Compressor

Abstract

A compressor is disclosed. The compressor comprises: a housing; a driving motor including a rotor and a stator; a shaft having an eccentric part so as to transmit, to a compression part, the power generated by the driving motor; a rolling piston coming in contact with the outer peripheral surface of the eccentric part and including a roller, which has an empty space therein, and a vane integrated with the roller; a cylinder for forming a compression chamber together with the rolling piston; and a bush provided in the cylinder, wherein the rolling piston is vertically divided into two parts and includes a first member provided at a lower part and a second member provided at an upper part, a first groove is formed along the circumference of the roller on the upper surface of the first member and a second groove is formed along the circumference of the roller on the lower surface of the second member, and the upper surface of the first member in which the first groove is formed and the lower surface of the second member in which the second groove is formed come in contact with each other.

Description

compressor

[0001] The present invention relates to a compressor used in air conditioners, etc.

[0002] A compressor is a mechanical device that receives power from a power generation device, such as an electric motor or turbine, and compresses air, refrigerants, or various other working gases to increase their pressure. Compressors are widely used in home appliances, such as refrigerators, air conditioners, and clothes dryers, as well as across various industries.

[0003] Types of compressors include reciprocating compressors, scroll compressors, and rotary compressors. In a reciprocating compressor, a compression space is formed between the piston and the cylinder for the intake and discharge of working gas, and the piston compresses the working gas by performing a linear reciprocating motion inside the cylinder. In a scroll compressor, a compression space is formed between the rotary scroll and the stationary scroll for the intake and discharge of working gas, and the rotary scroll compresses the working gas as it rotates along the stationary scroll. In a rotary compressor, a compression space is formed between the cylinder and the eccentrically rotating rolling piston for the intake and discharge of working gas, and the rolling piston compresses the working gas as it rotates eccentrically along the inner wall of the cylinder.

[0004] One aspect of the present invention provides a rolling piston in which a vane and a roller are integrally formed.

[0005] One aspect of the present invention provides a compressor in which an internal space is provided in the roller of a rolling piston.

[0006] One aspect of the present invention provides a vane compressor in which no internal space is formed.

[0007] The technical problems to be solved in this document are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which this invention belongs from the description below.

[0008] A compressor according to the concept of the present invention comprises a housing, a drive motor including a rotor and a stator, a shaft having an eccentric portion for transmitting power generated by the drive motor to a compression portion, a rolling piston including a roller having an internal space on the inside and contacting the outer surface of the eccentric portion and a vane formed integrally with the roller, a cylinder forming a compression chamber together with the rolling piston, and a bushing provided in the cylinder. The rolling piston is divided into upper and lower parts and includes a first member provided in the lower part and a second member provided in the upper part. A first groove is formed along the circumference of the roller on the upper surface of the first member and a second groove is formed along the circumference of the roller on the lower surface of the second member. The upper surface of the first member where the first groove is formed and the lower surface of the second member where the second groove is formed are arranged to be in contact with each other.

[0009] A compressor according to the concept of the present invention comprises a housing, a shaft including an eccentric portion having a passage for supplying oil, a rolling piston including a roller having an internal space on the inside and arranged to be divided vertically and a vane integrally coupled to the roller, a cylinder forming a compression chamber together with the rolling piston, and a bushing provided in the cylinder and arranged to receive the vane, wherein oil flowing into the side of the eccentric portion through the passage is blocked from flowing into the compression chamber.

[0010] FIG. 1 is an axial cross-sectional view of a compressor according to one embodiment of the present invention.

[0011] FIG. 2 is an enlarged view of the area corresponding to part A of FIG. 1 of a compressor according to one embodiment of the present invention.

[0012] FIG. 3 is a cross-sectional view in the direction corresponding to the BB' direction of FIG. 2 in the compression section of a compressor according to one embodiment of the present invention.

[0013] FIG. 4 is a cross-sectional view in the direction corresponding to the BB' direction of FIG. 2 in the compression section of a compressor according to one embodiment of the present invention.

[0014] FIG. 5 is a perspective view of a rolling piston shape according to one embodiment of the present invention.

[0015] FIG. 6 is a cross-sectional perspective view of the C-C' direction section of FIG. 5.

[0016] FIG. 7 is a cross-sectional view taken in the CC' direction of FIG. 5 of a rolling piston according to one embodiment of the present invention.

[0017] FIG. 8 is a cross-sectional view taken in the CC' direction of FIG. 5 of a rolling piston according to one embodiment of the present invention.

[0018] The embodiments described in this specification and the configurations illustrated in the drawings are merely preferred examples of the disclosed invention, and various modifications that may replace the embodiments and drawings of this specification may exist at the time of filing this application.

[0019] Additionally, the same reference numerals or symbols presented in each drawing of this specification represent parts or components that perform substantially the same function.

[0020] Additionally, the singular form of the noun corresponding to the item may include one or multiple items, unless the relevant context clearly indicates otherwise.

[0021] Additionally, in this document, each of the phrases such as "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 the corresponding phrase, or all possible combinations thereof.

[0022] Additionally, the terms "part," "module," and "component" may be implemented in hardware or software. Depending on the embodiments, a plurality of "parts," "modules," and "components" may be implemented as a single component, or a single "part," "module," or "component" may include a plurality of components.

[0023] Furthermore, the terms used in this specification are for describing embodiments and are not intended to limit or / or restrict the disclosed invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprising" or "having" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and do not preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0024] Additionally, terms including ordinal numbers, such as "first," "second," etc., used herein may be used to describe various components, but said components are not limited by said terms, and said terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and / or" includes a combination of a plurality of related described items or any one of a plurality of related described items.

[0025] Where any (e.g., 1st) component is referred to as "coupled" or "connected" to another (e.g., 2nd) component, with or without the terms "functionally" or "communicationly," it means that said any component may be connected to said other component directly (e.g., via a wire), wirelessly, or through a third component.

[0026] When it is said that a component is "connected," "combined," "supported," or "in contact" with another component, this includes not only cases where the components are directly connected, combined, supported, or in contact, but also cases where they are indirectly connected, combined, supported, or in contact through a third component.

[0027] When it is said that a component is located "on" another component, this includes not only cases where one component is in contact with the other, but also cases where another component exists between the two components.

[0028] Meanwhile, terms such as "up / down direction" and "front / back direction" used in the following description are defined based on the drawings, and the shape and position of each component are not limited by these terms. For example, the terms "front" and "rear" below may refer to the +X direction and -X direction, respectively, as depicted in the drawings. The terms "up" and "down" below may refer to the +Z direction and -Z direction, respectively, as depicted in the drawings. The terms "left direction" and "right direction" below may refer to the +Y direction and -Y direction, respectively, as depicted in the drawings. The term "vertical direction" below may refer to the Z direction, respectively, as depicted in the drawings, and the term "horizontal direction" below may refer to the Y direction, respectively, as depicted in the drawings. However, in some drawings, the +X direction may be referred to as "up" and the -X direction may be referred to as "down."

[0029] Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings.

[0030] FIG. 1 is an axial cross-sectional view of a compressor according to one embodiment of the present invention.

[0031] Referring to FIG. 1, a compressor (1) according to one embodiment of the present disclosure may include a compression unit (20) configured to compress a refrigerant, a driving motor (30) provided to provide power to the compression unit (20), and a housing (10) that accommodates the compression unit (20) and the driving motor (30).

[0032] The housing (10) can form the exterior of the compressor (1). Inside the housing (10), a receiving space can be formed to accommodate the compression unit (20) and the drive motor (30). Oil can be stored in the lower inner part of the housing (10) to reduce friction between the various components of the compressor (1) and to cool the components.

[0033] The housing (10) may include a cylindrical main body (11) with an open top and bottom surface, and an upper cap (12) and a lower cap (13) mounted respectively on the upper and lower parts of the main body (11) to seal the interior of the main body (11). The connection between the main body (11), the upper cap (12), and the lower cap (13) may be sealed so that the interior of the housing (10) is sealed.

[0034] A base (16) supporting the housing (10) may be provided at the bottom of the housing (10). The base (16) may be coupled to the lower cap (13). The compressor (1) may be installed vertically with respect to the bottom surface or support surface by means of the base (16).

[0035] The housing (10) can be connected to the accumulator (2) by the compressor inlet pipe (4). The refrigerant in the accumulator (2) can be introduced into the operating chamber (25) in the cylinder (21) through the cylinder inlet pipe (4).

[0036] A compressor discharge pipe (5) may be connected to the discharge portion (3) of the housing (10). The compressor discharge pipe (5) may be provided to guide the refrigerant compressed inside the housing (10) to be discharged outside the housing (10).

[0037] The drive motor (30) can convert electromagnetic force into mechanical rotational force. The drive motor (30) may include a stator (31) fixed to the housing (10) and a rotor (32) having magnetism and capable of rotating relative to the stator (31) by electromagnetic force.

[0038] The compressor (1) may include a shaft (40) configured to transmit power generated by a drive motor (30) to a compression unit (20). The shaft (40) may be fixed to a rotor (32) and configured to rotate together with the rotor (32).

[0039] The compression section (20) may be positioned below the drive motor (30). The compression section (20) may include a main bearing (33) forming the upper part, a sub-bearing (34) forming the lower part, a cylinder (21) forming the side, and a mid plate (23). Additionally, the compression section (20) may further include an upper cover covering the upper surface of the main bearing (33) and a lower cover covering the lower surface of the sub-bearing (34) at the upper and lower parts.

[0040] The members forming the compression section (20) can be joined together through fastening members. The compression section (20) can form a sealed inner space by joining each member. The sealed inner space may include an operating chamber (25), and the operating chamber (25) may include a suction chamber (24) and a compression chamber (22).

[0041] More specifically, the cylinder (21) of the compression unit (20) may include a second cylinder positioned at the upper part of the compression unit (20) and a first cylinder positioned at the lower part. The second cylinder and the first cylinder may be spaced apart from each other along the direction of the rotation axis (47). A mid plate (23) that partitions the space between the second cylinder and the first cylinder may be provided between the second cylinder and the first cylinder.

[0042] In the operating chamber (25) formed on the upper part of the compression section (20), the upper and lower surfaces of the operating chamber (25) can be formed by the main bearing (33) and the mid plate (23), respectively, and the side surface of the operating chamber (25) can be formed by the cylinder (21).

[0043] Additionally, in the operating chamber (25) formed at the lower part of the compression section (20), the lower and upper surfaces of the operating chamber (25) can be formed by the sub-bearing (34) and the mid plate (23), respectively, and the side surface of the operating chamber (25) can be formed by the cylinder (21). Accordingly, the operating chamber (25) can be formed inside the cylinder (21).

[0044] The operating chamber (25) may be provided with an eccentric portion (42) of the shaft (40) and a rolling piston (100). The operating chamber (25) may include an intake port (7) on one side that communicates with the outside of the compression portion (20) to draw in refrigerant. The intake port (7) may be connected to a suction pipe (6) connected to an inlet pipe (4) to draw in refrigerant.

[0045] In the compressor (1), the rotor (32) and shaft (40) are rotated by a magnetic field formed by applying current to the stator (31), and the eccentric part (42), which rotates integrally with the shaft (40) inside the cylinder (21), can be rotated eccentrically. At this time, a rolling piston (100) in contact with the outer surface of the eccentric part (42) can be arranged to move together with the eccentric part (42).

[0046] As the eccentric part (42) rotates eccentrically about the axis of rotation (47) of the shaft (40), the roller (130) of the rolling piston (100) can rotate about the axis of rotation (47) of the shaft (40) and rotate about the eccentric part (42) of the shaft (40).

[0047] The rolling piston (100) may be configured to rotate by receiving power from the shaft (40). The rolling piston (100) may be configured to compress the refrigerant in the compression chamber (22) as it rotates inside the cylinder (21).

[0048] The rolling piston (100) may include a roller (130) (see FIG. 5) and a vane (140) (see FIG. 5), which will be described later. In this case, the roller (130) may be formed integrally by combining with the vane (140). A detailed description of the structure and shape of the rolling piston (100) will be provided later through other drawings below.

[0049] The shaft (40) may include an oil passage (45). Oil may be supplied from the inlet (43) at the bottom of the shaft (40) to the top of the shaft (40) through the oil passage (45).

[0050] An oil passage (45) can be formed in the shaft (40) that penetrates the upper and lower ends of the shaft (40). The oil passage (45) can be formed with a predetermined diameter centered on the rotation axis (47) of the shaft (40). Oil stored in the lower part of the housing (10) can move along the shaft (40) to the upper part of the shaft through the oil passage (45).

[0051] An inlet (43) may be provided at the bottom of the shaft (40) so as to be in communication with the oil passage (45) to allow oil to flow into the oil passage (45). Oil stored in the lower part of the housing (10) may flow into the oil passage (45) through the inlet (43).

[0052] A pump (46) for guiding the movement of oil may be provided at the lower part of the shaft (40). The pump (46) may be provided inside the oil passage (45) and may be located directly above the inlet (43). The pump (46) may be provided in a roughly threaded shape.

[0053] The pump (46) may be fixed to the inside of the shaft (40) and arranged to rotate together with the rotation of the shaft (40). As the pump (46) rotates, oil introduced through the inlet (43) may move to the upper part of the shaft (40). Oil introduced to the lower part of the shaft (40) may rise along the incline of the rotating pump (46).

[0054] The oil rising along the oil passage (45) is supplied to the member of the compression section (20) through the supply passage (41) provided on the shaft (40) for at least a portion, and the remaining oil that is not supplied can be discharged through the outlet (44) provided on the upper side of the shaft.

[0055] FIG. 2 is an enlarged view of the area corresponding to part A of FIG. 1 of a compressor according to an embodiment of the present invention. FIG. 3 is a cross-sectional view in the direction corresponding to the BB direction of FIG. 2 of the compression section of a compressor according to an embodiment of the present invention. FIG. 4 is a cross-sectional view in the direction corresponding to the BB direction of FIG. 2 of the compression section of a compressor according to an embodiment of the present invention.

[0056] Referring to FIGS. 2 to 4, the compression section (20) may include a cylinder (21) comprising a first cylinder and a second cylinder spaced apart along the direction of the rotation axis (47), and a disc-shaped mid plate (23) that partitions the space between the first cylinder and the second cylinder.

[0057] Additionally, the compression section (20) may be positioned above the second cylinder to cover the second cylinder and may also be equipped with a main bearing (33) that rotatably supports the shaft (40).

[0058] Additionally, the compression section (20) may be provided with a sub-bearing (34) that is positioned below the first cylinder to cover the first cylinder and rotatably supports the shaft (40).

[0059] The main bearing (33) can be fixed to the housing (10) by welding or the like. The sub-bearing (34) can be fixed to the main bearing (33) by fastening members such as bolts.

[0060] Additionally, the compression section (20) may include an operating chamber (25) having a first operating chamber formed by a first cylinder, a mid plate (23), and a sub-bearing (34), and a second operating chamber formed by a second cylinder, a mid plate (23), and a main bearing (33).

[0061] The compression section (20) may include a rolling piston (100) that is fitted into the eccentric portion (42) of the shaft (40) within the operating chamber (25). The rolling piston (100) may be equipped with a roller (130) that rotates and pivots according to the rotation of the shaft (40), and a vane (140) integrally coupled to the outer surface of the roller (130). The operating chamber (25) may be divided into a suction chamber (24) and a compression chamber (22) by the roller (130) and the vane (140).

[0062] Specifically, the outer surface of the roller (130) of the rolling piston (100) rotates while in contact with the inner surface of the cylinder (21), and the vane (140) of the rolling piston (100) can be accommodated in a bush (26) provided between the inner surface and the outer surface of the cylinder (21). Accordingly, the integrally combined roller (130) and vane (140) can divide the interior of the cylinder (21) into two parts. In other words, the rolling piston (100) can divide the operating chamber (25) into an intake chamber (24) and a compression chamber (22).

[0063] In the cylinder (21), a suction port (7) is formed that penetrates in a direction perpendicular to the axial direction of the shaft (40) (radial direction) so as to communicate with the suction chamber (24) and the outside of the cylinder (21). Additionally, a discharge port (not shown) that penetrates in the axial direction of the shaft (40) may be formed on the outside of the operating chamber (25) of the cylinder (21).

[0064] Specifically, the cylinder (21) may have an intake port (7) on one side of the vane (140) and an exhaust port (not shown) on the other side. In other words, the cylinder (21) may have an intake chamber (24) on one side of the vane (140) and a compression chamber (22) on the other side.

[0065] The central axis (107) of the roller (130) of the rolling piston (100) may be eccentrically offset to one side from the rotation axis (47) of the shaft (40). The shaft (40) may be provided with an eccentric portion (42) that contacts the roller (130). The eccentric portion (42) contacts the inner circumference of the roller (130) and can transmit the rotational force of the shaft (40) to the roller (130).

[0066] In detail, the eccentric part (42) and the roller (130) in contact with the outer surface of the eccentric part (42) have a central axis (107) arranged to be eccentric with respect to the rotating shaft (40), and the central axis (107) can pivot around the rotation axis (47) of the shaft (40). Accordingly, the roller (130) can pivot while in contact with the inner surface of the cylinder (21).

[0067] The rolling piston (100) can be configured so that the roller (130) and the vane (140) are integrally combined. Accordingly, the roller (130) can rotate together with the eccentric part (42) and at the same time rotate relative to the eccentric part (42).

[0068] The roller (130) can be provided in a roughly ring shape. That is, the inner surface and the outer surface of the roller (130) can each be provided in a circular shape.

[0069] The roller (130) may include an end (131) on the outer surface to which the vane (140) is attached. The vane (140) may protrude in a direction perpendicular to the end (131). At this time, the bush (26) may include a guide portion (27) that can contact the end.

[0070] The cylinder (21) may include a bush (26) in which a vane (140) is received. The bush (26) may be rotatably provided relative to the cylinder (21). Accordingly, the bush (26) may be rotated at a predetermined angle according to the movement of the vane (140) of the rolling piston (100) that is rotating.

[0071] The bush (26) may be provided to guide the movement of the vane (140). The vane (140) may change its position within the cylinder (21) and the angle at which it is received in the bush (26) according to the pivoting motion of the rolling piston (100). The rolling piston (100) may move closer to or further away from the bush (26) while pivoting.

[0072] However, since the bush (26) rotates at a predetermined angle in accordance with the movement of the vane (140), the vane (140) can only perform reciprocating motion in a straight direction with respect to the bush (26). Specifically, even if the rolling piston (100) rotates, the vane (140) can perform reciprocating motion in a straight line with respect to the bush (26) while being accommodated in the bush (26).

[0073] According to one embodiment, the bush (26) may include a through hole (28b) that can be penetrated by a vane (140). The vane (140) may be inserted deepest into the bush (26) when the compression chamber (22) is expanded to its maximum extent. At this time, the vane (140) may be provided to penetrate the through hole (28b) of the bush (26). At this time, the bush (26) may be provided in a roughly cylindrical shape.

[0074] According to one embodiment, the bush (26) may include a receiving portion (28a) to accommodate a vane (140). The vane (140) may be inserted deepest into the bush (26) when the compression chamber (22) is expanded to its maximum extent. At this time, the end of the vane (140) may be arranged to be in contact with the receiving portion (28a) of the bush (26).

[0075] Additionally, the bush (26) may include a guide portion (27) to prevent the vane (140) from deviating from the bush (26) when the vane (140) is furthest from the bush (26). The guide portion (27) may be formed to protrude inwardly from one side of the bush (26) toward the cylinder (21). The shape of the bush (26), excluding the guide portion (27), may be approximately cylindrical.

[0076] Additionally, the rolling piston (100) may include an end (131) on the outer surface of the roller (130) so that its movement is not hindered by the guide portion (27) when it is closest to the bush (26).

[0077] The rolling piston (100) can compress the refrigerant while performing a pivoting motion that moves away from and closer to the bush (26). Specifically, when the shaft (40) is rotated by the drive motor (30), the roller (130) of the rolling piston (100) can pivot according to the rotation of the eccentric part (42). That is, due to the eccentric rotation of the rolling piston (100), the suction chamber (24) and the compression chamber (22) of the operating chamber (25) can repeatedly contract and expand.

[0078] When the suction chamber (24) expands, refrigerant gas can be sucked in through the suction port (7). The refrigerant gas sucked into the suction chamber (24) is compressed as the compression chamber (22) contracts, and when the pressure reaches a predetermined discharge pressure, it can be discharged into the housing (10) through the discharge port (not shown).

[0079] At this time, the vane (140) is housed in a bush (26) provided on one side of the cylinder (21) and can divide the space inside the cylinder (21) into a suction chamber (24) and a compression chamber (22). That is, the vane (140) is installed between the suction port (7) connected to the suction pipe (6) and the discharge port (not shown) of the cylinder (21), so that when the eccentric part (42) rotates toward the discharge port (not shown), the refrigerant is sucked in through the suction port (7) via the accumulator (2) and the suction pipe (6) by the suction force, and high-temperature, high-pressure refrigerant is discharged to the discharge port (not shown) of the cylinder (21).

[0080] The shaft (40) may include an oil passage (45) on its inner side. Oil introduced from the inlet (43) at the bottom of the shaft (40) may travel along the oil passage (45) to the upper side of the shaft (40) and be discharged through the outlet (44) at the top of the shaft (40). At least a portion of the oil traveling through the oil passage (45) may be supplied to the main bearing (33), sub-bearing (34), and eccentric part (42) through a supply passage (41) that is provided to penetrate the side of the shaft (40) radially. One side of the supply passage (41) may be provided to be connected to a D-cut portion formed on the side of the shaft (40). The oil supplied to the main bearing (33) and sub-bearing (34) may form an oil film so that the shaft (40) is rotatably supported between the side of the shaft (40) and the main bearing (33) and sub-bearing (34). The oil supplied to the eccentric part (42) can be arranged to form an oil film between the outer surface of the eccentric part (42) and the inner surface of the roller (130) to support the load generated as the refrigerant is compressed in the compression chamber.

[0081] The rolling piston (100) fitted into the eccentric portion (42) may include a first member (110) and a second member (120) in the vertical direction. The first member (110) and the second member (120), which are provided in the first cylinder located on the lower side of the compression portion (20), may be supported between the sub-bearing (34) and the mid-plate (23). In other words, the lower surface of the first member (110) is supported by the upper surface of the sub-bearing (34), and the upper surface of the second member (120) is supported by the lower surface of the mid-plate (23), so that the upper surface of the first member (110) and the lower surface of the second member (120) can come into contact with each other.

[0082] Likewise, the first member (110) and the second member (120), which are provided in the second cylinder located above the compression section (20), can be supported between the main bearing (33) and the mid plate (23). In other words, the lower surface of the first member (110) is supported by the upper surface of the mid plate (23), and the upper surface of the second member (120) is supported by the lower surface of the main bearing (33), so that the upper surface of the first member (110) and the lower surface of the second member (120) can come into contact with each other.

[0083] A rolling piston (100) comprising a first member (110) and a second member (120) may include a sealing element to prevent oil supplied from the oil passage (45) to the eccentric part (42) from leaking into the compression chamber (22). In other words, the rolling piston (100) may be configured to block oil forming an oil film from flowing into the compression chamber (22). A detailed description of the configuration of the rolling piston (100) and the sealing element will be provided later through other drawings below.

[0084] FIG. 5 is a perspective view of a rolling piston shape according to an embodiment of the present invention. FIG. 6 is a cross-sectional perspective view of the CC direction cross section of FIG. 5. FIG. 7 is a cross-sectional view of a rolling piston according to an embodiment of the present invention cut in the CC direction of FIG. 5. FIG. 8 is a cross-sectional view of a rolling piston according to an embodiment of the present invention cut in the CC direction of FIG. 5.

[0085] Referring to FIGS. 5 to 8, the rolling piston (100) may be provided as an integral unit in which the roller (130) and the vane (140) are integrally combined. Additionally, the rolling piston (100) may include an internal space (150) formed in a hollow shape along the circumference of the roller (130) on the inner side of the roller (130).

[0086] The rolling piston (100) may include a first member (110) and a second member (120) that are arranged to be divided in the vertical direction. The first member (110) may form the lower part of the rolling piston (100), and the second member (120) may form the upper part of the rolling piston (100).

[0087] The upper surface of the first member (110) may be recessed to form a first groove (115). The lower surface of the second member (120) may be recessed to form a second groove (125). The first groove (115) and the second groove (125) may each be provided along the circumference of the roller (130) between the outer surface and the inner surface of the roller (130).

[0088] The upper surface of the first member (110) in which the first groove (115) is formed and the lower surface of the second member (120) in which the second groove (125) is formed can be arranged to be in contact with each other. At this time, the first groove (115) and the second groove (125) may coincide to form a single internal space (150). In other words, the location where the first groove (115) is formed and the location where the second groove (125) is formed correspond to each other, so that when the first member (110) and the second member (120) are in contact, the first groove (115) and the second groove (125) are connected to each other.

[0089] The first groove (115) and the second groove (125) can each be provided in a ring shape. Accordingly, the diameter of the first inner surface (116) of the first groove (115) and the second inner surface (126) of the second groove (125) can be larger than the diameter of the inner surface of the roller (130), and the diameter of the first outer surface (117) of the first groove (115) and the second outer surface (127) of the second groove (125) can be provided to be smaller than the outer surface of the roller (130). Accordingly, the internal space (150) formed by the combination of the first groove (115) and the second groove (125) can be provided in a ring shape.

[0090] At this time, the first groove (115) and the second groove (125) can be provided with the same shape, and accordingly, the first member (110) and the second member (120) can be provided with a shape symmetric to the contact surface.

[0091] According to one embodiment of the present invention, a rolling piston (100) including an internal space (150) is provided by being divided vertically into a first member (110) and a second member (120), so that the rolling piston (100) can be provided in a way that facilitates manufacturing. For example, since the internal space (150) of the rolling piston (100) is formed by a first groove (115) and a second groove (125) formed in the first member (110) and the second member (120), respectively, the rolling piston (100) can be manufactured through a mold manufacturing process. Specifically, the first groove (115) and the second groove (125) provided in the first member (110) and the second member (120) can be provided to communicate with the outside of the first member (110) and the second member (120), respectively, during the manufacturing process before the first member (110) and the second member (120) are combined. Accordingly, a rolling piston (100) including an internal space (150) can be produced by combining the first member (110) and the second member (120) produced through the mold manufacturing process.

[0092] Additionally, the first groove (115) and the second groove (125) forming the internal space (150) of the rolling piston (100) may be formed on the surfaces of the first member (110) and the second member (120) prior to the combination of the first member (110) and the second member (120). Accordingly, the first groove (115) and the second groove (125) of the first member (110) and the second member (120) may be formed so that the shape of the grooves produced through the mold manufacturing process can be visually confirmed. Accordingly, the defect rate in the manufacturing process of the rolling piston (100) including the internal space (150) may be reduced.

[0093] The rolling piston (100) is provided with a first member (110) and a second member (120), and may further include a sealing element to be described later in the first member (110). For example, the rolling piston (100) may include a third groove (118) or a stepped portion (119), which is an additional sealing element, in the first member (110) in addition to the sealing surface formed between the first member (110) and the second member (120). A detailed description of the sealing element will be provided later through other drawings below.

[0094] The thickness of the vane (140) in the rolling piston (100) may be configured to be smaller than the thickness of the roller (130). Accordingly, the vane (140) of the first member (110) and the second member (120) may not have a groove formed to create an internal space on the inner side of the vane (140). In other words, the vane (140) of the rolling piston (100) may not have an internal space (150). Accordingly, the vane (140) may be configured to have higher rigidity than when it includes an internal space (150).

[0095] The roller (130) of the rolling piston (100) may include an inner wall portion having a diameter smaller than the inner surface of the inner space (150) and an outer wall portion having a diameter larger than the outer surface of the inner space (150). In other words, the first member (110) may include a first inner wall portion (111) including the first inner surface (116) of the first groove (115) and a first outer wall portion (112) including the first outer surface (117) of the first groove (115). Additionally, the second member (120) may include a second inner wall portion (121) including the second inner surface (126) of the second groove (125) and a second outer wall portion (122) including the second outer surface (127) of the second groove (125).

[0096] The outer wall of the rolling piston (100) may include a sealing element to prevent oil passing through the inner surface of the rolling piston (100) from flowing into the compression chamber (22).

[0097] According to one embodiment, a third groove (118) capable of accommodating an o-ring may be provided on the upper surface of the first outer wall portion (112) of the first member (110). The third groove (118) may be provided between the outer surface of the roller (130) and the first outer surface (117) of the first groove (115), and may be provided in a ring shape along the circumference of the roller (130).

[0098] The third groove (118) may be formed by recessing the upper surface of the first outer wall portion (112). An o-ring may be accommodated in the third groove (118) to block the movement of oil from the central axis of the roller (130) toward the outer surface of the roller (130). However, this embodiment is not limited to this, and even if an o-ring is not accommodated in the third groove (118), the movement of oil from the central axis of the roller (130) toward the outer surface of the roller (130) may be blocked.

[0099] According to one embodiment, a stepped portion (119) may be provided on the upper surface of the first outer wall portion (112) of the first member (110). The stepped portion (119) may be formed by protruding in a vertical direction relative to the upper surface of the first outer wall portion (112). The stepped portion (119) may be formed along the circumference of the first outer surface (117) of the first groove (115). Accordingly, the stepped portion (119) may be provided in a ring shape, and the diameter of the inner surface of the stepped portion (119) may be the same as the diameter of the first outer surface (117) of the first groove (115).

[0100] At this time, the second groove (125) of the second member (120) may be provided to have a greater thickness than the first groove (115) of the first member (110). In other words, the gap between the second outer surface (127) and the second inner surface (126) of the second groove (125) may be provided to be greater than the gap between the first outer surface (117) and the first inner surface (116) of the first groove (115).

[0101] More specifically, the gap between the second outer surface (127) and the second inner surface (126) of the second groove (125) can be arranged to be the same as the gap between the outer surface of the stepped portion (119) of the first member and the first inner surface (116) of the first groove (115). Accordingly, the second outer surface (127) of the second groove (125) can come into contact with the outer surface of the stepped portion (119). Accordingly, when the first member (110) and the second member (120) come into contact, the stepped portion (119) of the first member (110) can be received in the second groove (125) of the second member (120).

[0102] At this time, the length corresponding to the thickness of the first outer wall portion (112) of the first member (110) can be referred to as the sealing distance (151). In other words, the distance between the outer surface of the roller (130) and the first outer surface (117) of the first groove (115) can be referred to as the sealing distance (151). This may refer to the sealing distance (151) of the first outer wall portion (112). In addition, this may refer to the sealing distance (151) of the rolling piston (100).

[0103] That is, the sealing distance (151) may include the radial thickness of the third groove (118) or step portion (119) formed in the first outer wall portion (112). At this time, the sealing distance (151) may be provided to be 2 mm or more.

[0104] As the sealing distance (151) is provided to be 2mm or more, the movement of oil from the central axis of the roller (130) toward the outer surface of the roller (130) can be blocked. In other words, as the sealing distance (151) is provided to be 2mm or more, the oil supplied to the inner surface of the roller (130) can be blocked from flowing into the compression chamber (22).

[0105] Additionally, the contact surface between the upper surface of the first outer wall part (112) and the lower surface of the second outer wall part (122) may be referred to as a sealing surface. In this case, the sealing distance (151) may mean a radial length that includes a length added by the sealing element to the length corresponding to the thickness of the sealing surface.

[0106] For example, the sealing distance (151) of the first outer wall portion (112) including the third groove (118) may mean a length including a length corresponding to the thickness of the sealing surface formed by the contact between the first outer wall portion (112) and the second outer wall portion (122) and a length corresponding to the thickness of the third groove (118).

[0107] More specifically, when the first outer wall portion (112) includes the third groove (118), the first outer wall portion (112) may have a sealing surface formed on the inner and outer sides in the radial direction relative to the third groove (118) that contacts the second outer wall portion (122). Accordingly, the portion corresponding to the third groove (118) may not be included in the sealing surface. That is, the total thickness of the sealing surface and the third groove (118) in the radial direction may be equal to the distance between the outer surface of the roller (130) and the first outer surface (117) of the first groove (115).

[0108] Additionally, the sealing distance (151) of the first outer wall portion (112) including the step portion (119) may mean a length that includes both the length corresponding to the thickness of the sealing surface formed by the contact between the first outer wall portion (112) and the second outer wall portion (122) and the length corresponding to the thickness of the step portion (119).

[0109] In the same way, the sealing distance of the first inner wall portion (111) can also be defined. The sealing distance of the first inner wall portion (111) may mean a length corresponding to the thickness of the first inner wall portion (111) and the first outer wall portion (112).

[0110] A compressor (1) according to one embodiment comprises a housing (10), a drive motor (30) including a rotor (32) and a stator (31), a shaft (40) having an eccentric portion (42) to transmit power generated from the drive motor (30) to a compression unit (20), a rolling piston (100) including a roller (130) that contacts the outer surface of the eccentric portion (42) and has an internal space (150) on the inside, and a vane (140) formed integrally with the roller (130), a cylinder (21) that forms a compression chamber (22) together with the rolling piston (100), and a bush (26) provided in the cylinder (21). The rolling piston (100) is divided into upper and lower parts and includes a first member (110) provided in the lower part and a second member (120) provided in the upper part, and on the upper surface of the first member (110) the A first groove (115) is formed along the circumference of the roller (130), and a second groove (125) is formed along the circumference of the roller (130) on the lower surface of the second member (120), and the upper surface of the first member (110) where the first groove (115) is formed and the lower surface of the second member (120) where the second groove (125) is formed are arranged to be in contact with each other.

[0111] The first groove (115) and the second groove (125) may be aligned with each other to form an internal space (150) on the inner side of the rolling piston (100).

[0112] The first member (110) may include a third groove (118) provided on the upper surface to accommodate an o-ring.

[0113] The third groove (118) can be provided between the first groove (115) and the outer surface of the roller (130).

[0114] The first member (110) may include a stepped portion (119) formed on the upper surface along the perimeter of the first groove (115) and protruding from one side of the first member (110).

[0115] The above step portion (119) can be provided between the first groove (115) and the outer surface of the roller (130).

[0116] The outer side of the second groove (125) may be arranged to be in contact with the outer surface of the stepped portion (119).

[0117] The above step portion (119) may be received in the second groove (125) so that the first member (110) and the second member (120) are combined.

[0118] The thickness of the vane (140) can be made smaller than the thickness of the roller (130).

[0119] The above internal space (150) may be provided so as not to extend into the interior of the vane (140).

[0120] The rolling piston (100) may include ends (131) formed along the axial direction on each side of the vane (140) on the outer surface.

[0121] The volume of the internal space (150) can be provided as 1 / 4 of the volume of the rolling piston (100).

[0122] A compressor (1) according to one embodiment comprises a housing (10), a shaft (40) including an eccentric portion (42) having an oil passage (45) formed therein, a rolling piston (100) including a roller (130) which is arranged to be divided vertically and has an internal space (150) on the inside, and a vane (140) which is integrally coupled to the roller (130), a cylinder (21) which forms a compression chamber (22) together with the rolling piston (100), and a bush (26) which is provided in the cylinder (21) and is provided to accommodate the vane (140), and is arranged so as to block the movement of oil flowing into the side of the eccentric portion (42) through the oil passage (45) to the compression chamber (22).

[0123] The above rolling piston (100) includes a first member (110) having a first groove (115) provided at the bottom and a second member (120) having a second groove (125) provided at the top, and the first groove (115) and the second groove (125) may be arranged to face each other to form the internal space (150).

[0124] The first member (110) includes a first outer wall portion (112) and a first inner wall portion (111) on both sides of the first groove (115), and the second member (120) includes a second outer wall portion (122) and a second inner wall portion (121) on both sides of the second groove (125), and the upper surface of the first outer wall portion (112) and the lower surface of the second outer wall portion (122) can come into contact to form a sealing surface.

[0125] The above rolling piston (100) can be provided with a sealing distance (151) of 2 mm or more.

[0126] A third groove (118) may be provided on the first outer wall portion (112) to accommodate an o-ring.

[0127] A stepped portion (119) may be formed on the inner side of the first outer wall portion (112).

[0128] The sealing distance (151) of the first outer wall portion (112) can be provided to be longer than the sealing distance of the first inner wall portion (111).

[0129] The first member (110) and the second member (120) can be arranged symmetrically with respect to the contact surface.

[0130] According to the concept of the present invention, since an internal space is provided on the inner side of the rolling piston of the compressor, vibration caused by eccentricity can be reduced during the operation of the compressor.

[0131] According to the concept of the present invention, since no internal space is provided in the vane of the rolling piston of the compressor, the vane can be provided to have high rigidity during the operation of the compressor.

[0132] According to the concept of the present invention, since the weight of the rolling piston of the compressor is reduced, the loss applied to the bush during compression can be reduced.

[0133] Specific embodiments have been illustrated and described above. However, the invention is not limited to the embodiments described above, and those skilled in the art may make various modifications without departing from the essence of the technical concept of the invention as described in the following claims.

Claims

1. Housing; A drive motor including a rotor and a stator; A shaft having an eccentric portion to transmit power generated by the above-mentioned drive motor to a compression portion; A rolling piston comprising a roller that contacts the outer surface of the eccentric portion and has an internal space on the inside, and a vane formed integrally with the roller; A cylinder forming a compression chamber together with the above-mentioned rolling piston; and Includes a bush provided in the above cylinder, The above-described rolling piston comprises a first member provided at the bottom and a second member provided at the top, wherein a first groove is formed along the circumference of the roller on the upper surface of the first member and a second groove is formed along the circumference of the roller on the lower surface of the second member, and the upper surface of the first member having the first groove formed and the lower surface of the second member having the second groove formed are arranged to be in contact with each other.

2. In Paragraph 1, A compressor in which the first groove and the second groove are aligned with each other to form the internal space on the inner side of the rolling piston.

3. In Paragraph 2, The above first member is a compressor comprising a third groove provided on the upper surface to accommodate an o-ring.

4. In Paragraph 3, The above third groove is a compressor provided between the above first groove and the outer surface of the roller.

5. In Paragraph 2, A compressor comprising a first member having a stepped portion formed on the upper surface along the perimeter of the first groove, protruding from one side of the first member.

6. In Paragraph 5, The above step portion is a compressor provided between the first groove and the outer surface of the roller.

7. In Paragraph 6, A compressor in which the second outer surface of the second groove is arranged to contact the outer surface of the stepped portion.

8. In Paragraph 6, A compressor in which the above-mentioned step portion is received in the above-mentioned second groove so as to combine the above-mentioned first member and the above-mentioned second member.

9. In Paragraph 1, A compressor configured such that the thickness of the vane is smaller than the thickness of the roller.

10. In Paragraph 9, A compressor configured such that the above internal space does not extend into the interior of the vane.

11. In Paragraph 10, The above rolling piston is a compressor comprising ends formed along the axial direction on each side of the vane on the outer surface.

12. In Paragraph 1, A compressor in which the volume of the internal space is 1 / 4 of the volume of the rolling piston.

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