Rotary compressor and refrigeration device

Abstract

This rotary compressor comprises: a shaft that extends in a first direction; a motor that drives the shaft; a first bearing supporting the shaft and having a discharge hole through which a compressed refrigerant is discharged; a cylinder inside which a cylinder chamber is formed; a roller that is fixed to the shaft and eccentrically rotates in the cylinder chamber; and a muffler disposed to cover the discharge hole. The motor, the muffler, the first bearing, and the cylinder are arranged in order along the first direction. The first bearing has a boss part that supports the shaft and protrudes to the muffler side. The muffler has an opening through which the boss part passes. The first bearing or the muffler has a positioning structure that fixes the position of the muffler relative to the first bearing such that a gap with respect to the opening exists throughout the outer circumferential periphery of the boss part.

Description

Rotary Compressor and Refrigeration Device

[0001] The present disclosure relates to a rotary compressor and a refrigeration device including the same. A rotary compressor is a compressor that compresses gas in a compression chamber formed in a cylinder by eccentrically rotating a roller in the cylinder. A rotary compressor generally has a vane for partitioning the compression chamber. The rotary compressor includes a so-called rolling piston type in which a vane separate from the roller abuts against the roller while the roller eccentrically rotates, a so-called swing type in which a vane integrally formed with the roller swings as the roller eccentrically rotates, a so-called hinge vane type in which the tip of the vane is rotatably fitted in a recess on the outer peripheral surface of the roller and the roller eccentrically rotates, and the like.

[0002] Patent Document 1 discloses a compressor including a front head member and a muffler member. Patent Document 1 discloses that the front head member in the compressor has a disk portion in which a front head discharge hole through which compressed refrigerant is discharged is formed, and a cylindrical boss portion extending from the periphery of the front head opening provided in the disk portion. Patent Document 1 discloses that the muffler member in the compressor is disposed outside the front head discharge hole and forms a muffler space together with the front head member. Patent Document 1 discloses that it has a muffler opening through which the cylindrical boss portion passes, and in a state where the cylindrical boss portion passes through the muffler opening, it is in close contact at at least two positions on the outer peripheral surface of the cylindrical boss portion.

[0003] Japanese Patent Application Laid-Open No. 2012-021407

[0004] However, noise is generated due to variations in the gap between the cylindrical boss portion and the muffler opening.

[0005] The present disclosure provides a compressor that suppresses variations in the gap between the muffler and the bearing with respect to a bearing having a discharge hole, and suppresses the generation of noise.

[0006] A rotary compressor in the first view comprises: a shaft extending in a first direction; a motor that drives the shaft; a first bearing that supports the shaft and has a discharge hole through which compressed refrigerant is discharged; a cylinder that forms a cylinder chamber inside; a roller fixed to the shaft and rotating eccentrically in the cylinder chamber; and a muffler positioned to cover the discharge hole, wherein the motor, the muffler, the first bearing, and the cylinder are arranged in order along the first direction; the first bearing has a boss portion that supports the shaft and protrudes toward the muffler; the muffler has an opening through which the boss portion passes; and the first bearing or the muffler has a positioning structure that determines the position of the muffler relative to the first bearing such that there is a gap between the muffler and the opening around the entire circumference in the outer direction of the boss portion.

[0007] According to the rotary compressor of the first viewpoint, noise generation can be suppressed by positioning the muffler relative to the first bearing such that it has an opening and a gap.

[0008] The rotary compressor according to the second view is a rotary compressor according to the first view, wherein the first bearing has a first hole into which a bolt is inserted, the muffler has a second hole into which the bolt is inserted, and a projection that protrudes from the periphery of the second hole toward the first bearing, the positioning structure is the projection, and the projection is positioned between the bolt and the first hole.

[0009] According to the rotary compressor of the second perspective, the position of the muffler relative to the first bearing can be determined such that it has an opening and a gap by attaching the muffler with bolts.

[0010] The rotary compressor of the third aspect is the rotary compressor of the first aspect, wherein the first bearing has a contact surface that contacts the muffler, the first bearing has a recess on the contact surface and the muffler has a protrusion on the surface facing the contact surface, or the first bearing has a protrusion on the contact surface and the muffler has a recess facing the contact surface, the positioning structure is the recess and the protrusion, and the protrusion and the recess fit together.

[0011] According to the rotary compressor of the third perspective, the position of the muffler relative to the first bearing can be determined such that there is an opening and a gap by fitting the recess and the protrusion together.

[0012] The rotary compressor in the fourth view is the rotary compressor in the third view, wherein the contact surface includes the surface of the first bearing facing the muffler.

[0013] According to the rotary compressor of the fourth perspective, the recesses and protrusions that determine the position of the muffler relative to the first bearing can be easily formed.

[0014] The rotary compressor of the fifth viewpoint is the rotary compressor of the third viewpoint, wherein the contact surface includes the side surface of the first bearing.

[0015] According to the rotary compressor from the fifth perspective, the position of the muffler relative to the first bearing can be determined more precisely.

[0016] The rotary compressor of the sixth perspective is a rotary compressor of the first to fifth perspectives, having two or more of the positioning structures.

[0017] According to the rotary compressor of the sixth perspective, noise generation can be suppressed by positioning the muffler relative to the first bearing such that it has an opening and a gap.

[0018] The rotary compressor of the seventh aspect is the rotary compressor of the sixth aspect, wherein one of the positioning structures is provided at a position offset from the rotational symmetry of the other positioning structure.

[0019] According to the rotary compressor in the seventh perspective, the muffler can be mounted in the correct orientation relative to the first bearing.

[0020] The refrigeration system in the first perspective is a refrigeration system that includes a compressor in the seventh perspective from the first perspective.

[0021] According to the first aspect of the refrigeration system, noise generation can be suppressed by positioning the muffler relative to the first bearing such that it has an opening and a gap in the rotary compressor of the refrigeration system.

[0022] Figure 1 is a perspective view of a rotary compressor according to the first embodiment. Figure 2 is a cross-sectional view of a rotary compressor according to the first embodiment. Figure 3 is a perspective view of the upper bearing and muffler in the rotary compressor according to the first embodiment. Figure 4 is a plan view of the upper bearing and muffler in the rotary compressor according to the first embodiment. Figure 5 is a diagram illustrating the attachment of the muffler to the upper bearing in the rotary compressor according to the first embodiment. Figure 6 is a perspective view of the muffler in the rotary compressor according to the first embodiment. Figure 7 is a bottom view of the muffler in the rotary compressor according to the first embodiment. Figure 8 is a cross-sectional view of the upper bearing and muffler in the rotary compressor according to the first embodiment. Figure 9 is a perspective view of a first modified example of the muffler in the rotary compressor according to the first embodiment. Figure 10 is a perspective view of a second modified example of the muffler in the rotary compressor according to the first embodiment. Figure 11 is a perspective view of the upper bearing and muffler in the rotary compressor according to the second embodiment. Figure 12 is a perspective view of the muffler in the rotary compressor according to the second embodiment. Figure 13 is a perspective view of the upper bearing in the rotary compressor according to the third embodiment. Figure 14 is a perspective view of the muffler in a rotary compressor according to the third embodiment. Figure 15 is a schematic diagram of a refrigeration system equipped with the rotary compressor according to this embodiment.

[0023] <First Embodiment> A specific example of the rotary compressor of the first embodiment will be described below with reference to the drawings. However, this disclosure is not limited to these examples, and is intended to include all modifications within the meaning and scope of the claims, as indicated by the claims.

[0024] In addition, regarding the descriptions and drawings of each embodiment, components having substantially the same or corresponding functional configurations may be denoted by the same reference numerals, thereby omitting redundant explanations. Furthermore, for ease of understanding, the scale of each part in the drawings may differ from the actual scale.

[0025] A degree of deviation is permissible in directions such as parallel, right angles, orthogonal, horizontal, vertical, up and down, left and right, and front and back, as long as it does not impair the effects of the embodiment. The shape of the corners is not limited to right angles and may be rounded. Parallel, right angles, orthogonal, horizontal, and vertical may include approximately parallel, approximately right angles, approximately orthogonal, approximately horizontal, and approximately vertical, respectively.

[0026] For example, "approximately parallel" means that two lines or two planes can be treated as parallel to each other within a manufacturingly acceptable range, even if they are not perfectly parallel. Similarly, "approximately right angle," "approximately perpendicular," "approximately horizontal," and "approximately vertical" are intended to apply as long as the relative positions of the two lines or two planes are within a manufacturingly acceptable range.

[0027] A rotary compressor according to the first embodiment will now be described. The rotary compressor according to the first embodiment comprises a shaft extending in a first direction, a motor that drives the shaft, a first bearing that supports the shaft and has a discharge hole through which compressed refrigerant is discharged, and a cylinder that forms a cylinder chamber inside. The rotary compressor according to the first embodiment also comprises a piston fixed to the shaft and rotating eccentrically in the cylinder chamber, and a muffler that is arranged to cover the discharge hole. In the rotary compressor according to the first embodiment, the motor, muffler, first bearing, and cylinder are arranged in order along the first direction. The first bearing in the rotary compressor according to the first embodiment has a boss portion that supports the shaft and protrudes toward the muffler. The muffler in the rotary compressor according to the first embodiment has an opening through which the boss portion passes. Furthermore, in the rotary compressor according to the first embodiment, the first bearing or the muffler has a positioning structure that determines the position of the muffler relative to the first bearing such that there is a gap between the opening and the boss portion around the entire circumference in the outer direction.

[0028] In the rotary compressor according to the first embodiment, the first bearing has a first hole into which a bolt is inserted. The muffler in the rotary compressor according to the first embodiment has a second hole into which a bolt is inserted, and a projection that protrudes from the periphery of the second hole toward the first bearing. In the rotary compressor according to the first embodiment, the positioning structure is the projection, which is positioned between the bolt and the first hole.

[0029] Figure 1 is a perspective view of a rotary compressor 1, which is an example of a rotary compressor according to the first embodiment. Figure 2 is a cross-sectional view of a rotary compressor 1, which is an example of a rotary compressor according to the first embodiment.

[0030] For ease of explanation, drawings may sometimes include a virtual three-dimensional coordinate system (XYZ Cartesian coordinate system) consisting of mutually orthogonal X, Y, and Z axes (XYZ axes). For example, when a coordinate axis perpendicular to the plane of the drawing is shown with a black circle inside, it indicates that the coordinate axis is pointing towards the viewer relative to the plane of the drawing. Conversely, when a coordinate axis is shown with an X inside, it indicates that the coordinate axis is pointing away from the plane of the drawing.

[0031] However, this coordinate system is defined for illustrative purposes only and is not limited to the orientation of the rotary compressor, etc., according to this embodiment.

[0032] In the following diagram, the shaft 81 of the rotary compressor 1 extends in the direction along the Z axis, and the rollers 61 and 62 of the rotary compressor 1 rotate in a plane parallel to the XY plane, which includes the X and Y axes.

[0033] A view of an object along the Z-axis, looking from the +Z side in the opposite direction of the Z-axis, is called a plan view. A view of an object along the Z-axis, looking from the -Z side in the direction of the Z-axis, is called a bottom view. A view of an object along the Z-axis, looking from the -Z side in the direction of the Z-axis, is called a bottom view.

[0034] The rotary compressor 1 compresses a refrigerant. The refrigerant used in the rotary compressor 1 is, for example, carbon dioxide. However, the refrigerant is not limited to carbon dioxide; for example, fluorocarbon-based, hydrofluoroolefin-based, or hydrocarbon-based refrigerants may also be used. The rotary compressor 1 comprises a compressor body 10 and an accumulator 20.

[0035] [Compressor body 10] The compressor body 10 comprises a casing 11, an intake pipe 12, an exhaust pipe 13, and power terminals 15. The casing 11 also includes a plate 14 for mounting the compressor body 10.

[0036] The casing 11 is a cylindrical sealed container. The casing 11 comprises a body portion 11a, an upper end plate 11b, and a lower end plate 11c. The end of the body portion 11a is closed by the upper end plate 11b and the lower end plate 11c, respectively. The casing 11 is sealed by the body portion 11a being closed by the pair of upper end plates 11b and lower end plates 11c.

[0037] The body portion 11a has a cylindrical shape. The intake pipe 12 is attached to the lower part of the body portion 11a of the casing 11. The upper end plate 11b and the lower end plate 11c each have a dish shape. The exhaust pipe 13 is attached to the upper part of the body portion 11a of the casing 11.

[0038] The compressor body 10 includes a compression mechanism 70 and a motor 80 inside the casing 11. The motor 80 rotates the shaft 81. The compression mechanism 70 compresses the refrigerant supplied from the suction pipe 12. The refrigerant compressed in the compression mechanism 70 is discharged to the outside of the rotary compressor 1 through the exhaust pipe 13.

[0039] The motor 80 rotates the shaft 81. The shaft 81 is connected to each of the rollers 61 and 62. In the compression mechanism 70, the shaft 81 rotated by the motor 80 rotates each of the rollers 61 and 62. Each of the rollers 61 and 62 rotates eccentrically when the shaft 81 rotates. When each of the rollers 61 and 62 rotates, the refrigerant is compressed in the compression mechanism 70. When each of the rollers 61 and 62 rotates, the compression chamber is partitioned by the vanes.

[0040] The shaft 81 has a flow path inside through which lubricating oil flows. The shaft 81 has communication holes that penetrate from the internal flow path to the outside of the shaft 81 in order to supply lubricating oil to each of the lower bearing 31, the cylinders 41 and 42, and the upper bearing 32.

[0041] The shaft 81 has a main shaft portion 82, an eccentric portion 83, an intermediate connecting portion 84, an eccentric portion 86, and a sub-shaft portion 87. In the shaft 81, the main shaft portion 82, the eccentric portion 83, the intermediate connecting portion 84, the eccentric portion 86, and the sub-shaft portion 87 are integrally formed.

[0042] The main shaft portion 82 has a columnar or cylindrical shape. The upper end of the main shaft portion 82 is connected to the rotor of the motor in the motor 80. The lower end of the main shaft portion 82 is rotatably supported by the upper bearing 32. The lower end of the main shaft portion 82 constitutes a journal.

[0043] The eccentric portion 83 is a columnar portion having a larger diameter than the main shaft portion 82. The central axis of the eccentric portion 83 is eccentric from the central axis of the main shaft portion 82. The roller 62 is attached to the eccentric portion 83.

[0044] The intermediate connecting portion 84 connects the eccentric portion 83 and the eccentric portion 86.

[0045] The eccentric portion 86 is a columnar portion having a larger diameter than the main shaft portion 82. The central axis of the eccentric portion 86 is eccentric from the central axis of the main shaft portion 82. The eccentric portion 86 is eccentric on the opposite side of the eccentric portion 83 with respect to the central axis of the main shaft portion 82. The roller 61 is attached to the eccentric portion 86. The lower surface of the eccentric portion 86 slides on the upper surface of the lower bearing 31.

[0046] The sub-shaft portion 87 has a columnar or cylindrical shape. The sub-shaft portion 87 is rotatably supported by the lower bearing 31. The sub-shaft portion 87 constitutes a journal.

[0047] The compression mechanism 70 includes a lower bearing 31, a cylinder 41, a middle plate 33, a cylinder 42, an upper bearing 32, and a muffler 90. Further, the lower bearing 31, the cylinder 41, the middle plate 33, the cylinder 42, and the upper bearing 32 are stacked in order from the bottom. The muffler 90 is attached to the upper bearing 32. The compression mechanism 70 is fixed to the casing 11 at the upper bearing 32.

[0048] The upper bearing 32 is disposed on the upper part of each of the cylinders 41 and 42. The lower bearing 31 is disposed on the lower part of each of the cylinders 41 and 42. The shaft 81 penetrates each of the lower bearing 31, the cylinder 41, the middle plate 33, the cylinder 42, and the upper bearing 32. The shaft 81 has communication holes penetrating from the internal flow path to the outside of the shaft 81 in order to supply lubricating oil to each of the lower bearing 31, the cylinder 41, the cylinder 42, and the upper bearing 32.

[0049] The compression mechanism 70 includes a roller 61 that eccentrically rotates with the shaft 81 in a cylinder chamber formed inside the cylinder 41. The lower surface of the roller 61 slides on the upper surface of the lower bearing 31. Also, the upper surface of the roller 61 slides on the lower surface of the middle plate 33.

[0050] Further, the compression mechanism 70 includes a roller 62 that eccentrically rotates with the shaft 81 in a cylinder chamber formed inside the cylinder 42. The lower surface of the roller 62 slides on the upper surface of the middle plate 33. Also, the upper surface of the roller 62 slides on the lower surface of the upper bearing 32.

[0051] The attachment of the muffler 90 to the upper bearing 32 will now be described. Figure 3 is a perspective view of the upper bearing 32 and muffler 90 in a rotary compressor 1, which is an example of a rotary compressor according to the first embodiment. Figure 4 is a plan view of the upper bearing 32 and muffler 90 in a rotary compressor 1, which is an example of a rotary compressor according to the first embodiment. Figure 5 is a diagram illustrating the attachment of the muffler 90 to the upper bearing 32 in a rotary compressor 1, which is an example of a rotary compressor according to the first embodiment.

[0052] The muffler 90 is attached to the upper part of the upper bearing 32. The muffler 90 is attached to the upper bearing 32 by a number of bolts 95.

[0053] The upper bearing 32 has a main body portion 32a, an outer peripheral wall portion 32b, and a main bearing portion 32c. The upper bearing 32 is formed by integrally molding the main body portion 32a, the outer peripheral wall portion 32b, and the main bearing portion 32c.

[0054] The main body portion 32a has a disc shape. The main body portion 32a is positioned above and adjacent to the cylinder 42. The main body portion 32a is positioned to cover the upper end face of the cylinder 42. The lower surface of the main body portion 32a is in close contact with the cylinder 42. The main body portion 32a has a through hole 32h through which a bolt 95 passes. The main body portion 32a has a discharge hole 32d through which compressed refrigerant is discharged. The main body portion 32a has an upper surface 32S on which the muffler 90 is mounted.

[0055] The outer peripheral wall portion 32b has a thick, annular shape at the outer peripheral edge of the main body portion 32a. The outer peripheral wall portion 32b is fixed to the body portion 11a of the casing 11.

[0056] The main bearing portion 32c is provided protruding upward from the main body portion 32a. The main bearing portion 32c has a cylindrical shape. The main bearing portion 32c rotatably supports the shaft 81. The main bearing portion 32c constitutes a radial bearing.

[0057] The muffler 90 will now be described. Figure 6 is a perspective view of the muffler 90 in a rotary compressor 1, which is an example of a rotary compressor according to the first embodiment. Figure 7 is a bottom view of the muffler 90 in a rotary compressor 1, which is an example of a rotary compressor according to the first embodiment.

[0058] The muffler 90 is positioned to cover the discharge hole 32d in the upper bearing 32. By covering the discharge hole 32d, the muffler 90 suppresses the generation of noise caused by the refrigerant discharged from the discharge hole 32d.

[0059] The muffler 90 has an opening 91 through which the main bearing portion 32c of the upper bearing 32 passes. The muffler 90 has a discharge port 92 through which the refrigerant discharged from the discharge port 32d is discharged. When viewed from above, the discharge port 92 is offset by 90 degrees from the discharge port 32d, with respect to the center of the opening 91.

[0060] The muffler 90 has a through hole 93 through which a bolt 95 passes. The muffler 90 has a protruding portion 93p that extends from the periphery of the through hole 93 toward the upper bearing 32. The protruding portion 93p protrudes from the lower surface 90S of the muffler 90, which is opposite the upper surface 32S.

[0061] The projection 93p indicated by arrow A is located at a position that is offset from the axial rotational symmetry of the other projections 93p.

[0062] The positioning of the muffler 90 using the protruding portion 93p will now be described. Figure 8 is a cross-sectional view of the upper bearing 32 and muffler 90 in a rotary compressor 1, which is an example of a rotary compressor according to the first embodiment. Specifically, Figure 8 is a cross-sectional view taken along line I-I in Figure 4.

[0063] The protruding portion 93p is fitted into the through hole 32h in the upper bearing 32. The protruding portion 93p is positioned between the bolt 95 and the wall surface forming the through hole 32h. By fitting the protruding portion 93p into the through hole 32h, the upper bearing 32 and the muffler 90 are aligned. By aligning and mounting the muffler 90 to the upper bearing 32, the muffler 90 is mounted so that it has a gap d between the opening 91 and the upper bearing 32 around its entire circumference in the outer direction. In other words, the protruding portion 93p becomes a positioning structure that determines the position of the muffler 90 relative to the upper bearing 32.

[0064] According to the rotary compressor of the first embodiment, the muffler has a protruding portion that extends from the periphery of the second hole into which the bolt is inserted toward the first bearing, thereby allowing the muffler to be positioned relative to the first bearing such that it has a gap with the muffler opening.

[0065] A modified version of the rotary compressor according to the first embodiment will now be described. Figure 9 is a perspective view of muffler 190, which is a first modified version of the muffler in the rotary compressor according to the first embodiment. Figure 10 is a perspective view of muffler 290, which is a first modified version of the muffler in the rotary compressor according to the first embodiment.

[0066] The muffler 90 has protrusions 93p in all of the through holes 93 through which the bolts 95 pass, but it is sufficient if at least two of the through holes 93 have protrusions 93p. In other words, the rotary compressor according to the first embodiment only needs to have two or more positioning structures. The same applies to the following embodiments. The muffler 190 has two through holes 193 with protrusions 193p formed thereon, and two through holes 194 without protrusions formed thereon. The muffler 290 also has two through holes 293 with protrusions 293p formed thereon, and two through holes 294 without protrusions formed thereon.

[0067] Muffler 190 and muffler 290 differ in the through-holes in which the protrusions are formed. In muffler 290, protrusions are formed in the through-holes in muffler 190 where no protrusions are formed.

[0068] In the examples of muffler 190 and muffler 290, protrusions are formed between opposing through holes, but protrusions may also be formed between adjacent through holes. Furthermore, the muffler according to this embodiment may have protrusions in all three through holes.

[0069] The upper bearing 32 is an example of the first bearing, the through hole 32h is an example of the first hole, the through hole 93 is an example of the second hole, and the main bearing portion 32c is an example of the boss portion.

[0070] <Second Embodiment> A rotary compressor according to the second embodiment will now be described. In the rotary compressor according to the first embodiment, the positioning structure was a protruding part, but in the rotary compressor according to the second embodiment, the positioning structure is a recessed part and a convex part that fit together. In the rotary compressor according to the second embodiment, the first bearing has a contact surface that contacts the muffler. In the rotary compressor according to the second embodiment, the first bearing has a recess on its contact surface and the muffler has a convex part on the surface facing the contact surface, or the first bearing has a convex part on its contact surface and the muffler has a recess facing the contact surface. In the rotary compressor according to the second embodiment, the contact surface includes the surface of the first bearing that faces the muffler.

[0071] Figure 11 is a perspective view of an upper bearing 332, which is an example of an upper bearing in a rotary compressor according to the second embodiment. Figure 12 is a perspective view of a muffler 390, which is an example of a muffler in a rotary compressor according to the second embodiment.

[0072] The upper bearing 332 has a main body portion 332a, an outer peripheral wall portion 332b, and a main bearing portion 332c. The upper bearing 332 is formed by integrally molding the main body portion 332a, the outer peripheral wall portion 332b, and the main bearing portion 332c.

[0073] The main body portion 332a has a disc-shaped form. The main body portion 332a has a through hole 332h through which a bolt passes. The main body portion 332a has a discharge hole 332d through which compressed refrigerant is discharged. The main body portion 332a has an upper surface 332S on which the muffler 390 is mounted. The main body portion 332a has a recess 332e on the upper surface 332S.

[0074] The outer peripheral wall portion 332b has a thick, annular shape at the outer peripheral edge of the main body portion 332a. The outer peripheral wall portion 332b is fixed to the body portion 11a of the casing 11.

[0075] The main bearing portion 332c is provided projecting upward from the main body portion 332a. The main bearing portion 332c has a cylindrical shape. The main bearing portion 332c rotatably supports the shaft 81. The main bearing portion 332c constitutes a radial bearing.

[0076] The muffler 390 is positioned to cover the discharge hole 332d in the upper bearing 332. By covering the discharge hole 332d, the muffler 390 suppresses the generation of noise caused by the refrigerant discharged from the discharge hole 332d.

[0077] The muffler 390 has an opening 391 through which the main bearing portion 332c of the upper bearing 332 passes. The muffler 390 has a discharge port through which the refrigerant discharged from the discharge port 332d is discharged. In a top view, the discharge port is offset by 90 degrees from the discharge port 332d, with respect to the center of the opening 391.

[0078] The muffler 390 has a through hole 393 through which a bolt 95 passes. The muffler 390 has a protrusion 393p on its lower surface 390S, which is opposite to the upper surface 332S.

[0079] The protrusion 393p and the recess 332e fit together. The fitting of the protrusion 393p and the recess 332e aligns the upper bearing 332 and the muffler 390. By aligning and mounting the muffler 390 to the upper bearing 332, the muffler 390 is mounted so that there is a gap between it and the opening 391 around the entire circumference of the upper bearing 332. In other words, the protrusion 393p and the recess 332e become a positioning structure that determines the position of the muffler 390 relative to the upper bearing 332.

[0080] In the above example, the upper bearing 332 has a recess 332e and the muffler 390 has a protrusion 393p, but the upper bearing 332 may have a protrusion and the muffler 390 may have a recess, with the protrusion and recess fitting together.

[0081] According to the rotary compressor of the second embodiment, the first bearing has one of a recess and a protrusion, and the muffler has the other of a recess and a protrusion, and the position of the muffler relative to the first bearing can be determined such that there is a gap between the muffler opening and the first bearing when the recess and the protrusion fit together.

[0082] <Third Embodiment> A rotary compressor according to the third embodiment will now be described. The rotary compressor according to the third embodiment has a different contact surface compared to the rotary compressor according to the second embodiment. The contact surface in the rotary compressor according to the third embodiment includes the side surface of the first bearing.

[0083] Figure 13 is a perspective view of an upper bearing 432, which is an example of an upper bearing in a rotary compressor according to the third embodiment. Figure 14 is a perspective view of a muffler 490, which is an example of a muffler in a rotary compressor according to the third embodiment.

[0084] The upper bearing 432 has a main body portion 432a, an outer peripheral wall portion 432b, and a main bearing portion 432c. The upper bearing 432 is formed by integrally molding the main body portion 432a, the outer peripheral wall portion 432b, and the main bearing portion 432c.

[0085] The main body portion 432a has a disc-shaped form. The main body portion 432a has a through hole 432h through which a bolt passes. The main body portion 432a has a discharge hole 432d through which compressed refrigerant is discharged. The main body portion 432a has an upper surface 432S and a side surface 432S1 on which the muffler 490 is mounted. The main body portion 432a has a recess 432e on the side surface 432S1.

[0086] The outer peripheral wall portion 432b has a thick, annular shape at the outer peripheral edge of the main body portion 432a. The outer peripheral wall portion 432b is fixed to the body portion 11a of the casing 11.

[0087] The main bearing portion 432c is provided projecting upward from the main body portion 432a. The main bearing portion 432c has a cylindrical shape. The main bearing portion 432c rotatably supports the shaft 81. The main bearing portion 432c constitutes a radial bearing.

[0088] The muffler 490 is positioned to cover the discharge hole 432d in the upper bearing 432. By covering the discharge hole 432d, the muffler 490 suppresses the generation of noise caused by the refrigerant discharged from the discharge hole 432d.

[0089] The muffler 490 has an opening 491 through which the main bearing portion 432c of the upper bearing 432 passes. The muffler 490 has a discharge port through which the refrigerant discharged from the discharge port 432d is discharged. In a top view, the discharge port is offset by 90 degrees from the discharge port 432d, with respect to the center of the opening 491.

[0090] The muffler 490 has a through hole 493 through which a bolt 95 passes. The muffler 490 has a lower surface 490S that faces the upper surface 432S. The muffler 490 also has a cylindrical portion 493b that protrudes downward. The inner surface of the cylindrical portion 493b faces the side surface 432S1. The muffler 490 has a convex portion 493p that protrudes inward from the cylindrical portion 493b.

[0091] The protrusion 493p and the recess 432e fit together. The fitting of the protrusion 493p and the recess 432e aligns the upper bearing 432 and the muffler 490. By aligning and mounting the muffler 490 to the upper bearing 432, the muffler 490 is mounted so that it has a gap with the opening 491 around the entire circumference of the upper bearing 432. In other words, the protrusion 493p and the recess 432e become a positioning structure that determines the position of the muffler 490 relative to the upper bearing 432.

[0092] In the above example, the upper bearing 432 has a recess 432e and the muffler 490 has a protrusion 493p, but the upper bearing 432 may have a protrusion and the muffler 490 may have a recess, with the protrusion and recess fitting together.

[0093] According to the rotary compressor of the third embodiment, the first bearing has one of a recess and a protrusion, and the muffler has the other of a recess and a protrusion, and the position of the muffler relative to the first bearing can be determined such that there is a gap between the muffler opening and the first bearing when the recess and the protrusion are fitted together.

[0094] <Refrigeration System> A refrigeration system equipped with a rotary compressor according to this embodiment will be described. Figure 15 is a schematic diagram of a refrigeration system 100, which is an example of a refrigeration system equipped with a rotary compressor according to this embodiment.

[0095] The refrigeration system 100 includes a compressor 101, a four-way valve 102, a heat exchanger 103, an expansion valve 104, and a heat exchanger 105. The compressor 101 is a rotary compressor according to this embodiment.

[0096] First, we will explain the case where the refrigeration system 100 is cooled by the heat exchanger 105. Figure 15 shows the connections when the refrigeration system 100 is cooled by the heat exchanger 105.

[0097] The refrigerant compressed by the compressor 101 is supplied to the heat exchanger 103 through the four-way valve 102. In the heat exchanger 103, the refrigerant supplied to the heat exchanger 103 is cooled by heat exchange with air or the like. The refrigerant cooled in the heat exchanger 103 condenses and liquefies, and is supplied to the expansion valve 104. The refrigerant is depressurized by the expansion valve 104. The depressurized refrigerant is supplied to the heat exchanger 105. In the heat exchanger 105, the refrigerant evaporates and vaporizes. The refrigerant discharged from the heat exchanger 105 then returns to the compressor 101 and is compressed again. In the heat exchanger 105, the refrigeration device 100 cools the object by the heat of vaporization caused by the evaporation of the refrigerant.

[0098] Next, we will explain the case where the refrigeration system 100 is heated by the heat exchanger 105. The refrigerant compressed by the compressor 101 is supplied to the heat exchanger 105 through the four-way valve 102. In the heat exchanger 105, the refrigeration system 100 heats the object by supplying the compressed, high-temperature refrigerant. The refrigerant that has undergone heat exchange in the heat exchanger 105 condenses and liquefies, and is supplied to the expansion valve 104. The refrigerant is depressurized by the expansion valve 104. The depressurized refrigerant is supplied to the heat exchanger 103. In the heat exchanger 103, the refrigerant evaporates and vaporizes by exchanging heat with air or the like. The refrigerant discharged from the heat exchanger 103 then passes through the four-way valve 102 and returns to the compressor 101 to be compressed again.

[0099] While embodiments have been described above, it will be understood that various modifications to the form and details are possible without departing from the spirit and scope of the claims. Various modifications and improvements are possible, such as combinations or substitutions with some or all of other embodiments.

[0100] This application claims priority to Basic Patent Application No. 2024-170511, filed with the Japan Patent Office on September 30, 2024, the entire contents of which are incorporated herein by reference.

[0101] 1 Rotary compressor 10 Compressor body 11 Casing 31 Lower bearings 32, 332, 432 Upper bearings 32a, 332a, 432a Body section 32c, 332c, 432c Main bearing section 32d, 332d, 432d Discharge holes 332e, 432e Recesses 32h, 332h, 432h Through holes 32S, 332S, 432S Top surface 432S1 Side surface 41, 42 Cylinders 61, 62 Rollers 70 Compression mechanism 80 Motor 81 Shafts 90, 190, 290, 390, 490 Mufflers 90S, 390S, 490S Bottom surface 490S1 Side surface 91, 391, 491 Opening 92 Discharge holes 93, 193, 194, 293, 294, 393 Through holes 93p, 193p, 293p Projections 393p, 493p Convex parts 95 Bolt 100 Refrigeration device

Claims

1. The apparatus comprises a shaft (81) extending in a first direction (Z), a motor (80) that drives the shaft (81), first bearings (32, 332, 432) that support the shaft (81) and have discharge holes (32d, 332d, 432d) from which compressed refrigerant is discharged, cylinders (41, 42) that form a cylinder chamber inside, rollers (61, 62) fixed to the shaft (81) and rotating eccentrically in the cylinder chamber, and mufflers (90, 190, 290, 390, 490) arranged to cover the discharge holes (32d, 332d, 432d), wherein the motor (80), the mufflers (90, 190, 290, 390, 490), the first bearings (32, 332, 432), and the cylinders (41, 42) are arranged in order along the first direction (Z). The first bearing (32, 332, 432) supports the shaft (81) and has boss portions (32c, 332c, 432c) that protrude toward the muffler (90, 190, 290, 390, 490), and the muffler (90, 190, 290, 390, 490) has openings (91, 391, 491) through which the boss portions (32c, 332c, 432c) pass. Rotary compressor (1), wherein the first bearings (32, 332, 432) or the mufflers (90, 190, 290, 390, 490) have positioning structures (93p, 193p, 293p, 332e, 432e, 393p, 493p) that determine the position of the mufflers (90, 190, 290, 390, 490) relative to the first bearings (32, 332, 432) such that there is a gap between the mufflers (90, 190, 290, 390, 490) and the openings (91, 391, 491) around the entire circumference in the outer direction of the boss portions (32c, 332c, 432c).

2. The rotary compressor (1) according to claim 1, wherein the first bearing (32) has a first hole (32h) into which a bolt (95) is inserted, the muffler (90, 190, 290) has a second hole (93, 193, 293) into which the bolt (95) is inserted, and a projection that protrudes from the periphery of the second hole (93, 193, 293) toward the first bearing (32), the positioning structure (93p, 193p, 293p) is the projection (93p, 193p, 293p), and the projection (93p, 193p, 293p) is positioned between the bolt (95) and the first hole (32h).

3. The first bearings (332, 432) have contact surfaces (332S, 432S1) that contact the mufflers (390, 490), the first bearings (32, 332, 432) have recesses (332e, 432e) on the contact surfaces (332S, 432S1), and the mufflers (390, 490) have protrusions (390p, 493p) on the surfaces (390S, 490S1) facing the contact surfaces (332S, 432S1), or the first bearings (332, 432) have protrusions on the contact surfaces, and the mufflers (390, 490) have recesses facing the contact surfaces. The positioning structure (332e, 432e, 393p, 493p) comprises the recess (332e, 432e) and the protrusion (393p, 493p), wherein the protrusion (393p, 493p) and the recess (332e, 432e) fit together, the rotary compressor according to claim 1.

4. The rotary compressor according to claim 3, wherein the contact surface (332S) includes the surface (332S) of the first bearing (332) that faces the muffler (390).

5. The rotary compressor according to claim 3, wherein the contact surface (432S1) includes the side surface (432S1) of the first bearing (432).

6. The rotary compressor according to any one of claims 1 to 5, having two or more of the positioning structures (93p, 193p, 293p, 332e, 432e, 393p, 493p).

7. The rotary compressor according to claim 6, wherein one of the positioning structures (93p, 193p, 293p, 332e, 432e, 393p, 493p) is provided at a position offset from the axial rotation symmetry of the other positioning structures (93p, 193p, 293p, 332e, 432e, 393p, 493p).

8. A refrigeration system (100) comprising a rotary compressor (1) according to any one of claims 1 to 7.

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