Scroll compressor

Abstract

A scroll compressor may be disclosed. The scroll compressor comprises a casing, a driving motor, a rotary shaft, a main frame, an orbiting scroll, and a fixed scroll, wherein a first oil groove is provided at the leading surface of a rotary shaft insertion part facing the fixed scroll, and an oil supply hole, in communication with the first oil groove, may be provided to the orbiting scroll on the side facing the main frame. Accordingly, a predetermined amount of oil can be rapidly and continuously provided to the leading surface of the rotary shaft insertion part forming the bearing surface to smoothly cool and / or lubricate the space between the rotary shaft insertion part of the orbiting scroll and the fixed end plate portion of the fixed scroll. Moreover, the leakage between the compression chambers can be controlled to increase compression efficiency and damage to the fixed wrap and / or bearing can also be controlled.

Description

scroll compressor

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

[0002] Compressors used in refrigeration cycles such as refrigerators and air conditioners compress refrigerant gas and transmit it to the condenser. Air conditioners primarily use rotary or scroll compressors. Scroll compressors are increasingly being used not only in air conditioners but also in water heater compressors, which require even higher compression ratios.

[0003] Scroll compressors can be divided into sealed scroll compressors in which the drive unit (or electric unit) and the compression unit are provided together inside the casing, and open scroll compressors in which the drive unit (or electric unit) is provided outside the casing and only the compression unit is provided inside the casing.

[0004] Scroll compressors can be categorized as upper compression or lower compression types based on the location of the drive motor and compression unit, which form the drive or transmission unit. Upper compression types have the compression unit positioned above the drive motor, while lower compression types have the compression unit positioned below the drive motor. This classification is based on examples where the casing is installed vertically or horizontally. When the casing is installed horizontally, the left side can be conveniently designated as the upper side and the right side as the lower side.

[0005] Scroll compressors can be categorized into low-pressure scroll compressors, in which the internal space of the casing equipped with a compression unit forms suction pressure, and high-pressure scroll compressors, in which the discharge pressure forms. Upper compression scroll compressors can be configured as low-pressure or high-pressure types, but lower compression scroll compressors are generally configured as high-pressure scroll compressors, taking into account the location of the refrigerant suction pipe.

[0006] High-pressure scroll compressors utilize the difference between the internal pressure of the casing and the internal pressure of the compression chamber (hereinafter referred to as differential pressure) to supply oil from the casing to the compression chamber, as the internal space of the casing generates discharge pressure. Consequently, high-pressure scroll compressors can simplify the use of oil pumps. Unless otherwise specified, scroll compressors are defined as bottom-compression compressors and high-pressure scroll compressors.

[0007] Conventionally, a through-shaft scroll compressor has been known in which a rotating shaft passes through a main frame, an orbiting scroll, and a fixed scroll and is connected in that order. The rotating shaft of such a through-shaft scroll compressor has a plurality of oil supply holes formed along the axial direction, each opening toward the main frame, the orbiting scroll, and the fixed scroll. Accordingly, oil sucked in during the rotation of the rotating shaft can pass through each oil supply hole by differential pressure and be supplied to each sliding part.

[0008] In the conventional shaft-through scroll compressor described above, some of the leading edges of the rotating shaft insertion portion are formed to be larger than the turning radius, which may prevent smooth oil flow. This may cause wear on the leading edges of the rotating shaft insertion portion and / or the corresponding fixed scroll, resulting in leakage of compressed refrigerant. This may further aggravate reliability degradation due to refrigerant leakage during high compression ratio operation, especially when the orbiting scroll is formed of a softer material than the fixed scroll.

[0009] In addition, conventional shaft-through scroll compressors may suffer from insufficient oil supply to the narrow portion of the front end face of the rotating shaft insert, resulting in reduced cooling and / or lubrication due to insufficient oil supply to that portion. This may result in damage to the fixed wrap or a portion of the rotating shaft insert, or damage to the bearings inserted in the rotating shaft insert, thereby reducing reliability.

[0010] In addition, considering this, if the amount of oil supplied to each wetted part is increased, the cooling capacity may be reduced or the oil discharge amount may increase due to excessive oil inflow into the compression chamber, which may lower reliability.

[0011] The purpose of the present invention is to provide a scroll compressor capable of preventing damage to a bearing inserted into a rotating shaft insertion portion of a fixed wrap and / or an orbiting scroll.

[0012] Another object of the present invention is to provide a scroll compressor capable of effectively cooling and / or lubricating a portion between a front end surface of a rotating shaft insert and a fixed scroll facing it.

[0013] Another object of the present invention is to provide a scroll compressor in which oil can be smoothly supplied between a front end surface of a rotating shaft insertion portion and a fixed scroll facing it.

[0014] Another object of the present invention is to provide a scroll compressor capable of smoothly supplying oil between a front end surface of a rotating shaft insertion portion and a fixed scroll facing it while preventing the oil from flowing into a compression chamber.

[0015] In order to achieve the object of the present invention, a scroll compressor including a casing, a driving motor, a rotating shaft, a main frame, an orbiting scroll, and a fixed scroll may be provided. An oil storage space may be provided inside the casing. The driving motor may be provided in the internal space of the casing. The rotating shaft may be coupled to a rotor of the driving motor, and an oil passage may be formed to absorb oil from the oil storage space. The main frame may be provided on one side of the driving motor. The orbiting scroll may have an orbiting plate portion facing the main frame, an orbiting wrap may be provided on one side of the orbiting plate portion, and a rotating shaft insertion portion into which the rotating shaft is inserted may be formed to penetrate the orbiting plate portion. The fixed scroll may have a fixed wrap engaged with the orbiting wrap to form a compression chamber together with the orbiting wrap. A first oil groove is formed on the front end surface of the rotation shaft insertion portion connecting the inner surface of the rotation shaft coupling portion facing the outer surface of the rotation shaft and the outer surface of the rotation shaft coupling portion facing the inner surface of the fixed wrap, and an oil supply hole communicating with the first oil groove may be formed on the orbiting scroll on the surface facing the main frame. Through this, a certain amount of oil can be quickly and continuously introduced into the front end surface of the rotation shaft insertion portion forming the bearing surface, thereby smoothly cooling and / or lubricating the space between the rotation shaft insertion portion of the orbiting scroll and the fixed plate portion of the fixed scroll. In addition, through this, leakage between compression chambers can be suppressed, thereby increasing compression efficiency and simultaneously suppressing damage to the fixed wrap and / or bearing.

[0016] For example, the first oil groove may be formed so that at least a portion thereof is located in a portion where the width from the inner circumference to the outer circumference of the rotary shaft insertion portion decreases. This allows oil to be smoothly supplied even to a portion of the front end of the rotary shaft insertion portion where the width is narrow, thereby more effectively cooling and / or lubricating the space between the rotary shaft insertion portion and the fixed plate portion.

[0017] In addition, the front end surface of the rotational shaft insertion portion may include a first portion, a second portion, and a third portion. The first portion may be provided on one side of the circular portion facing the discharge end of the fixed wrap, so that the width from the inner peripheral surface to the outer peripheral surface of the rotational shaft insertion portion may be enlarged. The second portion may extend from the first portion along the compression chamber, so that the width from the inner peripheral surface to the outer peripheral surface of the rotational shaft insertion portion may be reduced. The third portion may extend from the second portion along the compression chamber, so that the width from the inner peripheral surface to the outer peripheral surface of the rotational shaft insertion portion may be increased. The first oil groove may be formed so that at least a portion thereof is located within the second portion. Through this, the oil groove is formed over almost the entire area of ​​the front end surface of the rotational shaft insertion portion, thereby more effectively cooling and / or lubricating the space between the rotational shaft insertion portion and the fixed plate portion.

[0018] Specifically, a first sealing surface may be formed between the inner surface of the first oil groove and the inner surface of the rotary shaft insertion portion, and a second sealing surface may be formed between the outer surface of the first oil groove and the outer surface of the rotary shaft insertion portion. The first sealing surface and the second sealing surface may be symmetrical with the first oil groove interposed therebetween. Through this, the volume of the first oil groove may be formed as wide as possible, while the sealing area for the first oil groove may be secured as wide as possible, thereby suppressing excessive oil of the first oil groove from flowing into the compression chamber.

[0019] Alternatively, a second oil groove may be formed in the third portion, which is connected to the inner surface of the rotating shaft insert. The second oil groove may be separated from the first oil groove. As a result, oil flowing into the inner surface of the rotating shaft insert can be quickly introduced into the second oil groove by differential pressure and / or centrifugal force, thereby enhancing the cooling and / or lubricating effect in the third portion, which has a large bearing area.

[0020] More specifically, a third oil groove may be formed in the third portion, spaced apart from the inner surface of the rotary shaft insert. The third oil groove may be separated from the first oil groove and the second oil groove. Accordingly, even if the third oil groove is formed independently in the third portion, a certain amount of oil may be filled in the third oil groove, thereby further enhancing the cooling and / or lubricating effect in the third portion, which has a large bearing area.

[0021] Alternatively, a third oil groove may be formed in the third portion, spaced apart from the inner surface of the rotary shaft insert. The third oil groove may be connected to the first oil groove. Through this, oil guided through the oil supply hole may be supplied quickly and continuously to the third oil groove connected to the first oil groove, thereby more effectively cooling and / or lubricating the space between the rotary shaft insert and the fixed plate.

[0022] Alternatively, the first oil groove may be formed at least partially across the first portion and the third portion. This allows for smooth cooling and / or lubrication between the rotating shaft insert and the fixed plate portion facing it.

[0023] As another example, a sealing member may be provided between the main frame and one side of the pivot plate facing it to surround the periphery of the rotation shaft insertion portion. The oil supply hole may be formed to penetrate the space between the rotation shaft insertion portion and the sealing member. This allows the volume of the oil grooves to be formed as wide as possible while allowing oil to be quickly filled into each oil groove.

[0024] For example, the inner diameter of the second stage facing the fixed scroll may be formed smaller than the inner diameter of the first stage facing the main frame. This facilitates machining of the oil supply hole, while appropriately reducing the pressure of the oil passing through the oil supply hole, thereby minimizing the inflow of oil from the oil groove into the compression chamber.

[0025] Alternatively, a pressure reducing member may be provided inside the oil supply hole, and a blocking member may be provided at one of the two ends of the oil supply hole to prevent the pressure reducing member from coming off. This makes it possible to process the oil supply hole more easily while appropriately reducing the pressure of the oil passing through the oil supply hole, thereby minimizing the oil in the oil groove from flowing into the compression chamber.

[0026] Specifically, a refueling guide groove may be formed at one end of the two ends of the refueling hole so as to intersect the refueling hole. The refueling guide groove may be formed so as to be exposed to the outside of the blocking member. In this way, even if the blocking member is fastened to the refueling hole while the refueling guide groove is exposed to the outside of the blocking member, the refueling hole can be prevented from being blocked by the blocking member.

[0027] In order to achieve the object of the present invention, a scroll compressor including a casing, a driving motor, a rotating shaft, a main frame, an orbiting scroll, and a fixed scroll may be provided. An oil storage space may be provided inside the casing. The driving motor may be provided in the internal space of the casing. The rotating shaft may be coupled to a rotor of the driving motor, and an oil passage may be formed to absorb oil from the oil storage space. The main frame may be provided on one side of the driving motor. The orbiting scroll may have an orbiting plate portion facing the main frame, an orbiting wrap may be provided on one side of the orbiting plate portion, and a rotating shaft insertion portion into which the rotating shaft is inserted may be formed to penetrate the orbiting plate portion. The fixed scroll may have a fixed wrap engaged with the orbiting wrap to form a compression chamber together with the orbiting wrap. The outer circumference of the rotational shaft insertion portion facing the inner circumference of the fixed wrap may be provided with a first increase portion formed on one side of the circular portion facing the discharge end of the fixed wrap, and the width from the inner circumference to the outer circumference of the rotational shaft insertion portion facing the outer circumference of the rotational shaft is expanded, and a decrease portion may be formed extending from the first increase portion along the compression chamber and decreasing the width from the inner circumference to the outer circumference of the rotational shaft insertion portion, and a second increase portion may be formed extending from the decrease portion along the compression chamber and increasing the width from the inner circumference to the outer circumference of the rotational shaft insertion portion. An oil groove sunken to a preset depth may be formed on at least a portion of the front end surface of the rotational shaft insertion portion belonging to the second increase portion. Through this, a certain amount of oil may be continuously maintained on the front end surface of the rotational shaft insertion portion forming the bearing surface, so that the space between the rotational shaft insertion portion of the orbiting scroll and the fixed plate portion of the fixed scroll can be smoothly cooled and / or lubricated. Additionally, this can suppress leakage between compression chambers, thereby increasing compression efficiency, while preventing damage to the fixed wrap and / or bearings.

[0028] For example, the oil groove may be formed so that at least a portion of the oil groove is positioned within the reduction portion. This allows the oil groove to be formed across almost the entire front end surface of the rotary shaft insert, thereby more effectively cooling and / or lubricating the space between the rotary shaft insert and the fixed plate.

[0029] As another example, the above-described orbiting scroll may have an oil supply hole formed on the other side of the orbiting plate portion facing the main frame, penetrating through the front end surface of the rotary shaft insert portion and communicating with the oil groove. This allows oil to be supplied to the oil groove rapidly and continuously, thereby more effectively cooling and / or lubricating the space between the rotary shaft insert portion and the fixed plate portion.

[0030] As another example, the oil groove may be formed such that at least a portion thereof extends from the first increasing portion to the second increasing portion, and the inner surface of the oil groove may be connected to the inner surface of the rotary shaft insert portion. Accordingly, oil may be supplied to each oil groove even without forming a separate oil supply hole, thereby facilitating the machining of the orbiting scroll while effectively cooling and / or lubricating the space between the rotary shaft insert portion and the fixed plate portion.

[0031] A scroll compressor according to the present invention comprises a casing, a driving motor, a rotating shaft, a main frame, an orbiting scroll, and a fixed scroll, wherein a first oil groove is formed on a front end surface of a rotating shaft insertion portion facing the fixed scroll, and an oil supply hole may be formed on the orbiting scroll on a surface facing the main frame and communicating with the first oil groove. Through this, a certain amount of oil can be rapidly and continuously introduced into the front end surface of the rotating shaft insertion portion forming a bearing surface, thereby smoothly cooling and / or lubricating the space between the rotating shaft insertion portion of the orbiting scroll and the fixed plate portion of the fixed scroll. In addition, through this, leakage between compression chambers can be suppressed, thereby increasing compression efficiency, and at the same time, damage to the fixed wrap and / or bearing can be suppressed.

[0032] A scroll compressor according to the present invention has a second oil groove formed on the front end surface of a rotary shaft insertion portion and communicating with the inner circumference of the rotary shaft insertion portion, wherein the second oil groove can be separated from the first oil groove. Through this, oil flowing into the inner circumference of the rotary shaft insertion portion can be quickly introduced into the second oil groove by differential pressure and / or centrifugal force, thereby enhancing the cooling and / or lubricating effect in the third portion having a large bearing area.

[0033] A scroll compressor according to the present invention has a third oil groove formed on the leading edge of a rotary shaft insertion portion and spaced apart from the inner circumference of the rotary shaft insertion portion, wherein the third oil groove can be connected to the first oil groove. Through this, oil guided through the oil supply hole can be supplied quickly and continuously to the third oil groove connected to the first oil groove, thereby more effectively cooling and / or lubricating the space between the rotary shaft insertion portion and the fixed plate portion.

[0034] A scroll compressor according to the present invention comprises a sealing member that surrounds a periphery of a rotary shaft insertion portion between a main frame and one side of a rotating plate portion facing the main frame, and an oil supply hole that can be formed to penetrate the space between the rotary shaft insertion portion and the sealing member. This allows the volume of the oil grooves to be formed as wide as possible while allowing oil to be quickly filled into each oil groove.

[0035] Fig. 1 is a cross-sectional view showing the inside of a scroll compressor according to the present embodiment.

[0036] Figure 2 is an exploded perspective view showing an example of an oil groove and an oil supply hole.

[0037] Fig. 3 is a plan view showing an example of the oil groove in Fig. 2.

[0038] Fig. 4 is a plan view showing an example of the location of the fueling hole in Fig. 2.

[0039] Figure 5 is a cross-sectional view taken along the line “Ⅴ-Ⅴ” of Figure 4.

[0040] Fig. 6 is a cross-sectional view illustrating the oil flow state in the oil groove and oil supply hole according to the present embodiment.

[0041] Fig. 7 is a plan view showing another embodiment of an oil groove.

[0042] Fig. 8 is a plan view showing another embodiment of an oil groove.

[0043] Fig. 9 is a plan view showing another embodiment of an oil groove.

[0044] Fig. 10 is a plan view showing another embodiment of a fueling hole.

[0045] Fig. 11 is a cross-sectional view taken along line “XI-XI” of Fig. 10.

[0046] Hereinafter, a scroll compressor according to the present invention will be described in detail with reference to the attached drawings. In the following description, descriptions of some components may be omitted to clarify the features of the present invention.

[0047] In addition, the term "upper side" used in the following description means the direction away from the support surface supporting the scroll compressor according to the embodiment of the present invention, that is, the upper side toward the drive unit (power unit or drive motor) when looking at the drive unit (power unit or drive motor) and the compression unit in the center. The term "lower side" means the direction approaching the support surface, that is, the lower side toward the compression unit when looking at the drive unit (power unit or drive motor) and the compression unit in the center.

[0048] Additionally, the term "axial" used in the following description refers to the longitudinal direction of the axis of rotation. "Axial" can be understood as the vertical direction. "Radial" refers to the direction intersecting the axis of rotation.

[0049] In addition, in the following description, the scroll compressor is described as a sealed scroll compressor in which the drive unit (electric unit or drive motor) and the compression unit are provided in the casing. However, the same can be applied to an open compressor in which the drive unit (electric unit or drive motor) is provided outside the casing and connected to the compression unit provided inside the casing.

[0050] In addition, the following description will be given as an example a lower compression type scroll compressor in which the drive unit and the compression unit are arranged in the vertical axial direction and the compression unit is located lower than the drive unit (the drive unit or the drive motor). However, the same can be applied to a horizontal scroll compressor in which the drive unit (the drive unit or the drive motor) and the compression unit are arranged left and right, as well as an upper compression type scroll compressor in which the compression unit is located higher than the drive unit (the drive unit or the drive motor).

[0051] In addition, the following description takes as an example a high-pressure scroll compressor having a lower compression type and a refrigerant suction pipe forming a suction passage directly connected to a compression section, and a refrigerant discharge pipe connected to the internal space of the casing so that the internal space of the casing forms a discharge pressure.

[0052] Fig. 1 is a cross-sectional view showing a scroll compressor according to the present embodiment.

[0053] Referring to FIG. 1, a high-pressure, bottom-compression scroll compressor (hereinafter, abbreviated as a scroll compressor) according to the present embodiment is provided with a drive motor (120) forming an electric part in the upper half of a casing (110), and a main frame (130), an orbiting scroll (140), a fixed scroll (150), and a discharge cover (160) may be provided on the lower side of the drive motor (120). Typically, the drive motor (120) forms an electric part as described above, and the main frame (130), the orbiting scroll (140), the fixed scroll (150), and the discharge cover (160) may form a compression part (C).

[0054] The drive motor (120) forming the electric part is coupled to the upper end of the rotation shaft (125) to be described later, and the compression part (C) can be coupled to the lower end of the rotation shaft (125). Accordingly, the compressor has the lower compression structure described above, and the compression part (C) is connected to the drive motor (120) by the rotation shaft (125) and can be operated by the rotational force of the drive motor (120). Therefore, the drive motor (120) can be understood as a drive part that drives the compression part (C), and thus, in the following description, the drive motor can be used interchangeably as the electric part or the drive part.

[0055] Referring to FIG. 1, the casing (110) according to the present embodiment may include a cylindrical shell (111), an upper shell (112), and a lower shell (113). The cylindrical shell (111) has a cylindrical shape with both upper and lower ends open, the upper shell (112) may be coupled to cover the opened upper end of the cylindrical shell (111), and the lower shell (113) may be coupled to cover the opened lower end of the cylindrical shell (111). Accordingly, the internal space (not symbolized) of the casing (110) is sealed, and the sealed internal space of the casing (110) may be separated into a lower space (S1) and an upper space (S2) based on the driving motor (120).

[0056] The lower space (S1) is a space formed on the lower side of the driving motor (120), and the lower space (S1) can be divided into a storage space (S11) and a discharge space (S12) based on the compression section (C).

[0057] The upper space (S2) is a space formed above the driving motor (120) and forms an oil separation space in which oil is separated from the refrigerant discharged from the compression unit (C). A refrigerant discharge pipe (116), which will be described later, can be connected to the upper space (S2).

[0058] The aforementioned driving motor (120) and main frame (130) can be inserted and fixed inside the cylindrical shell (111). An oil recovery passage (not shown) can be formed on the outer surface of the driving motor (120) and the outer surface of the main frame (130) at a predetermined interval from the inner surface of the cylindrical shell (111).

[0059] A refrigerant suction pipe (115) can be connected by penetrating the side of the cylindrical shell (111). Accordingly, the refrigerant suction pipe (115) can be connected by penetrating the cylindrical shell (111) forming the casing (110) in the radial direction.

[0060] The upper part of the upper shell (112) can be connected to the inner space (not shown) of the casing (110), specifically, the upper space (S2) formed on the upper side of the driving motor (120), by penetrating the inner end of the refrigerant discharge pipe (116).

[0061] One end of an oil circulation pipe (not shown) may be radially connected to the lower half of the lower shell (113). The oil circulation pipe is open at both ends, and the other end of the oil circulation pipe may be connected to the refrigerant suction pipe (115). An oil circulation valve (not shown) may be installed in the middle of the oil circulation pipe.

[0062] Referring to FIG. 1, the driving motor (120) according to the present embodiment may include a stator (121) and a rotor (122). The stator (121) may be inserted and fixed into the inner surface of the cylindrical shell (111), and the rotor (122) may be rotatably provided inside the stator (121).

[0063] The stator (121) may include a stator core (1211) and a stator coil (1212).

[0064] The stator core (1211) is formed in an annular or hollow cylindrical shape and can be fixed to the inner surface of the cylindrical shell (111) by hot pressing.

[0065] The stator coil (1212) is wound around the stator core (1211) and can be electrically connected to an external power source through a power cable (not shown) that penetrates the casing (110).

[0066] The rotor (122) may include a rotor core (1221) and a permanent magnet (1222).

[0067] The rotor core (1221) can be rotatably inserted into the stator core (1211) at a predetermined gap (not shown). The permanent magnet (1222) can be embedded in the rotor core (1221) at a predetermined gap along the circumference.

[0068] A rotation shaft (125) may be coupled to the center of the rotor core (1221). The upper end of the rotation shaft (125) may be press-fitted and coupled to the rotor (122), and the lower end of the rotation shaft (125) may be rotatably inserted into the main frame (130) and supported in the radial direction. Accordingly, the rotation shaft (125) transmits the rotational force of the driving motor (120) to the orbiting scroll (140) forming the compression section (C), so that the orbiting scroll (140) eccentrically coupled to the rotation shaft (125) may perform a rotational movement with respect to the fixed scroll (150).

[0069] For example, the rotation shaft (125) may be composed of a main shaft portion (1251), a main bearing surface portion (1252), an eccentric portion (1253), and a sub-bearing surface portion (1254). The main shaft portion (1251) is a portion coupled to the rotor (122), the main bearing surface portion (1252) is a portion supported radially by a main frame (130) to be described later, the eccentric portion (1253) is a portion eccentrically inserted into and rotatably coupled to a turning scroll (140) to be described later, and the sub-bearing surface portion (1254) is a portion supported radially by a fixed scroll (150) to be described later. In other words, the rotating shaft (125) has a main shaft portion (1251) forming one end coupled to the rotor (122), and the main bearing surface portion (1252), the eccentric portion (1253), and the western bearing surface portion (1254) forming the other end can be coupled by penetrating the main frame (130), the orbiting scroll (140), and the fixed scroll (150), respectively.

[0070] In this case, since the outer diameter of the sub-bearing surface portion (1254) is formed smaller than the outer diameter of the eccentric portion (1253), the bearing surface pressure between the sub-bearing surface portion (1254) and the sub-bearing (hereinafter, used interchangeably with the fixed shaft hole) (1532) that faces it in the radial direction may significantly increase. Accordingly, a concentric bushing (127) forming a part of the sub-bearing surface portion (1254) may be inserted between the sub-bearing surface portion (1254) and the sub-bearing (1532). For example, the concentric bushing (127) may be press-fitted onto the outer circumferential surface of the sub-bearing surface portion (1254) or may be fixedly coupled using a separate fixing member. Accordingly, the actual outer diameter of the sub-bearing surface (1254) increases, thereby reducing the surface pressure between the sub-bearing surface (or bushing bearing) (1254) and the sub-bearing (1532).

[0071] Inside the rotating shaft (125), an oil passage (126) is formed in an axial or inclined direction to guide oil stored in the oil storage space (S11) of the casing (110) to the compression chamber (V) and / or bearing surface, and an oil pickup (128) for pumping oil filled in the oil storage space (S11) can be coupled to the lower end of the oil passage (126).

[0072] In addition, a plurality of oil holes (1261) may be formed in the middle of the oil channel (126) so that the oil sucked through the oil channel (126) is supplied to each bearing surface. For example, the oil hole (1261) may be formed of a first oil hole (1261) that penetrates the outer surface of the main bearing surface (1252) at the upper part of the oil channel (126), a second oil hole (1262) that penetrates the outer surface of the eccentric portion (1253) at the middle part of the oil channel (126), and a third oil hole (1263) that penetrates the outer surface of the sub-bearing surface (1254) and the concentric bushing (127) at the lower part of the oil channel (126). Accordingly, the oil stored in the oil storage space (S11) is sucked along the rotation shaft (125) through the oil pickup (128) and the oil passage (126) when the rotation shaft (125) rotates, and is supplied to each bearing surface through each oil hole (1261), (1262), and (1263), and some of it is returned to the oil storage space (S11) and some of it can be supplied to the compression chamber (V). The flow state of the oil stored in the oil storage space (S11) will be described later together with the oil groove (181), etc.

[0073] The compression unit (C) according to the present embodiment may include a main frame (130), a rotating scroll (140), and a fixed scroll (150). The main frame (130) is fixedly connected to the lower side of the driving motor (120), and the rotating scroll (140) is axially supported by a fixed scroll (150) connected to the lower side of the main frame (130) and may be provided to be rotatable between the main frame (130) and the fixed scroll (150).

[0074] Referring to FIG. 1, the main frame (130) may include a frame plate portion (131), a frame side wall portion (132), and a main support portion (133).

[0075] The frame plate portion (131) is formed in a circular shape, and a main shaft hole (1331) forming a main support portion (133) to be described later can be formed axially through the center.

[0076] The frame side wall portion (132) extends in a cylindrical shape from the lower edge of the frame plate portion (131) and can be fixed by hot pressing or welding to the inner surface of the cylindrical shell (111).

[0077] The main support member (133) may be formed by having a main shaft hole (1331) extending axially therethrough so that the rotary shaft (125) may be rotatably inserted therein. A main bearing (not shown) that supports the main bearing surface portion (1252) of the rotary shaft (125) may be provided in the main shaft hole (1331). Accordingly, the main bearing surface portion (1252) of the rotary shaft (125) may be supported radially while smoothly rotating within the main shaft hole (1331).

[0078] Referring to FIG. 1, the turning scroll (140) may include a turning plate portion (141), a turning wrap (142), and a rotating shaft insert portion (143).

[0079] The pivot plate (141) is formed in a circular shape and can be accommodated between the frame pivot plate (131) and the fixed pivot plate (151) to be described later. The upper surface of the pivot plate (141) facing the main frame (130) can be axially supported with a back pressure sealing member (145) interposed between the lower surface of the frame pivot plate (131). Accordingly, a back pressure chamber (Sp) can be formed between the upper surface of the pivot plate (141) and the frame pivot plate (131) facing it.

[0080] The back pressure chamber (Sp) can be separated from the intermediate pressure chamber (Sm) via the back pressure sealing member (145) described above. The back pressure chamber (Sp) is connected to the oil storage space (S11) through the first oil hole (1261) and / or the second oil hole (1262) of the rotating shaft (125) to form discharge pressure or near discharge pressure, whereas the intermediate pressure chamber (Sm) is connected to the compression chamber (V) forming the intermediate pressure through the intermediate pressure passage (155) provided in the fixed scroll (150) to form the intermediate pressure. Accordingly, the orbiting scroll (140) can be pressurized toward the fixed scroll (150) at the center by the back pressure forming the discharge pressure, and at the edge by the back pressure forming the intermediate pressure. The back pressure chamber (Sp) will be described again later together with the oil supply hole (182).

[0081] The pivoting wrap (142) extends from the lower surface of the pivoting plate portion (141) toward the fixed plate portion (151) to be described later, and can pivot by engaging with the fixed wrap (154) to be described later. Accordingly, the pivoting wrap (142) can form the first compression chamber (V1) and the second compression chamber (V2) described above together with the fixed wrap (154).

[0082] The orbital wrap (142) may be formed in an involute shape. However, the orbital wrap (142) may be formed in various shapes other than an involute shape together with the fixed wrap (154). For example, the orbital wrap (142) may have a shape in which multiple circular arcs with different diameters and origins are connected, and the outermost curve may be formed in a roughly elliptical shape having a major axis and a minor axis. The fixed wrap (154) may also be formed in the same manner. This may be defined as a hybrid or irregular wrap shape, and the present embodiment illustrates an example in which the orbital wrap (142) is formed in a hybrid shape.

[0083] The rotary shaft insertion portion (143) can be formed by penetrating axially from the center of the turning plate portion (141). Accordingly, the discharge port (1511) described later can be formed at the center of the turning scroll (140), that is, at an eccentric position from the rotary shaft insertion portion (143).

[0084] A rotary shaft (125) can be rotatably inserted and coupled into the rotary shaft insertion portion (143). Accordingly, the outer circumference (143b) of the rotary shaft insertion portion (143) can form a part of the rotary wrap (142) and, together with the inner circumference of the fixed wrap (154), form a first compression chamber (V1).

[0085] Specifically, the outer surface (143b) of the rotary shaft insertion portion (143) may be formed with a concave portion (1432), a first increasing portion (1433), a decreasing portion (1434), and a second increasing portion (1435) in succession along the formation direction of the compression chamber (V), that is, the wrap formation direction formed by the outer surface of the rotating wrap (142), with the circular portion (1431) as the starting point. The circular portion (1431) may be formed to face the discharge end of the fixed wrap (154) to be described later, and the concave portion (1432) may be formed concavely so as to engage with the wrap protrusion (1541) of the fixed wrap (154) to be described later on one side of the circular portion (1431). The first increase portion (1433) may be formed on the upstream side along the formation direction of the compression chamber (V) by extending from one side of the concave portion (1432), the decrease portion (1434) may be formed on the upstream side along the formation direction of the compression chamber (V) by extending from one side of the first increase portion (1433), and the second increase portion (1435) may be formed on the upstream side along the formation direction of the compression chamber (V) by extending from one side of the decrease portion (1434).

[0086] Among these circular portions (1431), concave portions (1432), first increasing portions (1433), decreasing portions (1434) and second increasing portions (1435), the width between the circular portions (1431) and the second increasing portions (1435) from the inner circumference (143a) of the rotating shaft insertion portion (143) facing the outer circumference of the rotating shaft (125) to the outer circumference (143b) facing the inner circumference of the fixed wrap (154) (hereinafter, the width of the rotating shaft insertion portion) is formed relatively wide, and the concave portions (1432) can be formed so that the width of the rotating shaft insertion portion (143) is relatively narrow. The first increasing portion (or first part) (1433) may be formed to increase the width of the rotation shaft insertion portion (143), the decreasing portion (or second part) (1434) may be formed to decrease the width of the rotation shaft insertion portion (143), and the second increasing portion (or third part) (1435) may be formed to increase the width of the rotation shaft insertion portion (143). Accordingly, not only is the compression ratio of the first compression chamber (V1) and the second compression chamber (V2) improved, but also the thickness of the orbital wrap around the circular portion (1431) is increased, so that durability can be secured.

[0087] In this case, at least one oil groove (181) is formed on the front end surface (143c) of the rotary shaft insertion portion (143) connecting the inner surface (143a) of the rotary shaft insertion portion (143) and the outer surface (143b) of the rotary shaft insertion portion (143), and an oil supply hole (182) connected to the first oil hole (1261) and / or the second oil hole (1262) of the rotary shaft (125) may be formed inside some of the oil grooves (1811) among the at least one oil groove (181). Accordingly, as with the orbiting wrap, a certain amount of oil flows into and is stored in the front end face (143c) of the rotating shaft insertion part (143) that forms a bearing surface by contacting the fixed plate part (151) described later, thereby smoothly cooling and / or lubricating the space between the rotating shaft insertion part (143) of the orbiting scroll (140) and the fixed plate part (151) of the fixed scroll (150). The oil groove and / or oil supply hole will be described later.

[0088] Referring to FIG. 1, a fixed scroll (150) according to the present embodiment may include a fixed plate portion (151), a fixed side wall portion (152), a sub-support portion (153), and a fixed wrap (154).

[0089] The fixed plate part (151) may be formed in a circular shape and may be arranged at a preset interval on the lower side of the frame plate part (131). A sub-axial hole (1531) forming a sub-support part (153) to be described later may be formed through the center of the fixed plate part (151) in the vertical direction. A discharge port (1511) may be formed around the sub-axial hole (1531) to communicate with the first compression chamber (V1) and the second compression chamber (V2) to be described later, respectively, through which the compressed refrigerant is discharged to the muffler space (160a) of the discharge cover (160).

[0090] The fixed side wall portion (152) may extend in the vertical direction from the upper edge of the fixed plate portion (151) and be coupled to the frame side wall portion (132) of the main frame (130). An intake port (not shown) that penetrates the fixed side wall portion (152) in the radial direction may be formed in the fixed side wall portion (152). As described above, an end of a refrigerant suction pipe (115) that penetrates the cylindrical shell (111) may be inserted and coupled to the intake port.

[0091] A cylindrical sub-axis hole (1531) may be formed axially through the center of the sub-support member (153). The sub-axis hole (1531) may be formed on the same axis as the main axis hole (1331) provided in the main frame (130). Accordingly, the inner diameter of the sub-axis hole (1531) may be formed smaller than the inner diameter of the main axis hole (1331).

[0092] The fixed wrap (154) is formed to extend axially from the upper surface of the fixed plate portion (151) toward the orbiting scroll (140), and may be formed to correspond to the shape of the orbiting wrap (142) described above. In other words, the fixed wrap (154) has a shape in which a plurality of circular arcs having different diameters and origins are connected, and the outermost curve may be formed in an approximately elliptical shape having a major axis and a minor axis. Accordingly, a first compression chamber (V1) and a second compression chamber (V2) whose volumes become narrower toward the center may be formed between the fixed wrap (154) and the orbiting wrap (142).

[0093] For example, the inner end (near the discharge end) of the fixed wrap (154) may include a wrap projection (1541), a first wrap reduction portion (1542), a wrap increase portion (1543), and a second wrap reduction portion (1544). The wrap projection (1541) may be formed to correspond to the concave portion (1432) of the rotation shaft insertion portion (143), the first wrap reduction portion (1542) may be formed to correspond to the first increase portion (1433) of the rotation shaft insertion portion (143), the wrap increase portion (1543) may be formed to correspond to the decrease portion (1434) of the rotation shaft insertion portion (143), and the second wrap reduction portion (1544) may be formed to correspond to the second increase portion (1435) of the rotation shaft insertion portion (143). Accordingly, the compression ratio of the first compression chamber (V1) and the second compression chamber (V2) can be increased, while the inner end of the fixed wrap (154) can be thickened, thereby improving the wrap strength of the fixed wrap (154).

[0094] Referring to Fig. 1, a discharge cover (160) can be coupled to the back surface of a fixed scroll (150). A muffler space (160a) is provided inside the discharge cover (160), and a discharge port (1511) penetrating through the fixed scroll (150) can be accommodated in the muffler space (160a). Accordingly, refrigerant discharged from the compression chamber (V) through the discharge port (1511) can move to the upper space (S2) via the muffler space (160a).

[0095] The unexplained symbol 170 in the drawing is Oldham Ring.

[0096] The scroll compressor according to the present embodiment as described above can be operated as follows.

[0097] That is, when power is applied to the drive motor (120), rotational force is generated in the rotor (122) and the rotation shaft (125), causing them to rotate, and the rotary scroll (140) eccentrically coupled to the rotation shaft (125) performs a rotational movement with respect to the fixed scroll (150) by the Oldham ring (170).

[0098] Then, the volume of the first compression chamber (V1) and the second compression chamber (V2) gradually decreases from the outside of each compression chamber (V1) (V2) toward the center. Then, the refrigerant is sucked into the first compression chamber (V1) and the second compression chamber (V2) through the refrigerant suction pipe (115) and is compressed while moving along the movement path of each compression chamber (V1) (V2), and the compressed refrigerant can be discharged into the muffler space (160a) of the discharge cover (160) through the discharge port (1511) connected to the compression chamber (V1) (V2).

[0099] Then, the refrigerant may be discharged through the discharge hole (not shown) provided in the fixed scroll (150) and the main frame (130) into the discharge space (S12) between the main frame (130) and the drive motor (120), and may pass through the drive motor (120) to move to the upper space (S2) of the casing (110) formed on the upper side of the drive motor (120). The refrigerant may be separated into refrigerant and oil in the upper space (S2), and the refrigerant may be discharged to the outside of the casing (110) through the refrigerant discharge pipe (116), while the oil separated from the refrigerant may be recovered to the lower space (S1) of the casing (110) through the oil recovery passage (not shown) described above. This oil may be supplied to the compression chamber (V) and / or each bearing surface through the oil passage (126) and oil holes (1261), (1262), and (1263) of the rotating shaft (125) and then returned to the lower space (S1) of the casing (110) forming the oil storage space (S11), a series of processes may be repeated.

[0100] At this time, a portion of the oil flowing between the eccentric portion (1253) of the rotary shaft (125) and the rotary shaft insertion portion (143) of the orbiting scroll (140) flows into the bearing surface between the rotary shaft insertion portion (143) and the fixed plate portion (151) facing it, thereby cooling and / or lubricating the bearing surface between the rotary shaft insertion portion (143) and the fixed plate portion (151) as well as the bearing inserted into the rotary shaft insertion portion (143).

[0101] However, in a scroll compressor of a rotating back pressure type such as the present embodiment, the rotating scroll (140) may be excessively pressurized toward the fixed scroll (150) due to the high back pressure, causing the scrolls (140) (150) on both sides to be excessively close together. Then, the oil sucked through the oil passage (126) and oil hole of the rotating shaft (125) may not smoothly flow between the front end (143c) of the rotating shaft insertion portion (143) and the fixed plate portion (151) facing it. As a result, the space between the rotating shaft insertion portion (143) and the fixed plate portion (151) may not be cooled and / or lubricated, causing the rotating shaft insertion portion (143) to wear out or the bearing inserted into the rotating shaft insertion portion (143) as well as the fixed wrap (154) to be damaged.

[0102] Accordingly, in the present embodiment, an oil groove (181) is formed on the leading edge (143c) of the rotary shaft insertion portion (143), and the oil groove (181) is formed over most of the leading edge (143c) of the rotary shaft insertion portion (143), so that the space between the rotary shaft insertion portion (143) and the fixed plate portion (151) facing it can be smoothly cooled and / or lubricated. In addition, an oil supply hole (182) communicating with the oil groove (181) is formed in the orbiting scroll (140), so that oil can be supplied to the oil groove (181) quickly and continuously.

[0103] FIG. 2 is an exploded perspective view showing an example of an oil groove and an oil supply hole, FIG. 3 is a plan view showing an example of an oil groove in FIG. 2, FIG. 4 is a plan view showing an example of a location of an oil supply hole in FIG. 2, FIG. 5 is a cross-sectional view taken along line “Ⅴ-Ⅴ” of FIG. 4, and FIG. 6 is a cross-sectional view showing an oil flow state in an oil groove and an oil supply hole according to the present embodiment.

[0104] Referring to FIGS. 2 to 5, the front end surface (143c) of the rotary shaft insertion portion (143) according to the present embodiment can be formed as a concave portion (1432), a first increasing portion (1433), a decreasing portion (1434), and a second increasing portion (1435) along the formation direction of the compression chamber (V) with the circular portion (1431) as the starting point, as described above. In other words, the front end surface (143c) of the rotation shaft insertion portion (143) is formed with a concave portion (1432), a first increasing portion (1433), a decreasing portion (1434), and a second increasing portion (1435) in succession on one side of the circular portion (1431), but the width of the front end surface (143c) of the rotation shaft insertion portion (143) is formed to be relatively small in the concave portion (1432) and the decreasing portion (1434), and the width of the front end surface (143c) of the rotation shaft insertion portion (143) is formed to be relatively large in the first increasing portion (1433) and the second increasing portion (1435).

[0105] In this case, the oil groove (181) may be formed so that at least a portion thereof is located within the range of the reduction portion (1434). For example, one end of the oil groove (181) may be included in the first increase portion (1433), and the other end of the oil groove (181) may be formed so that it is included in the second increase portion (1435). Accordingly, at least a portion of the oil groove (181) may be formed in an arc shape across the entire reduction portion (1434) at the front end surface (143c) of the rotation shaft insertion portion (143).

[0106] Specifically, the oil groove (181) may include a first oil groove (1811), a second oil groove (1812), and a third oil groove (1813). In this case, the first oil groove (1811), the second oil groove (1812), and the third oil groove (1813) may be formed to be spaced apart from each other. For example, the first oil groove (1811) may be formed so that at least a portion thereof is included in the first increasing portion (1433) or crosses the decreasing portion (1434), the second oil groove (1812) may be formed so as to be included in the second increasing portion (1435), and the third oil groove (1813) may be formed so as to be included in the second increasing portion (1435) on the opposite side of the first oil groove (1811) with the second oil groove (1812) therebetween.

[0107] In this case, the first oil groove (1811) is connected to the back pressure chamber (Sp) through the oil supply hole (182) described later, the second oil groove (1812) is formed to be directly connected to the rotary shaft insertion portion (143), and the third oil groove (1813) can be formed separately from the back pressure chamber (Sp) as well as the rotary shaft insertion portion (143). Accordingly, the volume of the oil groove (181) can be formed as wide as possible while allowing oil to be quickly filled into each oil groove (181).

[0108] Referring to FIGS. 2 and 3, the first oil groove (1811) may be formed such that both ends thereof cross the reduction portion (1434) and are included in the first increase portion (1433) and the second increase portion (1435), respectively. In other words, the first oil groove (1811) is formed in an approximately circular arc shape when projected in the axial direction, but the cross-sectional area of ​​the first oil groove (1811) may be formed differently along the circumferential direction. For example, the cross-sectional areas of the first oil groove (1811) in the first increase portion (1433) and the second increase portion (1435) may be formed relatively wide, and the cross-sectional area of ​​the first oil groove (1811) in the reduction portion (1434) may be formed relatively narrow. Accordingly, the first oil groove (1811) is formed across the first increase portion (1433), the decrease portion (1434), and the second increase portion (1435) among the front end surface (143c) of the rotary shaft insertion portion (143), and the inner sealing surface (e.g., the first sealing surface) (143d) and the outer sealing surface (e.g., the second sealing surface) (143e) of the first oil groove (1811) can be formed identically. Through this, the volume of the first oil groove (1811) can be formed as wide as possible, while the sealing area for the first oil groove (1811) can be secured as wide as possible, thereby suppressing excessive oil from the first oil groove (1811) from flowing into the compression chamber.

[0109] Referring to FIGS. 4 to 6, the oil supply hole (182) may be formed to penetrate into the oil groove (181) from one side of the orbiting scroll (140) facing the main frame (130), that is, from the upper surface of the orbiting plate portion facing the frame plate portion. Accordingly, oil flowing between the main frame (130) and the orbiting scroll (140) can be quickly and continuously introduced into the oil groove (181) through the oil supply hole (182).

[0110] For example, the oil supply hole (182) may be formed to communicate with the back pressure chamber (Sp), which has a relatively high pressure among the intermediate pressure chamber (Sm) and the back pressure chamber (Sp) formed between the main frame (130) and the orbiting scroll (140), toward the oil groove (181). Accordingly, the oil in the back pressure chamber (Sp) can be more quickly and continuously introduced toward the oil groove (181) due to the differential pressure between the back pressure chamber (Sp) and the oil groove (181).

[0111] In this case, the oil supply hole (182) may be formed in multiple stages. For example, the oil supply hole (182) may be formed in a shape in which the inner surface is stepped in two stages. In other words, the inner diameter of the first hole portion (1821) that is connected to the back pressure chamber (Sp) and forms the inlet of the oil supply hole (182) may be formed large, while the inner diameter of the second hole portion that is connected to the oil groove (181) and forms the outlet of the oil supply hole (182) may be formed small. In addition, in this case, the length (L1) of the first hole portion (1821) may be formed to be longer than or equal to the length (L2) of the second hole portion (1822). Accordingly, while facilitating processing of the oil supply hole (182), the pressure of the oil passing through the oil supply hole (182) may be appropriately reduced, thereby minimizing the oil in the oil groove (181) from flowing into the compression chamber.

[0112] Referring to FIGS. 2 and 3, the second oil groove (1812) is formed separately from the first oil groove (1811) in the second increase portion (1435) as described above, and may be formed such that the inner circumference of the second oil groove (1812) is opened to the inner circumference (143a) of the rotary shaft insert portion (143). Accordingly, oil flowing into the inner circumference of the rotary shaft insert portion (143) can be quickly introduced into the second oil groove (1812) by differential pressure and / or centrifugal force. This can enhance the cooling and / or lubricating effect in the second increase portion (1435) with a large bearing area.

[0113] Referring to FIGS. 2 and 3, the third oil groove (1813) is formed by being separated from the first oil groove (1811) and the second oil groove (1812) in the second increase portion (1435) as described above, but the inner circumference of the third oil groove (1813) may be formed so as to be spaced apart from the inner circumference (143a) of the rotary shaft insertion portion (143). Accordingly, oil applied to the fixed plate portion (151) facing the front end surface (143c) of the rotary shaft insertion portion (143) may flow into the third oil groove (1813). Through this, even if the third oil groove (1813) is formed independently from the second increase portion (1435), a certain amount of oil is filled into the third oil groove (1813), thereby further enhancing the cooling and / or lubricating effect in the second increase portion (1435) with a large bearing area.

[0114] As described above, in this embodiment, a plurality of oil grooves (181) are formed on the leading edge surface (143c) of the rotary shaft insertion portion (143), and the oil grooves (181) may be formed not only on the second increasing portion (1435) in which the leading edge surface (143c) of the rotary shaft insertion portion (143) has a relatively wide width, but also on the first increasing portion (1433) and / or decreasing portion (1434) in which the leading edge surface (143c) of the rotary shaft insertion portion (143) has a relatively narrow width. Accordingly, the oil grooves (181) are formed on most of the leading edge surface (143c) of the rotary shaft insertion portion (143) facing the fixed plate portion (151), thereby further enhancing the cooling and / or lubricating effect between the rotary shaft insertion portion (143) and the fixed plate portion (151). Through this, wear of the rotating shaft insertion part (143) and / or the fixed wrap (154) can be suppressed, thereby increasing the compression effect, and at the same time, the bearing inserted into the rotating shaft insertion part (143) and / or the inner end of the fixed wrap (154) can be suppressed from being damaged due to overheating.

[0115] In addition, in the present embodiment, among the multiple oil grooves (1811) (1812) (1813) provided on the front end surface (143c) of the rotary shaft insertion portion (143), some of the oil grooves (the first oil groove in the present embodiment) (181) can be directly connected to the back pressure chamber (Sp) through the oil supply hole (182). Accordingly, the oil flowing into the back pressure chamber (Sp) can be supplied quickly and continuously toward the first oil groove (1811). Through this, wear of the rotary shaft insertion portion (143) and / or the fixed wrap (154) can be further suppressed, thereby further increasing the compression effect, and at the same time, the inner end of the bearing and / or the fixed wrap (154) inserted into the rotary shaft insertion portion (143) (or the sub-axis hole) can be more effectively suppressed from being damaged due to overheating.

[0116] Meanwhile, there are other examples of oil grooves as follows.

[0117] That is, in the above-described embodiment, a plurality of oil grooves are formed independently on the front end surface of the rotary shaft insertion portion, but in some cases, some of the plurality of oil grooves may be connected to each other.

[0118] Fig. 7 is a plan view showing another embodiment of an oil groove.

[0119] Referring to Fig. 7, the basic configuration and the resulting operational effects of the scroll compressor according to the present embodiment are similar to those of the above-described embodiment. For example, in the scroll compressor according to the present embodiment, the rotating shaft (125) sequentially penetrates the main frame (130), the orbiting scroll (140), and the fixed scroll (150) and is coupled thereto, and a thrust surface is formed between the rotating shaft insertion portion (143) of the orbiting scroll (140) and the fixed plate portion (151) of the fixed scroll (150) facing it, so that oil flowing into the rotating shaft insertion portion (143) can be prevented from flowing into the compression chamber or the refrigerant in the compression chamber can be prevented from leaking into the rotating shaft insertion portion (143).

[0120] In addition, in this case, an oil groove (181) may be formed on the front end surface (143c) of the rotary shaft insertion portion (143) facing the fixed plate portion (151). Through this, by cooling and / or lubricating between the rotary shaft insertion portion (143) and the fixed plate portion (151), wear of the rotary shaft insertion portion (143) and / or the fixed wrap (154) can be suppressed, and at the same time, damage to the bearing inserted into the rotary shaft insertion portion (or sub-axis hole) (143) as well as the inner end of the fixed wrap (154) can be suppressed.

[0121] In addition, in this case, a plurality of oil grooves (1811)(1812)(1813) are formed, and some of the oil grooves (1811)(1813) are connected to the back pressure chamber (Sp) through the oil supply hole (182), and other oil grooves (1812) can be connected to the inner surface (143a) of the rotary shaft insertion part (143). Through this, the oil of the back pressure chamber (Sp) can be quickly and continuously supplied to the corresponding oil grooves (1811)(1813) through the oil supply hole (182), and the oil flowing into the inner surface (143a) of the rotary shaft insertion part (143) can be directly supplied to the oil groove (1812) connected to the rotary shaft insertion part (143).

[0122] However, in the present embodiment, among the plurality of oil grooves, some of the oil grooves (1811) (1813) may be formed to be connected to each other. For example, the first oil groove (1811) and the third oil groove (1813) may be connected to each other through the first communication groove (1851). In other words, one end of the first communication groove (1851) may be connected to the end toward the second increasing portion (1435) among the two ends of the first oil groove (1811), and the other end of the first communication groove (1851) may be connected to the third oil groove (1813) by bypassing the second oil groove (1812).

[0123] In this case, the oil supply hole (182) described above may be connected to one of the first oil groove (1811) and the third oil groove (1813). This embodiment illustrates an example in which the oil supply hole (182) is formed to be connected to the first oil groove (1811). Accordingly, oil in the back pressure chamber (Sp) flows into the first oil groove (1811) through the oil supply hole (182), and this oil can move to the third oil groove (1813) through the first communication groove (1851).

[0124] In the case where some of the oil grooves (1811)(1813) among the plurality of oil grooves are connected to each other as described above, while forming an oil supply hole (182) in one oil groove (1811), the plurality of oil grooves (1811)(1813) can be connected to the back pressure chamber (Sp) through the oil supply hole (182). Through this, oil is supplied quickly and continuously not only to the oil groove (e.g., the first oil groove) (1811) connected to the oil groove (e.g., the third oil groove) (181) but also to other oil grooves (e.g., the third oil groove) (181) connected to the oil groove (e.g., the first oil groove) (1811), thereby more effectively cooling and / or lubricating the space between the rotating shaft insert (143) and the fixed plate (151).

[0125] Although not shown in the drawing, the oil supply hole (182) may be connected to the third oil groove (1813), and in some cases, the oil supply hole (182) may be formed to be connected to the first oil groove (1811) and the third oil groove (1813), respectively. In the latter case, not only can the first communication groove (1851) be excluded, but oil can also be supplied more quickly and continuously toward the first oil groove (1811) and the third oil groove (1813).

[0126] Meanwhile, another example of an oil groove is as follows.

[0127] That is, in the embodiments described above, a plurality of oil grooves are formed separately on the front end surface of the rotary shaft insertion portion, but in some cases, a single oil groove may be formed in a long arc shape on the front end surface of the rotary shaft insertion portion.

[0128] Fig. 8 is a plan view showing another embodiment of an oil groove.

[0129] Referring to Fig. 8, the basic configuration and the resulting operational effects of the scroll compressor according to the present embodiment are similar to those of the above-described embodiment. For example, in the scroll compressor according to the present embodiment, the rotating shaft (125) sequentially penetrates the main frame (130), the orbiting scroll (140), and the fixed scroll (150) and is coupled thereto, and a thrust surface is formed between the rotating shaft insertion portion (143) of the orbiting scroll (140) and the fixed plate portion (151) of the fixed scroll (150) facing it, so that oil flowing into the rotating shaft insertion portion (143) can be prevented from flowing into the compression chamber (V) or refrigerant in the compression chamber (V) can be prevented from leaking into the rotating shaft insertion portion (143).

[0130] In addition, in this case, an oil groove (181) may be formed on the front end surface (143c) of the rotary shaft insertion portion (143) facing the fixed plate portion (151). Through this, by cooling and / or lubricating between the rotary shaft insertion portion (143) and the fixed plate portion (151), wear of the rotary shaft insertion portion (143) and / or the fixed wrap (154) can be suppressed, and at the same time, damage to the bearing inserted into the rotary shaft insertion portion (or sub-axis hole) (143) as well as the inner end of the fixed wrap (154) can be suppressed.

[0131] However, in this embodiment, only one oil groove (181) is formed, and the one oil groove (181) can be formed over almost the entire front end surface (143c) of the rotary shaft insertion portion (143). For example, the oil groove (181) can be formed to extend long over the first increasing portion (1433), the decreasing portion (1434), and the second increasing portion (1435) of the rotary shaft insertion portion (143).

[0132] In this case, the oil groove (181) can be connected to the back pressure chamber (Sp) through the oil supply hole (182). In other words, an oil supply hole (182) connected to the back pressure chamber (Sp) can be formed at one end of the oil groove (181) (the end on the side of the first increase portion (1433) in the drawing). Accordingly, oil in the back pressure chamber (Sp) can be quickly and continuously supplied to the oil groove (181) through the oil supply hole (182).

[0133] As described above, when an oil groove (181) is formed on the front end surface (143c) of the rotary shaft insertion portion (143), and this oil groove (181) is formed over the entire front end surface (143c) of the rotary shaft insertion portion (143), the oil groove (181) can be easily processed while effectively cooling and / or lubricating the space between the front end surface (143c) of the rotary shaft insertion portion (143) and the fixed plate portion (151) facing it.

[0134] In addition, when connecting one oil groove (181) and the back pressure chamber (Sp) with an oil supply hole (182), oil can be supplied to the oil groove (181) quickly and continuously even when only one oil groove (181) is formed on the front end face (143c) of the rotary shaft insertion portion (143). This allows for more effective cooling and / or lubrication between the rotary shaft insertion portion (143) and the fixed plate portion (151).

[0135] Meanwhile, another example of an oil groove is as follows.

[0136] That is, in the above-described embodiments, some oil grooves are formed to be connected to the back pressure chamber, but in some cases, the oil grooves may be connected to the inner surface of the rotary shaft insert.

[0137] Fig. 9 is a plan view showing another embodiment of an oil groove.

[0138] Referring to Fig. 9, the basic configuration and the resulting operational effects of the scroll compressor according to the present embodiment are similar to those of the above-described embodiment. For example, in the scroll compressor according to the present embodiment, the rotating shaft (125) sequentially penetrates the main frame (130), the orbiting scroll (140), and the fixed scroll (150) and is coupled thereto, and a thrust surface is formed between the rotating shaft insertion portion (143) of the orbiting scroll (140) and the fixed plate portion (151) of the fixed scroll (150) facing it, so that oil flowing into the rotating shaft insertion portion (143) can be prevented from flowing into the compression chamber (V) or the refrigerant in the compression chamber (V) can be prevented from leaking into the rotating shaft insertion portion (143).

[0139] In addition, in this case, an oil groove (18) may be formed on the front end surface (143c) of the rotary shaft insertion portion (143) facing the fixed plate portion (151). This allows cooling and / or lubrication between the rotary shaft insertion portion (143) and the fixed plate portion (151), thereby suppressing wear of the rotary shaft insertion portion (143) and / or the fixed wrap (154), and simultaneously suppressing damage to the bearing inserted into the rotary shaft insertion portion (or sub-axis hole) (143) as well as the inner end of the fixed wrap (154).

[0140] In addition, in this case, a plurality of oil grooves (1811) (1812) (1813) are formed, and some of the oil grooves (e.g., the first oil groove) (1811) may be formed across the first increasing portion (1433), the decreasing portion (1434), and the second increasing portion (1435) of the rotating shaft insertion portion (143). Accordingly, the area between the front end surface (143c) of the rotating shaft insertion portion (143) and the fixed plate portion (151) facing it can be effectively cooled and / or lubricated.

[0141] However, in the present embodiment, the first oil groove (1811) may be opened toward the inner surface (143a) of the rotary shaft insertion portion (143). For example, one end of the second communication groove (1825a) (1825b) may be connected to both ends of the first oil groove (1811), and the other end of the second communication groove (1825a) (1825b) may be connected to the inner surface (143a) of the rotary shaft insertion portion (143). Accordingly, the first oil groove (1811) may be directly connected to the inner surface (143a) of the rotary shaft insertion portion (143).

[0142] As described above, when the first oil groove (1811) is directly connected to the inner surface (143a) of the rotary shaft insertion portion (143), oil can be supplied to each of the oil grooves (1811) (1812) (1813) even without forming a separate oil supply hole (182). This makes it possible to easily process the orbiting scroll (140) by eliminating machining of the oil supply hole (182), while effectively cooling and / or lubricating the area between the front end surface (143c) of the rotary shaft insertion portion (143) and the fixed plate portion (151) facing it.

[0143] Although not shown in the drawing, when the oil grooves (1811)(1812)(1813) are formed by being separated into multiple pieces, other than the first oil groove (1811) described above, another oil groove (e.g., the third oil groove) (1813) located in the second increase portion (1435) may be connected to the back pressure chamber (Sp) via the oil supply hole (182). In this case, oil from the back pressure chamber (Sp) can be quickly and continuously supplied to the third oil groove (1813) via the oil supply hole (182).

[0144] Meanwhile, there are other examples of refueling holes, as follows.

[0145] That is, in the embodiment described above, the fueling holes are formed in multiple stages, but in some cases, a separate pressure reducing pin may be provided inside the fueling hole.

[0146] Fig. 10 is a plan view showing another embodiment of a fueling hole, and Fig. 11 is a cross-sectional view taken along line "XI-XI" of Fig. 10.

[0147] Referring to FIGS. 10 and 11, the basic configuration and the resulting operational effects of the scroll compressor according to the present embodiment are similar to those of the above-described embodiment. For example, in the scroll compressor according to the present embodiment, the rotating shaft (125) sequentially penetrates the main frame (130), the orbiting scroll (140), and the fixed scroll (150) and is coupled thereto, and a thrust surface is formed between the rotating shaft insertion portion (143) of the orbiting scroll (140) and the fixed plate portion (151) of the fixed scroll (150) facing it, so that oil flowing into the rotating shaft insertion portion (143) can be prevented from flowing into the compression chamber (V) or refrigerant in the compression chamber (V) can be prevented from leaking into the rotating shaft insertion portion (143).

[0148] In addition, in this case, an oil groove may be formed on the front end surface (143c) of the rotary shaft insertion portion (143) facing the fixed plate portion (151). This allows cooling and / or lubrication between the rotary shaft insertion portion (143) and the fixed plate portion (151), thereby suppressing wear of the rotary shaft insertion portion (143) and / or the fixed wrap (154), and simultaneously suppressing damage to the bearing inserted into the rotary shaft insertion portion (or sub-axis hole) (143) as well as the inner end of the fixed wrap (154).

[0149] In addition, in this case, a plurality of oil grooves (1811)(1812)(1813) are formed, and some of the oil grooves (e.g., the first oil groove) (1811) may be connected to the back pressure chamber (Sp) through the oil supply hole (182), and other oil grooves (1812)(1813) may be connected to the inner surface (143a) of the rotary shaft insertion portion (143). Through this, the oil in the back pressure chamber (Sp) may be quickly and continuously supplied to the corresponding oil groove (1811) through the oil supply hole (182), and the oil flowing into the inner surface (143a) of the rotary shaft insertion portion (143) may be directly supplied to the oil groove (1812)(1813) connected to the rotary shaft insertion portion (143).

[0150] However, in the present embodiment, a pressure relief pin (183) may be inserted into the fuel supply hole (182), and a blocking member (184) may be fastened to the end of the back pressure chamber (Sp) forming the entrance of the fuel supply hole (182). For example, the fuel supply hole (182) may be formed of a first hole portion (1821) and a second hole portion (1822) having different inner diameters, as in the embodiment of FIG. 5 described above, and a pressure relief pin (183) may be inserted into the first hole portion (1821) having a relatively large inner diameter.

[0151] In this case, a refueling guide groove (182a) may be extended from one end of the first hole portion (1821) facing the main frame (130). For example, the refueling guide groove (182a) may extend laterally from one end of the first hole portion (1821), and the inner diameter of an imaginary circle connecting the outer ends of the refueling guide groove (182a) may be formed to be larger than the outer diameter of the blocking member (184). Accordingly, even if the refueling guide groove (182a) is exposed to the outer side of the blocking member (184) and the blocking member (184) is fastened to the refueling hole (182), the refueling hole (182) may be prevented from being blocked by the blocking member (184).

[0152] In the case where the pressure reducing pin (183) is inserted into the oil supply hole (182) as described above, the length (L1') of the first hole portion (1821) can be formed to be long. For example, the length (L1') of the first hole portion (1821) can be formed to be longer than the length (L2') of the second hole portion (1822), but can be formed to be longer than the length (L1) of the first hole portion (1821) in the embodiment of FIG. 5 described above. In other words, in the present embodiment, since the pressure of the oil passing through the oil supply hole (182) is reduced by the pressure reducing pin (183), even if the length (L1') of the first hole portion (1821) is formed to be long, an appropriate pressure reducing effect can be obtained. Accordingly, the length (L2') of the second hole portion (1822) with a small inner diameter can be formed to be short, so that the oil supply hole (182) can be easily processed.

Claims

1. Casing with storage space; A driving motor provided in the internal space of the above casing; A rotating shaft coupled to the rotor of the above driving motor and having an oil passage formed therein to absorb oil from the above oil storage space; A main frame provided on one side of the above driving motor; A turning scroll having a turning plate portion facing the main frame, a turning wrap on one side of the turning plate portion, and a turning shaft insertion portion into which the turning shaft is inserted, formed by penetrating the turning plate portion; and A fixed scroll is provided with a fixed wrap that is interlocked with the above-mentioned rotating wrap and forms a compression chamber together with the above-mentioned rotating wrap. A scroll compressor in which a first oil groove is formed on a front surface of the rotary shaft insertion portion that connects the inner surface of the rotary shaft insertion portion facing the outer surface of the rotary shaft and the outer surface of the rotary shaft insertion portion facing the inner surface of the fixed wrap, and an oil supply hole is formed in the orbiting scroll on a surface facing the main frame and is connected to the first oil groove.

2. In paragraph 1, The above first oil groove is, A scroll compressor formed so that at least a portion thereof is located in a portion where the width from the inner surface to the outer surface of the above-mentioned rotary shaft insertion portion decreases.

3. In paragraph 1, The cross-section of the above rotary shaft insertion part is A first part provided on one side of the circular portion facing the discharge end of the above fixed wrap, the width of which is expanded from the inner circumference to the outer circumference of the above rotary shaft insertion portion; A second part extending along the compression chamber in the first part and having a width that decreases from the inner surface to the outer surface of the rotary shaft insert; and In the second part, a third part is included that extends along the compression chamber and increases in width from the inner surface to the outer surface of the rotary shaft insertion part. The above first oil groove is, A scroll compressor formed so that at least a portion thereof is positioned within the second portion.

4. In paragraph 3, A first sealing surface is formed between the inner surface of the first oil groove and the inner surface of the rotary shaft insert, and a second sealing surface is formed between the outer surface of the first oil groove and the outer surface of the rotary shaft insert. The above first sealing surface and the above second sealing surface, A symmetrical scroll compressor with the first oil groove interposed therebetween.

5. In paragraph 3, In the third part above, a second oil groove is formed that is connected to the inner surface of the rotary shaft insertion part, The above second oil groove is, A scroll compressor separated from the first oil groove.

6. In paragraph 5, In the third part, a third oil groove is formed that is spaced apart from the inner surface of the rotary shaft insert. The above third oil groove is, A scroll compressor separated from the first oil groove and the second oil groove.

7. In paragraph 3, In the third part, a third oil groove is formed that is spaced apart from the inner surface of the rotary shaft insert. The above third oil groove is, A scroll compressor connected to the first oil groove.

8. In paragraph 3, The above first oil groove is, A scroll compressor, wherein at least a portion of the first portion is formed across the third portion.

9. In paragraph 1, A sealing member is provided between the main frame and one side of the pivot plate facing it to surround the periphery of the rotation shaft insertion portion. The above fueling hole is, A scroll compressor formed to penetrate the space between the above-mentioned rotary shaft insertion portion and the above-mentioned sealing member.

10. In paragraph 9, The above fueling hole is, A scroll compressor in which the inner diameter of the second stage facing the fixed scroll is formed smaller than the inner diameter of the first stage facing the main frame.

11. In paragraph 9, A scroll compressor in which a pressure reducing member is provided inside the above-mentioned oil supply hole, and a blocking member is provided at one end of the above-mentioned oil supply hole to prevent the pressure reducing member from coming off.

12. In paragraph 11, At one end of the above-mentioned fueling hole, a fueling guide groove is formed to intersect with the above-mentioned fueling hole, The above refueling information home page is, A scroll compressor formed to be exposed to the outside of the above-mentioned blocking member.

13. Casing with storage space; A driving motor provided in the internal space of the above casing; A rotating shaft coupled to the rotor of the above driving motor and having an oil passage formed therein to absorb oil from the above oil storage space; A main frame provided on one side of the above driving motor; A turning scroll having a turning plate portion facing the main frame, a turning wrap on one side of the turning plate portion, and a turning shaft insertion portion into which the turning shaft is inserted, formed by penetrating the turning plate portion; and A fixed scroll is provided with a fixed wrap that is interlocked with the above-mentioned rotating wrap and forms a compression chamber together with the above-mentioned rotating wrap, The outer surface of the above-mentioned rotary shaft insertion portion facing the inner surface of the above-mentioned fixed wrap is A first increasing portion provided on one side of the circular portion facing the discharge end of the fixed wrap and having a width that expands from the inner surface to the outer surface of the rotating shaft insertion portion facing the outer surface of the rotating shaft; A reducing portion extending along the compression chamber in the first increasing portion and having a width that decreases from the inner circumference to the outer circumference of the rotating shaft insert; and In the above reduction section, a second increasing section is included that extends along the compression chamber and increases the width from the inner surface to the outer surface of the rotary shaft insertion section. A scroll compressor in which an oil groove sunken to a preset depth is formed on at least a portion of the front surface of the rotary shaft insertion portion belonging to the above reduction portion.

14. In paragraph 13, The above oil groove is, A scroll compressor formed so that at least a portion thereof is positioned within the reduction section.

15. In paragraph 13, The above rotating scroll is, A scroll compressor in which an oil supply hole is formed on the other side of the pivot plate portion facing the main frame and penetrating through the front end surface of the rotation shaft insert portion to communicate with the oil groove.

16. In paragraph 13, The above oil groove is formed so that at least a portion thereof is positioned across the first increasing portion and the second increasing portion, The inner surface of the above oil groove is A scroll compressor connected to the inner surface of the above-mentioned rotary shaft insert.

Images