Scroll compressor

Abstract

This scroll compressor comprises: a casing; a main frame which is fixed to the inside of the casing and which has an accommodation groove formed on the upper surface thereof; a fixed scroll provided on the upper surface of the main frame; an orbiting scroll provided in the accommodation recess of the main frame, and engaged with the fixed scroll so as to form a compression chamber; an axially compliant frame which is provided at the lower side of the orbiting scroll in the accommodation recess of the main frame so as to be movable vertically, and which divides the accommodation recess into a first back pressure chamber and a second back pressure chamber; a driving shaft which is coupled to the lower portion of the orbiting scroll and which causes the orbiting scroll to orbit; and a driving motor which is provided at the lower side of the main frame, and which rotates the driving shaft.

Description

scroll compressor

[0001] The present disclosure relates to a scroll compressor, and more particularly, to a scroll compressor including a back pressure chamber.

[0002] A compressor is a mechanical device that uses a motor or turbine to compress air, refrigerant, or other working gases to increase their pressure. Compressors are widely used across industries.

[0003] When a compressor is used in a refrigerant cycle, it can convert low pressure refrigerant into high pressure refrigerant and then deliver it to the condenser.

[0004] Compressors can be broadly classified into reciprocating compressors that form a compression space between a piston and a cylinder where a working gas is sucked in and discharged, and compress the refrigerant as the piston reciprocates linearly inside the cylinder; rotary compressors that form a compression space between an eccentrically rotating rolling piston and a cylinder where a working gas is sucked in and discharged, and compress the refrigerant as the rolling piston rotates eccentrically along the inner wall of the cylinder; and scroll compressors that form a compression space between an orbiting scroll and a fixed scroll where a working gas is sucked in and discharged, and compress the refrigerant as the orbiting scroll rotates relative to the fixed scroll.

[0005] Scroll compressors are widely used in refrigeration cycle devices because they are more efficient, have less vibration and noise, and are compact and lightweight compared to reciprocating compressors or rotary compressors.

[0006] A scroll compressor according to one or more embodiments of the present disclosure may include: a casing; a main frame fixed to the inside of the casing and having a receiving groove formed on an upper surface; a fixed scroll installed on an upper surface of the main frame; an orbiting scroll installed in the receiving groove of the main frame and meshing with the fixed scroll to form a compression chamber; an axially compliant frame installed in the receiving groove of the main frame so as to be able to move up and down on a lower side of the orbiting scroll and formed to divide the receiving groove into a first back pressure chamber and a second back pressure chamber; a drive shaft coupled to a lower portion of the orbiting scroll and rotating the orbiting scroll; and a drive motor installed on a lower side of the main frame and rotating the drive shaft.

[0007] According to one or more embodiments of the present disclosure, the first back pressure chamber may be located on the inside of the axially compliant frame. The second back pressure chamber may be located on the outside of the axially compliant frame.

[0008] According to one or more embodiments of the present disclosure, the first back pressure chamber and the second back pressure chamber can be separated by a first seal installed between the upper surface of the axially compliant frame and the lower surface of the orbiting scroll and a second seal installed between the outer surface of the axially compliant frame and the main frame.

[0009] According to one or more embodiments of the present disclosure, the axially compliant frame may include a first seal formed on an upper surface of the axially compliant frame to receive the first seal; and a second seal formed on an outer peripheral surface of the axially compliant frame to receive the second seal.

[0010] According to one or more embodiments of the present disclosure, the first seal may have a height of an inner wall in contact with the first back pressure chamber lower than a height of an outer wall in contact with the second back pressure chamber.

[0011] According to one or more embodiments of the present disclosure, the first seal may have a height of an outer wall in contact with the second back pressure chamber lower than a height of an inner wall in contact with the first back pressure chamber.

[0012] According to one or more embodiments of the present disclosure, the orbiting scroll may include a first intermediate pressure passage connecting the compression chamber and the first back pressure chamber; and a second intermediate pressure passage connecting the compression chamber and the second back pressure chamber.

[0013] According to one or more embodiments of the present disclosure, the first intermediate pressure passage may be formed to communicate the upper surface and the lower surface of the rotating scroll.

[0014] According to one or more embodiments of the present disclosure, the second intermediate pressure passage may be formed to communicate the upper surface and the side surface of the rotating scroll.

[0015] According to one or more embodiments of the present disclosure, the receiving groove of the main frame may further include an Oldham ring installed at the lower portion of the rotating scroll. The Oldham ring may be installed on the outer side of the axially compliant frame.

[0016] According to one or more embodiments of the present disclosure, the pressure in the first back pressure chamber may be greater than the pressure in the second back pressure chamber.

[0017] According to one or more embodiments of the present disclosure, the axially compliant frame may include an upper sleeve formed in a hollow cylindrical shape; and a lower sleeve formed in a hollow cylindrical shape extending from a lower surface of the upper sleeve and having an outer diameter smaller than that of the upper sleeve and an inner diameter equal to that of the upper sleeve. A first seal may be formed on an upper surface of the upper sleeve, and a second seal may be formed on an outer peripheral surface of the lower sleeve.

[0018] According to one or more embodiments of the present disclosure, the first back pressure chamber may be formed as a space between the orbiting scroll and the inner surface of the axially compliant frame. The second back pressure chamber may be formed as a space between the orbiting scroll, the receiving groove of the main frame, and the outer surface of the axially compliant frame.

[0019] According to one or more embodiments of the present disclosure, the receiving groove of the main frame may include: an upper receiving groove in which the upper sleeve is received; and a lower receiving groove formed on a bottom surface of the upper receiving groove to have a diameter smaller than the upper receiving groove and in which the lower sleeve is received.

[0020] According to one or more embodiments of the present disclosure, a lower seal may be installed between the lower surface of the pivot scroll and the bottom surface of the receiving groove of the main frame.

[0021] The above-described and other aspects, features, and advantages of the embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings. In the accompanying drawings:

[0022] FIG. 1 is a perspective view illustrating a scroll compressor according to one or more embodiments of the present disclosure.

[0023] FIG. 2 is a cross-sectional view showing a scroll compressor according to one or more embodiments of the present disclosure.

[0024] Fig. 3 is an enlarged cross-sectional view showing the upper part of the scroll compressor of Fig. 2.

[0025] FIG. 4 is an exploded perspective view showing major parts of a scroll compressor according to one or more embodiments of the present disclosure.

[0026] FIG. 5 is a bottom perspective view showing a rotating scroll of a scroll compressor according to one or more embodiments of the present disclosure.

[0027] FIG. 6 is a perspective view showing an axially compliant frame of a scroll compressor according to one or more embodiments of the present disclosure.

[0028] Fig. 7 is an enlarged cross-sectional view showing part A of Fig. 3.

[0029] FIG. 8 is a partial cross-sectional view showing a rotating scroll and an axially compliant frame of a scroll compressor according to one or more embodiments of the present disclosure.

[0030] Fig. 9 is a drawing showing the pressure distribution of a rotating scroll of a scroll compressor according to the prior art.

[0031] FIG. 10 is a drawing showing the pressure distribution of a rotating scroll of a scroll compressor according to one or more embodiments of the present disclosure.

[0032] Fig. 11 is a partial cross-sectional view showing a back pressure chamber of a scroll compressor according to the prior art.

[0033] It should be understood that the various embodiments and terms used in this document are not intended to limit the technical features described in this document to specific embodiments, but rather include various modifications, equivalents, or alternatives of the embodiments.

[0034] In connection with the description of the drawings, similar reference numerals may be used for similar or related components.

[0035] The singular form of a noun corresponding to an item may include one or more of said items, unless the relevant context clearly indicates otherwise.

[0036] In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" may include any one of the items listed together in that phrase, or all possible combinations thereof.

[0037] The term "and / or" includes any combination of a plurality of related described elements or any one of a plurality of related described elements.

[0038] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish one component from another and do not qualify the components in any other respect (e.g., importance or order).

[0039] When a component (e.g., a first component) is referred to as being "coupled" or "connected" to another component (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0040] The terms "include" or "have" are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in this document, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0041] When a component is said to be “connected,” “coupled,” “supported,” or “in contact with” another component, this includes not only cases where the components are directly connected, coupled, supported, or in contact, but also cases where the components are indirectly connected, coupled, supported, or in contact through a third component.

[0042] When we say that a component is "on" another component, this includes not only cases where the component is in contact with the other component, but also cases where there is another component between the two components.

[0043] In addition, terms such as 'front end', 'rear end', 'upper end', 'lower end', 'top end', and 'bottom end' used in the present disclosure are defined based on the drawings, and the shape and position of each component are not limited by these terms.

[0044] The present disclosure relates to a scroll compressor capable of reducing friction loss and axial refrigerant leakage.

[0045] Hereinafter, a scroll compressor (1) according to one or more embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0046] FIG. 1 is a perspective view illustrating a scroll compressor (1) according to one or more embodiments of the present disclosure. FIG. 2 is a cross-sectional view illustrating a scroll compressor (1) according to one or more embodiments of the present disclosure. FIG. 3 is an enlarged cross-sectional view illustrating the upper portion of the scroll compressor (1) of FIG. 2. FIG. 4 is an exploded perspective view illustrating a main part of a scroll compressor (1) according to one or more embodiments of the present disclosure. FIG. 5 is a bottom perspective view illustrating an orbiting scroll (50) of a scroll compressor (1) according to one or more embodiments of the present disclosure.

[0047] Referring to FIGS. 1 to 4, a scroll compressor (1) according to one embodiment of the present invention may include a casing (10), a main frame (20), a sub-frame (30), a fixed scroll (40), a rotating scroll (50), an axially compliant frame (60), and a driving motor (80).

[0048] The casing (10) is a cylindrical sealed container and may include an upper casing (11) and a lower casing (12). A main frame (20), a sub-frame (30), a fixed scroll (40), a rotating scroll (50), an axially compliant frame (60), and a driving motor (80) may be accommodated inside the casing (10).

[0049] A refrigerant inlet pipe (13) through which refrigerant is introduced and a refrigerant discharge pipe (15) through which refrigerant is discharged can be installed in the casing (10).

[0050] The refrigerant inlet pipe (13) passes through the casing (10), and one end of it is connected to the fixed scroll (40). The refrigerant discharge pipe (15) passes through the casing (10), and one end of it can be connected to the inside of the casing (10).

[0051] Accordingly, the refrigerant is introduced into the fixed scroll (40) installed in the casing (10) through the refrigerant inlet pipe (13), and the compressed refrigerant discharged from the fixed scroll (40) can be discharged outside the casing (10) through the refrigerant discharge pipe (15).

[0052] A base (18) supporting the casing (10) may be provided at the bottom of the lower casing (12). The scroll compressor (1) may be installed vertically to the support surface by the base (18).

[0053] The main frame (20) and the sub-frame (30) are spaced apart from each other vertically at a certain distance and are each fixed inside the casing (10). A driving motor (80) that rotates the rotary scroll (50) is installed between the main frame (20) and the sub-frame (30).

[0054] A fixed scroll (40) and a rotating scroll (50) may be installed on the upper side of the main frame (20). A reservoir (15) storing oil or lubricant for lubricating and cooling the parts accommodated inside the casing (10) may be provided on the lower side of the casing (10) below the subframe (30).

[0055] The main frame (20) may be formed in a roughly circular shape. A protrusion (21) may be formed on the lower surface of the main frame (20). A shaft support hole (22) may be formed in the protrusion (21) of the main frame (20), and a bearing (23) for supporting a drive shaft may be installed in the shaft support hole (22). The bearing (23) may be formed of bearing metal.

[0056] Since the drive shaft (85) is inserted so as to penetrate the bearing (23), the bearing (23) can support the rotation of the drive shaft (85).

[0057] A receiving groove (25) may be provided on the upper surface of the main frame (20). The receiving groove (25) is formed so that a rotating scroll (50) and an axially compliant frame (60) can be received. The receiving groove (25) may be formed as a groove with a circular cross-section.

[0058] The receiving groove (25) may be formed in two stages. Specifically, the receiving groove (25) may include an upper receiving groove (251) and a lower receiving groove (252).

[0059] The upper receiving groove (251) may be formed with a certain depth on the upper surface of the main frame (20). The upper receiving groove (251) may be formed to have a circular cross-section. The lower receiving groove (252) may be formed with a certain depth on the bottom surface of the upper receiving groove (251). The lower receiving groove (252) may be formed with a circular cross-section having a smaller diameter than the upper receiving groove (251). Therefore, the upper receiving groove (251) and the lower receiving groove (252) may form a step.

[0060] An Oldham ring groove in which an Oldham ring (70) is installed may be formed on the bottom surface of the upper receiving groove (251). The Oldham ring groove may be formed around the perimeter of the lower receiving groove (252).

[0061] A shaft support hole (22) may be formed on the bottom surface of the lower receiving groove (252). That is, the lower receiving groove (252) may be in communication with the shaft support hole (22) of the protrusion (21). The lower receiving groove (252) is formed to have a diameter larger than the diameter of the shaft support hole (22). The lower receiving groove (252) may be formed concentrically with the shaft support hole (22).

[0062] A lower sealing groove (26) may be formed on the bottom surface of the receiving groove (25). Specifically, the lower sealing groove (26) may be formed on the bottom surface of the lower receiving groove (252). The lower sealing groove (26) may be formed around the shaft support hole (22). The lower sealing groove (26) may be formed in a ring shape. The lower sealing groove (26) may be formed at a certain depth on the bottom surface of the lower receiving groove (252). For example, the cross section of the lower sealing groove (26) may be formed in a U-shape with a substantially flat bottom. A lower seal (73) may be installed in the lower sealing groove (26).

[0063] A plurality of fixing holes (201) may be provided on the edge of the upper surface of the main frame (20) to which a fixed scroll (40) is fixed. Specifically, the plurality of fixing holes (201) may be formed around the periphery of the upper receiving groove (251) on the upper surface of the main frame (20). Female screws may be formed on the inner surface of the plurality of fixing holes (201).

[0064] A plurality of first refrigerant passages (202) may be provided on the outer surface of the main frame (20). The plurality of first refrigerant passages (202) may be formed as grooves connecting the upper and lower surfaces of the main frame (20).

[0065] A fixed scroll (40) is installed on the upper surface of the main frame (20). The fixed scroll (40) is installed so as to cover the receiving groove (25) of the main frame (20). The fixed scroll (40) can be fixed to a plurality of fixing holes (201) formed on the upper surface of the main frame (20) with a plurality of bolts. A rotating scroll (50) and an axially compliant frame (60) can be accommodated in the space formed by the fixed scroll (40) and the main frame (20).

[0066] The orbiting scroll (50) is interlocked with the fixed scroll (40) and is installed between the fixed scroll (40) and the main frame (20) so that it can pivot relative to the fixed scroll (40). The axial compliance frame (60) can be installed below the orbiting scroll (50).

[0067] The fixed scroll (40) may include a wrap receiving portion (41), a flange (531) (44) provided around the wrap receiving portion (41), and a fixed wrap (43) provided in the internal space of the wrap receiving portion (41).

[0068] The wrap receiving portion (41) may be formed in a shape that can be accommodated inside the casing (10). The wrap receiving portion (41) is accommodated inside the casing (10) and may be formed in a roughly hollow cylindrical shape. For example, the wrap receiving portion (41) may include a cylindrical side wall and an upper plate formed to block the upper end of the side wall.

[0069] A fixed portion (44) extending outward may be provided at the lower end of the wrap receiving portion (41). The lower surface of the fixed portion (44), i.e., the surface that contacts the plate (51) of the rotating scroll (50), forms a thrust surface.

[0070] A plurality of through holes (441) for connection with the main frame (20) may be provided at the edge of the fixed part (44). Accordingly, the fixed scroll (40) may be fixed to a plurality of fixing holes (201) of the main frame (20) by a plurality of bolts inserted into the plurality of through holes (441) of the fixed part (44).

[0071] In addition, a plurality of second refrigerant passages (442) may be provided at the edge of the fixed portion (44). The plurality of second refrigerant passages (442) may be formed as grooves connecting the upper surface and the lower surface of the fixed portion (44). The plurality of second refrigerant passages (442) may be formed to correspond to the plurality of first refrigerant passages (202) of the main frame (20). The refrigerant discharged to the upper side of the fixed scroll (40) through the plurality of first refrigerant passages (202) of the main frame (20) and the plurality of second refrigerant passages (442) of the fixed scroll (40) may move to the lower side of the main frame (20).

[0072] The upper plate (41a) of the wrap receiving portion (41) is formed in a circular shape, and a discharge port (45) through which refrigerant is discharged and a plurality of bypasses (49) may be provided. A check valve (451) for opening and closing the discharge port (45) and a plurality of bypass valves (491) for opening and closing the plurality of bypasses (49) may be provided on the upper surface of the upper plate (41a).

[0073] A fixed surface (41b) can be formed on the lower surface of the upper plate (41a) facing the rotating scroll (50). Accordingly, the upper end of the rotating wrap (52) of the rotating scroll (50) can contact the fixed surface (41b) of the fixed scroll (40).

[0074] A fixed wrap (43) is provided in the wrap receiving portion (41). The fixed wrap (43) extends vertically from the fixed surface (41b) of the wrap receiving portion (41) and may be formed as a spiral-shaped curved surface having a constant thickness and height. For example, the fixed wrap (43) may be formed as an involute curve, an algebraic spiral curve, a hybrid curve, etc.

[0075] A spiral-shaped space is formed in the internal space of the wrap receiving portion (41) by the fixed wrap (43). The orbiting wrap (52) of the orbiting scroll (50) is inserted into the spiral space of the wrap receiving portion (41) of the fixed scroll (40).

[0076] The discharge port (45) can be formed at the center of the wrap receiving portion (41) so as to penetrate the upper plate (41a) of the wrap receiving portion (41). In other words, the discharge port (45) can be formed adjacent to the center of the spiral space formed by the fixed wrap (43).

[0077] An inlet (46) through which refrigerant flows may be formed on the side of the fixed scroll (40). The inlet (46) may be connected to a refrigerant inlet pipe (13) installed in the casing (10). Therefore, the refrigerant flowing through the refrigerant inlet pipe (13) may be introduced into the interior of the fixed scroll (40) through the inlet (46). Specifically, the inlet (46) is formed to penetrate the side wall of the wrap receiving portion (41). The inlet (46) may be formed adjacent to the outer end of the spiral space formed in the wrap receiving portion (41). Therefore, the refrigerant may be introduced into the spiral space of the fixed scroll (40) through the inlet (46).

[0078] An oil groove (47) may be formed on the lower surface of the fixed scroll (40), i.e., the thrust surface. The oil groove (47) may be formed at a certain depth on the thrust surface. For example, the cross-section of the oil groove (47) may be formed in a U-shape with a substantially flat bottom. The oil groove (47) may be formed in an arc shape surrounding the wrap receiving portion (41).

[0079] The pivoting scroll (50) is installed at the bottom of the fixed scroll (40) so as to pivot relative to the fixed scroll (40).

[0080] Referring to FIGS. 3 to 5, the rotary scroll (50) may include a plate (51), a rotary wrap (52), and a boss (53).

[0081] The plate (51) is formed in a circular shape with a certain thickness and area, and a rotating surface can be formed on the upper surface of the plate (51) facing the fixed scroll (40).

[0082] The turning wrap (52) extends vertically from the upper surface of the plate (51), i.e., the turning surface, and can be formed in a spiral shape. The turning wrap (52) is formed so as to be able to engage with the fixed wrap (43) of the fixed scroll (40).

[0083] The turning wrap (52) can be formed as a curved surface having a certain thickness and height. For example, the turning wrap can be formed as an involute curve, an algebraic spiral curve, a hybrid curve, etc.

[0084] The fixed wrap (43) of the fixed scroll (40) and the rotating wrap (52) of the rotating scroll (50) are accommodated in the wrap receiving portion (41) of the fixed scroll (40). The internal space (42) of the wrap receiving portion (41) of the fixed scroll (40) forms a compression chamber.

[0085] The interlocked fixed wrap (43) and the rotating wrap (52) form a compression chamber, i.e., a plurality of compression pockets. When the rotating scroll (50) rotates, the plurality of compression pockets move toward the center of the wrap receiving portion (41) and compress the refrigerant introduced into the inlet (46) of the fixed scroll (40) and discharge it through the discharge port (45).

[0086] The plate (51) may include a first intermediate pressure passage (58) and a second intermediate pressure passage (59) that connect the compression chamber, the first back pressure chamber (B1), and the second back pressure chamber (B2).

[0087] The first intermediate pressure passage (58) may be formed to communicate with the compression chamber and the first back pressure chamber (B1). In other words, one end of the first intermediate pressure passage (58) is formed to communicate with one of the plurality of compression pockets, and the other end is formed to communicate with the first back pressure chamber (B1) formed between the orbiting scroll (50) and the axially compliant frame (60).

[0088] For example, the first intermediate pressure passage (58) may be formed to connect the upper and lower surfaces of the orbiting scroll (50). That is, one end of the first intermediate pressure passage (58) may be formed on the upper surface of the plate (51) of the orbiting scroll (50), and the other end may be formed on the lower surface of the plate (51). A hole connecting both ends of the first intermediate pressure passage (58) may be formed inside the plate (51).

[0089] The second intermediate pressure passage (59) may be formed to communicate with the compression chamber and the second back pressure chamber (B2). In other words, one end of the second intermediate pressure passage (59) is formed to communicate with one of the plurality of compression pockets, and the other end is formed to communicate with the second back pressure chamber (B2) formed between the rotating scroll (50) and the upper receiving groove (251) of the main frame (20) on the outside of the axial compliance frame (60).

[0090] For example, the second intermediate pressure passage (59) may be formed to connect the upper surface and the side surface of the orbiting scroll (50). That is, one end of the second intermediate pressure passage (59) may be formed on the upper surface of the plate (51) of the orbiting scroll (50), and the other end may be formed on the side surface of the plate (51). A hole connecting both ends of the second intermediate pressure passage (59) may be formed inside the plate (51).

[0091] The first intermediate pressure passage (58) may be formed to communicate with a compression pocket different from the compression pocket with which the second intermediate pressure passage (59) is communicated. The pressure of the compression pocket communicated with the first intermediate pressure passage (58) may be higher than the pressure of the compression pocket communicated with the second intermediate pressure passage (59). Therefore, the pressure of the refrigerant discharged to the first back pressure chamber (B1) through the first intermediate pressure passage (58) may be higher than the pressure of the refrigerant discharged to the second back pressure chamber (B2) through the second intermediate pressure passage (59).

[0092] The boss (53) can be formed at the center of the lower surface of the plate (51) opposite to the turning surface. The boss (53) is formed to extend downward from the lower surface of the plate (51). The boss (53) can be formed in a hollow cylindrical shape. The upper end of the driving shaft (85) can be inserted into the hole (54) of the boss (53). That is, the eccentric portion (87) provided at the upper end (87) of the driving shaft (85) is coupled to the boss (53).

[0093] A bearing (55) can be installed in the hole (54) of the boss (53). The bearing (55) can be formed of bearing metal. Therefore, when the driving shaft (85) rotates, the rotary scroll (50) can rotate.

[0094] A flange (531) may be formed at the bottom of the boss (53). The flange (531) may be formed parallel to the plate (51). The flange (531) may be formed to protrude outward from the outer peripheral surface of the boss (53). The flange (531) may be formed in an annular shape and may be formed to have a diameter smaller than the diameter of the lower receiving groove (252).

[0095] The orbiting wrap (52) of the orbiting scroll (50) is engaged with the fixed wrap (43) of the fixed scroll (40), and the boss (53) can be inserted into the receiving groove (25) of the main frame (20). Specifically, the plate (51) of the orbiting scroll (50) can be positioned in the upper receiving groove (251), and the flange (531) of the boss (53) can be positioned in the lower receiving groove (252).

[0096] Additionally, the lower surface of the plate (51) on which the boss (53) is formed can be supported by an axially compliant frame (60). Specifically, the lower surface of the plate (51) can be supported by the upper surface of the axially compliant frame (60) inserted into the boss (53).

[0097] A lower seal (73) may be installed between the flange (531) of the boss (53) and the bottom surface of the receiving groove (25). Specifically, the lower seal (73) may be installed between the bottom surface of the lower receiving groove (252) and the flange (531) of the boss (53). That is, the flange (531) of the boss (53) may be supported by the lower seal (73) installed in the lower sealing groove (26). Therefore, the boss hole (54) and the outside of the boss (53), that is, the receiving groove (25) of the main frame (20), may be separated by the lower seal (73). That is, the hole (54) of the boss (53) and the lower receiving groove (352) of the main frame (20) are not connected to each other by the lower seal (73).

[0098] The axial compliance frame (60) may be installed on the lower side of the orbiting scroll (50). The axial compliance frame (60) may be installed on the lower side of the orbiting scroll (50) in the receiving groove (25) of the main frame (20) so as to be able to move up and down with respect to the orbiting scroll (50). That is, the axial compliance frame (60) may be installed so as to move axially in the receiving groove (25) of the main frame (20). The axial compliance frame (60) may be formed so as to divide the receiving groove (25) of the main frame (20) into a first back pressure chamber (B1) and a second back pressure chamber (B2).

[0099] The axial compliance frame (60) may be formed in a hollow cylindrical shape. The axial compliance frame (60) may be inserted into the boss (53) of the rotating scroll (50). A through hole (65) may be formed in the center of the axial compliance frame (60), and the outer circumferential surface may be formed to have a step.

[0100] The first back pressure chamber (B1) may be located on the inner side of the axially compliant frame (60), and the second back pressure chamber (B2) may be located on the outer side of the axially compliant frame (60). Specifically, the first back pressure chamber (B1) may be formed as a space between the boss (53) of the orbiting scroll (50) and the axially compliant frame (60). The second back pressure chamber (B2) may be formed as a space between the inner surface of the receiving groove (25) of the main frame (20) and the orbiting scroll (50) and the axially compliant frame (60).

[0101] A first seal (71) may be installed between the axial compliance frame (60) and the orbiting scroll (50). Specifically, the first seal (71) may be installed between the upper surface of the axial compliance frame (60) and the lower surface of the plate (51) of the orbiting scroll (50). The first seal (71) may be formed of Teflon.

[0102] A second seal (72) may be installed between the axial compliance frame (60) and the main frame (20). Specifically, the second seal (72) may be installed between the outer surface of the axial compliance frame (60) and the inner surface of the lower receiving groove (252) of the main frame (20). The second seal (72) may be formed as an O-ring.

[0103] Accordingly, the first back pressure chamber (B1) and the second back pressure chamber (B2) can be separated by the first seal (71) installed between the upper surface of the axially compliant frame (60) and the lower surface of the rotating scroll (50) and the second seal (72) installed between the outer surface of the axially compliant frame (60) and the main frame (20). That is, the first back pressure chamber (B1) and the second back pressure chamber (B2) are blocked by the first seal (71) and the second seal (72) and do not communicate with each other.

[0104] The drive motor (80) may include a stator (81) and a rotor (82). The stator (81) may be fixed to the inner surface of the casing (10). The rotor (82) may be rotatably installed on the inner surface of the stator (81).

[0105] Additionally, a drive shaft (85) can be inserted through the rotor (82). Since the rotor (82) is fixed to the drive shaft (85), the rotor (82) and the drive shaft (85) can rotate as one unit.

[0106] The drive shaft (85) may include an axial portion (86) formed to have a certain length and an eccentric portion (87) formed to extend upward from the top of the axial portion (86). The central axis of the eccentric portion (87) is spaced a certain distance from the center of rotation of the drive shaft (85), i.e., the central axis of the axial portion (86).

[0107] A rotor (82) of a drive motor (80) can be fixed to the shaft portion (86) of the drive shaft (85). One end of the shaft portion (86) is inserted into the shaft support hole (22) of the protrusion (21) of the main frame (20), and can be rotatably supported by a bearing (23) installed in the shaft support hole (22).

[0108] The upper end of the drive shaft (85), i.e., the eccentric portion (87), can be inserted into the hole (54) of the boss (53) of the orbiting scroll (50). The eccentric portion (87) of the drive shaft (85) can be supported by a bearing (55) installed in the boss (53) of the orbiting scroll (50).

[0109] A balance weight (84) may be installed on the shaft portion (86) of the drive shaft (85) toward the upper side of the rotor (82). That is, the balance weight (84) may be installed on the shaft portion (86) between the rotor (82) and the main frame (20).

[0110] The lower portion of the shaft (86) can be supported by a bearing (31) installed in a sub-frame (30) fixed to the casing (10). The bearing (31) of the sub-frame (30) can be formed of bearing metal. Accordingly, the driving shaft (85) can rotate while being supported at both ends by the main frame (20) and the sub-frame (30).

[0111] In addition, the drive shaft (85) may be formed with an oil passage (88) formed to penetrate the shaft (86) and the eccentric portion (87). An outlet (88a) of the oil passage (88) is provided at the upper end of the eccentric portion (87). Accordingly, the oil that has moved through the oil passage (88) can be discharged into the hole (54) of the boss (53) of the rotating scroll (50). That is, the oil that has moved through the oil passage (88) can be discharged into the space of the hole (54) of the boss (53) on the upper side of the eccentric portion (87) of the drive shaft (85).

[0112] An oil pump (33) that supplies oil from the oil reservoir (15) to the oil path (88) can be installed at the bottom of the drive shaft (85). The bottom of the oil pump (33) can be submerged in the oil reservoir (15) of the casing (10).

[0113] Accordingly, when the drive shaft (85) rotates, the pressure applied to the oil tank (15) and the oil stored in the oil tank (15) can be supplied to the oil passage (88) of the drive shaft (85) by the oil pump (33).

[0114] Oil moving along the oil path (88) can be supplied to the hole (54) of the boss (53) of the rotating scroll (50) through the outlet (88a). In addition, a portion of the oil moving through the oil path (88) can be supplied to the bearing (23) of the main frame (20) through the side outlet of the oil path (88).

[0115] Hereinafter, the axial compliance frame (60) will be described in detail with reference to FIGS. 3 and 6.

[0116] FIG. 6 is a perspective view showing an axial compliance frame (60) of a scroll compressor according to one or more embodiments of the present disclosure.

[0117] Referring to FIGS. 3 and 6, the axial compliance frame (60) may be formed in a hollow cylindrical shape. The axial compliance frame (60) may include an upper sleeve (61) and a lower sleeve (62).

[0118] The upper sleeve (61) may be formed in a hollow cylindrical shape. The lower sleeve (62) may be formed in a hollow cylindrical shape extending from the lower surface of the upper sleeve (61) and having a smaller outer diameter than the upper sleeve (61). The lower sleeve (62) may be formed in a hollow cylindrical shape having the same inner diameter as the hollow portion of the upper sleeve (61). Therefore, the upper sleeve (61) and the lower sleeve (62) may form a step. That is, a through hole (65) without a step is formed in the center of the axially compliant frame (60), and the outer circumferential surface of the axially compliant frame (60) may form a step.

[0119] The axial compliance frame (60) can move upward by the refrigerant flowing into the first back pressure chamber (B1). The axial compliance frame (60) can move downward by the orbiting scroll (50). Specifically, when the pressure applied to the upper surface of the plate (51) of the orbiting scroll (50) is greater than the pressure applied to the lower surface of the plate (51), the orbiting scroll (50) moves downward, and the axial compliance frame (60) can move downward by the orbiting scroll (50). For example, when liquid refrigerant flows into the compression chamber formed by the fixed scroll (40) and the orbiting scroll (50), the axial compliance frame (60) can move downward by the orbiting scroll (50).

[0120] The axial compliance frame (60) may include a first sealing groove (63) and a second sealing groove (64). The first sealing groove (63) may be formed on the upper surface of the axial compliance frame (60), and the second sealing groove (64) may be formed on the lower surface of the outer surface of the axial compliance frame (60).

[0121] Specifically, a first sealing groove (63) may be formed at a certain depth on the upper surface of the upper sleeve (61). The cross-section of the first sealing groove (63) may be formed in a U-shape with a substantially flat bottom. The first sealing groove (63) may be formed around the through hole (65) of the axially compliant frame (60). The first sealing groove (63) and the through hole (65) may be formed concentrically.

[0122] A second sealing groove (64) may be formed at a certain depth on the outer surface of the lower sleeve (62). The cross-section of the second sealing groove (64) may be formed in a U-shape with a substantially flat bottom. The second sealing groove (64) may be formed adjacent to the lower end of the lower sleeve (62). The second sealing groove (64) may be formed along the entire circumference of the outer surface of the lower sleeve (62).

[0123] A first sealing (71) is installed in the first sealing groove (63), and a second sealing (72) is installed in the second sealing groove (64).

[0124] The first back pressure chamber (B1) may be formed as a space between the inner surface of the axially compliant frame (60) and the orbiting scroll (50). The second back pressure chamber (B2) may be formed as a space between the outer surface of the axially compliant frame (60), the orbiting scroll (50), and the inner surface of the receiving groove (25) of the main frame (20). The first back pressure chamber (B1) and the second back pressure chamber (B2) may not be connected to each other by the first sealing ring (71) and the second sealing ring (72) installed in the first sealing groove (63) and the second sealing groove (64).

[0125] Hereinafter, with reference to FIG. 7, the first seal (71) and the second seal (72) installed in the first sealing groove (63) and the second sealing groove (64) of the axial compliance frame (60) will be described in detail.

[0126] Fig. 7 is an enlarged cross-sectional view showing part A of Fig. 3.

[0127] Referring to Fig. 7, an axial compliance frame (60) is installed below a turning scroll (50). The axial compliance frame (60) can be inserted into a boss (53) of the turning scroll (50) to support the lower surface of the plate (51) of the turning scroll (50).

[0128] The lower sleeve (62) of the axial compliance frame (60) is inserted into the lower receiving groove (252) of the main frame (20), and the upper sleeve (61) is positioned in the upper receiving groove (251). That is, since the outer diameter of the upper sleeve (61) is larger than the diameter of the lower receiving groove (252) of the main frame (20), the upper sleeve (61) is not inserted into the lower receiving groove (252). Therefore, the lower surface of the upper sleeve (61) can be supported by the bottom surface of the upper receiving groove (251) of the main frame (20).

[0129] Accordingly, the space between the outer surface of the boss (53) of the orbiting scroll (50) and the inner surface of the axially compliant frame (60) forms a first back pressure chamber (B1). The upper end of the first back pressure chamber (B1) is blocked by the plate (51) of the orbiting scroll (50), and the lower end of the first back pressure chamber (B1) is blocked by the bottom surface of the lower receiving groove (252) of the main frame (20).

[0130] The space between the inner surface of the upper receiving groove (251) of the main frame (20), the outer surface of the plate (51) of the rotating scroll (50), and the outer surface of the axially compliant frame (60) forms a second back pressure chamber (B2). The upper end of the second back pressure chamber (B2) is blocked by the fixed scroll (50), and the lower end of the second back pressure chamber (B2) is blocked by the bottom surface of the upper receiving groove (251) of the main frame (20).

[0131] In the second pressure chamber (B2), an old ring (70) can be installed on the outside of the axial compliance frame (60).

[0132] The first pressure chamber (B1) and the second pressure chamber (B2) may not be connected to each other and may be isolated from each other by the first seal (71) and the second seal (72).

[0133] For example, a first seal (71) may be interposed between the lower surface of the plate (51) of the rotating scroll (50) and the upper surface of the axially compliant frame (60). Specifically, the first seal (71) may be installed in a first sealing groove (63) formed on the upper surface of the axially compliant frame (60).

[0134] The first sealing groove (63) may include an outer wall (631) and an inner wall (632). The height (h1) of the outer wall (631) and the height (h2) of the inner wall (632) may be formed differently. In the case of the first sealing groove (63) illustrated in FIG. 7, the height (h1) of the outer wall (631) is higher than the height (h2) of the inner wall (632) (h1>h2). Therefore, when the upper end of the outer wall (631) of the first sealing groove (633) contacts the lower surface of the plate (51) of the rotating scroll (50), the upper end of the inner wall (632) does not contact the lower surface of the plate (51). In addition, the height (h1) of the outer wall (631) may be formed to be greater than the thickness (t) of the first sealing (71) (h1>t).

[0135] In addition, the width (w1) of the first sealing groove (63) may be formed to be larger than the width (w) of the first sealing (71). Therefore, when the first sealing (71) is installed in the first sealing groove (63), a gap may exist between the first sealing groove (63) and the first sealing (71).

[0136] When the scroll compressor (1) operates and refrigerant is supplied to the first back pressure chamber (B1), the refrigerant in the first back pressure chamber (B1) can flow into the first sealing groove (63) through the gap between the lower surface of the plate (51) of the orbiting scroll (50) and the upper surface of the inner wall (632) of the axially compliant frame (60). When the refrigerant flows into the first sealing groove (63), the first sealing ring (71) rises, and the outer peripheral surface and the upper surface of the first sealing ring (71) come into contact with the outer wall (631) of the first sealing groove (63) and the lower surface of the plate (51). Therefore, the refrigerant in the first back pressure chamber (B1) does not flow into the second back pressure chamber (B2) between the first sealing ring (71) and the plate (51) of the orbiting scroll (50). At this time, the pressure (Pm1) of the first back pressure chamber (B1) is greater than the pressure (Pm2) of the second back pressure chamber (B2) (Pm1>Pm2). The pressure (Pm2) of the second back pressure chamber (B2) is greater than the inlet pressure (Ps) of the refrigerant flowing into the fixed scroll (50) (Pm2>Ps).

[0137] A second seal (72) may be interposed between the inner surface of the lower receiving groove (252) of the main frame (20) and the outer surface of the lower sleeve (62) of the axially compliant frame (60). Specifically, the second seal (72) may be installed in a second sealing groove (64) formed on the outer surface of the lower sleeve (62).

[0138] Since the depth of the second sealing groove (64) is lower than the height of the second sealing (72), the second sealing (72) protrudes from the second sealing groove (64) and is always in contact with the inner surface of the lower receiving groove (252). In other words, the gap between the outer surface of the lower sleeve (62) of the axially compliant frame (60) and the inner surface of the lower receiving groove (252) of the main frame (20) is blocked by the second sealing (72). Therefore, the refrigerant in the first back pressure chamber (B1) cannot flow into the second back pressure chamber (B2) through the gap between the outer surface of the lower sleeve (62) and the inner surface of the lower receiving groove (252) of the main frame (20).

[0139] A lower seal (73) may be interposed between the bottom surface of the lower receiving groove (252) of the main frame (20) and the lower surface of the boss (53) of the rotating scroll (50). Specifically, the lower seal (73) may be installed in the lower sealing groove (26) formed on the bottom surface of the lower receiving groove (252).

[0140] The space between the first back pressure chamber (B1) and the hole (54) of the boss (53) of the rotating scroll (50) is blocked by the lower seal (73). Therefore, the discharged refrigerant flowing into the hole (54) of the boss (53) cannot flow into the first back pressure chamber (B1) through the gap between the bottom surface of the lower receiving groove (252) and the flange (531) of the boss (53).

[0141] At this time, the pressure (Pd) of the hole (54) of the boss (53) filled with the discharged refrigerant is greater than the pressure (Pm1) of the first back pressure chamber (B1) (Pd>Pm1). Therefore, the pressure of the hole (54) of the boss (53) is the greatest, and the suction pressure (Ps) is the smallest. That is, Pd>Pm1>Pm2>Ps.

[0142] As another example, the height of the outer wall (631) of the first sealing groove (63) may be formed to be smaller than the height of the inner wall (632). This will be described below with reference to FIG. 8.

[0143] FIG. 8 is a partial cross-sectional view showing a rotating scroll (50) and an axially compliant frame (60) of a scroll compressor (1) according to one or more embodiments of the present disclosure.

[0144] Referring to Fig. 8, the space between the outer surface of the boss (53) of the orbiting scroll (50) and the inner surface of the axially compliant frame (60) forms a first back pressure chamber (B1). The upper end of the first back pressure chamber (B1) is blocked by the plate (51) of the orbiting scroll (50), and the lower end of the first back pressure chamber (B1) is blocked by the bottom surface of the lower receiving groove (252) of the main frame (20).

[0145] The space between the inner surface of the upper receiving groove (251) of the main frame (20), the outer surface of the plate (51) of the rotating scroll (50), and the outer surface of the axially compliant frame (60) forms a second back pressure chamber (B2). The upper end of the second back pressure chamber (B2) is blocked by the fixed scroll (40), and the lower end of the second back pressure chamber (B2) is blocked by the bottom surface of the upper receiving groove (251) of the main frame (20).

[0146] In the present embodiment, the pressure (Pm2) of the second back pressure chamber (B2) may be formed to be greater than the pressure (Pm1) of the first back pressure chamber (B1). That is, the first intermediate pressure passage (58) and the second intermediate pressure passage (59) may be formed to ensure that the pressure of the refrigerant supplied to the second back pressure chamber (B2) is greater than the pressure of the refrigerant supplied to the first back pressure chamber (B1).

[0147] The first pressure chamber (B1) and the second pressure chamber (B2) may not be connected to each other and may be isolated from each other by the first seal (71) and the second seal (72).

[0148] For example, a first seal (71) may be interposed between the lower surface of the plate (51) of the rotating scroll (50) and the upper surface of the axially compliant frame (60). Specifically, the first seal (71) may be installed in a first sealing groove (63) formed on the upper surface of the axially compliant frame (60).

[0149] The first sealing groove (63) may include an outer wall (631) and an inner wall (632). The height (h1) of the outer wall (631) and the height (h2) of the inner wall (632) may be formed differently. In the case of the first sealing groove (63) illustrated in FIG. 8, the height (h1) of the outer wall (631) is lower than the height (h2) of the inner wall (632) (h1 <h2). 따라서, 제1실링홈(63)의 내측벽(632)의 상단이 선회 스크롤(50)의 경판(51)의 하면과 접촉할 때, 외측벽(631)의 상단은 경판(51)의 하면과 접촉하지 않는다. 또한, 내측벽(632)의 높이(h2)는 제1실링(71)의 두께(t)보다 크게 형성될 수 있다(h2> t).

[0150] In addition, the width (w1) of the first sealing groove (63) may be formed to be larger than the width (w) of the first sealing (71). Therefore, when the first sealing (71) is installed in the first sealing groove (63), a gap may exist between the first sealing groove (63) and the first sealing (71).

[0151] When the scroll compressor (1) operates and refrigerant is supplied to the second back pressure chamber (B2), the refrigerant in the second back pressure chamber (B2) can flow into the first sealing groove (63) through the gap between the lower surface of the plate (51) of the orbiting scroll (50) and the upper surface of the outer wall (631) of the axially compliant frame (60). When the refrigerant flows into the first sealing groove (63), the first sealing ring (71) rises, and the inner circumferential surface and the upper surface of the first sealing ring (71) come into contact with the inner wall (632) of the first sealing groove (63) and the upper surface of the plate (51). Therefore, the refrigerant in the second back pressure chamber (B2) does not flow into the first back pressure chamber (B1) between the first sealing ring (71) and the plate (51) of the orbiting scroll (50). At this time, the pressure (Pm2) of the second back pressure chamber (B2) is greater than the pressure (Pm1) of the first back pressure chamber (B1) (Pm2>Pm1). The pressure of the first back pressure chamber (B1) is greater than the inlet pressure (Ps) of the refrigerant flowing into the fixed scroll (50) (Pm1>Ps).

[0152] The structure of the second sealing groove (64) and the lower sealing groove (26) is the same as the above-described example, so a detailed description is omitted.

[0153] Therefore, in the present embodiment, the pressure (Pd) of the hole (54) of the boss (53) is the largest, and the suction pressure (Ps) is the smallest. That is, Pd>Pm2>Pm1>Ps.

[0154] Hereinafter, with reference to FIGS. 9 and 10, the pressure distribution of a scroll compressor (100) according to the prior art and the pressure distribution of a scroll compressor (1) according to one or more embodiments of the present disclosure will be described in comparison.

[0155] Fig. 9 is a drawing showing the pressure distribution of the rotating scroll (50) of a scroll compressor (100) according to the prior art.

[0156] In a scroll compressor (100) according to the prior art, the greatest pressure is applied to the center of the upper surface of the orbiting scroll (150) and the least pressure is applied to the edge. This is because a plurality of compression pockets formed by the fixed scroll (140) and the orbiting scroll (150) move toward the center by the rotation of the orbiting scroll (150) and compress and discharge the refrigerant.

[0157] If the pressure applied to the upper surface of the orbiting scroll (150) is simplified, as shown in FIG. 9, it can be seen that approximately three different pressures are applied to the upper surface of the orbiting scroll (150). That is, the maximum pressure (P1) is applied to the center portion of the upper surface of the orbiting scroll (150) corresponding to the discharge port, the intermediate pressure (P2) is applied to the inside of the orbiting wrap (152) of the upper surface of the orbiting scroll (150), and the minimum pressure (P3) is applied to the edge of the upper surface of the orbiting scroll (50).

[0158] A back pressure chamber (B) is provided on the lower surface of the orbiting scroll (50). The back pressure chamber (B) is formed in the inner space of the receiving groove (125) of the main frame (120) on the outer side of the sealing (155). The back pressure chamber (B) is connected to the compression chamber on the upper side of the orbiting scroll (150) by an intermediate pressure passage (159). Therefore, since an intermediate pressure refrigerant is supplied to the back pressure chamber (B) through the intermediate pressure passage (159), an intermediate pressure can be applied to the back pressure chamber (B).

[0159] Referring to FIG. 9, two types of pressure are applied to the lower surface of the orbiting scroll (150). That is, a discharge pressure (Pd) is applied to the space inside the sealing (155), and an intermediate pressure (Pm) is applied to the back pressure chamber (B) outside the sealing (155). The discharge pressure (Pd) and the intermediate pressure (Pm) may correspond to the maximum pressure (P1) and the intermediate pressure (P2) applied to the upper surface of the orbiting scroll (150). Therefore, in the scroll compressor (100) according to the prior art, the pressure distribution applied to the upper surface of the orbiting scroll (150) and the pressure distribution applied to the lower surface of the orbiting scroll (50) are different.

[0160] As a result, in a scroll compressor (100) according to the prior art, friction loss of parts of the scroll compressor (100) may increase or axial refrigerant leakage may occur under conditions where the cooling load is greater or less than the reference cooling load.

[0161] FIG. 10 is a drawing showing the pressure distribution of a rotating scroll (50) of a scroll compressor (1) according to one or more embodiments of the present disclosure.

[0162] A scroll compressor (1) according to one or more embodiments of the present disclosure has the greatest pressure applied to the center of the upper surface of the orbiting scroll (50) and the smallest pressure applied to the edge. That is, pressure can be applied to the upper surface of the orbiting scroll (50) in the same manner as in the prior art.

[0163] If the pressure applied to the upper surface of the orbiting scroll (50) is simplified, as shown in FIG. 10, it can be seen that approximately three different pressures are applied to the upper surface of the orbiting scroll (50). That is, the maximum pressure (P1) is applied to the center portion of the upper surface of the orbiting scroll (50) corresponding to the discharge port, the intermediate pressure (P2) is applied to the inside of the orbiting wrap (52) of the upper surface of the orbiting scroll (50), and the minimum pressure (P3) is applied to the edge of the upper surface of the orbiting scroll (50).

[0164] Two back pressure chambers, namely, a first back pressure chamber (B1) and a second back pressure chamber (B2), are provided on the lower surface of the orbiting scroll (50). Refrigerants having different pressures can be supplied to the first back pressure chamber (B1) and the second back pressure chamber (B2). For example, the first back pressure chamber (B1) can be communicated with a compression pocket adjacent to the center portion of the orbiting scroll (50) through a first intermediate pressure passage (58). The second back pressure chamber (B2) can be communicated with a compression pocket adjacent to the edge of the orbiting scroll (50) through a second intermediate pressure passage (59). Therefore, the pressure of the first back pressure chamber (B1) can be higher than the pressure of the second back pressure chamber (B2).

[0165] Accordingly, the scroll compressor (1) according to one or more embodiments of the present disclosure can apply three different pressure levels to the lower surface of the orbiting scroll (50). That is, the discharge pressure (Pd) can be applied to the hole (54) of the boss (53) on the lower surface of the orbiting scroll (50), the first intermediate pressure (Pm1) can be applied to the first back pressure chamber (B1), and the second intermediate pressure (Pm2) can be applied to the second back pressure chamber (B2). The discharge pressure (Pd) can correspond to the maximum pressure (P1) applied to the upper surface of the orbiting scroll (50). The first intermediate pressure (Pm1) and the second intermediate pressure (Pm2) can correspond to the intermediate pressure (P2) and the minimum pressure (P3) applied to the upper surface of the orbiting scroll (50). The first intermediate pressure (Pm1) and the second intermediate pressure (Pm2) are not identical to the intermediate pressure (P2) and the lowest pressure (P3) applied to the upper surface, but the difference may not be large.

[0166] Therefore, the scroll compressor (1) according to one or more embodiments of the present disclosure may have a pressure distribution applied to the upper surface of the orbiting scroll (50) and a pressure distribution applied to the lower surface of the orbiting scroll (50) similar to each other. Therefore, the scroll compressor (1) according to one or more embodiments of the present disclosure may reduce friction loss and axial refrigerant leakage of components of the scroll compressor (1) under conditions where the cooling load is greater or less than the reference cooling load, compared to the scroll compressor (100) according to the prior art.

[0167] Specifically, in a scroll compressor (1) according to one or more embodiments of the present disclosure, under conditions where the cooling load is less than the reference cooling load, the difference in pressure applied to the upper and lower surfaces of the orbiting scroll (50) may be smaller than that of a scroll compressor (100) according to the prior art. Accordingly, axial refrigerant leakage that may occur due to the orbiting scroll (50) overturning can be reduced.

[0168] In addition, in a scroll compressor (1) according to one or more embodiments of the present disclosure, the difference in pressure applied to the upper and lower surfaces of the orbiting scroll (50) under conditions where the cooling load is greater than the reference cooling load may be smaller than that of a scroll compressor (100) according to the prior art. Accordingly, frictional loss of parts of the scroll compressor (1) that may occur due to contact between the fixed scroll (40) and the orbiting scroll (50) can be minimized.

[0169] In addition, the scroll compressor (1) according to one or more embodiments of the present disclosure is formed so that the axially compliant frame (60) installed below the orbiting scroll (50) can move up and down with respect to the orbiting scroll (50). Therefore, the gap between the mirror surface of the fixed scroll (40) and the upper surface of the plate (51) of the orbiting scroll (50) can be made larger than that of the scroll compressor (100) according to the prior art. Therefore, in the scroll compressor (1) according to one or more embodiments of the present disclosure, when liquid refrigerant is introduced into the compression chamber, the orbiting scroll (50) can be moved downward by the liquid refrigerant, so that the liquid refrigerant can be quickly discharged between the fixed scroll (40) and the orbiting scroll (50).

[0170] Fig. 11 is a partial cross-sectional view showing a back pressure chamber (B) of a scroll compressor (100) according to the prior art.

[0171] Referring to Fig. 11, in a scroll compressor (100) according to the prior art, the plate (151) of the orbiting scroll (150) is positioned between the lower surface of the fixed scroll (140) and the support (125) of the main frame (20). A seal (155) is interposed between the lower surface of the plate (151) of the orbiting scroll (150) and the support (125) of the main frame (120). The seal (155) can be installed in a sealing groove (126) formed on the upper surface of the support (125).

[0172] When the scroll compressor (100) operates, the upper surface of the plate (151) of the rotating scroll (150) contacts the lower surface of the fixed scroll (140), and the lower surface of the plate (151) can be supported by a seal (155) installed on the support (125) of the main frame (120).

[0173] Since the liquid refrigerant is not compressible, when the scroll compressor (100) is operating, if the liquid refrigerant flows into the interior of the fixed scroll (140), the fixed wrap of the fixed scroll (140) and the orbiting wrap of the orbiting scroll (150) may be damaged. Therefore, when the liquid refrigerant flows into the interior of the fixed scroll (140), it is necessary to ensure that the liquid refrigerant is quickly discharged between the fixed scroll (140) and the orbiting scroll (150).

[0174] As can be seen in Fig. 11, in the scroll compressor (100) according to the prior art, since the support part (125) of the main frame (120) is positioned below the orbiting scroll (150), the gap through which the orbiting scroll (150) can move downward due to the liquid refrigerant is very small. Accordingly, if the liquid refrigerant flows into the fixed scroll (140), it takes a long time for the liquid refrigerant to be discharged, which may damage the fixed wrap of the fixed scroll (140) and the orbiting wrap of the orbiting scroll (150).

[0175] However, in the scroll compressor (1) according to one or more embodiments of the present disclosure, the axially compliant frame (60) is axially movable in the receiving groove (25) of the main frame (20), so that the distance at which the orbiting scroll (50) can move downward is large. That is, the distance at which the orbiting scroll (50) can move downward by the distance at which the axially compliant frame (60) can move up and down is larger than the distance at which the orbiting scroll (150) of the scroll compressor (100) according to the prior art can move.

[0176] Therefore, when liquid refrigerant is introduced into the fixed scroll (40), the orbiting scroll (50) moves downward due to the liquid refrigerant, and the axial compliant frame (60) moves downward due to the orbiting scroll (50), so that the gap between the fixed scroll (40) and the orbiting scroll (50) increases. Therefore, the liquid refrigerant inside the fixed scroll (40) can be quickly discharged through the large gap formed between the fixed scroll (40) and the orbiting scroll (50). Therefore, the scroll compressor (1) according to one or more embodiments of the present disclosure can quickly discharge the liquid refrigerant inside the fixed scroll (40), thereby preventing or minimizing damage to the fixed wrap (43) of the fixed scroll (40) and the orbiting wrap (52) of the orbiting scroll (50).

[0177] Therefore, a scroll compressor (1) according to one or more embodiments of the present disclosure having a structure as described above can reduce friction loss and axial refrigerant leakage.

[0178] While the present disclosure has been illustrated and described above with reference to various embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. Casing; A main frame fixed to the inside of the above casing and having a receiving groove formed on the upper surface; A fixed scroll installed on the upper surface of the main frame; A rotating scroll installed in the receiving home of the above main frame and meshing with the above fixed scroll to form a compression chamber; An axially compliant frame installed in the receiving groove of the main frame so as to be able to move up and down on the lower side of the rotating scroll, and formed to divide the receiving groove into a first back pressure chamber and a second back pressure chamber; A drive shaft coupled to the lower portion of the above-described rotary scroll and rotating the above-described rotary scroll; and A scroll compressor, comprising: a drive motor installed on the lower side of the main frame and rotating the drive shaft; 2. In paragraph 1, The above first pressure chamber is located inside the above axial compliance frame, A scroll compressor, wherein the second pressure chamber is located outside the axial compliant frame.

3. In paragraph 2, A scroll compressor, wherein the first back pressure chamber and the second back pressure chamber are separated by a first seal installed between the upper surface of the axially compliant frame and the lower surface of the orbiting scroll, and a second seal installed between the outer surface of the axially compliant frame and the main frame.

4. In paragraph 3, The above axial compliance frame is, A first seal formed on the upper surface of the axially compliant frame so as to accommodate the first seal; and A scroll compressor, comprising: a second seal formed on an outer surface of the axially compliant frame so as to accommodate the second seal; 5. In paragraph 4, A scroll compressor, wherein the height of the inner wall of the first seal in contact with the first back pressure chamber is lower than the height of the outer wall in contact with the second back pressure chamber.

6. In paragraph 4, A scroll compressor, wherein the height of the outer wall of the first seal in contact with the second back pressure chamber is lower than the height of the inner wall in contact with the first back pressure chamber.

7. In paragraph 2, The above rotating scroll, A first intermediate pressure passage connecting the compression chamber and the first back pressure chamber; and A scroll compressor, comprising a second intermediate pressure passage connecting the compression chamber and the second back-pressure chamber.

8. In paragraph 7, A scroll compressor, wherein the first intermediate pressure passage is formed to connect the upper and lower surfaces of the rotating scroll.

9. In paragraph 7, A scroll compressor, wherein the second intermediate pressure passage is formed to connect the upper surface and the side surface of the rotating scroll.

10. In paragraph 1, The receiving home of the above main frame further includes an old ring installed at the bottom of the above turning scroll; A scroll compressor, wherein the above-mentioned old ring is installed on the outer side of the above-mentioned axially compliant frame.

11. In paragraph 1, A scroll compressor, wherein the pressure of the first back pressure chamber is greater than the pressure of the second back pressure chamber.

12. In paragraph 1, The above axial compliance frame is, an upper sleeve formed into a hollow cylindrical shape; and A lower sleeve extending from the lower surface of the upper sleeve and formed into a hollow cylindrical shape having an inner diameter equal to an outer diameter smaller than that of the upper sleeve; A first seal is formed on the upper surface of the upper sleeve, A scroll compressor, wherein a second seal is formed on the outer surface of the lower sleeve.

13. In paragraph 12, The above first pressure chamber is formed as a space between the rotating scroll and the inner surface of the axially compliant frame, A scroll compressor, wherein the second pressure chamber is formed by a space between the orbiting scroll, the receiving groove of the main frame, and the outer surface of the axially compliant frame.

14. In paragraph 12, The receiving home of the above main frame is, an upper receiving groove in which the upper sleeve is received; and A scroll compressor, comprising: a lower receiving groove formed on the bottom surface of the upper receiving groove to have a smaller diameter than the upper receiving groove and in which the lower sleeve is received; 15. In paragraph 1, A scroll compressor, wherein a lower seal is installed between the lower surface of the above-described rotating scroll and the bottom surface of the receiving groove of the above-described main frame.

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