Scroll compressor
Patent Information
- Application Number
- KR1020250024508
- Authority / Receiving Office
- KR · KR
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-09-01
Smart Images
Figure PAT00002_ABST
Abstract
Description
Technology Field
[0001] The present invention relates to a scroll compressor. Background Technology
[0002] An air conditioner is a home appliance designed to maintain indoor air in a state suitable for its intended use or purpose. Such air conditioners drive a refrigeration cycle that performs the processes of compression, condensation, expansion, and evaporation of a refrigerant, thereby enabling cooling or heating of the indoor space.
[0003] Scroll compressors are known as the compressors used in such air conditioners.
[0004] As is known, a scroll compressor is a compressor that forms a compression chamber consisting of a suction chamber, an intermediate pressure chamber, and a discharge chamber between a rotating scroll and a stationary scroll that mesh together and rotate relative to each other. Since suction, compression, and discharge occur continuously while the rotating scroll is rotating, such a scroll compressor has a small number of parts and enables high-speed rotation. Furthermore, because the torque required for compression fluctuates minimally and suction and compression occur continuously, noise and vibration are low. For these reasons, scroll compressors are widely used to compress refrigerants in air conditioners.
[0005] Recently, in order to mitigate global warming caused by refrigerants used in air conditioners, it is recommended to use alternative refrigerants with a low Global Warming Potential (GWP) in air conditioners.
[0006] However, alternative refrigerants with low GWP, such as R290, have a problem in that they have lower density compared to conventionally used refrigerants. Accordingly, to secure the same cooling and heating capacity as conventional refrigerants using low-GWP alternative refrigerants, it is necessary to increase the stroke volume of the scroll compressor.
[0007] Increasing the size of the compressor to increase the stroke volume of a scroll compressor raises manufacturing costs. To curb this increase in manufacturing costs, it would be desirable to increase the stroke volume while maintaining the compressor size—specifically the casing size—at the same level as the existing model.
[0008] To this end, one might consider reducing the thickness of the fixed wrap of the fixed scroll and the swivel wrap of the swivel scroll. However, reducing the thickness of the fixed wrap or the swivel wrap is undesirable because it can have a negative impact on the strength or durability of the fixed wrap and the swivel wrap.
[0009] Meanwhile, the frame, which forms a space for accommodating the slewing scroll by being coupled with the fixed scroll at the rear of the slewing scroll, is joined to the fixed scroll by fastening a fixing bolt penetrating the edge of the fixed scroll to the edge of the frame, that is, the frame side wall. Since a minimum thickness is required for the frame side wall to fasten these fixing bolts, it is not easy to reduce the stroke volume of the compression chamber by reducing the thickness of the frame side wall. The problem to be solved
[0010] The objective of the present invention is to provide a scroll compressor that enables the use of alternative refrigerants with low GWP by increasing the stroke volume of the compression chamber.
[0011] Another objective of the present invention is to provide a scroll compressor that can increase the stroke volume of the compression chamber without increasing the overall size of the compressor, thereby preventing an increase in manufacturing costs.
[0012] Another objective of the present invention is to provide a scroll compressor that can increase the stroke volume of the compression chamber without increasing the overall size of the compressor by reducing the thickness of the frame sidewall portion by changing the combined structure of the frame and the fixed scroll. means of solving the problem
[0013] To achieve the objective of the present invention, a scroll compressor comprising a casing, a drive unit, a frame, a pivot scroll, a fixed scroll, and a support member may be provided. The drive unit may be inserted into and fixed within the internal space of the casing. The frame may be provided on one side of the drive unit and supported in the casing in a first axial direction. The pivot scroll may be supported axially by the frame and perform pivoting motion. The fixed scroll may be supported on one side of the frame with the pivot scroll in between and may form a compression chamber together with the pivot scroll. The support member may support the fixed scroll, which is positioned away from the pivot scroll, in the casing in a second axial direction. The support member may be inserted into and fixed within the inner circumference of the casing.
[0014] As a result, the frame and the fixed scroll supported on one side of the frame can be joined together by a casing that supports the frame in a first axial direction and a support member that supports the fixed scroll in a second axial direction. Accordingly, since it is not necessary to use fixing bolts to join the frame and the fixed scroll as in the past, the thickness of the frame side wall portion of the frame can be further reduced, thereby increasing the stroke volume of the compression chamber. Due to this increased stroke volume, it becomes possible to implement a scroll compressor that uses a low GWP refrigerant with a lower density than conventional refrigerants.
[0015] For example, the support member may be formed in an annular shape and heat-sewn to the inner surface of the casing.
[0016] As a result, the support member can support the fixed scroll evenly across the frame.
[0017] For example, the inner surface of the support member may be formed in the shape of a smooth tube.
[0018] As a result, the manufacturing of the support member is easy, and interference with other members can be minimized when inserting the support member into the casing.
[0019] As another example, the support member may have at least one support protrusion formed on its inner surface.
[0020] Since the rigidity of the support member can be reinforced by these support protrusions, the support member can sufficiently support the fixed scroll even if the thickness or width of the support member is reduced.
[0021] For example, the casing comprises a cylindrical shell into which the frame and the fixed scroll are inserted, and a cap covering the opening of the cylindrical shell, and the support member may be formed by the cap inserted toward the fixed scroll from one opening of the cylindrical shell.
[0022] As a result, the fixed scroll can be supported using a cap without the need for a separate component, which simplifies the configuration and lowers manufacturing costs.
[0023] For example, a support surface is formed with a step on the inner surface of the casing, and the frame can be supported in a first axial direction with one side thereof in close contact with the support surface.
[0024] As a result, the frame can be simply supported in the first axial direction on the casing without performing complex and time-consuming tasks such as welding, thereby simplifying the manufacturing process of the compressor.
[0025] For example, the radial thickness of the support member may be formed to be greater than or equal to the radial width of the support surface, or the axial height of the support member may be formed to be greater than or equal to the radial width of the support surface.
[0026] As a result, the support force of the fixed scroll of the support member can be increased.
[0027] For example, a first position alignment groove is formed on the outer surface of the frame, and a second position alignment groove is formed on the outer surface of the fixed scroll along the axial direction with respect to the first position alignment groove, and a position alignment member inserted between the frame and the fixed scroll may be inserted into the first position alignment groove and the second position alignment groove.
[0028] As a result, in the process of manufacturing a scroll compressor, the circumferential position of the fixed scroll frame can be easily and quickly aligned, which can reduce working time and improve productivity.
[0029] For example, a discharge passage is formed in the frame and the fixed scroll to guide the refrigerant discharged from the compression chamber into the internal space of the casing, and a sealing member is provided between the frame and the fixed scroll, and the sealing member may be provided on the inner circumference side of the discharge passage.
[0030] Since a sealing member is provided on the inner circumference side of the discharge passage, it is possible to prevent the discharged refrigerant guided through the discharge passage from leaking into the space formed between the frame and the fixed scroll, for example, the intermediate pressure space, through the gap between the frame and the fixed scroll.
[0031] For example, at least one of the above frame and the above fixed scroll facing it may have a sealing member receiving groove formed in an annular shape, and the sealing member may be formed in an annular shape and inserted into the sealing member receiving groove.
[0032] As a result, sealing between the frame and the fixed scroll can be achieved simply and easily without using fixing bolts as in the conventional method.
[0033] For example, the discharge passage may be formed by penetrating the interior of the fixed scroll and the interior of the frame.
[0034] As a result, the discharge passage can be formed without interference with other parts, thereby increasing the design freedom of the compressor.
[0035] As another example, the discharge passage may be formed by being recessed into the outer surface of the fixed scroll and the outer surface of the frame.
[0036] As a result, the thickness of the frame sidewalls can be further reduced, allowing the stroke volume of the compression chamber to be further increased.
[0037] In this case, at least one passage groove is formed along the circumferential direction on the inner surface of the casing, and the passage groove may be formed to protrude in a direction toward the outer surface of the casing so as to correspond to the discharge passage.
[0038] As a result, the machining of the discharge passages formed on the outer surface of the fixed scroll and the outer surface of the frame can be minimized. Accordingly, the thickness of the frame sidewalls can be further reduced, thereby increasing the stroke volume of the compression chamber. Effects of the invention
[0039] According to the present invention, a frame and a fixed scroll can be joined together by using a casing that supports the frame in a first axial direction and a support member that supports the fixed scroll in a second axial direction. Accordingly, since it is not necessary to use fixing bolts to join the frame and the fixed scroll as in the prior art, the thickness of the frame sidewall can be further reduced. The thickness of the frame sidewall reduced in this way can be allocated to the wrap design, thereby increasing the stroke volume of the compression chamber. Accordingly, a scroll compressor can be realized that achieves the same capacity as a compressor using a conventional refrigerant while using a low GWP refrigerant with a lower density than the conventional refrigerant.
[0040] Furthermore, according to the present invention, by changing the combined structure of the frame and the fixed scroll as mentioned above to reduce the thickness of the frame sidewall, the stroke volume of the compression chamber can be increased without increasing the overall size of the compressor. Accordingly, a scroll compressor using a low GWP refrigerant can be realized while minimizing the increase in manufacturing costs compared to conventional scroll compressors.
[0041] In addition, according to the present invention, a sealing member provided between the frame and the fixed scroll is formed on the frame and the fixed scroll and is provided on the inner circumference of the discharge passage that guides the refrigerant discharged from the compression chamber into the internal space of the casing. Accordingly, leakage of the high-pressure discharged refrigerant guided into the internal space of the casing through the frame and the fixed scroll can be prevented with a simple configuration. Brief explanation of the drawing
[0042] FIG. 1 is a longitudinal cross-sectional view illustrating the interior of a scroll compressor according to one embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view illustrating the fixed structure of a fixed scroll and a frame of a scroll compressor according to one embodiment of the present invention. FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2. FIG. 4 is a cross-sectional view illustrating another example of the support member shown in FIG. 3. FIG. 5 is a cross-sectional view along the VV line of FIG. 2. FIG. 6 is a perspective view illustrating a structure for aligning the circumferential positions of a fixed scroll and a frame in a scroll compressor according to an embodiment of the present invention. FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 6. FIG. 8 is a cross-sectional view illustrating the change in thickness of the frame sidewall portion according to the prior art and the present invention. FIG. 9 is a cross-sectional view illustrating another example of a discharge passage. FIG. 10 is a cross-sectional view taken along line XX of FIG. 9. FIG. 11 is a cross-sectional view illustrating a scroll compressor according to another embodiment of the present invention. Specific details for implementing the invention
[0043] Hereinafter, a scroll compressor according to the present invention will be described in detail based on an embodiment illustrated in the attached drawings. In the following description, in order to clarify the features of the present invention, the illustration and description of some components that are obvious to those skilled in the art to which the present invention pertains may be omitted.
[0044] In addition, as used in the following description, "upper side" refers to the direction away from the support surface supporting the scroll compressor according to an embodiment of the present invention, and "lower side" refers to the direction closer to the support surface. That is, when viewed from the perspective of the electric motor (or drive motor) and the compressor, the electric motor (or drive motor) side refers to the upper side. "Lower side" refers to the compressor side referring to the lower side.
[0045] Additionally, the term "axial direction" used in the following description refers to the longitudinal direction of the axis of rotation. "Axial direction" can be understood as the up-and-down direction. "Radial direction" refers to the direction intersecting the axis of rotation.
[0046] In addition, the scroll compressor described below is explained using a hermetic scroll compressor as an example, in which the electric motor (or drive motor) and the compressor are provided within the casing. However, the same can be applied to an open-type compressor in which the electric motor (or drive motor) is provided outside the casing and connected to the compressor provided inside the casing.
[0047] In addition, the following description uses a vertical scroll compressor in which the electric motor and the compressor are arranged in the vertical axial direction, and the compressor is located below the electric motor (or drive motor), as an example. However, this can be applied equally to a horizontal scroll compressor in which the electric motor (or drive motor) and the compressor are arranged left and right, as well as to an upper scroll compressor in which the compressor is located above the electric motor (or drive motor).
[0048] In addition, the following description uses a high-pressure scroll compressor as an example, in which the refrigerant suction pipe forming the suction passage is directly connected to the compression section, and the refrigerant discharge pipe communicates with the internal space of the casing, so that the internal space of the casing forms the discharge pressure.
[0049] FIG. 1 is a longitudinal cross-sectional view illustrating the interior of a scroll compressor according to an embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating an enlarged compression section of FIG. 1.
[0050] Referring to FIG. 1, a scroll compressor (1) according to one embodiment of the present invention may have a drive unit (20) installed on the upper side of the inside of a casing (10) to generate rotational force and a drive motor, and a compression unit (30) installed on the lower side of the drive unit (20) to receive rotational force from the drive unit and compress a refrigerant.
[0051] The casing (10) may consist of a cylindrical shell (11) and an upper cap (12) and a lower cap (13) that cover the upper and lower parts of the cylindrical shell (11) respectively to form a sealed container together with the cylindrical shell (11). The internal space of the sealed casing (10) may be separated into an upper space (10a) where the electric motor (20) is installed and a lower space (10b) where the compression unit (30) is installed. An intermediate space (10c) may be provided between the electric motor (20) and the compression unit (30).
[0052] A refrigerant suction pipe (15) can be installed through the side of the cylindrical shell (11) to be directly connected to the suction chamber of the compression section (30), and a refrigerant discharge pipe (16) can be installed on the upper part of the upper cap (12) to be connected to the upper space (10a) of the casing (10).
[0053] The refrigerant discharge pipe (16) is a passage for discharging compressed refrigerant discharged from the compression section (30) to the upper space (10a) of the casing to the outside. The refrigerant discharge pipe (16) is extended so as to be inserted into the middle of the upper space (10a) of the casing (10). By doing so, the upper space (10a) of the casing (10) can form a kind of oil separation space for separating oil mixed in the refrigerant. In some cases, a separate oil separator (not shown) for separating oil mixed in the refrigerant may be connected to the refrigerant discharge pipe (16) inside the casing (10) including the upper space (10a) or within the upper space (10a).
[0054] The electric motor (20) consists of a stator (21) and a rotor (22) that rotates inside the stator (21). The stator (21) is provided with teeth and slots forming a plurality of coil winding sections (not shown) along the circumferential direction on its inner surface, and coils (25) are wound in these teeth and slots. The coils (25) can be electrically connected to an external power source through a power cable (not shown) that is coupled through the casing (10).
[0055] The rotor (22) may include a rotor core and a permanent magnet.
[0056] A rotating shaft (50), described later, can be coupled to the center of the rotor core. Accordingly, the rotational force of the electric motor (20) is transmitted through the rotating shaft (50) to the rotating scroll (33) forming the compression part (30), and the rotating scroll (33) rotates relative to the fixed scroll (32).
[0057] A frame (31) forming a compression section (30) can be fixedly coupled to the inner circumference of a casing (10), i.e., a cylindrical shell (11), at a predetermined interval on the lower side of the electric section (20). An annular frame side wall section (311) can be formed on the edge of the frame (31). A sealing member receiving groove (3112) for receiving a sealing member (38), which will be described later, can be formed on the lower surface of the frame side wall section (311).
[0058] As illustrated in more detail in FIG. 2, the cylindrical shell (11) may include a support surface portion (112). The support surface portion (112) may be formed in a stepped shape having a support surface extending radially. By the upper edge of the frame (31) being in close contact with the support surface portion (112), the frame (31) may be supported in a first axial direction by the support surface portion (112).
[0059] The support surface (112) may be formed in an annular shape over the entire inner surface of the cylindrical shell (11), or a plurality of support surface (112) may be formed at predetermined intervals along the circumference of the inner surface of the cylindrical shell (11).
[0060] As described above, the upper edge of the frame (31) can be supported by being seated on the support surface (112) of the cylindrical shell (11). In addition, by the support member (37) described later supporting the fixed scroll (32) in the casing (10) in the second axial direction, the frame (31) can be fixed so as not to move in the axial direction between the support surface (112) of the cylindrical shell (11) and the fixed scroll (32).
[0061] Meanwhile, in an alternative example where the cylindrical shell (11) does not include a support surface (112), the frame (31) can be fixedly connected to the casing (10) by welding the outer surface of the frame (31) to the inner surface of the cylindrical shell (11).
[0062] A first bearing portion (312) may be formed at the center of the frame (31), having a first bearing hole (312a) formed through in the axial direction. The main bearing portion (51) of the rotation shaft (50) is rotatably inserted into the first bearing hole (312a) of the first bearing portion (312) and supported in the radial direction.
[0063] A fixed scroll (32) may be installed on the lower side of the frame (31) with a pivoting scroll (33) eccentrically coupled to a rotation axis (50) in between. The fixed scroll (32) may be fixed so as not to move axially relative to the frame (31) by a support member (37) to be described later.
[0064] The fixed scroll (32) may have a fixed plate portion (321) formed in a roughly circular shape, and a scroll side wall portion (322) formed at the edge of the fixed plate portion (321) that is coupled to the lower edge of the frame (31).
[0065] On the upper surface of the fixed plate portion (321), a fixed wrap (323) may be formed to form a compression chamber (Vc) by engaging with the rotating wrap (332) of the rotating scroll (33) to be described later.
[0066] A second bearing portion (326) having a second bearing hole (326a) may be formed at the center of the fixed plate portion (321). The sub-bearing portion (52) of the rotation shaft (50) is rotatably inserted into the second bearing hole (326a) of the second bearing portion (326) and supported in the radial direction.
[0067] A suction port (324) is formed through one side of the scroll side wall (322) to communicate with the refrigerant suction pipe (15) and the suction chamber, and a discharge port (325) through which compressed refrigerant is discharged can be formed in the central part of the fixed end plate (321) to communicate with the discharge chamber.
[0068] An annular support member (37) may be disposed on the lower surface of the fixed end plate portion (321) of the fixed scroll (32). The support member (37) serves to support the frame (31) and the fixed scroll (32) so that they do not move in the axial direction while the frame side wall portion (311) and the scroll side wall portion (322) are in close contact with the support surface portion (112) of the cylindrical shell (11). A structure for supporting the fixed scroll (32) on the frame (31) using the support member (37) will be explained in more detail later.
[0069] Also, on the lower side of the fixed scroll (32), the refrigerant discharged from the compression chamber (Vc) is discharged through the discharge passage (P) to be described later. G A discharge cover (34) for guiding to ) may be attached. The discharge cover (34) has an internal space that accommodates the discharge port (325), and at the same time, a discharge passage (P) that guides the refrigerant discharged from the compression chamber (Vc) through the discharge port (325) to the upper space (10a) of the casing (10), more precisely, the space between the electric motor (20) and the compression unit (30). G It can be formed to accommodate the entrance of ).
[0070] The rotating scroll (33) can be installed to rotate between the frame (31) and the fixed scroll (32).
[0071] The rotating scroll (33) may have a rotating plate portion (331) formed in a roughly circular shape. On the lower surface of the rotating plate portion (331), a rotating wrap (332) may be formed to form a compression chamber (Vc) by engaging with a fixed wrap (323).
[0072] The pivot wrap (332) can be formed spirally together with the fixed wrap (323). However, it is not necessarily limited to this and can be formed in various other shapes. For example, the pivot wrap (332) may have a shape formed by connecting multiple arcs with different diameters and origins, and the outermost curve may be formed in a roughly elliptical shape having a major axis and a minor axis. The fixed wrap (323) may also be formed in the same way as the pivot wrap.
[0073] In the central part of the pivot plate portion (331), a pivot shaft coupling portion (333) may be formed through in the axial direction, which forms the inner end of the pivot wrap (332) and into which the eccentric portion (53) of the pivot shaft (50) is rotatably inserted and coupled.
[0074] The outer periphery of the rotational shaft coupling part (333) is connected to the pivoting wrap (332) to form a compression chamber (Vc) together with the fixed wrap (323) during the compression process. In the following description, the rotational shaft coupling part (333) may be collectively referred to as the pivoting wrap (332) together with the pivoting wrap (332).
[0075] The compression chamber (Vc) is formed between the fixed end plate (321) and the fixed wrap (323) of the fixed scroll (32), and between the rotating wrap (332) and the rotating end plate (331) of the rotating scroll (33). This compression chamber (Vc) can be formed by continuously forming a suction chamber, an intermediate pressure chamber, and a discharge chamber along the direction of travel of the fixed wrap (323) and the rotating wrap (332). Additionally, the compression chamber (Vc) can be divided into a first compression chamber between the inner surface of the fixed wrap (323) and the outer surface of the rotating wrap (332), and a second compression chamber between the outer surface of the fixed wrap (323) and the inner surface of the rotating wrap (332).
[0076] Meanwhile, the rotating scroll (33) can be installed to rotate between the frame (31) and the fixed scroll (32). Additionally, an Oldham ring (35) that prevents rotation of the rotating scroll (33) can be installed between the upper surface of the rotating scroll (33) and the lower surface of the corresponding frame (31).
[0077] The edge of the rotating plate section (331) of the rotating scroll (33), that is, the outer surface of the rotating plate section (331), can form an intermediate pressure space (Sm) together with the frame (31) and the fixed scroll (32). The intermediate pressure space (Sm) is connected to the compression chamber (Vc) through an intermediate pressure passage (not shown) to form an intermediate pressure (back pressure). Accordingly, the rotating plate section (331) receives the back pressure of the intermediate pressure space (Sm) and is axially supported toward the fixed scroll (32), thereby preventing leakage of the compression chamber (cV).
[0078] Meanwhile, the rotation shaft (50) is formed to be long in the axial direction, and one end can be connected to the electric motor (20) and the other end to the compression part (30). In other words, the upper end of the rotation shaft (50) is connected to be fixed to the rotor (22), and the lower end of the rotation shaft (50) can be inserted rotatably by passing through the frame (31), the pivot scroll (33), and the fixed scroll (32) in sequence, which will be described later.
[0079] For example, the upper half of the rotating shaft (50) can be pressed into the rotor (22) of the transmission unit (20), and the lower half of the rotating shaft (50) can be eccentrically coupled to the pivoting scroll (33). Accordingly, the rotating shaft (50) can transmit the rotational force of the transmission unit (120) to the pivoting scroll (33) described later. Then, the pivoting scroll (33) eccentrically coupled to the rotating shaft (50) will pivot relative to the fixed scroll (32).
[0080] A main bearing portion (51) may be formed in the lower half of the rotating shaft (50) to be inserted into the first bearing hole (312a) of the frame (31) and supported in the radial direction, and a sub-bearing portion (52) may be formed on the lower side of the main bearing portion (51) to be inserted into the second bearing hole (326a) of the fixed scroll (32) and supported in the radial direction. An eccentric portion (53) may be formed between the main bearing portion (51) and the sub-bearing portion (52) to be inserted into and coupled to the rotating shaft coupling portion (333).
[0081] An oil feeder (60) for pumping oil filled in the lower space (10b) may be attached to the lower end of the rotating shaft (50), that is, the lower end of the sub-bearing part (52). The oil feeder (60) may consist of an oil supply pipe (61) that is inserted into and connected to the oil supply passage (50a) of the rotating shaft (50), and a blocking member (62) that accommodates the oil supply pipe (61) to block the intrusion of foreign matter. The oil supply pipe (61) may be positioned to pass through the discharge cover (34) and be submerged in the oil of the lower space (10b).
[0082] The unexplained symbol 70 in the drawing is an accumulator.
[0083] Meanwhile, a support member (37) may be installed on the lower side of the fixed scroll (32). Specifically, the support member (37) is installed in close contact with the lower surface of the fixed end plate (321) of the fixed scroll (32). Additionally, the support member (37) may be formed in an annular shape, and its outer surface may be fixed to the inner surface of the cylindrical shell (11).
[0084] As shown in FIG. 3, the inner surface of the support member (37) formed in an annular shape may be formed in a smooth tube shape. Alternatively, as shown in FIG. 4, at least one support protrusion (371) may be formed on the inner surface of the support member (37). The rigidity of the support member (37) may be further enhanced by this support protrusion (371).
[0085] The radial thickness (W1) of the support member (37) may be formed to be greater than or equal to the radial width (W2) of the support surface (112). Alternatively, or in addition thereto, the axial height (H1) of the support member (37) may be formed to be greater than or equal to the radial width (W2) of the support surface (112). By forming the radial thickness (W1) and / or axial height (H1) of the support member (37) to be greater than or equal to the radial width (W2) of the support surface (112), the supporting force of the support member (37) on the fixed scroll (32) may be further strengthened.
[0086] With such a support member (37), the upper surface of the scroll side wall portion (322) of the fixed scroll (32) is in close contact with the lower surface of the frame side wall portion (311) of the frame (31), and the frame (31) and the fixed scroll (32) can be fixed so as not to move in the axial direction between the support surface portion (112) of the cylindrical shell (11) supporting the upper edge of the frame (31) and the support member (37) supporting the lower surface of the fixed scroll (32).
[0087] The process of fixing the frame (31) and the fixed scroll (32) between the supporting surface (112) of the cylindrical shell (11) and the supporting member (37) can be performed as follows.
[0088] First, with the electric motor (20) positioned in the upper space (10a) of the casing (10), the frame (31) of the compression unit (30) is positioned on one side of the inner surface of the cylindrical shell (11). Specifically, the upper edge of the frame (31) is placed on the support surface (112) of the cylindrical shell (11). Alternatively, in an example where the cylindrical shell (11) does not include the support surface (112), the frame (31) can be positioned on the inner surface of the cylindrical shell (11) by welding and fixing the frame (31) to the inner surface of the cylindrical shell (11).
[0089] Next, the pivot scroll (33) is inserted into the eccentric portion (53) of the rotation axis (50) and coupled. Then, the fixed scroll (32) is inserted into the cylindrical shell (11), and pushed in so that the upper surface of the scroll side wall portion (322) of the fixed scroll (32) is in close contact with the lower surface of the frame side wall portion (311) of the frame (31).
[0090] In the process of inserting the fixed scroll (32) into the cylindrical shell (11), the circumferential position of the fixed scroll (32) can be aligned with respect to the frame (31) using the position alignment member (39) to be described later.
[0091] Next, the support member (37) is inserted into the cylindrical shell (11) in close contact with the lower surface of the fixed scroll (32) and fixed to the cylindrical shell (11). The support member (37) is formed in an annular shape and can be heat-sewn to the inner surface of the cylindrical shell (11). Accordingly, the process of attaching the fixed scroll to the frame can be simplified.
[0092] The term "hot shrink" generally refers to a hot press-fit in which a support member (37) is inserted into a cylindrical shell (11) while the inner diameter of the cylindrical shell (11) is expanded by heating the cylindrical shell (11), and the cylindrical shell (11) is cooled so that the support member (37) is pressed into the inner surface of the cylindrical shell (11). However, the term "hot shrink" as used in this specification may also be used to include a cold press-fit in which, conversely to hot press-fit, the support member (37) is inserted into a cylindrical shell (11) while the outer diameter of the support member (37) is reduced by cooling it with liquid nitrogen, and the cooled support member (37) is pressed into the inner surface of the cylindrical shell (11) by allowing it to return to room temperature.
[0093] Fixing of the support member (37) to the cylindrical shell can be performed by using a jig not shown to press the support member (37) toward the frame (31). By doing so, after shrink fitting, the upper surface of the scroll side wall portion (322) of the fixed scroll (32) can be maintained in close contact with the lower surface of the frame side wall portion (311) of the frame (31).
[0094] Meanwhile, a sealing member (38) may be interposed between the scroll side wall portion (322) of the fixed scroll (32) and the frame side wall portion (311) of the frame (31).
[0095] The sealing member (38) replaces the conventional fixing bolt and allows the intermediate pressure space (Sm) to leak, specifically the discharge passage (P) described later. G It serves to prevent high-pressure discharge refrigerant moving from the lower space of the casing (10), specifically from the internal space of the discharge cover (34) to the upper space (10a) through the gap between the scroll side wall (322) and the frame side wall (311) into the intermediate pressure space (Sm).
[0096] Referring to FIGS. 2 and FIGS. 5, a sealing member receiving groove (3112) is formed on the lower surface of the frame side wall (311), and an annular sealing member (38), i.e., an O-ring, can be inserted into the sealing member receiving groove (3112).
[0097] The sealing member receiving groove (3112) may be formed by being recessed to a predetermined depth from the lower surface of the frame side wall (311). The sealing member receiving groove (3112) may be formed with a roughly rectangular cross-section. Additionally, the sealing member receiving groove (3112) may be formed in an annular shape along the perimeter of the lower surface of the frame side wall (311).
[0098] The sealing member (38) may be formed with a circular cross-section having a diameter larger than the larger of the width and depth of the sealing member receiving groove (3112). The sealing member (38) may be, for example, an O-ring of the G130 standard.
[0099] In this embodiment, a sealing member receiving groove (3112) in which a sealing member (38) is received is shown to be formed in the frame side wall portion (311) of the frame (31). However, the sealing member receiving groove (3112) may be formed by being recessed to a predetermined depth in an annular shape along the circumference of the upper surface of the scroll side wall portion (322) of the fixed scroll (32) instead of the frame side wall portion (311), or it may be formed facing each other on both the lower surface of the frame side wall portion (311) of the frame (31) and the upper surface of the scroll side wall portion (322) of the fixed scroll (32).
[0100] Meanwhile, a discharge passage (P) that guides the refrigerant discharged from the compression chamber to the discharge cover (34) to the upper space (10a) of the casing (10). G ) can be formed to pass through the scroll side wall portion (322) of the fixed scroll (32) and the frame side wall portion (311) of the frame (31).
[0101] Referring to FIG. 2, the discharge passage (P G ) is the first discharge passage (P G1 ) and the second discharge passage (P G2It may include ). The first discharge passage (P G1 ) and the second discharge passage (P G2 ) can be formed to communicate with the interior of the flow separation unit (40) by sequentially penetrating the interior of the scroll side wall portion (322) of the fixed scroll (32) and the interior of the frame side wall portion (311) of the frame (31) from the outer side of the sealing member (38).
[0102] Specifically, the first discharge passage (P G1 ) passes through the interior of the scroll side wall (322) in a bent shape toward the outer circumference of the sealing member (38) on the upper surface of the scroll side wall (322) from one side of the lower surface of the scroll side wall (322) of the fixed scroll (32).
[0103] Second discharge passage (P G2 ) is the first discharge passage (P G1 It extends from the lower surface of the frame side wall (311) of the frame (31) to the upper surface of the frame side wall (311) that communicates with the Euro separation unit (40) so as to be connected to the frame side wall (311).
[0104] In addition, as shown in FIG. 5, such a discharge passage (P G ), that is, the first discharge passage (P G1 ) and the second discharge passage (P G2 ) can be formed in multiple adjacent to each other along the circumference of the scroll sidewall (322) and the frame sidewall (311).
[0105] Accordingly, the refrigerant discharged from the compression chamber into the interior of the discharge cover (34) is discharged through the first discharge passage (P G1 ) and the second discharge passage (P G2 You can move to the intermediate space (10c) by passing through ) in order.
[0106] In addition, the discharge passage (P G ) is formed on the outer circumference of the sealing member (38), thereby forming a discharge passage (P G High-pressure discharge refrigerant flowing through ) can be prevented from leaking into the intermediate pressure space (Sm) through the gap between the scroll side wall (322) of the fixed scroll (32) and the frame side wall (311) of the frame (31).
[0107] Meanwhile, the discharge passage (P G ) is the scroll side wall portion (322) of the fixed scroll (32) (first discharge passage (P G1 )) and the frame side wall portion (311) of the frame (31) (second discharge passage (P G2 Because it is formed across )), the discharge passage (P G In order for the fixed scroll (32) and the frame (31) to be accurately aligned in the circumferential direction so that they can be accurately connected without being misaligned between the scroll side wall (322) and the frame side wall (311), a position alignment member (39) may be provided between the fixed scroll (32) and the frame (31).
[0108] FIG. 6 is a perspective view illustrating a position alignment member (39) for aligning the circumferential position of a fixed scroll (32) and a frame (31), and FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 6.
[0109] As illustrated in FIGS. 6 and 7, a first position alignment groove (3113) may be formed on one side of the outer surface of the frame side wall portion (311) of the frame (31). On the outer surface of the scroll side wall portion (322) of the fixed scroll (32), a second position alignment groove (3221) may be formed at a position corresponding to the first position alignment groove (3113).
[0110] The axial length of the position alignment member (39) may be equal to the sum of the depth of the first position alignment groove (3113) and the depth of the second position alignment groove (3221).
[0111] The circumferential position of the frame (31) and the fixed scroll (32) relative to each other can be aligned by inserting the position alignment member (39) through the first position alignment groove (3113) and the second position alignment groove (3221).
[0112] In FIGS. 6 and 7, the position alignment member (39) is pin-shaped, and the first position alignment groove (3113) and the second position alignment groove (3221) into which the position alignment member (39) is inserted are each shown as long grooves in the axial direction corresponding to the pin-shaped position alignment member.
[0113] However, in an alternative example not illustrated, the position alignment member (39) may be a plate-shaped member curved along the circumference of the scroll sidewall (322) or the frame sidewall (311), and the first position alignment groove (3113) and the second position alignment groove (3221) may also be formed to have a circumferential length equal to the circumferential length of the position alignment member (39).
[0114] Additionally, as described above, the first position alignment groove (3113) and the second position alignment groove (3221) are formed on the outer surface of the frame side wall (311) and the outer surface of the scroll side wall (322), and accordingly, the first position alignment groove (3113) and the second position alignment groove (3221) can be formed in a shape that is open radially outward. By doing so, the processing of the first position alignment groove (3113) and the second position alignment groove (3221) can be made easier, and the process of inserting the position alignment member (39) into the first position alignment groove (3113) and the second position alignment groove (3221) during the process of aligning and arranging the fixed scroll (32) on the frame (31) can be made easier.
[0115] However, if the position alignment member (39) can be positioned on the outer side of the sealing member (38), the first position alignment groove (3113) and the second position alignment groove (3221) into which the position alignment member (39) is inserted do not necessarily have to be formed on the outer surface of the frame side wall (311) and the outer surface of the scroll side wall (322).
[0116] Additionally, the first position alignment groove (3113) may be formed to be in communication with an adjacent portion of the sealing member receiving groove (3112) that accommodates the sealing member (38). By doing so, the thickness of the frame side wall portion (311) can be prevented from becoming unnecessarily thick due to the wall portion partitioning the space between the first position alignment groove (3113) and the sealing member receiving groove (3112).
[0117] In the process of fixing the previously described frame (31) and fixed scroll (32) between the support surface (112) of the cylindrical shell (11) and the support member (37), a positioning member (39) is inserted into the first positioning groove (3113) of the frame before attaching the fixed scroll (32) to the frame (31). Then, the circumferential position of the fixed scroll (32) is aligned so that the part of the positioning member (39) protruding outside the first positioning groove (3113) can be inserted into the second positioning groove (3221) of the fixed scroll (32), and the fixed scroll (32) is brought into close contact with the frame (31).
[0118] In this way, the first discharge passage (P G1 ) and the second discharge passage (P G2 The task of aligning the scroll side wall portion (322) of the fixed scroll (32) and the frame side wall portion (311) of the frame (31) so that they can communicate accurately without being misaligned can be easily performed.
[0119] A bottom-compressing scroll compressor according to one embodiment of the present invention as described above operates as follows.
[0120] When power is applied to the electric motor (20), rotational force is generated in the rotor (22) and the rotating shaft (50), causing them to rotate. As the rotating shaft (50) rotates, the swivel scroll (33), which is eccentrically coupled to the rotating shaft (50), rotates by means of the Oldham ring (35).
[0121] Then, the refrigerant supplied from the outside of the casing (10) through the refrigerant suction pipe (15) flows into the compression chamber (Vc), and as the volume of the compression chamber (Vc) decreases due to the rotational movement of the rotational scroll (33), the refrigerant is compressed and discharged into the internal space of the discharge cover (34) through the discharge port (325).
[0122] The refrigerant discharged into the internal space of the discharge cover (34) is discharged through the discharge passage (P G After moving through the frame (31) and the intermediate space (10c) between the motor unit (20), it moves through the gap between the inner surface of the stator (21) of the motor unit (20) and the outer surface of the rotor (22), and through the coil winding section, to the upper space (10a) of the motor unit (20). The refrigerant that has moved to the upper space (10a) of the motor unit (20) is discharged to the outside of the casing (10) through the refrigerant discharge pipe (16).
[0123] Additionally, the oil mixed with the refrigerant in the upper space (10a) of the electric motor (20) is separated from the refrigerant. The oil separated from the refrigerant is recovered through the oil passage (Po) to the lower space (10b), which is the oil storage space of the casing (10).
[0124] At this time, the oil in the lower space (10b) is sucked up through the oil supply passage (50a) of the rotating shaft (50), and then lubricates the main bearing part (51), the sub-bearing part (52), and the eccentric part (53) through the respective oil supply holes and oil supply grooves.
[0125] During the operation of the compressor, if the pressure in the compression chamber (Vc) having intermediate pressure becomes higher than the pressure in the intermediate pressure space (Sm), the refrigerant moves from the compression chamber (Vc) to the intermediate pressure space (Sm) through the intermediate pressure passage to form back pressure. Accordingly, the rotating tip plate (331) receives the back pressure of the intermediate pressure space (Sm) and is axially supported toward the fixed scroll (32), thereby preventing leakage between the compression chambers (Vc).
[0126] In the scroll compressor (1) according to one embodiment of the present invention as described above, the thickness of the frame side wall can be further reduced compared to the conventional method by combining the fixed scroll (32) and the frame (31) using a support member that supports the fixed scroll (32) axially toward the frame (31) from the lower side of the fixed scroll (32).
[0127] That is, conventionally, a fixing bolt penetrates the scroll side wall of a fixing scroll and is fastened to the frame side wall of a frame. Accordingly, in order to ensure that the fixing bolt can be fastened stably, the frame side wall requires a minimum thickness (D) between the outer surface in contact with the cylindrical shell and the inner surface on the opposite side (indicated by a dotted line in FIG. 8).
[0128] On the other hand, in the present invention, the fixed scroll and the frame are combined by using a support member (37) to support the fixed scroll axially with respect to the frame. By not directly fastening the fixed scroll to the frame in this way, the thickness (D′) between the outer surface that contacts the cylindrical shell of the frame side wall and the inner surface on the opposite side (indicated by a solid line in FIG. 8) can be further reduced compared to the conventional method.
[0129] By reducing the thickness of the frame sidewall from 'D' to 'D′', the space defined by the frame sidewall can be increased accordingly, and thus the stroke volume of the compression chamber formed between the rotating scroll and the fixed scroll engaged therewith, which are accommodated in the space defined by the frame sidewall, can also be increased.
[0130] Accordingly, it becomes possible to implement a scroll compressor that exhibits the same performance as conventional refrigerants by using a low-GWP refrigerant with a lower density than conventional refrigerants.
[0131] In addition, by reducing the thickness of the frame side wall portion (311) provided inside the casing (10), the stroke volume of the compression chamber can be increased without increasing the overall size of the scroll compressor (1), thereby suppressing the increase in manufacturing costs.
[0132] In addition, a discharge passage (P) that guides the refrigerant discharged from the compression chamber into the internal space of the casing (10). G By forming ) on the outer circumference side of the sealing member (38), the discharge passage (P G It is possible to prevent high-pressure refrigerant guided through the frame side wall (311) and scroll side wall (322) from leaking into the intermediate pressure space (Sm).
[0133] Meanwhile, in another embodiment of the scroll compressor (1) of the present invention, the discharge passage (P G ) can be formed between the fixed scroll (32) and the frame (31) and the cylindrical shell (11). FIGS. 9 and 10 show a discharge passage (P G Illustrates other examples of ).
[0134] The discharge passage (P) illustrated in FIGS. 9 and 10 G ) is a discharge passage (P) in the gap between the cylindrical shell (11), the fixed scroll (32), and the frame (31). G The point where ) is formed is the discharge passage (P) illustrated in FIGS. 2 and FIGS. 5. G It is different from ).
[0135] The discharge passage (P) of FIGS. 9 and 10 G ) is a first discharge passage (P) formed in a fixed scroll. G1 ), a second discharge passage (P) formed in the frame G2 ) and a third discharge passage (P) formed between the cylindrical shell (11), the fixed scroll (32), and the frame (31). G3 It may include ).
[0136] First discharge passage (P G1 ) is the internal space of the discharge cover (34) and the third discharge passage (P G3 It can be formed in a bent shape inside the scroll side wall portion (322) of the fixed scroll (32) to connect the )
[0137] Second discharge passage (P G2 ) is the interior of the Euro separation unit (40) and the third discharge passage (P G3It can be formed inside the frame side wall (311) of the frame (31) to connect the frame (31).
[0138] Third discharge passage (P G3 As shown in FIG. 10, it may be formed with a recessed portion (3222) formed along one side of the outer surface of the scroll side wall portion (322) of the fixed scroll (32) and the outer surface of the frame side wall portion (311) of the frame (31).
[0139] Preferably, a passage groove (113) may be provided, which is formed by protruding toward the outer surface of the cylindrical shell so as to correspond to a recess (3222) on the inner surface of the cylindrical shell (11). Accordingly, the third discharge passage (P G3 ) may be composed of a recess (3222) formed along the outer surface of the scroll side wall (322) and the outer surface of the frame side wall (311), and a passage groove (113) formed on the inner surface of the cylindrical shell (11).
[0140] In addition, FIG. 10 shows one discharge passage (P G ) is illustrated. However, as with the previous embodiment, the discharge passage (P G ) can be formed in multiple adjacent to each other along the circumference of the cylindrical shell (11).
[0141] In this case, the first discharge passage (P) formed on the lower surface of the scroll side wall (322) G1 The lower ends of the ) can be formed to be connected to each other to form a common inlet, and a second discharge passage (P) formed on the upper surface of the frame side wall (311) G2 The adjacent upper ends of ) can also be formed to be connected to each other to form a common discharge port.
[0142] In another embodiment of the scroll compressor (1) of the present invention, the support member (37) may be provided as part of another component of the compressor instead of being provided separately.
[0143] FIG. 11 is a cross-sectional view illustrating an example in which a support member (37) is provided as part of another component of the compressor.
[0144] Referring to FIG. 11, a lower cap (13) covering the lower part of the cylindrical shell (11) can perform the function of a support member (37).
[0145] That is, the upper end of the lower cap (13) extends axially upward and contacts the lower edge of the fixed scroll (32). The outer surface of the upper end of the lower cap (13) can be fixed to the inner surface of the lower end of the cylindrical shell (11) by welding.
[0146] In this configuration, a lower cap (13) that contacts the lower edge of the fixed scroll (32) and supports the fixed scroll (32) in the second axial direction in the cylindrical shell (11) may form a support member (37).
[0147] Accordingly, the support member (37) that supports the fixed scroll (32) in the axial direction may not be provided as a separate member, thereby reducing the number of components, simplifying the structure, and reducing manufacturing costs. Explanation of the symbols
[0148] 1: Scroll Compressor 10: Casing 10a: Upper space 10b: Lower space 10c: intermediate space 11: Cylindrical shell 112: Support surface 113: Passageway groove 12: Top cap 13: Bottom cap 20: Electric motor 21: Stator 22: Rotor 30: Compression section 31: Frame 311: Frame side wall 3112: Sealing member receiving groove 3113: 1st position alignment groove 32: Fixed scroll 321: Fixed plate section 322: Scroll sidewall 3221: Second position alignment home 3222: Depression 323: Fixed Lab 324: Intake 325: Discharge port 33: Swivel Scroll 331: Swivel plate section 332: Turning Rap 34: Discharge cover 35: Oldam Ring 37: Support absence 371: Supporting projection 39: Position alignment member 40: Euro Separation Unit 50: Rotation axis 50a: Oil supply route 53: Eccentric 60: Oil feeder 61: Oil supply pipe 62: Blocking member P G , P G1 , P G2 , P G3 : Discharge passage Po: Oil passage Vc: Compression chamber
Claims
Claim 1 A scroll compressor comprising: a casing; a drive unit inserted and fixed within the internal space of the casing; a frame provided on one side of the drive unit and supported in the casing in a first axial direction; a pivot scroll supported in the axial direction on the frame and performing pivoting motion; a fixed scroll supported on one side of the frame with the pivot scroll in between and forming a compression chamber together with the pivot scroll; and a support member that supports the fixed scroll in the casing in a second axial direction, wherein the support member is inserted and fixed within the inner circumference of the casing. Claim 2 In claim 1, the support member is formed in an annular shape and is a scroll compressor that is heat-shrunk to the inner circumference of the casing. Claim 3 In paragraph 2, the support member is a scroll compressor having an inner surface formed in the shape of a smooth tube. Claim 4 In paragraph 2, the support member is a scroll compressor having at least one support protrusion formed on its inner circumference. Claim 5 A scroll compressor according to claim 1, wherein the casing comprises a cylindrical shell into which the frame and the fixed scroll are inserted, and a cap covering the opening end of the cylindrical shell, and the support member comprises the cap inserted toward the fixed scroll at one opening end of the cylindrical shell. Claim 6 A scroll compressor according to claim 1, wherein a support surface is formed steppedly on the inner circumferential surface of the casing, and the frame is supported in a first axial direction with one side thereof in close contact with the support surface. Claim 7 A scroll compressor according to claim 6, wherein the radial thickness of the support member is formed to be greater than or equal to the radial width of the support surface portion. Claim 8 A scroll compressor according to claim 6, wherein the axial height of the support member is formed to be greater than or equal to the radial width of the support surface portion. Claim 9 A scroll compressor according to claim 1, wherein a first position alignment groove is formed on the outer surface of the frame, and a second position alignment groove is formed on the outer surface of the fixed scroll in a straight line along the axial direction with respect to the first position alignment groove, and a position alignment member inserted longitudinally between the first position alignment groove and the second position alignment groove is inserted into the first position alignment groove and the second position alignment groove. Claim 10 In any one of claims 1 to 9, a discharge passage is formed in the frame and the fixed scroll to guide the refrigerant discharged from the compression chamber into the internal space of the casing, and a sealing member is provided between the frame and the fixed scroll, and the sealing member is a scroll compressor provided on the inner circumference side of the discharge passage. Claim 11 In claim 10, a sealing member receiving groove is formed annularly on at least one of the frame and the fixed scroll facing it, and the sealing member is formed annularly and inserted into the sealing member receiving groove. Claim 12 In item 10, the discharge passage is a scroll compressor formed by penetrating the interior of the fixed scroll and the interior of the frame. Claim 13 In claim 10, the discharge passage is formed to be recessed into the outer surface of the fixed scroll and / or the outer surface of the frame, in a scroll compressor. Claim 14 A scroll compressor according to claim 13, wherein at least one passage groove is formed along the circumferential direction on the inner surface of the casing, and the passage groove is formed to protrude toward the outer surface of the casing so as to correspond to the discharge passage.