Compressor

Abstract

Disclosed is a compressor. The compressor comprises: a housing; a driving unit which is provided inside the housing to generate power, and includes a stator, a rotor, and a shaft having a bore formed therein; a rolling piston into which the shaft is inserted and which rotates by receiving power from the driving unit; a compression unit including a cylinder in which a compression chamber for compressing a refrigerant is provided; and a shock absorber provided on an upper portion of the driving unit to reduce vibration of the shaft. The shock absorber includes: a body coupled to the inside of the housing; and a bearing part formed on the lower surface of the body so as to rotatably support the upper portion of the shaft, wherein oil in the bore is guided between one surface of the bearing part and one surface of the shaft to an upper space of the driving unit.

Description

compressor

[0001] The present invention relates to a compressor used in an air conditioner or the like.

[0002] A compressor is a mechanical device that receives power from a power-generating device, such as an electric motor or turbine, to compress air, refrigerant, or other working gases, thereby increasing their pressure. Compressors are widely used in home appliances such as refrigerators, air conditioners, and clothes dryers, as well as across various industries.

[0003] There are various types of compressors, including reciprocating compressors, scroll compressors, and rotary compressors. A reciprocating compressor compresses the working gas by forming a compression space between the piston and the cylinder, where the working gas is sucked in and discharged, and the piston moves back and forth in a straight line inside the cylinder. A scroll compressor compresses the working gas by forming a compression space between an orbiting scroll and a fixed scroll, where the working gas is sucked in and discharged, and the orbiting scroll rotates along the fixed scroll. A rotary compressor compresses the working gas by forming a compression space between an eccentrically rotating rolling piston and the cylinder, where the working gas is sucked in and discharged, and the rolling piston rotates eccentrically along the inner wall of the cylinder.

[0004] The compressor includes a compression unit in which refrigerant compression is performed and a drive unit that provides power for compressing the refrigerant. A shock absorber may be provided inside the housing to reduce vibration of the compressor.

[0005] One aspect of the present invention provides a compressor including a buffer so that radial vibration of a rotating shaft of the compressor can be reduced.

[0006] One aspect of the present invention provides a compressor including a bearing structure so that an upper portion of a shaft of the compressor can be supported.

[0007] One aspect of the present invention provides a lubricating means for supplying lubricating oil to a bearing provided at the top of a shaft of a compressor.

[0008] The technical problems to be achieved in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0009] A compressor according to the invention comprises a housing, a drive unit provided inside the housing to generate power and including a stator, a rotor, and a hollow shaft, a rolling piston into which the shaft is inserted and which rotates by receiving power from the drive unit, a compression unit including a cylinder having a compression chamber for compressing refrigerant, and a shock absorber provided on the upper portion of the drive unit to reduce vibration of the shaft.

[0010] The above-mentioned buffer includes a body coupled to the inside of the housing, and a bearing part formed on the lower surface of the body to rotatably support the upper portion of the shaft, and the hollow oil is guided to the upper space of the driving part through a space between one surface of the bearing part and one surface of the shaft.

[0011] A compressor according to the invention comprises a driving unit that is provided inside the housing to generate power and includes a stator, a rotor, and a shaft having a hollow space therein, a compression unit that includes a rolling piston into which the shaft is inserted and that rotates by receiving power from the driving unit, and a cylinder having a compression chamber that compresses refrigerant, and a shock absorber that is coupled inside the housing and includes a bearing unit that is inserted into the hollow space of the shaft to control the supply of oil to the upper portion of the driving unit through the hollow space of the shaft and rotatably supports the upper end of the shaft.

[0012] FIG. 1 is an axial cross-sectional view of a compressor according to one embodiment of the present invention.

[0013] FIG. 2 is a drawing for explaining the flow of oil in a compressor according to one embodiment of the present invention.

[0014] FIG. 3 is a drawing for explaining the flow of refrigerant gas in a compressor according to one embodiment of the present invention.

[0015] Figure 4 is a perspective view of a buffer shape according to one embodiment of the present invention.

[0016] Figure 5 is a perspective view of a buffer shape according to one embodiment of the present invention.

[0017] Figure 6 is a perspective view of a buffer shape according to one embodiment of the present invention.

[0018] FIG. 7 is a side cross-sectional view of the buffer of FIG. 1 in a compressor according to one embodiment of the present invention.

[0019] FIG. 8 is a side cross-sectional view showing a filter provided inside a hole of a buffer according to one embodiment of the present invention.

[0020] FIG. 9 is a side cross-sectional view showing a filter provided on the lower surface of a buffer according to one embodiment of the present invention.

[0021] FIG. 10 is an enlarged view of a position corresponding to B of FIG. 7 in one embodiment of the present invention.

[0022] FIG. 11 is an enlarged view of a position corresponding to B of FIG. 7 in one embodiment of the present invention.

[0023] Fig. 12 is a side cross-sectional view illustrating the shape of the edge of a buffer according to one embodiment.

[0024] Fig. 13 is a side cross-sectional view illustrating the shape of the edge of a buffer according to one embodiment.

[0025] Fig. 14 is a side cross-sectional view illustrating the shape of the edge of a buffer according to one embodiment.

[0026] FIG. 15 is an enlarged view of a position corresponding to A of FIG. 1 in a compressor according to one embodiment of the present invention.

[0027] FIG. 16 is an enlarged view of a position corresponding to A of FIG. 1 in a compressor according to one embodiment of the present invention.

[0028] Fig. 17 is a side cross-sectional view showing the shape of a buffer bearing part of a compressor and the flow of oil according to one embodiment of the present invention.

[0029] Fig. 18 is a side cross-sectional view showing the shape of a buffer bearing part of a compressor and the flow of oil according to one embodiment of the present invention.

[0030] Fig. 19 is a side cross-sectional view showing the shape of a buffer bearing part of a compressor and the flow of oil according to one embodiment of the present invention.

[0031] FIG. 20 is a side cross-sectional view illustrating a state of controlling oil supply through a buffer bearing section of a compressor according to one embodiment of the present invention.

[0032] FIG. 21 is a side cross-sectional view illustrating a method for controlling oil supply through a buffer bearing section of a compressor according to one embodiment of the present invention.

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

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

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

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

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

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

[0039] The terms "include" or "have" are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in this document, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0040] When a component is said to be “connected,” “coupled,” “supported,” or “in contact with” another component, this includes not only cases where the components are directly connected, coupled, supported, or in contact, but also cases where the components are indirectly connected, coupled, supported, or in contact through a third component.

[0041] When we say that a component is "on" another component, this includes not only cases where the component is in contact with the other component, but also cases where there is another component between the two components.

[0042] The terms “upper side,” “lower side,” “horizontal direction,” etc. used in the description below are defined based on the drawing, and the shape and position of each component are not limited by these terms.

[0043] Among the expressions used in the description below, “upper~”, “lower~”, etc. can be used to distinguish components by considering the relative positions between the components, and these expressions can be replaced with expressions such as “first~”, “second~”.

[0044] Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings.

[0045] FIG. 1 is an axial cross-sectional view of a compressor according to one embodiment of the present invention.

[0046] Referring to FIG. 1, a compressor (1) according to one embodiment of the present disclosure may include a compression unit (20) configured to compress a refrigerant, a drive unit (30) provided to provide power to the compression unit (20), and a housing (10) that accommodates the compression unit (20) and the drive unit (30).

[0047] The housing (10) can form the exterior of the compressor (1). An accommodation space in which a compression unit (20) and a driving unit (30) are accommodated can be formed inside the housing (10). Oil can be stored in the inner lower part of the housing (10) to reduce friction between various components of the compressor (1) and to cool the components.

[0048] The housing (10) can be connected to the accumulator (2) via the compressor inlet pipe (4). The refrigerant in the accumulator (2) can be introduced into the compression chamber (22) in the cylinder (21) via the cylinder inlet pipe (4).

[0049] A compressor discharge pipe (5) may be connected to the discharge portion (3) side of the housing (10). The compressor discharge pipe (5) may be provided to guide the refrigerant compressed within the housing (10) to be discharged outside the housing (10).

[0050] The driving unit (30) can convert electromagnetic force into mechanical rotational force. The driving unit (30) can include a stator (31) fixed to the housing (10) and a rotor (32) having magnetism and capable of rotating relative to the stator (31) by electromagnetic force.

[0051] The compressor (1) may include a shaft (40) that is provided to transmit power generated from the driving unit (30) to the compression unit (20). The shaft (40) may be fixed to the rotor (32) and provided to rotate together with the rotor (32).

[0052] The shaft (40) may include a hollow portion (45). Oil may be supplied from an opening (43) at the bottom of the shaft (40) to the upper portion of the shaft (40) through the hollow portion (45).

[0053] The compression unit (20) may include a cylinder (21) including a compression chamber (22). The compression chamber (22) may be provided inside the cylinder (21). The compression unit (20) may include a rolling piston (23) that is provided to be rotatable inside the cylinder (21). The rolling piston (23) may be provided to compress the refrigerant in the compression chamber (22) as it rotates inside the cylinder (21). The rolling piston (23) may be provided to rotate by receiving power from a shaft (40).

[0054] A plurality of cylinders (21) of the compression unit (20) may be provided, and may be arranged spaced apart from each other along the direction of the rotation axis (47). The cylinders (21) may include an upper cylinder and a lower cylinder, and a mid plate (26) may be provided between the upper cylinder and the lower cylinder to partition the upper cylinder and the lower cylinder.

[0055] A buffer (100) may be provided on the upper portion of the driving portion (30). The buffer (100) may include a body (110), a bearing portion (120), a rim portion (130), and a hole (140). The buffer (100) may be placed on the upper portion of the housing (10). The buffer (100) may be coupled to the inside of the housing (10). The rim portion (130) of the buffer (100) may be press-fitted into the inner surface of the housing (10).

[0056] A bearing part (120) may be provided on the lower surface (111) of the buffer (100). The bearing part (120) may include a contact protrusion (121) formed by protruding from the lower surface (111) of the buffer (100). The contact protrusion (121) of the bearing part (120) may contact the shaft (40) to rotatably support the shaft (40). The contact protrusion (121) of the bearing part (120) may be inserted into the hollow (45) at the upper end of the shaft (40).

[0057] A contact end (122) may be formed at the end of the bearing portion (120). The surface of the contact end (122) may be tapered in a direction that becomes closer to the rotation axis (47) as it goes downward. The surface of the contact end (122) may be in contact with the inner upper end of the shaft (40). The inner surface (42) of the upper end of the shaft (40) may be tapered at a predetermined angle to correspond to the surface of the contact end (122). A support surface (44) may be formed at the upper end of the inner side of the shaft (40) at a position corresponding to the outer surface of the contact end (122) that supports the shaft.

[0058] The gap formed between the bearing surface (44) on the upper side of the shaft (40) and the outer surface of the contact end (122) may be formed to be approximately several tens of micrometers. A gap of approximately several tens of micrometers may be formed on the bearing surface (44). Oil may be positioned in the gap formed on the bearing surface (44). A lubricating film may be formed between the contact end (122) and the bearing surface (44).

[0059] A lubricating passage (not shown) may be formed on the upper portion of the shaft (40). The lubricating passage (not shown) may refer to a gap formed between the bearing portion (120) and the upper portion of the shaft (40). The lubricating passage (not shown) may have a passage area of ​​approximately several micrometers to several tens of micrometers. The lubricating passage (not shown) may refer to a lubricating film formed on the bearing surface (44).

[0060] The lubricating film may be formed by oil passing through the lubricating passage (not shown), and the lubricating film may refer to oil located inside the lubricating passage (not shown). Friction between the bearing portion (120) and the upper end of the shaft (40) may be reduced by the lubricating film.

[0061] The bearing part (120) can control the amount of oil flowing through a gap formed on the bearing surface (44). The gap formed on the bearing surface (44) can widen or narrow due to wear of the contact end (122) and the upper end of the shaft (40).

[0062] A hole (140) may be provided on the periphery of the upper surface (112) of the body (110) of the buffer (100) for the compressed refrigerant gas to pass through. The hole (140) may be formed to penetrate the upper surface (112) in a direction parallel to the rotation axis (47). A plurality of holes (140) may be formed.

[0063] A filter (150) capable of filtering vaporized oil may be provided on the upper surface (112) of the body (110).

[0064] FIG. 2 is a drawing illustrating the flow of oil in a compressor according to one embodiment of the present invention. Referring to FIG. 2, oil that acts as a lubricant to reduce friction between rotating members of the compressor can be stored in the inner lower part of the housing.

[0065] A hollow (45) may be formed in the shaft (40) that penetrates the upper and lower parts of the shaft (40). The hollow (45) may be formed to have a predetermined diameter centered on the rotation axis (47) of the shaft (40). Through the hollow (45), oil stored in the lower part of the housing (10) may pass through the shaft (40) and move to the upper space of the driving unit (30).

[0066] An opening (43) may be provided at the lower end of the shaft (40) to communicate with the hollow (45) so that oil can flow into the hollow. The opening (43) may be provided to penetrate the compression unit (20). Oil stored in the lower portion of the housing (10) can flow into the hollow (45) through the opening (43).

[0067] A pump (46) may be provided at the lower portion of the shaft (40) to guide the movement of oil. The pump (46) may be provided inside the hollow (45) and positioned directly above the opening (43). The pump (46) may be provided in a roughly screw-like shape.

[0068] The pump (46) may be fixed to the inside of the shaft (40) and arranged to rotate along with the rotation of the shaft (40). As the pump (46) rotates, oil introduced through the opening (43) may move to the upper part of the shaft (40). Oil introduced to the lower part of the shaft (40) may rise along the slope of the rotating pump (46).

[0069] The compressor (1) can supply lubricating oil to the bearing part (120) through the hollow part (45). The supplied lubricating oil can be guided to the outside of the shaft (40) through the lubricating film located on the bearing surface (44). The outside of the shaft (40) can mean the space above the driving part (30), which is provided between the buffer (100) and the driving part (30).

[0070] The amount of oil flowing can be controlled through a fuel line (not shown). The pressure of the oil passing through the fuel line (not shown) can be reduced.

[0071] Oil moved through the hollow (45) can be supplied to the bearing part (120) through an oil supply path (not shown). The oil can be guided to the outside of the shaft (40) through the oil supply path (not shown).

[0072] Oil discharged to the outside of the shaft (40) through the oil supply path (not shown) can be guided to the lower side of the housing (10). The oil can descend by gravity. The oil can move along the inner wall surface of the housing (10) or through a space provided between the components of the driving unit (30). For example, the stator (31) and rotor (32) of the driving unit (30) can be provided to be spaced apart so as to have an air layer of approximately several tens of micrometers between them.

[0073] Oil guided to the lower side of the housing (10) may be included in the oil stored in the lower side of the housing (10). Oil discharged through the oil supply passage (not shown) at the top of the shaft (40) may be stored again in the lower side of the housing (10). Oil supplied to the lubricating film may be stored again in the lower side of the housing (10). Oil in the lower side of the housing (10) may be guided to reach the lower side of the housing (10) again through the hollow (45) and the oil supply passage (not shown). An oil circulation system may be provided inside the housing (10).

[0074] FIG. 3 is a drawing for explaining the flow of refrigerant gas in a compressor according to one embodiment of the present invention. Referring to FIG. 3, a compression unit (20) may include a cylinder (21), a compression chamber (22), a rolling piston (23), a suction chamber (24) connected to an inlet pipe (4) into which refrigerant is introduced, and a vane (not shown) separating the suction chamber (24) and the compression chamber (22).

[0075] The refrigerant gas can be compressed in the compression chamber (22) and discharged outside the compression unit (20). The refrigerant gas can rise, pass through the drive unit (30) and the buffer (100), and exit the housing (10) through the compressor discharge pipe (5) at the top of the housing (10).

[0076] The refrigerant gas can rise through the space provided between the components of the driving unit (30). The refrigerant gas can pass through the hole (140) provided in the body (110) of the buffer (100). The refrigerant gas can pass through the filter (150) provided to block the hole (140) and move to the compressor discharge portion (3) at the top of the housing (10). The refrigerant gas can exit the housing (10) through the compressor discharge pipe (5).

[0077] Fig. 4 is a perspective view of a buffer shape according to one embodiment of the present invention. Referring to Fig. 4, the buffer (100) may include a body (110) that is provided to be fixed to the inside of a housing (10), a bearing portion (120) provided in the center of a lower surface (111) of the body (110), a border portion (130) formed along an outer surface of the body (110), and a hole (140) formed by penetrating the upper surface (112) of the body (110) in a direction perpendicular to the radial direction of the body (110).

[0078] The body (110) of the buffer (100) may be provided in a shape roughly like a circular plate. The body (110) may include a lower surface (111) on which a bearing portion (120) is formed and an upper surface (112) facing the discharge portion (3). A bearing portion (120) may be provided at the center of the lower surface (111). The bearing portion (120) may be provided in a shape such that the shaft (40) does not penetrate the upper surface (112) of the buffer (100).

[0079] A bearing portion (120) may be formed on the lower surface (111) of the body (110). The bearing portion (120) may include a contact projection (121) that protrudes from the lower surface (111). The contact projection (121) may include a body (123) that protrudes from the lower surface (111) and a contact end (122) that supports the upper end of the shaft (40) at the end of the body (123). The body (123) may be provided in a shape of an approximately cylinder. The contact end (122) may be provided to taper toward the central axis (48) at a predetermined angle as it goes toward the end of the body (123). The contact end (122) may be provided in a shape of an approximately cone. The tapered surface of the contact end (122) may be accommodated to contact the upper end of the shaft (40). The outer surface of the contact end (122) and the support surface (44) may be one surface of a fuel supply path (not shown).

[0080] A border portion (130) may be provided on the side of the body (110). The border portion (130) may be formed to extend in the direction in which the lower surface (111) faces. The border portion (130) may include an outer surface (131) supported on the inside of the housing (10) and an inner surface (132) formed vertically from the lower surface (111) of the body. However, the direction in which the border portion (130) faces is not limited to the present embodiment.

[0081] A hole (140) may be provided on the upper surface (112) of the body (110) to allow refrigerant gas to pass therethrough. The hole (140) may be formed to vertically penetrate the upper surface (112) and the lower surface (111). The hole (140) may be provided on the periphery of the central axis (48) of the body (110). A plurality of holes (140) may be provided, and the sum of the areas of the plurality of holes (140) may be approximately similar to the area of ​​the upper surface (112) excluding the hole (140). The hole (140) may be formed on the inner side of a curve of a closed orbit formed on the upper surface (112) of the body (110). The hole (140) may be formed to have an approximately curved border. However, this is only one example, and the shape of the hole (140) is not limited thereto.

[0082] FIG. 5 is a perspective view of a buffer shape according to one embodiment of the present invention.

[0083] In the following description, for convenience of explanation, configurations that are substantially the same or similar to those described with reference to FIG. 4 may be omitted or briefly described.

[0084] Referring to FIG. 5, the buffer (200) may include a body (210), a bearing portion (120), a frame portion (130), and a hole (240). The bearing portion (120) and the frame portion (130) may be substantially the same as or similar to the bearing portion (120) and the frame portion (130) described with reference to FIG. 4. The hole (240) formed on the upper surface (surface 212) of the body (210) may be somewhat different from the hole (140) described with reference to FIG. 4.

[0085] A hole (240) may be formed on the upper surface (212) of the body (210) to provide a flow path for refrigerant gas. The hole (240) may be formed to extend along a predetermined orbit formed on the upper surface (212) of the body (210). In this case, the hole (240) may be formed to extend along a curved or straight orbit. The hole (240) may be formed to have a width in a direction perpendicular to the curved or straight orbit.

[0086] For example, the orbit on the upper surface (212) of the body (210) may have a curved shape that starts from the edge (130) of the body (210) and continues to the center of the body (210). A plurality of such orbits may be provided. The orbit on the upper surface (212) of the body (210) may be provided to have a roughly spiral orbit as a whole. The hole (240) may be formed to extend along the orbit above. At this time, the width of the extended hole (240) may be formed to become smaller as it approaches the central axis (48) of the body (210). The size of the hole (240) may become smaller as it approaches the central axis (48) of the body (210).

[0087] The hole (240) formed on the upper surface (212) of the body (210) may be used for purposes other than as a passage for refrigerant gas, depending on its size and shape. The body (210) may be provided to behave approximately like a plate spring by virtue of the hole (240) formed on the upper surface (212) of the body (210). The body (210) may be provided in the shape of a plate spring by virtue of the hole (240).

[0088] When the buffer (200) including the body (210) in the shape of a plate spring is press-fitted into the inside of the housing (10), the buffer (200) can be further pressed in even after the bearing portion (120) comes into contact with the shaft (40). The rim portion (130) of the buffer (200) can be further moved in the direction of the central axis (48) even after the bearing portion (120) is supported on the shaft (40). The body (210) of the additionally press-fit buffer (200) can apply a preload to the bearing portion (120) supported by the shaft (40) in the direction of the rotation axis (47). Since the bearing portion (120) is preloaded, the gap can be maintained for a long time. Since the bearing portion (120) is preloaded, the ability to control the oil discharge amount can be maintained for a long time.

[0089] Figure 6 is a perspective view of a buffer shape according to one embodiment of the present invention.

[0090] In the following description, for convenience of explanation, configurations that are substantially the same or similar to those described with reference to FIG. 4 may be omitted or briefly described.

[0091] Referring to FIG. 6, the buffer (300) may include a body (110), a bearing portion (320), a frame portion (130), and a hole (140). The body (110), the frame portion (130), and the hole (140) may be substantially the same as or similar to the body (110), the frame portion (130), and the hole (140) described with reference to FIG. 4. The bearing portion (320) formed on the lower surface (111) of the body (110) may be somewhat different from the bearing portion (120) described with reference to FIG. 4.

[0092] A bearing part (320) may be formed on the lower surface (111) of the body (110). The bearing part (320) may include a body (323) that protrudes in the direction that the lower surface (111) faces, and a contact end (322) that is supported by the upper end of the shaft (40) at the end of the protruding body (323). The body (323) may be provided between the lower surface (111) and the contact end (322). The body (323) may be provided in an approximately cylindrical shape. The diameter of the cross-section of the body (323) may be provided to be smaller than the diameter of the cross-section of the contact end (322). When the contact end (322) has an approximately conical shape, the diameter of the cross-section of the body (323) may be formed to be smaller than the maximum diameter of the cross-section of the contact end (322). The shape of the cross-section in the direction of the central axis (48) of the contact projection (321) may be a shape formed such that the cross-section corresponding to the body (323) is sunken toward the central axis (48) with respect to the cross-section of the contact end (322).

[0093] The body (323) of the contact projection (321) may be made of the same material as the buffer (300). For example, the body (323) may be made of a metal material. The central axis of the body (323), the central axis (48) of the buffer (300), and the central axis of the contact end (322) may be aligned. However, the central axis of the bearing portion (320) may not be aligned with the central axis (47) of the shaft (40) due to an error that occurred during the process. At this time, when the contact end (322) of the bearing portion (320) is accommodated at the upper end of the shaft (40), the central axis of the body (323) may be arranged to be inclined with respect to the rotation axis (47) of the shaft (40). Accordingly, the central axis of the contact end (322) may be arranged to be aligned with the rotation axis (47). An automatic alignment function can be provided in which the center axis of the contact end (322) is automatically aligned with the rotation axis (47) by the shape of the body (323) of the bearing part (320).

[0094] FIG. 7 is a side cross-sectional view of the buffer of FIG. 1 in a compressor according to one embodiment of the present invention.

[0095] FIG. 8 is a side cross-sectional view showing a filter provided inside a hole of a buffer according to one embodiment of the present invention.

[0096] FIG. 9 is a side cross-sectional view showing a filter provided on the lower surface of a buffer according to one embodiment of the present invention.

[0097] In the following description, for convenience of explanation, configurations that are substantially the same or similar to those described with reference to FIG. 4 may be omitted or briefly described.

[0098] Referring to FIGS. 7 to 9, the buffer (100) may include a body (110), a bearing portion (120), a frame portion (130), and a hole (140). The body (110), the bearing portion (120), the frame portion (130), and the hole (140) may be substantially the same as or similar to the body (110), the bearing portion (120), the frame portion (130), and the hole (140) described with reference to FIG. 4.

[0099] The buffer (100) may be provided with a filter (150) through which vaporized oil can be filtered.

[0100] The filter (150) may be provided to block the hole (140). The filter (150) may include a mesh filter (151) made of a metal material. The mesh size of the mesh filter (151) may be approximately several micrometers. The filter (150) may include an oil-repellent coating film (152) formed by applying an oil-repellent coating on the mesh filter. Alternatively, the filter (150) may include either the mesh filter (151) or the oil-repellent coating film (152).

[0101] The filter (150a) may be provided on the upper surface (112) of the body (110). The filter (150a) may be provided to have the same shape as the upper surface (112) of the buffer (100). However, the present invention is not limited to this embodiment, and the filters (150b; 150c) may be provided between the upper surface (112) and the lower surface (111) of the body (110) or on the lower surface (111) of the body (110).

[0102] The buffer (100) may be formed as a single body, but may be provided to be separated and joined into an upper part including an upper surface (112) and a lower part including a lower surface (111), and the upper part and the lower part may be joined in the direction of the central axis (48).

[0103] The filter (150b) can be installed during the manufacturing process of the buffer (100). The filter (150b) can be provided between the upper and lower components during the joining process of the buffer (100) composed of the upper and lower components. The filter (150b) can be provided at approximately the midpoint between the upper surface (112) and the lower surface (111) of the buffer (100). The filter (150b) can block the hole (140) from the inside of the hole (140). However, the method by which the filter (150b) is provided on the inside of the hole (140) of the buffer (100) is not limited thereto. For example, the filter (150b) can be provided in approximately the same shape as the hole (140) of the buffer (100), and can be provided by being press-fitted or welded on the inside of the hole (140).

[0104] The filter (150c) provided on the lower surface (111) of the buffer (100) may be provided to have the same shape as the lower surface (111) of the buffer (100). The filter (150c) may have a hole provided in the center. The bearing part (120) may protrude through the hole in the center of the filter (150c). The filter (150c) may be provided to block the lower surface (111) of the body (110) excluding the bearing part (120). However, the present invention is not limited to this embodiment, and the filter (150c) may be provided to block the hole (140) in the lower surface (111) in various shapes capable of blocking the hole (140).

[0105] FIG. 10 is an enlarged view of a position corresponding to B of FIG. 7 in one embodiment of the present invention.

[0106] FIG. 11 is an enlarged view of a position corresponding to B of FIG. 7 in one embodiment of the present invention.

[0107] In the following description, for convenience of explanation, configurations that are substantially the same or similar to those described with reference to FIGS. 1 and 4 may be omitted or briefly described.

[0108] Referring to FIGS. 10 and 11, the buffer (100) may include a body (110), a bearing portion (120), a frame portion (130), and a hole (140). The body (110), the bearing portion (120), and the hole (140) may be substantially the same as or similar to the body (110), the bearing portion (120), the frame portion (130), and the hole (140) described with reference to FIGS. 1 and 4.

[0109] The rim portion (130) of the buffer (100) may include an outer surface (131) that is provided to be supported on the inner surface of the housing (10). The buffer (100) may be accommodated inside the housing (10). The buffer (100) may be press-fitted into the inner surface of the housing (10). The outer surface (131) of the rim portion (130) may roughly correspond to the inner surface of the housing (10). The outer surface (131) of the rim portion (130) may be fitted into the inner surface of the housing (10).

[0110] The outer surface (131) of the rim portion (130) may be provided parallel to the direction of the central axis (48). The outer surface (131) may be formed to be bent toward the central axis (48) as it goes downwards of the buffer (100). The outer diameter of the rim portion (130) may be formed to become smaller as it goes downwards. The corners on both sides of the cross-section of the buffer (100) in the direction of the central axis (48) may be formed in a shape in which they converge toward the central axis (48) as they go downwards.

[0111] The outer surface (131) may be formed to be bent from approximately the middle position between the upper surface (134) and the lower surface (133) of the edge portion (130) toward the lower side. The bent surface (135) formed at the lower part of the outer surface (131) may be bent to have an approximately curved shape or may be formed to taper at a predetermined angle. In the cross-section toward the central axis (48) of the buffer, the bent surface (135) formed at the lower part of the outer surface (131) may be provided in a shape that is rounded in a curve or chamfered in a straight line.

[0112] Fig. 12 is a side cross-sectional view illustrating the shape of the edge of a buffer according to one embodiment.

[0113] Fig. 13 is a side cross-sectional view illustrating the shape of the edge of a buffer according to one embodiment.

[0114] Fig. 14 is a side cross-sectional view illustrating the shape of the edge of a buffer according to one embodiment.

[0115] In the following description, for convenience of explanation, configurations that are substantially the same or similar to those described with reference to FIG. 1 may be omitted or briefly described.

[0116] Referring to FIGS. 12 to 14, the buffer may include a body (110), a bearing portion (120), a frame portion (130), and a hole (140). The body (110), the bearing portion (120), the frame portion (130), and the hole (140) may be substantially the same as or similar to the body (110), the bearing portion (120), the frame portion (130), and the hole (140) described with reference to FIG. 1.

[0117] The edge portion (130) of the body (110) may be formed to surround the body (110) in a roughly outer wall shape along the side of the body (110). The edge portion (130) may be formed to protrude in a direction parallel to the central axis (48) from one side of the body (110). For example, the edge portion (130) may be formed to protrude downward from the outer diameter portion of the lower surface (111) of the body (110). At this time, the edge portion (130) may include an outer surface (131), an inner surface (132), a lower surface (133), and a folded surface (135). Alternatively, the edge portion (130) may be formed to protrude upward from the outer diameter portion of the upper surface (112) of the body (110). At this time, the border (130) may include an outer surface (131), an inner surface (132), an upper surface (134), and a folded surface (135).

[0118] However, it is not limited to the above embodiment, and the border portion (130) may be formed by protruding both upwardly and downwardly from the outer diameter of the body (110). At this time, the border portion (130) may include an outer surface (131), an inner surface (132), an upper surface (134), a lower surface (133), and a folded surface (135), and the inner surface (132) may be divided into an upper inner surface and a lower inner surface by the body (110).

[0119] However, the shape of the buffer (100) is not limited to the above embodiment, and the buffer (100) may not include a border (130). In this case, an outer surface (131) supported by the inner side of the housing (10) may be formed on the side of the body (110).

[0120] FIG. 15 is an enlarged view of a position corresponding to A of FIG. 1 in a compressor according to one embodiment of the present invention.

[0121] FIG. 16 is an enlarged view of a position corresponding to A of FIG. 1 in a compressor according to one embodiment of the present invention.

[0122] In the following description, for convenience of explanation, configurations that are substantially the same or similar to those described with reference to FIG. 1 may be omitted or briefly described.

[0123] Referring to FIGS. 15 and 16, the compressor (1) may include a housing (10), a driving unit (30), a compression unit (20), and a buffer (100). The compression unit (20) and the buffer (100) may be substantially the same as or similar to the compression unit (20) and the buffer (100) described with reference to FIG. 1. With respect to the configuration of the compressor (1) of FIG. 1, the compressor (1) may further include a stopper (19, 39) structure so that the pressing position of the buffer (100) can be adjusted.

[0124] Referring to Fig. 15, a stopper (19) may be formed on the inner surface of the housing (10) so that the amount of pressing of the buffer (100) can be adjusted. The stopper (19) provided on the housing (10) may include a step portion (19) formed on the inner surface of the housing (10) so as to protrude toward the rotation axis (47). The lower part of the edge portion (130) of the buffer (100) may be supported by the step portion (19) formed on the inner surface of the housing (10), so that the pressing of the buffer (100) in the direction of the rotation axis (47) may be limited. The step portion (19) may be provided so as to support the folded surface (135) of the edge portion (130). The step portion (19) can be provided at a position that limits the pressing in the direction of the central axis (48) of the buffer (100) at a position where the bearing portion (120) of the buffer (100) contacts the upper end of the shaft (40).

[0125] Referring to Fig. 16, a stopper (39) may be formed on the upper portion of the driving unit (30) to limit the pressing of the buffer (100). The stopper (39) may be provided as a limiting projection (39) that protrudes from the upper surface of the driving unit (30) in the direction of the rotation axis (47). A plurality of limiting projections (39) may be provided, and the plurality of limiting projections (39) may be arranged to surround the shaft (40) at the periphery of the shaft (40). The limiting projection (39) may be provided to support the lower surface (111) of the buffer (100). The limiting projection (39) may be provided to protrude so as to support the lower surface (111) of the buffer (100) at a position where the bearing portion (120) of the buffer (100) contacts the upper end of the shaft (40).

[0126] The structure of the stopper (19, 39) is not limited to the above embodiment, but may be provided in various structures that can support the buffer (100) and limit the pressing in the direction of the central axis (48) of the buffer (100). The compressor (1) may selectively include the stopper (19, 39). The compressor (1) may include a plurality of stoppers (19, 39). The compressor (1) may not include the stopper (19, 39).

[0127] Fig. 17 is a side cross-sectional view showing the shape of a buffer bearing part of a compressor and the flow of oil according to one embodiment of the present invention.

[0128] Fig. 18 is a side cross-sectional view showing the shape of a buffer bearing part of a compressor and the flow of oil according to one embodiment of the present invention.

[0129] Fig. 19 is a side cross-sectional view showing the shape of a buffer bearing part of a compressor and the flow of oil according to one embodiment of the present invention.

[0130] In the following description, for convenience of explanation, configurations that are substantially the same or similar to those described with reference to FIG. 1 may be omitted or briefly described.

[0131] Referring to FIGS. 17 to 19, the compressor (1) may include a housing (10), a driving unit (30), a compression unit (20), and a buffer (400; 500; 600). The housing (10), the driving unit (30), the compression unit (20), and the buffer (400; 500; 600) may be substantially the same as or similar to the housing (10), the driving unit (30), the compression unit (20), and the buffer (100) described with reference to FIG. 1. The buffer (400; 500; 600) may include a body (110), a bearing unit (420; 520; 620), a rim (130), and a hole (140). The body (110), the rim (130), and the hole (140) may be substantially the same as or similar to the body (110), the rim (130), and the hole (140) described with reference to FIG. 1. The bearing parts (420; 520; 620) of the buffer (400; 500; 600) may be slightly different.

[0132] Referring to FIGS. 17 to 19, a bearing part (420; 520; 620) may be provided on the lower surface (111) of the body (110) of the buffer (400; 500; 600).

[0133] The bearing portion (420; 520; 620) may be provided to rotatably support the upper portion of the shaft (40).

[0134] According to one embodiment, the bearing portion (420) of the buffer (400) may be provided to protrude from the lower surface (111) of the body (110) and be accommodated in the shaft (40) to support the inner surface (42) of the shaft (40). The bearing portion (420) may include a contact protrusion (421) formed to protrude downward from the lower surface (111), and the contact protrusion (421) may include a body (423) and a contact end (422) at an end of the body (423) that is supported by the inner surface (42) of the shaft (40). The body (423) and the contact end (422) may be provided in an approximately cylindrical shape. The diameter of the cross-section of the body (423) may be provided to be smaller than the diameter of the cross-section of the contact end (422). The contact end (422) may be completely accommodated in the hollow (45). The body (423) can be partially accommodated in the hollow (45). The support surface (44) of the shaft (40) supported by the contact end (422) can be formed on the inner surface (42) of the upper end of the shaft (40). The support surface (44) can be formed on the inner surface (42) of the shaft. At this time, the lubricant can be guided to pass through the oil supply path (not shown) upward in a direction parallel to the rotation axis (47) along the support surface (44) and be discharged to the outside of the shaft (40).

[0135] However, the shape of the bearing part (520) is not limited to the above embodiment. The bearing part (520) protruding from the lower surface (111) of the body (110) may be provided to accommodate the upper portion of the shaft (40) and support the outer surface (41) of the upper portion of the shaft (40). The bearing part (520) may include a contact protrusion (521) formed to protrude downward from the lower surface (111), and the contact protrusion (521) may include a body (523) and a contact end (522) at the end of the body (523) that supports the outer surface (41) of the shaft (40). The body (523) and the contact end (522) may be provided in the shape of a roughly hollow cylinder. The body (523) and the contact end (522) may be provided in the shape of a roughly cylindrical pipe. The cross-sectional shapes of the body (523) and the contact end (522) may be provided to be identical, and the body (523) and the contact end (522) may be formed integrally. The upper portion of the shaft (40) may be accommodated at the end of the body (523). The outer surface (41) of the shaft (40) may be supported by the contact end (522). The support surface (44) of the shaft (40) supported by the contact end (522) may be formed on the outer surface (41) of the shaft (40). At this time, the lubricant may be guided to pass through the oil supply path (not shown) in a downward direction along the support surface (44) and be discharged to the outside of the shaft (40).

[0136] However, the bearing part (620) is not limited to the embodiment in which it is formed in a protruding manner. The bearing part (620) provided on the lower surface (111) of the body (110) may include a recess (621) formed by being sunken in the lower surface (111). A contact end (622) may be provided on the inner side of the recess (621). The upper end of the shaft (40) may be received in the contact end (622). The bearing part (620) formed on the body (110) may include the recess (621), and the recess (621) may receive the shaft (40), thereby supporting the outer surface (41) of the shaft (40). The support surface (44) of the upper end of the shaft (40) supported by the contact end (622) may be provided on the outer surface (41) of the shaft (40). At this time, the lubricant may be guided downward along the support surface (44) through a lubricating oil passage (not shown) and discharged to the outside of the shaft (40).

[0137] FIG. 20 is a side cross-sectional view illustrating a state of controlling oil supply through a buffer bearing section of a compressor according to one embodiment of the present invention.

[0138] In the following description, for convenience of explanation, configurations that are substantially the same or similar to those described with reference to FIG. 1 may be omitted or briefly described.

[0139] Referring to FIG. 20, the compressor (1) may include a housing (10), a driving unit (30), a compression unit (20), and a buffer (100). The housing (10), the driving unit (30), the compression unit (20), and the buffer (100) may be substantially the same as or similar to the housing (10), the driving unit (30), the compression unit (20), and the buffer (100) described with reference to FIG. 1.

[0140] The buffer (100) may not include a filter (150). The oil supplied to the bearing part (120) may be discharged to the outside of the shaft (40) along the gap between the bearing part (120) and the shaft (40). The lubricating oil may pass through an oil supply passage (not shown) and be guided to the upper space of the driving part (30). The oil may flow into the upper space of the buffer (100) through a hole (140) formed in the buffer (100). The lubricating oil supplied to the bearing part (120) may flow out to the outside of the shaft (40) and then pass through the hole (140) to move to the upper space of the buffer (100). The vaporized oil may pass through the hole (140) together with the rising refrigerant gas. The oil may flow out to the outside of the compressor through the discharge pipe (5) of the small compressor.

[0141] FIG. 21 is a side cross-sectional view illustrating a method for controlling oil supply through a buffer bearing section of a compressor according to one embodiment of the present invention.

[0142] In the following description, for convenience of explanation, configurations that are substantially the same or similar to those described with reference to FIGS. 1 and 20 may be omitted or briefly described.

[0143] Referring to FIG. 21, the compressor (1) may include a housing (10), a driving unit (30), a compression unit (20), and a buffer (700). The housing (10), the driving unit (30), the compression unit (20), and the buffer (700) may be substantially the same as or similar to the housing (10), the driving unit (30), the compression unit (20), and the buffer (100) described with reference to FIG. 1 and FIG. 20.

[0144] The buffer (700) includes a body (710), a bearing portion (720), a frame portion (130), and a hole (140), and may further include a through hole (760) penetrating the center of the body (710). The through hole (760) may be provided to penetrate the upper surface (712) of the body (710) and the bearing portion (720) along the central axis (48). The diameter of the through hole (760) may be formed to be approximately several micrometers to several tens of micrometers. The through hole (760) may be formed to additionally control the amount of oil that has risen to the hollow portion (45). The oil that has risen through the hollow portion (45) may be discharged to the outside of the shaft (40) through a lubrication path (not shown) formed between the outer surface of the bearing portion (720) and the upper end of the shaft (40) and the through hole (760) provided in the buffer (700). Oil discharged through the through hole (760) can be guided to the upper part of the buffer (700).

[0145] A compressor (1) according to one embodiment comprises a housing (10), a drive unit (30) provided inside the housing (10) to generate power and including a shaft (40) having a stator (31), a rotor (32) and a hollow (45), a rolling piston (23) into which the shaft (40) is inserted and which rotates by receiving power from the drive unit (30), a compression unit (20) including a cylinder (21) provided with a compression chamber (22) for compressing refrigerant, and a shock absorber (100; 200; 300; 400; 500; 600; 700) provided on the upper portion of the drive unit (30) to reduce vibration of the shaft (40).

[0146] The above-described buffer (100; 200; 300; 400; 500; 600; 700) includes a body (110; 210; 710) coupled to the inside of the housing (10), and a bearing part (120; 320; 420; 520; 620; 720) formed on the lower surface (111; 211; 711) of the body (110; 210; 710) to rotatably support the upper portion of the shaft (40), and the oil of the hollow (45) is guided to the upper space of the driving part (30) through a space between one surface of the bearing part (120; 320; 420; 520; 620; 720) and one surface of the shaft (40).

[0147] The above hollow (45) can penetrate the driving part (30) and the compression part (20) to supply oil to the bearing part (120; 320; 420; 520; 620; 720).

[0148] The above-mentioned buffer (100; 200; 300; 400; 500; 600) includes the body (110; 210) provided in a disc shape, and the body (110; 210) has the bearing part (120; 320; 420; 520; 620) provided at a position corresponding to the hollow (45) on the lower surface (111; 211) facing the shaft (40), and the position corresponding to the hollow (45) on the upper surface (112; 212) may be provided so as not to be penetrated.

[0149] The above buffer (100; 200; 300; 400; 500; 600; 700) may include a hole (140; 240) through which refrigerant gas passes in the body (110; 210; 710).

[0150] The above buffer (100; 200; 300; 400; 500; 600; 700) may include a filter (150a; 150b; 150c) provided to block the hole (140; 240) in order to filter the vaporized oil mixed in the refrigerant gas passing through the hole (140; 240).

[0151] The above buffer (100; 200; 300; 400; 500; 600; 700) includes a rim portion (130) formed to surround the body (110; 210; 710) along its outer diameter, and the rim portion (130) may be provided so that its outer diameter gradually narrows toward the lower side of the housing (10).

[0152] The housing (10) may include a step portion (19) protruding toward the shaft (40) to limit movement of the buffer (100; 200; 300; 400; 500; 600; 700) inserted into the housing (10) in the downward direction of the housing (10).

[0153] The above driving unit (30) may include a limiting projection (39) formed to protrude from the upper end of the driving unit (30) toward the buffer (100; 200; 300; 400; 500; 600; 700) to support the lower surface (111; 211; 711) of the body (110; 210; 710) of the buffer (100; 200; 300; 400; 500; 600; 700) in order to limit movement of the buffer (100; 200; 300; 400; 500; 600; 700) inserted into the housing (10) toward the lower side of the housing (10).

[0154] The above bearing part (120; 320; 720) includes a contact projection (121; 321; 721) that protrudes from the center of the lower surface (111; 211; 711) of the body (110; 210; 710) toward the upper end of the shaft (40) and is inserted into the hollow (45), and a contact end (122; 322; 722) provided at the end of the contact projection (121; 321; 721) to support the inner surface (42) of the shaft (40), and the contact end (122; 322; 722) may be provided to taper at a predetermined angle toward the lower end of the contact projection (121; 321; 721).

[0155] The upper end of the shaft (40) may be provided so that the inner surface (42) of the shaft (40) has the same inclination as the contact end (122; 322; 722).

[0156] The above contact projection (121; 321; 721) includes a body (123; 323; 723) provided in a cylindrical shape between the contact end (122; 322; 721) and the lower surface (111; 211; 711) of the body (110; 210; 710), and the diameter of the body (123; 323; 723) may be provided to be smaller than the maximum diameter of the contact end (122; 322; 722).

[0157] The above hole (240) is formed to extend along a spiral orbit from the outside of the body (210) to the center of the body (210), and the size of the hole (240) may be made to become narrower as it goes toward the center of the body (210).

[0158] The bearing portion (620) includes a recess (621) formed by sinking the lower surface (111) supported by the shaft (40), and the inner surface of the recess (621) may be formed to rotatably support the outer surface (41) of the upper end of the shaft (40). A contact end (622) may be formed on the inner surface of the recess (621).

[0159] The above filter (150a; 150b; 150c) may include a metal mesh filter (151a; 151b; 151c) and an oil-repellent coating film (152a; 152b; 152c).

[0160] The bearing part (720) may include a through hole (760) formed to penetrate the central portion of the body (710) and the bearing part (720) to control the amount of oil supplied through the hollow (45).

[0161] A compressor (1) according to the idea of ​​the present invention comprises a driving unit (30) provided inside the housing (10) to generate power and including a shaft (40) having a stator (31), a rotor (32) and a hollow (45), a compression unit (20) including a rolling piston (23) into which the shaft (40) is inserted and which rotates by receiving power from the driving unit (30), and a cylinder (21) having a compression chamber (22) for compressing refrigerant, and a buffer (100; 200; 300; 400; 700) coupled to the inside of the housing (10) and including a bearing unit (120; 320; 420; 720) which controls the supply of oil to the upper portion of the driving unit (30) through the hollow (45) of the shaft (40) and rotatably supports the upper end of the shaft (40).

[0162] The above-mentioned buffer (100; 200; 300; 700) includes a body (110; 210; 710) provided to be fixed to the inside of the housing (10) and a bearing part (121; 321; 721) including a contact projection (121; 321; 721) protruding from the lower surface (111; 211; 711) of the body (110; 210; 710), and the contact projection (121; 321; 721) includes a body (123; 323; 723) provided in a cylindrical shape and a contact end (122; 322; 722) formed at the end of the contact projection (121; 321; 721) such that the size of the radial cross-section of the contact projection (121; 321; 721) becomes smaller as it gets closer to the shaft (40), and The contact end (122; 322; 722) may be accommodated in the hollow (45) to rotatably support the inner surface (42) of the shaft (40).

[0163] The above-mentioned buffer (100; 200; 300; 700) includes the body (110; 210; 710) provided in a disc shape, and a rim portion (130) provided to be supported on the inner surface of the housing (10) along the side surface of the body (110; 210; 710), and the outer side of the rim portion (130) that comes into contact with the inner surface of the housing (10) may be provided so that the outer diameter thereof gradually decreases toward the lower side of the housing (10).

[0164] The above buffer (100; 200; 300; 700) may include a hole (140; 240) provided to allow refrigerant gas to pass through at a position radially spaced from the center of the body (110; 210; 710).

[0165] The above buffer (100; 200; 300; 700) may include a filter (150a; 150b; 150c) provided to block the hole (140; 240).

[0166] According to the idea of ​​the present invention, since the compressor's shock absorber is installed inside the housing, vibration caused by eccentricity during operation of the compressor can be reduced.

[0167] According to the idea of ​​the present invention, the compressor has a bearing formed at the top of the shaft, so that the bearing can support the shaft so as to be rotatable.

[0168] According to the idea of ​​the present invention, a hollow space connecting the lower and upper parts of the compressor is provided in the shaft, so that lubricating oil can be supplied to the bearing provided at the upper end of the shaft.

[0169] According to the idea of ​​the present invention, by placing the buffer at the upper end of the hollow, the discharge flow rate of oil moving through the hollow can be controlled.

[0170] The above illustrates and describes specific embodiments. However, the invention is not limited to the above-described embodiments, and those skilled in the art will readily appreciate that various modifications and implementations can be made without departing from the spirit and scope of the invention as set forth in the claims below.

Claims

1. Housing; A driving unit provided inside the housing to generate power and including a stator, a rotor, and a hollow shaft; A compression unit including a cylinder having a rolling piston that rotates by receiving power from the driving unit through which the shaft is inserted, and a compression chamber that compresses refrigerant; and A shock absorber provided on the upper part of the driving unit to reduce vibration of the shaft; The above buffer includes a body coupled to the inside of the housing, and a bearing part formed on the lower surface of the body to rotatably support the upper portion of the shaft. A compressor in which the hollow oil is guided to the upper space of the driving unit through a space between one surface of the bearing unit and one surface of the shaft.

2. In paragraph 1, The above hollow portion is a compressor that penetrates the driving section and the compression section to supply oil to the bearing section.

3. In paragraph 2, The above buffer includes the body provided in a disc shape, A compressor in which the body is provided with the bearing portion at a position corresponding to the hollow on the lower surface facing the shaft, and the position corresponding to the hollow on the upper surface is provided so as not to be penetrated.

4. In paragraph 3, The above buffer is a compressor including a hole through which refrigerant gas passes in the body.

5. In paragraph 4, The above buffer is a compressor including a filter provided to block the hole in order to filter the vaporized oil mixed in the refrigerant gas passing through the hole.

6. In paragraph 4, The above buffer includes a rim formed to surround the body along the outer diameter of the body, A compressor in which the outer diameter of the above-mentioned edge portion gradually narrows toward the lower side of the housing.

7. In paragraph 6, A compressor wherein the housing includes a stepped portion protruding toward the shaft to limit movement of the buffer inserted into the housing in a downward direction of the housing.

8. In paragraph 6, A compressor in which the driving unit includes a limiting projection formed to protrude from the upper end of the driving unit toward the buffer to support the lower surface of the body of the buffer in order to limit movement of the buffer inserted into the housing in a downward direction of the housing.

9. In paragraph 4, The bearing part includes a contact projection that protrudes from the center of the lower surface of the body toward the upper end of the shaft and is inserted into the hollow, and a contact end that is provided to support the inner surface of the shaft at the end of the contact projection. A compressor in which the contact end is provided to taper at a predetermined angle toward the lower portion of the contact projection.

10. In paragraph 9, A compressor in which the upper end of the shaft is provided such that the inner surface of the shaft is tapered so as to have the same inclination as the contact end.

11. In paragraph 9, A compressor in which the above contact projection includes a body provided in a cylindrical shape between the contact end and the lower surface of the body, and the diameter of the body is provided to be smaller than the maximum diameter of the contact end.

12. In paragraph 9, A compressor in which the hole is formed to extend along a spiral path from the outside of the body to the center of the body, and the hole size becomes narrower as it approaches the center of the body.

13. In paragraph 4, A compressor in which the bearing portion includes a recess formed by sinking the lower surface supported by the shaft, and the inner surface of the recess is provided to rotatably support the outer surface of the upper end of the shaft.

14. In paragraph 5, The above filter is a compressor including a metal mesh filter and an oil-repellent coating film.

15. In paragraph 2, A compressor including a through hole formed to penetrate the central portion of the bearing portion and the body to control the amount of oil supplied through the hollow portion.

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