Scroll compressor

Abstract

A scroll compressor is disclosed. The scroll compressor may comprise a casing, an orbiting scroll, a non-orbiting scroll, a first main frame, a second main frame, and an anti-rotation member, wherein the anti-rotation member is provided between the first main frame and the second main frame, and the second main frame overlaps the anti-rotation member in the axial direction of a rotation axis. Through this, a wide thrust surface is secured between the orbiting scroll and the main frame supporting orbiting scroll in the axial direction, thereby stably supporting the orbiting scroll, increasing the motion stability of the orbiting scroll, and enhancing the compression efficiency.

Description

scroll compressor

[0001] The present invention relates to a scroll compressor, and more particularly to a fixed-pressure scroll compressor.

[0002] A scroll compressor is a combination of an orbiting scroll and a non-orbiting scroll that are interlocked and combined, and the orbiting scroll orbits the non-orbiting scroll, forming a pair of compression chambers between the orbiting scroll and the non-orbiting scroll.

[0003] The orbiting scroll is axially supported by a main frame fixed to the inner surface of the casing, and the non-orbiting scroll is fixedly connected to the main frame with the orbiting scroll in between, or is axially movably connected with respect to the main frame. The method in which the non-orbiting scroll is fixedly connected to the main frame can be defined as an orbiting back pressure method, and the method in which the non-orbiting scroll is axially movably connected with respect to the main frame can be defined as a fixed back pressure method. Hereinafter, the scroll compressor can be understood as a scroll compressor of the fixed back pressure method.

[0004] Patent Document 1 (US Patent Publication No. US2016 / 0298885 A1) and Patent Document 2 (US Patent Publication No. US2020 / 0309124 A1) disclose fixed-back pressure scroll compressors. The scroll compressors disclosed in these patent documents have a back pressure chamber formed on the back surface of a non-orbiting scroll. Accordingly, the orbiting scroll is supported axially by a main frame, and a thrust surface is formed between the scroll support surfaces of the main frame facing the back surface of the orbiting scroll.

[0005] However, since the conventional scroll compressor as described above has an Oldham ring, which is an anti-rotation member, installed between the main frame and the orbiting scroll, the area of ​​the scroll support surface of the main frame is inevitably limited. In other words, since the Oldham ring is installed on the scroll support surface of the main frame facing the back of the orbiting scroll, the scroll support surface of the main frame is formed on the inner side of the Oldham ring. This narrows the area of ​​the scroll support surface, which may cause the behavior of the orbiting scroll to become unstable and the compression efficiency to decrease. Taking this into account, if the area of ​​the scroll support surface is expanded, the outer diameter of the main frame as well as the outer diameter of the casing may increase.

[0006] The purpose of the present invention is to provide a scroll compressor capable of stabilizing the behavior of an orbiting scroll and thereby increasing compression efficiency.

[0007] Another object of the present invention is to provide a scroll compressor capable of expanding the scroll support surface of the mainframe without increasing the outer diameter of the mainframe.

[0008] Another object of the present invention is to provide a scroll compressor capable of stably supplying oil to a thrust surface between a main frame and an orbiting scroll while expanding the scroll support surface of the main frame.

[0009] In order to achieve the object of the present invention, the apparatus may include a casing, an orbiting scroll, a non-orbiting scroll, a first main frame, a second main frame, and an anti-rotation member. The orbiting scroll may be coupled to a rotational shaft in an internal space of the casing and may perform an orbital movement. The non-orbiting scroll may be engaged with the orbiting scroll to form a compression chamber. The first main frame may be fixed to the internal space of the casing. The second main frame may be provided between the first main frame and the orbiting scroll to support the orbiting scroll. The anti-rotation member may be provided between the first main frame and the second main frame to suppress rotation of the orbiting scroll. The second main frame may overlap the anti-rotation member in the axial direction of the rotational shaft. This allows for a wide thrust surface between the orbiting scroll and the main frame supporting it axially, thereby stably supporting the orbiting scroll and thereby enhancing the motion stability of the orbiting scroll, thereby improving compression efficiency. In other words, the scroll support surface supporting the orbiting scroll is expanded to a position where it overlaps the anti-rotation member, thereby ensuring the widest possible thrust surface.

[0010] For example, the anti-rotation member may include a ring body, a first key, and a second key. The ring body may be provided between the first main frame and the second main frame. The first key may extend from a first side of the ring body and be slidably coupled to the first main frame. The second key may extend from a second side of the ring body and be slidably coupled to the orbiting scroll. The second key may pass through the second main frame and be slidably coupled to the orbiting scroll. Through this, an Oldham ring may be provided between a plurality of main frames to secure a wide scroll support surface, while the orbiting scroll may be coupled to the Oldham ring to smoothly rotate.

[0011] For example, the first main frame may be formed with a first key groove into which the first key is slidably inserted, and the orbiting scroll may be formed with a second key groove into which the second key is slidably inserted. The second main frame may be formed with a key receiving portion through which the second key passes in the axial direction of the rotation shaft. Through this, an Oldham ring in which keys extend in both directions is provided between a plurality of main frames, and one key of the Oldham ring can pass through the second main frame and be smoothly coupled with the orbiting scroll.

[0012] Specifically, the key receiving portion may be formed in a hole shape radially spaced from the outer surface of the second main frame. This allows a scroll support surface to be formed on the outer surface of the key receiving portion, thereby forming a thrust surface as wide as possible.

[0013] In addition, the key receiving portion may be formed in a groove shape by being sunken in the radial direction of the rotation axis on the outer surface of the second main frame. This makes it possible to easily form the key receiving portion while reducing the weight of the second main frame.

[0014] In another embodiment, the anti-rotation member may include a ring body, a first key, and a second key. The ring body may be provided between the first main frame and the second main frame. The first key may extend from a second side of the ring body and be slidably coupled to the non-orbiting scroll. The second key may extend in a second axial direction of the ring body and be slidably coupled to the orbiting scroll. The first and second keys may pass through the second main frame and be slidably coupled to the non-orbiting scroll and the orbiting scroll, respectively. Through this, the key of the Oldham ring is formed in one direction, thereby increasing the workability of the Oldham ring and other parts coupled with the Oldham ring, while securing a scroll support surface that supports the orbiting scroll in the axial direction as wide as possible.

[0015] For example, the first main frame may be formed with a first key groove into which the first key is slidably inserted, and the orbiting scroll may be formed with a second key groove into which the second key is slidably inserted. The second main frame may be formed with a first key receiving portion through which the first key passes, and a second key receiving portion may be formed between the circumferences of the first key receiving portions through which the second key passes. Through this, while an Oldham ring in which keys are formed in one direction is provided between a plurality of main frames, the keys on both sides of the Oldham ring can pass through the second main frame, respectively, and be smoothly coupled to the orbiting scroll.

[0016] Specifically, at least one of the first key receiving portion and the second key receiving portion may be formed in a hole shape spaced apart from the outer surface of the second main frame in the radial direction of the rotation axis. Through this, a scroll support surface may be formed on the outer surface of the first key receiving portion and / or the second key receiving portion, thereby forming a thrust surface as wide as possible.

[0017] In addition, at least one of the first key receiving portion and the second key receiving portion may be formed in a groove shape by being sunken in the radial direction of the rotation axis on the outer surface of the second main frame. Through this, the first key receiving portion and the second key receiving portion can be easily formed while reducing the weight of the second main frame.

[0018] In another embodiment, a shaft hole for supporting the rotation shaft may be formed at the center of the first main frame, and a pivot space may be formed around the shaft hole to be sunken to a preset depth. A balance weight coupled to the rotation shaft may be accommodated in the pivot space. Through this, oil accommodated inside the pivot space may be dispersed by the balance weight, smoothly supplying the thrust surface between the main frame and the rotation scroll, thereby expanding the scroll support surface while suppressing friction loss.

[0019] For example, a boss receiving portion may be formed at the center of the second main frame, into which a rotation shaft coupling portion, which is coupled to the rotation shaft, of the rotation scroll may be rotatably inserted. The rotation space portion may be formed such that at least a portion overlaps the boss receiving portion in the axial direction of the rotation shaft. Through this, the inner diameter of the second main frame may be formed to be smaller than the inner diameter of the rotation space portion, thereby increasing the area of ​​the scroll support surface.

[0020] In another embodiment, a frame support projection extending toward the opposite mainframe may be formed on one of the first mainframe and the second mainframe, and a frame support groove may be formed on the other mainframe so that the frame support projection is inserted therein. Through this, the number of fastening members for fastening the first mainframe and the second mainframe may be minimized or the fastening members may be eliminated, while the first mainframe and the second mainframe may be firmly fixed.

[0021] For example, the frame support protrusion may extend from one side of the first main frame facing the non-orbiting scroll toward the non-orbiting scroll, and the frame support groove may be recessed into the outer circumferential surface of the second main frame in the radial direction of the rotation axis. The frame support protrusion and the frame support groove may be formed such that at least a portion thereof overlaps with each other in the circumferential direction. Through this, the frame support protrusion may be inserted into the frame support groove and may be restrained in the circumferential direction.

[0022] Specifically, a back pressure chamber assembly is provided on the back surface of the non-orbiting scroll, and a back pressure chamber is formed in the back pressure chamber assembly to communicate with the compression chamber, and a guide member can be slidably coupled to the non-orbiting scroll. The guide member can be supported on an end surface of the frame support protrusion. Accordingly, since the guide member is axially supported on the first main frame fixed to the casing, the assembly reliability of the guide member is secured even when separated into a plurality of pieces, and the axial movement of the non-orbiting scroll can be stably maintained.

[0023] More specifically, the height of the frame support protrusion may be formed to be equal to or smaller than the thickness of the second main frame. Through this, the orbiting scroll can be stably supported on the second main frame coupled to the first main frame by axially contacting and supporting the second main frame while the second main frame is in close contact with the first main frame.

[0024] A scroll compressor according to the present invention comprises a casing, an orbiting scroll, a non-orbiting scroll, a first main frame, a second main frame, and an anti-rotation member, wherein the anti-rotation member is provided between the first main frame and the second main frame, and the second main frame can overlap the anti-rotation member in the axial direction of the rotation shaft. Through this, a wide thrust surface is secured between the orbiting scroll and the main frame that supports the orbiting scroll in the axial direction, thereby stably supporting the orbiting scroll, thereby increasing the motion stability of the orbiting scroll and improving the compression efficiency.

[0025] A scroll compressor according to the present invention comprises a rotation preventing member comprising a ring body, a first key, and a second key, wherein the first key extends in a first axial direction from a first side of the ring body and is slidably coupled to a first main frame, and the second key extends in a second axial direction from a second side of the ring body and passes through the second main frame and is slidably coupled to an orbiting scroll. Through this, an Oldham ring is provided between a plurality of main frames to secure a wide scroll support surface, and the orbiting scroll is coupled to the Oldham ring to smoothly rotate.

[0026] A scroll compressor according to the present invention comprises a rotation preventing member comprising a ring body, a first key, and a second key, wherein the first and second keys extend in a second axial direction from a second side of the ring body, respectively, and pass through a second main frame, and are then slidably coupled to a non-orbiting scroll and an orbiting scroll, respectively. Through this, the key of the Oldham ring is formed in one direction, thereby increasing the workability of the Oldham ring and other parts coupled with the Oldham ring, while also ensuring a scroll support surface that supports the orbiting scroll in the axial direction as wide as possible.

[0027] In a scroll compressor according to the present invention, a pivot space may be formed at the center of the first main frame to accommodate a balance weight. This allows oil accommodated within the pivot space to be dispersed by the balance weight, smoothly supplying the thrust surface between the main frame and the pivot scroll, thereby expanding the scroll support surface while minimizing frictional losses.

[0028] According to the present invention, a scroll compressor may be provided such that a frame support projection extending axially toward the opposite main frame is formed on one of the first main frame and the second main frame, and a frame support groove may be formed on the other main frame so that the frame support projection is inserted therein. Through this, the number of fastening members for fastening the first main frame and the second main frame can be minimized or the fastening members can be eliminated while still firmly fixing the first main frame and the second main frame.

[0029] Fig. 1 is a longitudinal cross-sectional view showing the inside of a scroll compressor according to the present invention.

[0030] Fig. 2 is a plan view showing the compression section in Fig. 1.

[0031] Figure 3 is a cross-sectional view taken along line “Ⅲ-Ⅲ” of Figure 2.

[0032] Figure 4 is a perspective view showing the main frame of a scroll compressor according to the present invention in an exploded form.

[0033] Figure 5 is a perspective view showing the assembled main frame of Figure 4.

[0034] Figure 6 is a plan view of Figure 5.

[0035] Figure 7 is a cross-sectional view taken along line “Ⅶ-Ⅶ” of Figure 6.

[0036] Figure 8 is an exploded perspective view showing another embodiment of a mainframe.

[0037] Figure 9 is an assembly plan view of Figure 8.

[0038] Figure 10 is an exploded perspective view showing another embodiment of the mainframe.

[0039] Figure 11 is a perspective view showing the assembled main frame in Figure 10.

[0040] Plan view of Fig. 12 and Fig. 11.

[0041] Figure 13 is a cross-sectional view taken along the line “XIII-XIII” of Figure 12.

[0042] Hereinafter, a scroll compressor according to the present invention will be described in detail based on an embodiment illustrated in the attached drawings.

[0043] Typically, scroll compressors can be categorized as open or sealed types depending on whether the drive unit (transmission unit) and the compression unit are installed together in the internal space of the casing. The former is a type in which the transmission unit forming the drive unit is installed separately from the compression unit, while the sealed type is a type in which the transmission unit is installed within the same casing as the compression unit. The following description will use a sealed scroll compressor as an example, but is not necessarily limited to a sealed scroll compressor. In other words, the present invention can be equally applied to an open scroll compressor in which the transmission unit and the compression unit are separated.

[0044] In addition, scroll compressors are classified into low-pressure compressors and high-pressure compressors depending on the pressure part formed by the internal space of the casing, particularly the space accommodating the electric motor in a hermetic scroll compressor. In the former, the space forms a low-pressure part, and the refrigerant suction pipe is connected to the space, and in the latter, the space forms a high-pressure part, and the refrigerant suction pipe penetrates the casing and is directly connected to the compression part. This embodiment is described using a low-pressure scroll compressor as an example. However, it is not limited to the low-pressure scroll compressor.

[0045] In addition, scroll compressors can be divided into vertical scroll compressors in which the rotation axis is arranged perpendicular to the ground and horizontal scroll compressors in which the rotation axis is arranged parallel to the ground. For example, in a vertical scroll compressor, the upper side can be defined as the side opposite to the ground, and the lower side can be defined as the side facing the ground. The following description will be given using a vertical scroll compressor as an example. However, the same or similar application can be applied to a horizontal scroll compressor. Therefore, the axial direction is understood as the axial direction of the rotation axis, the radial direction is understood as the radial direction of the rotation axis, and the axial direction can be understood as the up-down direction, the radial direction can be understood as the left and right sides, the inner surface can be understood as the upper surface, and the axial radial direction can be understood as the side, respectively.

[0046] Fig. 1 is a longitudinal cross-sectional view showing the inside of a scroll compressor according to the present invention, Fig. 2 is a plan view showing the compression section in Fig. 1, and Fig. 3 is a cross-sectional view taken along line “Ⅲ-Ⅲ” of Fig. 2.

[0047] Referring to FIG. 1, in the scroll compressor according to the present embodiment, a driving motor (120) forming an electric power unit is installed in the lower half of a casing (110), and a main frame (130), a rotating scroll (140), a non-orbiting scroll (150), and a back pressure chamber assembly (160) forming a compression unit are installed in the upper part of the driving motor (120). The electric power unit is coupled to one end of a rotating shaft (125), and the compression unit is coupled to the other end of the rotating shaft (125). Accordingly, the compression unit is connected to the electric power unit by the rotating shaft (125) and operates by the rotational force of the electric power unit.

[0048] Referring to FIG. 1, the casing (110) according to the present embodiment may include a cylindrical shell (111), an upper cap (112), and a lower cap (113).

[0049] The cylindrical shell (111) has a cylindrical shape with both upper and lower ends open, and the aforementioned driving motor (120) and main frame (130) can be inserted and fixed on the inner surface. A terminal bracket (not shown) is coupled to the upper half of the cylindrical shell (111). A terminal (not shown) for transmitting external power to the driving motor (120) can be coupled through the terminal bracket. In addition, a refrigerant suction pipe (117) can be coupled through the upper half of the cylindrical shell (111), for example, the upper side of the driving motor (120).

[0050] The upper cap (112) can be coupled to cover the opened upper portion of the cylindrical shell (111). The lower cap (113) can be coupled to cover the opened lower portion of the cylindrical shell (111). The rim of a high-low pressure separation plate (115), which will be described later, can be inserted between the cylindrical shell (111) and the upper cap (112) and welded together to the cylindrical shell (111) and the upper cap (112). The rim of a support bracket (116) can be inserted between the cylindrical shell (111) and the lower cap (113) and welded together to the cylindrical shell (111) and the lower cap (113). Accordingly, the internal space of the casing (110) can be sealed.

[0051] The rim of the high-low pressure separator (115) can be welded to the casing (110) as described above. The central portion of the high-low pressure separator (115) can be bent to protrude toward the upper surface of the upper cap (112) and placed on the upper side of the back pressure chamber assembly (160) to be described later. A refrigerant suction pipe (117) can be connected to the lower side of the high-low pressure separator (115), and a refrigerant discharge pipe (118) can be connected to the upper side. Accordingly, a low pressure portion (110a) forming a suction space can be formed on the lower side of the high-low pressure separator (115), and a high pressure portion (110b) forming a discharge space can be formed on the upper side.

[0052] In addition, the lower cap (113) can form an oil storage space (110c) together with the lower half of the cylindrical shell (111) forming the low-pressure portion (110a). In other words, the oil storage space (110c) is formed in the lower half of the low-pressure portion (110a), and the oil storage space (110c) can form a part of the low-pressure portion (110a).

[0053] Referring to Fig. 1, the driving motor (120) according to the present embodiment is installed in the lower half of the low-pressure portion (110a) and may include a stator (121) and a rotor (122). The stator (121) is fixed to the inner wall surface of the cylindrical shell (111) by hot pressing, and the rotor (122) may be rotatably provided inside the stator (121).

[0054] The stator (121) may include a stator core (1211) and a stator coil (1212).

[0055] The stator core (1211) is formed in a cylindrical shape and can be fixed to the inner surface of the cylindrical shell (111) by hot pressing. The stator coil (1212) is wound around the stator core (1211) and can be electrically connected to an external power source through a terminal (not shown) that is penetrated and connected to the casing (110).

[0056] The rotor (122) may include a rotor core (1221) and a permanent magnet (1222).

[0057] The rotor core (1221) is formed in a cylindrical shape and can be rotatably inserted into the interior of the stator core (1211) at a predetermined gap interval. The permanent magnet (1222) can be embedded in the interior of the rotor core (1222) at a predetermined gap interval along the circumference.

[0058] In addition, a rotational shaft (125) may be press-fitted and coupled to the center of the rotor core (1221). An orbiting scroll (140), which will be described later, may be eccentrically coupled to the upper end of the rotational shaft (125). Accordingly, the rotational force of the driving motor (120) may be transmitted to the orbiting scroll (140) through the rotational shaft (125).

[0059] An eccentric portion (1251) that is eccentrically coupled to a rotating scroll (140) to be described later may be formed at the upper end of the rotating shaft (125). An oil pickup (126) for sucking up oil stored in the lower part of the casing (110) may be installed at the lower end of the rotating shaft (125). The rotating shaft (125) may be formed with an oil passage (1252) extending axially therethrough.

[0060] Referring to FIGS. 1 to 3, the main frame (130) according to the present embodiment is installed on the upper side of the driving motor (120) and can be fixed by hot pressing or welding to the inner wall surface of the cylindrical shell (111).

[0061] The main frame (130) according to the present embodiment may include a first main frame (131) and a second main frame (132). In other words, the main frame (130) may be divided into a plurality of parts and arranged on both sides along the axial direction, and an Oldham ring (170) may be provided between the first main frame (131) and the second main frame (132). Accordingly, the scroll support surface (1321a) of the main frame (130) supporting the rear surface of the orbiting scroll (140) may be formed larger than the Oldham ring (170). In other words, the maximum outer diameter (D1) of the scroll support surface (1321a) may be formed larger than the minimum inner diameter (D2) of the Oldham ring (170), so that the area of ​​the scroll support surface (1321a) may be enlarged. The main frame (130) will be described later together with the Oldham ring (170).

[0062] Although not illustrated in the drawing, the first main frame (131) may be defined as a main frame, and the second main frame (132) may be defined as a thrust plate. In other words, the first main frame (131) is a member fixed to the casing (110), so it may be defined as a main frame as commonly understood, and the second main frame (132) is a member that forms a thrust surface by being arranged between the Oldham ring (170), which is a rotation-preventing member, and the orbiting scroll (140), so it may be defined as a thrust plate as commonly understood. However, as described above, the main frame (130) is defined and explained as consisting of the first main frame (131) and the second main frame (132).

[0063] Referring to FIGS. 1 and 3, the orbiting scroll (140) according to the present embodiment may be coupled to a rotation shaft (125) and provided between the main frame (130) and the non-orbiting scroll (150). An anti-rotation member, an Oldham ring (170), may be mechanically coupled between the main frame (130) and the orbiting scroll (140). However, as described above, the ring body (171) of the Oldham ring (170) is provided between the first main frame (131) and the second main frame (132), so that the first key (172) of the Oldham ring (170), which will be described later, can be slidably inserted into the first key home (1314a) provided in the first main frame (131), and the second key (173) of the Oldham ring (170), which will be described later, can be slidably inserted into the second key home (141a) provided in the orbiting scroll (140). Accordingly, the orbiting scroll (140) performs an orbiting motion with respect to the non-orbiting scroll (150) while its rotational motion is restricted.

[0064] Specifically, the rotating scroll (140) may include a rotating plate portion (141), a rotating wrap (142), and a rotating shaft coupling portion (143).

[0065] The pivot plate (141) is formed in a roughly circular shape and can be supported in the axial direction by being placed on the second main frame (132). Accordingly, a thrust surface (not shown) can be formed between the pivot plate (141) and the scroll support surface (1321a) of the second main frame (132) that faces it.

[0066] In addition, a second keyway (141a) extending radially from the outer circumference may be formed on the back surface of the pivot plate (141), that is, on the other side facing the second main frame (132). A second keyway (173) of an old ring (170), which will be described later, may be inserted into the second keyway (141a) so as to slide radially. Accordingly, the pivot scroll (140) receives the rotational force of the driving motor (120) and performs a pivotal movement with respect to the non-rotating scroll (150).

[0067] The orbiting wrap (142) may be formed in a spiral shape by protruding at a preset height from the upper surface of the orbiting plate portion (141) facing the non-orbiting scroll (150). The orbiting wrap (142) may be formed corresponding to the non-orbiting wrap (152) of the non-orbiting scroll (150) to perform an orbiting motion by interlocking with the non-orbiting wrap (152). Accordingly, the orbiting wrap (142) may form a compression chamber (V) together with the non-orbiting wrap (152).

[0068] The rotary shaft coupling portion (143) is formed in a cylindrical shape by protruding from the lower surface of the rotary plate portion (141) toward the main frame (130), and a rotary bearing (not shown) made of a bushing bearing can be press-fitted into the inner circumferential surface of the rotary shaft coupling portion (143). An eccentric portion (1251) of the rotary shaft (125) can be rotatably coupled to the inside of the rotary shaft coupling portion (143). Accordingly, the rotary force of the driving motor (120) can be transmitted to the rotary scroll (140) through the rotary shaft (125).

[0069] Referring to FIGS. 1 to 3, the non-orbiting scroll (150) according to the present embodiment may be placed on the upper portion of the main frame (130) with the orbiting scroll (140) interposed therebetween. The non-orbiting scroll (150) may be fixedly coupled to the main frame (130) or may be coupled so as to be movable in the vertical direction. The present embodiment illustrates an example in which the non-orbiting scroll (150) is coupled so as to be movable in the axial direction with respect to the main frame (130).

[0070] A non-orbiting scroll (150) according to the present embodiment may include a non-orbiting plate portion (151), a non-orbiting wrap (152), a non-orbiting side wall portion (153), and a guide projection portion (154).

[0071] The non-orbiting plate portion (151) is formed in a circular shape and can be arranged laterally in the low-pressure portion (110a) of the casing (110). A back pressure chamber assembly (160), which will be described later, can be fastened to the back surface of the non-orbiting plate portion (151). Accordingly, the non-orbiting scroll (150) can move axially according to the back pressure of the back pressure chamber assembly (160), and the contact strength with the orbiting scroll (140) can be adjusted.

[0072] A discharge port (1511), a bypass hole (1512), and a first back pressure hole (1513) may be formed to penetrate axially through the central portion of the non-rotating plate portion (151). The discharge port (1511) may be formed at the center of the non-rotating plate portion (151), the bypass hole (1512) may be formed to communicate with a compression chamber (V) having a lower pressure than the pressure of the compression chamber (V) to which the discharge port (1511) is communicated, and the first back pressure hole (1513) may be formed to communicate with a compression chamber (V) having a lower pressure than the pressure of the compression chamber (V) to which the bypass hole (1512) is communicated.

[0073] The first back pressure hole (1513) is formed by axially penetrating the non-rotating plate portion (151) and can be connected to a compression chamber (V) having an intermediate pressure between the suction pressure and the discharge pressure. Only one first back pressure hole (1513) may be formed and connected to one of the two compression chambers (V), or multiple first back pressure holes (1513) may be provided and connected to each of the two compression chambers (V).

[0074] The non-rotating wrap (152) can be formed to extend axially from the lower surface of the non-rotating plate portion (151). The non-rotating wrap (152) is formed in a spiral shape inside the non-rotating side wall portion (153), and can be formed to correspond to the rotating wrap (142) so as to be interlocked with the rotating wrap (142).

[0075] The non-rotating side wall portion (153) may be formed in a ring shape by extending axially from the lower edge of the non-rotating plate portion (151) to surround the non-rotating wrap (152). A suction port (not shown) penetrating radially may be formed on one side of the outer circumference of the non-rotating side wall portion (153). Accordingly, the volume of the compression chambers (V) on both sides becomes narrower from the outer circumference to the center, thereby compressing the suctioned refrigerant.

[0076] The guide protrusion (154) may extend radially from the lower outer circumference of the non-rotating side wall (153). The guide protrusion (154) may be formed in a single ring shape, or a plurality of guide protrusions (154) may be formed at predetermined intervals along the circumference. This embodiment will be described with reference to an example in which a plurality of guide protrusions (154) are formed at predetermined intervals along the circumference.

[0077] A plurality of guide protrusions (154) can be respectively coupled to the frame support protrusions (1316) of the first main frame (131) to be described later by the guide members (155). For example, a guide hole (1541) penetrating in the axial direction may be formed in each of the plurality of guide protrusions (154), and a guide groove (1316a) may be respectively formed on the end surface of the frame support protrusion (1316) of the first main frame (131) to enable the plurality of guide members (155) passing through the guide holes (1541) to be coupled by being supported in the axial direction. Accordingly, since the guide member (155) is axially supported on the first main frame (131) fixed to the casing (110), the assembly reliability of the guide member (155) is secured even when it is separated into multiple pieces by the main frame (130), and thus the axial movement of the non-rotating scroll (150) can be stably maintained.

[0078] The guide groove (1316a) may be formed by being sunken or penetrating along the same axis as the guide hole (1541). Accordingly, the guide member (154) may pass through the guide hole (1541) and be coupled to the guide groove (1316a) along the same axis. Through this, the non-rotating scroll (150) may be axially movable by the guide member (154) while being restrained in the circumferential direction. The guide projection (154) will be described later together with the frame support projection (1316).

[0079] Referring to FIG. 1, the back pressure chamber assembly (160) according to the present embodiment may be provided on one side of the non-orbiting scroll (150), that is, on the opposite side of the main frame (130). Accordingly, the back pressure of the back pressure chamber (160a) (more precisely, the force exerted by the back pressure on the back pressure chamber) acts on the non-orbiting scroll (150). In other words, as described above, the non-orbiting scroll (150) is pressed in the direction toward the orbiting scroll (140) by the back pressure of the back pressure chamber assembly (160), thereby sealing the space between the two compression chambers (V).

[0080] Specifically, the back pressure chamber assembly (160) may include a back pressure plate (161) and a floating plate (165). The back pressure plate (161) may be coupled to the upper surface of the non-rotating plate portion (151), and the floating plate (165) may be slidably coupled to the back pressure plate (161). Accordingly, a back pressure chamber (160a) may be formed between the back pressure plate (161) and the floating plate (165).

[0081] In the drawing, the unexplained symbol 127 is a balance weight, 1512 is a bypass hole, 1611 is a second back pressure hole, and 1612 is a middle discharge port.

[0082] The scroll compressor according to the above embodiment operates as follows.

[0083] That is, when power is applied to the driving motor (120) to generate rotational force, the orbiting scroll (140) eccentrically coupled to the rotation shaft (125) orbits the non-orbiting scroll (150) by the Oldham ring (170). At this time, a compression chamber (V) that moves continuously is formed between the orbiting scroll (140) and the non-orbiting scroll (150). The volume of the compression chamber (V) gradually narrows as it moves from the suction port (or suction chamber) (not shown) toward the discharge port (or discharge chamber) (1511) while the orbiting scroll (140) orbits.

[0084] Then, the refrigerant is sucked into the low pressure section (110a) of the casing (110) through the refrigerant suction pipe (117), and a portion of this refrigerant is directly sucked into each suction pressure chamber (not shown) forming the compression chamber (V) and compressed, while the remaining refrigerant moves toward the drive motor (120), cools the drive motor (120), and is sucked into the suction pressure chamber (not shown) together with other refrigerants.

[0085] Then, the refrigerant is compressed while moving along the movement path of the compression chamber (V), and a portion of the compressed refrigerant moves to the back pressure chamber (160a) through the first back pressure hole (1513) and the second back pressure hole (1611) before reaching the discharge port (1511). Accordingly, the back pressure chamber (160a) forms an intermediate pressure.

[0086] Then, the floating plate (165) rises toward the high-low pressure separator (115) and comes into close contact with the high-low pressure separator (115). Accordingly, the high-pressure section (110b) of the casing (110) is separated from the low-pressure section (110a), thereby preventing the refrigerant discharged from each compression chamber (V) to the high-pressure section (110b) from flowing back to the low-pressure section (110a).

[0087] On the other hand, the back pressure plate (161) is lowered by pressure in the direction toward the non-orbiting scroll (150) due to the pressure of the back pressure chamber (160a). Then, the non-orbiting scroll (150) is pressed toward the orbiting scroll (140). Accordingly, as the non-orbiting scroll (150) is brought into close contact with the orbiting scroll (140), the refrigerant in the compression chambers (V) on both sides can be prevented from leaking from the high-pressure side compression chamber forming the intermediate pressure chamber to the low-pressure side compression chamber.

[0088] Then, the refrigerant is compressed to the set pressure while moving from the intermediate pressure chamber toward the discharge pressure chamber, and this refrigerant is discharged to the high pressure section (110b) through the discharge port (1511) provided in the non-rotating scroll (150) and the intermediate discharge port (1612) provided in the back pressure plate (161).

[0089] Meanwhile, the pressure of the refrigerant may rise above the preset pressure due to various conditions occurring during the operation of the compressor. Then, a portion of the refrigerant moving from the intermediate pressure chamber to the discharge pressure chamber is bypassed in advance from the intermediate pressure chamber forming each compression chamber (V) to the high pressure section (110b) through each bypass hole (1512) before reaching the discharge pressure chamber, repeating a series of processes.

[0090] At this time, as described above, the orbiting scroll (140) is interlocked with the non-orbiting scroll (150) to form a compression chamber (V), and thus the orbiting scroll (140) is pushed toward the main frame (130) by the pressure of the compression chamber (V). However, a scroll support surface (1321a) is formed on the upper surface of the main frame (130) facing the orbiting scroll (140), thereby forming a thrust surface (not shown) between the main frame (130) and the orbiting scroll (140). Accordingly, the width of the scroll support surface (1321a) formed on the main frame (130) has a significant effect on the stability of the orbiting scroll (140). In other words, it is advantageous in terms of the stability of the orbiting scroll (140) for the scroll support surface (1321a) of the main frame (130) to be formed as wide as possible.

[0091] However, in the case where an Oldham ring (170), which is a rotation prevention member, is provided between the main frame (130) and the orbiting scroll (140), as in a conventional scroll compressor, the area of ​​the scroll support surface (1321a) is limited due to the Oldham ring (170), making it difficult to sufficiently secure a thrust surface, and as a result, the axial support force for the orbiting scroll (140) is reduced, which may deteriorate the stability of the orbiting scroll (140).

[0092] Accordingly, in the present embodiment, the Oldham ring (170) may be provided inside the main frame (130) to form a wide scroll support surface (1321a) of the main frame (130). In other words, in the present embodiment, the main frame (130) may be divided into a plurality of main frames (130) spaced apart in the axial direction, and the Oldham ring (170) may be provided between the plurality of main frames (130). By excluding the Oldham ring (170) between the main frame (130) and the orbiting scroll (140), the scroll support surface (1321a) of the main frame (130) may be secured as wide as possible.

[0093] Fig. 4 is a perspective view showing the disassembled mainframe, Fig. 5 is a perspective view showing the assembled mainframe of Fig. 4, Fig. 6 is a plan view of Fig. 5, and Fig. 7 is a cross-sectional view taken along line "Ⅶ-Ⅶ" of Fig. 6.

[0094] Referring to FIGS. 4 to 7, the main frame (130) according to the present embodiment may include a first main frame (131) and a second main frame (132). The first main frame (131) is a member that supports a rotation shaft in a radial direction, and the second main frame (132) is a member that supports an orbiting scroll (140) in an axial direction. The first main frame (131) and the second main frame (132) may be coupled to each other, or may be provided independently of each other. The present embodiment will be described with a focus on an example in which the first main frame (131) and the second main frame (132) are coupled to each other.

[0095] Referring to FIGS. 4 and 5, the first main frame (131) according to the present embodiment may include a main flange portion (1311), a main bearing portion (1312), a pivot space portion (1313), an old ring receiving portion (1314), a frame fixing portion (1315), and a frame support protrusion (1316).

[0096] The main flange portion (1311) is formed in an annular shape and can be accommodated in the low pressure portion (110a) of the casing (110). For example, the outer diameter of the main flange portion (1311) is formed to be smaller than the inner diameter of the cylindrical shell (111), so that the outer surface of the main flange portion (1311) can be spaced apart from the inner surface of the cylindrical shell (111). However, a frame fixing portion (1315) may protrude radially from the outer surface of the main flange portion (1311), and the outer surface of the frame fixing portion (1315) may be fixedly attached to the inner surface of the casing (110). Accordingly, the first main frame (131) can be fixedly coupled to the casing (110).

[0097] The main bearing portion (1312) protrudes downward from the central lower surface of the main flange portion (1311) toward the driving motor (120), and a cylindrical shaft hole (132a) may be formed axially through the center of the main bearing portion (1312). Accordingly, the main bearing portion (1312) can radially support the rotation shaft (125) inserted into the shaft hole (132a).

[0098] Referring to FIGS. 6 and 7, the pivot space portion (1313) may be formed in an annular shape by being sunken to a preset depth from the center of the main flange portion (1311) toward the main bearing portion (1312). For example, the inner diameter (D31) of the pivot space portion (1313) may be formed smaller than the inner diameter (D4) of the boss receiving portion (1322) forming the inner diameter of the second main frame (132) to be described later, and the outer diameter (D32) of the pivot space portion (1313) may be formed larger than the inner diameter (D4) of the boss receiving portion (1322).

[0099] In other words, the pivot space (1313) may overlap at least a portion of the boss receiving portion (1322) to be described later when projected axially. For example, the radius (D321) of the pivot space (1313) may be formed to be larger than the radius of rotation (D5) of the balance weight (127) coupled to the rotation shaft (125). Accordingly, the balance weight (127) may be received inside the pivot space (1313) and rotate, thereby scattering oil flowing into the interior of the pivot space (1313). Through this, the oil of the pivot space (1313) may be smoothly supplied to the friction surface, including the thrust surface, between the main frame (130) and the pivot scroll (140).

[0100] The Oldham ring receiving portion (1314) may be formed in an annular shape on the outer circumference of the pivot space portion (1313) on the upper surface of the main flange portion (1311). A first key groove (1314a) may be formed in the Oldham ring receiving portion by being radially recessed so that a first key (172) of an Oldham ring (170), which will be described later, may be slidably inserted therein. Accordingly, the Oldham ring (170) may be inserted into the Oldham ring receiving portion (1314) and slidably received therein.

[0101] The frame fixing member (1315) may extend radially from the outer periphery of the old ring receiving member (1314). For example, the frame fixing member (1315) may extend in an annular shape or may extend as a plurality of protrusions spaced apart at predetermined intervals along the circumferential direction. In the present embodiment, an example in which the frame fixing member (1315) is formed as a plurality of protrusions along the circumferential direction is illustrated.

[0102] The outer diameter of the frame fixing member (1315) can be formed to be the same as the inner diameter of the cylindrical shell (111). Accordingly, the outer circumference of the frame fixing member (1315) can be fixed by welding or hot pressing in close contact with the inner circumference of the cylindrical shell (111).

[0103] Referring to FIGS. 4 to 7, the frame support protrusion (1316) may be formed to extend axially from one side of the frame fixing portion (1315), that is, from the upper surface of the frame fixing portion (1315) facing the guide protrusion (154) of the non-rotating scroll (150), toward the guide protrusion (154). Accordingly, the frame support protrusion (1316) may be inserted into the frame support groove (1323) of the second main frame (132), which will be described later, to increase the bonding force between the first main frame (131) and the second main frame (132).

[0104] The frame support protrusion (1316) may be formed on only one frame fixing part (1315), or may be formed on each frame fixing part (1315). This embodiment illustrates an example in which the frame support protrusion (1316) is formed on each of a plurality of frame fixing parts (1315). Accordingly, the plurality of frame support protrusions (1316) may be inserted into each of the plurality of frame support grooves (1323), thereby further increasing the bonding strength between the first main frame (131) and the second main frame (132).

[0105] The height (H1) of the frame support protrusion (1316) may be formed to be equal to or smaller than the thickness of the second main frame (132) to be described later, that is, the thickness (H2) of the scroll support member (1321) to be described later. For example, the height (H1) of the frame support protrusion (1316) may be formed to be equal to the thickness (H2) of the scroll support member (1321) to be described later. Accordingly, the orbiting scroll (140) may be supported by axial contact with the second main frame (132) while the second main frame (132) is in close contact with the first main frame (131). Through this, the orbiting scroll (140) may be stably supported by the second main frame (132) coupled to the first main frame (131).

[0106] The frame support protrusion (1316) may be formed with the guide groove (1316a) described above. The guide groove (1316a) may be formed by penetrating axially along the same axis as the guide hole (1541) provided in the guide protrusion (154) of the non-orbiting scroll (150) or by being sunken to a preset depth. Accordingly, the non-orbiting scroll (150) and the first main frame (131) may be circumferentially restrained by the respective guide members (155) coupled along the guide hole (1541) and the guide groove (1316a).

[0107] Referring to FIGS. 4 to 6, the second main frame (132) according to the present embodiment may include a scroll support portion (1321), a boss receiving portion (1322), a frame support groove portion (1323), and a key receiving portion (1324). The scroll support portion (1321) is a portion where the pivot plate portion (141) is axially supported, the boss receiving portion (1322) is a portion where the rotation shaft coupling portion (143) is rotatably received, the frame support groove portion (1323) is a portion where the frame support protrusion (1316) of the first main frame (131) is inserted, and the key receiving portion (1324) is a portion where the second key (173) of the old ring (170) described later passes through.

[0108] The scroll support member (1321) may be formed so that both axial sides are flat. In other words, the scroll support member (1321) may be formed in a flat plate shape having the same thickness overall. Accordingly, one side (upper side) of the scroll support member (1321) facing the orbiting scroll (140) forms a scroll support surface (1321a) by supporting the orbiting plate (141) of the orbiting scroll (140) in the axial direction, while the other side (lower side) of the scroll support member (1321) facing the first main frame (131) may be spaced apart from the Oldham ring receiving part (1314) of the first main frame (131) so that the ring body (171) of the Oldham ring (170), which will be described later, is received in the Oldham ring receiving part (1314).

[0109] In addition, it may be advantageous in terms of the stability of the orbiting scroll (140) to form the scroll support portion (1321) as large as possible. For example, the scroll support portion (1321) may be formed so that at least a portion of the Oldham ring receiving portion (1314) of the first main frame (131) and the ring body (171) of the Oldham ring (170) received in the Oldham ring receiving portion (1314) overlap in the axial direction. In other words, the outer diameter (D6) of the scroll support portion (1321) forming the scroll support surface (1321a) may be formed larger than the inner diameter (D7) of the Oldham ring receiving portion (1314) and / or the inner diameter of the ring body (171) of the Oldham ring (170). Accordingly, while providing an anti-rotation member, an old ring (170), between the main frame (130) and the orbiting scroll (140), the scroll support surface (1321a) of the second main frame (132) can be formed as wide as possible to increase the stability of the orbiting scroll (140).

[0110] The boss receiving portion (1322) may be formed at the center of the scroll support portion (1321). In other words, the boss receiving portion (1322) may be formed to axially penetrate the center of the scroll support portion (1321) so that the rotational shaft coupling portion (143) of the rotary scroll (140) can be rotatably received.

[0111] In this case, the radius of the boss receiving portion (1322) may be formed to be greater than or equal to the turning radius of the rotary shaft coupling portion (143). Accordingly, when the rotary shaft coupling portion (143) turns, an empty space is formed between the outer surface of the rotary shaft coupling portion (143) and the inner surface of the boss receiving portion (1322), and oil flying from the inside of the turning space portion (1313) can be supplied to the thrust surface between the second main frame (132) and the turning scroll (140) through the empty space between the rotary shaft coupling portion (143) and the boss receiving portion (1322). Through this, the scroll support surface (1321a) of the main frame (130) can be expanded while oil is stably supplied to the thrust surface between the main frame (130) and the orbiting scroll (140), thereby suppressing friction loss between the main frame (130) and the orbiting scroll (140).

[0112] In addition, the inner diameter (D4) of the boss receiving portion (1322) can be formed smaller than the outer diameter (D32) of the pivot space portion (1313) of the first main frame (131). Accordingly, the inner diameter of the scroll support surface (1321a) of the second main frame (132) can be formed as small as possible, while the area of ​​the scroll support surface (1321a) can be secured as wide as possible, thereby supporting the pivot scroll (140) more stably.

[0113] The frame support groove (1323) may be formed to be radially recessed on the outer surface of the scroll support groove (1321). Only one frame support groove (1323) may be formed, or multiple frame support grooves (1323) may be formed at predetermined intervals along the circumferential direction. In the present embodiment, an example in which multiple frame support grooves (1323) are formed at predetermined intervals along the circumferential direction is illustrated.

[0114] In other words, the frame support groove (1323) according to the present embodiment can be formed to correspond to the frame support protrusion (1316) of the first main frame (131) described above. For example, the frame support groove (1323) can be formed to be radially recessed on the outer surface of the scroll support portion (1321), but can be formed in an arc shape that penetrates the axial direction and extends in the circumferential direction. In this case, the arc length of the frame support groove (1323) can be formed to be almost the same as the arc length of the frame support protrusion (1316). Accordingly, when the frame support groove (1323) is inserted into the frame support protrusion (1316), its two side surfaces and inner surface are in close contact with the two side surfaces and inner surface of the frame support protrusion (1316), respectively, so that the second main frame (132) can be restrained in the circumferential and radial directions with respect to the first main frame (131). Through this, the number of fastening members (not shown) for fastening the first main frame (131) and the second main frame (132) can be minimized, or the first main frame (131) and the second main frame (132) can be firmly fixed while excluding the fastening members (132).

[0115] Although not shown in the drawing, the frame support groove (1323) may be formed to be recessed in the lower surface of the scroll support groove (1321) in the axial direction by a preset depth. In this case, a guide hole (not shown) penetrating along the same axial line as the guide hole (1541) of the non-orbiting scroll (150) may be formed in the frame support groove (1323). In addition, in this case, the second main frame (132) may be restrained not only in the radial and circumferential directions but also in the axial direction with respect to the first main frame (131). Accordingly, the first main frame (131) and the second main frame (132) are more firmly coupled, thereby supporting the orbiting scroll (140) more stably.

[0116] The key receiving portion (1324) can be formed to penetrate in the axial direction so as to receive the second key (173) of the old ring (170) to be described later. Accordingly, the second key (173) of the old ring (170) to be described later can pass through the scroll support portion (1321) via the key receiving portion (1324) and be slidably coupled to the second key groove (141a) of the pivoting scroll (140).

[0117] In this case, the key receiving portion (1324) may be formed in the shape of a hole that penetrates axially from the inner side of the outer surface of the scroll support portion (1321). Accordingly, as the scroll support surface (1321a) is formed on the radially outer side of the key receiving portion (1324), the thrust surface between the main frame (130) and the orbiting scroll (140) is widened accordingly, thereby supporting the orbiting scroll (140) more stably.

[0118] Also, in this case, the key receiving portion (1324) may be formed to be long in a direction perpendicular to the longitudinal direction of the second key (173) of the Oldham ring (170) to be described later, that is, the direction in which the second key (173) slides with respect to the turning scroll (140). For example, the key receiving portion (1324) may be formed in a rectangular shape that is long in the longitudinal direction of the first key (172) of the Oldham ring (170) to be described later, that is, the direction in which the ring body (171) of the Oldham ring (170) slides with respect to the first main frame (131). Accordingly, in a state in which the second main frame (132) is fixed to the first main frame (131), the Oldham ring (170) can slide with respect to the first main frame (131) in the longitudinal direction of the first key (172).

[0119] Meanwhile, the old ring (170) according to the present embodiment may include a ring body (171), a first key (172), and a second key (173). The ring body (171) is accommodated in the old ring accommodation portion (1314) of the first main frame (131) and is provided between the first main frame (131) and the second main frame (132), the first key (172) may be slidably inserted into the first key groove (1314a) of the first main frame (131), and the second key (173) may be slidably inserted into the second key groove (141a) of the orbiting scroll (140).

[0120] The ring body (171) is formed in an annular shape, and the first key (172) can extend in a first axial direction from the first side, which is one side of the ring body (171), toward the first main frame (131), and the second key (173) can extend in a second axial direction from the second side, which is the other side of the ring body (171), toward the orbiting scroll (140). Accordingly, the first key (172) and the second key (173) can extend in different axial directions from both sides of the ring body (171), so that the first key (172) can be slidably inserted into the first key groove (1314a) of the first main frame (131), and the second key (173) can be slidably inserted into the second key groove (141a) of the orbiting scroll (140), respectively. The ring body (171), the first key (172) and the second key (173) are the same as a conventional old ring, so a detailed description thereof is omitted.

[0121] As described above, when the main frame (130) is separated into the first main frame (131) and the second main frame (132), and the ring body (171) of the old ring (170) is accommodated between the first main frame (131) and the second main frame (132), the ring body (171) is covered by the second main frame (132) and does not come into direct contact with the rotating scroll (140).

[0122] Then, when the maximum outer diameter of the second main frame (132) is formed to be larger than the minimum inner diameter of the Oldham ring (170), the area of ​​the thrust surface formed between the second main frame (132) and the orbiting scroll (140) can be expanded. Accordingly, the actual area of ​​the scroll support surface (1321a) of the main frame (130) that axially supports the orbiting scroll (140) can be expanded without expanding the outer diameter of the first main frame (131) that contacts the inner surface of the casing (110). Through this, the behavior of the orbiting scroll (140) can be supported more stably under the condition that the outer diameter of the compressor is the same, thereby suppressing leakage between compression chambers (V), thereby increasing the compression efficiency of the scroll compressor.

[0123] Meanwhile, there are other examples for mainframes:

[0124] That is, in the embodiment described above, the key receiving portion of the second main frame is formed in a hole shape penetrating the scroll support portion, but in some cases, the key receiving portion may be formed in a groove shape.

[0125] Fig. 8 is an exploded perspective view showing another embodiment of the mainframe, and Fig. 9 is an assembly plan view of Fig. 8.

[0126] Referring to FIGS. 8 and 9, the basic configuration of the main frame (130), the rotating scroll, and the old ring (170) in the scroll compressor according to the present embodiment and the corresponding operational effects are almost identical to those of the above-described embodiment. For example, the main frame (130) is divided into a first main frame (131) and a second main frame (132), and the ring body (171) of the Oldham ring (170) is accommodated between the first main frame (131) and the second main frame (132), the first key (172) of the Oldham ring (170) can be slidably inserted into the first key groove (1314a) of the first main frame (131), and the second key (173) of the Oldham ring (170) can be slidably inserted into the second key groove (141a) of the orbiting scroll (140) by passing through the shaft receiving portion (1324) of the second main frame (132). Accordingly, the area of ​​the scroll support surface (1321a) that axially supports the orbiting scroll (140) can be expanded without expanding the outer diameter of the first main frame (131) that contacts the inner surface of the casing (110), thereby stably supporting the orbiting scroll (140). Through this, leakage between compression chambers (V) can be suppressed, thereby increasing the compression efficiency.

[0127] However, in the present embodiment, the key receiving portion (1324) of the second main frame (132) through which the second key (173) of the old ring (170) passes may be formed to be recessed in the radial direction by a preset depth in the outer surface of the second main frame (132), that is, in the outer surface of the scroll support portion (1321). For example, a plurality of frame support grooves (1323) may be formed in the outer surface of the second main frame (132), and a key receiving portion (1324) having an open outer surface may be formed between two frame support grooves (1323) that are adjacent in the circumferential direction among the plurality of frame support grooves (1323).

[0128] In this case, the radial depth of the key receiving portion (1324) may be formed to be smaller than or equal to the radial length of the second key (173). For example, the frame support groove (1323) and the key receiving portion (1324) may be connected in a straight line. In this case, not only can the key receiving portion (1324) be easily formed compared to the embodiment of FIG. 4 described above, but the weight of the second main plate (132) may be reduced as the outer circumference of the key receiving portion (1324) is opened.

[0129] Meanwhile, here is another example for the mainframe:

[0130] That is, in the embodiments described above, the first key of the Oldham ring is slidably inserted into the first key home of the first main frame, but in some cases, the first key of the Oldham ring may be slidably inserted into the first key home of the non-rotating scroll through the second main frame.

[0131] Fig. 10 is an exploded perspective view showing another embodiment of the mainframe, Fig. 11 is a perspective view showing the assembled mainframe of Fig. 10, Fig. 12 is a plan view of Fig. 11, and Fig. 13 is a cross-sectional view taken along line "XIII-XIII" of Fig. 12.

[0132] Referring to FIGS. 10 to 13, the basic configuration and the resulting operational effects of the main frame (130), the orbiting scroll (140), and the Oldham ring (170) in the scroll compressor according to the present embodiment are almost identical to those of the aforementioned embodiment. For example, the main frame (130) is separated into a first main frame (131) and a second main frame (132), and the ring body (171) of the Oldham ring (170) can be accommodated between the first main frame (131) and the second main frame (132). Accordingly, the area of ​​the scroll support surface (1321a) that axially supports the orbiting scroll (140) can be expanded without expanding the outer diameter of the first main frame (131) in contact with the inner surface of the casing (110), thereby stably supporting the orbiting scroll (140). This can improve compression efficiency by suppressing leakage between compression chambers (V).

[0133] However, in the present embodiment, the first keyway (153a) may be formed in the non-orbiting scroll (150), and the second keyway (141a) may be formed in the orbiting scroll (140). In other words, the first keyway (153a) may be formed to be radially long on the lower surface of the non-orbiting side portion (153) facing the first main frame (131). Accordingly, the first key (172) of the Oldham ring (170) may extend axially from one side of the ring body (171) toward the non-orbiting scroll (150), and the second key (173) of the Oldham ring (170) may extend axially from one side of the ring body (171) toward the orbiting scroll (140).

[0134] In this case, the second main frame (132) may be formed with a first key receiving portion (1324a) through which the first key (172) passes and a second key receiving portion (1324b) through which the second key (173) passes. Accordingly, the second main frame (132) is positioned between the orbiting scroll (and non-orbiting scroll) (140) and the old ring (170), and the first key (172) and the second key (173) of the old ring (170) may pass through the second main frame (132) and be coupled to the first key home (153a) of the non-orbiting scroll (150) and the second key home (141a) of the orbiting scroll (140), respectively.

[0135] Also, in this case, the first key receiving portion (1324a) and the second key receiving portion (1324b) are arranged to be perpendicular to each other, but since the first key home (153a) is positioned outside the second key home (141a), the first key receiving portion (1324a) may be formed to be positioned outside the second key receiving portion (1324b). For example, the first key receiving portion (1324a) may be formed to be recessed in the radial direction toward the boss receiving portion (1322) from the outer surface of the second main frame (132) by a preset depth, and the second key receiving portion (1324b) may be formed to penetrate in the axial direction at a position spaced apart from the outer surface of the second main frame (132) by a preset distance.

[0136] The first key receiving portion (1324a) may be formed to be elongated in the radial direction, that is, in the longitudinal direction of the first key (172), and the second key receiving portion (1324b) may be formed to be elongated in a direction perpendicular to the radial direction, that is, in the longitudinal direction of the first key receiving portion (1324a). Accordingly, the outer diameter of the scroll support portion (1321) of the second main frame (132) may be formed as large as possible to secure a wide scroll support surface (1321a) of the second main frame (132).

[0137] Although not illustrated in the drawing, the first key receiving portion (1324a) may be formed in a hole shape. In other words, the first key receiving portion (1324a) may be formed by penetrating axially at a position spaced apart from the outer surface of the scroll support portion (1321) by a preset interval. Accordingly, the scroll support portion (1321) remains on the outer side of the first key receiving portion (1324a), thereby increasing the area of ​​the scroll support surface (1321a).

[0138] Also, although not shown in the drawing, the second key receiving portion (1324b) may be formed in a radially recessed groove shape on the outer surface of the second main frame (132) as in the embodiment of FIG. 8. In this case, the second key receiving portion (1324b) can be easily formed while reducing the size of the second main frame (132) and thus reducing its weight.

[0139] Meanwhile, in the above-described embodiments, the frame support protrusion (1316) is described with an example in which the frame support groove (1323) is formed in the first main frame (131) and the frame support groove (1323) is formed in the second main frame (132), respectively. However, in some cases, the frame support protrusion (not shown) may be formed in the second main frame (132) and the frame support groove (not shown) may be formed in the first main frame (131), respectively. In this case, the basic configuration and operational effects of the frame support protrusion and the frame support groove are almost the same as in the above-described embodiments, so the description of the above-described embodiments will be replaced with the description of the above-described embodiments. However, in this case, the guide member may pass through the guide hole of the guide protrusion and be coupled between the frame support grooves of the first main frame, respectively.

Claims

1. Casing; A rotary scroll that is coupled to a rotating shaft in the internal space of the above casing and performs a rotary motion; A non-orbiting scroll that is interlocked with the above-mentioned orbiting scroll to form a compression chamber; A first main frame fixed to the inner space of the above casing; A second main frame provided between the first main frame and the orbiting scroll and supporting the orbiting scroll; and It includes a rotation prevention member that is provided between the first main frame and the second main frame and suppresses the rotation of the rotating scroll, The above second mainframe is, A scroll compressor in which the anti-rotation member and the rotating shaft overlap in the axial direction.

2. In paragraph 1, The above anti-lock member is, A ring body provided between the first main frame and the second main frame; A first key extending from the first side of the ring body and slidably coupled to the first main frame; and A second key extending from the second side of the ring body and slidably coupled to the rotating scroll is included. The above second key is, A scroll compressor that is slidably connected to the orbiting scroll through the second main frame.

3. In paragraph 2, A first key home is formed in the first main frame into which the first key is slidably inserted, and a second key home is formed in the rotary scroll into which the second key is slidably inserted. A scroll compressor in which a key receiving portion is formed in the second main frame so that the second key passes through in the axial direction of the rotation shaft.

4. In paragraph 3, The above key receiving part is, A scroll compressor formed in the shape of a hole spaced apart in the radial direction of the rotation axis on the outer surface of the second main frame.

5. In paragraph 3, The above key receiving part is, A scroll compressor formed in a groove shape by being sunken in the radial direction of the rotation axis on the outer surface of the second main frame.

6. In paragraph 1, The above anti-lock member is, A ring body provided between the first main frame and the second main frame; A first key extending from the second side of the ring body and slidably coupled to the non-rotating scroll; and A second key extending from the second side of the ring body and slidably coupled to the rotating scroll is included. The first and second keys, A scroll compressor that is slidably connected to the non-orbiting scroll and the orbiting scroll, respectively, by passing through the second main frame.

7. In paragraph 6, A first key home is formed in the first main frame into which the first key is slidably inserted, and a second key home is formed in the rotary scroll into which the second key is slidably inserted. A scroll compressor in which a first key receiving portion is formed in the second main frame so that the first key passes through, and a second key receiving portion is formed between the circumferences of the first key receiving portions so that the second key passes through.

8. In paragraph 7, At least one of the first key receiving portion and the second key receiving portion, A scroll compressor formed in the shape of a hole spaced apart in the radial direction of the rotation axis on the outer surface of the second main frame.

9. In paragraph 7, At least one of the first key receiving portion and the second key receiving portion, A scroll compressor formed in a groove shape by being sunken in the radial direction of the rotation axis on the outer surface of the second main frame.

10. In paragraph 1, At the center of the first main frame, an axle hole is formed into which the rotation shaft is inserted, and a rotating space is formed around the axle hole to be sunken to a preset depth. In the above rotating space, A scroll compressor having a balance weight coupled to the above-mentioned rotating shaft.

11. In paragraph 10, In the center of the second main frame, a boss receiving portion is formed into which a rotation shaft coupling portion, which is connected to the rotation shaft of the rotary scroll, is rotatably inserted. The above rotating space section is, A scroll compressor formed so that at least a portion thereof overlaps the boss receiving portion and the rotating shaft in the axial direction.

12. In any one of paragraphs 1 to 11, A scroll compressor in which a frame support projection extending toward the opposite mainframe is formed on one of the first mainframe and the second mainframe, and a frame support groove is formed on the other mainframe so that the frame support projection is inserted.

13. In paragraph 12, The above frame support projection extends toward the non-orbiting scroll from one side of the first main frame facing the non-orbiting scroll, and the frame support groove is recessed in the radial direction of the rotation axis on the outer surface of the second main frame. The above frame support protrusion and the above frame support groove are, A scroll compressor formed so that at least some of the scrolls overlap each other in the circumferential direction.

14. In paragraph 13, A back pressure chamber assembly is provided on the back surface of the above non-orbiting scroll, and a back pressure chamber connected to the compression chamber is formed in the back pressure chamber assembly, and a guide member is slidably coupled to the above non-orbiting scroll. The above guide member, A scroll compressor supported on the end face of the above frame support protrusion.

15. In paragraph 14, The height of the above frame support protrusion is A scroll compressor formed to have a thickness equal to or smaller than that of the second main frame.

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