamfered portion will be described with reference to FIG. In FIG. 4, a cross section of a portion where the side surface of the spiral wall 120 (hereinafter referred to as “tooth side surface 122”) and the side surface of the spiral wall 220 (hereinafter referred to as “tooth side surface 222”) are in contact. Is shown enlarged. The cross section is a plane perpendicular to the main surface 211 of the substrate unit 210 included in the fixed scroll 200 and is in contact with the spiral wall 120 and the spiral wall 220 along a common normal line. It is.

  A tooth tip surface 121 parallel to the main surface 211 is formed at the tip of the spiral wall 120 of the orbiting scroll 100, that is, at the end of the fixed scroll 200. The tooth tip surface 121 is a surface perpendicular to the tooth side surface 122.

  The corner portion where the tooth side surface 122 and the tooth tip surface 121 are connected is chamfered, whereby a chamfered portion 123 is formed. The chamfered portion 123 is formed so that the radius of curvature is a uniform curved surface as a whole. In FIG. 4, a boundary portion between the tooth side surface 122 and the chamfered portion 123 is shown as “boundary portion P11”. In addition, a boundary portion between the tooth tip surface 121 and the chamfered portion 123 is indicated as “boundary portion P12”. The boundary portion P11 corresponds to a portion of the chamfered portion 123 that has the longest distance from the main surface 211. The boundary portion P12 corresponds to a portion of the chamfered portion 123 that has the smallest distance from the main surface 211.

  The tooth side surface 222 of the spiral wall 220 included in the fixed scroll 200, that is, the portion facing the tooth side surface 122 of the spiral wall 120 is a surface perpendicular to the main surface 211 of the substrate unit 210. A connecting portion 213 is formed at a corner portion where the tooth side surface 222 and the main surface 211 are connected, that is, at a portion of the root portion of the spiral wall 220 facing the chamfered portion 123. The connecting portion 213 is formed so that the radius of curvature is a uniform curved surface as a whole. However, the curvature radius of the connecting portion 213 is larger than the curvature radius of the chamfered portion 123.

  In FIG. 4, a boundary portion between the tooth side surface 222 and the connecting portion 213 is shown as “boundary portion P <b> 21”. Further, a boundary portion between the main surface 211 and the connecting portion 213 is shown as “boundary portion P22”. The boundary portion P21 corresponds to a portion of the connecting portion 213 that has the smallest distance from the main surface 111 (not shown in FIG. 4). The boundary portion P22 corresponds to a portion of the connecting portion 213 that has the longest distance from the main surface 111.

  In the present embodiment, as described above, the curvature radius of the connecting portion 213 is larger than the curvature radius of the chamfered portion 123. Here, when the direction perpendicular to the main surface 211 that is the tooth bottom surface (vertical direction in FIG. 4) is referred to as “stretch direction”, the dimension L1 of the chamfered portion 123 along the stretch direction is the stretch It is smaller than the dimension L2 of the connecting portion 213 along the direction. In the present embodiment, the dimension L1 is equal to the radius of curvature of the connecting portion 123. The dimension L2 is equal to the radius of curvature of the connecting portion 213.

  In the present embodiment, during the operation of the scroll compressor 10, the movement along the vertical direction of the orbiting scroll 100 is restricted so that the distance between the tooth tip surface 121 and the main surface 211 becomes a predetermined thrust distance δt. ing. The thrust distance δt is maintained by the surrounding structure mechanically constraining the orbiting scroll 100 that is about to move upward (on the opposite side of the fixed scroll 200) under the pressure of the refrigerant. The thrust distance δt is designed in advance so that it can sufficiently suppress the occurrence of staking or sliding heat generation between the orbiting scroll 100 and the fixed scroll 200. That is, the thrust distance δt is set as the minimum gap size necessary for the scroll compressor 10 to operate stably.

  For this reason, in the gap formed between the orbiting scroll 100 and the fixed scroll 200, the portion on the main surface 211 side of the plane including the tooth tip surface 121 (the portion below the dotted line DL in FIG. 4). It can be said that the gap CL formed in is a minimum gap that must be generated as a result of securing the thrust distance δt. On the other hand, the gap SL formed in the portion closer to the main surface 111 than the plane including the tooth tip surface 121 (the portion above the dotted line DL in FIG. 4) formed the chamfered portion 123 on the tooth tip side. It can be said that the additional gap increased.

  In the present embodiment, since the chamfered portion 123 and the like are formed so that the dimension L1 is smaller than the dimension L2, the gap SL corresponding to the increase as described above is very narrow. Since the gap formed between the orbiting scroll 100 and the fixed scroll 200 is suppressed to a size that should be secured as a minimum as a thrust gap, refrigerant leakage during the operation of the scroll compressor 10 is sufficiently suppressed. It is possible to do.

  In the present embodiment, the distance from the boundary portion P11 to the boundary portion P21 along the extending direction is 0 mm. In other words, the boundary portion P11 that is the boundary between the tooth side surface 122 and the chamfered portion 123 is brought closer to the position closest to the main surface 211 side (that is, the boundary portion P21) in a range where interference between members does not occur. . As a result, the increased gap SL is kept as small as possible.

  When the radius of curvature of the chamfered portion 123 is equal to or greater than the radius of curvature of the connecting portion 213 as in the prior art, the distance from the boundary portion P11 to the boundary portion P21 is at least the thrust distance δt or more. The thrust distance δt is assured to be 0.01 mm even in the smallest case. Accordingly, in the conventional structure, the distance from the boundary portion P11 to the boundary portion P21 exceeds 0.01.

  On the other hand, in this embodiment, since the dimension L1 is made smaller than the dimension L2, the distance from the boundary part P11 to the boundary part P21 can be suppressed to 0.01 mm or less as described above. In this embodiment, the distance from the boundary portion P11 to the boundary portion P21 during operation is set to 0 mm. However, in consideration of the machining tolerance of components, the distance is in the range of 0 mm to 0.01 mm. It may be set arbitrarily.

  A scroll type compressor 10A according to a second embodiment of the present invention will be described with reference to FIG. The scroll compressor 10A is different from the first embodiment in the shape of the corner portion where the tooth side surface 122 and the tooth tip surface 121 are connected to each other in the spiral wall 120A, and other configurations are the same as those in the first embodiment. is there. Therefore, only the parts different from the first embodiment will be described below, and the description of the common parts will be omitted as appropriate.

  FIG. 5 shows an enlarged cross section of a portion where the tooth side surface 122 of the spiral wall 120A and the tooth side surface 222 of the spiral wall 220 are in contact with each other. The cross section is a plane perpendicular to the main surface 211 of the substrate unit 210 included in the fixed scroll 200 and in contact with the spiral wall 120A and the spiral wall 220 along a common normal line. It is. That is, the cross section shown in FIG. 5 is the same as the cross section shown in FIG.

  Also in this embodiment, a curved chamfered portion 123 </ b> A is formed at a corner portion where the tooth side surface 122 and the tooth tip surface 121 are connected. However, the radius of curvature of the chamfered portion 123A is the same as the radius of curvature of the connecting portion 213. The tooth side surface 122 and the chamfered portion 123A are smoothly connected, while the tooth tip surface 121 and the chamfered portion 123A are not smoothly connected.

  The shape of the chamfered portion 123A and the vicinity thereof will be described with reference to FIG. FIG. 6A shows the shape of the chamfered portion 123A and the vicinity thereof when the spiral wall 120A is formed so that the tooth tip surface 121 and the chamfered portion 123A are smoothly connected. Hereinafter, the spiral wall having such a shape is referred to as a “spiral wall 1200A”. Further, the tooth tip surface of the spiral wall 1200A is referred to as “tooth tip surface 1210A”.

  As already described, the curvature radius of the chamfered portion 123 </ b> A is the same as the curvature radius of the connecting portion 213. Accordingly, the surface shape of the chamfered portion 123A of the spiral wall 1200A is the same as the shape of the connecting portion 213 on the fixed scroll 200 side.

  In FIG. 6A, the surface shape of the corner portion defined by the tooth side surface 122, the chamfered portion 123A, and the tooth tip surface 1210A is the same as the surface shape of the corner portion of the fixed scroll 200 facing this. . That is, it is the same as the surface shape of the corner portion defined by the tooth side surface 222, the connecting portion 213, and the main surface 211.

  In FIG. 6A, the boundary portion between the tooth side surface 122 and the chamfered portion 123A is shown as “boundary portion P11”. Further, a boundary portion between the tooth tip surface 1210A and the chamfered portion 123A is shown as a “boundary portion P120”. The boundary portion P120 is a portion overlapping the boundary portion P22 of the fixed scroll 200.

The shape of the chamfered portion 123A of the spiral wall 120A shown in FIG. 5 is such that after the spiral wall is formed like the spiral wall 1200A shown in FIG. 6 (A), its tip portion is cut along the cut surface VS and removed. It can be said that it is an equivalent shape when formed. Needless to say, the “equivalent shape” herein includes completely the same shape. Further, even if there is a difference in shape that does not cause a difference in refrigerant pressure distribution during the operation of the scroll compressor 10, it is included in the “equivalent shape” here.
The cut surface VS is a virtual plane that is parallel to the main surface 211 and the tooth tip surface 1210A and has a predetermined offset distance δf at a distance to the tooth tip surface 1210A. In the present embodiment, the offset distance δf is equal to the thrust distance δt. FIG. 6B shows the shape of the spiral wall 1200A after the portion on the tip side (lower side in FIG. 6) from the cut surface VS is removed, that is, the shape of the chamfered portion 123A of the spiral wall 120A. Yes. In the spiral wall 120A, a boundary portion P12 that is a boundary portion between the chamfered portion 123A and the tooth tip surface 121 is a portion where the chamfered portion 123A and the cut surface VS intersect each other in FIG.

  In addition, the above description is only for demonstrating the shape of 120 A of spiral walls, and does not demonstrate the manufacturing method of 120 A of spiral walls. That is, in forming the spiral wall 120A shown in FIG. 5, it is not necessary to prepare the spiral wall 1200A shown in FIG. The chamfered portion 123A of the spiral wall 120A is, for example, in a state where the same end mill as that used when forming the chamfered portion 123A of FIG. 6A is offset by the offset distance δf toward the main surface 211 side. It can be formed by processing.

  Returning to FIG. In the present embodiment, the spiral wall 120A has the shape as described above, so that the dimension L1 of the chamfered portion 123A along the extending direction is smaller than the dimension L2 of the connecting portion 213 along the extending direction. Yes.

  Also in this embodiment, during the operation of the scroll compressor 10A, the movement along the vertical direction of the orbiting scroll 100A is restricted so that the distance between the tooth tip surface 121 and the main surface 211 becomes a predetermined thrust distance δt. ing.

  As already described, in this embodiment, the offset distance δf is equal to the thrust distance δt. For this reason, during the operation of the scroll compressor 10A, the distance from the boundary portion P11 to the boundary portion P21 along the extending direction is 0 mm. Further, the entire chamfered portion 123 </ b> A is in contact with the connecting portion 213. As a result, an increased gap SL is not formed in a portion closer to the main surface 111 than the plane including the tooth tip surface 121 (in FIG. 5, a portion above the dotted line DL). Thus, in the present embodiment, the gap formed between the orbiting scroll 100 and the fixed scroll 200 does not exceed the minimum size that should be secured as the thrust gap, so that the scroll compressor 10A is in operation. It is possible to sufficiently suppress the leakage of the refrigerant.

  When the curvature radius of the chamfered portion 123A is equal to or larger than the curvature radius of the connecting portion 213 and the offset distance δf is 0 mm as in the conventional case, the distance from the boundary portion P11 to the boundary portion P21 is At least the thrust distance δt is exceeded. The thrust distance δt is assured to be 0.01 mm even in the smallest case. Accordingly, in the conventional structure, the distance from the boundary portion P11 to the boundary portion P21 exceeds 0.01.

  On the other hand, in the present embodiment, the chamfered portion 123A is formed in a shape such that the offset distance δf (see FIG. 6A) is larger than 0 mm, so that the boundary portion P11 is separated as described above. The distance to the boundary part P21 is suppressed to 0.01 mm or less. In this embodiment, the distance from the boundary portion P11 to the boundary portion P21 during operation is set to 0 mm. However, in consideration of the machining tolerance of components, the distance is in the range of 0 mm to 0.01 mm. It may be set arbitrarily. That is, the difference between the thrust distance δt and the offset distance δf may be arbitrarily set within a range of 0 mm to 0.01 mm.

  A scroll compressor 10B according to a third embodiment of the present invention will be described with reference to FIG. The scroll compressor 10B has a shape of a corner portion where the tooth side surface 122 and the tooth tip surface 121 are connected in the spiral wall 120B, and a shape of a corner portion where the tooth side surface 222 and the main surface 211 are connected in the spiral wall 220B, However, it differs from 1st Embodiment, About another structure, it is the same as 1st Embodiment. Therefore, only the parts different from the first embodiment will be described below, and the description of the common parts will be omitted as appropriate.

  FIG. 7 shows an enlarged cross-sectional view of a portion where the tooth side surface 122 of the spiral wall 120B and the tooth side surface 222 of the spiral wall 220B are in contact with each other. The cross section is a plane perpendicular to the main surface 211 of the substrate unit 210 included in the fixed scroll 200 and in contact with the spiral wall 120B and the spiral wall 220B along a common normal line. It is. That is, the cross section shown in FIG. 7 is the same as the cross section shown in FIG.

  First, the shape of the spiral wall 220B will be described. A connecting portion 213B is formed at a corner portion of the spiral wall 220B where the tooth side surface 222 and the main surface 211 are connected. The connecting portion 213B includes a straight portion 2131B, a curved portion 2132B, and a straight portion 2133B.

  The straight line portion 2131B is the portion closest to the tooth side surface 222 of the connecting portion 213B. The straight line portion 2131B is formed as a surface having a straight shape in the cross section of FIG. The straight portion 2131B extends from the boundary portion P211 that is the boundary between the tooth side surface 222 and the connecting portion 213B toward the spiral wall 120B side (right side in FIG. 7) and the main surface 211 side (lower side in FIG. 7). It is a surface.

  The curved portion 2132B is a portion of the connecting portion 213B that is closer to the main surface 211 than the straight portion 2131B and closer to the main surface 111 (upper side in FIG. 7) than the straight portion 2133B described later. The curved portion 2132B is formed as a surface having a circular arc shape in the cross section of FIG. The curved portion 2132B is formed so that the radius of curvature is a uniform curved surface as a whole.

  In FIG. 7, a boundary portion between the straight line portion 2131B and the curved portion 2132B is shown as “boundary portion P212”. In the boundary portion P212, the straight portion 2131B and the curved portion 2132B are smoothly connected. That is, the cross-sectional shape of the straight line portion 2131B in FIG. 7 is a shape along the tangent line of the curved portion 2132B in the boundary portion P212.

  The straight line portion 2133B is the portion closest to the main surface 211 in the connecting portion 213B. The straight portion 2133B is formed as a surface having a straight shape in the cross section of FIG. The straight line portion 2133B extends from the boundary portion P214, which is the boundary between the main surface 211 and the connecting portion 213B, toward the tooth side surface 222 side (left side in FIG. 7) and the main surface 111 side (upper side in FIG. 7). It is a surface.

  In FIG. 7, a boundary portion between the curved portion 2132B and the straight line portion 2133B is shown as “boundary portion P213”. In the boundary portion P213, the curved portion 2132B and the straight portion 2133B are smoothly connected. That is, the cross-sectional shape of the straight line portion 2133B in FIG. 7 is a shape along the tangent line of the curved portion 2132B in the boundary portion P213. As described above, the connecting portion 213B in the present embodiment has such a shape that the straight portions 2131B and 2133B having a linear cross-sectional shape are provided on both sides of the curved portion 2132B.

  Next, the shape of the spiral wall 120B will be described. A chamfered portion 123B is formed at a corner portion of the spiral wall 120B where the tooth side surface 122 and the tooth tip surface 121 are connected. The chamfered portion 123B has a straight portion 1231B, a curved portion 1232B, and a straight portion 1233B.

  The straight portion 1231B is the portion closest to the tooth side surface 122 in the chamfered portion 123B. The straight portion 1231B is formed as a surface having a straight shape in the cross section of FIG. The straight portion 1231B is directed from the boundary portion P111, which is the boundary between the tooth side surface 122 and the chamfered portion 123B, to the side opposite to the spiral wall 220B (right side in FIG. 7) and the main surface 211 side (lower side in FIG. 7). It is a surface that extends. The length of the straight portion 1231B is equal to the length of the straight portion 2131B. Further, the inclination angle of the straight portion 1231B with respect to the tooth side surface 122 is equal to the inclination angle of the straight portion 2131B with respect to the tooth side surface 222.

  The curved portion 1232B is a portion of the chamfered portion 123B that is closer to the main surface 211 than the straight portion 1231B and closer to the main surface 111 (upper side in FIG. 7) than the straight portion 1233B described later. The curved portion 1232B is formed as a surface having a circular arc shape in the cross section of FIG. The curved portion 1232B is formed so that the radius of curvature is a uniform curved surface as a whole. The arc length and the radius of curvature of the curved portion 1232B are equal to the arc length and the radius of curvature of the curved portion 2132B.

  In FIG. 7, the boundary portion between the straight line portion 1231B and the curved portion 1232B is shown as “boundary portion P112”. In the boundary part P112, the straight line part 1231B and the curved line part 1232B are smoothly connected. That is, the cross-sectional shape of the straight portion 1231B in FIG. 7 is a shape along the tangent line of the curved portion 1232B in the boundary portion P112.

  The straight line portion 1233B is a portion closest to the main surface 211 in the chamfered portion 123B. The straight portion 1233B is formed as a surface whose shape in the cross section of FIG. The straight portion 1233B extends from the boundary portion P114, which is a boundary between the tooth tip surface 121 and the chamfered portion 123B, toward the tooth side surface 122 side (left side in FIG. 7) and the main surface 111 side (upper side in FIG. 7). It is a serious aspect. The inclination angle of the straight line portion 1233B with respect to the addendum surface 121 is equal to the inclination angle of the straight line portion 2133B with respect to the main surface 211. However, the length of the straight portion 1233B in the cross section shown in FIG. 7 is shorter than the length of the straight portion 2133B.

  In FIG. 7, the boundary portion between the curved portion 1232B and the straight portion 1233B is shown as “boundary portion P113”. In the boundary portion P113, the curved portion 1232B and the straight portion 1233B are smoothly connected. That is, the cross-sectional shape of the straight portion 1233B in FIG. 7 is a shape along the tangent line of the curved portion 1232B in the boundary portion P113. As described above, the chamfered portion 123B according to the present embodiment has such a shape that the straight portions 1231B and 1233B whose cross-sectional shapes are linear are provided on both sides of the curved portion 1232B.

  The shape of the chamfered portion 123B and the vicinity thereof will be described with reference to FIG. FIG. 8A shows the shape of the chamfered portion 123B and the vicinity thereof when the shape of the straight portion 1233B in the cross section is formed to be the same as the shape of the straight portion 2133B. Hereinafter, the spiral wall having such a shape is referred to as a “swirl wall 1200B”. Further, the tooth tip surface of the spiral wall 1200B is referred to as “tooth tip surface 1210B”. In FIG. 8, the boundary portion between the straight line portion 1233B and the tooth tip surface 1210B is shown as “boundary portion P1140”. The boundary portion P1140 is a portion that overlaps the boundary portion P214 of the fixed scroll 200B.

  In FIG. 8A, the surface shape of the corner portion defined by the tooth side surface 122, the chamfered portion 123B, and the tooth tip surface 1210B is the same as the surface shape of the corner portion of the fixed scroll 200B facing this. . That is, it is the same as the surface shape of the corner portion defined by the tooth side surface 222, the connecting portion 213B, and the main surface 211.

  The chamfered portion 123B of the spiral wall 120B shown in FIG. 7 is formed when the spiral wall is formed like the spiral wall 1200B shown in FIG. 8A, and then the tip portion is cut and removed along the cutting plane VS. It can be said that it is a shape equivalent to the shape formed in this. Needless to say, the “equivalent shape” herein includes completely the same shape. The cut surface VS is a virtual plane that is parallel to the main surface 211 and the tooth tip surface 1210B, and whose distance to the tooth tip surface 1210B is a predetermined offset distance δf. In the present embodiment, the offset distance δf is equal to the thrust distance δt. FIG. 8B shows the shape after the portion of the spiral wall 1200B on the tip side (lower side in FIG. 8) from the cut surface VS is removed, that is, the shape of the chamfered portion 123B of the spiral wall 120B. Yes. Of the spiral wall 120B, a boundary portion P114 that is a boundary portion between the chamfered portion 123B and the tooth tip surface 121 is a portion where the chamfered portion 123B (straight line portion 1233B) and the cut surface VS intersect in FIG. It is.

  In addition, the above description is only for demonstrating the shape of the spiral wall 120B, and does not demonstrate the manufacturing method of the spiral wall 120B. That is, in forming the spiral wall 120B shown in FIG. 7, it is not necessary to prepare the spiral wall 1200B shown in FIG. 8A in advance. The chamfered portion 123B of the spiral wall 120B is, for example, in a state where the same end mill used when forming the chamfered portion 123B of FIG. 8A is offset by the offset distance δf toward the main surface 211 side. It can be formed by processing.

  Returning to FIG. 7, the description will be continued. In the present embodiment, since the spiral wall 120B has the shape as described above, the dimension L1 of the chamfered portion 123B along the extending direction is smaller than the dimension L2 of the connecting portion 213 along the extending direction. Yes.

  Also in this embodiment, during the operation of the scroll compressor 10B, the movement along the vertical direction of the orbiting scroll 100B is restricted so that the distance between the tooth tip surface 121 and the main surface 211 becomes a predetermined thrust distance δt. ing.

  As already described, in this embodiment, the offset distance δf is equal to the thrust distance δt. For this reason, during the operation of the scroll compressor 10B, the distance from the boundary P111 to the boundary P211 along the extending direction is 0 mm. Further, the entire chamfered portion 123B is in contact with the connecting portion 213B.

  As a result, an increased gap SL is not formed in a portion on the main surface 111 side of the plane including the tooth tip surface 121 (a portion on the upper side of the dotted line DL in FIG. 7). Thus, in the present embodiment, the gap formed between the orbiting scroll 100B and the fixed scroll 200B does not exceed the minimum size that should be secured as the thrust gap, so that the scroll compressor 10B is in operation. It is possible to sufficiently suppress the leakage of the refrigerant.

  In the present embodiment, since the chamfered portion 123B is formed in a shape such that the offset distance δf (see FIG. 8A) is greater than 0 mm, the distance from the boundary P111 to the boundary P211 is 0. .01 mm or less. In this embodiment, the distance from the boundary portion P111 to the boundary portion P211 during operation is set to 0 mm. However, in consideration of the machining tolerance of components, the distance is in the range of 0 mm to 0.01 mm. It may be set arbitrarily. That is, the difference between the thrust distance δt and the offset distance δf may be arbitrarily set within a range of 0 mm to 0.01 mm.

  The chamfered portion 123B in the present embodiment is shaped to have straight portions 1231B and 1233B whose cross-sectional shapes are linear on both sides of the curved portion 1232B. For this reason, the position of the boundary portion P111 and the boundary portion P114 can be changed in proportion to the offset amount of the processing blade, and the offset amount of the processing blade can be easily set with respect to the position of the target boundary portion. Can be suppressed. As a result, it is possible to perform the processing with high accuracy so that the positions of the boundary portion P111 and the boundary portion P114 are as designed as compared with the case where the entire cross-sectional shape of the chamfered portion 123B is curved. It has become.

  A scroll type compressor 10C according to a fourth embodiment of the present invention will be described with reference to FIG. In the scroll compressor 10C, the tip seal 300 extends along the tooth tip surface 121 that is the tip surface of the spiral wall 120C. The scroll compressor 10C is different from the first embodiment in this point, and the other configuration is the same as that of the first embodiment. Therefore, only the parts different from the first embodiment will be described below, and the description of the common parts will be omitted as appropriate.

  As shown in FIG. 9, a groove 125 having a rectangular cross section is formed on the tooth tip surface 121. The groove 125 is a groove for accommodating the chip seal 300 therein, and is formed in a spiral shape along the tooth tip surface 121.

  The tip seal 300 is a member formed in a spiral shape along the groove 125. In this embodiment, the chip seal 300 is formed of a material containing polyether ether ketone. The material of the chip seal 300 may be a material containing other resin such as polyphenylene sulfide.

  During the operation of the scroll compressor 10C, the tip seal 300 receives force from the high-pressure refrigerant. As a result, the tip seal 300 is pressed against the inner surface of the groove 125 and the main surface 211. As a result, the refrigerant is prevented from leaking beyond the tip seal 300.

  However, when using the resinous chip seal as described above, the metal chip seal has a drawback that it is excellent in sealing performance but inferior in heat resistance. In particular, when the tip of the spiral wall and the substrate slide in contact with each other due to factors such as thermal expansion, there is a concern that the chip seal may be melted due to sliding heat generation, and it is necessary to provide a sufficient gap as a countermeasure. In that case, it is preferable to combine with each embodiment of the present invention in order to minimize the leakage gap and suppress the deterioration of the performance.

  Further, in a cycle using a refrigerant such as carbon dioxide in which the difference between the low pressure side and the high pressure side is large at the time of operation and the amount of leakage from the gap increases, it is preferable to combine with each embodiment of the present invention. .

  In the above description, the shape of the connecting portion on the base side of the spiral wall 220 included in the fixed scroll 200 and the shape of the chamfered portion on the tip side of the spiral wall 120 included in the orbiting scroll 100 have been described. Of course, instead of or in addition to such a mode, the chamfered shape similar to that described above for the tip side of the spiral wall 220 and the root side of the spiral wall 120 is used. Moreover, you may give the process which makes a connection shape.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. That is, those specific examples modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. For example, the elements included in each of the specific examples described above and their arrangement, materials, conditions, shapes, sizes, and the like are not limited to those illustrated, and can be changed as appropriate. Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

10, 10A, 10B, 10C: Scroll compressor 11: Casing 100, 100A, 100B: Orbiting scroll 200, 200B: Fixed scroll 110, 210: Substrate 120, 120A, 120B, 120C, 220, 220B: Swirl wall 121 : Tooth surface 122, 222: tooth side surface 111, 211: main surface 123, 123A, 123B: chamfered portion 213, 213B: connecting portion

Claims (9)

A scroll compressor (10) for compressing fluid,
A fixed scroll (200) fixed inside the casing (11), and a turning scroll (100) turning inside the casing,
The fixed scroll and the orbiting scroll each have a flat plate-like substrate portion (110, 210), a spiral spiral wall (120, 220) extending perpendicularly from the main surface (111, 211) of the substrate portion, Have
The substrate portion of the fixed scroll and the substrate portion of the orbiting scroll are disposed to face each other so that the respective spiral walls are engaged with each other.
The first scroll, which is one of the fixed scroll and the orbiting scroll,
A first tooth side surface (122) which is a side surface of the spiral wall;
A tooth tip surface (121) which is a surface formed at a tip of the spiral wall and is a surface perpendicular to the first tooth side surface;
A chamfered portion (123) is formed at a portion where the first tooth side surface and the tooth tip surface are connected,
The second scroll, which is the other of the fixed scroll and the orbiting scroll,
A second tooth side surface (222) which is a side surface of the spiral wall;
A bottom surface (211) that is a main surface of the substrate portion and is a surface perpendicular to the second tooth side surface;
A connecting portion (213) is formed in a portion where the second tooth side surface and the tooth bottom surface are connected to each other and a portion facing the chamfered portion,
When the direction perpendicular to the root surface is the extending direction,
The first dimension (L1), which is the dimension of the chamfered portion along the extending direction,
Said to be smaller than the second dimension is the dimension of the connecting portion along the extending direction (L2), the chamfered portion and the front tight Nagi portion are formed respectively,
The shape of the chamfered portion formed on the spiral wall of the first scroll is:
Formed when the tip shape of the chamfered portion is cut along a cutting surface (VS) parallel to the tooth bottom surface from the state where the surface shape of the chamfered portion is the same as the surface shape of the joint portion. It has the same shape as the shape
In a cross section perpendicular to the root surface,
Each of the chamfered portion and the connecting portion includes a scroll portion (123, 213, 123A, 1232B, 2132B) whose cross-sectional shape is an arc shape at least in part . A boundary portion between the first tooth side surface and the chamfered portion is a first boundary portion (P11),
When the boundary portion between the second tooth side surface and the connecting portion is the second boundary portion (P21),
The distance from the first boundary portion to the second boundary portion along the extending direction is 0.01 mm or less at a position where the spiral walls are in contact with each other during operation of the scroll compressor. Item 2. The scroll compressor according to Item 1. In a cross section perpendicular to the root surface,
The chamfered portion and the connecting portion are both linear portions sectional shape is linear (1231B, 1233B, 2131B, 2133B ) , and has on both sides of the curved portion of claim 1 Scroll type compressor. In a cross section perpendicular to the root surface,
The scroll compressor according to claim 3 , wherein a cross-sectional shape of the straight portion is a tangent to the curved portion at a boundary portion between the straight portion and the curved portion. During operation of the scroll compressor, the distance between the tooth tip surface and the tooth bottom surface is configured to be a predetermined thrust distance,
Between the tooth tip surface when the first scroll is formed so that the surface shape of the chamfered portion is the same as the surface shape of the connecting portion, and the tooth tip surface of the actual first scroll. Is the offset distance,
The scroll compressor according to claim 1 , wherein a difference between the thrust distance and the offset distance is 0.01 mm or less. The scroll compressor according to any one of claims 1 to 5 , wherein a tip seal (300) extends along the tooth tip surface. The scroll compressor according to claim 6 , wherein the tip seal is made of a material containing resin. The scroll compressor according to claim 7 , wherein the resin includes either polyetheretherketone or polyphenylene sulfide. The scroll compressor according to any one of claims 1 to 8 , wherein the fluid is carbon dioxide.

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