Scroll compressor
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- LG ELECTRONICS INC
- Filing Date
- 2025-05-09
- Publication Date
- 2026-07-30
Smart Images
Figure KR2025006305_30072026_PF_FP_ABST
Abstract
Description
Scroll compressor
[0001] The present invention relates to a scroll compressor.
[0002] A scroll compressor is a compressor that forms a compression chamber in which one or two scrolls facing each other move continuously while rotating. The scroll compressor may be equipped with a self-prevention member that prevents a scroll (e.g., a rotating scroll) receiving rotational force from a drive motor from rotating relative to another scroll (e.g., a stationary scroll) or a stationary frame.
[0003] Oldham rings and pin and ring are commonly known as anti-rotation components. Oldham rings offer advantages over pin and ring 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.
[0004] Patent Document 1 (Korean Registered Patent No. 10-0235857) discloses a technology for reducing the weight of an Oldham ring by forming a groove on the inner or outer surface of a ring body. Patent Document 2 (U.S. Published Patent 2017 / 0234313 A1) discloses a technology for reducing the weight of an Oldham ring by forming the ring body and the key from different heterogeneous materials.
[0005] However, while Patent Document 1 can achieve lightweighting by reducing the weight of the Oldham ring, it fails to sufficiently secure the rigidity of the Oldham ring, which may lead to reduced reliability. For example, although the key engaging the Oldham ring with the frame (or fixed scroll) and the key engaging the slewing scroll receive different loads, Patent Document 1 does not take this into account and forms a groove in the middle of the outer circumference or the middle of the inner circumference of the ring body. Consequently, if the groove is formed large to account for the weight of the Oldham ring, it is advantageous for reducing the weight of the Oldham ring, but reliability may be reduced as the ring body deforms significantly around the key engaging the slewing scroll. If the groove is formed as small as possible to account for this, the weight of the Oldham ring cannot be reduced to that extent, which may limit the lightweighting of the Oldham ring.
[0006] The same applies to Patent Document 2. In Patent Document 2 as well, the keys engaged with the frame (or fixed scroll) and the keys engaged with the slewing scroll are formed from the same material without considering the characteristic that they receive different loads. As a result, as in Patent Document 1, deformation may occur in the keys depending on the material, which may reduce the reliability of the Oldham ring or limit the reduction of the weight of the keys.
[0007] The objective of the present invention is to provide a scroll compressor capable of increasing motor efficiency by reducing the weight of the Oldham ring.
[0008] Another objective of the present invention is to provide a scroll compressor that can ensure reliability by reducing the weight of the ring body while suppressing deformation of the ring body.
[0009] Another objective of the present invention is to provide a scroll compressor that can be easily manufactured while reducing the weight of the ring body and suppressing deformation.
[0010] To achieve the objective of the present invention, a scroll compressor comprising a casing, a frame, a first scroll, a second scroll, and an Oldham ring may be provided. The frame may be fixed to the casing. The first scroll may be supported by the frame. The second scroll may be provided between the frame and the first scroll and may pivot relative to the frame and the first scroll. The Oldham ring may comprise a ring body, a first key that slides into a first keyway provided in the frame or the first scroll, and a second key that slides into a second keyway provided in the second scroll. A weight-reduced portion may be formed by being recessed into the ring body of the Oldham ring, on the side facing away from the second scroll among the axial sides of the ring body.
[0011] For example, the above-mentioned weight loss portions may be formed between the first key and the second key, which are adjacent to each other along the circumferential direction of the ring body.
[0012] For example, the above-mentioned weight loss portions may be formed one by one between the first key and the second key that are adjacent to each other along the circumferential direction of the ring body.
[0013] In addition, the above-mentioned weight loss portions may be formed in multiple numbers between the first key and the second key that are adjacent to each other along the circumferential direction of the ring body.
[0014] In addition, the cross-sectional area of the above-mentioned weight loss portion may be formed to be smaller than the cross-sectional area of the ring body excluding the weight loss portion at the location where the weight loss portion is formed.
[0015] Specifically, the cross-sectional area of the above-mentioned weight loss portion may be formed to be approximately greater than or equal to 1 / 10 and less than or equal to 1 / 2 relative to the cross-sectional area of the above-mentioned ring body.
[0016] Additionally, the weight loss portion may include an inner surface, an outer surface spaced apart from the inner surface by a predetermined distance, and a connecting surface connecting the inner surface and the outer surface. The inner surface and the outer surface may be formed to be inclined or orthogonal to the connecting surface.
[0017] For example, the height of each of the inner surface and the outer surface may be formed to be greater than or equal to 0.3 times the height of the ring body and less than or equal to 0.6 times.
[0018] For example, the width of the above-mentioned connecting side may be formed to be greater than or equal to 0.2 times the width of the ring body and less than or equal to 0.6 times.
[0019] For example, at least one of the inner surface and the outer surface may be formed to be inclined with respect to the axial direction. The angle of inclination of the inner surface and / or the outer surface may be formed to be greater than 0° and less than or equal to 60°.
[0020] In another embodiment, the weight loss portion may be formed such that the height of the weight loss portion is uniform along the circumferential direction.
[0021] In another embodiment, the weight loss section may be formed such that the height of the second weight loss section adjacent to the second key is smaller than the height of the first weight loss section adjacent to the first key.
[0022] In another embodiment, the weight loss portion may be formed such that the width of the weight loss portion is uniform along the circumferential direction.
[0023] In another embodiment, the weight loss portion may be formed such that the width of the second weight loss portion adjacent to the second key is smaller than the width of the first weight loss portion adjacent to the first key.
[0024] In the scroll compressor according to the present invention, a weight-reduced portion may be formed by being recessed on the side facing away from the rotating scroll among the axial sides of the ring body of the Oldham ring. Through this, the weight of the Oldham ring can be reduced to increase motor efficiency, while simultaneously suppressing deformation of the ring body, thereby ensuring the reliability of the Oldham ring.
[0025] In the scroll compressor according to the present invention, the cross-sectional area of the weight-removing portion may be formed to be smaller than the cross-sectional area of the ring body excluding the weight-removing portion at the location where the weight-removing portion is formed. This allows for reducing the weight of the Oldham ring while further increasing the reliability of the Oldham ring.
[0026] In the scroll compressor according to the present invention, both sides of the weight-removing portion may be formed at an angle. This allows for easy manufacturing while reducing the weight of the ring body and suppressing deformation.
[0027] FIG. 1 is a cross-sectional view showing the interior of a scroll compressor according to the present embodiment.
[0028] FIG. 2 is a perspective view showing the compression section including the Oldham ring in a scroll compressor according to the present embodiment in disassembly.
[0029] Fig. 3 is a plan view showing the Oldham ring in Fig. 2.
[0030] FIG. 4 is a cross-sectional view along line "IV-IV" of FIG. 3.
[0031] FIG. 5 is a cross-sectional view of a ring body shown to explain the specifications of the weight loss part according to the present embodiment.
[0032] Figure 6a is a graph showing the amount of deformation of the Oldham ring according to the axial height of the weight loss section according to the radial width of the weight loss section.
[0033] Figure 6b is a graph showing the amount of deformation of the Oldham ring according to the radial width of the weight loss section according to the lateral inclination angle of the weight loss section.
[0034] FIGS. 7 and FIGS. 8 are plan views showing other embodiments of the weight loss portion of the Oldham ring.
[0035] FIG. 9 is a plan view showing another embodiment of the weight loss portion of the Oldham ring.
[0036] FIG. 10 is a perspective view showing the compression section exploded to illustrate another embodiment of the Oldham ring.
[0037] Hereinafter, a scroll compressor according to the present invention will be described in detail with reference to the attached drawings. In the following description, descriptions of some components may be omitted to clarify the features of the present invention.
[0038] In addition, as used in the following description, "upper side" refers to the direction away from the support surface supporting the scroll compressor according to an embodiment of the present invention; that is, when viewed from the perspective of the drive unit (electric unit or drive motor) and the compression unit, the drive unit (electric unit or drive motor) 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 drive unit (electric unit or drive motor) and the compression unit, the compression unit side is the lower side.
[0039] Furthermore, as used in the following description, "axial direction" refers to the longitudinal direction of the axis of rotation, and can also be understood as the up-and-down direction. "Radial direction" refers to the direction perpendicular to the axis of rotation.
[0040] In addition, the scroll compressor described below is explained using a closed-type scroll compressor as an example, in which the drive unit (electric unit or drive motor) and the compressor unit are provided within the casing. However, the same applies to an open-type compressor in which the drive unit (electric unit or drive motor) is provided outside the casing and connected to the compressor unit provided inside the casing via a rotating shaft.
[0041] In addition, the following description uses a vertical scroll compressor in which the drive unit and the compression unit are arranged in the vertical axial direction, and the compression unit is located below the drive unit (drive unit or drive motor), as an example. However, the same can be applied to a horizontal scroll compressor in which the drive unit (drive unit or drive motor) and the compression unit are arranged left and right, as well as to an upper compression scroll compressor in which the compression unit is located above the drive unit (drive unit or drive motor).
[0042] In addition, the following description uses a high-pressure scroll compressor as an example, in which the refrigerant suction pipe forming the suction passage is directly connected to the compression section and the refrigerant discharge pipe communicates with the internal space of the casing, so that the internal space of the casing forms the discharge pressure. However, the same can be applied to a low-pressure scroll compressor in which the refrigerant suction pipe communicates with the internal space of the casing.
[0043] In addition, the following description uses a scroll compressor of the swirling back pressure type, in which a back pressure chamber is formed on the back surface of the swirling scroll, as an example. However, the same can be applied to a fixed back pressure type in which a back pressure chamber is formed on the back surface of a fixed scroll (or non-swirling scroll).
[0044] FIG. 1 is a cross-sectional view showing a scroll compressor according to the present embodiment.
[0045] Referring to FIG. 1, the high-pressure, bottom-compression, and swirling back-pressure type scroll compressor according to the present embodiment (hereinafter abbreviated as scroll compressor) is provided with a drive motor (120) forming a drive unit in the upper half of the casing (110), and a main frame (130), a fixed scroll (or first scroll) (150), and a swirling scroll (or second scroll) (140) may be provided on the lower side of the drive motor (120). Typically, the drive motor (120) forms a drive unit as described above, and the main frame (130), fixed scroll (140), and swirling scroll (150) may form a compression unit (C).
[0046] The drive motor (120) forming the electric motor unit is coupled to the upper end of the rotating shaft (125) to be described later, and the compression unit (C) can be coupled to the lower end of the rotating shaft (125). Accordingly, the compressor forms a lower compression type structure as described above, and the compression unit (C) is connected to the drive motor (120) by the rotating shaft (125) and can be operated by the rotational force of the drive motor (120). Therefore, since the drive motor (120) can be understood as a drive unit that drives the compression unit (C), the drive motor (120) may be described below using the terms electric motor unit or drive unit interchangeably.
[0047] Referring to FIG. 1, the casing (110) according to the present embodiment may include a cylindrical shell (111), an upper shell (112), and a lower shell (113). The cylindrical shell (111) is cylindrical in shape with both upper and lower ends open, the upper shell (112) may be connected to cover the open upper end of the cylindrical shell (111), and the lower shell (113) may be connected to cover the open lower end of the cylindrical shell (111). Accordingly, the internal space (not shown) of the casing (110) is sealed, and the sealed internal space of the casing (110) may be separated into a lower space (S1) and an upper space (S2) based on the drive motor (120).
[0048] The lower space (S1) is a space formed on the lower side of the drive motor (120), and the lower space (S1) can be divided into a storage space (S11) and a discharge space (S12) based on the compression part (C).
[0049] The upper space (S2) is a space formed on the upper side of the drive motor (120) and forms an oil separation space in which oil is separated from the refrigerant discharged from the compression unit (C). A refrigerant discharge pipe (116), which will be described later, can be connected to the upper space (S2).
[0050] The aforementioned drive motor (120) and main frame (130) can be inserted and fixed inside the cylindrical shell (111). An oil recovery passage (not shown) can be formed on the outer surface of the drive motor (120) and the outer surface of the main frame (130), spaced apart from the inner surface of the cylindrical shell (111) by a predetermined distance.
[0051] A refrigerant suction pipe (115) can be connected by penetrating through the side of the cylindrical shell (111). Accordingly, the refrigerant suction pipe (115) can be connected by penetrating radially through the cylindrical shell (111) forming the casing (110).
[0052] The upper part of the upper shell (112) can be connected by penetrating through the inner space (not shown) of the casing (110), specifically the upper space (S2) formed above the drive motor (120), so that the inner end of the refrigerant discharge pipe (116) communicates with it.
[0053] One end of an oil circulation pipe (not shown) may be radially connected to the lower half of the lower shell (113). Both ends of the oil circulation pipe are open, and the other end of the oil circulation pipe may be connected to a refrigerant suction pipe (115). An oil circulation valve (not shown) may be installed in the middle of the oil circulation pipe.
[0054] Referring to FIG. 1, the drive motor (120) according to the present embodiment may include a stator (121) and a rotor (122). The stator (121) is inserted into and fixed to the inner circumference of a cylindrical shell (111), and the rotor (122) may be rotatably provided inside the stator (121).
[0055] The stator (121) may include a stator core (1211) and a stator coil (1212).
[0056] The stator core (1211) is formed in an annular or hollow cylindrical shape and can be fixed to the inner surface of the cylindrical shell (111) by hot press fitting.
[0057] The stator coil (1212) is wound around the stator core (1211) and can be electrically connected to an external power source through a power cable (not labeled) that is coupled through the casing (110).
[0058] The rotor (122) may include a rotor core (1221) and a permanent magnet (1222).
[0059] The rotor core (1221) can be rotatably inserted into the stator core (1211) at a predetermined gap (not indicated). The permanent magnet (1222) can be embedded inside the rotor core (1221) at a predetermined gap along the circumferential direction.
[0060] A rotating shaft (125) can be coupled to the center of the rotor core (1221). The upper end of the rotating shaft (125) is press-fitted into the rotor (122) and the lower end of the rotating shaft (125) can be rotatably inserted into the main frame (130) and supported radially. Accordingly, the rotating shaft (125) transmits the rotational force of the drive motor (120) to the rotating scroll (150) forming the compression section (C), so that the rotating scroll (150), which is eccentrically coupled to the rotating shaft (125), can perform a rotating motion relative to the fixed scroll (140).
[0061] The compression unit (C) according to the present embodiment may include a main frame (130), a fixed scroll (140), and a pivoting scroll (150). The main frame (130) is fixedly coupled to a cylindrical shell (111) at the lower side of the drive motor (120), the fixed scroll (140) is fixedly coupled to the lower side of the main frame (130), and the pivoting scroll (150) may be axially supported by the fixed scroll (140) and configured to pivot between the main frame (130) and the fixed scroll (140).
[0062] Referring to FIG. 1, the main frame (130) may include a frame plate portion (131), a frame side wall portion (132), and a main bearing portion (133).
[0063] The frame plate portion (131) is formed in the shape of a disc, and a main bearing hole (133a) forming the main bearing portion (133) to be described later can be formed by penetrating through the center in the axial direction. Accordingly, the rotation axis (125) can be rotatably coupled by penetrating the center of the frame plate portion (131).
[0064] A first keyway (131a) may be formed on one side of the frame plate section (131), that is, on the lower surface of the frame plate section (131) facing the rotating scroll (150), into which the first key (162) of the Oldham ring (160), to be described later, is inserted so as to slide. The first keyway (131a) may be formed extending in the first radial direction on each side with a phase difference of 180° along the circumferential direction. Accordingly, the first key (162), to be described later, can induce the rotational movement of the rotating scroll (150) by reciprocating in the radial direction along the first keyway (131a) while in a state of sliding contact in the circumferential direction at the first keyway (131a). The first keyway (131a) will be explained again later together with the first key (162) of the Oldham ring (160).
[0065] The frame side wall portion (132) can be extended in a cylindrical shape from the lower edge of the frame end plate portion (131) and pressed into the inner circumference of the cylindrical shell (111) by hot pressing or welded. Accordingly, the main frame (130) can be fixedly coupled to the cylindrical shell (111).
[0066] The main bearing portion (133) may be formed with a main bearing hole (133a) that penetrates axially so that the rotation shaft (125) can be rotatably inserted. A main bearing (not shown) that supports the rotation shaft (125) may be provided in the main bearing hole (133a). Accordingly, the surface portion (1252) of the rotation shaft (125) can be supported radially while rotating smoothly inside the main bearing hole (133a).
[0067] Referring to FIG. 1, the fixed scroll (140) according to the present embodiment may include a fixed end plate portion (141), a fixed side wall portion (142), a sub-bearing portion (143), and a fixed wrap (144).
[0068] The fixed end plate (141) is formed in the shape of a disc and can be positioned at a predetermined interval on the lower side of the frame end plate (131). A sub-bearing hole (143a) forming the sub-bearing part (143) to be described later can be formed through the center of the fixed end plate (141) in the vertical direction. Around the sub-bearing hole (143a), a discharge port (1411) can be formed, which is connected to the first compression chamber (V1) and the second compression chamber (V2) to be described later, respectively, and through which the compressed refrigerant is discharged into the muffler space (170a) of the discharge cover (170).
[0069] The fixed side wall portion (142) can be connected to the frame side wall portion (132) of the main frame (130) by extending in the vertical direction from the upper edge of the fixed end plate portion (141). A suction port (not shown) that penetrates the fixed side wall portion (142) in the radial direction may be formed in the fixed side wall portion (142). As previously described, the end of the refrigerant suction pipe (115) that penetrates the cylindrical shell (111) may be inserted into and connected to the suction port.
[0070] A cylindrical sub-bearing hole (143a) may be formed by penetrating axially through the center of the sub-bearing portion (143). The sub-bearing hole (143a) may be formed on the same axis as the main bearing hole (133a) provided in the main frame (130). Accordingly, the inner diameter of the sub-bearing hole (143a) may be formed to be smaller than the inner diameter of the main bearing hole (133a).
[0071] The fixed wrap (144) is formed to extend axially toward the rotating scroll (150) from the upper surface of the fixed plate section (141), and can be formed to correspond to the shape of the rotating wrap (152) to be described later. In other words, the fixed wrap (144) has a shape formed by connecting multiple arcs with different diameters and origins, and the outermost curve can be formed in a roughly elliptical shape having a major axis and a minor axis. Accordingly, the fixed wrap (144) can form a first compression chamber (V1) and a second compression chamber (V2) between it and the rotating wrap (152) to be described later, with the volume narrowing towards the center.
[0072] Referring to FIG. 1, the rotating scroll (150) may include a rotating plate portion (151), a rotating wrap (152), and a rotating shaft insertion portion (153).
[0073] The rotating plate section (151) is formed in the shape of a disc and can be accommodated between the frame plate section (131) and the fixed plate section (141). The upper surface of the rotating plate section (151) facing the main frame (130) can be supported axially with a back pressure sealing member (155) placed between it and the lower surface of the frame plate section (131). Accordingly, a back pressure chamber (Sp) can be formed between the upper surface of the rotating plate section (151) and the frame plate section (131) facing it.
[0074] On one side of the pivot plate section (151), that is, on the upper surface of the pivot plate section (151) facing the main frame (130), a second key groove (151a) into which the second key (163) of the Oldham ring (160), to be described later, is inserted to slide can be formed. The second key groove (151a) can be formed long in the second radial direction on each side with a phase difference of 180° along the circumferential direction. In other words, the second key groove (151a) can be formed long along the radial direction perpendicular to the first key groove (131a). Accordingly, the second key (163), to be described later, can induce the pivoting motion of the pivot scroll (150) by reciprocating radially along the second key groove (151a) while in a state of sliding contact in the circumferential direction at the second key groove (151a). The second keyway (151a) will be explained later along with the second key (163) of the Oldham ring (160).
[0075] The pivoting wrap (152) extends from the lower surface of the pivoting plate section (151) toward the fixed plate section (141) to be described later, and can pivot in conjunction with the fixed wrap (144). Accordingly, the pivoting wrap (152) can form the first compression chamber (V1) and the second compression chamber (V2) described above together with the fixed wrap (144).
[0076] The pivoting wrap (152) can be formed in an involute shape. However, the pivoting wrap (152) can be formed in various shapes other than involute together with the fixed wrap (144). For example, the pivoting wrap (152) may have a shape formed by connecting multiple arcs with different diameters and origins, and the outermost curve may be formed in a roughly elliptical shape having a major axis and a minor axis. The fixed wrap (144) described above may also be formed in the same way. This can be defined as a hybrid or irregular wrap shape, and in this embodiment, an example is illustrated in which the pivoting wrap (152) is formed in a hybrid shape together with the fixed wrap (144).
[0077] The rotational shaft insertion part (153) can be formed by penetrating axially from the center of the pivot plate part (151). Accordingly, the discharge port (1411) can be formed at the center of the pivot scroll (150), that is, at an eccentric position from the rotational shaft insertion part (153).
[0078] A rotating shaft (125) can be rotatably inserted and coupled into the rotating shaft insertion part (153). Accordingly, the outer surface of the rotating shaft insertion part (153) forms part of the pivoting wrap (152) and together with the inner surface of the fixed wrap (144) can form a first compression chamber (V1).
[0079] Referring to FIG. 1, the Oldham ring (160) can be slidably coupled to the main frame (130) and the rotating scroll (150), respectively, as previously described. However, depending on the case, the Oldham ring (160) may also be slidably coupled to the fixed scroll (140) and the rotating scroll (150), respectively. This embodiment is described with an example in which the Oldham ring (160) is slidably coupled to the main frame (130) and the rotating scroll (150).
[0080] For example, the Oldham ring (160) can be slidably coupled to the main frame (130) in a first radial direction and to the pivot scroll (150) in a second radial direction, which is orthogonal to the first radial direction. Accordingly, the Oldham ring (160) can limit the rotational movement of the pivot scroll (150) coupled to the rotation axis, thereby inducing the pivot scroll (150) to pivot relative to the main frame (130) and the fixed scroll (140). The Oldham ring (160) will be explained again later.
[0081] The scroll compressor according to the present embodiment as described above can be operated as follows.
[0082] That is, when power is applied to the drive motor (120), rotational force is generated in the rotor (122) and the rotation shaft (125) and rotates, and the rotary scroll (150) eccentrically coupled to the rotation shaft (125) rotates 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 rotary scroll (150), and the compression chambers (V) gradually narrow in volume as they move from the outer edge toward the center while the rotary scroll (150) rotates.
[0083] Then, the refrigerant flows into the compression chamber (V) through the refrigerant suction pipe (115) and the suction port (not shown) of the fixed scroll (140), and the refrigerant is compressed while moving toward the final compression chamber in the center by the rotational movement of the rotating scroll (150). The refrigerant can be discharged from the final compression chamber to the muffler space (170a) of the discharge cover (170) through the discharge port (1411) of the fixed scroll (140).
[0084] Then, this refrigerant may be discharged between the main frame (130) and the drive motor (120) through a discharge hole (not shown) provided in the fixed scroll (140) and the main frame (130), and may pass through the drive motor (120) and move to the upper space (S2) of the casing (110) formed on the upper side of the drive motor (120). In the upper space (S2), this refrigerant may be separated into refrigerant and oil, and the refrigerant may be discharged to the outside of the casing (110) through the refrigerant discharge pipe (116), while the oil may be recovered to the lower space (S1) of the casing (110) through the oil recovery passage (not shown), and this series of processes may be repeated.
[0085] Meanwhile, as previously explained, the swivel scroll (150) is slidably coupled to the Oldham ring (160) and rotates relative to the fixed scroll (140) and / or the main frame (130). Accordingly, it is advantageous for the Oldham ring (160) to be formed as lightly as possible to reduce the centrifugal force caused by the Oldham ring (160) and to increase motor efficiency.
[0086] However, as previously explained, the Oldham ring (160) is coupled to the rotating scroll and main frame in a radially sliding manner and receives rotational force from the rotation axis. As a result, the Oldham ring (160) must have sufficient rigidity to withstand the stress caused by rotational force to maintain reliability.
[0087] In particular, the ring body (161) of the Oldham ring (160), which will be described later, is formed in an elliptical shape, thereby generating different stresses in each part. In other words, the ring body (161) is formed in an elliptical shape with different radii at the part where the first key is formed and the part where the second key is formed, and as a result, different stresses are generated at each part where the key is formed. Accordingly, even if the weight of the Oldham ring (160) is reduced, it may be desirable to manufacture it by taking into account the stress generated in each part and the resulting rigidity in terms of the reliability of the Oldham ring (160).
[0088] Accordingly, in this embodiment, a weight reduction portion (164) is formed on the axial side of the Oldham ring (160) to reduce the weight of the Oldham ring (160), while the weight reduction portion (164) is formed in a region that generates relatively low stress to secure the necessary rigidity of the Oldham ring (160).
[0089] FIG. 2 is a disassembled perspective view of a compression section including an Oldham ring in a scroll compressor according to the present embodiment, FIG. 3 is a plan view showing the Oldham ring in FIG. 2, FIG. 4 is a cross-sectional view along line "IV-IV" of FIG. 3, and FIG. 5 is a cross-sectional view of a ring body shown to explain the specifications of the weight loss section according to the present embodiment.
[0090] Referring to FIGS. 2 to 5, the Oldham ring (160) according to the present embodiment may include a ring body (161), a first key (162), a second key (163), and a weight reduction part (164). The ring body (161) is a part that is supported axially between the frame plate part (131) of the main frame (130) and the pivot plate part (151) of the pivot scroll (150) facing it; the first key (162) is a part that is slidably coupled to the main frame (130) in a first radial direction; the second key (163) is a part that is slidably coupled to the pivot scroll (150) in a second radial direction; and the weight reduction part (164) is a part that reduces the weight of the Oldham ring (160).
[0091] The ring body (161) according to the present embodiment may be formed in an annular shape. In this case, the ring body (161) may be formed in an elliptical shape, and in some cases, may be formed in a circular shape. The present embodiment is described with an example in which the ring body (161) is formed in an elliptical shape.
[0092] Referring to FIGS. 2 and 3, the ring body (161) may be formed such that the first distance (D1) from the center (Oc1) of the ring body (161) to the center (Oc2) of the first key (162) described later is greater than the second distance (D2) to the center (Oc3) of the second key (163) described later. Accordingly, the ring body (161) may form an ellipse in which the virtual axis connecting the two first keys (162) forms the major axis, while the virtual axis connecting the two second keys (163) forms the minor axis.
[0093] The ring body (161) has an extension portion (1611) (1612) formed at a suitable location along the circumferential direction, and the extension portion (1611) (1612) may include a first extension portion (1611) where a first key (162) is formed and a second extension portion (1612) where a second key (163) is formed. For example, the ring body (161) may have the first extension portion (1611) and the second extension portion (1612) formed alternately along the circumferential direction with a phase difference of 90°. Accordingly, the first key (162) and the second key (163), which will be described later, may be formed alternately with a 90° interval.
[0094] The first extension (1611) and the second extension (1612) may each be extended radially. For example, the first extension (1611) and the second extension (1612) may be extended radially from the outer surface of the ring body (161), and in some cases, may be extended radially from the inner surface of the ring body (161). Of course, the first extension (1611) and the second extension (1612) may be extended radially from the outer surface and the inner surface of the ring body (161), respectively. The present embodiment discloses an example in which the first extension (1611) and the second extension (1612) are extended radially from the outer surface of the ring body (161).
[0095] Although not illustrated in the drawing, the previously described extensions (1611) (1612) may be excluded from the axial sides of the ring body (161). In this case, the first key (162) and the second key (163), which will be described later, may also be extended along the axial direction from each of the axial sides of the ring body (161).
[0096] The first key (162) according to the present embodiment extends along the axial direction from one side of the ring body (161) by a predetermined height, and may be formed as a single unit or formed by assembly. The present embodiment is described with an example in which the first key (162) is formed as a single unit from the ring body (161).
[0097] As previously described, the first key (162) may extend upward toward the first keyway (131a) from one side of the first extension part (1611) forming the ring body (161). For example, the first key (162) may extend as a single unit from the side facing the main frame (130) among the two axial sides of the first extension part (1611), and may extend radially to correspond to the first keyway (131a) of the main frame (130). Accordingly, the first key (162) of the Oldham ring (160) can restrict the rotational movement of the pivot scroll (150) together with the second key (163) to be described later, while reciprocating radially while inserted in a state of sliding contact with the circumferential side of the first keyway (131a) of the main frame (130).
[0098] The second key (163) according to the present embodiment extends along the axial direction from the other side of the ring body (161) by a predetermined height, and may be formed as a single unit or formed by assembly. The present embodiment is described with an example in which the second key (163) is formed as a single unit from the ring body (161).
[0099] As previously described, the second key (163) may extend downward toward the second key groove (151a) from one side of the second extension part (1612) forming the ring body (161). For example, the second key (163) may extend as a single unit from the side facing the pivot scroll (150) among the two axial sides of the second extension part (1612), and may extend radially to correspond to the second key groove (151a) of the pivot scroll (150). Accordingly, the second key (163) can restrict the rotational movement of the pivot scroll (150) together with the first key (162) described above while reciprocating radially while inserted in a state of sliding contact with the circumferential side of the second key groove (151a).
[0100] According to the present embodiment, the weight loss portion (164) may be formed to be recessed on one of the two axial sides (161a) (161b) of the ring body (161). Accordingly, as the weight loss portion (164) is excluded from one of the two axial sides (161a) (161b) of the ring body (161), the remaining portion excluding the weight loss portion (164) (e.g., thickness) increases, thereby suppressing deformation of the ring body (161).
[0101] For example, the weight reduction section (164) may be formed by being recessed with a predetermined depth and width in the first axial side (hereinafter, the first side) (161a) facing away from the rotating scroll (150), among the first side (161a) and the second side (161b) forming the axial side of the ring body (161). Accordingly, the weight reduction section (164) is excluded from the axial side (second side) (161b) facing the rotating scroll (150), where relatively large stress occurs, thereby ensuring higher rigidity of the ring body (161) under conditions where the cross-sectional area of the weight reduction section (164) (e.g., the height of the weight reduction section) is the same.
[0102] Specifically, the slimming section (164) can be formed between each first key (162) and second key (163) that are adjacent in the circumferential direction on the first side (161a) of the ring body (161) facing away from the rotating scroll (150), that is, between each first extension section (1611) and second extension section (1612) that are adjacent to each other in the circumferential direction. For example, a plurality of slimming sections (164) can be formed in an arc shape when projected in the axial direction and formed between each first key (162) and second key (163). Accordingly, the slimming section (164) is excluded from the area around the first key (162) and the area around the second key (163) on the ring body (161), so that the thickness of the flesh in that area can be increased accordingly. Through this, the weight of the Oldham ring (160) can be reduced while maintaining the rigidity of the Oldham ring (160) to suppress deformation.
[0103] In this case, the multiple weight loss parts (164) may be formed with the same shape and / or specifications, or with different shapes and / or specifications. In the former case, not only is it easy to manufacture the weight loss parts (164), but reliability can also be increased by ensuring a consistent balance of the Oldham ring (160), and in the latter case, the weight loss parts (164) can be added or removed as needed, allowing for active response. This embodiment illustrates an example in which multiple weight loss parts (164) are formed with the same shape and / or specifications. Therefore, the term "weight loss part (164)" below may be understood to refer to any one of the multiple weight loss parts (164) having the same shape and / or specifications.
[0104] Referring to FIGS. 4 and 5, the weight loss portion (164) according to the present embodiment may have a radial width (W2) and an axial height (H2) formed identically along the circumferential direction. For example, the weight loss portion (164) may have a radial width (W2) and an axial height (H2) formed identically between the two ends in the circumferential direction. Accordingly, the weight loss portion (164) is formed with the same shape and / or the same specifications along the circumferential direction, thereby making it easier to manufacture the weight loss portion (164). In addition, the stress in the portion where the weight loss portion (164) is formed (hereinafter referred to as the weight-loss portion) within the ring body (161) can be maintained uniformly to minimize deformation.
[0105] In this case, the thinning portion (164) may be formed such that the cross-sectional area of the thinning portion (164) is smaller than the cross-sectional area of the ring body (161). For example, the cross-sectional area of the thinning portion (164) may be formed such that it is approximately greater than or equal to 1 / 10 and less than or equal to 1 / 2 compared to the cross-sectional area of the ring body (161) excluding the thinning portion (164) in the thinning portion where the thinning portion (164) is formed. Accordingly, the weight of the Oldham ring (i.e., ring body) (160) in the thinning portion can be reduced as much as possible to increase motor efficiency, while the rigidity of the ring body (161) of the Oldham ring (160) is appropriately secured to increase the reliability of the Oldham ring (160).
[0106] According to the present embodiment, the side surface of the weight loss portion (164) may be formed as a flat surface or as a curved surface. In the former case, the cross-sectional area of the weight loss portion (164) can be secured as large as possible, and in the latter case, the stress in the weight loss portion (164) can be minimized as much as possible. Of course, the inner surface of the weight loss portion (164) may be formed as a combination of a flat surface and a curved surface. In this case, the cross-sectional area of the weight loss portion (164) can be secured as large as possible while the stress in the weight loss portion (164) can be reduced as much as possible. The present embodiment illustrates an example in which both sides of the weight loss portion (164) are formed as flat surfaces, for example, in a tapered flat shape.
[0107] Specifically, the weight loss portion (164) may include an inner surface (164a), an outer surface (164b), and a connecting surface (164c). The inner surface (164a) and the outer surface (164b) are surfaces that form a radial side, and the connecting surface (164c) is a surface that connects the inner surface (164a) and the outer surface (164b) to form an axial side.
[0108] In this case, at least one of the inner side (164a) and the outer side (164b) (in this embodiment, both inner sides) is formed to be inclined toward the opposite side as it approaches the center of the ring body (161), and the connecting side (164c) can be formed parallel to the axial side of the ring body (161) at the inner end (e.g., the bottom) of the inner side (164a) and the outer side (164b). Accordingly, the weight loss portion (164) is formed to gradually narrow toward the center from the axial side of the ring body (161), making it easy to manufacture the weight loss portion (164).
[0109] Referring to FIGS. 4 and 5, the axial height (hereinafter, average height) (H2) of the slimming portion (164) can be formed to be less than half the axial height (H1) of the ring body (161). For example, the axial height (H2) of the slimming portion (164) can be formed to be approximately greater than or equal to 0.3 times and less than or equal to 0.6 times the axial height (H1) of the ring body (161). Accordingly, by forming the axial height (H2) of the slimming portion (164) as large as possible, the weight of the Oldam ring (160) can be minimized as much as possible, while the axial height (i.e., thickness) (H11) of the ring body (161), excluding the slimming portion (164) in the slimmed-down area, can be secured as large as possible. Through this, the rigidity of the ring body (161) in the slimmed-down area can be properly secured, thereby minimizing deformation of the Oldham ring (160).
[0110] This can also be seen through FIG. 6a. FIG. 6a is a graph showing the amount of deformation of the Oldham ring according to the axial height of the weight loss section according to the radial width of the weight loss section. As shown in the figure, when the weight loss height (Hr), defined as the value obtained by dividing the axial height (H2) of the weight loss section (164) by the axial height (H1) of the ring body (161), is 0.3 or less, the change in the amount of deformation in the ring body (161) is significantly reduced, but the weight loss effect is not significant. On the other hand, when the weight loss height (Hr) is 0.6 or more, it can be seen that the amount of deformation of the Oldham ring (160) increases rapidly. Therefore, it may be advantageous to form the weight loss height (Hr) to be approximately 0.3 to 0.6, taking into account the weight reduction and deformation of the Oldham ring (160).
[0111] Referring again to FIGS. 4 and 5, the radial width (W2) of the weight loss portion (164) can be formed to be less than half the radial width (W1) of the ring body (161). For example, the radial width (W2) of the weight loss portion (164), which is the radial minimum distance between the inner surface (164a) and the outer surface (164b), can be formed to be approximately greater than or equal to 0.2 times and less than or equal to 0.6 times the radial width (W1) of the ring body (161). Accordingly, by forming the radial width (W2) of the weight loss portion (164) as large as possible, the weight of the Oldam ring (160) can be minimized as much as possible, while the radial width (W11) of the ring body (161), excluding the weight loss portion (164) in the weight-loss area, can be secured as large as possible. Through this, the rigidity of the ring body (161) in the slimmed-down area can be properly secured, thereby minimizing deformation of the Oldham ring (160).
[0112] This can also be seen through FIG. 6b. FIG. 6b is a graph showing the amount of deformation of the Oldham ring according to the radial width of the weight loss section and the lateral inclination angle of the weight loss section. As shown in the figure, when the weight loss width (Wr), defined as the value obtained by dividing the radial width (hereinafter, average width) (W2) of the weight loss section (164) by the radial width (W1) of the ring body (161), is 0.2 or less, the change in the amount of deformation decreases significantly, but the cross-sectional area of the weight loss section (164) decreases, and thus the weight loss effect in the ring body (161) does not increase as much. On the other hand, when the weight loss width (Wr) is 0.6 or more (for example, when the lateral inclination angle is 0° to 30°), it can be seen that the amount of deformation of the Oldham ring (160) increases rapidly. Therefore, it may be advantageous to form the weight reduction width (Wr) to be approximately 0.2 to 0.6, taking into account the weight reduction and deformation amount of the Oldham ring (160).
[0113] Referring again to FIGS. 4 and 5, the circumferential side of the slimming portion (164) may be formed to be inclined with respect to the axial direction. For example, the slimming angle of inclination (θ), defined by the inclination of the inner side (164a) and / or the outer side (164b), may be formed to be approximately greater than 0° and less than or equal to 60°. Accordingly, both sides (164a) and (164b) of the slimming portion (164) are formed to be inclined as little as possible, thereby reducing the weight of the Oldham ring (160) as much as possible, while ensuring that the radial width (W11) of the ring body (161), excluding the slimming portion (164) in the slimming area, is as large as possible. Through this, the rigidity of the ring body (161) in the slimming area is appropriately secured, thereby minimizing deformation of the Oldham ring (160).
[0114] This can also be seen through FIG. 6b, which was seen earlier. As illustrated therein, when the weight loss angle (θ) is 0°, the amount of deformation occurs even if the weight loss width (Wr) is set to the maximum value of 0.6. However, the cross-sectional area of the weight loss portion (164) is reduced, so the weight loss effect in the ring body (161) is not that great. On the other hand, when the weight loss angle (θ) becomes 60°, it can be seen that the amount of deformation of the Oldham ring (160) increases rapidly even when the weight loss width (Wr) is 0.2. Therefore, it may be advantageous to form the weight loss angle (θ) to be approximately 0° to 60°, taking into account the weight reduction and deformation of the Oldham ring (160).
[0115] Although not illustrated in the drawings, the inner surface (164a) and / or outer surface (164b) forming the circumferential side of the weight loss portion (164) may be formed with a step. For example, the inner surface (164a) and / or outer surface (164b) may each be formed along the axial direction, but with a step at the middle of the inner surface (164a) and / or outer surface (164b), the outer end of the weight loss portion (164) may be formed wider and the inner end narrower. In this case, the axial height and radial width of the weight loss portion (164) may be formed to be the same or nearly the same as the previously described embodiment.
[0116] In this way, the weight of the Oldham ring can be reduced to increase motor efficiency. In other words, by forming multiple weight-reducing sections on the ring body, the weight of the Oldham ring can be reduced by an amount equal to the volume of these sections. Through this, the motor input can be lowered by the amount of weight reduction of the Oldham ring coupled to the rotating scroll, thereby improving motor efficiency.
[0117] Furthermore, reliability can be ensured by reducing the weight of the ring body while suppressing its deformation. In other words, by forming a weight-reducing section only on the side of the ring body with relatively lower stress, the weight of the Oldham ring can be reduced by the volume of that section while maintaining the rigidity of the ring body. This effectively suppresses deformation of the ring body, thereby enhancing the reliability of the Oldham ring.
[0118] In addition, the ring body can be easily manufactured while reducing its weight and suppressing deformation. In other words, by forming a weight-reducing section only on the side with low stress among the two sides of the ring body, the weight of the Oldham ring is reduced while maintaining the rigidity of the ring body, and at the same time, the inner and / or outer surfaces of the weight-reducing section are formed at an angle, thereby enabling the easy manufacturing of the Oldham ring.
[0119] Meanwhile, other embodiments regarding the weight loss section are as follows.
[0120] That is, in the above-described embodiment, each weight loss part is formed with the same shape and / or specifications in the circumferential direction, but in some cases, each weight loss part may be formed with different shapes and / or specifications in the circumferential direction.
[0121] FIGS. 7 and FIGS. 8 are plan views showing different embodiments of the weight loss portion of the Oldham ring.
[0122] Referring again to FIGS. 3 and 4, the ring body (161) of the Oldham ring (160) according to the present embodiment is formed in an annular shape, and a first key (162) and a second key (163) may be alternately formed at 90° intervals along the circumferential direction on the first side (161a) and the second axial side (hereinafter, second side) (161b) of the ring body (161). In this case, a slimming part (164) having a preset axial depth (H2) and radial width (W2) may be formed on the first side (161a) of the ring body (161) that faces away from the pivot scroll (150), that is, among the two sides (161a) and (161b) of the ring body (161). Accordingly, the weight of the ring body (161) forming part of the Oldam ring (160) is reduced, thereby improving motor efficiency, while minimizing deformation of the ring body (161) to increase reliability. Since the basic configuration of the weight loss unit (164) according to this embodiment and the resulting effects are almost similar to the weight loss unit (164) of the previously described embodiment, the description thereof is replaced by the description of the previously described embodiment.
[0123] However, in the present embodiment, the weight loss portion (164) may have different axial heights (H2) and / or radial widths (W2) along the circumferential direction in a single weight loss portion (164). Accordingly, the weight of the ring body (161) forming part of the Oldham ring (160) is reduced, thereby improving motor efficiency, while further minimizing deformation of the ring body (161) in areas subjected to relatively high stress.
[0124] In this case, the weight loss portion (164) may be formed such that its axial height (H2) and / or radial width (W2) gradually increase or decrease along the circumferential direction, or may be formed such that it increases or decreases in stages. In the former case, deformation of the ring body (161) can be suppressed more effectively compared to the previously described embodiment, and in the latter case, deformation of the ring body (161) can be suppressed effectively compared to the previously described embodiment while making the weight loss portion (164) easier to manufacture. This embodiment illustrates an example in which the axial height (H2) and / or radial width (W2) of the weight loss portion (164) varies in stages.
[0125] As shown in FIG. 7, the weight loss section (164) according to the present embodiment may include a first weight loss section (1641) and a second weight loss section (1642). The first weight loss section (1641) is a part formed at a location adjacent to the first key (162), and the second weight loss section (1642) is a part formed at a location adjacent to the second key (163).
[0126] For example, the first weight loss section (1641) may be formed to have a first axial height (H21), and the second weight loss section (1642) may be formed to have a second axial height (H22). In other words, the first weight loss section (1641) and the second weight loss section (1642) may be connected to each other to form a single weight loss section (164), but the first weight loss section (1641) and the second weight loss section (1642) may be formed to have different axial heights.
[0127] In this case, the first axial height (H21) of the first weight loss section (1641) can be formed to be greater than the second axial height (H22) of the second weight loss section (1642). In other words, the second axial height (H22) of the second weight loss section (1642) adjacent to the second key (163) can be formed to be lower than the first axial height (H21) of the first weight loss section (1641) adjacent to the first key (162). Accordingly, the amount of weight loss around the second key (163), which has relatively high stress, can be formed to be smaller than the amount of weight loss around the first key (162), which has relatively low stress. Through this, the rigidity of the ring body (161) around the second key (163) can be further increased, thereby minimizing the deformation of the Oldham ring (160).
[0128] In addition, in this case, the first arc length (L21) of the first weight loss section (1641) and the second arc length (L22) of the second weight loss section (1642) may be formed identically or differently. In the former case, the first weight loss section (1641) and the second weight loss section (1642) can be easily formed, and in the latter case, the amount of weight loss around the second height (163) may be formed to be smaller than the amount of weight loss around the first height (162). This embodiment illustrates an example in which the first arc length (L21) of the first weight loss section (1641) and the second arc length (L22) of the second weight loss section (1642) are identical.
[0129] As described above, if the first axial height (H21) of the first weight loss section (1641) and the second axial height (H22) of the second weight loss section (1642) are formed differently, even if the stress in the second key (or the area around the second key) (163) is greater than the stress in the first key (or the area around the first key) (162), the amount of deformation in the first key (or the area around the first key) (162) and the second key (or the area around the second key) (163) can be kept as uniform as possible, thereby increasing the reliability of the Oldham ring (160).
[0130] Although not illustrated in the drawing, the weight loss section (164) may be formed by connecting three or more weight loss sections (164) having different axial heights in succession. In this case, the amount of deformation at each part of the ring body (161) can be maintained more uniformly.
[0131] As shown in FIG. 8, the weight loss section (164) according to the present embodiment includes a first weight loss section (1641) and a second weight loss section (1642), wherein the first weight loss section (1641) is formed to have a first radial width (W21) and the second weight loss section (1642) is formed to have a second radial width (W22). In other words, the first weight loss section (1641) and the second weight loss section (1642) are connected to each other to form a single weight loss section (164), and the first weight loss section (1641) and the second weight loss section (1642) may be formed to have different radial widths (W21) and (W22).
[0132] In this case, the first radial width (W21) of the first weight loss section (1641) can be formed larger than the second radial width (W22) of the second weight loss section (1642). In other words, the second radial width (W22) of the second weight loss section (1642) adjacent to the second key (163) can be formed smaller than the first radial width (W21) of the first weight loss section (1641) adjacent to the first key (162). Accordingly, the amount of weight loss around the second key (163) can be formed smaller than the amount of weight loss around the first key (162). Through this, the rigidity of the ring body (161) around the second key (163) can be further increased, thereby minimizing the deformation of the Oldham ring (160).
[0133] In addition, in this case, the first arc length (L21) of the first weight loss section (1641) and the second arc length (L22) of the second weight loss section (1642) may be formed identically or differently. In the former case, the first weight loss section (1641) and the second weight loss section (1642) can be easily formed, and in the latter case, the amount of weight loss around the second height (163) may be formed to be smaller than the amount of weight loss around the first height (162). This embodiment illustrates an example in which the first arc length (L21) of the first weight loss section (1641) and the second arc length (L22) of the second weight loss section (1642) are identical.
[0134] As described above, if the first radial width (W21) of the first weight loss section (1641) and the second radial width (W22) of the second weight loss section (1642) are formed differently, even if the stress in the second key (or the area around the second key) (163) is greater than the stress in the first key (or the area around the first key) (162), the amount of deformation in the first key (or the area around the first key) (162) and the second key (or the area around the second key) (163) can be kept as uniform as possible, thereby increasing the reliability of the Oldham ring (160).
[0135] Although not illustrated in the drawing, the weight loss section (164) may be formed by connecting three or more weight loss sections (164) having different radial widths in succession. In this case, the amount of deformation at each part of the ring body (161) can be maintained more uniformly.
[0136] Although not illustrated in the drawing, the first weight loss section (1641) may be formed to have a first inclination angle, and the second weight loss section (1642) may have a second inclination angle. For example, the first weight loss section (1641) and the second weight loss section (1642) may be connected to each other to form a single weight loss section (164), and the first inclination angle of the first weight loss section (1641) adjacent to the first key may be formed to be greater than the second inclination angle of the second weight loss section (1642) adjacent to the second key. Accordingly, the amount of weight loss around the second key (163) may be formed to be smaller than the amount of weight loss around the first key (162). Through this, the rigidity of the ring body (161) around the second key (163) can be further increased, thereby minimizing deformation of the Oldham ring (160).
[0137] Although not illustrated in the drawing, the first weight loss section (1641) may be formed to have a first axial depth and a first angle of inclination, and the second weight loss section (1642) may be formed to have a second axial depth and a second angle of inclination. For example, the first weight loss section (1641) and the second weight loss section (1642) may be connected to each other to form a single weight loss section (164), and the first axial depth and the first angle of inclination of the first weight loss section (1641) adjacent to the first height may be formed to be greater than the second axial depth and the second angle of inclination of the second weight loss section (1642) adjacent to the second height. Accordingly, the amount of weight loss around the second height (163) may be formed to be smaller than the amount of weight loss around the first height (162). Through this, the rigidity of the ring body (161) around the second key (163) can be further increased, thereby minimizing deformation of the Oldham ring (160).
[0138] Meanwhile, another embodiment regarding the weight loss section is as follows.
[0139] That is, in the aforementioned embodiments, one weight loss section is formed between each adjacent first key and second key, but in some cases, multiple weight loss sections may be formed spaced apart from each other along the circumferential direction between adjacent first key and second key.
[0140] FIG. 9 is a plan view showing another embodiment of the weight loss portion of the Oldham ring.
[0141] Referring again to FIGS. 3 and 4, the ring body (161) of the Oldham ring (160) according to the present embodiment is formed in an annular shape, and a first key (162) and a second key (163) may be alternately formed at 90° intervals along the circumferential direction on the first side (161a) and the second side (161b) of the ring body (161), respectively. In this case, a slimming part (164) having a preset axial height (H2) and radial width (W2) may be formed on one side of the ring body (161), that is, on the first side (161a) of the ring body (161) facing away from the rotating scroll among the two axial sides of the ring body (161). Accordingly, the weight of the ring body (161) forming part of the Oldam ring (160) is reduced, thereby improving motor efficiency, while minimizing deformation of the ring body (161) to increase reliability. Since the basic configuration of the weight loss unit (164) according to this embodiment and the resulting effects are almost similar to the weight loss unit (164) of the previously described embodiment, the description thereof is replaced by the description of the previously described embodiment.
[0142] However, according to the present embodiment, a plurality of weight loss sections (164) may be formed between adjacent first keys (162) and second keys (163) at a predetermined interval along the circumferential direction. For example, the weight loss section (164) may include a first weight loss section (1641) and a second weight loss section (1642), wherein the first weight loss section (1641) and the second weight loss section (1642) may be spaced apart from each other along the circumferential direction.
[0143] In this case, the first weight loss section (1641) and the second weight loss section (1642) may be formed with the same shape and / or specifications, or they may be formed with different shapes and / or specifications. In the former case, the weight loss section (164) can be formed in multiple numbers, and the weight loss section (164) can be formed easily. In the latter case, the amount of deformation of the ring body (161) can be further reduced by forming the weight loss section (164) differently, taking into account the different stresses in the first key (162) and the second key (163). This embodiment illustrates an example in which multiple weight loss sections (164) are formed in the same shape and / or specifications.
[0144] In addition, in this case, the first arc length (L21) of the first weight loss section (1641) and the second arc length (L22) of the second weight loss section (1642) may be formed identically or differently. In the former case, the first weight loss section (1641) and the second weight loss section (1642) can be easily formed, and in the latter case, the amount of weight loss around the second height (163) may be formed to be smaller than the amount of weight loss around the first height (162). This embodiment illustrates an example in which the first arc length (L21) of the first weight loss section (1641) is formed to be larger than the second arc length (L22) of the second weight loss section (1642).
[0145] As described above, when a plurality of thinning portions (164) are formed between the first key (162) and the second key (163) so as to be spaced apart from each other in the circumferential direction, a type of reinforcing portion (165) may be formed between the plurality of thinning portions (164). Accordingly, even if the stress in the second key (or the area around the second key) (163) is greater than the stress in the first key (or the area around the first key) (162), the amount of deformation in the first key (or the area around the first key) (162) and the second key (or the area around the second key) (163) can be maintained as uniformly as possible. Through this, the rigidity of the ring body (161) can be more appropriately secured, thereby increasing the reliability of the Oldham ring (160).
[0146] Meanwhile, the above-described embodiments focused on an example in which the Oldham ring (160) is provided between the main frame (130) and the pivot scroll (150) and is slidably coupled to the main frame (130) and the pivot scroll (150). In other words, the first key (162) and the second key (163) of the Oldham ring (160) protrude in opposite directions from both axial sides of the ring body (161), and the bidirectional Oldham ring (160) was described as an example.
[0147] However, in some cases, the Oldham ring (160) may be slidably coupled to the fixed scroll (140) and the rotating scroll (150), respectively. For example, the same can be applied to a unidirectional Oldham ring (160) in which the first key (162) and the second key (163) of the Oldham ring (160) protrude in the same direction from one axial side of the ring body (161).
[0148] FIG. 10 is a perspective view showing the compression section exploded to illustrate another embodiment of the Oldham ring.
[0149] As illustrated in FIG. 10, the Oldham ring (160) according to the present embodiment may include a ring body (161), a first key (162), a second key (163), and a weight loss part (164). Since the basic configuration of the ring body (161), the first key (162), the second key (163), and the weight loss part (164) and the resulting effects are similar to those of the previously described embodiment, the description thereof is replaced by the description of the previously described embodiment.
[0150] However, in this embodiment, the first key (162) and the second key (163) may each extend toward the fixed scroll (140) and the pivoting scroll (150) from the second side (161b) of the ring body (161). In other words, the first key (162) and the second key (163) may be formed alternately along the circumferential direction with a phase difference of 90°. Accordingly, the first key (162) is slidably coupled to the first key groove (141a) of the fixed scroll (140), and the second key (163) is slidably coupled to the second key groove (151a) of the pivoting scroll (150), so that the pivoting scroll (150) can pivot relative to the fixed scroll (140).
[0151] In this case, the weight reduction section (164) can be formed with a predetermined depth (axial height) (H2) and width (radial width) (W2) on the side facing the second key (163) among the two axial sides (161a) (161b) of the ring body (161). Accordingly, among the two axial sides (161a) (161b) of the ring body (161), the weight reduction section (164) is excluded from the second side (161b), which has relatively high stress, and the weight reduction section (164) is formed only on the first side (161a), which has low stress, thereby effectively suppressing deformation while reducing the weight of the Oldham ring (160).
[0152] In addition, in this case as well, the shape and / or specifications of the weight loss part (164) according to the present embodiment may be formed in the same way as the previously described embodiments. This is replaced by the description of the previously described embodiments.
Claims
1. Casing; A frame fixed to the above casing; A first scroll supported by the above frame; A second scroll provided between the frame and the first scroll, and rotating relative to the frame and the first scroll; and The Oldham ring comprises a ring body, a first key that is slidably inserted into a first keyway provided in the frame or the first scroll, and a second key that is slidably inserted into a second keyway provided in the second scroll. In the ring body of the above Oldham ring, A scroll compressor in which a weight-reduced portion is formed by being recessed on the side facing away from the second scroll among the axial sides of the ring body.
2. In Paragraph 1, The above weight loss unit is, A scroll compressor formed between the first key and the second key, which are adjacent to each other along the circumferential direction of the ring body.
3. In Paragraph 2, The above weight loss unit is, A scroll compressor formed one at a time between the first key and the second key, which are adjacent to each other along the circumferential direction of the ring body.
4. In Paragraph 2, The above weight loss unit is, A plurality of scroll compressors formed between the first key and the second key, which are adjacent to each other along the circumferential direction of the ring body.
5. In Paragraph 2, The cross-sectional area of the above-mentioned weight loss section is, A scroll compressor formed at a location where the above-mentioned weight-reducing portion is formed, with a cross-sectional area smaller than that of the ring body excluding the weight-reducing portion.
6. In Paragraph 5, The cross-sectional area of the above-mentioned weight loss section is, A scroll compressor formed to be approximately greater than or equal to 1 / 10 and less than or equal to 1 / 2 relative to the cross-sectional area of the ring body.
7. In Paragraph 2, The above weight loss unit is, Inner side; An outer surface spaced apart from the inner surface by a predetermined interval; and It includes a connecting surface connecting the inner surface and the outer surface, The above inner surface and the above outer surface are, A scroll compressor formed to be inclined or orthogonal to the above-mentioned connection side.
8. In Paragraph 7, The height of each of the inner surface and the outer surface is, A scroll compressor formed to be greater than or equal to 0.3 times the height of the ring body and less than or equal to 0.6 times.
9. In Paragraph 7, The width of the above-mentioned connection side is, A scroll compressor formed to be greater than or equal to 0.2 times and less than or equal to 0.6 times the width of the ring body.
10. In Paragraph 7, At least one of the inner surface and the outer surface is formed to be inclined with respect to the axial direction, and The inclination angle of the inner surface and / or the outer surface is, A scroll compressor formed to be greater than 0° and less than or equal to 60°.
11. In any one of paragraphs 1 through 10, The above weight loss unit is, A scroll compressor in which the height of the weight-loss section is formed uniformly along the circumferential direction.
12. In any one of paragraphs 1 through 10, The above weight loss unit is, A scroll compressor in which the height of the second weight loss section adjacent to the second key is formed to be smaller than the height of the first weight loss section adjacent to the first key.
13. In any one of paragraphs 1 through 10, The above weight loss unit is, A scroll compressor in which the width of the weight-reducing section is formed uniformly along the circumferential direction.
14. In any one of paragraphs 1 through 10, The above weight loss unit is, A scroll compressor in which the width of the second weight loss section adjacent to the second key is formed to be smaller than the width of the first weight loss section adjacent to the first key.