Scroll compressor

Abstract

The present invention provides a scroll compressor comprising a casing, a main frame, a rotary shaft, an orbiting scroll, a fixed scroll, and an Oldham ring slidably coupled to the orbiting scroll to prevent axial rotation of the orbiting scroll, the Oldham ring including: a ring body having an annular shape and disposed between the main frame and the orbiting scroll to be supported in the axial direction of the rotary shaft; and key units extending in the axial direction of the ring body, slidably inserted into key accommodation portions provided in the orbiting scroll or the main frame, and having concave portions provided on the outside, wherein the concave portions are arranged so as not to deviate from the radial range of the ring body.

Description

Scroll compressor

[0001] The present invention relates to a scroll compressor.

[0002] In a scroll compressor, a rotating scroll and a non-rotating scroll are coupled together, and as the rotating scroll rotates relative to the non-rotating scroll, two pairs of compression chambers are formed.

[0003] The compression chamber consists of a suction pressure chamber formed on the outer edge, an intermediate pressure chamber formed continuously with gradually decreasing volume from the suction pressure chamber toward the center, and a discharge pressure chamber connected to the center of the intermediate pressure chamber. Generally, the suction pressure chamber is formed by penetrating the side of the non-rotating scroll, the intermediate pressure chamber is sealed, and the discharge pressure chamber is formed by penetrating the end plate portion of the non-rotating scroll.

[0004] Scroll compressors can be classified into low-pressure and high-pressure types depending on the path through which the refrigerant is drawn. In the low-pressure type, the refrigerant suction pipe is connected to the internal space of the casing, and the low-temperature suction refrigerant passes through the internal space of the casing before being guided to the suction pressure chamber. In the high-pressure type, the refrigerant suction pipe is directly connected to the suction pressure chamber, so that the refrigerant is guided directly to the suction pressure chamber without passing through the internal space of the casing.

[0005] Meanwhile, the scroll compressor may be equipped with an anti-rotation member that prevents a scroll (e.g., a rotary scroll) receiving rotational force from a drive motor from rotating relative to another scroll (e.g., a stationary scroll) or a stationary frame.

[0006] Oldham rings and pin-and-rings are commonly known as anti-rotation components. Oldham rings offer advantages over pin-and-rings in terms of ease of assembly. Recently, technology has been introduced to reduce weight while maintaining the necessary rigidity by using different materials for the ring body and the key that make up the Oldham ring.

[0007] The Oldham ring component of a compressor is a part that prevents the rotation of the slewing scroll, and generally has a structure in which the key of the Oldham ring contacts the groove of the slewing scroll and the main frame to operate.

[0008] Patent Document 1 (Korean Published Patent Application No. 10-2021-0101493) is configured to include flat and curved shapes on the side portion of the Oldham ring key, and the shape of the side portion increases the magnitude of the oil film pressure formed between the Oldham ring, the rotating scroll, and the main frame, thereby increasing the load-bearing capacity of the Oldham ring and preventing wear.

[0009] However, the scroll compressor in Patent Document 1 had a problem of reduced productivity because it required high-precision machining. In addition, if the oil film was not properly formed, there was a risk that the load-bearing capacity would drop sharply compared to the existing Oldham ring, and there was a possibility of greater wear occurring due to the reduced contact area.

[0010] Patent Document 2 (JP 2018-204488) discloses a scroll compressor in which a key portion protrudes from the annular portion in the direction of the central axis extension of at least the annular portion, and is movably disposed within a fixed guide groove or a movable guide groove, and a recess having two opposing side walls is provided on at least one surface of the key portion.

[0011] In conventional scroll compressors, wear on the Oldham ring mostly occurs at the tip of the Oldham ring key. This is because the rotational force of the slewing scroll is transmitted to the Oldham ring key, causing linear contact between the tip of the Oldham ring key, the slewing scroll, and the main frame, rather than surface contact.

[0012] This causes wear on the Oldham ring, and if the wear on the Oldham ring becomes excessive, the slewing scroll rotates, causing wear on the slewing scroll lap and the stationary scroll lap, which leads to compressor failure.

[0013] Therefore, the development of a structure capable of reducing the wear of the Oldham ring is required.

[0014] The present invention has been devised to solve the above-mentioned problems, and the first objective of the present invention is to provide a scroll compressor with a structure that induces deformation of the Oldham linkage when subjected to an excessive load, thereby preventing friction or wear occurring at the end of the Oldham linkage and further reducing noise.

[0015] In particular, the present invention provides a scroll compressor having a structure for reducing wear of the Oldham ring occurring at the end of the Oldham ring key, wherein the rotational force of the slewing scroll is transmitted to the Oldham ring key, and the end of the Oldham ring key, the slewing scroll, and the main frame are in surface contact rather than line contact.

[0016] In addition, the present invention provides a scroll compressor with a structure capable of reducing the cause of failure of the compressor that occurs when wear of the Oldham ring is induced, as excessive wear of the Oldham ring causes the rotating scroll to rotate and wear of the wrap of the rotating scroll and the wrap of the stationary scroll is induced.

[0017] To solve the above problem, the scroll compressor of the present invention comprises: a casing; a main frame provided inside the casing; a rotating shaft supported by the main frame; a pivot scroll coupled to the rotating shaft and supported by the main frame; a fixed scroll fixed to the main frame and engaged with the pivot scroll to form a compression chamber; and an Oldham ring slidably coupled to the pivot scroll to prevent rotation of the pivot scroll, wherein the Oldham ring comprises: a ring body formed in an annular shape and provided between the main frame and the pivot scroll and supported in the axial direction of the rotating shaft; and a key part extending axially from the ring body and slidably inserted into a key receiving part provided on the pivot scroll or the main frame, wherein a recess is provided on the outer side of the key part, and the recess is arranged so as not to deviate from the ring body in the radial direction.

[0018] As a result, when the rotational force generated in the slewing scroll is transmitted to the Oldham ring and contact occurs between the end of the Oldham ring key and the end plate of the slewing scroll and the main frame, deformation of the end of the Oldham ring key is induced to induce surface contact rather than line contact, and the impact force or stress generated in the Oldham ring can be dissipated.

[0019] The above ring body may have a concave support portion that protrudes radially to support the concave portion from one side.

[0020] As a result, the ring body can support the concave portion more stably, thereby inducing deformation of the concave portion and dissipating the impact force or stress generated in the Oldham ring.

[0021] According to one example related to the present invention, the concave portion may be formed to be concave in the shape of a semicircle.

[0022] The above-mentioned concave portion may include: a deformable end portion provided on both sides of the key portion and deformed by being pressed upon contact with the pivot scroll or the key receiving portion of the main frame; and a deformable support portion provided between the deformable end portions on both sides and having a semicircular shape to support the deformable end portion from the inside and induce deformation of the deformable end portion.

[0023] Preferably, the deformation end may be formed as a curved surface.

[0024] According to another example related to the present invention, the concave portion may be formed with at least two intersecting surfaces.

[0025] The above-mentioned concave portion may include polygonal protrusions formed protruding in a polygonal structure and provided on both sides of the key portion; and polygonal support portions provided between the polygonal protrusions and formed concavely in a polygonal structure to support the polygonal protrusions so as to allow for deformation.

[0026] The polygonal protrusion has a predetermined thickness in a direction intersecting the radial direction, and the polygonal support has a predetermined depth in the radial direction, and the polygonal protrusion and the polygonal support can satisfy [Equation 1].

[0027] [Mathematical Formula 1]

[0028] H t / {(t m1 +t m2 ) / 2} > 1

[0029] Here, H t is the radial depth of the polygonal support, t m1 is the thickness in the direction intersecting the radial direction of the polygonal protrusion on one side, t m2 is the thickness in the direction intersecting the radial direction of the polygonal protrusion on the other side.

[0030] The above-mentioned concave support may be provided with a lateral support that extends to be rounded laterally so as to support the deformation of the concave portion laterally.

[0031] As a result, the ring body can support the concave portion more stably, thereby inducing deformation of the concave portion and dissipating the impact force or stress generated in the Oldham ring.

[0032] Preferably, the key portion of the Oldham ring does not protrude radially to the outside of the concave support portion and may not protrude further laterally to the outside of the lateral support portion.

[0033] The above-mentioned concave portion is formed to be concave in the radial direction at the outer end of the key portion and can be positioned on the inner side of the outer circumference of the ring body.

[0034] The above-mentioned concave portion is further provided at the inner end in the radial direction of the key portion, and the concave portion at the inner end of the key portion can be arranged so as not to extend into the inner side of the ring body.

[0035] As a result, even at the inner end of the key portion, the key portion is deformed by the key receiving portion, thereby preventing friction or wear occurring on the inner side of the Oldham ring's key portion and reducing noise.

[0036] The above-mentioned concave support member may further include a concave support groove member that is provided in a shape that aligns with the concave member and is arranged parallel to the concave member in the axial direction.

[0037] Due to this structure, when the concave portion is deformed by the key receiving portion, the concave support groove portion can also be deformed together with the concave portion, thereby further preventing friction and wear occurring at the end of the key portion of the Oldham ring.

[0038] To solve another problem, the scroll compressor of the present invention comprises: a plurality of scrolls including a pivot scroll that interlocks with one another and in which at least one scroll is coupled to a rotation axis to perform a pivoting motion; and an Oldham ring that is slidably coupled to the pivot scroll to prevent rotation of the pivot scroll, wherein the Oldham ring comprises: a ring body that is formed in an annular shape and is axially supported and slidably coupled to the pivot scroll; and a key part that extends axially from the ring body and is slidably inserted into a key receiving part provided in the pivot scroll, wherein a recess is provided on the outer side of the key part and the recess is arranged so as not to deviate from the ring body in the radial direction.

[0039] As a result, when the rotational force generated in the slewing scroll is transmitted to the Oldham ring and contact occurs between the end of the Oldham ring key and the end plate of the slewing scroll and the main frame, deformation of the end of the Oldham ring key is induced to induce surface contact rather than line contact, and the impact force or stress generated in the Oldham ring can be dissipated.

[0040] The above-mentioned concave portion may be formed to be concave in the shape of a semicircle.

[0041] The above-mentioned concave portion may include: a deformable end portion provided on both sides of the key portion and deformed by being pressed upon contact with the key receiving portion of the pivot scroll; and a deformable support portion provided between the deformable end portions on both sides and having a semicircular shape to support the deformable end portion from the inside and induce deformation of the deformable end portion.

[0042] The above-mentioned concave portion may be formed with at least two intersecting surfaces.

[0043] The above-mentioned concave portion may include polygonal protrusions formed protruding in a polygonal structure and provided on both sides of the key portion; and polygonal support portions provided between the polygonal protrusions and formed concavely in a polygonal structure to support the polygonal protrusions so as to allow for deformation.

[0044] The polygonal protrusion has a predetermined thickness in a direction intersecting the radial direction, and the polygonal support has a predetermined depth in the radial direction, and the polygonal protrusion and the polygonal support can satisfy [Equation 1].

[0045] [Mathematical Formula 1]

[0046] H t / {(t m1 +t m2 ) / 2} > 1

[0047] Here, H t is the radial depth of the polygonal support, t m1 is the thickness in the direction intersecting the radial direction of the polygonal protrusion on one side, t m2 is the thickness in the direction intersecting the radial direction of the polygonal protrusion on the other side.

[0048] As a result, the deformation caused by the load increases, so problems such as the key (162)(163) breaking can be prevented, and deformation of the polygonal protrusion occurs, so that the effect of the concave part can occur.

[0049] The above-mentioned concave portion may be formed to penetrate the ring body in the axial direction.

[0050] The scroll compressor of the present invention is provided with a concave portion at the end of the Oldham ring key so that when the rotational force generated in the rotating scroll is transmitted to the Oldham ring and contact occurs between the end of the Oldham ring key and the rotating scroll end plate and main frame, deformation of the end of the Oldham ring key is induced to induce surface contact rather than line contact, thereby enabling the dissipation of impact force or stress generated in the Oldham ring.

[0051] The scroll compressor of the present invention forms a structure in which the key portion of the Oldham ring is coupled to the key receiving portion of the pivot scroll or main frame, thereby securing the radial design space of the scroll compressor.

[0052] The scroll compressor of the present invention is further provided with a concave portion at the inner end of the key portion in the radial direction, so that even at the inner end of the key portion, the key portion is deformed by the key receiving portion, thereby preventing friction or wear occurring on the inner side of the key portion of the Oldham ring and reducing noise.

[0053] The scroll compressor of the present invention is provided with a concave support groove portion that aligns with a concave portion in the ring body of the Oldham ring, so that when the concave portion is deformed by the key receiving portion, the concave support groove portion can also be deformed together with the concave portion, thereby further preventing friction and wear occurring at the end of the key portion of the Oldham ring.

[0054] FIG. 1 is a cross-sectional view illustrating a scroll compressor of the present invention.

[0055] FIG. 2 is an exploded perspective view illustrating the rotating scroll, Oldham ring, and main frame of the present invention.

[0056] FIG. 3 is a plan view illustrating the rotating scroll and Oldham ring of the present invention.

[0057] FIG. 4 is a cross-sectional view illustrating the rotating scroll and Oldham ring of the present invention.

[0058] FIG. 5 is a perspective view illustrating the Oldham ring of the present invention.

[0059] Figure 6 is a conceptual diagram illustrating the direction of wear in the key of an Oldham ring.

[0060] Figure 7 is a graph showing the amount of wear along the wear direction of Figure 6.

[0061] FIG. 8 is a conceptual diagram illustrating an example in which the key portion and the key receiving portion of a conventional Oldham ring make line contact.

[0062] FIG. 9 is a conceptual diagram illustrating an example of surface contact as the key portion of the Oldham ring of the present invention is deformed by the key receiving portion.

[0063] Figure 10 is a graph showing the amount of wear when there is line contact and surface contact along the wear direction.

[0064] FIG. 11 is a perspective view illustrating an example in which a concave portion is formed at the inner end of the key portion.

[0065] FIG. 12 is a perspective view illustrating another embodiment of the concave portion of the present invention.

[0066] FIG. 13 is a perspective view illustrating an example in which the concave portion of the present invention is formed by penetrating the ring body.

[0067] FIG. 14 is a conceptual diagram illustrating the width of the polygonal protrusion of the concave portion and the depth at which the polygonal support portion is formed.

[0068] Hereinafter, a scroll compressor (1) according to the present invention will be described in detail based on an embodiment illustrated in the attached drawings. In the following description, descriptions of some components may be omitted to clarify the features of the present invention.

[0069] In the following description, "upper side" refers to the direction away from the support surface supporting the scroll compressor (1) according to an embodiment of the present invention, that is, when viewed from the perspective of the electric motor (120) and the compression part, the compression part side is the upper side. "Lower side" refers to the direction closer to the support surface, that is, when viewed from the perspective of the electric motor (120) and the compression part, the electric motor (120) side is the lower side.

[0070] Additionally, the term "axial direction" used in the following description refers to the longitudinal direction of the rotation axis (125). The "axial direction" can be understood as the up and down direction. The "radial direction" refers to the direction intersecting the rotation axis (125).

[0071] The scroll compressor (1) can be classified into a closed type or an open type depending on whether the drive motor and the compression unit are installed together in the internal space of the casing (110). In the closed type, the drive motor and the compression unit are installed together in the internal space of the casing (110), and in the open type, the drive motor (or drive source) is installed outside the casing (110). This embodiment is described using a closed type scroll compressor (1) as a representative example. However, it can be applied in the same way to an open type scroll compressor (1).

[0072] Additionally, the scroll compressor (1) can be classified into a fixed scroll compressor (1) and a mobile scroll compressor (1). The fixed type is typically used for building air conditioning, and the mobile type is used for vehicle air conditioning. This embodiment is described using the fixed scroll compressor (1) as a representative example. However, it can be applied in the same way to the mobile scroll compressor (1).

[0073] Additionally, the scroll compressor (1) can be classified into a low-pressure type or a high-pressure type depending on the pressure of the refrigerant filled in the internal space of the casing (110). In the low-pressure type, the internal space of the casing (110) is filled with refrigerant at suction pressure, and in the high-pressure type, the internal space of the casing (110) is filled with refrigerant at discharge pressure. This embodiment is described using a high-pressure scroll compressor (1) as a representative example. However, it can be applied in the same way to a low-pressure scroll compressor (1).

[0074] Additionally, the scroll compressor (1) can be classified into an upper compression type and a lower compression type depending on the installation position of the compression section. In the upper compression type, the compression section is installed above the drive motor, and in the lower compression type, the compression section is installed below the drive motor. This embodiment is described using an upper compression type scroll compressor (1) as a representative example. However, it can be applied in the same way to a lower compression type scroll compressor (1).

[0075] Additionally, the scroll compressor (1) can be classified into a single-rotation scroll compressor (1) and a mutual-rotation scroll compressor (1) depending on whether the scroll rotates. In the single-rotation scroll compressor (1), one scroll is configured to be fixed or have limited rotational movement while the other scroll is configured to perform a pivotal movement, and in the mutual-rotation scroll compressor (1), both scrolls are configured to rotate. This embodiment is described using the single-rotation scroll compressor (1) as a representative example. However, the same can be applied to the mutual-rotation scroll compressor (1).

[0076] Additionally, the scroll compressor (1) is equipped with an Oldham ring (160), which is an anti-rotation mechanism for the rotating scroll (150). The Oldham ring (160) may be slidably coupled between the rotating scroll (150) and the main frame (130), or slidably coupled between the rotating scroll (150) and the fixed scroll (140) (or the non-rotating scroll (150)). This embodiment is described using an example in which the Oldham ring (160) is provided between the rotating scroll (150) and the main frame (130) as a representative example. However, the same can be applied to an example in which the Oldham ring (160) is provided between the rotating scroll (150) and the fixed scroll (140).

[0077] In addition, the scroll compressor (1) according to the present embodiment can be applied equally throughout the scroll compressor (1) to which the Oldham ring (160) is applied.

[0078] FIG. 1 is a cross-sectional view illustrating the scroll compressor (1) of the present invention. FIG. 2 is an exploded perspective view illustrating the rotary scroll (150), Oldham ring (160), and main frame (130) of the present invention. FIG. 3 is a plan view illustrating the rotary scroll (150) and Oldham ring (160) of the present invention.

[0079] With reference to FIGS. 1 to 3, the overall configuration of the scroll compressor (1) of the present invention is described.

[0080] In the scroll compressor (1) according to the present embodiment, a motor unit (120) that generates rotational force is provided in the internal space (110a) of the casing (110), and a compression unit that compresses refrigerant by operating by the rotational force generated by the motor unit (120) may be provided on one side of the motor unit (120). Accordingly, the scroll compressor (1) according to the present embodiment is provided with the motor unit (120) and the compression unit together in the internal space (110a) of the casing (110) to form a type of sealed scroll compressor (1).

[0081] Referring to FIG. 1, the internal space (110a) of the casing (110) may form a discharge space (110b) above the compression section, an oil separation space (110c) between the compression section and the electric section (120), and a storage space (110d) below the electric section (120) (more specifically, the subframe) (140). A refrigerant suction pipe (115) may be connected so as to pass through the discharge space (110b) and be directly connected to the compression section, and a refrigerant discharge pipe (116) may be connected so as to pass through the casing (110) and be connected to the oil separation space (110c). Accordingly, the scroll compressor (1) according to the present embodiment can form a type of high-pressure scroll compressor (1) by filling the internal space (110a) of the casing (110), specifically the oil separation space (110c) where the electric motor (120) is provided, with the discharge pressure refrigerant discharged from the compression section.

[0082] An oil separator may be provided on the outside of the casing (110) to separate oil from the refrigerant discharged from the internal space (110a) of the casing (110). One end of the oil separator (not shown) may be connected to the internal space of the casing (110), specifically the discharge space (110b), via a refrigerant discharge pipe (116), and the other end of the oil separator (117) may be connected to the oil storage space (110d) of the casing (110), specifically the oil pump (126) to be described later, via an oil recovery pipe (118). Accordingly, the oil discharged together with the refrigerant from the internal space (110a) of the casing (110) may be separated by the oil separator (117) and recovered to the internal space (oil storage space (110d)) (110a) of the casing (110) via the oil pump (126).

[0083] Referring to FIG. 1, the electric motor (120) according to the present embodiment may include a stator (121) and a rotor (122). The stator (121) is fixed to the inner circumference of the casing (110) by hot press fitting, and the rotor (122) may be rotatably provided inside the stator (121). A rotating shaft (125) may be press-fitted and coupled to the center of the rotor (122).

[0084] The upper portion (more precisely, the eccentric portion) of the rotation shaft (125) is rotatably inserted into the main frame (130) to be described later and supported in the radial direction, and the lower portion of the rotation shaft (125) is rotatably inserted into the subframe (140) to be described later and supported in the radial and axial directions. Accordingly, the rotation shaft (125) is supported at both ends by the main frame (130) and the subframe (140) with the drive unit (120) in between, and rotates stably.

[0085] For example, an eccentric part (1251) is provided at the top of the rotation shaft (125) so that the rotation shaft insertion part (152) of the pivot scroll (150), which will be described later, can be rotatably inserted and coupled thereto. The eccentric part (1251) may be inserted and coupled to the rotation shaft insertion part (152), or the rotation shaft insertion part (152) may be inserted and coupled to the eccentric part (1251). This embodiment illustrates an example in which the rotation shaft insertion part (152) is inserted and coupled to the eccentric part (1251) of the rotation shaft (125).

[0086] Referring to FIG. 1, the main frame (130) according to the present embodiment is installed on the upper side of the drive motor (120) and can be fixed to the inner wall surface of the cylindrical shell (111) by hot press fitting or by welding. Accordingly, the main frame (130) can be formed of cast iron.

[0087] The main frame (130) may include a main flange portion (131), an axis support protrusion (132), and an Oldham ring receiving portion (133).

[0088] The main flange portion (131) is formed in an annular shape and can be accommodated in the intermediate space (110c) of the cylindrical shell (111). For example, the outer surface of the main flange portion (131) can be formed in a circular shape and can be in close contact with the inner surface of the cylindrical shell (111). In this case, at least one oil recovery groove (not shown) penetrating in the axial direction can be formed on the outer surface of the main flange portion (131).

[0089] Additionally, the upper surface of the main flange portion (131) may be formed flat, but may be formed with a step difference with the Oldham ring receiving portion (133), which will be described later, in between. For example, the inner side of the Oldham ring receiving portion (133) may be formed such that a thrust surface (1311), on which the pivot scroll (150) is supported in the axial direction, protrudes from the bottom surface of the Oldham ring receiving portion (133) by a predetermined height, and the outer side of the Oldham ring receiving portion (133) may be formed such that a scroll fixing surface (1312), on which the fixed scroll (140) is supported in the axial direction, protrudes from the bottom surface of the Oldham ring receiving portion (133) by a predetermined height. Accordingly, the upper surface of the main flange portion (131) is formed such that the inner side forming the thrust surface (1311) is lower than the outer side forming the scroll fixing surface (1312), so that the pivoting scroll (150) described later can be pivotally provided between the main frame (130) and the fixed scroll (140).

[0090] The shaft support protrusion (132) extends from the main flange portion (131) toward the drive motor (120), and a shaft support hole (1321) may be formed on the inner side of the shaft support protrusion (132). The shaft support hole (1321) may be formed by penetrating both axial sides from the center of the main flange portion (131), that is, the center of the thrust surface (1311). Accordingly, the main flange portion (131) may be formed in an annular shape.

[0091] The Oldham ring receiving portion (133) can be formed in an annular shape by being recessed to a predetermined depth between the upper surface of the main flange portion (131), that is, between the thrust surface (1311) and the scroll fixing surface (1312). Accordingly, the Oldham ring receiving portion (133) forms a predetermined space between the thrust surface (1311) and the scroll fixing surface (1312), and this space can form a kind of back pressure space (S) as oil sucked up through the lubrication hole (1255) of the rotating shaft (125) is stored.

[0092] Additionally, the Oldham ring receiving portion (133) may have a frame-side key receiving portion (1331) formed therein, into which the frame-side key portion (162) of the Oldham ring (160), which will be described later, is inserted so as to slide radially. For example, the frame-side key receiving portion (1331) may be formed by extending radially from the bottom surface of the Oldham ring receiving portion (133). Two frame-side key receiving portions (1331) may be formed along the circumferential direction with a phase difference of approximately 180°. The frame-side key receiving portion (1331) may be understood as a key groove that accommodates the key portions (162) (163) of the Oldham ring (160) so as to be movable relative to each other.

[0093] Referring to FIG. 1, the fixed scroll (140) according to the present embodiment may include a fixed plate portion (141), a fixed side wall portion (142), and a fixed wrap (143).

[0094] The fixed plate portion (141) may be formed in the shape of a disc. The outer surface of the fixed plate portion (141) may be formed to be in close contact with the inner surface of the upper cap (112) forming the upper space (110b), or may be formed to be spaced apart from the inner surface of the upper cap (112).

[0095] Additionally, an intake port (not shown) is formed at the edge of the fixed end plate (141) and penetrates axially to communicate with the intake chamber (not shown), and a refrigerant intake pipe (115) that penetrates the upper cap (112) of the casing (110) can be inserted and connected to the intake port. Accordingly, the refrigerant intake pipe (115) can pass through the upper space (110b) of the casing (110) and communicate directly with the intake port of the fixed scroll (140).

[0096] Additionally, a discharge port (1412) and a bypass hole (not shown) are formed in the center of the fixed end plate (141), and a discharge valve (145) for opening and closing the discharge port (1412) and a bypass valve (not shown) for opening and closing the bypass hole may be installed on the upper surface of the fixed end plate (141). Accordingly, the refrigerant compressed in the compression chamber (V) can be discharged from the upper side of the fixed scroll (140) into the upper space (110b) formed in the upper cap (112).

[0097] The fixed side wall portion (142) can be extended annularly toward the main frame (130) from the edge of the fixed plate portion (141). Accordingly, the lower surface of the fixed side wall portion (142) can be bolted in close contact with the upper surface of the main frame (130), that is, the scroll fixing surface (1312) of the main flange portion (131).

[0098] The fixed wrap (143) can be extended from the lower surface of the fixed plate portion (141) toward the rotating scroll (150). The fixed wrap (143) can be formed in various shapes, such as an involute. The fixed wrap (143) can be coupled with the rotating wrap (153) described later to form two pairs of compression chambers (V).

[0099] Referring to FIGS. 1 to 3, the pivot scroll (150) according to the present embodiment may include a pivot plate portion (151), a rotation axis insertion portion (152), and a pivot wrap (153).

[0100] The pivot plate section (151) is provided between the main frame (130) and the fixed scroll (140) and can be supported axially by the main frame (130). Accordingly, the pivot plate section (151) can perform pivoting motion between the main frame (130) and the fixed scroll (140).

[0101] The rotating plate portion (151) may be formed in the shape of a disc. For example, the outer surface of the rotating plate portion (151) may be formed in a circular shape to correspond to the outer surface of the Oldham ring receiving portion (133), that is, the inner surface of the scroll fixing surface (1312). In this case, the outer diameter of the rotating plate portion (151) may be formed smaller than the inner diameter of the scroll fixing surface (1312). Accordingly, the rotating scroll (150) can rotate smoothly inside the Oldham ring receiving portion (133) without the outer surface of the rotating plate portion (151) interfering with the inner surface of the scroll fixing surface (1312).

[0102] A pivoting wrap (153), to be described later, is formed on one side of the pivoting plate portion (151), and on the other side of the pivoting plate portion (151), that is, on the opposite side facing away from the pivoting wrap (153), a pivoting key receiving portion (1511) into which a pivoting key portion (163) of an Oldham ring (160), to be described later, is slidably inserted may be formed.

[0103] Referring to FIG. 2, the pivot-side key receiving portion (1511) may be formed with a phase difference of approximately 180° along the circumferential direction. However, since the pivot-side key receiving portion (1511) according to the present embodiment is made up of two parts, the pivot-side key receiving portions (1511) corresponding to each other are formed with a phase difference of approximately 180° as described above, but the gap between the pivot-side key receiving portions (1511) adjacent in the circumferential direction may be formed to be less than 180°.

[0104] The pivot side key receiving portion (1511) can be understood as a key groove that receives the key portion (163) of the Oldham ring (160) so as to be movable relative to it.

[0105] Accordingly, the pivot-side key portion (163) of the Oldham ring (160), which will be described later, is slidably inserted into the pivot-side key receiving portion (1511) of the pivot scroll (150), thereby dispersing the force transmitted between the pivot-side key portion (163) and the pivot-side key receiving portion (1511), and thus the surface pressure between the pivot-side key portion (163) and the pivot-side key receiving portion (1511) can be reduced. The pivot-side key receiving portion (1511) will be explained again later together with the pivot-side key portion (163) of the Oldham ring (160).

[0106] The rotational shaft insertion part (152) can extend from the geometric center of the rotating scroll (150) toward the eccentric part (1251) of the rotational shaft (125). The rotational shaft insertion part (152) can be rotatably inserted into the eccentric part (1251) of the rotational shaft (125). Accordingly, the rotating scroll (150) rotates by means of the eccentric part (1251) of the rotational shaft (125) and the rotational shaft insertion part (152).

[0107] The pivot wrap (153) can be extended toward the fixed scroll (140) from one side of the pivot plate section (151). The pivot wrap (153) can be formed in various shapes, such as an involute, to correspond to the fixed wrap (143).

[0108] Referring to FIG. 1, the Oldham ring (160) according to the present embodiment may be provided between the main frame (130) and the pivot scroll (150). However, depending on the case, the Oldham ring (160) may be provided between the fixed scroll (140) and the pivot scroll (150). The present embodiment is described with an example in which the Oldham ring (160) is provided between the main frame (130) and the pivot scroll (150).

[0109] The Oldham ring (160) may include a ring body (161), a frame-side key portion (162), and a pivot-side key portion (163). The ring body (161) is provided between the main frame (130) and the pivot scroll (150), the frame-side key portion (162) is slidably inserted into a frame-side key receiving portion (1331) provided in the main frame (130), and the pivot-side key portion (163) can be slidably inserted into a pivot-side key receiving portion (1511) provided in the pivot scroll (150). Accordingly, the Oldham ring (160) restricts the rotational movement of the pivot scroll (150) so that the pivot scroll (150) performs a pivoting movement relative to the main frame (130).

[0110] The ring body (161) is formed in an annular shape to correspond to the Oldham ring receiving portion (133), the frame-side key portion (162) is formed to correspond to the frame-side key receiving portion (1331), and the pivot-side key portion (163) can be formed parallel to correspond to the pivot-side key receiving portion (1511). The Oldham ring (160) including the pivot-side key portion (163) will be explained again later together with the main frame (130) and the pivot scroll (150).

[0111] The effects of the scroll compressor (1) according to the above embodiment are as follows.

[0112] That is, when power is applied to the drive motor (120) and rotational force is generated, the pivoting scroll (150), which is eccentrically coupled to the rotation shaft (125), pivots relative to the fixed scroll (140) by the Oldham ring (160). At this time, two pairs of compression chambers (V) that move continuously are formed between the fixed scroll (140) and the pivoting scroll (150).

[0113] Then, the compression chamber (V) gradually narrows in volume as it moves from the intake port (or intake chamber) toward the discharge port (or discharge chamber) (1412) while the rotating scroll (150) is rotating.

[0114] Then, the refrigerant flows into the compression chamber (V) through the refrigerant suction pipe (115) and the suction port of the fixed scroll (140), and the refrigerant is compressed while moving toward the final compression chamber by the rotating scroll (150). The refrigerant is discharged from the final compression chamber to the upper space (110b) of the casing (110) through the discharge port (1412) of the fixed scroll (140), and then moves to the middle space (110c) and / or lower space (110d) of the casing (110) through the refrigerant guide passage provided in the fixed scroll (140) and the main frame (130).

[0115] Then, the refrigerant circulates through the internal space (110a) of the casing (110), and the oil separated from the refrigerant is moved to a storage space forming the lower space (110d) of the casing (110) and stored thereafter, and then supplied to the compression section through the oil pickup (126) and the oil supply hole (1255) of the rotating shaft (125), while the refrigerant from which the oil has been separated is discharged to the outside of the casing (110) through the refrigerant discharge pipe (116), repeating a series of processes.

[0116] At this time, when the swivel scroll (150) rotates, the Oldham ring (160) receives a reaction force in the opposite direction of the rotation due to the rotational force of the swivel scroll (150). As the swivel scroll (150) rotates counterclockwise, the Oldham ring (160) receives a reaction force in the clockwise direction (tangential direction). Wear of the Oldham ring (160) and the swivel scroll (150) mainly occurs at the end of the key (163).

[0117] In the frame-side key receiving portion (1331) of the main frame (130), the frame-side key portion (162) of the Oldham ring (160) is slidably inserted, and in the pivot-side key receiving portion (1511) of the pivot scroll (150), the pivot-side key portion (163) of the Oldham ring (160) is slidably inserted, thereby suppressing the rotation of the pivot scroll (150). Accordingly, a contact force (hereinafter collectively referred to as surface pressure) is generated on the circumferential side of the frame-side key receiving portion (1331) and on both circumferential sides of the frame-side key portion (162) facing it, and on the circumferential side of the pivot-side key receiving portion (1511) and on both circumferential sides of the pivot-side key portion (163) facing it. This surface pressure corresponds to the value obtained by dividing the force acting on the key portion (162)(163) of the Oldham ring (160) by the circumferential contact area (hereinafter referred to as the key area) of the key portion (162)(163) of the Oldham ring (160) with the pivot side key receiving portion (1511) of the pivot scroll (150) or the frame side key receiving portion (1331) of the main frame (130), and the amount of wear on the key portion (162)(163) of the Oldham ring (160) can be determined according to the surface pressure. In other words, if the surface pressure is high, the amount of wear on the Oldham ring (160) (e.g., the amount of wear on the key portion) increases, and if the surface pressure is low, the amount of wear on the Oldham ring (160) decreases.

[0118] Wear of the Oldham ring (160) mostly occurs at the ends of the key portions (162) (163) of the Oldham ring (160), because the rotational force of the rotating scroll (150) is transmitted to the key portions (162) (163) of the Oldham ring (160), and the Oldham ring (160) key ends, the rotating scroll (150), and the main frame (130) make line contact rather than surface contact. This causes wear of the Oldham ring (160), and if the wear of the Oldham ring (160) occurs excessively, the rotating scroll (150) rotates, causing wear of the rotating scroll (150) wrap and the fixed scroll (140) wrap, which causes compressor failure.

[0119] It is necessary to induce deformation of the key portions (162)(163) of the Oldham ring (160) when an excessive load is applied to the key portions (162)(163) of the Oldham ring (160) to prevent friction or wear occurring at the ends of the key portions (162)(163) of the Oldham ring (160) and further reduce noise. In particular, since the rotational force of the swivel scroll (150) is transmitted to the key portions (162)(163) of the Oldham ring (160), and the key portions of the Oldham ring (160), the swivel scroll (150), and the main frame (130) are in surface contact rather than line contact, it may be advantageous to reduce wear of the Oldham ring (160) occurring at the ends of the key portions (162)(163) of the Oldham ring (160).

[0120] When the rotating scroll (150) rotates, the Oldham ring (160) receives a reaction force in the opposite direction of the rotation due to the rotational force of the rotating scroll (150). As the rotating scroll (150) rotates counterclockwise, the Oldham ring (160) receives a reaction force in the clockwise direction (tangential direction). Wear of the Oldham ring (160) and the rotating scroll (150) mainly occurs at the end of the key.

[0121] In the present invention, a recess (1621, 1631) is formed in the key portion (162)(163) of the Oldham ring (160). As the recess (1621, 1631) is provided in the key portion (162)(163) of the Oldham ring (160), the key portion (162)(163) of the Oldham ring (160) can be deformed by the key receiving portion (1331, 1511) of the pivot scroll (150) or main frame (130) and can come into surface contact with the key receiving portion (1331, 1511).

[0122] As a result, when the key (162)(163) of the Oldham ring (160) is subjected to an excessive load, the deformation of the key (162)(163) of the Oldham ring (160) is induced, thereby preventing friction and wear occurring at the ends of the key (162)(163) of the Oldham ring (160) and reducing noise.

[0123] FIG. 4 is a longitudinal section view illustrating the pivot scroll (150) and Oldham ring (160) of the present invention. FIG. 5 is a perspective view illustrating the Oldham ring (160) of the present invention.

[0124] Hereinafter, the scroll compressor (1) of the present invention will be described with reference to FIGS. 1 to 5.

[0125] The scroll compressor (1) of the present invention comprises: a casing (110); a main frame (130) provided inside the casing (110); a rotating shaft (125) supported by the main frame (130); a pivoting scroll (150) coupled to the rotating shaft (125) and supported by the main frame (130); a fixed scroll (140) fixed to the main frame (130) and engaged with the pivoting scroll (150) to form a compression chamber; and an Oldham ring (160) slidably coupled to the pivoting scroll (150) to prevent rotation of the pivoting scroll (150).

[0126] In the present invention, the Oldham ring (160) includes a ring body (161) and a key (162) (163).

[0127] The ring body (161) is formed in an annular shape and is provided between the main frame (130) and the pivot scroll (150) and is supported in the axial direction of the rotation axis (125).

[0128] The key (162)(163) extends axially from the ring body (161) and is slidably inserted into a key receiving portion provided in the pivot scroll (150), the main frame (130), or the fixed scroll (140).

[0129] A concave portion (1621, 1631) is provided at the end portion in the radial direction of the key (162)(163), and the concave portion (1621, 1631) is arranged so as not to extend beyond the ring body (161) in the radial direction.

[0130] For example, the concave portion (1621, 1631) may be formed in a structure that is placed on one surface of the ring body (161) rather than being a structure that protrudes further radially from the ring body (161).

[0131] That is, the key portion (162)(163) of the present invention can be understood as forming a “non-protruding Oldham ring (160) key structure” in which the concave portion (1621, 1631) is not a structure in which it protrudes further radially from the ring body (161).

[0132] As illustrated in FIGS. 1 and 2, in the present invention, the Oldham ring (160) is provided between the pivot scroll (150) and the main frame (130) to prevent rotation of the pivot scroll (150).

[0133] For example, in the case of the prior art, a structure is disclosed in which the key of the Oldham ring (160) is coupled to a rotating scroll (150) and a fixed scroll (140). In this case, the key of the Oldham ring (160) may have a shape protruding radially from the ring body (161).

[0134] The key portion (162)(163) of the Oldham ring (160) of the present invention is not structured to protrude further in the radial direction from the ring body (161) of the prior art Oldham ring (160) key, but forms a structure that is placed on one side of the ring body (161), thereby forming a structure that is smaller in the radial direction, so more wear may occur.

[0135] In the present invention, by forming a concave portion (1621, 1631) in the key portion (162)(163) of the Oldham ring (160), the deformation of the key portion (162)(163) of the Oldham ring (160) is induced when the key portion (162)(163) of the Oldham ring (160) is subjected to an excessive load, thereby preventing friction and wear occurring at the end of the key portion (162)(163) of the Oldham ring (160) and reducing noise.

[0136] In addition, the present invention has the advantage of securing a radial design space for the scroll compressor (1) by forming a structure in which the Oldham ring (160) key part (162) (163) is coupled to the key receiving part (1331, 1511) of the pivot scroll (150) or main frame (130).

[0137] For example, the concave portion (1621, 1631) can be understood as a trepan structure.

[0138] Referring to FIG. 3, when the rotating scroll (150) rotates, the Oldham ring (160) receives a reaction force in the opposite direction of the rotation due to the rotational force of the rotating scroll (150). An example is illustrated in which the rotating scroll (150) rotates counterclockwise and the Oldham ring (160) receives a reaction force in the clockwise direction. Additionally, the Oldham ring (160) receives a reaction force from the rotating scroll (150) in the tangential direction.

[0139] FIG. 6 is a conceptual diagram illustrating the direction of wear on the key portion (162)(163) of the Oldham ring (160), and FIG. 7 is a graph illustrating the amount of wear along the direction of wear in FIG. 6. Additionally, FIG. 8 is a conceptual diagram illustrating an example of line contact between the key portion (162)(163) and the key receiving portion (1331, 1511) of a conventional Oldham ring (160), and FIG. 9 is a conceptual diagram illustrating an example of surface contact between the key portion (162)(163) of the Oldham ring (160) of the present invention as it is deformed by the key receiving portion (1331, 1511). Meanwhile, FIG. 10 is a graph illustrating the amount of wear when line contact and surface contact occur along the direction of wear.

[0140] In addition, FIG. 6 shows a graph illustrating an example in which the amount of wear increases in the end direction of the Oldham ring (160), that is, in the wear direction, and the amount of wear becomes maximum near the end of the Oldham ring (160).

[0141] Referring to the graph in Fig. 7, the direction of wear in the direction of the arrow is shown, and an example is shown in which maximum wear (3.56) occurs at the end side (position 57.5) of the Oldham ring (160) along the direction of wear.

[0142] Accordingly, wear of the Oldham ring (160) and the slewing scroll (150) mainly occurs at the ends of the key portions (162) (163), as shown in FIGS. 6 and 7. To prevent this, with reference to FIGS. 8 and 9, the key portions (162) (163) of the Oldham ring (160) are provided with concave portions (1621, 1631), thereby inducing deformation of the key portions (162) (163) of the Oldham ring (160) so that line contact can become surface contact.

[0143] In FIG. 9, an example in which surface contact is induced by the concave portions (1621, 1631) of the key (162) (163) is conceptually illustrated and can be verified.

[0144] Referring to the graph in FIG. 10, the direction of wear in the direction of the arrow is shown. Along the direction of wear, at the end side (position 57.5) of the Oldham ring (160), maximum wear (3.56) occurs upon line contact, and an example is shown in which the maximum wear (3.55) is reduced by forming a concave portion (1621, 1631) to make surface contact.

[0145] Again, with reference to FIGS. 2 to 5, the structure of the Oldham ring (160) of the present invention will be described.

[0146] The Oldham ring (160) includes a ring body (161) and a key (162) (163).

[0147] The ring body (161) is provided between the main frame (130) and the pivot scroll (150) and is supported in the axial direction of the rotation axis (125).

[0148] Additionally, the ring body (161) is formed in an annular shape. Key portions (162) and (163) are formed extending axially on the ring body (161).

[0149] FIG. 2 illustrates an example in which key parts (162) and (163) are formed on the ring body (161) to extend toward the pivot scroll (150) and the main frame (130), respectively.

[0150] Two key parts (163) are provided in the direction toward the rotating scroll (150), and two key parts (162) are also provided in the direction toward the main frame (130).

[0151] In the conventional structure, the structure in which the Oldham ring (160) is placed between the rotating scroll (150) and the fixed scroll (140) has a shape in which the key (162) (163) protrudes outward from the ring body (161) when viewed from a radial perspective, which makes it difficult to secure design space.

[0152] The present invention, for example, can be structured such that an Oldham ring (160) is positioned between a rotating scroll (150) and a main frame (130), and the key portion (162) (163) of the Oldham ring (160), particularly the concave portion (1621, 1631), is positioned so as not to deviate from the ring body (161) in the radial direction, thereby being advantageous for securing design space in the radial direction of the rotating scroll (150).

[0153] The key (162)(163) extends axially from the ring body (161).

[0154] The key (162)(163) can be formed in a polygonal shape.

[0155] In addition, the key (162)(163) has a concave portion (1621, 1631) formed at the outer end in the present invention, and the concave portion (1621, 1631) is arranged so as not to deviate from the ring body (161) in the radial direction.

[0156] The concave portion (1621, 1631) may be provided at the outer end in the radial direction.

[0157] As shown in FIG. 2, the key (162)(163) is approximately rectangular in shape, and an example is shown in which the outer end is formed concavely in a semicircle.

[0158] However, it is not necessarily limited to this, and as described below, a concave portion (1621, 1631) may be formed not only on the outer end of the key (162) (163) but also on the inner end.

[0159] In addition, the concave portion (1621, 1631) may be formed concavely in the shape of a polygon rather than a semicircle.

[0160] Other embodiments of the concave portion (1621, 1631) will be described later.

[0161] The ring body (161) may be equipped with a key support.

[0162] The key support portion is provided with the key portion (162)(163) of the Oldham ring (160), and is configured to support the key portion (162)(163) of the Oldham ring (160).

[0163] That is, the key support part can be understood as a part where the key part (162)(163) is formed and supported, or as an area where the key part (162)(163) is connected.

[0164] The key support may be provided with a concave support (1611).

[0165] The concave support portion (1611) is formed to protrude radially from the ring body (161) and can support one side of the concave portion (1621, 1631).

[0166] The concave support portion (1611) can support the concave portion (1621, 1631) so that it is not damaged when the concave portion (1621, 1631) is deformed by being pressed by the pivot scroll (150) or the key receiving portion (1331, 1511) of the main frame (130).

[0167] The concave support portion (1611) may be a portion formed to protrude radially from the ring body (161) to support the key portion (162) (163). In particular, it may be provided in the ring body (161) to prevent damage to the concave portions (1621, 1631).

[0168] The key support may further include a lateral support (1613).

[0169] The lateral support portion (1613) can be extended to be rounded laterally so as to support the deformation of the concave portion (1621, 1631) laterally.

[0170] The key portion (162)(163) of the Oldham ring (160) does not protrude radially to the outside of the concave support portion (1611) and may not protrude further laterally to the outside of the lateral support portion (1613).

[0171] As a result, the key portion (162)(163) of the Oldham ring (160) can be stably supported by the key support portion (1611, 1613) when deformation is induced by being pressed by the key receiving portion (1331, 1511) of the pivot scroll (150) or the main frame (130).

[0172] In addition, surface contact with the key receiving portion (1331, 1511) of the rotating scroll (150) is made, thereby inducing deformation and reducing wear.

[0173] In the present invention, the concave portion (1621, 1631) may be formed in a semicircular shape or in a polygonal shape.

[0174] Referring to FIGS. 3 to 5, a semicircular concave portion (1621, 1631) is described.

[0175] The concave portion (1621, 1631) may include a deformation end portion (1621a, 1631a) and a deformation support portion (1621b, 1631b).

[0176] The deformed end (1621a, 1631a) can be deformed by being pressed by contact with the pivot scroll (150) or the key receiving part (1331, 1511) of the main frame (130).

[0177] The deformed ends (1621a, 1631a) may be provided on both sides of the key portion (162)(163). Additionally, the deformed ends (1621a, 1631a) may define both sides of the concave portion (1621, 1631).

[0178] The deformed end (1621a, 1631a) can be formed as a curved surface.

[0179] Due to this structure of the deformation end (1621a, 1631a), when the pivot scroll (150) pivots, the key portion (162) (163) of the Oldham ring (160) can make surface contact with the key receiving portion (1331, 1511) of the pivot scroll (150), thereby inducing deformation and reducing wear.

[0180] The deformation support members (1621b, 1631b) are connected to and support the deformation end members (1621a, 1631a) to enable deformation. The deformation support members (1621b, 1631b) are provided between the deformation end members (1621a, 1631a) on both sides and are provided concavely in the shape of a semicircle to support the deformation end members (1621a, 1631a) from the inside, thereby enabling deformation of the deformation end members (1621a, 1631a).

[0181] When the pivoting scroll (150) pivots, the deformed end portions (1621a, 1631a) of the key portions (162) (163) of the Oldham ring (160) are deformed while in surface contact with the key receiving portions (1331, 1511) of the pivoting scroll (150). The deformed support portions (1621b, 1631b) support the deformed end portions (1621a, 1631a) from the inside, thereby inducing deformation of the deformed end portions (1621a, 1631a) and reducing wear.

[0182] As described above, in FIGS. 6 and 7, wear can be observed in the key portion (162)(163) of the Oldham ring (160) of the prior art. The end portion of the key portion (162)(163) of the prior art Oldham ring (160) has a structure that is difficult to deform because it is not equipped with a concave portion (1621, 1631). Therefore, the key portion (162)(163) of the prior art Oldham ring (160) comes into line contact with the key receiving portion (1331, 1511) of the pivot scroll (150) or main frame (130), and the amount of wear increases toward the end portion.

[0183] When the rotating scroll (150) rotates, the Oldham ring (160) receives a reaction force in the opposite direction to the rotational direction due to the rotational force. More specifically, the reaction force of the Oldham ring (160) can be applied at the ends of the key (162)(163) in the tangential direction of the ring body (161).

[0184] The rotational force of the rotating scroll (150) is generated at the end of the rotating plate portion of the rotating scroll (150), and the reaction force of the Oldham ring (160) key portion (162)(163) to this acts on the end of the Oldham ring (160) key portion (162)(163).

[0185] As a result, wear of the Oldham ring (160) and the rotating scroll (150) mainly occurs at the ends, and to prevent this, the key portion (162) (163) of the Oldham ring (160) is provided with a concave portion (1621, 1631), so that the key portion (162) (163) is deformed by receiving a reaction force from the key receiving portion (1331, 1511), thereby allowing the line contact to become surface contact.

[0186] FIG. 11 is a perspective view illustrating an example in which a concave portion is formed at the inner end of a key portion, and FIG. 12 is a perspective view illustrating another embodiment of the concave portion of the present invention. FIG. 13 is a perspective view illustrating an example in which the concave portion of the present invention is formed penetrating a ring body. In addition, FIG. 14 is a conceptual diagram illustrating the width of the polygonal protrusions (1621e, 1631e) of the concave portion and the depth in which the polygonal support portions (1621f, 1631f) are formed.

[0187] Referring to FIGS. 12 to 14, polygonal concave portions (1621, 1631) will be described.

[0188] In FIG. 12, a polygonal concave portion (1621, 1631) is shown.

[0189] The concave portion (1621, 1631) can be formed by two intersecting faces, thus forming a polygon.

[0190] The concave portion (1621, 1631) may include polygonal protrusions (1621e, 1631e) and polygonal support portions (1621f, 1631f).

[0191] The polygonal protrusions (1621e, 1631e) are provided on both sides of the key (162)(163) and can be formed to protrude in a polygonal structure.

[0192] For example, the polygonal protrusions (1621e, 1631e) can be implemented as part of a rectangular shape with an inner angle of about 90 degrees.

[0193] The polygonal protrusions (1621e, 1631e) can be deformed by being pressed by contact with the pivot scroll (150) or the key receiving portion (1331, 1511) of the main frame (130).

[0194] The polygonal protrusions (1621e, 1631e) may have a predetermined thickness in a direction intersecting the radial direction.

[0195] Due to this structure of the polygonal protrusions (1621e, 1631e), when the rotary scroll (150) is rotated, the key portions (162) (163) of the Oldham ring (160) can come into surface contact with the key receiving portions (1331, 1511) of the rotary scroll (150), thereby inducing deformation and reducing wear.

[0196] Additionally, polygonal protrusions (1621e, 1631e) may be provided on both sides of the key portion (162)(163). The polygonal protrusions (1621e, 1631e) may define both ends of the concave portion (1621, 1631).

[0197] The polygonal support member (1621f, 1631f) is provided between the polygonal protrusions (1621e, 1631e) and can be formed concavely in a polygonal structure to support the polygonal protrusions (1621e, 1631e) in a deformable manner.

[0198] The polygonal support members (1621f, 1631f) are connected to and support the polygonal protrusions (1621e, 1631e) to enable deformation. The polygonal support members (1621f, 1631f) are provided between the polygonal protrusions (1621e, 1631e) on both sides and are provided concavely in a polygonal shape to support the polygonal protrusions (1621e, 1631e) from the inside, thereby enabling deformation of the polygonal protrusions (1621e, 1631e).

[0199] When the pivoting scroll (150) pivots, the deformed end portions (1621a, 1631a) of the key portions (162) (163) of the Oldham ring (160) are deformed while in surface contact with the key receiving portions (1331, 1511) of the pivoting scroll (150). The polygonal support portions (1621f, 1631f) support the polygonal protrusion portions (1621e, 1631e) from the inside, thereby inducing deformation of the polygonal protrusion portions (1621e, 1631e) and reducing wear.

[0200] The polygonal support (1621f, 1631f) may have a predetermined depth in the radial direction.

[0201] Meanwhile, if the thickness of the polygonal protrusions (1621e, 1631e) is thinner than a certain thickness and the radial depth of the polygonal support parts (1621f, 1631f) is deeper than a certain thickness, the deformation caused by the load increases, so problems such as the key part (162)(163) breaking may occur, and reliability may be reduced.

[0202] Conversely, if the thickness of the polygonal protrusions (1621e, 1631e) is thicker than a certain thickness and the radial depth of the polygonal support (1621f, 1631f) is shallower than a certain thickness, it becomes difficult for the polygonal protrusions (1621e, 1631e) to deform, and thus the effect caused by the concave portions (1621, 1631) is reduced.

[0203] Therefore, the polygonal protrusions (1621e, 1631e) and polygonal support parts (1621f, 1631f) can satisfy [Equation 1].

[0204] [Mathematical Formula 1]

[0205] H t / {(t m1 +t m2 ) / 2} > 1

[0206] Here, H t is the radial depth of the polygonal support (1621f, 1631f), t m1The thickness, t, in the direction intersecting the radial direction of the polygonal protrusion (1621e, 1631e) on one side. m2 is the thickness in the direction intersecting the radial direction of the polygonal protrusion (1621e, 1631e) on the other side.

[0207] The thickness of one side of the polygonal protrusion (1621e, 1631e) and the thickness of the other side of the polygonal protrusion (1621e, 1631e) may be the same or different.

[0208] In the case where the thickness of one side of the polygonal protrusion (1621e, 1631e) and the thickness of the other side of the polygonal protrusion (1621e, 1631e) are the same, the above [Equation 1] can be understood as a condition in which the radial depth of the polygonal support (1621f, 1631f) is greater than the thickness of one side or the other side of the polygonal protrusion (1621e, 1631e).

[0209] In cases where the thickness of one side of the polygonal protrusion (1621e, 1631e) and the thickness of the other side of the polygonal protrusion (1621e, 1631e) are different, the above [Equation 1] can be understood as a condition in which the radial depth of the polygonal support (1621f, 1631f) is greater than the average of the thicknesses of one side and the other side of the polygonal protrusion (1621e, 1631e).

[0210] Referring to FIG. 11 and FIG. 13, the concave portion (1621, 1631) may be further provided at the inner end in the radial direction of the key portion (162)(163). The concave portion (1621, 1631) at the inner end of the key portion (162)(163) may be positioned so as not to extend inward toward the ring body (161).

[0211] As a result, even at the inner end of the key (162)(163), the key (162)(163) is deformed by the key receiving portion (1331, 1511), thereby preventing friction or wear occurring on the inner side of the Oldham ring (160) key (162)(163) and reducing noise.

[0212] The concave support portion (1611) may further include a concave support groove portion (1611a).

[0213] The concave support groove (1611a) is provided in a shape that matches the concave portion (1621, 1631), and can be arranged parallel to the concave portion (1621, 1631) in the axial direction.

[0214] As the concave support groove (1611a) and the concave portions (1621, 1631) are arranged side by side, the key portions (162) (163) of the Oldham ring (160) and the ring body (161) of the Oldham ring (160) can form a structure in which the ends are penetrated in the axial direction.

[0215] Additionally, when the concave portion (1621, 1631) is deformed by the key receiving portion (1331, 1511) by the concave support groove portion (1611a), the concave support groove portion (1611a) can also be deformed together with the concave portion (1621, 1631). As a result, friction and wear occurring at the ends of the key portions (162) (163) of the Oldham ring (160) can be further prevented.

[0216] The scroll compressor (1) of the present invention comprises: a plurality of scrolls including a pivot scroll (150) that interlocks with each other and in which at least one of the scrolls is coupled to a rotation axis (125) to perform a pivoting motion; and an Oldham ring (160) that is slidably coupled to the pivot scroll (150) to prevent rotation of the pivot scroll (150).

[0217] The Oldham ring (160) comprises: a ring body (161) that is formed in an annular shape and supported in an axial direction and slidably coupled to the pivot scroll (150); and a key part (162) (163) that extends axially from the ring body (161) and is slidably inserted into a key receiving part (1331, 1511) provided in the pivot scroll (150).

[0218] A concave portion (1621, 1631) is provided on the outer side of the key portion (162)(163), and the concave portion (1621, 1631) can be arranged so as not to extend beyond the ring body (161) in the radial direction.

[0219] As a result, the key portion (162)(163) of the Oldham ring (160) can be stably supported by the key support portion (1331, 1511) of the key receiving portion (1331, 1511) of the pivot scroll (150) or main frame (130) when deformation is induced by being pressed by the key receiving portion (1331, 1511).

[0220] The key portion (162)(163) of the Oldham ring (160) of the present invention is not structured to protrude further in the radial direction from the ring body (161) of the prior art Oldham ring (160) key, but forms a structure that is placed on one side of the ring body (161), thereby forming a structure that is smaller in the radial direction, so more wear may occur.

[0221] In the present invention, by forming a concave portion (1621, 1631) in the key portion (162)(163) of the Oldham ring (160), the deformation of the key portion (162)(163) of the Oldham ring (160) is induced when the key portion (162)(163) of the Oldham ring (160) is subjected to an excessive load, thereby preventing friction and wear occurring at the end of the key portion (162)(163) of the Oldham ring (160) and reducing noise.

[0222] In addition, the present invention has the advantage of securing a radial design space for the scroll compressor (1) by forming a structure in which the Oldham ring (160) key part (162) (163) is coupled to the key receiving part (1331, 1511) of the pivot scroll (150) or main frame (130).

[0223] For example, the concave portion (1621, 1631) can be understood as a trepan structure.

[0224] The scroll compressor (1) of the present invention may further include the aforementioned components, such as a casing (110), a main frame (130), and a rotating shaft (125), and each component has already been described above.

[0225] The scroll compressor (1) described above is not limited to the configuration and method of the embodiments described above, and all or part of each embodiment may be selectively combined to allow for various modifications to be made.

[0226] It is obvious to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit and essential features of the invention. Accordingly, the foregoing detailed description should not be interpreted restrictively in all respects but should be considered exemplary. The scope of the invention shall be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the invention are included within the scope of the invention.

[0227] The present invention can be applied to a scroll compressor.

Claims

1. Casing; A main frame provided inside the above casing; A rotating shaft supported by the main frame above; A pivot scroll coupled to the above-mentioned rotation axis and supported by the above-mentioned main frame; A fixed scroll fixed to the main frame and engaged with the pivoting scroll to form a compression chamber; and It includes an Oldham ring that is slidably coupled to the above-mentioned rotating scroll to prevent rotation of the above-mentioned rotating scroll, and The above Oldham ring is, A ring body formed in an annular shape and provided between the main frame and the pivot scroll and supported in the axial direction of the rotation axis; and It includes a key portion that extends axially from the ring body and slides into a key receiving portion provided in the pivot scroll or the main frame. A scroll compressor having a recess provided on the outer side of the key portion, wherein the recess is arranged so as not to extend beyond the ring body in the radial direction.

2. In Paragraph 1, The above ring body is a scroll compressor having a concave support portion that protrudes radially to support the concave portion from one side.

3. In Paragraph 1, The above-mentioned concave portion is a scroll compressor formed to be concave in the shape of a semicircle.

4. In Paragraph 3, The above-mentioned concave portion is, Deformable ends provided on both sides of the key portion and deformed by being pressed by contact with the pivot scroll or the key receiving portion of the main frame; and A scroll compressor comprising a deformation support member provided between two deformation ends and configured in a semicircular shape to support the deformation ends from the inside and induce deformation of the deformation ends.

5. In Paragraph 4, The above deformation end is a scroll compressor formed as a curved surface.

6. In Paragraph 1, The above-mentioned concave portion is a scroll compressor formed by at least two intersecting faces.

7. In Paragraph 6, The above-mentioned concave portion is, Polygonal protrusions provided on both sides of the key and formed to protrude in a polygonal structure; and A scroll compressor comprising a polygonal support member provided between the polygonal protrusions and formed concavely in a polygonal structure to support the polygonal protrusions so as to allow for deformation.

8. In Paragraph 7, The above polygonal protrusion has a predetermined thickness in a direction intersecting the radial direction, The above-mentioned polygonal support member has a predetermined depth in the radial direction, and The above polygonal protrusion and the above polygonal support are a scroll compressor satisfying [Equation 1]. [Mathematical Formula 1] H t / {(t m1 +t m2 ) / 2} > 1 Here, H t is the radial depth of the polygonal support, t m1 is the thickness in the direction intersecting the radial direction of the polygonal protrusion on one side, t m2 is the thickness in the direction intersecting the radial direction of the polygonal protrusion on the other side.

9. In Paragraph 2, A scroll compressor having a lateral support member that extends laterally to be rounded so as to support the deformation of the concave member from the lateral direction.

10. In Paragraph 9, A scroll compressor in which the key portion of the above Oldham ring does not protrude radially to the outside of the concave support portion and does not protrude further laterally to the outside of the lateral support portion.

11. In Paragraph 1, The above-mentioned concave portion is formed to be radially concave at the outer end of the key portion and is positioned inwardly from the outer circumference of the ring body.

12. In Paragraph 1, A scroll compressor in which the above-mentioned concave portion is further provided at the inner end in the radial direction of the key portion, and the concave portion at the inner end of the key portion is positioned so as not to deviate into the inner side of the ring body.

13. In Paragraph 2, A scroll compressor having the above-mentioned concave support member provided with a shape that matches the above-mentioned concave member, and further having a concave support groove member arranged parallel to the above-mentioned concave member in the axial direction.

14. A plurality of scrolls including a rotary scroll that interlocks with each other and in which at least one scroll is coupled to a rotation axis to perform a rotary motion; and It includes an Oldham ring that is slidably coupled to the above-mentioned rotating scroll to prevent rotation of the above-mentioned rotating scroll, and The above Oldham ring is, A ring body formed in an annular shape and supported in the axial direction, which is slidably coupled to the rotary scroll; and It includes a key portion that extends axially from the ring body and slides into a key receiving portion provided in the pivot scroll, A scroll compressor having a recess provided on the outer side of the key portion, wherein the recess is arranged so as not to extend beyond the ring body in the radial direction.

15. In Paragraph 14, The above-mentioned concave portion is a scroll compressor formed to be concave in the shape of a semicircle.

16. In Paragraph 15, The above-mentioned concave portion is, Deformable ends provided on both sides of the key portion and deformed by being pressed upon contact with the key receiving portion of the pivot scroll; and A scroll compressor comprising a deformation support member provided between two deformation ends and configured in a semicircular shape to support the deformation ends from the inside and induce deformation of the deformation ends.

17. In Paragraph 14, The above-mentioned concave portion is a scroll compressor formed by at least two intersecting faces.

18. In Paragraph 17, The above-mentioned concave portion is, Polygonal protrusions provided on both sides of the key and formed to protrude in a polygonal structure; and A scroll compressor comprising a polygonal support member provided between the polygonal protrusions and formed concavely in a polygonal structure to support the polygonal protrusions so as to allow for deformation.

19. In Paragraph 18, The above polygonal protrusion has a predetermined thickness in a direction intersecting the radial direction, The above-mentioned polygonal support member has a predetermined depth in the radial direction, and The above polygonal protrusion and the above polygonal support are a scroll compressor satisfying [Equation 1]. [Mathematical Formula 1] H t / {(t m1 +t m2 ) / 2} > 1 Here, H t is the radial depth of the polygonal support, t m1 is the thickness in the direction intersecting the radial direction of the polygonal protrusion on one side, t m2 is the thickness in the direction intersecting the radial direction of the polygonal protrusion on the other side.

20. In Paragraph 14, The above-mentioned concave portion is formed to penetrate the ring body in the axial direction. A scroll compressor.

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