Main frame for scroll compressor and scroll compressor

Abstract

The present invention relates to a main frame for a scroll compressor and a scroll compressor, the main frame comprising: an upper frame having a thrust surface provided to be in contact with a first scroll; a lower frame which is disposed below the upper frame and comprises an oil pocket part in which oil is accumulated; and an oil discharge hole which is formed through a side wall of the upper frame, wherein the oil discharge hole is located at a position spaced from the thrust surface by a shorter distance than from the bottom surface of the lower frame.

Description

The mainframe of the scroll compressor and the scroll compressor

[0001] The present invention relates to a scroll compressor for compressing a fluid such as a refrigerant.

[0002] Generally, a compressor refers to a mechanical device used for generating high pressure or transporting high-pressure fluids. Among these, compressors applied to vapor compression refrigeration cycles, such as those found in refrigerators and air conditioners, perform the function of compressing the refrigerant and transferring it to the condenser. These compressors can be classified into reciprocating, rotary, and scroll types depending on the method of compressing the refrigerant.

[0003] A scroll compressor corresponds to a scroll type. The scroll compressor is a compressor that continuously and repeatedly performs the suction, compression, and discharge of refrigerant by utilizing a compression chamber continuously created between the fixed wrap of the fixed scroll and the rotating wrap of the rotating scroll when the rotating scroll rotates while the rotating scroll is arranged in an interlocking manner within the internal space of a case.

[0004] Lubricating oil is supplied to areas where friction occurs during the process of suction, compression, and discharge of the refrigerant through the rotational movement of the aforementioned rotating scroll. This oil is supplied through the main frame supporting the aforementioned stationary scroll and the aforementioned rotating scroll, and circulates by repeatedly returning to the oil storage space located at the bottom of the aforementioned case. To this end, an oil drain hole is formed in the aforementioned main frame. After being discharged to the outside of the aforementioned main frame through the oil drain hole, the oil flows downward along the inner wall of the aforementioned case and is returned to the aforementioned oil storage space.

[0005] Recently, as the scroll compressor has become larger, it is implemented with a structure in which a balance weight is placed inside the main frame to enable the rotary scroll to rotate stably. To this end, the upper frame and the lower frame are manufactured separately and then combined to form the main frame. The balance weight can be placed in an oil pocket within the main frame where oil accumulates. Accordingly, as the balance weight rotates along with the rotary motion of the rotary scroll, the oil accumulated in the oil pocket can flow upward. Through this, the oil is supplied to the thrust surface of the main frame to perform lubrication. The thrust surface is a surface of the main frame positioned to face the rotary scroll, and is the part where friction with the rotary scroll occurs.

[0006] In this case, conventionally, the oil passing through the thrust surface is implemented to be discharged to the outside of the main frame through the oil drain hole formed in the lower frame. Accordingly, since the oil drain hole formed in the lower frame and the thrust surface formed in the upper frame were separated by a considerable distance from each other, the oil could not be discharged through the oil drain hole and could be discharged to the outside of the main frame through other parts, such as the boundary area where the upper frame and the lower frame are in contact with each other. As a result, the oil discharged to the outside of the main frame through parts other than the oil drain hole increases the oil circulation rate (OCR) as a portion of it is supplied to the compression chamber along with the refrigerant, which causes a problem of reducing compression efficiency.

[0007] Furthermore, conventionally, since the oil drain hole formed in the lower frame and the thrust surface formed in the upper frame were separated by a significant distance from each other, the flow rate of oil supplied from the oil pocket to the thrust surface may be reduced. Consequently, in the conventional method, there is a problem in that it is difficult to ensure product reliability as the lubrication performance of the thrust surface is degraded.

[0008] The present invention is devised to solve the problems described above and aims to provide a main frame of a scroll compressor and a scroll compressor capable of increasing the flow rate of oil discharged to the outside of the main frame through the oil drain hole.

[0009] The present invention is intended to provide a main frame and a scroll compressor that can increase the flow rate of oil supplied to the thrust surface and thereby improve the lubrication performance of the thrust surface, thereby ensuring product reliability.

[0010] To solve the above problems, the present invention may include the following configuration.

[0011] The main frame of a scroll compressor according to the present invention is for supporting a first scroll and a second scroll of the scroll compressor and may include: an upper frame having a thrust surface for contacting the first scroll; a lower frame disposed on the lower side of the upper frame and including an oil pocket portion where oil accumulates; and an oil drain hole formed by penetrating the side wall of the upper frame. The oil drain hole may be disposed at a position where the distance from the thrust surface is shorter than the distance from the bottom surface of the lower frame.

[0012] In the main frame of a scroll compressor according to the present invention, the upper frame may include an upper contact surface for contact with the lower frame. The lower frame may include a lower contact surface for contact with the upper frame. The upper contact surface and the lower contact surface are each formed as a continuously connected plane and are in close contact with each other to block the entry and exit of oil.

[0013] In the main frame of a scroll compressor according to the present invention, the upper frame may include an upper body for contacting the lower frame, and a thrust member protruding upward from the upper body. The thrust surface may be formed on the upper surface of the thrust member. The drain hole may be formed by penetrating the side wall of the upper body at a position where the distance from the bottom surface of the upper body and the distance from the upper surface of the upper body are equal.

[0014] In the main frame of a scroll compressor according to the present invention, the upper frame may include an upper body for contacting the lower frame, and a thrust member protruding upward from the upper body. The thrust surface may be formed on the upper surface of the thrust member. The drain hole may be formed penetrating the side wall of the upper body at a position where the distance from the upper surface of the upper body is shorter than the distance from the bottom surface of the upper body.

[0015] In the main frame of a scroll compressor according to the present invention, the upper frame may include an upper body for contacting the lower frame; a receiving groove formed on the bottom surface of the upper body; and a guiding groove formed to communicate with each of the receiving groove and the oil drain hole, and guiding oil located in the receiving groove to flow toward the oil drain hole.

[0016] In the main frame of the scroll compressor according to the present invention, the induction groove may be formed such that its depth increases and its width decreases as it extends from one side connected to the receiving groove to the other side connected to the drainage hole.

[0017] A scroll compressor according to the present invention may include: a case provided with an intake port for receiving refrigerant and a discharge port for discharging compressed refrigerant; a first scroll disposed inside the case; a second scroll disposed inside the case and engaging with the first scroll to form a compression chamber for compressing refrigerant; and a main frame disposed inside the case and supporting the first scroll and the second scroll. The main frame may include an upper frame provided with a thrust surface for contacting the first scroll; a lower frame disposed below the upper frame and including an oil pocket portion where oil accumulates; and an oil drain hole formed penetrating the side wall of the upper frame. The oil drain hole may be disposed at a position where the distance from the thrust surface is shorter than the distance from the bottom surface of the main frame.

[0018] In a scroll compressor according to the present invention, the upper frame may include an upper contact surface for adhering to the lower frame. The lower frame may include a lower contact surface for adhering to the upper frame. The upper contact surface and the lower contact surface are each formed as a continuously connected flat plane and are in close contact with each other to block the entry and exit of oil.

[0019] In a scroll compressor according to the present invention, the upper frame may include an upper body for contacting the lower frame, and a thrust member protruding upward from the upper body. The thrust surface may be formed on the upper surface of the thrust member. The drain hole may be formed by penetrating the side wall of the upper body.

[0020] In the scroll compressor according to the present invention, the drain hole may be positioned at a distance from the bottom surface of the upper body and at a distance from the top surface of the upper body that are equal to each other.

[0021] In the scroll compressor according to the present invention, the drain hole may be positioned at a location where the distance from the upper surface of the upper body is shorter than the distance from the lower surface of the upper body.

[0022] In a scroll compressor according to the present invention, the upper frame may include an upper body for contacting the lower frame; a receiving groove formed on the bottom surface of the upper body; and a guiding groove formed to communicate with each of the receiving groove and the oil drain hole, and guiding oil located in the receiving groove to flow toward the oil drain hole.

[0023] In the scroll compressor according to the present invention, the induction groove may be formed such that its depth increases as it extends from one side connected to the receiving groove to the other side connected to the drainage hole.

[0024] In the scroll compressor according to the present invention, the guide groove may be formed such that its width becomes narrower as it extends from one side connected to the receiving groove to the other side connected to the drain hole.

[0025] In a scroll compressor according to the present invention, the upper body may include a plurality of guide surfaces arranged on both sides of the guide groove with respect to the width direction of the guide groove. Each of the guide surfaces may be formed to form a curved surface that extends from one side of the guide groove to the other side of the guide groove.

[0026] In a scroll compressor according to the present invention, among the induction surfaces, the outer induction surface disposed outside the induction groove may be formed to form a curved surface based on a single center of curvature. Among the induction surfaces, the inner induction surface disposed inside the induction groove may be formed to form a curved surface in which a first induction curved surface based on a first center of curvature and a second induction curved surface based on a second center of curvature are continuously connected. The first center of curvature and the second center of curvature may be disposed on opposite sides with respect to the inner induction surface.

[0027] In a scroll compressor according to the present invention, the first guiding surface may be disposed on one side of the guiding groove. The second guiding surface may be disposed on the other side of the guiding groove and formed to form a curved surface that bends toward the drain hole.

[0028] In a scroll compressor according to the present invention, the main frame may include a plurality of drainage holes. The drainage holes may be formed by penetrating the side wall of the upper frame at positions spaced apart from each other.

[0029] The scroll compressor according to the present invention may include a drain pipe coupled to the upper frame so as to be connected to the drain hole. The drain pipe can discharge oil flowing in through the drain hole at a height lower than the intake port.

[0030] In a scroll compressor according to the present invention, the oil drain pipe may include an insertion member for being inserted into the oil drain hole, a connecting member coupled to the insertion member, a discharge member coupled to the connecting member for discharging oil introduced through the insertion member and the connecting member at a height lower than the suction port, and a flow hole for oil to flow through. The insertion member may include an insertion inner surface arranged to face the flow hole. The connecting member may include a connecting inner surface arranged to face the flow hole. The discharge member may include a discharge inner surface arranged to face the flow hole. The insertion inner surface and the discharge inner surface may be formed by extending in different directions. The connecting inner surface may be formed as a curved surface that is continuously connected to each of the insertion inner surface and the discharge inner surface.

[0031] According to the present invention, the following effects can be achieved.

[0032] In the present invention, since the distance from the thrust surface is shorter than the distance from the bottom surface of the main frame, the distance between the drain hole and the thrust surface can be reduced. Accordingly, the present invention can increase the flow rate of oil discharged to the outside of the main frame through the drain hole via the thrust surface, and can reduce the flow rate of oil discharged to the outside of the main frame through other parts of the main frame other than the drain hole. Therefore, since the flow rate of oil supplied to the compression unit can be reduced, the compression efficiency of the compression unit can be improved by lowering the oil circulation rate.

[0033] The present invention is implemented to reduce the distance between the surface of the oil accumulating in the oil pocket and the thrust surface. Accordingly, the present invention can increase the flow rate of oil supplied from the oil pocket to the thrust surface. Therefore, the present invention can contribute to ensuring product reliability by improving the lubrication performance of the thrust surface.

[0034] The present invention can be implemented such that the oil drain hole is positioned at a location where the distance from the upper surface of the upper body is shorter than the distance from the lower surface of the upper body having the upper frame. Accordingly, since the distance between the oil drain hole and the thrust surface can be further reduced, the flow rate of oil discharged to the outside of the main frame through the oil drain hole via the thrust surface can be further increased, as well as the flow rate of oil supplied from the oil pocket portion to the thrust surface can be further increased.

[0035] In the present invention, the upper contact surface of the upper frame of the main frame and the lower contact surface of the lower frame of the main frame can each be formed as a continuously connected plane. Accordingly, the lower contact surface and the upper contact surface are in close contact with each other, thereby blocking the entry and exit of oil through the space between the upper frame and the lower frame. Therefore, the present invention can further increase the flow rate of oil discharged through the drain hole, and thus further reduce the oil circulation rate.

[0036] The present invention can be implemented such that a receiving groove for receiving oil is formed in the upper frame, and a guiding groove is formed to communicate with each of the receiving groove and the drain hole. Accordingly, the present invention can use the guiding groove to guide the oil located in the receiving groove to flow toward the drain hole. Therefore, the present invention can increase the flow rate of oil discharged through the drain hole by using the guiding groove.

[0037] The present invention can be implemented such that the depth of the guide groove increases as it extends from one side connected to the receiving groove to the other side connected to the drain hole. Accordingly, the present invention can induce oil to flow toward the drain hole by utilizing the change in the depth of the guide groove, thereby increasing the flow rate of oil discharged through the drain hole. Furthermore, the present invention makes it possible to position the drain hole closer to the thrust surface by utilizing the depth of the guide groove, thus reducing the difference between the height of the oil accumulated in the oil pocket and the height of the thrust surface. Accordingly, the present invention can improve the lubrication performance of the thrust surface by increasing the flow rate of oil supplied from the oil pocket to the thrust surface.

[0038] The present invention can be implemented such that the width of the guide groove narrows as it extends from one side connected to the receiving groove to the other side connected to the drain hole. Accordingly, the present invention can induce oil to flow toward the drain hole by utilizing the change in the width of the guide groove, thereby increasing the flow rate of oil discharged through the drain hole.

[0039] In this invention, the guiding surfaces arranged on both sides of the guiding groove can be formed such that they extend toward the drain hole and form a curved surface, with the width direction of the guiding groove serving as the base line. Accordingly, this invention can utilize the guiding surfaces to guide the direction of oil flow to gradually change toward the drain hole. Therefore, since this invention can prevent the occurrence of turbulence, backflow, etc., during the process of oil flowing toward the drain hole, the oil can flow smoothly toward the drain hole and be discharged.

[0040] FIG. 1 is a schematic side cross-sectional view of an example of a scroll compressor according to the present invention.

[0041] FIG. 2 is a schematic enlarged view showing the upper portion of FIG. 1.

[0042] FIGS. 3 and 4 are schematic perspective views of an example of a first scroll and a second scroll in a scroll compressor according to the present invention.

[0043] FIG. 5 is a schematic block diagram of an example of a scroll compressor according to the present invention.

[0044] FIG. 6 is a schematic perspective view of the main frame of a scroll compressor according to the present invention.

[0045] FIG. 7 is a schematic cross-sectional view of the main frame of a scroll compressor according to the present invention based on the cutting line of FIG. 6.

[0046] FIGS. 8 and 9 are schematic cross-sectional views of an upper body based on the cutting line II of FIG. 6 in the main frame of a scroll compressor according to the present invention.

[0047] FIG. 10 is a schematic exploded perspective view of the main frame of a scroll compressor according to the present invention, viewed from above.

[0048] FIG. 11 is a schematic exploded perspective view of the main frame of a scroll compressor according to the present invention, viewed from below.

[0049] FIG. 12 is a schematic bottom perspective view of the upper body of the main frame of a scroll compressor according to the present invention.

[0050] FIG. 13 is a schematic bottom view of the upper body of the main frame of a scroll compressor according to the present invention.

[0051] FIG. 14 is a schematic cross-sectional view of the upper body of the main frame of a scroll compressor according to the present invention, based on the cutting line II-II of FIG. 13.

[0052] FIG. 15 is a schematic enlarged view of section A of FIG. 13.

[0053] FIG. 16 is a schematic perspective view showing an oil drain pipe connected to a main frame in a scroll compressor according to the present invention.

[0054] FIG. 17 is a schematic cross-sectional view showing the oil drain pipe connected to the main frame of a scroll compressor according to the present invention, based on the cutting line III-III of FIG. 16.

[0055] Hereinafter, an embodiment of a scroll compressor according to the present invention will be described in detail with reference to the attached drawings. Since the main frame of the scroll compressor according to the present invention may be included in the scroll compressor according to the present invention, it will be described together with the description of the embodiment of the scroll compressor according to the present invention. Meanwhile, it should be noted that when assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiment of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiment of the present invention, such detailed description will be omitted.

[0056] Referring to FIG. 1, the scroll compressor (1) according to the present invention is intended to compress a refrigerant and transmit the compressed refrigerant. For example, the scroll compressor (1) according to the present invention can be applied to a vapor compression type refrigeration cycle such as a refrigerator or an air conditioner. In this case, the scroll compressor (1) according to the present invention can perform the role of compressing the refrigerant and transmitting it to a condenser.

[0057] Referring to FIGS. 1 and FIGS. 2, a scroll compressor (1) according to the present invention may include a case (2), a compression unit (3), and a main frame (4).

[0058] The above case (2) may form the overall exterior of the scroll compressor (1) according to the present invention. The above case (2) may be formed in a hollow interior. The compression unit (3) may be disposed inside the above case (2). The above case (2) may be provided with an intake port (21) and a discharge port (22). Refrigerant may be introduced into the interior of the above case (2) through the intake port (21). Compressed refrigerant may be discharged from the interior of the above case (2) through the discharge port (22). The discharge port (22) may be connected to a pipe that delivers refrigerant to the condenser of the refrigeration cycle. The discharge port (22) may be placed at a higher height than the intake port (21). Inside the above case (2), the part connected to the intake port (21) and the part connected to the discharge port (22) may be partitioned by a high-low pressure separator (23). In this case, the portion connected to the suction port (21) inside the case (2) can be implemented as a suction space (231). The portion connected to the discharge port (22) inside the case (2) can be implemented as a discharge space (232). The high-low pressure separator (23) can separate the suction space (231), which is relatively low pressure, from the discharge space (232), which is relatively high pressure. The suction space (231) can be positioned below the high-low pressure separator (23), and the discharge space (232) can be positioned above the high-low pressure separator (23). The high-low pressure separator (23) can be coupled to the case (2) so as to be positioned inside the case (2). An oil storage space (24) for storing oil can be positioned inside the case (2). The oil stored in the oil storage space (24) can be supplied to the compression unit (3), etc., to perform lubrication, and then recovered to the oil storage space (24). The oil storage space (24) can be placed at the bottom (lower part) of the case (2).

[0059] An electric motor (25) may be placed inside the above case (2). The electric motor (25) may operate the compression unit (3). The electric motor (25) may generate rotational force and, by using the rotational force to rotate a rotating member (250), may operate the compression unit (3) to compress the refrigerant. The rotating member (250) may be coupled to the compression unit (3). Accordingly, the rotational force generated by the electric motor (25) may be transmitted to the compression unit (3) through the rotating member (250). The electric motor (25) may be placed on the lower side of the compression unit (3). Although not illustrated, the electric motor (25) may also be placed on the upper side of the compression unit (3).

[0060] The above-mentioned electric motor (25) may include a rotor (251) and a stator (252). The rotor (251) and the stator (252) may generate rotational force through electrical action. The rotor (251) may be coupled to the rotating member (250). The stator (252) may include a stator core (252a) and a stator coil (252b). The stator core (252a) may be fixed to the case (2). The stator coil (252b) may be wound on the stator core (252a). The stator coil (252b) may be electrically connected to an external power source through a terminal device (not shown) coupled to the case (2). When power is applied to the stator coil (252b) from the external power source, the rotor (251) rotates, thereby rotating the rotating member (250). The rotating member (250) can be rotatably coupled to the case (2). In this case, the upper part of the rotating member (250) is coupled to the compression part (3), and the lower part of the rotating member (250) can be rotatably coupled to the bottom of the case (2) through a bearing (250a). The bottom of the case (2) can support the oil stored in the oil storage space (24). The oil stored in the oil storage space (24) can flow upward through the oil pipe (253) provided in the rotating member (250) to perform lubrication in the electric motor (25), the compression part (3), etc. The oil pipe (253) can be placed inside the rotating member (250).

[0061] Referring to FIGS. 1 to 5, the compression unit (3) may be placed inside the case (2). The compression unit (3) may compress refrigerant. Refrigerant introduced into the suction space (231) through the suction port (21) may be supplied to the compression unit (3), compressed, and then discharged through the discharge space (232) via the discharge port (22). The compression unit (3) may be placed below the high-low pressure separator (23). That is, the compression unit (3) may be placed in the suction space (231). The compression unit (3) may discharge the compressed refrigerant into the discharge space (232). The compression unit (3) may be supported by the main frame (4).

[0062] The above compression unit (3) may include a first scroll (31) and a second scroll (32).

[0063] The first scroll (31) and the second scroll (32) may be arranged to be stacked vertically. By utilizing the relative rotation between the first scroll (31) and the second scroll (32), the compression unit (3) can compress the refrigerant and discharge the compressed refrigerant. In this case, either the first scroll (31) or the second scroll (32) may be implemented as a rotating scroll that performs a rotating motion, and the other may be implemented as a non-rotating scroll that does not rotate. The following description is based on an embodiment in which the first scroll (31) corresponds to a rotating scroll and the second scroll (32) corresponds to a non-rotating scroll; however, deriving from this an embodiment in which the first scroll (31) corresponds to a non-rotating scroll and the second scroll (32) corresponds to a rotating scroll will be obvious to those skilled in the art to which the present invention belongs.

[0064] The first scroll (31) may be placed inside the case (2). The first scroll (31) may be placed below the second scroll (32). The first scroll (31) may be coupled to the rotating member (250). Accordingly, the first scroll (31) may rotate by the rotational force transmitted through the rotating member (250). In this case, the first scroll (31) may be coupled to the rotating member (250) at an eccentric position (31a) spaced apart from the rotation axis (250b) of the rotating member (250). Accordingly, when the rotating member (250) rotates around the rotation axis (250b), the first scroll (31) can rotate along a circumference with a radius equal to the distance between the rotation axis (250b) and the eccentric position (31a). That is, the first scroll (31) can revolve around the rotation axis (250b). In this case, an eccentric member (250c) may be formed on the upper part of the rotating member (250). The eccentric member (250c) may be formed in a cylindrical shape centered on the eccentric position (31a). Compared to other parts of the rotating member (250) located below the eccentric member (250c), the eccentric member (250c) may be formed to have a smaller diameter. The first scroll (31) is coupled to the eccentric member (250c), so that it can orbit the rotation axis (250b) together with the eccentric member (250c) which orbits the rotation axis (250b).

[0065] In this case, the electric motor (25) may include a balance weight (254). The balance weight (254) can cause the rotating member (250) to rotate stably around the rotation axis (250b) by applying a load in a direction different from the direction in which the eccentric member (250c) is eccentric. For example, the balance weight (254) may apply a load by protruding in a direction opposite to the direction in which the eccentric member (250c) is eccentric. The balance weight (254) may be coupled to the rotating member (250). Although not illustrated, the balance weight (254) may be coupled to other structures, such as the rotor (251), so that the stability of the rotation of the rotating member (250) can be improved by applying a load in a direction different from the direction in which the eccentric member (250c) is eccentric. Meanwhile, the first scroll (31) can rotate in a state where rotation is blocked by the anti-rotation member (255). The anti-rotation member (255) can block the rotation of the first scroll (31) by using a locking mechanism, etc. For example, the rotation of the first scroll (31) can be blocked by inserting a key protrusion of the anti-rotation member (255) into a key groove of the first scroll (31). The anti-rotation member (255) can be coupled to the main frame (4).

[0066] The first scroll (31) may include a first plate section (311), a first wrap (312), and a rotation axis coupling section (313).

[0067] The first scroll plate (311) may be positioned below the second scroll (32). The first scroll plate (311) may be formed in the shape of a circular plate overall. The first scroll plate (311) may be positioned between the first wrap (312) and the rotation axis coupling part (313). The first scroll (31) may be supported on the main frame (4). The first scroll (31) may be supported on the main frame (4) so ​​as to be pivotable and capable of moving up and down. The first scroll (31) may also be supported on the main frame (4) so ​​as not to be pivotable and capable of moving up and down.

[0068] The first lap (312) may protrude from the first end plate (311) toward the second scroll (32). For example, the first lap (312) may protrude from the first end plate (311) in a spiral shape. A first compression chamber (310) may be provided inside the first lap (312). The first compression chamber (310) may be used as a space for compressing a refrigerant.

[0069] The above-mentioned rotational shaft coupling part (313) can be coupled to the above-mentioned first plate part (311). When the above-mentioned first lap (312) protrudes upward from the upper surface of the above-mentioned first plate part (311), the above-mentioned rotational shaft coupling part (313) can protrude downward from the lower surface of the above-mentioned first plate part (311). The above-mentioned rotational shaft coupling part (313) can be coupled to the above-mentioned rotating member (250). In this case, the above-mentioned rotating member (250c) can be inserted into the inside of the above-mentioned rotational shaft coupling part (313), thereby allowing the above-mentioned rotating member (250) to be coupled to the above-mentioned rotational shaft coupling part (313). Through the above-mentioned rotational shaft coupling part (313), the above-mentioned first scroll (31) can rotate with the rotational force transmitted from the above-mentioned rotating member (250).

[0070] The second scroll (32) may be placed inside the case (2). The second scroll (32) may be placed above the first scroll (31). The second scroll (32) and the first scroll (31) may interlock to form a compression chamber (310, 320) for compressing refrigerant. The second scroll (32) may be connected to the suction space (231) and the discharge space (232), respectively. Accordingly, the refrigerant may be introduced into the compression chamber (310, 320) through the second scroll (32), compressed, and then discharged into the discharge space (232) through the second scroll (32). In this case, an inlet (not shown) may be formed on the side wall of the second scroll (32) to allow the refrigerant present in the suction space (231) to flow in. A discharge hole (321) may be formed at the upper part of the second scroll (32) to discharge compressed refrigerant into the discharge space (232). The second scroll (32) may be supported on the main frame (4). When the first scroll (31) rotates, the second scroll (32) may not rotate. The second scroll (32) may be fixedly coupled to the main frame (4) so ​​as not to rotate and not to move up and down. The second scroll (32) may also be coupled to the main frame (4) so ​​as to be able to move up and down without rotating.

[0071] The second scroll (32) may include a second screen plate (322) and a second wrap (323).

[0072] The second mirror plate (322) may be positioned above the first scroll (31). The second mirror plate (322) may be positioned above the first mirror plate (311). The second mirror plate (322) may be formed in the shape of a circular plate overall. The second mirror plate (322) may be positioned between the high-low pressure separator (23) and the second wrap (323). The second mirror plate (322) may be coupled to the main frame (4). The second mirror plate (322) may be fixedly coupled to the main frame (4) or may be coupled to the main frame (4) so ​​as to be able to move up and down. In this case, the second mirror plate (322) may be coupled to the main frame (4) so ​​as not to rotate. The discharge hole (321) may be formed in the second mirror plate (322). The discharge hole (321) may be formed by penetrating the second mirror plate (322).

[0073] The second lap (323) may protrude from the second end plate (322) toward the first scroll (31). For example, the second lap (323) may protrude from the second end plate (322) in a spiral shape. The second lap (323) may be arranged to interlock with the first lap (312). In this case, a second compression chamber (320) may be provided inside the second lap (323). The second compression chamber (320) may be used as a space for compressing refrigerant. In this case, as the first scroll (31) rotates, the volumes of the second compression chamber (320) and the first compression chamber (310) may change, thereby enabling the suction of refrigerant, compression of refrigerant, and discharge of refrigerant. This process can be performed with the lower end of the second wrap (323) in contact with the upper surface of the first mirror plate (311) and the upper end of the first wrap (312) in contact with the lower surface of the second mirror plate (322). Contact between the second wrap (323) and the first mirror plate (311), and contact between the first wrap (312) and the second mirror plate (322) can be achieved by the rising of the first scroll (31). Contact between the second wrap (323) and the first mirror plate (311), and contact between the first wrap (312) and the second mirror plate (322) can also be achieved by the lowering of the second scroll (32) and the rising of the first scroll (31). The inlet may be formed in the second wrap (323).

[0074] Referring to FIGS. 1 to 7, the main frame (4) may be placed inside the case (2). The main frame (4) may be fixedly coupled to the case (2). The main frame (4) may support the first scroll (31) and the second scroll (32). The main frame (4) may be implemented as the main frame of a scroll compressor according to the present invention.

[0075] The main frame (4) may be positioned between the first scroll (31) and the rotor (251). The rotating member (250) may be inserted into the interior of the main frame (4) and coupled to the rotation axis coupling portion (313) of the first scroll (31). The main frame (4) may be positioned above the stator (252). A through hole (40) may be formed in the main frame (4). The through hole (40) may be formed by penetrating the main frame (4). The rotating member (250) may be inserted into the interior of the main frame (4) through the through hole (40) and coupled to the first scroll (31).

[0076] The above main frame (4) may include an upper frame (41) and a lower frame (42).

[0077] The upper frame (41) may be positioned above the lower frame (42). The upper frame (41) may be positioned between the first scroll (31) and the lower frame (42). A thrust surface (411) may be provided on the upper frame (41). The thrust surface (411) is intended to come into contact with the first scroll (31). The thrust surface (411) may be positioned to face the bottom surface of the first face plate portion (311) of the first scroll (31). The thrust surface (411) may be formed to surround the perimeter of the through hole (40).

[0078] The lower frame (42) may be positioned below the upper frame (41). The lower frame (42) and the upper frame (41) may be manufactured individually and then combined to form the main frame (4). The through hole (40) may be formed by penetrating both the lower frame (42) and the upper frame (41). Through the through hole (40), the rotating member (250) and the first scroll (31) may be combined inside the lower frame (42) and the upper frame (41).

[0079] The lower frame (42) may include an oil pocket portion (421). The oil pocket portion (421) may be placed inside the lower frame (42). Oil may accumulate in the oil pocket portion (421). The oil accumulated in the oil pocket portion (421) may be supplied through the oil pipe (253). The oil accumulated in the oil pocket portion (421) may be supplied to the thrust surface (411) to perform lubrication. Some of the oil accumulated in the oil pocket portion (421) may be supplied to the compression portion (3), the anti-rotation member (255), etc. to perform lubrication. The oil pocket portion (421) may be formed inside the lower frame (42) to be connected to the through hole (40). The balance weight (254) may be placed in the oil pocket portion (421). The balance weight (254) can rotate as the rotating member (250) rotates, thereby allowing the oil accumulated in the oil pocket (421) to flow upward. Through this, the oil accumulated in the oil pocket (421) can be supplied to the thrust surface (411), etc., to perform lubrication. The oil pocket (421) may be formed in both the lower frame (42) and the upper frame (41). A bearing portion (422) may be provided at the bottom of the lower frame (42). The rotating member (250) may be rotatably coupled to the main frame (44) through the bearing portion (422).

[0080] A scroll support member (423) may be coupled to the lower frame (42). The scroll support member (423) may support the second scroll (32). The scroll support member (423) may be formed to protrude laterally from the side of the lower frame (42) and to protrude upward from the portion protruding laterally. When the lower frame (42) and the upper frame (41) are coupled, the scroll support member (423) may be positioned on the outside of the upper frame (41) to support the second scroll (32). The second scroll (32) may be fixedly coupled to the scroll support member (423). The second scroll (32) may also be coupled to the scroll support member (423) so as to be able to move up and down. The scroll support member (423) and the lower frame (42) may be formed integrally. A plurality of scroll support members (423) may be coupled to the lower frame (42). The scroll support members (423) may be arranged at positions spaced apart from each other along the circumferential direction centered on the rotation axis (250b).

[0081] The above main frame (4) may include a drainage hole (43).

[0082] The above oil drain hole (43) can discharge oil from the inside of the main frame (4) to the outside of the main frame (4). The above oil drain hole (43) can be formed by penetrating the main frame (4) so ​​as to be in communication with both the inside of the main frame (4) and the outside of the main frame (4). The above oil drain hole (43) can be formed by penetrating the side wall (410) of the upper frame (41). The side wall (410) of the upper frame (41) is arranged to surround the through hole (40) formed in the upper frame (41). Since the through hole (40) formed in the upper frame (41) is in communication with the oil pocket portion (421), the oil located in the through hole (40) and the oil pocket portion (421) can be discharged to the outside of the main frame (4) through the above oil drain hole (43).

[0083] The above-mentioned drain hole (43) may be positioned such that the distance from the thrust surface (411) is shorter than the distance from the bottom surface (4a) of the main frame (4). Accordingly, compared to a comparative example where the drain hole (43) is formed in the lower frame (42), the scroll compressor (1) according to the present invention is implemented to reduce the distance between the drain hole (43) and the thrust surface (411). Therefore, the scroll compressor (1) according to the present invention can increase the flow rate of oil discharged to the outside of the main frame (4) through the drain hole (43) after passing through the thrust surface (411). This is because the oil passing through the thrust surface (411) can be discharged through the drain hole (43) before reaching the boundary between the upper frame (41) and the lower frame (42). Through this, the flow rate of oil discharged to the outside of the main frame (4) through the boundary portion between the upper frame (41) and the lower frame (42), etc., can be reduced. Accordingly, the scroll compressor (1) according to the present invention can reduce the flow rate of oil supplied to the compression unit (3), thereby lowering the oil circulation rate (OCR) and improving the compression efficiency of the compression unit (3). In addition, the scroll compressor (1) according to the present invention is implemented so that the distance between the thrust surface (411) and the oil drain hole (43) can be reduced, thereby reducing the distance between the surface of the oil accumulating in the oil pocket (421) and the thrust surface (411). That is, the difference between the height of the oil accumulating in the oil pocket (421) and the height of the thrust surface (411) can be reduced. Accordingly, the scroll compressor (1) according to the present invention can increase the flow rate of oil supplied from the oil pocket portion (421) to the thrust surface (411). Therefore, the scroll compressor (1) according to the present invention can contribute to securing product reliability by improving the lubrication performance of the thrust surface (411).Meanwhile, the above drainage hole (43) may be positioned at a location where the distance from the thrust surface (411) is shorter than the distance from the bottom surface of the lower frame (42). That is, the bottom surface (4a) of the main frame (4) may correspond to the bottom surface of the lower frame (42).

[0084] Referring to FIGS. 6 through 9, the drainage hole (43) may be formed by penetrating the side wall of the upper body (412) of the upper frame (41). In this case, the upper frame (41) may include the upper body (412) and a thrust member (413). The upper body (412) may correspond to a part of the upper frame (41) to contact the lower frame (42). The thrust member (413) may correspond to a part of the upper frame (41) protruding upward from the upper body (412). The thrust surface (411) may be formed on the upper surface of the thrust member (413). The thrust member (413) may be formed to have a smaller diameter than the upper body (412).

[0085] As illustrated in FIG. 8, the drain hole (43) may be positioned such that the distance from the bottom surface (412a) of the upper body (412) and the distance from the top surface (412b) of the upper body (412) are equal. In this case, the sum of the height of the thrust member (413) and the distance from the top of the drain hole (43) to the top surface (412b) of the upper body (412) may correspond to the distance from the drain hole (43) to the thrust surface (411).

[0086] As illustrated in FIG. 9, the oil drain hole (43) may be positioned such that the distance from the upper surface (412b) of the upper body (412) is shorter than the distance from the lower surface (412a) of the upper body (412). In this case, the distance between the oil drain hole (43) and the thrust surface (411) can be further reduced, so the scroll compressor (1) according to the present invention can increase the flow rate of oil discharged to the outside of the main frame (4) through the thrust surface (411) and the oil drain hole (43), as well as increase the flow rate of oil supplied from the oil pocket portion (421) to the thrust surface (411).

[0087] Referring to FIGS. 6 to 11, the main frame (4) can be implemented to reduce the flow rate of oil flowing out through the space between the upper frame (41) and the lower frame (42). To this end, the upper frame (41) may include an upper contact surface (414), and the lower frame (42) may include a lower contact surface (424).

[0088] The upper contact surface (414) is intended to be in contact with the lower frame (42). The upper contact surface (414) may correspond to the bottom surface of the upper frame (41). The bottom surface (412a) of the upper body (412) may correspond to the upper contact surface (414).

[0089] The lower contact surface (424) is intended to be in contact with the upper frame (41). The lower contact surface (424) may correspond to the upper surface of the lower frame (42). When a plurality of scroll support members (423) are coupled to the lower frame (42), the lower contact surface (424) may be positioned on the inner side of the scroll support members (423).

[0090] The lower contact surface (424) and the upper contact surface (414) can each be formed as a continuously connected plane. Accordingly, the lower contact surface (424) and the upper contact surface (414) can be in close contact with each other to block the entry and exit of oil. Therefore, the scroll compressor (1) according to the present invention can block oil from leaking through the boundary portion between the lower frame (42) and the upper frame (41) by utilizing the close surface contact between the lower contact surface (424) and the upper contact surface (414). Accordingly, the scroll compressor (1) according to the present invention can further increase the flow rate of oil discharged through the oil drain hole (43), thereby further reducing the oil circulation rate.

[0091] Referring to FIGS. 6 to 15, the scroll compressor (1) according to the present invention can be implemented to guide the direction of oil flow toward the drain hole (43). To this end, the upper frame (41) may include a receiving groove (415) and a guiding groove (416).

[0092] The receiving groove (415) may be formed on the bottom surface (412b) of the upper body (412). The receiving groove (415) may be implemented as a groove formed to a certain depth from the bottom surface (412b) of the upper body (412). The receiving groove (415) may be formed to communicate with each of the through hole (40) and the oil drainage hole (43). A side wall (410) of the upper frame (41) may be placed around the receiving groove (415). In this case, the side wall (410) may be placed to surround the outside of the receiving groove (415). As oil accumulates in the oil pocket portion (421), oil may be received in the receiving groove (415).

[0093] The induction groove (416) may be formed on the inner bottom surface of the upper body (412) in which the receiving groove (415) is formed. The induction groove (416) may be implemented as a groove formed to a certain depth from the inner bottom surface. The induction groove (416) may be formed to communicate with each of the receiving groove (415) and the drainage hole (43). The induction groove (416) may guide the oil located in the receiving groove (415) to flow toward the drainage hole (43). Accordingly, the induction groove (416) may further increase the flow rate of oil discharged through the drainage hole (43).

[0094] The above-mentioned guide groove (416) can be formed such that its depth increases as it extends from one side (416a) connected to the receiving groove (415) to the other side (416b) connected to the drain hole (43). Accordingly, the guide groove (416) can be formed such that its volume capable of receiving oil increases as it extends toward the drain hole (43). Therefore, the scroll compressor (1) according to the present invention can induce oil to flow toward the drain hole (43) by utilizing the change in depth of the guide groove (416), thereby increasing the flow rate of oil discharged through the drain hole (43). In addition, the scroll compressor (1) according to the present invention can utilize the depth of the induction groove (416) to position the drain hole (43) closer to the thrust surface (411), thereby reducing the difference between the height of the oil accumulating in the oil pocket portion (421) and the height of the thrust surface (411). Accordingly, the scroll compressor (1) according to the present invention can improve the lubrication performance of the thrust surface (411) by increasing the flow rate of oil supplied from the oil pocket portion (421) to the thrust surface (411).

[0095] The above-mentioned guide groove (416) may be formed such that its width narrows as it extends from one side (416a) connected to the receiving groove (415) to the other side (416b) connected to the drain hole (43). In this case, the width of the guide groove (416) may be a length based on the radial direction centered on the rotation axis (250b, shown in FIG. 2). Accordingly, the scroll compressor (1) according to the present invention can induce oil to flow toward the drain hole (43) by utilizing the change in the width of the guide groove (416), thereby increasing the flow rate of oil discharged through the drain hole (43).

[0096] When the above-mentioned guide groove (416) is provided, the upper body (412) may include a plurality of guide surfaces (417, 418). The guide surfaces (417, 418) may be arranged on both sides of the guide groove (416) based on the width direction of the guide groove (416). The guide surfaces (417, 418) may be arranged to face the guide groove (416) to guide the flow direction of oil flowing along the guide groove (416). Each of the guide surfaces (417, 418) may be formed to form a curved surface that extends from one side (416a) of the guide groove (416) to the other side (416b) of the guide groove (416). Accordingly, the scroll compressor (1) according to the present invention can use the guiding surfaces (417, 418) to induce the direction of oil flow to gradually change toward the drain hole (43). Therefore, the scroll compressor (1) according to the present invention can prevent turbulence, backflow, etc. from occurring during the process of oil flowing toward the drain hole (43), so that the oil can flow smoothly toward the drain hole (43) and be discharged.

[0097] The upper body (412) may include an outer guide surface (417) and an inner guide surface (418).

[0098] The outer guide surface (471) may be positioned outside the guide groove (416) among the guide surfaces (417, 418). The outer guide surface (417) may correspond to a part of the inner surface of the side wall (410) positioned toward the guide groove (416). The outer guide surface (417) may be formed to form a curved surface with respect to a single center of curvature. The outer guide surface (417) may be formed as a curved surface centered on the axis of rotation (250b, shown in FIG. 2).

[0099] The inner guide surface (418) may be positioned on the inside of the guide groove (416) among the guide surfaces (417, 418). The inner guide surface (418) may be positioned on the through hole (40) side with respect to the guide groove (416). The inner guide surface (418) may include a first guide curved surface (418a) and a second guide curved surface (418b). The first guide curved surface (418a) may be formed as a curved surface based on a first center of curvature. The second guide curved surface (418b) may be formed as a curved surface based on a second center of curvature. The second center of curvature and the first center of curvature may be positioned on opposite sides with respect to the inner guide surface (418). For example, if the first center of curvature is positioned inwardly spaced apart from the inner guide surface (418), the second center of curvature may be positioned outwardly spaced apart from the inner guide surface (418). In this case, the first guide surface (418a) may be formed as a convex curved surface toward the outer guide surface (417), and the second guide surface (418b) may be formed as a concave curved surface toward the outer guide surface (417). The second guide surface (418b) and the first guide surface (418a) may be formed to form a continuously connected curved surface. In this way, the inner guide surface (418) is implemented to form a continuously connected curved surface while extending toward the drain hole (43) and changing the direction of the curved surface, thereby allowing oil to flow more smoothly toward the drain hole (43) and be discharged. The first guiding surface (418a) may be positioned on one side (416a) of the guiding groove (416), and the second guiding surface (418b) may be positioned on the other side (416b) of the guiding groove (416) to form a curved surface that bends toward the drainage hole (416b).In this case, the first guiding surface (418a) may be formed to have a convex curved surface toward the side wall (410) of the upper frame (41), and the second guiding surface (418b) may be formed to have a convex curved surface in the direction from one side (416a) of the guiding groove (416) toward the other side (416b) of the guiding groove (416). Accordingly, in the section where the first guiding surface (418a) is positioned, the width of the entrance of the guiding groove (416) can be widened to increase the flow rate of oil flowing into the guiding groove (416), and after passing the entrance of the guiding groove (416), the width of the guiding groove (416) can be formed to gradually narrow so that the oil can be guided to flow toward the drain hole (43). In this case, as the width of the guide groove (416) gradually narrows while the depth of the guide groove (416) deepens, the flow rate of oil escaping from the guide groove (416) can be reduced. In the section where the second guide curved surface (418b) is arranged, by increasing the size of the space arranged on the inlet side of the drain hole (43), a space where oil can wait to enter the drain hole (43) can be secured.

[0100] Meanwhile, the direction from one side (416a) of the induction groove (416) toward the other side (416b) of the induction groove (416) can be implemented in the same direction as the rotation direction in which the rotating member (250) rotates. For example, when the rotating member (250) rotates clockwise around the rotation axis (250b), the induction groove (416) can be formed to extend clockwise around the rotation axis (250b), with the width becoming narrower and the depth becoming deeper. Accordingly, the scroll compressor (1) according to the present invention can increase the flow rate of oil discharged through the induction groove (416) to the drain hole (43) by utilizing the direction of oil flow caused by the rotation of the rotating member (250).

[0101] Referring to FIGS. 1 to 15, the main frame (4) may include a plurality of oil drainage holes (43). The oil drainage holes (43) may be formed by penetrating the side wall (410) of the upper frame (41) at positions spaced apart from each other. Accordingly, the oil drainage holes (43) can discharge oil to the outside of the main frame (4) at different positions. Therefore, the scroll compressor (1) according to the present invention can increase the flow rate of oil discharged to the outside of the main frame (4) through the oil drainage holes (43), and thus can reduce the flow rate of oil discharged to the outside of the main frame (4) through parts other than the oil drainage holes (43).

[0102] Referring to FIGS. 1 to 17, the scroll compressor (1) according to the present invention may include an oil drain pipe (5).

[0103] The above oil drain pipe (5) can be coupled to the upper frame (41) so as to be connected to the oil drain hole (43). The above oil drain pipe (5) can discharge oil flowing in through the above oil drain hole (43) to the outside of the main frame (4). The above oil drain pipe (5) can discharge oil flowing in through the above oil drain hole (43) at a lower height than the above intake port (21). Accordingly, the scroll compressor (1) according to the present invention is implemented to reduce the flow rate of oil supplied to the compression unit (3) together with the refrigerant from the oil discharged from the above oil drain pipe (5). That is, the scroll compressor (1) according to the present invention can improve the compression efficiency of the compression unit (3) by lowering the oil circulation rate (OCR) using the above oil drain pipe (5).

[0104] The above drain pipe (5) may include an insertion member (51), a connecting member (52), and a discharge member (53).

[0105] The insert member (51) can be inserted into the drain hole (43). The insert member (51) can be inserted into the drain hole (43) and connected to the interior of the main frame (4). In this case, the insert member (51) can be connected to the oil pocket portion (421). Accordingly, some of the oil accumulated in the oil pocket portion (421) can flow into the interior of the drain pipe (5) through the drain hole (43) and the insert member (51).

[0106] The connecting member (52) can be coupled to each of the insertion member (51) and the discharge member (53). The connecting member (52) can be positioned between the insertion member (51) and the discharge member (53). The connecting member (52) can transfer oil flowing in from the insertion member (51) to the discharge member (53).

[0107] The discharge member (53) may be coupled to the connecting member (52). The discharge member (53) may discharge oil that has flowed in through the insert member (51) and the connecting member (52) at a height lower than the suction port (21). In this case, the lower end of the discharge member (53) from which oil is discharged may be positioned at a height lower than the suction port (21). The discharge member (53), the connecting member (52), and the insert member (51) may be formed integrally.

[0108] The above oil drain pipe (5) may include a flow hole (50) for oil to flow through. The flow hole (50) may be formed by penetrating the insertion member (51), the connecting member (52), and the discharge member (53). Accordingly, one side of the flow hole (50) may be connected to the oil drain hole (43) and the oil pocket portion (421) in communication, and the other side may be connected to the interior of the case (2). In this case, one side of the flow hole (50) may be positioned to face the oil drain hole (43). The other side of the flow hole (50) may be positioned to face the bottom of the case (2). Oil discharged through the other side of the flow hole (50) may be recovered into the oil storage space (24).

[0109] When the above flow hole (50) is provided, the insertion member (51) may include an insertion inner surface (511, illustrated in FIG. 17) positioned toward the flow hole (50). The connecting member (52) may include a connecting inner surface (521, illustrated in FIG. 17) positioned toward the flow hole (50). The discharge member (53) may include a discharge inner surface (531, illustrated in FIG. 17) positioned toward the flow hole (50). The discharge inner surface (531) and the insertion inner surface (511) may be formed by extending in different directions. For example, when the insertion member (51) is inserted into the drainage hole (43), the insertion inner surface (511) may be formed by extending in a direction parallel to the horizontal direction. The discharge inner surface (531) may be formed by extending in a direction parallel to the vertical direction. In this case, the discharge inner surface (531) and the insertion inner surface (511) may be formed by extending in directions perpendicular to each other. When the discharge inner surface (531) and the insertion inner surface (511) are formed by extending in different directions, the connecting inner surface (521) may be formed as a curved surface that is continuously connected to each of the insertion inner surface (511) and the discharge inner surface (531). Accordingly, the scroll compressor (1) according to the present invention can reduce flow resistance that occurs during the process of oil flowing along the insertion inner surface (511), the connecting inner surface (521), and the discharge inner surface (531) inside the oil drain pipe (5). Therefore, since the oil can be smoothly discharged through the oil drain pipe (5), the scroll compressor (1) according to the present invention can prevent the flow rate of oil flowing to the compression part (3) from increasing as the flow rate of oil that was not discharged through the oil drain pipe (5) increases. For example, the above-mentioned connecting inner surface (521) can be formed to form a curved surface that bends along a quadrant.

[0110] A sealing part (54) may be attached to the above oil drain pipe (5). The sealing part (54) may be attached to the insertion member (51) to surround the outer surface of the insertion member (51). Accordingly, when the insertion member (51) is inserted into the oil drain hole (43), the sealing part (54) can seal the space between the main frame (4) and the insertion member (51) within the oil drain hole (43). Thus, the sealing part (54) can prevent oil from leaking through the space between the main frame (4) and the insertion member (51). For example, the sealing part (54) may be implemented as an O-ring.

[0111] Referring to FIGS. 1 to 17, the scroll compressor (1) according to the present invention may include a limiting part (6).

[0112] The above limiting part (6) can limit the distance that the oil drain pipe (5) can move in the removal direction to be removed from the main frame (4), and can limit the distance that the oil drain pipe (5) can rotate along the circumferential direction centered on the oil drain hole (43). Accordingly, the above limiting part (6) can not only reduce the possibility that the oil drain pipe (5) will be removed from the main frame (4), but also align the oil drain pipe (5) in a position that can reduce the oil circulation rate. Therefore, the above limiting part (6) can improve the stability of the operation of draining oil using the oil drain pipe (5), improve the ease and accuracy of the operation of attaching the oil drain pipe (5) to the main frame (4) in a position that reduces the oil circulation rate, and ensure that the oil drain pipe (5) is firmly maintained in a position that reduces the oil circulation rate. In this way, the limiting part (6) may have a removal limiting function that limits the distance the oil drain pipe (5) can move from the main frame (4) in the removal direction, and a rotation limiting function that limits the rotation of the oil drain pipe (5) in addition to aligning the oil drain pipe (5) in a position that can lower the oil circulation rate.

[0113] The above-mentioned limiting part (6) may include a limiting member (61) and a fastening member (62).

[0114] The limiting member (61) may protrude from the outer surface of the connecting member (52) having the drain pipe (5). When the insertion member (51) having the drain pipe (S5) is inserted into the drain hole (43), the limiting member (61) may protrude from the outer surface of the connecting member (52) in a radial direction with the drain hole (43) as the center of the circle. When the insertion member (51) is inserted into the drain hole (43), the limiting member (61) may be positioned to contact the side wall (410) of the upper frame (41) from the outside of the drain hole (43). The limiting member (61) may be formed in a plate shape overall. The limiting member (61) and the connecting member (52) may be formed integrally.

[0115] The fastening member (62) is fastened to the upper frame (41) to connect the limiting member (61) to the upper frame (41). In this case, the fastening member (62) can be inserted into an insertion hole (not shown) formed in the limiting member (61) and a fastening groove (not shown) formed in the upper frame (41). Accordingly, the fastening member (62) is supported by the upper frame (41) to support the limiting member (61), thereby enabling the removal restriction function and rotation restriction function for the drain pipe (5).

[0116] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by such embodiments. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

Claims

1. A case provided with an intake port for the inflow of refrigerant and an outlet port for discharging compressed refrigerant; A first scroll disposed inside the above case; A second scroll disposed inside the above case and engaging with the first scroll to form a compression chamber for compressing a refrigerant; and It includes a main frame disposed inside the above case and supporting the first scroll and the second scroll, and The above mainframe is, An upper frame provided with a thrust surface for contacting the first scroll; A lower frame positioned on the lower side of the upper frame, including an oil pocket portion where oil accumulates; and It includes a drainage hole formed by penetrating the side wall of the upper frame, and A scroll compressor in which the above drain hole is positioned such that the distance from the thrust surface is shorter than the distance from the bottom surface of the main frame.

2. In Paragraph 1, The upper frame includes an upper contact surface for contact with the lower frame, and The lower frame includes a lower contact surface for being attached to the upper frame, and A scroll compressor in which the upper contact surface and the lower contact surface are each formed as continuously connected planes and are in close contact with each other to block the entry and exit of oil.

3. In Paragraph 1, The upper frame comprises an upper body for contacting the lower frame, and a thrust member protruding upward from the upper body. The thrust surface is formed on the upper surface of the thrust member, and The above drainage hole is a scroll compressor formed by penetrating the side wall of the upper body.

4. In Paragraph 3, The above-mentioned drain hole is a scroll compressor positioned at a distance from the bottom surface of the upper body and a distance from the top surface of the upper body that are equal.

5. In Paragraph 3, A scroll compressor in which the above drain hole is positioned such that the distance from the upper surface of the upper body is shorter than the distance from the lower surface of the upper body.

6. In paragraph 1, the upper frame An upper body for contacting the lower frame above; A receiving groove formed on the bottom surface of the upper body; and A scroll compressor comprising a guide groove formed to communicate with each of the receiving groove and the drain hole, and guiding oil located in the receiving groove to flow toward the drain hole.

7. In Paragraph 6, A scroll compressor in which the above-mentioned guide groove is formed such that its depth increases as it extends from one side connected to the receiving groove to the other side connected to the drainage hole.

8. In Paragraph 6, A scroll compressor in which the above-mentioned guide groove is formed such that its width narrows as it extends from one side connected to the receiving groove to the other side connected to the drainage hole.

9. In Paragraph 6, The upper body includes a plurality of guide surfaces arranged on both sides of the guide groove based on the width direction of the guide groove, and A scroll compressor in which each of the above-mentioned guiding surfaces is formed to form a curved surface that extends from one side of the guiding groove to the other side of the guiding groove.

10. In Paragraph 9, Among the above-mentioned guiding surfaces, the outer guiding surface positioned outside the guiding groove is formed to form a curved surface based on a single center of curvature, and Among the above-mentioned guiding surfaces, the inner guiding surface positioned inside the guiding groove is formed to form a curved surface in which a first guiding surface based on a first center of curvature and a second guiding surface based on a second center of curvature are continuously connected. The first center of curvature and the second center of curvature are positioned on opposite sides of the inner guide plane.

11. In Paragraph 10, The first guide surface is positioned on one side of the guide groove, and A scroll compressor in which the second guide surface is positioned on the other side of the guide groove and formed to form a curved surface that bends toward the drain hole.

12. In Paragraph 1, The above mainframe includes a plurality of the above drainage holes, and A scroll compressor in which the above drainage holes are formed by penetrating the side wall of the upper frame at positions spaced apart from each other.

13. In Paragraph 1, It includes a drain pipe coupled to the upper frame to be connected to the drain hole, The above oil drain pipe is a scroll compressor that discharges oil flowing in through the above oil drain hole at a height lower than the above intake port.

14. In Paragraph 13, The above oil drain pipe includes an insertion member for being inserted into the oil drain hole, a connecting member coupled to the insertion member, a discharge member coupled to the connecting member for discharging oil introduced through the insertion member and the connecting member at a height lower than the suction port, and a flow hole for oil to flow through. The above insertion member includes an insertion inner surface positioned toward the fluid hole, and The above connecting member includes a connecting inner surface positioned to face the fluid hole, and The discharge member includes a discharge inner surface positioned toward the flow hole, and The insertion inner surface and the discharge inner surface are formed by extending in different directions from each other, and A scroll compressor in which the connecting inner surface is formed as a curved surface that is continuously connected to the insertion inner surface and the discharge inner surface, respectively.

15. For supporting the first scroll and the second scroll of the scroll compressor, An upper frame provided with a thrust surface for contacting the first scroll; A lower frame positioned on the lower side of the upper frame, including an oil pocket portion where oil accumulates; and It includes a drainage hole formed by penetrating the side wall of the upper frame, and The above drain hole is positioned at a location where the distance from the thrust surface is shorter than the distance from the bottom surface of the lower frame, in the main frame of the scroll compressor.

16. In Paragraph 15, The upper frame includes an upper contact surface for contact with the lower frame, and The lower frame includes a lower contact surface for adhering to the upper frame, and The upper contact surface and the lower contact surface are each formed as continuously connected planes and are in close contact with each other to block the entry and exit of oil, forming a main frame of a scroll compressor.

17. In Paragraph 15, The upper frame comprises an upper body for contacting the lower frame, and a thrust member protruding upward from the upper body. The thrust surface is formed on the upper surface of the thrust member, and The above drain hole is formed by penetrating the side wall of the upper body at a position where the distance from the bottom surface of the upper body and the distance from the top surface of the upper body are equal. This is the main frame of a scroll compressor.

18. In Paragraph 15, The upper frame comprises an upper body for contacting the lower frame, and a thrust member protruding upward from the upper body. The thrust surface is formed on the upper surface of the thrust member, and The above drain hole is formed by penetrating the side wall of the upper body at a position where the distance from the upper surface of the upper body is shorter than the distance from the bottom surface of the upper body.

19. In Clause 15, the upper frame is An upper body for contacting the lower frame above; A receiving groove formed on the bottom surface of the upper body; and A main frame of a scroll compressor comprising a guide groove formed to communicate with each of the receiving groove and the drain hole, and guiding oil located in the receiving groove to flow toward the drain hole.

20. In Paragraph 19, The main frame of a scroll compressor, wherein the above-mentioned guide groove is formed such that its depth increases and its width decreases as it extends from one side connected to the receiving groove to the other side connected to the drainage hole.

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