Scroll compressor

Abstract

A scroll compressor is provided, the compressor comprising: a casing in which an inner space is sealed and which has a refrigerant suction pipe for introducing a refrigerant into the inner space; a driving unit provided with a stator and a rotor; a rotary shaft rotatably coupled to the rotor; a main frame provided at one side of the driving unit and fixed in the inner space of the casing; an orbiting scroll coupled to the rotary shaft so as to move in an orbiting motion and supported on the main frame in the axial direction; and a non-orbiting scroll coupled to engage with the orbiting scroll to form a compression chamber, wherein an oil supply groove is formed in one direction on one side of the main frame, which faces the orbiting scroll, so as to allow oil to flow toward the outer circumference of the main frame, and one side of the oil supply groove is adjacent to one side of the refrigerant suction pipe so that oil is supplied to the compression chamber, together with the refrigerant introduced through the refrigerant suction pipe.

Description

scroll compressor

[0001] The present invention relates to a scroll compressor, and more particularly, to a scroll compressor having a structure capable of increasing the amount of oil supplied to a compression unit without affecting the oil supplied to an existing friction unit.

[0002] A scroll compressor is a combination of a rotating scroll and a non-rotating scroll that are interlocked and combined, and the rotating scroll rotates relative to the non-rotating scroll to form a pair of compression chambers.

[0003] The compression chamber is composed of a suction chamber formed on the periphery, an intermediate chamber formed continuously from the suction chamber with a gradually decreasing volume toward the center, and a discharge chamber extending toward the center of the intermediate chamber. Typically, the suction chamber is formed by penetrating the side of the non-orbiting scroll, the intermediate chamber is sealed, and the discharge chamber is formed by penetrating the plate portion of the non-orbiting scroll.

[0004] Scroll compressors can be categorized as low-pressure and high-pressure types, depending on the refrigerant suction path. In a low-pressure type, the refrigerant suction pipe is connected to the internal space of the casing, so that the low-temperature suction refrigerant passes through the internal space of the casing and is guided to the suction pressure chamber. In a high-pressure type, the refrigerant suction pipe is directly connected to the suction pressure chamber, so that the refrigerant is guided directly to the suction pressure chamber without passing through the internal space of the casing.

[0005] Patent Document 1 (KR 10-2008-0068445 A) discloses a structure in which a groove is machined on a main frame thrust surface to supply oil to a compression unit, and then a hole is machined in a position where the rotating scroll passes through the groove, thereby allowing more oil to enter the compression unit.

[0006] However, machining grooves on the thrust surface in this manner can cause the oil film around the grooves to break, damaging the friction surface. Furthermore, compared to the absence of such a structure, there is a risk of reduced oil supply at thrust locations other than those where grooves are present.

[0007] Meanwhile, other conventional high-pressure scroll compressors are known, including one example in which thrust oil grooves are optimized and applied to the high-pressure scroll compressor. To supply oil to the compression unit, a portion of the oil discharged from the shaft is processed to be supplied to the compression unit through holes in the orbiting scroll. This utilizes the oil discharged from the shaft before it passes through the mainframe pocket to the mainframe thrust, thereby reducing the amount of oil applied to the mainframe thrust surface compared to when this structure is not present. Consequently, the reduced oil volume may increase frictional loss on the thrust surface.

[0008] Typically, the lubrication of a scroll compressor is accomplished as follows. As the rotating shaft within the casing rotates, oil accumulated at the bottom of the compressor flows into the shaft and is moved vertically by a propeller installed on the inner side of the lower shaft. The oil, which has moved to a certain height, moves upward along the eccentric internal flow path of the shaft due to centrifugal force resulting from the shaft rotation. Some of the oil is supplied to the journal bearing of the main frame during the movement, and the remainder is discharged from the upper part of the pin at the top of the rotating shaft and supplied to the orbiting scroll journal bearing and the thrust surface between the orbiting scroll and the main frame. Afterwards, the oil is returned to the bottom of the compressor, thereby circulating the oil.

[0009] As the oil circulates, some of it is incorporated into the refrigerant and flows into the compression unit. It is then discharged along with the refrigerant, completing the cycle. The oil supplied to the compression unit prevents leakage between the rotating scroll and the fixed scroll and reduces friction. Therefore, it is crucial to ensure a sufficient supply of oil to prevent oil shortage in the compression unit.

[0010] The present invention has been devised to solve the above-mentioned problem, and one object of the present invention is to provide a structure that smoothly provides additional oil to a compression section of a scroll compressor.

[0011] Another object of the present invention is to provide a scroll compressor having a structure in which oil passing through a thrust surface can move to the suction refrigerant side and be provided to a compression section immediately before flowing into a storage space.

[0012] Another object of the present invention is to provide a structure in which the amount of oil provided into the compression chamber is increased, thereby reducing leakage within the compression chamber, and in which oil provided to the friction surface such as the thrust surface is not insufficient without requiring separate processing of the turning plate, etc.

[0013] In order to solve the above problem, the scroll compressor of the present invention includes a casing having a sealed internal space and a refrigerant suction pipe that allows refrigerant to be introduced into the internal space; a driving unit having a stator fixed to the internal space and a rotor that rotates inside the stator; a rotating shaft rotatably coupled to the rotor; a main frame provided on one side of the driving motor and fixed to the internal space of the casing; an orbiting scroll coupled to the rotating shaft so as to be rotatable and axially supported by the main frame; and a non-orbiting scroll engaged with the orbiting scroll to form a compression chamber, wherein an oil supply groove is provided on one surface of the main frame facing the orbiting scroll and formed in one direction to allow oil to flow to the outer periphery of the main frame, and the oil supply groove is arranged such that one side thereof is adjacent to one side of the refrigerant suction pipe so that oil is supplied to the compression chamber together with refrigerant introduced through the refrigerant suction pipe.

[0014] This allows the oil to be naturally supplied to the compression unit by being included in the refrigerant being sucked into the compression unit, by directing the oil to the location where the refrigerant is sucked.

[0015] The above-mentioned refueling groove may include a first groove formed in a circumferential direction on one side of the main flange; and a second groove formed in a direction intersecting the first groove and communicating with the first groove, and extending to the outer periphery of the main frame.

[0016] According to the present invention, the oil supply groove is formed to include a first groove and a second groove, so that oil that has escaped the thrust surface between the main frame and the orbiting scroll flows along the first groove in the main flange portion and is received, and then flows out to the outer periphery of the main frame through the second groove, and can be introduced into the compression chamber together with the suction refrigerant.

[0017] The main frame includes a main flange portion having the rotation axis provided on the inner periphery; a scroll support portion provided on one surface of the main flange portion and supporting the rotary scroll in the axial direction; and the oil supply groove may be formed in the main flange portion provided on the outer side of the scroll support portion.

[0018] Due to this, oil passing through the thrust surface between the scroll support and the orbiting scroll can flow along the outer side of the scroll support in the main flange and be introduced into the compression chamber together with the suction refrigerant.

[0019] The main frame includes a main flange portion having the rotation axis provided on the inner surface thereof; a scroll support portion provided on one surface of the main flange portion and supporting the rotary scroll in the axial direction; the scroll support portion has a portion extending in the circumferential direction; and the first groove may be provided on the outer side of the scroll support portion.

[0020] Due to this, oil passing through the thrust surface between the scroll support and the orbiting scroll can flow from the outside of the scroll support along the first and second grooves in the main flange and be introduced into the compression chamber together with the suction refrigerant.

[0021] Preferably, the scroll support portion is formed to protrude in a direction toward the rotating scroll from one side of the main flange portion, and the first groove may be provided on the outside of the scroll support portion.

[0022] The above first home can be arranged adjacent to the outer periphery of the scroll support member.

[0023] The above second groove can extend from one side of the main flange portion provided with the above first groove to the outer circumference of the main flange portion.

[0024] Due to this, oil passing through the thrust surface between the scroll support and the rotating scroll flows along the first groove and the second groove, is provided to the outer periphery of the main frame, and can be provided to the compression chamber together with the suction refrigerant.

[0025] The scroll compressor of the present invention further includes an Oldham ring disposed between the main frame and the orbiting scroll, slidably coupled to the orbiting scroll to prevent rotation of the orbiting scroll, wherein the Oldham ring has a support portion that slides while being supported by the main flange portion, and the oil supply groove may be disposed to be spaced apart from the support portion.

[0026] If a portion of the oil supply groove is formed to contact or communicate with the support, a structure for supplying oil to the support may be formed, resulting in insufficient oil being reintroduced into the compression chamber. Therefore, since the oil supply groove does not contact or communicate with the support and is spaced apart from the support, the amount of oil supplied between the main frame and the support of the Oldham ring is reduced, allowing a relatively sufficient amount of oil to be supplied to the compression chamber.

[0027] Preferably, the support portion is formed by protruding from one side of the old ring, the support portion is provided in multiple numbers, and the oil supply groove can be formed between the multiple support portions.

[0028] The oil supply groove may be positioned at a higher position than the center of the refrigerant suction pipe installed in the casing so that the oil discharged from the oil supply groove and the oil flow path through which the refrigerant sucked through the refrigerant suction pipe rises meet each other.

[0029] Due to this, a path through which oil is discharged from the oil supply groove and descends can be formed so that a path through which refrigerant sucked in through the refrigerant suction pipe rises meets each other, so that the oil can flow into the compression chamber along with the sucked refrigerant.

[0030] On one side of the above-mentioned oil supply groove, a through-hole formed through the outer periphery of the main frame is provided, and the main frame is provided with an oil discharge path through which oil is discharged on the outer periphery where the through-hole is formed, and the inner periphery of the casing in which the refrigerant suction pipe is installed is provided with a refrigerant suction path, and the oil discharge path can be arranged to be connected to the refrigerant suction path.

[0031] According to another example related to the present invention, there is provided a refrigerant-suction system comprising: a casing having a sealed internal space and a refrigerant suction pipe for allowing refrigerant to be introduced into the internal space; a driving unit having a stator fixed to the internal space and a rotor that rotates within the stator; a rotating shaft rotatably coupled to the rotor; a main frame provided on one side of the driving motor and fixed to the internal space of the casing; an orbiting scroll coupled to the rotating shaft so as to be capable of a rotational movement and axially supported by the main frame; a non-orbiting scroll coupled to the orbiting scroll so as to be engaged with the orbiting scroll to form a compression chamber; And an Oldham ring is received in the main frame so as to be arranged between the main frame and the orbiting scroll, and is slidably coupled to the orbiting scroll to prevent rotation of the orbiting scroll, and an oil supply groove is provided on one side of the main frame where the Oldham ring is received to allow oil to flow to the outside of the main frame, and the Oldham ring has a support portion that protrudes toward the main frame and slides while being supported by the main frame, and the oil supply groove is spaced apart from the support portion so as not to overlap.

[0032] If a portion of the oil supply groove is formed to contact or communicate with the support, a structure for supplying oil to the support may be formed, resulting in insufficient oil being reintroduced into the compression chamber. Therefore, since the oil supply groove does not contact or communicate with the support and is spaced apart from the support, the amount of oil supplied between the main frame and the support of the Oldham ring is reduced, allowing a relatively sufficient amount of oil to be supplied to the compression chamber.

[0033] The above-mentioned refueling groove may include a first groove provided in a circumferential direction on one side of the main frame; and a second groove connected to the first groove, formed in a direction intersecting the first groove, and formed to the outer periphery of the main frame.

[0034] According to the present invention, the oil supply groove is formed to include a first groove and a second groove, so that oil that has escaped the thrust surface between the main frame and the orbiting scroll flows along the first groove in the main flange portion and is received, and then flows out to the outer periphery of the main frame through the second groove, and can be introduced into the compression chamber together with the suction refrigerant.

[0035] The first groove is formed of at least two grooves spaced apart from each other, and a support member may be spaced apart between the two ends of each first groove.

[0036] Compared to the first groove formed in the shape of a single circle described below, the first groove formed in two can be formed to have a large width by forming a structure in which the support portion can be placed between the two ends rather than inside the support portion. Accordingly, by accommodating a more sufficient amount of oil and then discharging it through the second groove into the oil discharge path, it can be introduced into the compression chamber together with the suction refrigerant.

[0037] According to another example, the first groove may be formed in the shape of a circle and spaced apart from the inner side of the support.

[0038] In the case of the first groove formed in the shape of a single circle, it is desirable to have a smaller width than the first groove formed in two, as it must be spaced apart from the inside of all four supports. In addition, in the case of the first groove formed in the shape of a single circle, it can be formed to have a longer length than the first groove formed in two, thereby enabling it to flow for a longer distance.

[0039] The main frame includes a main flange portion accommodated inside the casing; a scroll support portion provided on one surface of the main flange portion and supporting the rotating scroll in the axial direction; and an Oldham ring receiving portion formed in an annular shape along the outer circumference of the scroll support portion on one surface of the main flange portion, and the oil supply groove may be formed in the Oldham ring receiving portion.

[0040] The main frame includes a main flange portion accommodated inside the casing; a scroll support portion provided on one surface of the main flange portion and supporting the rotary scroll in the axial direction; and an Oldham ring receiving portion formed in an annular shape along an outer circumference of the scroll support portion on one surface of the main flange portion, and the first groove may be provided in the Oldham ring receiving portion.

[0041] The oil supply groove may be positioned at a higher position than the center of the refrigerant suction pipe installed in the casing so that the oil discharged from the oil supply groove and the oil flow path through which the refrigerant sucked through the refrigerant suction pipe rises meet each other.

[0042] Due to this, a path through which oil is discharged from the oil supply groove and descends can be formed so that a path through which refrigerant sucked in through the refrigerant suction pipe rises meets each other, so that the oil can flow into the compression chamber along with the sucked refrigerant.

[0043] On one side of the above-mentioned oil supply groove, a through-hole formed through the outer periphery of the main frame is provided, and the main frame is provided with an oil discharge path through which oil is discharged on the outer periphery where the through-hole is formed, and the inner periphery of the casing in which the refrigerant suction pipe is installed is provided with a refrigerant suction path, and the oil discharge path can be arranged to be connected to the refrigerant suction path.

[0044] The second groove may include a linear groove formed in a straight line from one side of the first groove to the outer periphery of the main frame, and a cross groove intersecting from one side of the first groove to the outer periphery of the main frame at a predetermined angle.

[0045] Since the scroll compressor of the present invention does not perform any separate processing on the rotating plate portion or the fixed scroll, it is possible to increase the amount of oil supplied to the compression chamber without affecting the oil supplied to the existing friction portion within the scroll compressor.

[0046] The scroll compressor of the present invention collects oil supplied to each friction part through an axial pump in a storage space and supplies it to the suction refrigerant side just before the oil is supplied back into the storage space, so that other friction parts are not affected by oil shortage or other phenomena.

[0047] The scroll compressor of the present invention has a main frame provided with grooves to guide oil to a location where refrigerant is sucked, so that oil can be naturally supplied to the compression unit by being included in the refrigerant sucked into the compression unit.

[0048] The scroll compressor of the present invention can reduce friction loss of the thrust surface between the main frame and the orbiting scroll while enabling oil to be supplied to the compression section.

[0049] The scroll compressor of the present invention does not directly use the oil provided from the rotating shaft, but allows the oil used on the thrust surface between the main frame and the orbiting scroll to be reused, thereby preventing the oil film on the thrust surface between the main frame and the orbiting scroll from being broken, thereby reducing friction loss and enabling the supply of oil to the compression section.

[0050] The scroll compressor of the present invention does not require any additional configuration or processing other than forming an oil supply groove in the main frame, and can be advantageously applied because it allows oil already used to be reintroduced into the compression chamber, thereby not affecting factors related to the performance of the compressor.

[0051] In the scroll compressor of the present invention, since the amount of oil provided into the compression chamber increases, leakage within the compression chamber is reduced, and since separate processing is not required for the turning plate, etc., the oil provided to the friction surface is not insufficient, so the reliability of the parts is improved, and the performance of the compressor is improved.

[0052] Fig. 1 is a cross-sectional view showing a scroll compressor of the present invention.

[0053] Fig. 2 is an exploded perspective view showing the compression part in Fig. 1 in an exploded view.

[0054] Fig. 3 is a cutaway perspective view showing the upper part of Fig. 1 cut away to illustrate the compression section.

[0055] Figure 4 is a cutaway perspective view enlarged from the top of the rotation axis.

[0056] Figure 5 is a cutaway perspective view showing the top of the rotation axis and the side of the main frame in an enlarged manner.

[0057] Figure 6 is a perspective view showing the mainframe.

[0058] Figure 7 is a perspective view showing the mainframe and old ring disassembled.

[0059] Figure 8 is a perspective view showing the mainframe and the old ring.

[0060] Figure 9 is a conceptual diagram showing an area in which a refueling home can be formed in a mainframe.

[0061] Figure 10 is a plan view showing an example of a fuel groove being formed in a main frame.

[0062] Figure 11 is a plan view showing another example of a fuel groove being formed in a mainframe.

[0063] Hereinafter, a scroll compressor related to the present invention will be described in more detail with reference to the drawings.

[0064] In this specification, identical or similar reference numbers are assigned to identical or similar components in different embodiments, and redundant descriptions thereof are omitted.

[0065] Additionally, even if the embodiments are different, a structure applied to one embodiment can be applied to another embodiment as long as there is no structural or functional contradiction.

[0066] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0067] In describing the embodiments disclosed in this specification, if it is determined that a detailed description of a related known technology may obscure the gist of the embodiments disclosed in this specification, the detailed description is omitted.

[0068] The attached drawings are only intended to facilitate understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

[0069] Fig. 1 is a cross-sectional view illustrating a scroll compressor of the present invention, Fig. 2 is an exploded perspective view illustrating the compression section in Fig. 1 in an exploded manner, and Fig. 3 is a cut-away perspective view illustrating the compression section in Fig. 1 by cutting away the upper portion. Fig. 4 is an enlarged cut-away perspective view illustrating the upper portion of the rotation shaft (125), and Fig. 5 is an enlarged cut-away perspective view illustrating the upper portion of the rotation shaft (125) and the side portion of the main frame (130).

[0070] Hereinafter, the scroll compressor of the present invention will be described with reference to FIGS. 1 to 5.

[0071] The scroll compressor of the present invention comprises: a casing (110) having a sealed internal space and a refrigerant suction pipe (117) for allowing refrigerant to be introduced into the internal space; a driving unit having a stator (121) fixed to the internal space and a rotor (122) that rotates inside the stator (121); a rotating shaft (125) rotatably coupled to the rotor (122); a main frame (130) provided on one side of the driving unit and fixed to the internal space of the casing (110); an orbiting scroll (150) coupled to the rotating shaft (125) so as to be capable of rotating and axially supported by the main frame (130); and a non-orbiting scroll (140) coupled to the orbiting scroll (150) so as to be engaged with the rotating scroll to form a compression chamber (V).

[0072] On one side of the main frame (130) facing the rotating scroll (150), an oil supply groove (131a) is provided that is formed in one direction to allow oil to flow to the outside of the main frame (130).

[0073] Referring to FIGS. 3 and 5, the oil supply groove (131a) is arranged so that one side thereof is adjacent to one side of the refrigerant suction pipe (117) so that oil is supplied to the compression chamber (V) together with the refrigerant introduced through the refrigerant suction pipe (117).

[0074] This allows the oil to be naturally supplied to the compression chamber (V) by being included in the refrigerant being sucked into the compression chamber (V) by directing the oil to the location where the refrigerant is sucked.

[0075] In a conventional scroll compressor, if an oil supply groove (131a) is machined on the thrust surface (134a), the oil film around the oil supply groove (131a) may be broken, causing damage to the friction surface. In addition, there was a concern that oil supply would be reduced at thrust positions other than the position where the oil supply groove (131a) exists, in contrast to when the structure is not provided.

[0076] The present invention enables oil passing through the thrust surface (134a) to move to the suction refrigerant side through the oil supply groove (131a) of the main frame (130) immediately before flowing into the oil storage space (110c) and be supplied to the compression chamber (V).

[0077] In particular, the scroll compressor of the present invention collects oil supplied to each friction part through an axial pump in the oil storage space (110c) and supplies it to the suction refrigerant side just before the oil is supplied back into the oil storage space (110c), so that the friction part, particularly the thrust surface (134a), is not affected.

[0078] The scroll compressor of the present invention is provided with an oil supply groove (131a) in the main frame (130) so that oil is guided to a location where refrigerant is sucked, so that oil can be naturally supplied to the compression chamber (V) by being included in the refrigerant sucked into the compression chamber (V).

[0079] Due to this, the oil supplied to the compression chamber (V) can prevent leakage between the orbiting scroll (150) and the fixed scroll, and reduce the friction between the orbiting scroll (150) and the fixed scroll.

[0080] Hereinafter, with reference to FIG. 1, the scroll compressor of the present invention will be first described, and the detailed configuration of the fuel supply groove (131a) will be described later.

[0081] The scroll compressor of the present invention may be an air conditioning scroll compressor.

[0082] Referring to FIGS. 1 and 2, in a scroll compressor according to the present embodiment, a drive motor (120) is installed in the lower half of a casing (110), and a main frame (130), an orbiting scroll (150), a non-orbiting scroll (140), and a back pressure chamber assembly (160) are sequentially installed on the upper side of the drive motor (120). Typically, the drive motor (120) forms a power transmission unit, and the main frame (130), the orbiting scroll (150), the non-orbiting scroll (140), and the back pressure chamber assembly (160) form a compression unit. The power transmission unit is coupled to one end of a rotation shaft (125), and the compression unit is coupled to the other end of the rotation shaft (125). Accordingly, the compression unit is connected to the power transmission unit by the rotation shaft (125) and operates by the rotational force of the power transmission unit. In the present invention, the drive unit may be a drive motor (120).

[0083] The casing (110) may include a cylindrical shell (111), an upper cap (112), and a lower cap (113).

[0084] The cylindrical shell (111) has a cylindrical shape with both upper and lower ends open, and the aforementioned driving motor (120) and main frame (130) are inserted and fixed to the inner surface. A terminal bracket (not shown) is coupled to the upper half of the cylindrical shell (111), and a terminal (not shown) for transmitting external power to the driving motor (120) is coupled through the terminal bracket. In addition, a refrigerant suction pipe (117), which will be described later, is coupled through the upper half of the cylindrical shell (111), for example, the upper side of the driving motor (120).

[0085] In the present invention, by the refrigerant introduced through the refrigerant suction pipe (117), oil flowing through the upper surface of the main frame (130) can be additionally introduced naturally into the interior of the compression chamber (V), thereby improving the lubrication performance within the compression chamber (V).

[0086] The upper cap (112) is coupled to cover the opened upper part of the cylindrical shell (111), and the lower cap (113) is coupled to cover the opened lower part of the cylindrical shell (111). Between the cylindrical shell (111) and the upper cap (112), the rim of a high-low pressure separation plate (115), which will be described later, can be inserted and welded together to the cylindrical shell (111) and the upper cap (112), and between the cylindrical shell (111) and the lower cap (113), the rim of a support bracket (116), which will be described later, can be inserted and welded together to the cylindrical shell (111) and the lower cap (113). Accordingly, the internal space of the casing (110) is sealed.

[0087] The rim of the high-low pressure separator (115) is welded to the casing (110) as described above, and the central portion of the high-low pressure separator (115) is bent so as to protrude toward the upper cap (112) and is placed on the upper side of the back pressure chamber assembly (160) to be described later. A refrigerant suction pipe (117) is connected to the lower side of the high-low pressure separator (115), and a refrigerant discharge pipe (118) is connected to the upper side. Accordingly, a low pressure portion (110a) forming a suction space is formed on the lower side of the high-low pressure separator (115), and a high pressure portion (110b) forming a discharge space is formed on the upper side.

[0088] In addition, a through hole (115a) is formed in the center of the high-low pressure separator (115). A sealing plate (1151) from which a floating plate (165) to be described later is detachably attached is inserted and coupled into the through hole (115a). The low-pressure section (110a) and the high-pressure section (110b) can be blocked by attaching and detaching the floating plate (165) and the sealing plate (1151), or can be communicated through the high-low pressure communication hole (1151a) of the sealing plate (1151).

[0089] In addition, the lower cap (113) forms a low-pressure space (110c) together with the lower half of the cylindrical shell (111) forming the low-pressure portion (110a). In other words, the low-pressure space (110c) is formed in the lower half of the low-pressure portion (110a), and the low-pressure space (110c) forms a part of the low-pressure portion (110a).

[0090] Referring to Fig. 1, a driving motor (120) according to the present embodiment is provided in the lower half of a low-pressure portion (110a) and includes a stator (121) and a rotor (122). The stator (121) is fixed to the inner wall surface of a cylindrical shell (111) by hot pressing, and the rotor (122) is provided rotatably inside the stator (121).

[0091] The stator (121) includes a stator core (1211) and a stator coil (1212).

[0092] The stator core (1211) is formed in a cylindrical shape and is fixed to the inner surface of the cylindrical shell (111) by hot pressing. The stator coil (1212) is wound around the stator core (1211) and is electrically connected to an external power source through a terminal (not shown) that is connected through the casing (110).

[0093] The rotor (122) includes a rotor core (1221) and a permanent magnet (1222).

[0094] The rotor core (1221) is formed in a cylindrical shape and is rotatably inserted into the interior of the stator core (1211) at a predetermined gap interval. Permanent magnets (1222) are embedded in the interior of the rotor core (1221) at a predetermined gap interval along the circumference.

[0095] In addition, a rotation shaft (125) is coupled to the center of the rotor (122). The upper part of the rotation shaft (125) is rotatably inserted into a main frame (130) to be described later and supported in the radial direction, and the lower part of the rotation shaft (125) is rotatably inserted into a support bracket (116) and supported in the radial and axial directions.

[0096] The rotating shaft (125) includes a main shaft portion (1251a), an eccentric pin portion (125a), and a lubrication hole (125b).

[0097] The main shaft portion (1251a) is a portion that is press-fitted into the rotor (122) of the driving motor (120) and receives the rotational power of the driving motor (120). The main shaft portion (1251a) includes a rotor fixing portion (1251aa) that is fixed to the inside of the rotor (122), a main bearing surface portion (1251ab) that is fixed to the inside of the main frame (130), and a sub-bearing surface portion (1251ac) that is fixed to the inside of the sub-frame. The rotor fixing portion (1251aa) is press-fitted into the rotor (122) and coupled, the main bearing surface portion (1251ab) is inserted into the main bearing portion (132) of the main frame (130), and the sub-bearing surface portion (1251ac) can be inserted into and supported by the sub-bearing portion (1191) of the sub-frame (119).

[0098] The eccentric pin portion (125a) is a portion that is coupled to the sliding bush (155) and transmits the rotational power of the driving motor (120) to the rotating scroll (150), and extends axially from one end of the main shaft portion (1251a), that is, the end of the main bearing surface portion (1251ab), to the opposite side of the rotor fixing portion (1251aa).

[0099] The center of the eccentric pin portion (125a) is formed eccentrically with respect to the axial center (O) of the main shaft portion (or rotational shaft (125)) (1251a), and the outer diameter of the eccentric pin portion (125a) is formed smaller than the outer diameter of the main shaft portion (1251a), or more precisely, the outer diameter of the main bearing surface portion (1251ab). However, the outer peripheral surface of the eccentric pin portion (125a) is formed on the same axis as the outer peripheral surface of the main shaft portion (1251a), that is, the outer peripheral surface of the main bearing surface portion (1251ab), or is formed to be positioned inward (toward the center) so as not to protrude further than the outer peripheral surface of the main bearing surface portion (1251ab). Accordingly, the rotational shaft (125) coupled to the rotor (122) can be inserted into the shaft hole (132a) of the main frame (130).

[0100] An eccentric pin portion (125a) that is eccentrically coupled to a rotating scroll (150) to be described later is formed at the upper end of the rotating shaft (125), and an oil feeder (126) for sucking up oil stored in the lower part of the casing (110) may be installed at the lower end of the rotating shaft (125). The rotating shaft (125) is formed with an oil supply hole (125b) penetrating axially therein.

[0101] In the present invention, the oil sucked through the oil supply hole of the rotating shaft (125) is supplied to the thrust surface (134a) between the main frame (130) and the rotating scroll (150), flows laterally through the oil supply groove (131a), and flows together with the suction refrigerant introduced through the refrigerant suction pipe (117) so that it can be introduced into the compression chamber (V).

[0102] Referring to FIGS. 1 and 2, the main frame (130) according to the present embodiment is installed on the upper side of the driving motor (120) and is fixed by hot pressing or welding to the inner wall surface of the cylindrical shell (111).

[0103] Hereinafter, the structure of the fuel supply groove (131a) will be described in more detail with reference to FIGS. 6 to 11.

[0104] The main frame (130) may include a main flange portion (131) and a scroll support portion (134).

[0105] The main flange portion (131) is formed in an annular shape and is accommodated in the low pressure portion (110a) of the casing (110). The outer diameter of the main flange portion (131) is formed smaller than the inner diameter of the cylindrical shell (111), so that the outer surface of the main flange portion (131) is spaced apart from the inner surface of the cylindrical shell (111). However, a frame fixing portion (136), which will be described later, protrudes radially from the outer surface of the main flange portion (131), and the outer surface of the frame fixing portion (136) is fixedly attached to the inner surface of the casing (110). Accordingly, the frame (130) can be fixedly coupled to the casing (110).

[0106] Referring to Fig. 3, the height (h2) at which the oil supply groove (131a) is provided can be positioned higher than the height (h1) of the center of the refrigerant suction pipe (117) installed in the casing (110). As a result, the flow path that descends laterally from the main frame (130) through the oil supply groove (131a) and the flow path that ascends, through which the refrigerant introduced through the refrigerant suction pipe (117) enters the compression chamber (V), can meet, so that oil can be supplied to the compression chamber (V).

[0107] The refueling groove (131a) may include a first groove (131c) provided in a circumferential direction on one surface of the main flange portion (131); and a second groove (131b, 131b1) that is formed in a direction intersecting the first groove (131c) and connected to the first groove (131c) and extends to the outer periphery of the main frame (130).

[0108] The oil supply groove (131a) is formed to include a first groove (131c) and a second groove (131b, 131b1), so that oil that has escaped the thrust surface (134a) between the main frame (130) and the orbiting scroll (150) flows along the first groove (131c) in the main flange portion (131) and is received, and then, through the second groove (131b, 131b1), escapes to the outer periphery of the main frame (130) and can be introduced into the compression chamber (V) together with the suction refrigerant.

[0109] The refueling groove (131a) may be formed in the main flange portion (131). For example, it may be formed in the Oldham ring receiving portion (135), which is the portion where the Oldham ring (170) described later is installed.

[0110] Oil sucked through the rotating shaft (125) may be sprayed in all directions by the rotating motion of the rotating scroll (150) as it passes through the thrust surface (134a) between the main frame (130) and the orbiting scroll (150), or may flow down to the lower part of the main frame (130).

[0111] In the present invention, oil passing through the thrust surface (134a) is received in the oil supply groove (131a).

[0112] In particular, on the side of the main frame (130), it flows in the circumferential direction within the first groove (131c) and flows radially along the second groove (131b, 131b1) toward the outer periphery of the main frame (130), so that it can be supplied into the compression chamber (V) together with the suction refrigerant at the outer periphery of the main frame (130).

[0113] On one side of the refueling groove (131a), a penetration portion (131d) formed through the outer periphery of the main frame (130) may be provided. The penetration portion (131d) may be formed through the upper surface of the main frame (130) toward the outer periphery of the main frame (130).

[0114] The penetration portion (131d) may, for example, be provided on one side of the second groove (131b, 131b1). Oil from the oil supply groove (131a) flows along the first groove (131c) and is received, and then flows to the outer periphery of the main frame (130) through the second groove (131b, 131b1), and may flow through the penetration portion (131d) on the outer periphery of the main frame (130).

[0115] Oil that has exited the penetration portion (131d) is in the oil discharge path (131a1) and flows into the compression chamber (V) together with the refrigerant flowing into the refrigerant suction path (117a).

[0116] When understood by referring to the part described above in FIG. 3 and FIG. 6 together, the height (h2) at which the penetration portion (131d) is formed, for example, can be positioned higher than the height (h1) of the center of the refrigerant suction pipe (117) installed in the casing (110). As a result, the oil that has exited the penetration portion (131d) flows upward together with the refrigerant that has flowed in through the refrigerant suction pipe (117) and is introduced into the compression chamber (V).

[0117] The main frame (130) may be provided with an oil discharge path (131a1) on the outer periphery where a through-hole (131d) is formed. The oil discharge path (131a1) may be a path through which oil is discharged through one side of an oil supply groove (131a) on the outer periphery of the main frame (130). The oil discharge path (131a1) may be provided between the through-hole (131d) and the inner periphery of the casing (110). It can be understood that oil is discharged from the outer periphery of the main frame (130) to the oil discharge path (131a1) through the through-hole (131d).

[0118] A refrigerant suction passage (117a) may be provided on the inner periphery of the casing (110) in which the refrigerant suction pipe (117) is installed. The refrigerant suction passage (117a) may be a passage through which the refrigerant flows immediately after being introduced into the interior of the casing (110) through the refrigerant suction pipe (117). The refrigerant suction passage (117a) may be provided between the end of the refrigerant suction pipe (117) installed on the inner periphery of the casing (110) and the outer periphery of the main frame (130).

[0119] The oil discharge path (131a1) and the refrigerant suction path (117a) must be connected to each other so that the oil discharged to the outer periphery of the main frame (130) can flow into the compression chamber (V) together with the refrigerant flowing in from the refrigerant suction pipe (117).

[0120] To this end, the refueling groove (131a) must be arranged so that one side thereof is adjacent to one side of the refrigerant suction pipe (117). More specifically, it is preferable that the through-portion (131d) provided at the end of the second groove (131b, 131b1) of the refueling groove (131a) is arranged so as to be radially adjacent to the refrigerant suction pipe (117).

[0121] In particular, the through-hole (131d) provided at the end of the second groove (131b, 131b1) of the oil supply groove (131a) may overlap the refrigerant suction pipe (117) in the radial direction. In addition, the oil supply groove (131a) may be arranged at a position higher than the center of the refrigerant suction pipe (117) installed in the casing (110). More specifically, it is preferable that the through-hole (131d) provided at the end of the second groove (131b, 131b1) of the oil supply groove (131a) may be arranged at a position higher than the center of the refrigerant suction pipe (117) installed in the casing (110).

[0122] Due to this, a path through which oil is discharged from the oil supply groove (131a) and descends and a path through which refrigerant sucked in through the refrigerant suction pipe (117) rises can be formed to meet each other, so that the oil can flow into the compression chamber (V) along with the sucked refrigerant.

[0123] Meanwhile, the refueling groove (131a) may be formed in the main flange portion (131) provided on the outer side of the scroll support portion (134). The refueling groove (131a) may be formed in the old ring receiving portion (135).

[0124] Oil sucked through the oil passage of the rotating shaft (125) flows between the bottom of the rotating scroll (150) and the main frame (130), is provided to the thrust surface (134a) described later, and then flows in the lateral direction of the main frame (130), so that some of it falls into the oil storage space (110c), and some of it flows into the compression chamber (V) together with the suction refrigerant.

[0125] The scroll support member (134) is formed in a ring shape along the periphery of the pivot space member (133) on the upper surface of the main flange member (131). Accordingly, the scroll support member (134) can axially support the lower surface of the pivot plate member (141) described later.

[0126] In the scroll support member (134), a thrust surface (134a) can be formed as the lower surface of the pivot plate member (141) is supported in the axial direction.

[0127] The scroll support member (134) may have a portion extending in the circumferential direction.

[0128] For example, the first home (131c) may be provided on the outside of the scroll support member (134).

[0129] The first groove (131c) can be formed in a circumferential direction parallel to the scroll support portion (134) on one surface of the main flange portion (131).

[0130] Due to this, the oil supplied from the thrust surface (134a) between the rotating scroll (150) and the main frame (130) flows in the circumferential direction along the first groove (131c) on the outer side of the scroll support member (134) and forms a structure in which it easily flows to the outer periphery of the main frame (130) along the second groove (131b, 131b1).

[0131] In particular, the first groove (131c) can be arranged adjacent to the outer circumference of the scroll support member (134), so that the oil supplied from the thrust surface (134a) does not scatter outward, and a structure can be formed in which it is received directly in the first groove (131c).

[0132] The second groove (131b, 131b1) is connected to the first groove (131c) and can extend from the inner side to the outer periphery of the main flange portion (131).

[0133] Due to this, the oil flowing in the circumferential direction in the first groove (131c) is discharged to the outer periphery of the main flange portion (131) along the second groove (131b, 131b1), so that the oil can be supplied to the compression chamber (V) together with the refrigerant introduced through the refrigerant suction pipe (117).

[0134] The main frame (130) of the present invention may further include a main bearing portion (132), a rotation space portion (133), an old ring receiving portion (135), and a frame fixing portion (136).

[0135] The main bearing portion (132) is formed by protruding downward from the central lower surface of the main flange portion (131) toward the driving motor (120). The main bearing portion (132) is formed by a cylindrical shaft hole (132a) penetrating in the axial direction, and a main bearing (not shown) made of a bushing bearing is inserted into the inner circumferential surface of the shaft hole (132a) and fixedly connected. A rotation shaft (125) is inserted into the main bearing and supported in the radial direction.

[0136] The pivot space (133) is formed by recessing from the center of the main flange (131) toward the main bearing (132) to a preset depth and outer diameter. The pivot space (133) is formed to have a larger outer diameter than the rotation shaft coupling portion (143) provided in the pivot scroll (150) described later. Accordingly, the rotation shaft coupling portion (143) can be accommodated so as to be pivotable within the pivot space (133).

[0137] The Oldham ring receiving portion (135) is formed in a ring shape along the outer circumference of the scroll support portion (134) on the upper surface of the main flange portion (131). Accordingly, the Oldham ring (170) can be inserted into the Oldham ring receiving portion (135) and rotatably received.

[0138] In the present invention, the fuel refueling groove (131a) can be formed in the old ring receiving portion (135).

[0139] The frame fixing member (136) is formed by extending radially from the outer edge of the old ring receiving member (135). The frame fixing member (136) may extend in an annular shape or may extend as a plurality of protrusions spaced apart at predetermined intervals along the circumferential direction. In the present embodiment, an example in which the frame fixing member (136) is formed as a plurality of protrusions along the circumferential direction is illustrated.

[0140] Referring to FIGS. 1 to 5, the orbiting scroll (150) according to the present embodiment is placed on the upper surface of the main frame (130). The orbiting scroll (150) is provided with an anti-rotation mechanism, an old ring (170), between the main frame (130) or between the non-orbiting scroll (140) described later, so that it performs an orbiting motion.

[0141] The rotary scroll (150) according to the present embodiment includes a rotary plate portion (141), a rotary wrap (142), and a rotary shaft coupling portion (143).

[0142] The pivot plate (141) is formed in a roughly circular shape.

[0143] The orbiting wrap (142) is formed in a spiral shape by protruding at a preset height from the upper surface of the orbiting plate (141) facing the non-orbiting scroll (140). The orbiting wrap (142) is formed corresponding to the non-orbiting wrap (146) of the non-orbiting scroll (140), which will be described later, so as to perform an orbiting motion by interlocking with the non-orbiting wrap (146). The orbiting wrap (142) forms a compression chamber (V) together with the non-orbiting wrap (146).

[0144] The compression chamber (V) is composed of a first compression chamber (V1) and a second compression chamber (V2) based on the non-rotating wrap (146) described later. For example, the first compression chamber (V1) is formed on the inner side of the non-rotating wrap (146), and the second compression chamber (V2) is formed on the outer side of the non-rotating wrap (146). The first compression chamber (V1) and the second compression chamber (V2) are formed in series with a suction pressure chamber (not symbolized), an intermediate pressure chamber (not symbolized), and a discharge pressure chamber (not symbolized), respectively.

[0145] The rotary shaft coupling portion (143) is formed to protrude from the lower surface of the pivot plate portion (141) toward the main frame (130). The rotary shaft coupling portion (143) is formed in a cylindrical shape, and an eccentric pin bearing (not shown) is inserted and coupled to the inner circumferential surface of the rotary shaft coupling portion (143).

[0146] The non-orbiting scroll (140) according to the present embodiment is placed above the orbiting scroll (150). The non-orbiting scroll (140) may be fixedly coupled to the main frame (130) or may be coupled so as to be movable in the vertical direction. The present embodiment illustrates an example in which the non-orbiting scroll (140) is coupled so as to be movable in the axial direction with respect to the main frame (130).

[0147] A non-orbiting scroll (140) according to the present embodiment includes a non-orbiting plate portion (141), a non-orbiting side wall portion (142), a guide projection portion (144), and a non-orbiting wrap (146).

[0148] The non-rotating plate portion (141) is formed in a circular shape and is arranged transversely from the low pressure portion (110a) of the casing (110). A discharge port (141a), a bypass hole (151b), and a scroll side pressure hole (141c) are formed axially through the central portion of the non-rotating plate portion (141).

[0149] The discharge port (141a) is formed at a position where the discharge pressure chamber (not symbol) of the first compression chamber (V1) and the discharge pressure chamber (not symbol) of the second compression chamber (V2) are connected to each other, the bypass hole (151b) is formed to be connected to the first compression chamber (V1) and the second compression chamber (V2), and the scroll side back pressure hole (hereinafter, the first back pressure hole) is formed spaced apart from the discharge port (141a) and the bypass hole.

[0150] The non-rotating side wall portion (142) is formed in an annular shape by extending axially from the bottom edge of the non-rotating plate portion (141). An intake port (142a) is formed radially through one side of the outer circumference of the non-rotating side wall portion (142). The intake port (142a) is formed to be located above the refrigerant suction pipe (117). In other words, the intake port (142a) can be formed at a height approximately equal to the wrap height of the non-rotating wrap (146). Accordingly, the area of ​​the intake port (142a) can be formed as large as possible to increase the suction volume.

[0151] In the present invention, the suction port (142a) may be arranged radially parallel to the penetration portion (131d) of the refrigerant suction pipe (117) and the oil supply groove (131a) so that the refrigerant and oil introduced through the aforementioned refrigerant suction pipe (117) can flow upward and be easily introduced. As a result, the oil that has escaped the outer periphery of the main frame (130) can flow upward together with the suction refrigerant and then be provided to the compression chamber (V) through the suction port.

[0152] The guide protrusion (144) is formed by extending radially from the outer surface of the non-rotating side wall (142). A plurality of guide protrusions (144) may be provided at predetermined intervals along the circumference, or a single guide protrusion may be provided. In this embodiment, an example in which a plurality of guide protrusions (144) are provided is illustrated.

[0153] The non-rotating wrap (146) is formed in a spiral shape and can be formed to correspond to the rotating wrap (142) so as to be interlocked with the rotating wrap (142). The description of the non-rotating wrap (146) is replaced with the description of the rotating wrap (142).

[0154] Referring to FIGS. 1 and 2, the back pressure chamber assembly (160) is installed on the upper side of the non-orbiting scroll (140). Accordingly, the non-orbiting scroll (140) is pressed toward the orbiting scroll (150) by the back pressure force of the back pressure chamber (160a) (more precisely, the force exerted by the back pressure on the back pressure chamber), thereby sealing the compression chamber (V).

[0155] The back pressure chamber assembly (160) according to the present embodiment includes a back pressure plate (161) and a floating plate (165). The back pressure plate (161) is coupled to the upper surface of the non-rotating plate portion (141), and the floating plate (165) is slidably coupled to the back pressure plate (161) to form a back pressure chamber (160a) together with the back pressure plate (161).

[0156] The back pressure plate (161) includes a fixed plate portion (1611), a first annular wall portion (1612), and a second annular wall portion (1613).

[0157] The fixed plate (1611) is formed in the shape of a circular plate with a hollow center, and a plate-side back pressure hole (hereinafter, second back pressure hole) (1611a) penetrates axially therethrough. The second back pressure hole (1611a) is connected to the first back pressure hole (141c) and is connected to the back pressure chamber (160a). Accordingly, the second back pressure hole (1611a), together with the first back pressure hole (141c), connects the compression chamber (V) and the back pressure chamber (160a).

[0158] The first annular wall portion (1612) and the second annular wall portion (1613) are formed to surround the inner and outer surfaces of the fixed plate portion (1611) on the upper surface of the fixed plate portion (1611). The outer surface of the first annular wall portion (1612), the inner surface of the second annular wall portion (1613), the upper surface of the fixed plate portion (1611), and the lower surface of the floating plate (165) form an annular pressure relief chamber (160a).

[0159] An intermediate discharge port (1612a) communicating with the discharge port (141a) of the non-orbiting scroll (140) is formed in the first annular wall portion (1612), and a valve guide groove (1612b) into which a check valve (hereinafter, discharge valve) (145) is slidably inserted is formed on the inside of the intermediate discharge port (1612a), and a backflow prevention hole (1612c) is formed in the center of the valve guide groove (1612b). Accordingly, the discharge valve (145) selectively opens and closes between the discharge port (141a) and the intermediate discharge port (1612a) to prevent the discharged refrigerant from flowing back into the compression chamber (V).

[0160] The floating plate (165) is formed in an annular shape and may be formed of a material lighter than the back pressure plate (161). Accordingly, the floating plate (165) moves axially with respect to the back pressure plate (161) according to the pressure of the back pressure chamber (160a) and is attached to and detached from the lower surface of the high-low pressure separation plate (115).

[0161] As described above, the scroll compressor of the present invention may further include an oldham ring (170).

[0162] The old ring (170) is slidably coupled to the orbiting scroll (150), and induces the orbiting motion of the orbiting scroll (150).

[0163] The old ring (170) is accommodated in the main frame (130) so as to be placed between the main frame (130) and the orbiting scroll (150), and is slidably coupled to the orbiting scroll (150) to prevent rotation of the orbiting scroll (150).

[0164] As mentioned above, the oil supply groove (131a) can be provided on the upper surface of the main frame (130), for example, on the main flange portion (131). If the scroll compressor of the present invention further includes an Oldham ring (170), the oil supply groove (131a) may be provided on the Oldham ring receiving portion (135).

[0165] That is, the oil supply groove (131a) can be provided on one surface of the main frame (130) where the Oldham ring (170) is accommodated, thereby enabling oil to flow to the outside of the main frame (130). The Oldham ring (170) is accommodated in the Oldham ring receiving portion (135) of the main frame (130) as described above.

[0166] The Oldham ring (170) has support portions (177a, 177b) that protrude toward the main frame (130) and slide while being supported by the main frame (130), and the oil supply groove (131a) is spaced apart from the support portions (177a, 177b) so as not to overlap. As illustrated in Fig. 9, the oil supply groove (131a) should be formed in an area (135a) of the Oldham ring receiving portion (135) that does not come into contact with the support portions (177a, 177b). In addition, the Oldham ring receiving portion (135) may be provided with a support portion contact area in which the support portions (177a, 177b) come into contact with each other in a shape corresponding to the support portions (177a, 177b).

[0167] In FIGS. 9 to 11 of the present invention, the support contact area where the support portion (177a, 177b) comes into contact with the old ring receiving portion (135) is depicted in a shape corresponding to the support portion (177a, 177b).

[0168] Since the oil supply groove (131a) is spaced apart from the support portions (177a, 177b) so as not to overlap with the support portions (177a, 177b), no oil or a small amount of oil is supplied between the main frame (130) and the support portions (177a, 177b) of the old ring (170), so that sufficient oil can be supplied to the compression chamber (V). The structure in which the support portions (177a, 177b) and the oil supply groove (131a) are spaced apart will be described later.

[0169] The old ring (170) includes a ring body (173) and a key. The key may include a rotating key (171) and a non-rotating key (175).

[0170] The ring body (173) is formed in an annular shape and is provided between the main frame (130) and the rotating scroll (150) to be supported in the axial direction of the rotation shaft (125).

[0171] The key portion extends axially from the ring body (173) and is slidably inserted into the key receiving portion (144b) provided in the rotating scroll (150) and non-rotating scroll (140).

[0172] The pivot key (171) is provided with at least one protruding member formed in the old ring (170) so as to be slidably inserted into the pivot key receiving portion (151a).

[0173] As shown in FIGS. 7 and 8, the old ring (170) may have a pivot key (171) protruding from the upper surface toward the pivot scroll (150) and a non-rotating key (175) protruding from the upper surface toward the non-rotating scroll (140).

[0174] The pivot key (171) can be slidably inserted into the pivot key receiving portion (151a), and the non-swivel key (175) can be slidably coupled to the non-swivel key receiving portion (144b).

[0175] The pivot scroll (150) may be equipped with a pivot key receiving portion (151a).

[0176] The pivot key receiving portion (151a) may be formed on the opposite side of the surface where the pivot wrap (153) is formed in the pivot scroll (150). The opposite side of the surface where the pivot wrap (153) is formed may be the pivot plate portion (151) of the pivot scroll (150) described later. The pivot plate portion (151) will be described later.

[0177] The Oldham ring (170) may be provided with a support portion (177a, 177b) on the lower surface of the ring body (173).

[0178] The support member (177a, 177b) can protrude toward the main frame (130) and slide while being supported by the main frame (130).

[0179] The support members (177a, 177b) may be provided on the opposite side where the two pivot keys (171) and the two non-rotating keys (175) are located. That is, the support members (177a, 177b) may be provided in multiple pieces, and an example formed with four pieces is illustrated in Fig. 7.

[0180] The support members (177a, 177b) can be in contact with the main frame (130). The old ring (170) can be slidably supported on the main frame (130) by the support members (177a, 177b). For example, the support members (177a, 177b) can be slidably supported on the main flange (131) of the main frame (130).

[0181] In the present invention, the oil supply groove (131a) may be arranged to be spaced apart from the support portion (177a, 177b). If a portion of the oil supply groove (131a) is formed to contact or communicate with the support portion (177a, 177b), a structure is formed in which oil is supplied to the support portion (177a, 177b), so there may be a shortage of oil to be reintroduced into the compression chamber (V).

[0182] Accordingly, since the oil supply groove (131a) does not contact or communicate with the support portion (177a, 177b) and the oil supply groove (131a) is spaced from the support portion (177a, 177b), the amount of oil provided between the main frame (130) and the support portion (177a, 177b) of the old ring (170) is reduced, and relatively sufficient oil can be provided to the compression chamber (V).

[0183] For example, the friction surface between the support portion (177a, 177b) of the old ring (170) and the main frame (130) may have an elliptical shape, as illustrated in Fig. 9. It is preferable that a refueling groove (131a) be formed in the main frame (130) at a location where the friction surface is not formed.

[0184] For this purpose, for example, at least two first grooves (131c1, 131c2) may be formed that are spaced apart from each other. Each first groove (131c) may have both ends spaced apart from the support parts (177a, 177b). The first groove (131c) may be provided with spaced portions (131c11, 131c21) at both ends. In addition, each first groove (131c) may have a portion that is arranged on the inside of the support parts (177a, 177b). Fig. 10 illustrates an example in which the spaced portions (131c11, 131c21) of the first groove (131c) are spaced apart from the support parts (177a, 177b).

[0185] Compared to the first groove (131c') formed in the shape of a single circle, which is described later and illustrated in Fig. 11, the first groove (131c) formed in two can be formed to have a large width. Accordingly, by accommodating a more sufficient amount of oil and then discharging it through the second groove (131b, 131b1) to the oil discharge path (131a1), it can be introduced into the compression chamber (V) together with the suction refrigerant.

[0186] The second groove (131b, 131b1) is connected to the first groove (131c) and can be formed in a direction intersecting with the first groove (131c).

[0187] The second home (131b, 131b1) can extend from one side of the first home (131c) to the outer periphery of the main frame (130).

[0188] The second groove (131b, 131b1) may be provided in at least two forms, for example. As shown in FIGS. 7, 10, and 11, for example, the second groove (131b, 131b1) is formed to include a linear groove (131b) formed in a straight line from one side of the first groove (131c) to the outer periphery of the main frame (130), and a cross groove (131b1) intersecting at a predetermined angle from one side of the first groove (131c) to the outer periphery of the main frame (130).

[0189] In addition, the linear groove (131b) and the cross groove (131b1) are each provided with a through-hole (131d) at the end to enable oil to be discharged to the outer periphery of the main frame (130), thereby providing an oil discharge path (131a1).

[0190] Referring to Fig. 11, as another example of the first groove (131c), the first groove (131c') may be formed between the outer circumference of the scroll support member (134) and the inner side of the support member (177a, 177b) of the Oldham ring (170) so as to be spaced apart from the inner side of the support member (177a, 177b) of the Oldham ring (170). If the first groove (131c') is formed so as to be spaced apart from the inner side of the support member (177a, 177b) of the Oldham ring (170), the first groove (131c) may be formed in the shape of a circle.

[0191] In the case of the first groove (131c') formed in the shape of a single circle, it is preferable to have a smaller width than the first groove (131c) formed in two, as it must be spaced apart from the inside of all four support members (177a, 177b). In addition, in the case of the first groove (131c') formed in the shape of a single circle, it can be formed to have a longer length than the first groove (131c) formed in two, thereby enabling it to flow for a longer distance.

[0192] The scroll compressor according to the above embodiment operates as follows.

[0193] That is, when power is applied to the stator coil (1212) of the stator (121), the rotor (122) rotates together with the rotation shaft (125). Then, the orbiting scroll (150) coupled to the rotation shaft (125) performs a rotational movement with respect to the non-orbiting scroll (140), and two pairs of compression chambers (V) are formed between the orbiting wrap (142) and the non-orbiting wrap (146). The volume of these compression chambers (V) gradually decreases as they move from the outside to the inside according to the rotational movement of the orbiting scroll (150).

[0194] At this time, the refrigerant is sucked into the low pressure section (110a) of the casing (110) through the refrigerant suction pipe (117), and a portion of this refrigerant is directly sucked into each of the suction pressure chambers (not shown) forming the first compression chamber (V1) and the second compression chamber (V2), while the remainder first moves toward the driving motor (120) and is later sucked into the suction pressure chamber (not shown).

[0195] Through the rotating shaft (125), oil in the oil storage space (110c) is provided to the upper portion of the rotating shaft (125) and to the thrust surface (134a) between the rotating scroll (150) and the main frame (130), and flows to the outer periphery of the main frame (130) through the oil supply groove (131a) provided on the upper surface of the main frame (130).

[0196] When the refrigerant is sucked into the low pressure section (110a) of the casing (110) through the refrigerant suction pipe (117), the oil flowing to the outer periphery of the main frame (130) is introduced into the compression chamber (V) through the suction port of the non-rotating scroll (140) together with the refrigerant flowing upward.

[0197] Then, the refrigerant is compressed while moving along the movement path of the compression chamber (V), and a portion of the compressed refrigerant moves to the back pressure chamber (160a) through the first back pressure hole (141c) before reaching the discharge port (141a), while the refrigerant that has moved to the discharge pressure chamber pushes the discharge valve (145) and is discharged to the high pressure section (110b) through the discharge port (141a) and the intermediate discharge port (1612a), and the refrigerant fills the high pressure section (110b) and is discharged through the condenser of the refrigeration cycle through the refrigerant discharge pipe (118), repeating a series of processes.

[0198] In the present invention, oil sucked through the rotating shaft (125) flows circumferentially within the first groove (131c) on the side of the main frame (130) through the thrust surface (134a) between the main frame (130) and the orbiting scroll (150), and flows radially along the second groove (131b, 131b1), flows to the outer periphery of the main frame (130), and can then be supplied into the compression chamber (V) together with the suction refrigerant.

[0199] Oil supplied from the thrust surface (134a) between the rotating scroll (150) and the main frame (130) flows in the circumferential direction along the first groove (131c) on the outer side of the scroll support member (134), and forms a structure in which it easily flows to the outer periphery of the main frame (130) along the second groove (131b, 131b1).

[0200] In particular, the first groove (131c) can be arranged adjacent to the outer circumference of the scroll support member (134), so that a structure can be formed in which oil supplied from the thrust surface (134a) is directly received in the first groove (131c).

[0201] Due to this, the oil flowing in the circumferential direction in the first groove (131c) is discharged to the outer periphery of the main flange portion (131) along the second groove (131b, 131b1), so that the oil can be supplied to the compression chamber (V) together with the refrigerant introduced through the refrigerant suction pipe (117).

[0202] The present invention can be used in a scroll compressor having a structure capable of increasing the amount of oil supplied to a compression unit without affecting the oil supplied to an existing friction unit.

Claims

1. A casing having a sealed internal space and a refrigerant suction pipe that allows refrigerant to be introduced into the internal space; A driving unit having a stator fixed to the internal space and a rotor rotating inside the stator; A rotating shaft rotatably coupled to the above rotor; A main frame provided on one side of the above driving unit and fixed to the internal space of the casing; A rotary scroll coupled to a rotary shaft so as to be capable of rotary motion and axially supported on the main frame; and It includes a non-orbiting scroll that is coupled to the above-mentioned orbiting scroll to form a compression chamber, On one side of the main frame facing the rotating scroll, an oil supply groove is formed in one direction to allow oil to flow to the outer periphery of the main frame. A scroll compressor in which the oil supply groove is arranged so that one side thereof is adjacent to one side of the refrigerant suction pipe so that oil is supplied to the compression chamber together with the refrigerant introduced through the refrigerant suction pipe.

2. In paragraph 1, The above-mentioned refueling groove is a first groove provided in a circumferential direction on one side of the main flange; and A scroll compressor including a second groove that is connected to the first groove, formed in a direction intersecting the first groove, and formed to the outer periphery of the main frame.

3. In paragraph 1, The above mainframe, Main flange section equipped with the above-mentioned rotation axis; It includes a scroll support part provided on one side of the main flange part and supporting the rotating scroll in the axial direction, A scroll compressor in which the above-mentioned fuel groove is formed in the main flange portion provided on the outer side of the above-mentioned scroll support portion.

4. In paragraph 2, The above mainframe, Main flange section equipped with the above-mentioned rotation axis; It includes a scroll support part provided on one side of the main flange part and supporting the rotating scroll in the axial direction, The above scroll support part has a portion extending in the circumferential direction, A scroll compressor in which the first home is provided on the outer side of the scroll support member.

5. In paragraph 4, The above scroll support portion is formed to protrude in a direction toward the rotating scroll from one side of the main flange portion, A scroll compressor in which the first home is provided on the outer side of the scroll support member.

6. In paragraph 5, A scroll compressor in which the first home is positioned adjacent to the outer periphery of the scroll support member.

7. In paragraph 4, A scroll compressor in which the second groove extends from one side of the main flange portion provided with the first groove to the outer periphery of the main flange portion.

8. In paragraph 1, It further includes an old ring disposed between the main frame and the orbiting scroll and slidably coupled to the orbiting scroll to prevent rotation of the orbiting scroll. The above-mentioned Oldham ring has a support part that slides while being supported by the main flange part, A scroll compressor in which the above-mentioned fuel receptacle is arranged so as to be spaced apart from the above-mentioned support member.

9. In paragraph 8, A scroll compressor in which the support member is formed by protruding from one surface of the old ring, the support member is provided in multiple numbers, and the oil supply groove is formed between the multiple support members.

10. In paragraph 1, A scroll compressor in which the oil supply groove is positioned higher than the center of the refrigerant suction pipe installed in the casing so that the oil discharged from the oil supply groove and the descending path meet each other and the refrigerant suctioned through the refrigerant suction pipe and the rising path meet each other.

11. In paragraph 1, On one side of the above-mentioned oil refueling groove, a penetration formed through the outer periphery of the main frame is provided, and the main frame is provided with an oil discharge path through which oil is discharged to the outer periphery where the penetration is formed. A scroll compressor in which the inner circumference of the casing in which the above refrigerant suction pipe is installed is provided with a refrigerant suction path, and the above oil discharge path is arranged to be connected to the above refrigerant suction path.

12. A casing having a sealed internal space and a refrigerant suction pipe that allows refrigerant to be introduced into the internal space; A driving unit having a stator fixed to the internal space and a rotor rotating inside the stator; A rotating shaft rotatably coupled to the above rotor; A main frame provided on one side of the above driving unit and fixed to the internal space of the casing; A rotary scroll coupled to a rotary shaft so as to be capable of rotary motion and axially supported on the main frame; A non-orbiting scroll coupled to the above-mentioned orbiting scroll to form a compression chamber; and An Oldham ring is included, which is accommodated in the main frame and is slidably coupled to the orbiting scroll to prevent rotation of the orbiting scroll, and is arranged between the main frame and the orbiting scroll. On one side of the main frame where the old ring is received, an oil supply groove is provided to allow oil to flow to the outside of the main frame. The above-mentioned Oldham ring has a support member that protrudes toward the main frame and slides while being supported by the main frame, A scroll compressor in which the above-mentioned fuel grooves are spaced apart from each other so as not to overlap with the above-mentioned support member.

13. In paragraph 12, The above refueling groove is a first groove provided in a circumferential direction on one side of the main frame; and A scroll compressor including a second groove that is connected to the first groove, formed in a direction intersecting the first groove, and formed to the outer periphery of the main frame.

14. In paragraph 13, A scroll compressor in which the first groove is formed of at least two grooves spaced apart from each other, and a support member is spaced apart between both ends of each first groove.

15. In paragraph 13, A scroll compressor in which the first groove is formed in the shape of a circle and is spaced apart from the inner side of the support.

16. In paragraph 12, The above mainframe, A main flange portion accommodated inside the above casing; A scroll support part provided on one side of the main flange part and supporting the rotating scroll in the axial direction; and It includes an old ring receiving portion formed in a ring shape along the outer surface of the scroll support portion on one side of the main flange portion, The above-mentioned fuel refueling groove is a scroll compressor formed in the above-mentioned old ring receiving portion.

17. In paragraph 13, The above mainframe, A main flange portion accommodated inside the above casing; A scroll support part provided on one side of the main flange part and supporting the rotating scroll in the axial direction; and It includes an old ring receiving portion formed in a ring shape along the outer surface of the scroll support portion on one side of the main flange portion, The above first home is a scroll compressor provided in the above old ring receiving section.

18. In paragraph 12, A scroll compressor in which the oil supply groove is positioned higher than the center of the refrigerant suction pipe installed in the casing so that the oil discharged from the oil supply groove and the descending path meet each other and the refrigerant suctioned through the refrigerant suction pipe and the rising path meet each other.

19. In paragraph 12, On one side of the above-mentioned oil refueling groove, a penetration formed through the outer periphery of the main frame is provided, and the main frame is provided with an oil discharge path through which oil is discharged to the outer periphery where the penetration is formed. A scroll compressor in which the inner circumference of the casing in which the above refrigerant suction pipe is installed is provided with a refrigerant suction path, and the above oil discharge path is arranged to be connected to the above refrigerant suction path.

20. In paragraph 13, The above second home, A linear groove formed in a straight line from one side of the first groove to the outer periphery of the main frame, A scroll compressor including a cross-shaped groove intersecting the outer periphery of the main frame at a predetermined angle from one side of the first groove.

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