Rotary compressor

Abstract

A rotary compressor (1) comprising: a casing (10); a motor (20) installed inside the casing; a compression unit (40) installed under the motor; a plurality of refrigerant passages formed to vertically pass through the compression unit along an edge of the compression unit; an upper muffler (80) installed in a top surface of the compression unit and forming an upper muffler space which communicates with the plurality of refrigerant passages; an inner muffler (110) installed in a bottom surface of the compression unit and forming an inner muffler space which does not communicate with at least one refrigerant passage among the plurality of refrigerant passages but communicates with the remaining refrigerant passages; an outer muffler (120) installed under the inner muffler (110) and forming an outer muffler space which communicates with at least one refrigerant passage which does not communicate with the inner muffler space; and a refrigerant discharge passage (119) which is provided in a portion of the inner muffler (110) in contact with the outer muffler space and is formed to selectively discharge the refrigerant of the inner muffler space to the outer muffler space according to the flow rate of the refrigerant discharged from the bottom surface of the compression unit.

Description

rotary compressor

[0001] The present disclosure relates to a rotary compressor, and more particularly, to a rotary compressor having a muffler with variable capacity.

[0002] A compressor is a mechanical device that compresses an incoming gas, increasing its pressure and discharging it. Depending on their operating principles, compressors can be divided into reciprocating compressors and rotary compressors.

[0003] Among reciprocating compressors, there is a recipro compressor that converts the rotational motion of a motor into the linear reciprocating motion of a piston using a crank shaft and connecting rod to suck in and compress gas.

[0004] Rotary compressors include rotary compressors and scroll compressors.

[0005] A rotary compressor is formed to suck in and compress refrigerant by rotating a roller inside a cylinder of a compression unit by the rotational motion of a motor.

[0006] A scroll compressor is formed so that a rotating scroll rotates in a certain direction relative to a fixed scroll by the rotational motion of a motor, thereby sucking and compressing refrigerant.

[0007] In a rotary compressor, the refrigerant compressed by the compression unit is discharged into the casing, and then discharged to the outside of the casing through the refrigerant discharge pipe together with the oil inside the casing.

[0008] A rotary compressor according to one or more embodiments of the present disclosure may include: a casing; a motor installed inside the casing; a compression unit installed below the motor; a plurality of refrigerant passages formed by vertically penetrating the compression unit along an edge of the compression unit; an upper muffler installed on an upper surface of the compression unit and forming an upper muffler space communicating with the plurality of refrigerant passages; an inner muffler installed on a lower surface of the compression unit and forming an inner muffler space that is not communicated with at least one refrigerant passage among the plurality of refrigerant passages and is communicated with the remaining refrigerant passages; an outer muffler installed below the inner muffler and forming an outer muffler space that is communicated with the at least one refrigerant passage that is not communicated with the inner muffler space; and a refrigerant discharge passage provided on a portion of the inner muffler in contact with the outer muffler space and formed such that the refrigerant in the inner muffler space can be selectively discharged to the outer muffler space according to a flow rate of the refrigerant discharged from the lower surface of the compression unit.

[0009] According to one or more embodiments of the present disclosure, the refrigerant discharge passage may be formed with a plurality of holes.

[0010] According to one or more embodiments of the present disclosure, the plurality of holes can be formed with a perforation rate of 20% to 80%.

[0011] According to one or more embodiments of the present disclosure, the refrigerant discharge passage may be formed by a plate valve.

[0012] According to one or more embodiments of the present disclosure, a discharge hole may be provided on the lower surface of the compression unit through which compressed refrigerant is discharged. The discharge hole may be located in the internal muffler space.

[0013] According to one or more embodiments of the present disclosure, the plurality of refrigerant passages may include three refrigerant passages. The inner muffler may be formed such that the inner muffler space communicates with two refrigerant passages adjacent to the discharge hole in the direction of flow of the refrigerant discharged from the discharge hole among the three refrigerant passages, and does not communicate with a refrigerant passage far from the discharge hole in the direction of flow of the refrigerant.

[0014] According to one or more embodiments of the present disclosure, the outer muffler may be formed such that the outer muffler space communicates with a refrigerant passage far from the discharge hole that is not in communication with the inner muffler space among the three refrigerant passages.

[0015] According to one or more embodiments of the present disclosure, the inner muffler may be formed in a dome shape and may include a plurality of inner convex portions formed at regular intervals along the circumference of the inner muffler on a side surface of the inner muffler. The plurality of refrigerant passages communicating with the inner muffler space may be located in the plurality of inner convex portions.

[0016] According to one or more embodiments of the present disclosure, the outer muffler is formed in a dome shape corresponding to the inner muffler, and may include a plurality of outer convex portions formed at regular intervals along the circumference of the outer muffler on a side surface of the outer muffler. The number of the plurality of outer convex portions may be formed to be at least one more than the number of the plurality of inner convex portions.

[0017] According to one or more embodiments of the present disclosure, when the outer muffler and the inner muffler are coupled, all of the plurality of inner convex portions of the inner muffler can be coupled to the plurality of outer convex portions of the outer muffler. The uncoupled outer convex portions of the outer muffler that are not coupled to the plurality of inner convex portions of the inner muffler can form the outer muffler space.

[0018] According to one or more embodiments of the present disclosure, the refrigerant discharge passage may be formed on a side of the inner muffler facing the non-bonded outer convex portion of the outer muffler.

[0019] According to one or more embodiments of the present disclosure, the at least one refrigerant passage not communicating with the inner muffler space may be located in a non-mated outer convex portion of the outer muffler that is not coupled with a plurality of inner convex portions of the inner muffler.

[0020] According to one or more embodiments of the present disclosure, the inner muffler may further include a sub-coolant hole formed at a position corresponding to a non-mating outer convex portion of the outer muffler.

[0021] According to one or more embodiments of the present disclosure, the inner muffler may include first, second, and third inner convex portions. The outer muffler may include first, second, third, and fourth outer convex portions. When the inner muffler and the outer muffler are coupled, the first, second, and third inner convex portions are coupled to the first, second, and third outer convex portions, and the fourth outer convex portion may form the outer muffler space.

[0022] According to one or more embodiments of the present disclosure, the sum of the volume of the inner muffler space and the volume of the outer muffler space may be the rated volume.

[0023] The above-described and other aspects, features, and advantages of the embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings. In the accompanying drawings:

[0024] FIG. 1 is a perspective view illustrating a rotary compressor according to one or more embodiments of the present disclosure.

[0025] Fig. 2 is a cross-sectional view of the rotary compressor of Fig. 1 taken along line AA.

[0026] Fig. 3 is a cross-sectional view of the rotary compressor of Fig. 1 taken along line BB.

[0027] FIG. 4 is a perspective view showing a compression section of a rotary compressor according to one or more embodiments of the present disclosure.

[0028] Fig. 5 is a bottom view of the compression section of the rotary compressor of Fig. 4.

[0029] Fig. 6 is a cross-sectional view of the compression section of the rotary compressor of Fig. 4.

[0030] Fig. 7 is an exploded perspective view of the compression section of the rotary compressor of Fig. 4.

[0031] FIG. 8 is a perspective view showing an internal muffler used in a rotary compressor according to one or more embodiments of the present disclosure.

[0032] Fig. 9 is a perspective view of the internal muffler of Fig. 8 seen from above.

[0033] FIG. 10 is a perspective view showing an external muffler used in a rotary compressor according to one or more embodiments of the present disclosure.

[0034] Fig. 11 is a perspective view of the external muffler of Fig. 10 viewed from above.

[0035] FIG. 12 is a perspective view showing a state in which an internal muffler and an external muffler of a rotary compressor are combined according to one or more embodiments of the present disclosure.

[0036] Fig. 13 is a cross-sectional view of the lower muffler of Fig. 12 taken along line CC.

[0037] FIG. 14 is a perspective view showing an internal muffler of a rotary compressor according to one or more embodiments of the present disclosure.

[0038] FIG. 15 is a perspective view showing a state in which an internal muffler and an external muffler of a rotary compressor are combined according to one or more embodiments of the present disclosure.

[0039] FIG. 16 is a diagram showing the flow of refrigerant when a rotary compressor according to one or more embodiments of the present disclosure operates at low load.

[0040] FIG. 17 is a diagram showing the flow of refrigerant when a rotary compressor according to one or more embodiments of the present disclosure operates at high load.

[0041] FIG. 18 is a graph showing the flow rate of refrigerant passing through a plurality of refrigerant passages according to the operating conditions of a rotary compressor according to one or more embodiments of the present disclosure.

[0042] It should be understood that the various embodiments and terms used in this document are not intended to limit the technical features described in this document to specific embodiments, but rather include various modifications, equivalents, or alternatives of the embodiments.

[0043] In connection with the description of the drawings, similar reference numerals may be used for similar or related components.

[0044] The singular form of a noun corresponding to an item may include one or more of said items, unless the relevant context clearly indicates otherwise.

[0045] In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" may include any one of the items listed together in that phrase, or all possible combinations thereof.

[0046] The term "and / or" includes any combination of a plurality of related described elements or any one of a plurality of related described elements.

[0047] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish one component from another and do not qualify the components in any other respect (e.g., importance or order).

[0048] When a component (e.g., a first component) is referred to as being "coupled" or "connected" to another component (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0049] The terms "include" or "have" are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in this document, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0050] When a component is said to be “connected,” “coupled,” “supported,” or “in contact with” another component, this includes not only cases where the components are directly connected, coupled, supported, or in contact, but also cases where the components are indirectly connected, coupled, supported, or in contact through a third component.

[0051] When we say that a component is "on" another component, this includes not only cases where the component is in contact with the other component, but also cases where there is another component between the two components.

[0052] In addition, terms such as 'front end', 'rear end', 'upper end', 'lower end', 'top end', and 'bottom end' used in the present disclosure are defined based on the drawings, and the shape and position of each component are not limited by these terms.

[0053] Hereinafter, a rotary compressor (1) according to one or more embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0054] Fig. 1 is a perspective view showing a rotary compressor (1) according to one embodiment of the present disclosure.

[0055] Referring to FIG. 1, a rotary compressor (1) according to one embodiment of the present disclosure may include a casing (10).

[0056] The casing (10) forms the exterior of the rotary compressor (1). The casing (10) is formed as a sealed container. The casing (10) may include a refrigerant inlet (13) through which refrigerant is introduced and a refrigerant discharge pipe (14) through which refrigerant is discharged.

[0057] A rotary compressor (1) can form a refrigeration cycle together with a condenser, an expansion valve, and an evaporator. In this case, a refrigerant inlet (13) can be connected to the evaporator, and a refrigerant discharge pipe (14) can be connected to the condenser.

[0058] An accumulator (3) may be installed on one side of the rotary compressor (1). That is, the accumulator (3) may be installed on the outer surface of the casing (10). In this case, the refrigerant inlet (13) may be connected to the accumulator (3). Since the inlet pipe of the accumulator (3) is connected to the evaporator, the refrigerant discharged from the evaporator may be introduced into the rotary compressor (1) through the accumulator (3).

[0059] The casing (10) may include an upper casing (11) and a lower casing (12). The upper casing (11) is joined to the upper end of the lower casing (12) to form the casing (10).

[0060] The joint between the upper casing (11) and the lower casing (12) is sealed.

[0061] A refrigerant discharge pipe (14) is provided in the upper casing (11). The refrigerant discharge pipe (14) can be provided at the top of the upper casing (11).

[0062] A refrigerant inlet (13) is provided in the lower casing (12). The refrigerant inlet (13) is connected to a compression unit (40) installed inside the lower casing (12). Low-temperature / low-pressure refrigerant can be introduced into the refrigerant inlet (13). Therefore, the refrigerant can be introduced into the compression unit (40) through the refrigerant inlet (13).

[0063] An accumulator (3) may be installed in the lower casing (12). In this case, the refrigerant inlet (13) may be connected to the discharge pipe of the accumulator (3).

[0064] A base (15) supporting the casing (10) may be provided at the bottom of the lower casing (12). The rotary compressor (1) may be installed vertically with respect to the support surface by the base (15).

[0065] Fig. 2 is a cross-sectional view of the rotary compressor (1) of Fig. 1 taken along line AA. Fig. 3 is a cross-sectional view of the rotary compressor (1) of Fig. 1 taken along line BB.

[0066] Referring to FIGS. 2 and 3, a rotary compressor (1) according to one embodiment of the present disclosure may include a casing (10), a motor (20), and a compression unit (40).

[0067] The casing (10) forms the exterior of the rotary compressor (1) and may be formed as a cylindrical sealed container. The casing (10) may include a lower casing (12) provided with a refrigerant inlet (13) and an upper casing (11) provided with a refrigerant discharge pipe (14).

[0068] The casing (10) is formed by combining the upper casing (11) and the lower casing (12), and the interior of the casing (10) can be sealed except for the refrigerant inlet (13) and the refrigerant discharge pipe (14). That is, the refrigerant can only flow into the interior of the casing (10) through the refrigerant inlet (13), and can only be discharged from the casing (10) to the outside through the refrigerant discharge pipe (14).

[0069] The internal space of the casing (10) can accommodate high-pressure refrigerant discharged from the compression unit (40). The refrigerant in the internal space of the casing (10) is discharged to the outside through the refrigerant discharge pipe (14).

[0070] An oil storage tank (16) for containing oil may be provided at the bottom of the casing (10).

[0071] An accumulator (3) may be installed on the outer surface of the casing (10). At this time, the refrigerant inlet (13) may be connected to the discharge pipe of the accumulator (3).

[0072] The motor (20) can be placed on the upper side inside the casing (10). The motor (20) includes a stator (21) and a rotor (22).

[0073] The stator (21) of the motor (20) is fixed to the inner surface of the casing (10). A plurality of oil return passages may be provided between the outer surface of the stator (21) and the inner surface of the casing (10). The plurality of oil return passages may be formed at regular intervals along the outer surface of the stator (21).

[0074] Oil from the upper side of the motor (20) can move to the lower side of the motor (20) through a plurality of oil return passages provided between the stator (21) and the casing (10). Oil that has moved to the lower side of the motor (20) can be collected in an oil storage tank (16) provided at the lower side of the casing (10).

[0075] The rotor (22) can be rotatably arranged at the center of the stator (21). The rotor (22) is installed so as to maintain a certain gap with the inner surface of the stator (21).

[0076] A shaft hole (29) may be provided at the center of the rotor (22) so as to penetrate the rotor (22) in the longitudinal direction. A plurality of refrigerant holes (27) may be provided around the shaft hole (29) of the rotor (22). The plurality of refrigerant holes (27) may be formed so as to penetrate the rotor (22) in the longitudinal direction, i.e., in the up-down direction.

[0077] The refrigerant discharged from the compression section (40) at the bottom of the motor (20) can move to the upper part of the motor (20) through the gap between the rotor (22) and the stator (21) and the plurality of refrigerant holes (27).

[0078] The drive shaft (30) is inserted into and fixed in a shaft hole (29) that penetrates the center of the rotor (22). Therefore, when power is applied to the motor (20), the rotor (22) can rotate by the electromagnetic force acting between the stator (21) and the rotor (22). When the rotor (22) rotates, the drive shaft (30) can rotate integrally with the rotor (22).

[0079] When the drive shaft (30) is rotated by the motor (20), the compression unit (40) operates to compress the refrigerant.

[0080] The drive shaft (30) may be formed to extend downward from the motor (20). The lower portion of the drive shaft (30) extending downward from the motor (20) may be connected to the compression unit (40). The lower portion of the drive shaft (30) may be formed as a crank shaft to operate the compression unit (40).

[0081] The crankshaft of the drive shaft (30) may include two eccentric parts, i.e., an upper eccentric part (31) and a lower eccentric part (32). Therefore, when the drive shaft (30) rotates, the upper eccentric part (31) and the lower eccentric part (32) of the crankshaft rotate integrally with the drive shaft (30).

[0082] The upper eccentric portion (31) is formed in a cylindrical shape with a diameter larger than the diameter of the driving shaft (30), and its center line can be arranged to be eccentric with the center line of the driving shaft (30). An upper roller (33) can be installed around the periphery of the upper eccentric portion (31). That is, the upper eccentric portion (31) can be inserted into the upper roller (33).

[0083] The lower eccentric portion (32) is installed below the upper eccentric portion (31) and may be formed in the same manner as the upper eccentric portion (31). That is, the lower eccentric portion (32) may be formed in a cylindrical shape with a diameter larger than the diameter of the driving shaft (30), and its center line may be arranged to be eccentric with the center line of the driving shaft (30). A lower roller (34) may be installed around the periphery of the lower eccentric portion (32). That is, the lower eccentric portion (32) may be inserted into the lower roller (34).

[0084] The lower eccentric portion (32) may be formed to be eccentric in a different direction from the upper eccentric portion (31) with respect to the center line of the drive shaft (30). For example, the lower eccentric portion (32) may be eccentric in a direction approximately 180 degrees opposite to the upper eccentric portion (31) with respect to the center line of the drive shaft (30).

[0085] The drive shaft (30) can be rotatably supported by the upper flange (91) and the lower flange (92).

[0086] The upper flange (91) is installed to be fixed to the inner surface of the casing (10) below the motor (20). The upper flange (91) is installed above the upper eccentric member (31). That is, the upper flange (91) can be installed to support the drive shaft (30) between the motor (20) and the upper eccentric member (31).

[0087] The lower flange (92) can be installed to support the lower end of the drive shaft (30) below the lower eccentric portion (32). The lower flange (92) can be fixed to the upper flange (91).

[0088] The compression unit (40) is installed below the motor (20). The compression unit (40) can be formed to compress the refrigerant according to the rotation of the drive shaft (30) and discharge the compressed refrigerant to the upper side of the compression unit (40).

[0089] Hereinafter, the compression unit (40) of the rotary compressor (1) according to one embodiment of the present disclosure will be described in detail with reference to FIGS. 4 to 7.

[0090] Fig. 4 is a perspective view showing a compression section (40) of a rotary compressor (1) according to one embodiment of the present disclosure. Fig. 5 is a bottom view of the compression section (40) of the rotary compressor (1) of Fig. 4. Fig. 6 is a cross-sectional view of the compression section (40) of the rotary compressor (1) of Fig. 4. Fig. 7 is an exploded perspective view of the compression section (40) of the rotary compressor (1) of Fig. 4.

[0091] The compression unit (40) is installed at the bottom of the casing (10) and is formed to be operated by a drive shaft (30) that rotates by a motor (20) to suck in, compress, and discharge the refrigerant.

[0092] Referring to FIGS. 4 to 7, the compression member (40) can be installed between the upper flange (91) and the lower flange (92) that rotatably support the drive shaft (30).

[0093] The compression section (40) may include an upper compression section (41), a lower compression section (42), and an intermediate plate (70) provided between the upper compression section (41) and the lower compression section (42).

[0094] The upper compression section (41) is formed so as to be able to suck and compress refrigerant according to the rotation of the drive shaft (30). The lower compression section (42) is provided below the upper compression section (41) and is formed so as to be able to suck and compress refrigerant according to the rotation of the drive shaft (30).

[0095] The upper compression member (41) is installed on the upper surface of the middle plate (70) and may include an upper cylinder (50) having a flat plate shape. The upper cylinder (50) may include a compression chamber. The compression chamber may be formed as a hollow (51) having a circular cross-section.

[0096] The upper roller (33) installed on the upper eccentric portion (31) of the drive shaft (30) can be accommodated in the hollow portion (51) of the upper cylinder (50) and rotate.

[0097] The upper compression section (41) may include a refrigerant inlet passage (52) connected to a refrigerant inlet port (13) provided in the casing (10). The refrigerant inlet passage (52) is formed in the upper cylinder (50).

[0098] The refrigerant inlet passage (52) may be formed as a through hole that connects the hollow portion (51) of the upper cylinder (50) and the outer circumference. Accordingly, the refrigerant may be introduced into the hollow portion (51) of the upper cylinder (50) through the refrigerant inlet port (13) and the refrigerant inlet passage (52).

[0099] The upper compression unit (41) may include an upper discharge port (501) through which compressed refrigerant is discharged. The upper discharge port (501) may be provided on the upper surface of the upper cylinder (50).

[0100] When the upper roller (33) rotates by the drive shaft (30), the refrigerant flows into the hollow space (51) of the upper cylinder (50) through the refrigerant inlet passage (52), is compressed by the upper roller (33), and can then be discharged through the upper discharge port (501).

[0101] The lower compression member (42) is installed on the lower surface of the intermediate plate (70) and may include a lower cylinder (60) having a flat plate shape. The lower cylinder (60) may include a compression chamber. The compression chamber may be formed as a hollow cavity (61) having a circular cross-section.

[0102] The lower roller (34) installed on the lower eccentric portion (32) of the drive shaft (30) can be installed to be received and rotated in the hollow portion (61) of the lower cylinder (60).

[0103] The lower compression section (42) may include a refrigerant inlet passage (62) connected to a refrigerant inlet port (13) provided in the casing (10). The refrigerant inlet passage (62) is formed in the lower cylinder (60).

[0104] The refrigerant inlet passage (62) may be formed as a through hole that connects the hollow portion (61) of the lower cylinder (60) and the outer circumference. Accordingly, the refrigerant may be introduced into the hollow portion (61) of the lower cylinder (60) through the refrigerant inlet port (13) and the refrigerant inlet passage (62).

[0105] The lower compression unit (42) may include a lower discharge port through which compressed refrigerant is discharged. The lower discharge port may be provided on the lower surface of the lower cylinder (60). Accordingly, the refrigerant compressed by the lower compression unit (42) may be discharged downward from the lower compression unit (42) through the lower discharge port.

[0106] When the lower roller (34) is rotated by the drive shaft (30), the refrigerant flows into the hollow space (61) of the lower cylinder (60) through the refrigerant inlet passage (62), is compressed by the lower roller (34), and can then be discharged through the lower discharge port.

[0107] Low-pressure refrigerant can be supplied to the upper compression unit (41) and the lower compression unit (42) through the accumulator (3).

[0108] The intermediate plate (70) is installed between the upper cylinder (50) and the lower cylinder (60). The intermediate plate (70) may be formed in a flat plate shape. Accordingly, the lower cylinder (60), the intermediate plate (70), and the upper cylinder (50) may be laminated to form a compression member (40). The lower cylinder (60), the intermediate plate (70), and the upper cylinder (50) may be integrally joined by a plurality of bolts (93).

[0109] An upper flange (91) may be installed on the upper surface of the upper cylinder (50). The upper flange (91) may be fixed to the inner circumferential surface of the casing (10). Therefore, by fixing the upper cylinder (50) to the upper flange (91), the upper cylinder (50) may be fixed to the casing (10).

[0110] The upper flange (91) rotatably supports the drive shaft (30) and can be formed to cover the upper portion of the hollow portion (51) of the upper cylinder (50).

[0111] The upper flange (91) may be provided with an upper discharge port (914) that communicates with the upper discharge port (501) of the upper cylinder (50). Accordingly, the refrigerant discharged through the upper discharge port (501) of the upper cylinder (50) may be discharged to the upper side of the upper flange (91) through the upper discharge port (914) of the upper flange (91).

[0112] The upper flange (91) may include an upper discharge valve (911) that opens and closes an upper discharge port (914). Accordingly, the upper discharge port (914) of the upper flange (91) may be opened and closed by the upper discharge valve (911). When the refrigerant introduced into the upper cylinder (50) is compressed, the upper discharge valve (911) may be opened so that the refrigerant may be discharged to the upper side of the upper flange (91).

[0113] An upper muffler (80) may be installed on the upper side of the upper flange (91). The upper muffler (80) is formed to reduce noise generated by refrigerant discharged through the upper discharge hole (914) of the upper flange (91).

[0114] The upper flange (91) may include a plurality of bolt holes (912) provided along the circumference of the upper flange (91).

[0115] The upper flange (91) may include a plurality of refrigerant holes (913) provided along the circumferential direction. The refrigerant discharged from the lower cylinder (60) may flow to the upper side of the upper flange (91) through the plurality of refrigerant holes (913).

[0116] The upper muffler (80) may include a plurality of refrigerant openings (81) through which refrigerant may pass. The refrigerant passing through the upper flange (91) may be discharged into the space between the motor (20) and the compression unit (40) through the plurality of refrigerant openings (81) of the upper muffler (80).

[0117] The upper muffler (80) may be provided with a plurality of bolt holes (82) corresponding to the plurality of bolt holes (912) of the upper flange (91) along the edge.

[0118] A plurality of openings (95) may be provided at the edge of the upper flange (91). The plurality of openings (95) may be formed around the periphery of the upper muffler (80) installed on the upper flange (91). The plurality of openings (95) may be formed to vertically penetrate the upper flange (91). Oil may flow to the oil reservoir (16) at the bottom of the casing (10) through the plurality of openings (95).

[0119] The upper flange (91) may include an upper flange portion (915), an upper boss (916), and an upper bearing (917).

[0120] The upper flange portion (915) may be formed in a circular shape. The upper flange portion (915) is formed so as to cover the opening (51) of the upper cylinder (50). The upper flange portion (915) may be formed to have a diameter corresponding to the inner surface of the casing (10). Accordingly, the upper flange (91) may be fixed to the inner surface of the casing (10).

[0121] The upper flange portion (915) may include an upper discharge port (914) that communicates with the upper discharge port (501) of the upper cylinder (50). Accordingly, the refrigerant discharged through the upper discharge port (501) of the upper cylinder (50) may be discharged to the upper side of the upper flange portion (915) through the upper discharge port (914) of the upper flange portion (915).

[0122] An upper discharge valve (911) may be provided in the upper discharge hole (914) of the upper flange portion (915). Accordingly, the upper discharge hole (914) of the upper flange portion (915) may be opened and closed by the upper discharge valve (911). When the refrigerant introduced into the upper cylinder (50) is compressed above a certain pressure, the upper discharge valve (911) may be opened so that the refrigerant may be discharged to the upper side of the upper flange portion (915).

[0123] The upper boss (916) may extend vertically from the center of the upper flange portion (915). The upper boss (916) may extend vertically upward from the upper flange portion (915). A through hole may be formed in the center of the upper boss (916).

[0124] The upper bearing (917) is installed in the through hole of the upper boss (916) and rotatably supports the drive shaft (30). Any type of bearing can be used as the upper bearing (917) as long as it can rotatably support the drive shaft (30). In the present disclosure, a sliding bearing is used as the upper bearing (917).

[0125] A plurality of bolt holes (912) and a plurality of refrigerant holes (913) may be provided in the upper flange portion (915) around the upper boss (916). A plurality of openings (95) may be provided at the edge of the upper flange portion (915) outside the plurality of bolt holes (912).

[0126] The upper cylinder (50) may be provided with a plurality of tap holes (502) corresponding to a plurality of bolt holes (912) of the upper flange portion (915). In addition, the upper cylinder (50) may include a plurality of refrigerant holes (503) corresponding to a plurality of refrigerant holes (913) of the upper flange (91).

[0127] When a plurality of bolts (94) are fastened to a plurality of tap holes (502) of the upper cylinder (50), the upper muffler (80) and the upper flange (91) can be fixed to the upper cylinder (50) by the plurality of bolts (94).

[0128] The refrigerant discharged through the upper discharge hole (914) of the upper flange (91) can pass through the inside of the upper muffler (80) with reduced noise, and then be discharged through the plurality of refrigerant openings (81) of the upper muffler (80) into the upper side of the upper muffler (80), i.e., the space between the motor (20) and the compression unit (40).

[0129] A lower flange (92) may be installed on the lower surface of the lower cylinder (60). The lower flange (92) rotatably supports the lower portion of the drive shaft (30) and may be formed to cover the lower portion of the hollow portion (61) of the lower cylinder (60).

[0130] The lower flange (92) may be provided with a discharge hole (924) that communicates with the lower discharge port of the lower cylinder (60). Accordingly, the refrigerant discharged through the lower discharge port of the lower cylinder (60) may be discharged to the lower side of the lower flange (92) through the discharge hole (924) of the lower flange (92).

[0131] The lower flange (92) may include a discharge valve (921) that opens and closes the discharge hole (924). Accordingly, the discharge hole (924) of the lower flange (92) may be opened and closed by the discharge valve (921). When the refrigerant introduced into the lower cylinder (60) is compressed above a certain pressure, the discharge valve (921) may open so that the refrigerant may be discharged to the lower side of the lower flange (92).

[0132] A lower muffler (100) may be installed on the lower side of the lower flange (92). The lower muffler (100) forms a space that receives refrigerant discharged from the discharge hole (924) of the lower flange (92).

[0133] The lower muffler (100) is formed to reduce noise generated by refrigerant discharged through the discharge hole (924) of the lower flange (92). The lower muffler (100) may be formed to allow the internal volume of the lower muffler (100) to change depending on the load applied to the rotary compressor (1).

[0134] Additionally, the lower muffler (100) can be formed so that the refrigerant discharged through the discharge hole (924) of the lower flange (92) is not discharged below the lower muffler (100).

[0135] The lower flange (92) may include a plurality of first bolt holes (922) provided along the circumference of the lower flange (92).

[0136] The lower flange (92) may include a plurality of refrigerant holes (923) provided along the circumferential direction. The refrigerant discharged from the discharge hole (924) of the lower flange (92) may flow to the upper side of the lower flange (92) by the lower muffler (100) and the plurality of refrigerant holes (923).

[0137] Specifically, the plurality of refrigerant holes (923) of the lower flange (92) can be formed to match the plurality of refrigerant holes (603) of the lower cylinder (60), the plurality of refrigerant holes (703) of the middle plate (70), the plurality of refrigerant holes (503) of the upper cylinder (50), and the plurality of refrigerant holes (913) of the upper flange (91).

[0138] A plurality of refrigerant holes (923) of the lower flange (92) can be communicated with the discharge hole (924) by the lower muffler (100).

[0139] Accordingly, the refrigerant discharged from the discharge hole (924) of the lower flange (92) can move to the plurality of refrigerant holes (923) of the lower flange (92) by the lower muffler (100). The refrigerant introduced into the plurality of refrigerant holes (923) of the lower flange (92) can move to the space formed by the upper flange (91) and the upper muffler (80) through the plurality of refrigerant holes (603) of the lower cylinder (60), the plurality of refrigerant holes (703) of the middle plate (70), the plurality of refrigerant holes (503) of the upper cylinder (50), and the plurality of refrigerant holes (913) of the upper flange (91).

[0140] Accordingly, the plurality of refrigerant holes (923) of the lower flange (92) that are connected in the vertical direction, the plurality of refrigerant holes (603) of the lower cylinder (60), the plurality of refrigerant holes (703) of the middle plate (70), the plurality of refrigerant holes (503) of the upper cylinder (50), and the plurality of refrigerant holes (913) of the upper flange (91) form a plurality of refrigerant passages (PF1, PF2, PF3) through which the refrigerant discharged from the lower compression section (42) moves to the space of the upper muffler (80). That is, one refrigerant passage (PF1, PF2, PF3) is formed by a refrigerant hole (923) of a lower flange (92) arranged in a straight line, a refrigerant hole (603) of a lower cylinder (60), a refrigerant hole (703) of a middle plate (70), a refrigerant hole (503) of an upper cylinder (50), and a refrigerant hole (913) of an upper flange (91).

[0141] A plurality of refrigerant passages (PF1, PF2, PF3) may be arranged in the direction of flow of refrigerant discharged from the discharge hole (924). In the present embodiment, the refrigerant passage closest to the discharge hole (924) may be referred to as the first refrigerant passage (PF1), and the refrigerant passage farthest from the discharge hole (924) may be referred to as the third refrigerant passage (PF3). The refrigerant passage located between the first refrigerant passage (PF1) and the third refrigerant passage (PF3) may be referred to as the second refrigerant passage (PF2).

[0142] The refrigerant in the space between the upper flange (91) and the upper muffler (80) can move to the upper side of the upper muffler (80) through the plurality of openings (81) of the upper muffler (80).

[0143] The lower muffler (100) does not include an opening or hole through which the refrigerant can be discharged. Therefore, the refrigerant discharged through the discharge hole (924) of the lower flange (92) may not be discharged below the compression section (40) through the lower muffler (100).

[0144] The lower flange (92) may include a flange portion (925), a boss (926), and a bearing (927).

[0145] The flange portion (925) may be formed in a circular shape. The flange portion (925) is formed so as to cover the opening (61) of the lower cylinder (60). The flange portion (925) may be formed in a size corresponding to the lower cylinder (60).

[0146] The flange portion (925) may include a discharge hole (924) that communicates with the lower discharge port of the lower cylinder (60). Accordingly, the refrigerant discharged through the lower discharge port of the lower cylinder (60) may be discharged downward through the discharge hole (924) of the flange portion (925).

[0147] A discharge valve (921) may be provided in the discharge hole (924) of the flange portion (925). Accordingly, the discharge hole (924) of the flange portion (925) may be opened and closed by the discharge valve (921). When the refrigerant introduced into the lower cylinder (60) is compressed above a certain pressure, the discharge valve (921) may be opened so that the refrigerant may be discharged to the lower side of the flange portion (925).

[0148] The boss (926) may extend vertically from the center of the flange portion (925). The boss (926) may extend vertically downward from the flange portion (925). A through hole may be formed in the center of the boss (926).

[0149] A bearing (927) is installed in the through hole of the boss (926) and rotatably supports the drive shaft (30). Therefore, the drive shaft (30) can be rotatably supported by the bearing (927) and the upper bearing (917). Any type of bearing can be used as the bearing (927) as long as it can rotatably support the drive shaft (30). In the present disclosure, a sliding bearing is used as the bearing (927).

[0150] A plurality of first bolt holes (922) and a plurality of refrigerant holes (923) can be provided in the flange portion (925) around the boss (926).

[0151] The lower cylinder (60) may be provided with a plurality of bolt holes (602) corresponding to the plurality of first bolt holes (922) of the flange portion (925). In addition, the lower cylinder (60) may include a plurality of refrigerant holes (603) corresponding to the plurality of refrigerant holes (923) of the lower flange (92).

[0152] A lower muffler (100) may be installed on the lower surface of the flange portion (925) of the lower flange (92). The lower muffler (100) may be formed so that the volume of the internal space where the refrigerant is accommodated changes depending on the load applied to the rotary compressor (1).

[0153] The lower muffler (100) may include an inner muffler (110) and an outer muffler (120). The inner muffler (110) and the outer muffler (120) may be combined to form the lower muffler (100). That is, when the inner muffler (110) is installed inside the outer muffler (120), the lower muffler (100) may be formed.

[0154] The internal muffler (110) is installed on the lower surface of the compression unit (40) and can be formed to form an internal muffler space that is not connected to at least one of the plurality of refrigerant passages (PF1, PF2, PF3) and is connected to the remaining refrigerant passages.

[0155] An external muffler (120) is installed below the internal muffler (110) and can form an external muffler space that is connected to at least one refrigerant passage that is not connected to the internal muffler space.

[0156] A refrigerant discharge passage (119) may be provided between the inner muffler (110) and the outer muffler (120). The refrigerant discharge passage (119) is provided in a portion of the inner muffler (110) that is in contact with the outer muffler space, and may be formed so that the refrigerant in the inner muffler space can be selectively discharged to the outer muffler space depending on the flow rate of the refrigerant discharged from the lower surface of the compression unit (40).

[0157] Hereinafter, the lower muffler (100) will be described in detail with reference to FIGS. 8 to 13.

[0158] FIG. 8 is a perspective view showing an inner muffler (110) used in a rotary compressor (1) according to one or more embodiments of the present disclosure. FIG. 9 is a perspective view showing the inner muffler (110) of FIG. 8 as seen from above. FIG. 10 is a perspective view showing an outer muffler (120) used in a rotary compressor (1) according to one or more embodiments of the present disclosure. FIG. 11 is a perspective view showing the outer muffler (120) of FIG. 10 as seen from above. FIG. 12 is a perspective view showing a state in which the inner muffler (110) and the outer muffler (120) of a rotary compressor (1) according to one or more embodiments of the present disclosure are combined. FIG. 13 is a cross-sectional view of the lower muffler (100) of FIG. 12 taken along line CC.

[0159] Referring to FIGS. 8 and 9, the inner muffler (110) may be formed in a roughly dome shape. The inner muffler (110) may include a plurality of inner convex portions (111, 112, 113) formed at regular intervals along the circumference of the inner muffler (110) on the side surface of the inner muffler (110).

[0160] Specifically, the internal muffler (110) may be formed in a shape including a dome portion that protrudes downwards from the central portion of the disk in a roughly dome shape. A plurality of internal convex portions (111, 112, 113) may be formed on the side surfaces of the dome portion.

[0161] Additionally, the inner muffler (110) may include a plurality of second bolt holes (118) formed at regular intervals along the edge. The plurality of second bolt holes (118) may be formed to correspond to the plurality of first bolt holes (922) of the lower flange (92).

[0162] Additionally, the inner muffler (110) may include a sub-coolant hole (1101). The sub-coolant hole (1101) may be formed between a plurality of second bolt holes (118).

[0163] For example, the inner muffler (110) may include an inner fixing plate (115) and an inner dome portion (116).

[0164] The inner fixing plate (115) may be formed in a roughly ring shape. The inner fixing plate (115) may include an outer circumferential surface formed in a circular shape and an inner circumferential surface concentric with the outer circumferential surface and having a smaller diameter. The inner circumferential surface of the inner fixing plate (115) may include a plurality of internal concave portions. The plurality of internal concave portions may be formed concavely from the inner circumferential surface of the inner fixing plate (115) toward the outer circumferential surface. The plurality of internal concave portions may be formed to correspond to the plurality of internal convex portions (111, 112, 113) of the inner dome portion (116). Each of the plurality of internal concave portions may be formed in a curve corresponding to the plurality of internal convex portions (111, 112, 113) of the inner dome portion (116).

[0165] The inner fixing plate (115) may be fixed to the flange portion (925) of the lower flange (92). The inner fixing plate (115) may include a plurality of second bolt holes (118). The plurality of second bolt holes (118) may be formed to correspond to the plurality of first bolt holes (922) of the lower flange (92). Some of the plurality of second bolt holes (118) may be formed between the plurality of inner convex portions (111, 112, 113). In the present embodiment, two second bolt holes (118) are formed between three inner convex portions (111, 112, 113).

[0166] The inner muffler (110) may include a sub-coolant hole (1101). The sub-coolant hole (1101) may be formed in the inner fixed plate (115). The sub-coolant hole (1101) may be formed between a plurality of second bolt holes (118).

[0167] The sub-refrigerant hole (1101) may be formed to communicate with one of the plurality of refrigerant passages (PF1, PF2, PF3) when the internal muffler (110) is installed on the lower surface of the lower flange (92), i.e., the lower surface of the compression section (40). Specifically, the sub-refrigerant hole (1101) may be formed to coincide with one of the plurality of refrigerant holes (923) of the lower flange (92).

[0168] The inner muffler (110) may include at least one sub-refrigerant hole (1101). In the present embodiment, the inner muffler (110) includes one sub-refrigerant hole (1101), but the present disclosure is not limited thereto. The inner muffler (110) according to one or more embodiments of the present disclosure may include two or more sub-refrigerant holes (1101).

[0169] The inner dome portion (116) may be formed to extend downward from the inner circumference of the inner fixing plate (115). The inner dome portion (116) may be formed to protrude in a roughly dome shape from the lower surface of the inner fixing plate (115). A plurality of inner convex portions (111, 112, 113) may be formed at regular intervals in the circumferential direction on the side surface of the inner dome portion (116). The plurality of inner convex portions (111, 112, 113) may be formed as a curved surface that protrudes toward the outside of the inner dome portion (116).

[0170] As illustrated in FIGS. 8 and 9, a plurality of internal convex portions (111, 112, 113) may protrude from the internal dome portion (116) toward the outer circumference of the internal fixing plate (115). Accordingly, the internal space of the internal dome portion (116) may be formed concavely and convexly. The internal space of the internal dome portion (116) may form an internal muffler space in which refrigerant is accommodated.

[0171] The plurality of internal convex portions (111, 112, 113) can be formed to correspond to the discharge hole (924) and the plurality of refrigerant passages (PF1, PF2, PF3) of the compression unit (40). Specifically, when the internal muffler (110) is installed on the lower surface of the lower flange (92), the plurality of internal convex portions (111, 112, 113) can be formed so that the plurality of internal convex portions (111, 112, 113) can cover the discharge hole (924) and the plurality of refrigerant holes (923) of the lower flange (92). Accordingly, some of the plurality of refrigerant passages (PF1, PF2, PF3) of the compression unit (40) that communicate with the internal muffler space can be located in the plurality of internal convex portions (111, 112, 113). Additionally, the discharge hole (924) of the compression member (40) can be positioned to correspond to one of the plurality of internal convex portions (111, 112, 113).

[0172] For example, the internal muffler (110) may be formed so that the internal muffler space formed by the plurality of internal convex portions (111, 112, 113) communicates with two refrigerant passages (PF1, PF2) adjacent to the discharge hole (924) in the direction of flow of the refrigerant discharged from the discharge hole (924) among the three refrigerant passages. In addition, the internal muffler (110) may be formed so as not to communicate with a refrigerant passage (PF3) that is far from the discharge hole (924) in the direction of flow of the refrigerant.

[0173] A through hole (117) may be provided at the bottom of the inner dome portion (116). A boss (926) of the lower flange (92) may be inserted into the through hole (117) of the inner dome portion (116). Accordingly, the refrigerant discharged from the discharge hole (924) of the lower flange (92) may be accommodated in the internal muffler space formed by the inner dome portion (116) and the boss (926) of the lower flange (92).

[0174] The inner muffler (110) may include a refrigerant discharge passage (119). The refrigerant discharge passage (119) may be formed in the inner dome portion (116). The refrigerant discharge passage (119) may be formed in a portion of the inner dome portion (116) where the plurality of inner convex portions (111, 112, 113) are not formed.

[0175] The refrigerant discharge passage (119) may be formed to selectively allow refrigerant to pass therethrough depending on the pressure of the internal space of the inner muffler (110). In other words, the refrigerant discharge passage (119) may be formed to selectively allow refrigerant in the internal muffler space to be discharged to the outside of the inner muffler (110) depending on the flow rate of refrigerant discharged from the discharge hole (924) of the lower flange (92). For example, if a large flow rate of refrigerant is discharged from the discharge hole (924), the refrigerant may be discharged to the outside of the inner muffler (110) through the refrigerant discharge passage (119). If the flow rate of refrigerant discharged from the discharge hole (924) is small, the refrigerant may not be discharged to the outside of the inner muffler (110) through the refrigerant discharge passage (119).

[0176] The refrigerant discharge passage (119) may be formed by a plurality of holes (1191) in the inner dome portion (116) of the inner muffler (110). The plurality of holes (1191) may be formed with a perforation ratio of 20% to 80%. The perforation ratio may be determined based on the area (IA) of the inner dome portion (116) corresponding to the non-bonded outer convex portion (124) of the outer muffler (120).

[0177] The upper end of the inner muffler (110) may be formed so as not to protrude above the lower surface of the lower flange (92). Specifically, the inner fixing plate (115) of the inner muffler (110) may not protrude above the lower surface of the flange portion (925) of the lower flange (92), but may be positioned below it. That is, the upper surface of the inner fixing plate (115) of the inner muffler (110) may be in contact with the lower surface of the flange portion (925) of the lower flange (92).

[0178] The upper surface of the inner fixing plate (115) of the inner muffler (110) may be formed so as not to come into contact with the side surface of the flange portion (925) of the lower flange (92). If the inner fixing plate (115) does not come into contact with the side surface of the flange portion (925) of the lower flange (92), pressure by the inner muffler (110) may not be applied to the bearing (927) installed in the lower flange (92). In other words, the inner muffler (110) may be formed as a flat muffler.

[0179] The outer muffler (120) can be formed in a shape corresponding to the inner muffler (110).

[0180] Referring to FIGS. 10 and 11, the external muffler (120) may be formed in a roughly dome shape. The external muffler (120) may include a plurality of external convex portions (121, 122, 123, 124) formed at regular intervals along the circumferential direction of the external muffler (120) on the side surface of the external muffler (120).

[0181] Specifically, the external muffler (120) may be formed in a shape including a dome portion that protrudes downward from the center of the disk in a roughly dome shape. A plurality of external convex portions (121, 122, 123, 124) may be formed on the side surfaces of the dome portion.

[0182] Additionally, the outer muffler (120) may include a plurality of third bolt holes (128) formed at regular intervals along the edge. The plurality of third bolt holes (128) may be formed to correspond to the plurality of first bolt holes (922) of the lower flange (92).

[0183] For example, the external muffler (120) may include an external fixing plate (125) and an external dome portion (126).

[0184] The outer fixing plate (125) may be formed in a roughly ring shape. The outer fixing plate (125) may include an outer circumferential surface formed in a circular shape and an inner circumferential surface concentric with the outer circumferential surface and having a small diameter. The inner circumferential surface of the outer fixing plate (125) may include a plurality of outer concave portions. The plurality of outer concave portions may be formed concavely from the inner circumferential surface of the outer fixing plate (125) toward the outer circumferential surface. The plurality of outer concave portions may be formed to correspond to the plurality of outer convex portions (121, 122, 123, 124) of the outer dome portion (126). Each of the plurality of outer concave portions may be formed in a curve corresponding to the plurality of outer convex portions (121, 122, 123, 124) of the outer dome portion (126).

[0185] The outer fixing plate (125) of the outer muffler (120) can be formed in a shape corresponding to the inner fixing plate (115) of the inner muffler (110).

[0186] The outer fixing plate (125) may be fixed to the flange portion (925) of the lower flange (92). The outer fixing plate (125) may include a plurality of third bolt holes (128). The plurality of third bolt holes (128) may be formed to correspond to the plurality of second bolt holes (118) of the inner fixing plate (115) of the inner muffler (110). Some of the plurality of third bolt holes (128) may be formed between the plurality of outer convex portions (121, 122, 123, 124). In the present embodiment, three third bolt holes (128) are formed between four outer convex portions (121, 122, 123, 124).

[0187] The outer dome portion (126) may be formed to extend downward from the inner circumference of the outer fixing plate (125). The outer dome portion (126) may be formed to protrude in a roughly dome shape from the lower surface of the outer fixing plate (125). A plurality of outer convex portions (121, 122, 123, 124) (721) may be formed at regular intervals in the circumferential direction on the side surface of the outer dome portion (126). The plurality of outer convex portions (121, 122, 123, 124) may be formed as a curved surface that protrudes toward the outside of the outer dome portion (126).

[0188] As illustrated in FIGS. 10 and 11, a plurality of external convex portions (121, 122, 123, 124) may protrude from the external dome portion (126) toward the outer circumferential surface of the external fixing plate (125). Accordingly, the internal space of the external dome portion (126) may be formed concavely and convexly. The internal space of the external dome portion (126) may form an external muffler space in which refrigerant is accommodated.

[0189] The plurality of outer convex portions (121, 122, 123, 124) can be formed to be coupled with the plurality of inner convex portions (111, 112, 113) of the inner muffler (110). For example, when the outer muffler (120) and the inner muffler (110) are coupled, the plurality of inner convex portions (111, 112, 113) of the inner muffler (110) can be coupled with the plurality of outer convex portions (121, 122, 123, 124) of the outer muffler (120). Specifically, the inner convex portion (111, 112, 113) of the inner muffler (110) is inserted into the outer convex portion (121, 122, 123, 124) of the outer muffler (120), so that the outer surface of the inner convex portion (111, 112, 113) can contact or be adjacent to the inner surface of the outer convex portion (121, 122, 123).

[0190] The number of the plurality of outer convex portions (121, 122, 123, 124) of the outer muffler (120) can be formed at least by one more than the number of the plurality of inner convex portions (111, 112, 113) of the inner muffler (110).

[0191] Accordingly, the outer muffler (120) may include at least one non-bonded outer convex portion (124) that is not bonded with the plurality of inner convex portions (111, 112, 113) of the inner muffler (110). That is, at least one of the plurality of inner convex portions (121, 122, 123, 124) of the outer muffler (120) may form a non-bonded outer convex portion (124) that is not bonded with the plurality of inner convex portions (111, 112, 113) of the inner muffler (110).

[0192] The non-bonded outer convex portion (124) can form an outer muffler space (S). A refrigerant can be accommodated in the outer muffler space (S).

[0193] The refrigerant discharge passage (119) of the inner muffler (110) can be formed in the inner dome portion (116) of the inner muffler (110) facing the non-coupling outer convex portion (124) of the outer muffler (120). Therefore, the refrigerant discharged through the refrigerant discharge passage (119) of the inner muffler (110) can be accommodated in the interior of the non-coupling outer convex portion (124), i.e., in the outer muffler space (S).

[0194] The non-coupling outer convex portion (124) may be formed to communicate with the sub-coolant hole (1101) of the inner muffler (110). In other words, the non-coupling outer convex portion (124) may be formed to cover the sub-coolant hole (1101) of the inner muffler (110).

[0195] Since the sub-refrigerant hole (1101) of the inner muffler (110) communicates with the refrigerant passage (PF3) of the compression section (40) that is not in communication with the inner muffler space, the non-coupling outer convex portion (124) can communicate with the refrigerant passage (PF3) that is not in communication with the inner muffler space. That is, the non-coupling outer convex portion (124) can be formed to communicate with the refrigerant passage (PF3) that is not in communication with the inner muffler space.

[0196] In the present embodiment, the inner muffler (110) includes three inner convex portions (111, 112, 113), and the outer muffler (120) includes four outer convex portions (121, 122, 123, 124). That is, the inner muffler (110) includes first, second, and third inner convex portions (111, 112, 113), and the outer muffler (120) includes first, second, third, and fourth outer convex portions (121, 122, 123, 124).

[0197] As illustrated in FIGS. 12 and 13, when the inner muffler (110) is coupled to the outer muffler (120), the inner fixing plate (115) of the inner muffler (110) and the outer fixing plate (125) of the outer muffler (120) come into contact, and the first, second, and third inner convex portions (111, 112, 113) of the inner muffler (110) are coupled to the first, second, and third outer convex portions (121, 122, 123) of the outer muffler (120). At this time, the fourth outer convex portion (124) of the outer muffler (120) that is not coupled to the inner convex portions (111, 112, 113) of the inner muffler (110), i.e., the uncoupled outer convex portion, forms an outer muffler space (S).

[0198] The external muffler space (S) can be determined by the volume of the internal muffler space and the rated volume of the rotary compressor (1). That is, the sum of the volume of the external muffler space (S) and the volume of the internal muffler space becomes the rated volume. The rated volume refers to the volume that can accommodate the amount of refrigerant corresponding to the rated load of the rotary compressor (1).

[0199] The fourth outer convex portion (124) of the outer muffler (120) covers the sub-refrigerant hole (1101) of the inner muffler (110). In addition, the refrigerant discharge passage (119) of the inner muffler (110) faces the fourth outer convex portion (124). Therefore, the refrigerant discharge passage (119) and the sub-refrigerant hole (1101) of the inner muffler (110) are connected to the outer muffler space (S) of the outer muffler (120).

[0200] That is, the external muffler (120) can be formed so that the external muffler space (S) communicates with the refrigerant passage far from the discharge hole (924) that is not communicated with the internal muffler space among the three refrigerant passages (PF1, PF2, PF3), i.e., the third refrigerant passage (PF3).

[0201] Additionally, when the inner muffler (110) and the outer muffler (120) are combined, the plurality of second bolt holes (118) of the inner muffler (110) and the plurality of third bolt holes (128) of the outer muffler (120) are aligned.

[0202] The refrigerant discharge passage (119) may be formed as a plurality of holes (1191), i.e., perforations, in a portion (IA) of the inner dome portion (116) of the inner muffler (110) that contacts the fourth outer convex portion (124) of the outer muffler (120). The plurality of holes (1191) may be formed with a perforation ratio of 20% to 80%. At this time, the perforation ratio may be determined based on the area of ​​the portion (IA) of the inner dome portion (116) that faces and contacts the fourth outer convex portion (124) of the outer muffler (120).

[0203] The outer muffler (120) may include at least one non-coupling outer convex portion (124). In the present embodiment, since the inner muffler (110) includes one sub-coolant hole (1101), the outer muffler (120) also includes one non-coupling outer convex portion (124). However, the present disclosure is not limited thereto. The outer muffler (120) according to one or more embodiments of the present disclosure may include two or more non-coupling outer convex portions (124).

[0204] A through hole (127) may be provided at the bottom of the outer dome (126). An oil pump installed at the bottom of the drive shaft (30) may be immersed in oil contained in the oil tank (16) through the through hole (127) of the outer dome (126).

[0205] A caulking portion (129) may be provided at the bottom of the outer dome portion (126). The caulking portion (129) may be provided at the edge of the through hole (127). The caulking portion (129) is formed so as to be fixed to one end of the boss (926) of the lower flange (92). When the caulking portion (129) of the outer dome portion (126) is coupled to one end of the boss (926) of the lower flange (92), it is possible to prevent refrigerant from leaking between one end of the boss (926) of the lower flange (92) and the through hole (127) of the outer dome portion (126).

[0206] The caulking portion (129) can be formed by performing caulking work along the entire circumference of the through hole (127) of the outer dome portion (126).

[0207] An external dome portion (126) can be provided between the external fixing plate (125) and the caulking portion (129).

[0208] The upper end of the outer muffler (120) may be formed so as not to protrude above the lower surface of the lower flange (92). Specifically, the outer fixing plate (125) of the outer muffler (120) may not protrude above the lower surface of the flange portion (925) of the lower flange (92), but may be positioned below it. That is, the upper surface of the outer fixing plate (125) of the outer muffler (120) may be in contact with the lower surface of the inner fixing plate (115) of the inner muffler (110).

[0209] The upper surface of the outer fixing plate (125) of the outer muffler (120) may be formed so as not to come into contact with the side surface of the flange portion (925) of the lower flange (92). If the outer fixing plate (125) of the outer muffler (120) does not come into contact with the side surface of the flange portion (925) of the lower flange (92), pressure by the outer muffler (120) may not be applied to the bearing (927) installed in the lower flange (92). In other words, the outer muffler (120) may be formed as a flat muffler.

[0210] The outer muffler (120), the inner muffler (110), and the lower flange (92) can be fixed to the upper cylinder (50) by a plurality of bolts (93). Specifically, the plurality of bolts (93) can be fastened to the plurality of tapped holes (502) of the upper cylinder (50) through a plurality of third bolt holes (128) of the outer muffler (120), a plurality of second bolt holes (118) of the inner muffler (110), a plurality of first bolt holes (922) of the lower flange (92), a plurality of bolt holes (602) of the lower cylinder (60), and a plurality of bolt holes (702) of the middle plate (70). Then, the outer muffler (120), the inner muffler (110), the lower flange (92), the lower cylinder (60), and the middle plate (70) can be fixed to the upper cylinder (50) as a single unit.

[0211] The refrigerant discharged downward through the discharge hole (924) of the lower flange (92) passes through the internal space of the lower muffler (100) and, after noise is reduced, can flow into the plurality of refrigerant holes (923) of the lower flange (92).

[0212] The refrigerant introduced into the plurality of refrigerant holes (923) of the lower flange (92) can be discharged to the upper side of the upper flange (91) through the plurality of refrigerant holes (603) of the lower cylinder (60), the plurality of refrigerant holes (703) of the middle plate (70), the plurality of refrigerant holes (503) of the upper cylinder (50), and the plurality of refrigerant holes (913) of the upper flange (91), i.e., the plurality of refrigerant passages (PF1, PF2, PF3).

[0213] In the above, the case where the refrigerant discharge passage (119) of the internal muffler (110) is formed as a perforation has been described, but the structure of the refrigerant discharge passage (119) is not limited to this. The refrigerant discharge passage (119) may be formed as a valve.

[0214] Fig. 14 is a perspective view showing an internal muffler (110) of a rotary compressor (1) according to one or more embodiments of the present disclosure. Fig. 15 is a perspective view showing a state in which an internal muffler (110) and an external muffler (120) of a rotary compressor (1) according to one or more embodiments of the present disclosure are combined.

[0215] Referring to FIG. 14, an internal muffler (110) according to one or more embodiments of the present disclosure may include an internal fixing plate (115) and an internal dome portion (116).

[0216] The internal fixing plate (115) and internal dome portion (116) of the internal muffler (110) illustrated in Fig. 14 are identical in all structures except for the refrigerant discharge passage (119) to the internal muffler (110) illustrated in Figs. 8 and 9, so a detailed description thereof will be omitted.

[0217] Referring to Fig. 14, the inner muffler (110) may include a refrigerant discharge passage (119). The refrigerant discharge passage (119) may be formed by a plate valve. The plate valve may be installed in a portion of the inner dome portion (116) where a plurality of convex portions (111, 112, 113) are not formed. The refrigerant contained in the inner muffler space of the inner muffler (110) may selectively pass through the plate valve depending on the pressure and move to the outer muffler space (S) of the outer muffler (120).

[0218] The plate valve may include a base (1192) and a leaf (1193). An opening (1194) corresponding to the leaf (1193) is formed in the base (1192). The opening (1194) communicates with the internal space of the internal muffler (110). One end of the leaf (1193) is fixed to the base (1192). The leaf (1193) is formed of an elastic material. Therefore, the leaf (1193) can open and close the opening (1194) of the base (1192) depending on the internal pressure of the internal muffler (110).

[0219] When the amount of refrigerant contained in the internal muffler space of the internal muffler (110) increases and the stagnation pressure of the refrigerant rises above a certain level, one end of the leaf (1193) rises and the opening (1194) of the base (1192) opens. Then, the refrigerant of the internal muffler (110) can move to the external muffler space (S) of the external muffler (120) through the plate valve.

[0220] When the stagnant pressure in the internal muffler space of the internal muffler (110) decreases, the leaf (1193) descends and blocks the opening (1194) of the base (1192). Therefore, the refrigerant in the internal muffler space cannot move to the external muffler space (S) through the refrigerant discharge passage (119), i.e., the plate valve.

[0221] The inner muffler (110) can be coupled to the outer muffler (120). The outer muffler (120) is identical to the outer muffler (120) illustrated in FIGS. 10 and 11, so a detailed description thereof will be omitted.

[0222] As illustrated in Fig. 15, when the inner muffler (110) is coupled to the outer muffler (120), the inner fixing plate (115) of the inner muffler (110) and the outer fixing plate (125) of the outer muffler (120) come into contact, and the first, second, and third inner convex portions (111, 112, 113) of the inner muffler (110) are coupled to the first, second, and third outer convex portions (121, 122, 123) of the outer muffler (120). At this time, the fourth outer convex portion (124) of the outer muffler (120) that is not coupled to the inner convex portions (111, 112, 113) of the inner muffler (110), i.e., the uncoupled outer convex portion, forms an outer muffler space (S).

[0223] The fourth outer convex portion (124) of the outer muffler (120) covers the sub-refrigerant hole (1101) of the inner muffler (110). In addition, the refrigerant discharge passage (119) of the inner muffler (110) faces the fourth outer convex portion (124). Therefore, the refrigerant discharge passage (119) and the sub-refrigerant hole (1101) of the inner muffler (110) are connected to the outer muffler space (S) of the outer muffler (120).

[0224] When the amount of refrigerant contained in the internal muffler space of the internal muffler (110) increases and the stagnation pressure of the refrigerant rises above a certain level, one end of the leaf (1193) rises and the opening (1194) of the base (1192) opens. Then, the refrigerant of the internal muffler (110) moves to the external muffler space (S) of the external muffler (120) through the plate valve and can flow into the refrigerant passage (PF3) of the compression unit (40) through the sub refrigerant hole (1101).

[0225] Hereinafter, the operation of a rotary compressor (1) according to one or more embodiments of the present disclosure will be described in detail with reference to FIGS. 16 and 17.

[0226] A rotary compressor (1) according to one or more embodiments of the present disclosure can operate under various load conditions. For example, the rotary compressor (1) can operate under low load, medium load, and high load conditions. The high load condition may be the rated load of the rotary compressor (1). The load condition may vary depending on the operating conditions of the rotary compressor (1).

[0227] When the rotary compressor (1) operates at a constant load, the refrigerant is discharged from the discharge hole (924) of the lower surface of the compression section (40), i.e., the lower flange (92).

[0228] When the load applied to the rotary compressor (1) increases, the flow rate of the refrigerant discharged from the compression section (40) increases. That is, the flow rate of the refrigerant discharged from the compression section (40) when the rotary compressor (1) operates at a low load is less than the flow rate of the refrigerant discharged from the compression section (40) when the rotary compressor (1) operates at a medium load and a high load. The flow rate of the refrigerant discharged from the compression section when the rotary compressor (1) operates at a medium load is greater than the flow rate of the refrigerant discharged from the compression section (40) when the rotary compressor (1) operates at a low load, and is less than the flow rate of the refrigerant discharged from the compression section (40) when the rotary compressor (1) operates at a high load. When the rotary compressor (1) operates at high load, the flow rate of refrigerant discharged from the compression section (40) is greater than the flow rate of refrigerant discharged from the compression section (40) when the rotary compressor (1) operates at low and medium loads.

[0229] FIG. 16 is a drawing showing the flow of refrigerant when a rotary compressor (1) according to one or more embodiments of the present disclosure operates at low load.

[0230] As illustrated in Fig. 16, when the rotary compressor (1) operates at low load, a small amount of refrigerant (F) is discharged from the discharge port (924). The refrigerant discharged from the discharge port (924) moves along the space of the internal muffler (110), i.e., the internal muffler space.

[0231] In the present embodiment, since the discharge hole (924) is located at the lower side of the first internal convex portion (111) of the internal muffler (110) based on FIG. 16, the refrigerant coming out of the discharge hole (924) moves to the upper side of the first internal convex portion (111). The refrigerant moving to the upper side of the first internal convex portion (111) flows into the second internal convex portion (112). Since the internal space of the second internal convex portion (112) is connected to the first refrigerant passage (PF1), a portion of the refrigerant, i.e., the first amount of refrigerant flows into the first refrigerant passage (PF1), moves along the first refrigerant passage (PF1), and flows into the upper side of the upper flange (91), i.e., the internal space of the upper muffler (80).

[0232] The remaining refrigerant continues to move and flows into the third inner convex portion (113). Since the inner space of the third inner convex portion (113) is connected to the second refrigerant passage (PF2), most of the remaining refrigerant, i.e., the second amount of refrigerant, flows into the second refrigerant passage (PF2), moves along the second refrigerant passage (PF2), and flows into the inner space of the upper muffler (80). A very small amount of the remaining refrigerant, i.e., the third amount of refrigerant, can continue to move along the inner dome portion (116) of the inner muffler (110). However, since the third amount of refrigerant moving along the inner dome portion (116) is very small, the stagnation pressure is very low and the refrigerant cannot pass through the refrigerant discharge passage (119).

[0233] FIG. 17 is a drawing showing the flow of refrigerant when a rotary compressor (1) according to one or more embodiments of the present disclosure operates at high load.

[0234] As illustrated in Fig. 17, when the rotary compressor (1) operates at a high load, a large amount of refrigerant, i.e., refrigerant of the rated capacity, is discharged from the discharge port (924). The refrigerant discharged from the discharge port (924) moves along the space of the internal muffler (110), i.e., the internal muffler space.

[0235] In the present embodiment, since the discharge hole (924) is located at the lower side of the first internal convex portion (111) of the internal muffler (110) based on FIG. 17, the refrigerant (F) coming out of the discharge hole (924) moves to the upper side of the first internal convex portion (111). The refrigerant that has moved to the upper side of the first internal convex portion (111) flows into the second internal convex portion (112). Since the internal space of the second internal convex portion (112) is connected to the first refrigerant passage (PF1), a portion of the refrigerant, i.e., the first amount of refrigerant flows into the first refrigerant passage (PF1), moves along the first refrigerant passage (PF1), and flows into the upper side of the upper flange (91), i.e., the internal space of the upper muffler (80).

[0236] The remaining refrigerant continues to move and flows into the third internal convex portion (113). Since the internal space of the third internal convex portion (113) is connected to the second refrigerant passage (PF2), a portion of the remaining refrigerant, i.e., the second amount of refrigerant, flows into the second refrigerant passage (PF2), moves along the second refrigerant passage (PF2), and flows into the internal space of the upper muffler (80).

[0237] The remaining refrigerant, i.e., the third amount of refrigerant, can continue to move along the inner dome portion (116) of the inner muffler (110). Since the third amount of refrigerant moving along the inner dome portion (116) is large in quantity, the stagnation pressure is high, and the refrigerant can pass through the refrigerant discharge passage (119). Therefore, the third amount of refrigerant passes through the refrigerant discharge passage (119) and flows into the inner space of the fourth outer convex portion (124) of the outer muffler (120), i.e., the non-coupling outer convex portion, i.e., the outer muffler space (S). Since the outer muffler space (S) is connected to the third refrigerant passage (PF3) through the sub-refrigerant hole (1101) of the inner muffler (110), the third amount of refrigerant moves along the third refrigerant passage (PF3) and flows into the inner space of the upper muffler (80).

[0238] Even when the rotary compressor (1) operates at a medium load, some of the refrigerant may pass through the refrigerant discharge passage (119) of the internal muffler (110) and move to the upper muffler (80) through the third refrigerant passage (PF3). In this case, the amount of refrigerant that moves to the upper muffler (80) through the third refrigerant passage (PF3) is less than when the rotary compressor (1) operates at a high load.

[0239] The refrigerant discharged into the internal space of the upper muffler (80) can be discharged into the upper side of the upper muffler (80), i.e., the space between the motor (20) and the compression unit (40), through the plurality of openings (81) of the upper muffler (80).

[0240] The refrigerant that has moved into the space between the motor (20) and the compression unit (40) can move to the upper part of the motor (20) through the motor (20). For example, the refrigerant in the space between the motor (20) and the compression unit (40) can move to the upper part of the motor (20) through the gap between the rotor (22) and the stator (21) and the plurality of refrigerant holes (27) provided in the rotor (22).

[0241] The refrigerant that has moved to the upper part of the motor (20) can be discharged to the outside of the casing (10) through the refrigerant discharge pipe (14) installed in the upper casing (11).

[0242] Hereinafter, with reference to FIG. 18, when a rotary compressor (1) according to one or more embodiments of the present disclosure operates, the flow rates of refrigerant passing through a plurality of refrigerant passages according to the load applied to the rotary compressor (1) are compared and explained.

[0243] FIG. 18 is a graph showing the flow rate of refrigerant passing through a plurality of refrigerant passages according to the operating conditions of a rotary compressor (1) according to one or more embodiments of the present disclosure.

[0244] For reference, in Fig. 18, the vertical axis represents the flow rate of refrigerant passing through multiple refrigerant passages (PF1, PF2, PF3). The horizontal axis represents multiple refrigerant passages when the rotary compressor (1) operates at low load, medium load, and rated load. The load is based on the CSPF (Cooling Seasonal Performance Factor). Accordingly, CSPF_low load refers to low temperature in CSPF, CSPF_medium refers to medium temperature in CSPF, and CSPF_rated refers to high temperature in CSPF.

[0245] Referring to Fig. 18, when the rotary compressor (1) operates at low load (CSPF_low load), the refrigerant can move to the upper side of the compression unit (40) through the first refrigerant passage (PF1) and the second refrigerant passage (PF2). Since the amount of refrigerant discharged from the discharge hole (924) is small, no refrigerant is discharged to the external muffler space (S) of the external muffler (120) through the refrigerant discharge passage (119) of the internal muffler (110). At this time, the flow rate of the refrigerant passing through the first refrigerant passage (PF1) and the flow rate of the refrigerant passing through the second refrigerant passage (PF2) may be approximately the same.

[0246] When the rotary compressor (1) operates at a medium load (CSPF_medium), the refrigerant can move to the upper side of the compression unit (40) through the first refrigerant passage (PF1), the second refrigerant passage (PF2), and the third refrigerant passage (PF3). That is, the refrigerant discharged from the discharge hole (924) can flow into the first refrigerant passage (PF1) and the second refrigerant passage (PF2) through the internal muffler space of the internal muffler (110). In addition, since the amount of refrigerant discharged from the discharge hole (924) is large, some of the refrigerant can be discharged into the external muffler space (S) of the external muffler (120) through the refrigerant discharge passage (119) of the internal muffler (110). The refrigerant introduced into the external muffler space (S) can flow into the third refrigerant passage (PF3). At this time, the flow rate of the refrigerant passing through the first refrigerant passage (PF1) may be less than the flow rate of the refrigerant passing through the second refrigerant passage (PF2) and less than the flow rate of the refrigerant passing through the third refrigerant passage (PF3). In other words, the flow rate of the refrigerant passing through the second refrigerant passage (PF2) may be the largest, and the flow rate of the refrigerant passing through the third refrigerant passage (PF3) may be the smallest.

[0247] When the rotary compressor (1) operates at a high load (CSPF_rated), the refrigerant can move to the upper side of the compression unit (40) through the first refrigerant passage (PF1), the second refrigerant passage (PF2), and the third refrigerant passage (PF3). That is, the refrigerant discharged from the discharge hole (924) can flow into the first refrigerant passage (PF1) and the second refrigerant passage (PF2) through the internal muffler space of the internal muffler (110). In addition, since the amount of refrigerant discharged from the discharge hole (924) is very large, some of the refrigerant can be discharged into the external muffler space (S) of the external muffler (120) through the refrigerant discharge passage (119) of the internal muffler (110). The refrigerant introduced into the external muffler space (S) can flow into the third refrigerant passage (PF3). At this time, the flow rate of the refrigerant passing through the first refrigerant passage (PF1) may be less than the flow rate of the refrigerant passing through the second refrigerant passage (PF2) and less than the flow rate of the refrigerant passing through the third refrigerant passage (PF3). In other words, the flow rate of the refrigerant passing through the second refrigerant passage (PF2) may be the largest, and the flow rate of the refrigerant passing through the third refrigerant passage (PF3) may be the smallest.

[0248] As described above, the rotary compressor (1) according to one or more embodiments of the present disclosure can change the volume of the internal space of the lower muffler (100) according to the refrigerant flow rate that changes depending on the operating conditions, and thus can respond to a wide range of operating conditions.

[0249] In the case of a rotary compressor (1) in which the volume of the internal space of the lower muffler (100) is determined to correspond to the rated load, when the rotary compressor (1) operates at low load, the volume of the internal space of the lower muffler (100) is too large compared to the amount of circulating refrigerant, so the efficiency of the rotary compressor (1) decreases.

[0250] However, in the rotary compressor (1) according to one or more embodiments of the present disclosure, when the rotary compressor (1) operates at a low load, the refrigerant circulates only through the internal space of the internal muffler (110), and when the rotary compressor (1) operates at a high load, the refrigerant can circulate through the internal space of the internal muffler (110) and the internal space of the external muffler (120). Therefore, even when the rotary compressor (1) operates at a low load, the efficiency of the rotary compressor (1) may not decrease.

[0251] In addition, since the rotary compressor (1) according to one or more embodiments of the present disclosure has a refrigerant discharge passage (119) that connects the inner muffler (110) and the outer muffler (120) formed to be selectively operated depending on the flow rate of the refrigerant, a separate electrical device for operating the refrigerant discharge passage (119) is not required. Accordingly, the material cost of the rotary compressor (1) can be minimized.

[0252] In addition, since the rotary compressor (1) according to one or more embodiments of the present disclosure has a double structure of a lower muffler (100) including an inner muffler (110) and an outer muffler (120), when the rotary compressor (1) operates at a high load, the lower muffler (100) is deformed, thereby preventing or minimizing refrigerant leakage between the lower muffler (100) and the lower flange (92).

[0253] While the present disclosure has been illustrated and described above with reference to various embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. Casing; A motor installed inside the above casing; A compression unit installed below the above motor; A plurality of refrigerant passages formed along the edge of the compression section and penetrating the compression section vertically; An upper muffler installed on the upper surface of the compression section and forming an upper muffler space communicating with the plurality of refrigerant passages; An internal muffler installed on the lower surface of the compression section and forming an internal muffler space that is not connected to at least one of the plurality of refrigerant passages and is connected to the remaining refrigerant passages; An external muffler installed below the internal muffler and forming an external muffler space that is connected to at least one refrigerant passage that is not connected to the internal muffler space; and A rotary compressor, comprising: a refrigerant discharge passage provided in a portion of the inner muffler in contact with the outer muffler space, the refrigerant in the inner muffler space being selectively discharged to the outer muffler space according to the flow rate of the refrigerant discharged from the lower surface of the compression section.

2. In paragraph 1, A rotary compressor, wherein the above refrigerant discharge passage is formed by a plurality of holes.

3. In paragraph 2, A rotary compressor, wherein the plurality of holes are formed at a perforation rate of 20% to 80%.

4. In paragraph 1, A rotary compressor, wherein the above refrigerant discharge passage is formed by a plate valve.

5. In paragraph 1, A discharge hole is provided on the lower surface of the above compression section through which the compressed refrigerant is discharged. A rotary compressor, wherein the above exhaust port is located in the internal muffler space.

6. In paragraph 5, The above plurality of refrigerant passages include three refrigerant passages, The above inner muffler is a rotary compressor, wherein the inner muffler space is formed so as to communicate with two refrigerant passages adjacent to the discharge port in the direction of the flow of refrigerant discharged from the discharge port among the three refrigerant passages, and not communicate with a refrigerant passage far from the discharge port in the direction of the flow of the refrigerant.

7. In paragraph 6, A rotary compressor, wherein the external muffler is formed so that the external muffler space communicates with a refrigerant passage that is far from the discharge hole and is not communicated with the internal muffler space among the three refrigerant passages.

8. In paragraph 1, The inner muffler is formed in a dome shape and includes a plurality of inner convex portions formed at regular intervals along the circumference of the inner muffler on the side of the inner muffler. A rotary compressor, wherein the plurality of refrigerant passages communicating with the internal muffler space are located in the plurality of internal convex portions.

9. In paragraph 8, The above outer muffler is formed in a dome shape corresponding to the above inner muffler and includes a plurality of outer convex portions formed at regular intervals along the circumferential direction of the outer muffler on the side surface of the above outer muffler. A rotary compressor, wherein the number of the plurality of outer convex portions is formed to be at least one more than the number of the plurality of inner convex portions.

10. In paragraph 9, When the above outer muffler and the above inner muffler are combined, the plurality of inner convex portions of the inner muffler are all combined with the plurality of outer convex portions of the outer muffler, A rotary compressor, wherein the non-joined outer convex portions of the outer muffler, which are not joined to the plurality of inner convex portions of the inner muffler, form the outer muffler space.

11. In Article 10, A rotary compressor, wherein the refrigerant discharge passage is formed on a side of the inner muffler facing the non-coupling outer convex portion of the outer muffler.

12. In paragraph 10, A rotary compressor, wherein said at least one refrigerant passage not communicating with said inner muffler space is located on an uncoupled outer convex portion of said outer muffler that is not coupled with a plurality of inner convex portions of said inner muffler.

13. In paragraph 12, A rotary compressor, wherein the inner muffler further includes a sub-refrigerant hole formed at a position corresponding to the non-coupling outer convex portion of the outer muffler.

14. In paragraph 10, The above inner muffler comprises first, second, and third inner convex portions, The above outer muffler includes first, second, third, and fourth outer convex portions, A rotary compressor, wherein when the inner muffler and the outer muffler are combined, the first, second, and third inner convex portions are combined with the first, second, and third outer convex portions, and the fourth outer convex portion forms the outer muffler space.

15. In paragraph 1, A rotary compressor, wherein the sum of the volume of the inner muffler space and the volume of the outer muffler space is the rated volume.

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