Rotary compressor and refrigeration device

Abstract

A rotary compressor includes a shaft extending in a first direction, a motor to drive the shaft, a first bearing including a discharge hole to discharge a compressed refrigerant, and supporting the shaft, a cylinder including a cylinder chamber formed inside the cylinder, a roller to eccentrically rotate in the cylinder chamber, and a muffler disposed so as to cover the discharge hole, wherein the motor, the muffler, the first bearing, and the cylinder are arranged in stated order along the first direction, the first bearing includes a boss which supports the shaft and protrudes toward the muffler, the muffler includes an opening through which the boss is disposed, and the first bearing or the muffler includes one or more positioning structures to determine a position of the muffler with respect to the first bearing such that clearance in the opening is formed along an entire periphery of the boss.

Description

TECHNICAL FIELD

[0001] The disclosures herein relate to rotary compressors and refrigeration apparatuses. A rotary compressor compresses gas in a compression chamber formed in a cylinder by eccentrically rotating a roller in the cylinder. The rotary compressor generally has a vane for partitioning the compression chamber. The rotary compressor includes what is called a rolling piston type in which the roller eccentrically rotates while a vane separate from the roller abuts on the roller, what is called a swing type in which a vane seamlessly formed with the roller swings with the eccentric rotation of the roller, and what is called a hinge vane type in which the tip of the vane is rotatably engaged in a recess formed in the outer peripheral surface of the roller, while the roller rotates eccentrically.BACKGROUND ART

[0002] Patent Literature (PTL) 1 discloses a compressor including a front head member and a muffler member. PTL 1 discloses that the front head member in the compressor has a disk where a front head discharge hole through which compressed refrigerant is discharged is formed, and a tubular boss extending from the peripheral edge of the front head opening provided in the disk. PTL 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. PTL 1 discloses that the tubular boss has a muffler opening through which the muffler opening is penetrated, and that the tubular boss adheres at least at two positions on the outer peripheral surface of the tubular boss in a state where the tubular boss penetrates the muffler opening.CITATION LISTPATENT LITERATURE

[0003] PTL 1: Japanese Laid-Open Patent Publication No. 2012-021407SUMMARY OF THE INVENTIONPROBLEM TO BE SOLVED BY THE INVENTION

[0004] However, noise is generated due to variation in clearances between the tubular boss and the muffler opening.

[0005] The present disclosure provides a compressor which reduces noise generation by reducing variation in a clearance between a muffler and a bearing with respect to the bearing having a discharge hole.MEANS OF SOLVING THE PROBLEM

[0006] A rotary compressor according to aspect 1 includes a shaft extending in a first direction, a motor configured to drive the shaft, a first bearing including a discharge hole configured to discharge a compressed refrigerant, and supporting the shaft, a cylinder including a cylinder chamber formed inside the cylinder, a roller fixed to the shaft and configured to eccentrically rotate in the cylinder chamber, and a muffler disposed so as to cover the discharge hole, wherein the motor, the muffler, the first bearing, and the cylinder are arranged in stated order along the first direction, the first bearing includes a boss which supports the shaft and protrudes toward the muffler, the muffler includes an opening through which the boss is disposed, and the first bearing or the muffler includes one or more positioning structures configured to determine a position of the muffler with respect to the first bearing such that clearance in the opening is formed along an entire periphery of the boss.

[0007] According to a rotary compressor of aspect 1, noise can be reduced by determining the position of the muffler with respect to the first bearing such that the clearance with the opening is formed.

[0008] Aspect 2 of the present disclosure is the rotary compressor according to aspect 1, wherein the first bearing includes one or more first holes into which one or more bolts are inserted, the muffler includes one or more second holes into which the one or more bolts are inserted, and one or more protrusions provided to protrude from a periphery of the one or more second holes toward the first bearing, the one or more positioning structures are the one or more protrusions, and the one or more protrusions are disposed between the one or more bolts and a surface of the one or more first holes.

[0009] According to the rotary compressor of aspect 2, the position of the muffler with respect to the first bearing can be determined by mounting the muffler with the bolts such that the clearance with the opening is formed.

[0010] Aspect 3 of the present disclosure is the rotary compressor according to aspect 1, wherein the first bearing includes a contact surface configured to come in contact with the muffler, the first bearing includes one or more recesses on the contact surface and the muffler includes one or more projections on a surface opposite the contact surface, or the first bearing includes one or more projections on the contact surface and the muffler includes one or more recesses opposite the contact surface, the one or more positioning structures include the one or more recesses and the one or more projections, and the one or more projections and the one or more recesses are configured to engage with each other.

[0011] According to the rotary compressor of aspect 3, the position of the muffler with respect to the first bearing can be determined by engaging the recess and the projection with each other such that the clearance with the opening is formed.

[0012] Aspect 4 of the present disclosure is the rotary compressor according to aspect 3, wherein the contact surface includes a surface of the first bearing opposite the muffler.

[0013] According to the rotary compressor of aspect 4, the recess and the projection for determining the position of the muffler with respect to the first bearing can be easily formed.

[0014] Aspect 5 of the present disclosure is the rotary compressor according to aspect 3, wherein the contact surface includes a lateral surface of the first bearing.

[0015] According to the rotary compressor of aspect 5, the position of the muffler with respect to the first bearing can be determined more accurately.

[0016] Aspect 6 of the present disclosure is the rotary compressor according to any one of aspects 1 to 5, including said two or more positioning structures.

[0017] According to the rotary compressor of aspect 6, generation of noise can be reduced by positioning the muffler with respect to the first bearing such that the clearance with the opening is formed.

[0018] Aspect 7 of the present disclosure is the rotary compressor according to aspect 6, wherein one of the positioning structures is disposed at a position deviated from an axis of rotational symmetry of other positioning structures.

[0019] According to the rotary compressor of aspect 7, the muffler can be mounted in the correct direction with respect to the first bearing.

[0020] A refrigeration apparatus according to aspect 1 includes the rotary compressor of any one of aspects 1 to 7.

[0021] According to the refrigeration apparatus of aspect 1, in the rotary compressor included in the refrigeration apparatus, the generation of noise can be reduced by positioning the muffler with respect to the first bearing such that the clearance with the opening is formed.BRIEF DESCRIPTION OF THE DRAWINGS

[0022] [FIG. 1] FIG. 1 is a perspective view illustrating a rotary compressor according to a first embodiment. [FIG. 2] FIG. 2 is a cross-sectional view illustrating the rotary compressor according to the first embodiment. [FIG. 3] FIG. 3 is a perspective view illustrating an upper bearing and a muffler of the rotary compressor according to the first embodiment. [FIG. 4] FIG. 4 is a plan view illustrating the upper bearing and the muffler of the rotary compressor according to the first embodiment. [FIG. 5] FIG. 5 is a view illustrating mounting of the muffler on the upper bearing in the rotary compressor according to the first embodiment. [FIG. 6] FIG. 6 is a perspective view illustrating the muffler of the rotary compressor according to the first embodiment. [FIG. 7] FIG. 7 is a bottom view illustrating the muffler of the rotary compressor according to the first embodiment. [FIG. 8] FIG. 8 is a cross-sectional view illustrating the upper bearing and the muffler of the rotary compressor according to the first embodiment. [FIG. 9] FIG. 9 is a perspective view illustrating a first modification of a muffler of the rotary compressor according to the first embodiment. [FIG. 10] FIG. 10 is a perspective view illustrating a second modification of a muffler of the rotary compressor according to the first embodiment. [FIG. 11] FIG. 11 is a perspective view illustrating an upper bearing and a muffler of a rotary compressor according to a second embodiment. [FIG. 12] FIG. 12 is a perspective view illustrating the muffler of the rotary compressor according to the second embodiment. [FIG. 13] FIG. 13 is a perspective view illustrating an upper bearing of a rotary compressor according to a third embodiment. [FIG. 14] FIG. 14 is a perspective view illustrating a muffler of the rotary compressor according to the third embodiment. [FIG. 15] FIG. 15 is a schematic diagram illustrating a refrigeration apparatus including the rotary compressor according to the present embodiments. DESCRIPTION OF THE PREFERRED EMBODIMENTS<FIRST EMBODIMENT>

[0023] In the following, a rotary compressor according to a first embodiment will be described with reference to the accompanying drawings. Although the embodiment will be described below, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the claims.

[0024] In the drawings, the same constituent elements are denoted with the same reference numerals, and redundant description thereabout may be omitted. In addition, in each of the drawings, dimensions, ratios, or numbers may be exaggerated or simplified as necessary to facilitate understanding of the invention.

[0025] In directions such as parallel, right angle, orthogonal, horizontal, vertical, top and bottom, left and right, front and rear, and the like, a shift is permitted to a degree that does not impair the effect of the embodiment. The shape of a corner is not limited to a right angle and may be rounded. Terms such as parallel, right angle, orthogonal, horizontal, and vertical may include substantially parallel, substantially right angle, substantially orthogonal, substantially horizontal, and substantially vertical, respectively.

[0026] For example, substantially parallel means that even if two lines or two surfaces are not completely parallel to each other, they can be treated as parallel to each other within manufacturing tolerances. Other terms such as substantially right angle, substantially orthogonal, substantially horizontal, and substantially vertical are also intended to include cases where a positional relationship between two lines or two surfaces is within manufacturing tolerances.

[0027] The rotary compressor according to the first embodiment will be described. The rotary compressor according to the first embodiment includes a shaft extending in a first direction, a motor for driving the shaft, a discharge hole for discharging a compressed refrigerant, a first bearing for supporting the shaft, and a cylinder including a cylinder chamber formed inside the cylinder. The rotary compressor according to the first embodiment further includes a piston fixed to the shaft and for eccentrically rotating in the cylinder chamber, and a muffler disposed so as to cover the discharge hole. In the rotary compressor according to the first embodiment, the motor, the muffler, the first bearing, and the cylinder are arranged in order along the first direction. The first bearing in the rotary compressor according to the first embodiment includes a boss which supports the shaft and protrudes toward the muffler. The muffler in the rotary compressor according to the first embodiment includes an opening through which the boss is disposed. Further, in the rotary compressor according to the first embodiment, the first bearing or the muffler includes positioning structures for determining a position of the muffler with respect to the first bearing such that the opening is formed along an entire periphery of the boss.

[0028] The first bearing in the rotary compressor according to the first embodiment includes first holes into which bolts are inserted. Further, the muffler in the rotary compressor according to the first embodiment includes second holes into which the bolts are inserted, and protrusions provided to protrude from a periphery of the second holes toward the first bearing. In the rotary compressor according to the first embodiment, the positioning structures are the protrusions, and the protrusions are disposed between the bolts and the first holes.

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

[0030] A virtual three-dimensional coordinate system (XYZ Cartesian coordinate system) composed of an X-axis, a Y-axis, and a Z-axis (XYZ axes) orthogonal to each other may be set in the drawings for convenience of explanation. For example, when a black circle is shown within a circle representing a coordinate axis that is perpendicular to the paper surface of the drawing, it indicates that the coordinate axis is directed toward the front side of the paper. When a cross is shown within a circle representing a coordinate axis, it indicates that the coordinate axis is directed toward the back side of the paper.

[0031] Note that the coordinate system is defined for the purpose of explanation and is not limited to the state of the rotary compressor or the like according to the present embodiment.

[0032] In the following drawings, the shaft 81 of the rotary compressor 1 extends along the Z-axis, and the rollers 61 and 62 of the rotary compressor 1 rotate in a plane parallel to the XY plane including the X-axis and Y-axis.

[0033] A view in which an object is viewed in the opposite direction of the Z-axis from the +Z side along the Z-axis direction is referred to as a plan view. Viewing an object in the opposite direction of the Z-axis from the +Z side along the Z-axis direction is referred to as viewing in plan view. A view in which an object is viewed in the direction of the Z-axis from the -Z side along the Z-axis direction is referred to as a bottom view. Viewing an object in the direction of the Z-axis from the -Z side along the Z-axis direction is referred to as viewing in bottom view.

[0034] The rotary compressor 1 compresses a refrigerant. The refrigerant used in the rotary compressor 1 is, for example, carbon dioxide. The refrigerant is not limited to carbon dioxide, but may be, for example, a fluorocarbon refrigerant, a hydrofluoroolefin refrigerant, or a hydrocarbon refrigerant. The rotary compressor 1 includes a compressor body 10 and an accumulator 20.[COMPRESSOR BODY 10]

[0035] The compressor body 10 includes a casing 11, a suction pipe 12, a discharge pipe 13, and a power terminal 15. The casing 11 also includes a plate 14 for installing the compressor body 10.

[0036] The casing 11 is a tubular hermetic container. The casing 11 includes a shell 11a, an upper mirror plate 11b, and a lower mirror plate 11c. The ends of the shell 11a are closed by the upper mirror plate 11b and the lower mirror plate 11c, respectively. By closing the shell 11a by the pair of the upper mirror plate 11b and the lower mirror plate 11c, the casing 11 is sealed.

[0037] The shell 11a has a tubular shape. The suction pipe 12 is mounted on a lower portion of the shell 11a provided in the casing 11. Each of the upper mirror plate 11b and the lower mirror plate 11c has a dish-like shape. The discharge pipe 13 is mounted on an upper portion of the shell 11a provided in the casing 11.

[0038] The compressor body 10 includes a compression mechanism 70 and a motor 80 in 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 by the compression mechanism 70 is discharged from the discharge pipe 13 to the outside of the rotary compressor 1.

[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. By rotating each of the rollers 61 and 62, the refrigerant is compressed in the compression mechanism 70. When each of the rollers 61 and 62 rotates, the compression chamber is partitioned by vanes.

[0040] The shaft 81 has a flow passage in which lubricating oil flows. The shaft 81 has a communication hole penetrating from the internal flow passage to the outside of the shaft 81 for supplying lubricating oil to each of the lower bearing 31, the cylinder 41, the cylinder 42 and the upper bearing 32.

[0041] The shaft 81 has a main shaft 82, an eccentric part 83, an intermediate coupling portion 84, an eccentric part 86, and an auxiliary shaft 87. The shaft 81 is seamlessly formed with the main shaft 82, the eccentric part 83, the intermediate coupling portion 84, the eccentric part 86, and the auxiliary shaft 87.

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

[0043] The eccentric part 83 is a cylindrical part having a larger diameter than the main shaft 82. The central axis of the eccentric part 83 is eccentric from the central axis of the main shaft 82. A roller 62 is mounted on the eccentric part 83.

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

[0045] The eccentric part 86 is a cylindrical part having a diameter larger than that of the main shaft 82. The center axis of the eccentric part 86 is eccentric from the center axis of the main shaft 82. The eccentric part 86 is eccentric to the side opposite to the eccentric part 83 with respect to the center axis of the main shaft 82. A roller 61 is mounted on the eccentric part 86. The lower surface of the eccentric part 86 slides with the upper surface of the lower bearing 31.

[0046] The auxiliary shaft 87 has a cylindrical or tubular shape. The auxiliary shaft 87 is rotatably supported by the lower bearing 31. The auxiliary shaft 87 is included in 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. In the compression mechanism 70, the lower bearing 31, the cylinder 41, the middle plate 33, the cylinder 42, and the upper bearing 32 are stacked in this order from below. The muffler 90 is mounted on 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 arranged above each of the cylinder 41 and the cylinder 42. The lower bearing 31 is arranged below each of the cylinder 41 and the cylinder 42. A 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 a communication hole penetrating from an 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 the roller 61 eccentrically rotated by the shaft 81 in a cylinder chamber formed inside the cylinder 41. The lower surface of the roller 61 slides with the upper surface of the lower bearing 31. The upper surface of the roller 61 slides with the lower surface of the middle plate 33.

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

[0051] Mounting of the muffler 90 on the upper bearing 32 will be described. FIG. 3 is a perspective view illustrating the upper bearing 32 and the muffler 90 of the rotary compressor 1, in the example of the rotary compressor according to the first embodiment. FIG. 4 is a plan view illustrating the upper bearing 32 and the muffler 90 of the rotary compressor 1, in the example of the rotary compressor according to the first embodiment. FIG. 5 is a view illustrating mounting of the muffler 90 on the upper bearing 32 in the rotary compressor 1, in the example of the rotary according to the first embodiment.

[0052] The muffler 90 is mounted on the upper portion of the upper bearing 32. The muffler 90 is mounted on the upper bearing 32 by a plurality of bolts 95.

[0053] The upper bearing 32 has a main body 32a, an outer peripheral wall 32b, and a main bearing 32c. The upper bearing 32 is seamlessly formed to include the main body 32a, the outer peripheral wall 32b, and the main bearing 32c.

[0054] The main body 32a has a disk-like shape. The main body 32a is disposed adjacent to the cylinder 42 on the upper side thereof. The main body 32a is disposed so as to cover the upper end surface of the cylinder 42. The lower surface of the main body 32a is in close contact with the cylinder 42. The main body 32a has through-holes 32h through which the bolts 95 pass. The main body 32a has a discharge hole 32d through which the compressed refrigerant is discharged. The main body 32a has an upper surface 32S on which the muffler 90 is placed.

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

[0056] The main bearing 32c is provided so as to protrude upward from the main body 32a. The main bearing 32c has a tubular shape. The main bearing 32c rotatably supports the shaft 81. The main bearing 32c is included in a radial bearing.

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

[0058] The muffler 90 is arranged so as to cover the discharge hole 32d in the upper bearing 32. By covering the discharge hole 32d, the muffler 90 reduces 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 32c in the upper bearing 32 penetrates. The muffler 90 has a discharge hole 92 through which the refrigerant discharged from the discharge hole 32d is discharged. The discharge hole 92 is displaced from the discharge hole 32d by 90 degrees about the center of the opening 91 in a top view.

[0060] The muffler 90 has through-holes 93 through which the bolts 95 penetrate. The muffler 90 has protrusions 93p provided so as to protrude from the peripheral edges of each of the through-holes 93 toward the upper bearing 32. The protrusions 93p protrude from a lower surface 90S of the muffler 90 opposite to the upper surface 32S.

[0061] A protrusion 93p indicated by an arrow A is disposed at a position deviated from an axis of rotational symmetry of other positioning structures 93p.

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

[0063] The protrusions 93p are engaged with the through-holes 32h in the upper bearing 32. The protrusions 93p are arranged between the bolts 95 and the wall surfaces forming the through-holes 32h. By engaging the protrusions 93p with the through-holes 32h, the upper bearing 32 and the muffler 90 are aligned. By aligning and mounting the muffler 90 on the upper bearing 32, the muffler 90 is mounted such that a clearance d with the opening 91 is formed along the entire periphery of the upper bearing 32. That is, the protrusions 93p are positioning structures for determining the position of the muffler 90 with respect to the upper bearing 32.

[0064] According to the rotary compressor according to the first embodiment, the position of the muffler relative to the first bearing can be defined such that clearance with a muffler opening is formed at the muffler opening by providing protrusions that protrude toward the first bearing from the peripheral edges of the second holes into which the bolts are inserted to the muffler.

[0065] A modification of the rotary compressor according to the first embodiment will be described. FIG. 9 is a perspective view illustrating a first modification of a muffler 190 of the rotary compressor according to the first embodiment. FIG. 10 is a perspective view illustrating a first modification of a muffler 290 of 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 penetrate. It is sufficient that at least two 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 in which protrusions 193p are formed and two through-holes 194 in which no protrusions are formed. The muffler 290 also has two through-holes 293 in which protrusions 293p are formed and two through-holes 294 in which no protrusions are formed.

[0067] The muffler 190 and the muffler 290 have different through-holes in which protrusions are formed. In the muffler 290, protrusions are formed in through-holes in which protrusions are not formed in the muffler 190.

[0068] Although protrusions are formed in opposing through-holes in the examples of the muffler 190 and the muffler 290, protrusions may be formed in adjacent through-holes. The muffler according to the embodiment may have protrusions in 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 32c is an example of the boss.<SECOND EMBODIMENT>

[0070] A rotary compressor according to a second embodiment will be described. The positioning structure in the rotary compressor according to the first embodiment is a protrusion, but the positioning structure in the rotary compressor according to the second embodiment is a recess and a projection engaging with each other. A first bearing according to the second embodiment includes a contact surface configured to come in contact with the muffler. In the rotary compressor according to the second embodiment, the first bearing includes recesses on the contact surface and the muffler includes projections on a surface opposite the contact surface, or the first bearing includes projections on the contact surface and the muffler includes recesses opposite the contact surface. In the rotary compressor according to the second embodiment, the contact surface includes a surface on the first bearing opposite the muffler.

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

[0072] The upper bearing 332 has a main body 332a, an outer peripheral wall 332b, and a main bearing 332c. The upper bearing 332 is seamlessly formed to include the main body 332a, the outer peripheral wall 332b, and the main bearing 332c.

[0073] The main body 332a has a disk-like shape. The main body 332a has through-holes 332h through which bolts pass. The main body 332a has a discharge hole 332d through which a compressed refrigerant is discharged. The main body 332a has an upper surface 332S on which the muffler 390 is placed. The main body 332a has recesses 332e on the upper surface 332S.

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

[0075] The main bearing 332c projects upward from the main body 332a. The main bearing 332c has a tubular shape. The main bearing 332c rotatably supports the shaft 81. The main bearing 332c is included in a radial bearing.

[0076] The muffler 390 is arranged so as to cover the discharge hole 332d in the upper bearing 332. By covering the discharge hole 332d, the muffler 390 reduces 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 332c in the upper bearing 332 penetrates. The muffler 390 has a discharge hole through which the refrigerant discharged from the discharge hole 332d is discharged. The discharge hole is displaced from the discharge hole 332d by 90 degrees about the center of the opening 391 in a top view.

[0078] The muffler 390 has through-holes 393 through which the bolts 95 pass. The muffler 390 has projections 393p on a lower surface 390S facing the upper surface 332S of the muffler 390.

[0079] The projections 393p and the recesses 332e engage with each other. By engaging the projections 393p with the recesses 332e, the upper bearing 332 and the muffler 390 are aligned. By aligning and mounting the muffler 390 on the upper bearing 332, the muffler 390 is mounted such that clearance with the opening 391 is formed along the entire periphery of the upper bearing 332. That is, the projections 393p and the recesses 332e form positioning structures for determining the position of the muffler 390 with respect to the upper bearing 332.

[0080] In the above example, the upper bearing 332 has the recesses 332e and the muffler 390 has the projections 393p, but the upper bearing 332 may have the projections and the muffler 390 may have the recesses, and the projections and the recesses may engage with each other.

[0081] According to the rotary compressor according to the second embodiment, the position of the muffler relative to the first bearing can be determined such that the first bearing has a recess and the muffler has a projection, or vice versa, and the recess and projection engage with each other such that clearance with the muffler opening is formed.<THIRD EMBODIMENT>

[0082] A rotary compressor according to the third embodiment will be described. The rotary compressor according to the third embodiment has a different contact surface from the rotary compressor according to the second embodiment. The contact surface of the rotary compressor according to the third embodiment includes a lateral surface of the first bearing.

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

[0084] The upper bearing 432 has a main body 432a, an outer peripheral wall 432b, and a main bearing 432c. The upper bearing 432 is seamlessly formed to include the main body 432a, the outer peripheral wall 432b, and the main bearing 432c.

[0085] The main body 432a has a disk-like shape. The main body 432a has through-holes 432h through which bolts pass. The main body 432a has a discharge hole 432d through which a compressed refrigerant is discharged. The main body 432a has an upper surface 432S and a lateral surface 432S1 on which the muffler 490 is placed. The main body 432a has a recess 432e on the lateral surface 432S1.

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

[0087] The main bearing 432c protrudes upward from the main body 432a. The main bearing 432c has a tubular shape. The main bearing 432c rotatably supports the shaft 81. The main bearing 432c is included in a radial bearing.

[0088] The muffler 490 is arranged so as to cover the discharge hole 432d in the upper bearing 432. By covering the discharge hole 432d, the muffler 490 reduces 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 432c in the upper bearing 432 penetrates. The muffler 490 has a discharge hole through which the refrigerant discharged from the discharge hole 432d is discharged. The discharge hole is displaced from the discharge hole 432d by 90 degrees with respect to the center of the opening 491 in a top view.

[0090] The muffler 490 has through-holes 493 through which the bolts 95 pass. The muffler 490 has a lower surface 490S facing the upper surface 432S of the muffler 490. The muffler 490 has a tubular part 493b which is tubular and protrudes downward. The inner surface of the tubular part 493b faces the lateral surface 432S1. The muffler 490 has projections 493p protruding inward from the tubular part 493b.

[0091] The projections 493p and the recesses 432e engage with each other. By engaging the projections 493p with the recesses 432e, the upper bearing 432 and the muffler 490 are aligned. By aligning and mounting the muffler 490 to the upper bearing 432, the muffler 490 is mounted such that clearance with the opening 491 is formed along the entire periphery of the upper bearing 432. That is, the projections 493p and the recesses 432e form a positioning structure for determining the position of the muffler 490 with respect to the upper bearing 432.

[0092] In the above example, the upper bearing 432 has the recesses 432e and the muffler 490 has the projections 493p, but the upper bearing 432 may have the projections and the muffler 490 may have the recesses, and the projections and the recesses may engage with each other.

[0093] According to the rotary compressor according to the third embodiment, the position of the muffler relative to the first bearing can be determined such that the first bearing has a recess and the muffler has a projection, or vice versa, and the recess and projection engage with each other such that clearance with the muffler opening is formed.<REFRIGERATION APPARATUS>

[0094] A refrigeration apparatus including a rotary compressor according to the present embodiments will be described. FIG. 15 is a schematic diagram illustrating a refrigeration apparatus 100, in an example of the refrigeration apparatus including the rotary compressor according to the present embodiments.

[0095] The refrigeration apparatus 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 the present embodiment.

[0096] First, a case where cooling is performed by the heat exchanger 105 in the refrigeration apparatus 100 will be described. FIG. 15 shows a connection for cooling by the heat exchanger 105 in the refrigeration apparatus 100.

[0097] The refrigerant compressed by the compressor 101 is supplied to the heat exchanger 103 through the four-way valve 102. The refrigerant supplied to the heat exchanger 103 is cooled by heat exchange with air or the like in the heat exchanger 103. The refrigerant cooled by the heat exchanger 103 is condensed and liquefied, and 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. Then, the refrigerant discharged from the heat exchanger 105 returns to the compressor 101 and is compressed again. The refrigeration apparatus 100 cools the object by the heat of vaporization caused by the evaporation of the refrigerant in the heat exchanger 105.

[0098] Next, a case where the refrigerant is heated by the heat exchanger 105 in the refrigeration apparatus 100 will be described. The refrigerant compressed by the compressor 101 is supplied to the heat exchanger 105 through the four-way valve 102. The refrigerant compressed at a high temperature is supplied to the heat exchanger 105, whereby the refrigeration apparatus 100 heats the object. The refrigerant heat-exchanged in the heat exchanger 105 is condensed and liquefied, and supplied to the expansion valve 104. The refrigerant is decompressed by the expansion valve 104. The decompressed refrigerant is supplied to the heat exchanger 103. The refrigerant is vaporized by heat exchange with air or the like in the heat exchanger 103. Then, the refrigerant discharged from the heat exchanger 103 passes through the four-way valve 102 and returns to the compressor 101 again to be compressed.

[0099] Further, the present invention is not limited to these embodiments, and various variations and modifications may be made without departing from the scope of the present invention.

[0100] The present application is based on and claims priority to Japanese patent application No. 2024-170511 filed on September 30, 2024, with the Japan Patent Office, the entire contents of which are hereby incorporated by reference.EXPLANATION OF REFERENCE NUMERALS

[0101] 1rotary compressor 10compressor body 11casing 31lower bearing 32, 332, 432upper bearing 32a, 332a, 432amain body 32c, 332c, 432cmain bearing 32d, 332d, 432ddischarge hole 332e, 432erecess 32h, 332h, 432hthrough-hole 32S, 332S, 432Stop surface 432S1lateral surface 41, 42cylinder 61, 62roller 70compression mechanism 80motor 81shaft 90, 190, 290, 390, 490muffler 90S, 390S, 490Sbottom 490S1lateral 91,391,491opening 92discharge hole 93, 193, 194, 293, 294, 393through-hole 93p, 193p, 293pprotrusion 393p, 493pprojection 95bolt 100refrigeration apparatus

Claims

1. A rotary compressor (1) comprising: a shaft (81) extending in a first direction (Z); a motor (80) configured to drive the shaft (81); a first bearing (32, 332, 432) including a discharge hole (32d, 332d, 432d) configured to discharge a compressed refrigerant, and supporting the shaft (81); a cylinder (41, 42) including a cylinder chamber formed inside the cylinder (41, 42); a roller (61, 62) fixed to the shaft (81) and configured to eccentrically rotate in the cylinder chamber; and a muffler (90, 190, 290, 390, 490) disposed so as to cover the discharge hole (32d, 332d, 432d), wherein: the motor (80), the muffler (90, 190, 290, 390, 490), the first bearing (32, 332, 432), and the cylinder (41, 42) are arranged in stated order along the first direction (Z); the first bearing (32, 332, 432) includes a boss (32c, 332c, 432c) which supports the shaft (81) and protrudes toward the muffler (90, 190, 290, 390, 490); the muffler (90, 190, 290, 390, 490) includes an opening (91, 391, 491) through which the boss (32c, 332c, 432c) is disposed; and the first bearing (32, 332, 432) or the muffler (90, 190, 290, 390, 490) includes one or more positioning structures (93p, 193p, 293p, 332e, 432e, 393p, 493p) configured to determine a position of the muffler (90, 190, 290, 390, 490) with respect to the first bearing (32, 332, 432) such that clearance in the opening (91, 391, 491) is formed along an entire periphery of the boss (32c, 332c, 432c).

2. The rotary compressor (1) according to claim 1, wherein: the first bearing (32) includes one or more first holes (32h) into which one or more bolts (95) are inserted; the muffler (90, 190, 290) includes: one or more second holes (93, 193, 293) into which the one or more bolts (95) are inserted; and one or more protrusions provided to protrude from a periphery of the one or more second holes (93, 193, 293) toward the first bearing (32); the one or more positioning structures (93p, 193p, 293p) are the one or more protrusions (93p, 193p, 293p); and the one or more protrusions (93p, 193p, 293p) are disposed between the one or more bolts (95) and a surface of the one or more first holes (32h).

3. The rotary compressor according to claim 1, wherein: the first bearing (332, 432) includes a contact surface (332S, 432S1) configured to come in contact with the muffler (390, 490); the first bearing (32, 332, 432) includes one or more recesses (332e, 432e) on the contact surface (332S, 432S1) and the muffler (390, 490) includes one or more projections (390p, 493p) on a surface (390S, 490S1) opposite the contact surface (332S, 432S1), or the first bearing (332, 432) includes one or more projections on the contact surface and the muffler (390, 490) includes one or more recesses opposite the contact surface; the one or more positioning structures (332e, 432e, 393p, 493p) include the one or more recesses (332e, 432e) and the one or more projections (393p, 493p); and the one or more projections (393p, 493p) and the one or more recesses (332e, 432e) are configured to engage with each other.

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

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

6. The rotary compressor according to any one of claims 1 to 5, including said two or more 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 disposed at a position deviated from an axis of rotational symmetry of other positioning structures (93p, 193p, 293p, 332e, 432e, 393p, 493p).

8. A refrigeration apparatus (100) comprising the rotary compressor (1) of any one of claims 1 to 7.

Images