compressor

Abstract

The present disclosure relates to a compressor including a housing, a compression unit disposed in the housing, and a driving unit, wherein the compression unit includes a cylinder having a compression space, a piston reciprocating in the cylinder, a discharge cover covering the compression space, a first chamber disposed in the discharge cover and having a discharge space and a coupling space, a second chamber disposed in the discharge cover and defining a movement passage through which a refrigerant moves, a rib disposed in the movement passage, and a communication portion through which the discharge space and the movement passage communicate with each other, wherein the refrigerant discharged from the compression space moves along the discharge space, the communication portion, and the movement passage, whereby pulsation due to the discharge of the refrigerant can be reduced.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a compressor. BACKGROUND

[0002] As is well known, a compressor is a device that receives power from a power generating device such as an electric motor or a turbine and compresses a working fluid such as air or a refrigerant (refrigerant gas). In particular, compressors are widely used in industrial fields and home appliances, and in particular, in vapor compression refrigeration cycles (hereinafter referred to as "refrigeration cycles") and the like.

[0003] According to a method of compressing a refrigerant, these compressors can be classified into reciprocating compressors, rotary compressors, and scroll compressors.

[0004] Such a compressor generally includes a housing or a casing (hereinafter referred to as "casing") that defines an airtight space, a compression unit provided inside the casing, and a driving unit (or motor unit) that applies a driving force to the compression unit.

[0005] The compression unit includes a compression space, a suction port and a discharge port that communicate with the compression space, a suction valve for opening and closing the suction port, and a discharge valve for opening and closing the discharge port.

[0006] The compressor sucks a gas or a refrigerant (hereinafter referred to as "gas") into the casing through a suction pipe, and the gas sucked into the casing is introduced into the compression space through the suction port and compressed in the compression space.

[0007] The gas compressed in the compression space moves to a discharge pipe through the discharge port, and is then discharged out of the casing through the discharge pipe.

[0008] However, in the related art compressor, vibrations and noises are generated from moving parts during suction, compression, and discharge of the gas.

[0009] In particular, when the compressed gas is discharged, the noise is greatly increased. Therefore, the compressor includes a discharge muffler provided in a discharge side flow path of the compression unit to attenuate the noise generated during discharge of the gas.

[0010] The discharge muffler includes a plurality of partition walls in which a plurality of discharge spaces are defined, and a plurality of outlet holes are formed through the plurality of partition walls so that the discharge spaces can communicate with each other.

[0011] The discharge muffler is configured to reduce pulsation when the discharged refrigerant alternately passes through the discharge spaces (resonance cavities) and the outlet holes in the discharge muffler in a compressed state. Here, the discharge spaces and the outlet holes are set in consideration of frequency response characteristics.

[0012] However, in the related art compressor, since the outlet hole is formed through the partition wall having a relatively thin thickness, sufficient acoustic equivalent mass cannot be secured, which is disadvantageous to reduce pulsation due to discharge of the refrigerant.

[0013] In particular, the acoustic equivalent mass is inversely proportional to the cross-sectional area of the outlet hole and is proportional to the length of the outlet hole. When the cross-sectional area of the outlet hole is reduced to increase the acoustic equivalent mass, the flow resistance rapidly increases, which reduces the efficiency of the compressor.

[0014] Furthermore, when separate pipes are directly attached to communicate the discharge spaces with each other, the manufacturing process becomes complicated.

[0015] In the discharge cover having a narrow internal space, it is also difficult to secure the installation space of the pipes for communicating between the discharge spaces.

[0016] It is also difficult to connect the pipes for communicating between the discharge spaces to the partition wall, and it is difficult to secure the reliability of the connection portion between the pipes and the partition wall.

[0017] If the pipes for communicating between the discharge spaces are installed via the outside of the discharge cover to avoid the narrow internal space of the discharge cover, the area of the pipes (of high-temperature and high-pressure refrigerant) passing through the outside of the discharge cover exchanges heat with the refrigerant in the housing. As a result, the temperature and pressure of the refrigerant (of high-temperature and high-pressure) in the pipes decrease, and the temperature of the refrigerant (before compression) outside the discharge cover increases, thereby reducing the refrigerant compression efficiency.

[0018] [Related Art Documents]

[0019] [Patent Documents]

[0020] (Patent Document 1) KR100314036 B1. SUMMARY

[0021] Accordingly, the disclosure describes a compressor capable of reducing pulsation due to discharge of the refrigerant.

[0022] The disclosure also describes a compressor capable of preventing generation of noise during discharge of the refrigerant without increasing flow resistance.

[0023] The disclosure also describes a compressor capable of preventing temperature reduction of the discharged refrigerant and increasing acoustic equivalent mass of the discharge muffler.

[0024] The disclosure also describes a compressor capable of eliminating use of a pipe to connect the discharge spaces in the discharge muffler and preventing reduction in operating efficiency due to the pipe.

[0025] To achieve these and other advantages and in accordance with the purpose of this specification, a compressor can be configured such that refrigerant moves through a coupling space between a first chamber and a second chamber.

[0026] More specifically, the compressor can include a discharge cover, and a first chamber and a second chamber coupled to an inside of the discharge cover in an axial direction. The refrigerant can move in a coupling space defined in a peripheral direction such that one end portion of the second chamber can be inserted into the first chamber in the axial direction. This can increase an acoustic equivalent mass of the discharge cover in which the refrigerant moves.

[0027] Accordingly, pulsation generated due to discharge of the refrigerant from the compression space can be reduced.

[0028] Further, the refrigerant can pass through the coupling space defined in the first chamber provided in the discharge cover. Accordingly, thermal energy of the refrigerant moving in the discharge cover can be prevented from being transferred to the refrigerant outside the discharge cover.

[0029] This can prevent a decrease in compression efficiency of the refrigerant due to an increase in temperature of the refrigerant outside the discharge cover.

[0030] The compressor can include a housing, a compression unit provided in the housing to compress a refrigerant, and a driving unit provided in the housing to apply a driving force to the compression unit.

[0031] The compression unit can include a cylinder in which a compression space is defined, and a piston reciprocating within the cylinder and changing the compression space. A discharge cover to cover the compression space can be provided at one side of the cylinder.

[0032] The first chamber and the second chamber coupled to each other to define a plurality of discharge spaces can be provided in the discharge cover in the axial direction.

[0033] A compressor according to one embodiment of the disclosure can include a housing, a compression unit provided in the housing to compress a refrigerant, and a driving unit provided in the housing to apply a driving force to the compression unit. The compression unit can include a cylinder in which a compression space is defined, a piston reciprocating within the cylinder and changing the compression space, a discharge cover to cover the compression space, a first chamber provided in the discharge cover and having a discharge space communicating with the compression space, and a coupling space separated from the discharge space, the coupling space being formed at an outer side of the discharge space in a peripheral direction and having one side open in an axial direction, a second chamber provided in the discharge cover and having an end portion to block an opening of the coupling space in the axial direction when the second chamber is coupled, thereby defining a movement passage for movement of the refrigerant, a rib provided in the movement passage to block the movement passage, and a communication portion through which the discharge space and the movement passage communicate with each other.

[0034] Here, the movement passage can have a narrow width and a long length.

[0035] The cross-sectional area of the rib can be substantially the same as the flow cross-sectional area of the movement passage so as to block the movement passage, which can allow the refrigerant introduced into the movement passage to move in only one direction without passing through the rib.

[0036] With this configuration, the refrigerant discharged from the compression space can move along the movement passage, which can increase the acoustic equivalent mass, thereby reducing pulsation.

[0037] Accordingly, noise generated due to pulsation during operation of the compressor can be prevented.

[0038] The housing can have a cylindrical shape.

[0039] The length of the housing can be greater than the diameter thereof.

[0040] The housing can be installed such that the length of the housing is disposed in a horizontal direction.

[0041] The cylinder can have a cylindrical shape with both ends open.

[0042] The piston can have a cylindrical shape with one end portion closed.

[0043] The piston can have a head portion formed on one end portion thereof.

[0044] An intake port through which the refrigerant is sucked can be formed through the head portion.

[0045] An intake valve that opens and closes the intake port can be provided at the head portion.

[0046] A discharge valve that selectively opens and closes the compression space can be provided at one side of the cylinder.

[0047] The piston can reciprocate within the cylinder between a top dead center and a bottom dead center.

[0048] A frame can be provided at the outside of the cylinder.

[0049] The frame can include a body portion surrounding the outer surface of the cylinder, and a flange portion extending in a radial direction from one end portion of the body portion.

[0050] The driving unit can include a stator, and a mover reciprocating with respect to the stator.

[0051] The stator can include an outer stator and an inner stator disposed concentrically with each other, and a stator coil wound around the outer stator and / or the inner stator.

[0052] The mover can include a permanent magnet.

[0053] The permanent magnet can be disposed between the outer stator and the inner stator to reciprocate in the axial direction.

[0054] In one embodiment, the communication portion can include an inlet and an outlet, the inlet and the outlet being spaced apart from each other, and the rib being interposed between the inlet and the outlet in the circumferential direction.

[0055] The inlet and the outlet can be disposed adjacent to the rib.

[0056] With this configuration, the refrigerant introduced into the moving passage through the inlet disposed at one side of the rib can move in the circumferential direction of the first chamber along almost the entire circumference of the first chamber. Therefore, the moving length within the moving passage can be significantly increased.

[0057] This can significantly increase the equivalent mass of the moving passage, and thus can significantly reduce the pulsation and the noise caused by the pulsation.

[0058] In one embodiment, the inlet, the outlet, and the moving passage can have the same cross-sectional area.

[0059] Since having the uniform cross-sectional area, the flow resistance of the refrigerant can be constantly maintained without increasing during the movement of the refrigerant.

[0060] In one embodiment, the first chamber can include an outer wall and an inner wall disposed concentrically, and a coupling space being defined between the outer wall and the inner wall.

[0061] Therefore, since the moving passage along which the refrigerant moves is defined at the inside of the outer wall, the heat energy of the refrigerant in the discharge cover can be prevented from being transferred to the outside of the discharge cover by the thickness of the outer wall of the first chamber (the thickness of the outer wall) and the thickness of the discharge cover (the thickness of the wall surface).

[0062] The second chamber can include a cylindrical portion, one end portion of the cylindrical portion being interposed into the coupling space.

[0063] The inlet and the outlet can be formed by cutting the cylindrical portion.

[0064] In one embodiment, the inner wall of the first chamber can include a first inner wall disposed at the inside of the outer wall, a second inner wall protruding from the first inner wall in the axial direction, and a plurality of outflow guides protruding from the second inner wall in the radial direction and spaced apart from each other in the circumferential direction.

[0065] The discharge space can include a first discharge space defined at the inside of the first inner wall, a second discharge space defined at the inside of the second inner wall, a third discharge space defined at the inside of the outflow guide, and a fourth discharge space defined at the outside of the outflow guide.

[0066] The third discharge space and the movement passage can be communicated with each other through the inlet.

[0067] Accordingly, the refrigerant in the third discharge space can be introduced into the movement passage through the inlet.

[0068] The fourth discharge space and the movement passage can be communicated with each other through the outlet.

[0069] Accordingly, the refrigerant moving along the movement passage can move to the fourth discharge space through the outlet.

[0070] In one embodiment, the second inner wall can include an arched segment formed in an arched shape, and a straight segment linearly connecting both end portions of the arched segment.

[0071] The second chamber can include a protruding portion protruding inward in the axial direction and the radial direction to be in contact with the straight segment.

[0072] The fourth discharge space can be defined at the inside of the protruding portion.

[0073] Accordingly, an inner surface of a portion of the side portion of the protruding portion provided in the axial direction can be in contact with an outer surface of the straight segment, so that the first chamber and the second chamber can be accurately coupled to each other at a preset position.

[0074] In one embodiment, the first inner wall can include a first outlet hole through which the refrigerant in the first discharge space moves to the second discharge space, and the second inner wall can include a second outlet hole through which the refrigerant in the second discharge space moves to the third discharge space.

[0075] Accordingly, the refrigerant discharged from the compression space can move to the third discharge space while sequentially passing through the first discharge space, the first outlet hole, the second discharge space, and the second outlet hole.

[0076] The ribs can include first ribs and second ribs spaced apart from each other in the circumferential direction to divide the movement passage into first and second movement passages in the circumferential direction.

[0077] Accordingly, the movement passage can be divided into the first and second movement passages having relatively short lengths.

[0078] The first ribs can be provided between (at the inside of) two extension lines respectively extending in the axial direction from the outflow guide portions.

[0079] Accordingly, one end portion of each of the first and second movement passages can be positioned between the plurality of outflow guide portions.

[0080] In one embodiment, the first rib and the second rib can be disposed to face each other so that the first moving passage and the second moving passage can have the same length.

[0081] Here, since the first moving passage and the second moving passage have the same cross-sectional area, the first moving passage and the second moving passage have substantially the same equivalent mass.

[0082] In one embodiment, the inlet can include a first inlet communicating with the first moving passage, and a second inlet communicating with the second moving passage.

[0083] The first inlet and the second inlet can be disposed between a plurality of extension lines extending axially from the outflow guide portion.

[0084] Accordingly, the refrigerant in the third discharge space can move to the first moving passage and the second moving passage through the first inlet and the second inlet, respectively.

[0085] The outlet can include a first outlet communicating with the first moving passage, and a second outlet communicating with the second moving passage.

[0086] In one embodiment, the cross-sectional area of the second outlet hole can be the same as the sum of the cross-sectional area of the first moving passage and the cross-sectional area of the second moving passage.

[0087] Accordingly, when the refrigerant passing through the second outlet hole moves bifurcatedly into the first moving passage and the second moving passage, an increase in flow resistance can be prevented.

[0088] Here, the first inlet and the second inlet can have the same cross-sectional area.

[0089] The first outlet and the second outlet can have the same cross-sectional area.

[0090] In one embodiment, the first chamber can further include a division guide portion dividing the third discharge space into a first partial discharge space and a second partial discharge space.

[0091] The third discharge space can be divided into the first partial discharge space and the second partial discharge space by the division guide portion.

[0092] Here, the division guide portion can be disposed at a position at which the first partial discharge space and the second partial discharge space have the same volume.

[0093] The second outlet hole can include a first partial outlet hole communicating with the first partial discharge space, and a second partial outlet hole communicating with the second partial discharge space.

[0094] The first inlet can communicate with the first partial discharge space, and the second inlet can communicate with the second partial discharge space.

[0095] Accordingly, the refrigerant in the second discharge space can flow into the first and second partial discharge spaces through the first and second partial outlet holes, respectively, and move to the first and second moving passages through the first and second inlets.

[0096] In one embodiment, the first partial outlet hole can have the same cross-sectional area as the first moving passage.

[0097] The second partial outlet hole can have the same cross-sectional area as the second moving passage.

[0098] Accordingly, an increase in flow resistance due to a change in flow cross-sectional area during movement of the refrigerant can be prevented.

[0099] In one embodiment, the discharge cover can include a discharge recess that can communicate with the outside.

[0100] The second chamber can include an outlet portion having an outlet recess through which the refrigerant in the fourth discharge space is discharged to the discharge recess.

[0101] In one embodiment, the housing can include a discharge pipe through which the refrigerant is discharged, and the discharge recess can include a discharge hole that communicates with the discharge pipe.

[0102] The discharge hole can be connected to one end of a loop pipe, the other end of which communicates with the discharge pipe.

[0103] In one embodiment, the cylinder can include a nozzle to inject the refrigerant into a gap defined between an inner peripheral surface of the cylinder and an outer peripheral surface of the piston.

[0104] The nozzle can penetrate a wall surface of the cylinder in a radial direction.

[0105] With the above-described configuration, friction between the cylinder and the piston can be reduced.

[0106] The discharge recess can include a gas bearing hole that communicates with the nozzle.

[0107] The refrigerant (gas) in the discharge recess can move through the gas bearing hole and then flow along a refrigerant (gas) movement path defined in the frame (flange portion and body portion) so as to be introduced into the cylinder through the nozzle.

[0108] In one embodiment, the outlet portion can protrude from the cylindrical portion in a radial direction and extend in an axial direction, and the outlet recess can be formed through an inside of the outlet portion in the axial direction.

[0109] Here, the inner end portion of the outlet groove can communicate with the inner surface of the cylindrical portion in the radial direction.

[0110] Thus, the refrigerant discharged from the compression space after being compressed can sequentially move to the discharge groove via the first discharge space, the first outlet hole, the second discharge space, the second outlet hole, the third discharge space, the inlet, the movement passage, the outlet, and the fourth discharge space.

[0111] As described above, according to the embodiment of the present disclosure, a relatively narrow and long movement passage can be defined in a coupling space defined between the first chamber and the second chamber coupled to each other in the axial direction within the discharge cover, thereby increasing the equivalent mass and thus reducing the noise.

[0112] Further, since the movement passage is defined within the first chamber provided in the discharge cover, the heat energy of the refrigerant can be effectively prevented from being transferred outside the discharge cover as the refrigerant moves along the movement passage.

[0113] Since the communication portion includes the inlet and the outlet spaced apart from each other, the rib is interposed between the inlet and the outlet, so the entire inner region of the movement passage can be used as a space in which the refrigerant actually moves.

[0114] Since the inlet, the outlet, and the movement passage have the same cross-sectional area, an increase in flow resistance due to a change in flow cross-sectional area of the refrigerant can be prevented.

[0115] With such a configuration, in which the first discharge space is defined at the inner side of the first inner wall of the first chamber, the second discharge space is defined at the inner side of the second inner wall, the pair of radially extending outflow guide portions is provided at the outer side of the second inner wall, the third discharge space is defined at the inner side of the outflow guide portions, the fourth discharge space is defined at the outer side of the outflow guide portions, and the refrigerant in the third discharge space moves to the fourth discharge space via the movement passage, the acoustic equivalent mass of the refrigerant movement path can be significantly increased. This significantly reduces the vibration and the noise.

[0116] The first rib and the second rib can be provided in the movement passage and spaced apart from each other in the circumferential direction to divide the movement passage into the first movement passage and the second movement passage. Thus, an increase in flow resistance of the refrigerant is prevented, and the equivalent mass can be increased, thereby reducing the vibration and the noise.

[0117] The first rib can be disposed between extension lines extending in the axial direction from the outlet guide portion, so that one end portion of the first movement passage and one end portion of the second movement passage can be positioned at the inner side of the flow-out guide portion. Thus, the refrigerant in the third discharge space can bifurcately move into the first movement passage and the second movement passage.

[0118] The cross-sectional area of the second outlet hole is the same as the sum of the flow cross-sectional area of the first movement passage and the flow cross-sectional area of the second movement passage, so that an increase in flow resistance due to a change in flow cross-sectional area when the refrigerant moves can be prevented.

[0119] The first chamber can include a division guide portion for dividing the third discharge space defined at the inner side of the flow-out guide portion into a first partial discharge space and a second partial discharge space, the second discharge space communicating with the second partial discharge space through a first partial outlet hole, and the second discharge space communicating with the second partial discharge space through a second partial outlet hole. With this configuration, the refrigerant in the second discharge space can bifurcately move into the first partial discharge space and the second partial discharge space. BRIEF DESCRIPTION OF DRAWINGS

[0120] Figure 1 is a perspective view illustrating a compressor according to one embodiment of the disclosure.

[0121] Figure 2 is a cross-sectional view illustrating Figure 1 the compressor.

[0122] Figure 3 is an exploded perspective view illustrating Figure 2 the discharge cover assembly.

[0123] Figure 4 is an exploded perspective view illustrating the frame and Figure 2 the discharge cover assembly.

[0124] Figure 5 is a view illustrating the inside of Figure 2 the discharge cover.

[0125] Figure 6 is a view illustrating the outside of Figure 5 the discharge cover.

[0126] Figure 7 is a view illustrating the outside of Figure 2 the first chamber.

[0127] Figure 8 is a view illustrating the inside of Figure 7 the first chamber.

[0128] Figure 9 is a view illustratingFigure 7 cross-sectional view of the second discharge hole region of the first chamber.

[0129] Figure 10 is a view showing the outside of the second chamber of the Figure 2

[0130] Figure 11 is a view showing the inside of the second chamber of the Figure 10

[0131] Figure 12 is an enlarged view showing the coupling region between the first chamber and the second chamber of the Figure 2

[0132] Figure 13 is a plan cross-sectional view showing the rib region of the Figure 12

[0133] Figure 14 is a plan cross-sectional view showing the coupling region between the first chamber and the second chamber of the Figure 12

[0134] Figure 15 is a view showing the movement of the refrigerant along the movement passage of the Figure 14

[0135] Figure 16 is a view showing the movement of the refrigerant in the discharge cap of the Figure 2

[0136] Figure 17 is a simplified view showing the movement of the refrigerant inside the discharge cap of the Figure 16

[0137] Figure 18 is a perspective view showing a state before the first chamber and the second chamber of the compressor according to another embodiment are coupled.

[0138] Figure 19 Figure 18 cross-sectional view of the second discharge hole region of the first chamber.

[0139] Figure 20 Figure 18 cross-sectional view of the coupling region between the first chamber and the second chamber of the

[0140] Figure 21 Figure 20 plan cross-sectional view showing the coupling region between the first chamber and the second chamber of the

[0141] Figure 22 Figure 21

[0142] ​​​​​​​​​​​​​Figure 23 It is shown Figure 17 A simplified diagram of refrigerant movement within the discharge cover.

[0143] Figure 24 This is a perspective view showing the state of the compressor before the first and second chambers are connected according to yet another embodiment.

[0144] Figure 25 It is shown Figure 24 A planar cross-sectional view of the connection area between the first chamber and the second chamber.

[0145] Figure 26 It shows along Figure 25 A view of the refrigerant movement through the moving channel.

[0146] Figure 27 It is shown Figure 23 A simplified diagram of refrigerant movement within the discharge cover. Detailed Implementation

[0147] The embodiments disclosed in this specification will now be described in detail with reference to the accompanying drawings. Throughout this specification, identical or equivalent components may be referred to by the same or similar reference numerals even in different embodiments, and their description will not be repeated. The singular expressions used herein may encompass the plural expressions unless they have a meaning clearly different from the context. In describing the invention, detailed explanations of related known techniques or constructions are omitted if it is deemed unnecessary to depart from the spirit of this disclosure, but this will be understood by those skilled in the art. It should be noted that the accompanying drawings are provided to facilitate understanding of the embodiments disclosed in this specification and should not be construed as limiting the technical concepts disclosed in this specification by means of the drawings.

[0148] Figure 1 This is a perspective view showing a compressor according to one embodiment of the present disclosure, and Figure 2 It is shown Figure 1 A cross-sectional view of the compressor. (See attached image.) Figure 1 and Figure 2 As shown, the compressor according to this embodiment may include a housing 110, a compression unit 200, and a drive unit 400.

[0149] The housing 110 may have a basic cylindrical shape.

[0150] The housing 110 may include a housing body 120 and a cover 125, the housing body having open sides, and the cover being attached to close the opening of the housing body 120.

[0151] The cover 125 can include, for example, a disc portion 1251 having a disc shape, and a skirt portion 1252 protruding from an edge of the disc portion 1251 in an axial direction and extending in a circumferential direction. An outer surface of, for example, the skirt portion 1252 can be in close contact with an inner surface of the housing body 120. These covers 125 can be coupled to the hermetically sealed end portions of the housing body 120, respectively. Accordingly, a hermetic space can be defined in the housing 110.

[0152] The compressor according to the present embodiment can be provided such that the housing 110 is horizontally disposed in a length direction thereof. This can significantly reduce a height of a mounting space of the compressor.

[0153] When the compressor is installed in a mechanical room of, for example, a refrigerator, a height of the mechanical room can be significantly reduced. Since the height of the mechanical room is reduced without increasing an external height of the refrigerator (cabinet), sizes of food storage spaces (freezing compartment, refrigerating compartment, storage compartment) defined in the cabinet can be significantly increased.

[0154] In this embodiment, in Figure 1 The horizontal direction in the above-mentioned

[0155] Figure 1 The left-right direction in the above-mentioned

[0156] For example, a left end portion of the housing 110 of the compressor can be referred to as a front end portion of the housing 110, and a right end portion of the housing 110 can be referred to as a rear end portion of the housing 110.

[0157] The suction pipe 130 can be provided at the housing 110 through which a gas (refrigerant) to be compressed is sucked.

[0158] The suction pipe 130 can be provided at a rear end portion of the housing 110.

[0159] The housing 110 can be provided with a discharge pipe 135 through which a compressed gas (refrigerant) is discharged.

[0160] The discharge pipe 135 can be connected to one side surface of the housing 110.

[0161] A process pipe 140 for filling a refrigerant into the housing 110 can be provided at one side of the discharge pipe 135.

[0162] The housing 110 can be provided with a terminal 150 connected to an external power source.

[0163] The terminal 150 can be provided on one side surface of the housing 110.

[0164] The housing 110 can be provided with a plurality of legs 155 by which the compressor is fastened to an object.

[0165] The plurality of legs 155 can be provided as a pair of legs on each of both sides of the lower portion of the housing 110.

[0166] The plurality of legs 155 can be provided as a pair of legs on each of the front lower portion and the rear lower portion of the housing 110. A plane passing through end portions of the plurality of legs 155, respectively, can be formed with the through hole 156.

[0167] The compression unit 200 can be provided inside the housing 110.

[0168] The compression unit 200 can include, for example, a cylinder 210 and a piston 230 reciprocating within the cylinder 210.

[0169] The cylinder 210 can be formed, for example, in a cylindrical shape open on both sides.

[0170] The cylinder 210 can be provided in the housing 110 in a longitudinal (length) direction, and the piston 230 can be provided in the cylinder 210 to reciprocate in the longitudinal direction of the housing 110.

[0171] The frame 250 can be provided outside the cylinder 210.

[0172] The frame 250 can include, for example, a body portion 252 surrounding the cylinder 210, and a flange portion 254 extending in a radial direction from one end portion (front end portion) of the body portion 252.

[0173] The cylinder 210 can be supported by the frame 250.

[0174] The cylinder 210 can be press-fitted to an inner surface of the body portion 252.

[0175] In this embodiment, the reciprocating direction of the piston 230 can refer to the same direction as the axial direction.

[0176] The driving unit 400 can be provided at one region (rear region) of the flange portion 254 in the axial direction.

[0177] The driving unit 400 can include, for example, a stator 410 and a mover 430 reciprocating with respect to the stator 410.

[0178] The stator 410 can include, for example, an outer stator 412 and an inner stator 414 provided concentrically with each other, and a stator coil 416 wound around the inner stator 414 and / or the outer stator 412. This embodiment illustrates a case where the stator coil 416 is provided at the inner side of the outer stator 412, but this is merely illustrative, and the disclosure is not limited thereto. The stator coil 416 can receive power by being electrically connected to the terminal 150.

[0179] The stator coil 416 can include a bobbin 4161 and a coil portion 4162 wound around the bobbin 4161. When power is applied, the coil portion 4162 generates a magnetic flux and interacts with a magnetic flux of a permanent magnet 432 to be explained later, so that the permanent magnet 432 (the mover 430) reciprocates in the axial direction.

[0180] The outer stator 412 and the inner stator 414 can be formed, for example, by laminating magnetic steel sheets in the circumferential direction in an insulating manner. In this embodiment, the outer stator 412 and the inner stator 414 can also be referred to as an outer stator core and an inner stator core.

[0181] The bobbin 4161 and the inner stator 414 can be spaced apart from each other in the radial direction.

[0182] The mover 430 can be disposed between the bobbin 4161 and the inner stator 414 so as to reciprocate in the axial direction.

[0183] The stator cover 440 can be coupled to a rear end portion of the stator 410.

[0184] A through portion 442 can be formed through the center of the stator cover 440, and the mover 430 can be coupled into the through portion 442.

[0185] The rear cover 450 can be coupled to a rear portion of the stator cover 440.

[0186] A front end portion of the rear cover 450 can be fixedly coupled to a rear end portion of the stator cover 440.

[0187] Resonance springs 460 that extend and contract in the axial direction can be disposed at a front portion of the rear cover 450.

[0188] The resonance springs 460 can be provided in a plurality.

[0189] The plurality of resonance springs 460 can include a first resonance spring 4601 and a second resonance spring 4602 spaced apart from each other in the axial direction.

[0190] A rear end portion of the second resonance spring 4602 can be in contact with the rear cover 450.

[0191] A front end portion of the first resonance spring 4601 can be in contact with a rear end portion of the mover 430.

[0192] A rear region of the compression unit 200 can be supported by a rear elastic support portion 470.

[0193] The rear elastic support portion 470 can be coupled to the rear cover 450. Accordingly, a rear end portion of the compression unit 200 can be cushioned and supported by the rear elastic support portion 470.

[0194] The rear elastic support portion 470 can be provided with a spring 471.

[0195] The spring 471 may, for example, be formed in a disc shape.

[0196] A plurality of coupling portions 472 can be formed at an outer edge of the spring 471.

[0197] The spring 471 can include a plurality of elastically deformable portions each of which extends spirally toward the center.

[0198] A central region of the spring 471 can be coupled to the suction guide 475.

[0199] The suction guide 475 can be fixedly coupled to the housing 110 (the rear cover 125).

[0200] A flow path through which gas (refrigerant) is suctioned can be defined to pass through the inside (center) of the suction guide 475 in the axial direction.

[0201] The flow path of the suction guide 475 can communicate with the suction pipe 130.

[0202] Gas introduced into the suction guide 475 through the gas suction pipe 130 can be accommodated in an accommodation space defined within the housing 110.

[0203] The piston 230 can be implemented in a cylindrical shape with one side closed.

[0204] The head 232 can be provided at one end portion (front end portion) of the piston 230. The head 232 can be provided with suction ports 234 through which refrigerant is suctioned. The head 232 can be provided with a suction valve 235 for opening and closing the suction ports 234. The suction valve 235 may, for example, have a central region coupled to the head 232 of the piston 230 by a fixing member 236. The suction valve 235 can be configured to open the suction ports 234 when the piston 230 moves to the bottom dead center and to close the suction ports 234 when the piston 230 moves to the top dead center.

[0205] The compression space 220 can be defined at one side of the cylinder 210.

[0206] In this embodiment, the compression space 220 can be defined in the front end portion of the cylinder 210.

[0207] A discharge valve 215 for selectively opening and closing the compression space 220 can be provided at the front end portion of the cylinder 210.

[0208] The discharge valve 215 can open and close, for example, a front end portion (front opening) of the cylinder 210. In this embodiment, the front opening of the cylinder 210 can be referred to as a discharge port 212 because the compressed gas is discharged when the discharge valve 215 is opened.

[0209] The discharge valve 215 can include, for example, a disc-shaped valve 217, and a discharge valve spring 218 elastically supporting the valve 217.

[0210] The discharge valve spring 218 can be provided with a plurality of elastically deformable portions formed in a disc shape and spirally extending from an outer edge toward a center. The plurality of elastically deformable portions can be elastically deformed in an axial direction.

[0211] A center of the discharge valve spring 218 can be coupled to the valve 217. Accordingly, the valve 217 can be elastically supported in an axial direction.

[0212] The discharge valve spring 218 can allow the valve 217 to be in contact with the front end portion of the cylinder 210 to close the front opening of the cylinder 210.

[0213] When an internal pressure of the compression space 220 of the cylinder 210 reaches a preset pressure, the discharge valve spring 218 can open the discharge port 212 (front opening) of the cylinder 210.

[0214] Here, an elastic force of the discharge valve spring 218 can be less than the preset pressure of the compression space 220. Accordingly, when the internal pressure of the compression space 220 reaches the preset pressure, the valve 217 can be elastically deformed in an axial direction in a direction away from the cylinder 210 to open the discharge port 212 so that the compressed refrigerant can be discharged through the discharge port 212.

[0215] Meanwhile, the suction muffler 260 can be provided at a rear region of the piston 230. For example, the suction muffler 260 can be formed in a substantially cylindrical shape. One end portion (front end portion) of the suction muffler 260 can be integrally coupled to a rear end portion of the piston 230. Accordingly, when the piston 230 reciprocates, the suction muffler 260 can also reciprocate.

[0216] An internal space of the suction muffler 260 can be divided into a plurality of spaces in an axial direction. The divided spaces can communicate with each other through a guide portion 264.

[0217] The discharge cover assembly 500 can be provided at a front portion of the compression space 220.

[0218] The discharge cover assembly 500 can include a discharge cover 510, and a first chamber 600 and a second chamber 700 both provided inside the discharge cover 510.

[0219] The front elastic support portion 300 can be provided at a front portion of the discharge cover assembly 500.

[0220] The front elastic support portion 300 can include a spring 310 coupled to the discharge cover 510.

[0221] The spring 310 can have a disc shape. An outer rim 314 of the spring 310 can be fixedly coupled to a fixing member 122 provided inside the housing 110. A fixing member 126 can be screwed into the outer rim 314 and the fixing member 122, such that the outer rim 314 and the fixing member 122 can be coupled to each other.

[0222] The spring 310 can include a plurality of elastically deformable portions spirally extending from the outer rim 314 toward a center. The center of the spring 310 can be coupled to a support guide 545 coupled to the discharge cover 510. Accordingly, a front region of the compression unit 200 can be elastically supported by the spring 310.

[0223] A movement guide 550 can be provided at the front region of the compression unit 200, for guiding movement of a front end portion (the discharge cover 510) of the compression unit 200.

[0224] The movement guide 550 can include, for example, an inner guide 551 connected to an end portion of the discharge cover 510, and an outer guide 552 provided outside the inner guide 551.

[0225] The inner guide 551 can be formed in a cap shape with one side open.

[0226] The outer guide 552 can be formed in a cap shape with one side open.

[0227] The inner guide 551 can be coupled to the support guide 545 such that an open end portion thereof faces a front direction. The inner guide 551 can be coupled to the support guide 545 by a fixing member 553. The present embodiment illustrates a case where the inner guide 551 is coupled to the support guide 545 and the support guide is coupled to the discharge cover 510, but this is merely illustrative, and the present application is not limited thereto.

[0228] The outer guide 552 can be coupled to a front end portion (the front cover 125) of the housing 110 such that an open end portion thereof faces a rear direction. The outer guide 552 can be, for example, welded on the cover 125.

[0229] With such a configuration, when the front region (the support guide 545) of the compression unit 200 moves excessively in a horizontal direction with respect to an axial direction (in a radial direction of the housing 110), an outer peripheral edge surface of the inner guide 551 can come into contact with an inner peripheral edge surface of the outer guide 552 to block the movement. Accordingly, excessive movement of the compression unit 200 in the radial direction with respect to the center of the housing 110 can be blocked.

[0230] Figure 3 is an exploded perspective view illustrating an exhaust cover assembly of Figure 2 , and Figure 4 is an exploded perspective view illustrating a frame and an exhaust cover assembly of Figure 2 . As shown in Figure 3 , the exhaust cover assembly 500 can include an exhaust cover 510, and a first chamber 600 and a second chamber 700, both of which are disposed inside the exhaust cover 510.

[0231] The exhaust cover 510 can define an inner space open on one side. One end portion (front end portion) of the exhaust cover 510 can be in contact with the frame 250.

[0232] The exhaust cover 510 can be provided with a flange portion 514 extending in an axial direction.

[0233] The flange portion 514 of the exhaust cover 510 can be in contact with the flange portion 254 of the frame 250.

[0234] The exhaust cover 510 (flange portion 514) can be provided with a plurality of coupling portions 515 to be coupled to the frame 250. A plurality of insertion holes 516 can be formed through the plurality of coupling portions 515, respectively, so that a plurality of coupling members (not shown) can be inserted.

[0235] A movement path 522 of a refrigerant (gas) serving as a gas bearing can be defined in the exhaust cover 510. An inclined portion 520 inclined with respect to the axial direction can be formed on an outer surface of the exhaust cover 510. The movement path 522 of the refrigerant can be defined in the inclined portion 520.

[0236] The first chamber 600 and the second chamber 700 can be coupled to the exhaust cover 510 in the axial direction.

[0237] The exhaust cover assembly 500 can be provided with a fixing ring 580.

[0238] The fixing ring 580 can be disposed between the first chamber 600 and the exhaust cover 510 in a radial direction. An inner surface of the fixing ring 580 can be in contact with an outer surface of the first chamber 600, and an outer surface of the fixing ring 580 can be in contact with an inner surface of the exhaust cover 510.

[0239] Accordingly, the first chamber 600 can be firmly fixed in the exhaust cover 510.

[0240] The exhaust cover assembly 500 can be provided with a damper 590.

[0241] The damper 590 can be implemented as a buffering member.

[0242] The damper 590 can be disposed axially between the first chamber 600 and the discharge valve 215.

[0243] More specifically, the damper 590 may be disposed axially between the first inner wall 6201 of the first chamber 600 (described later) and the discharge valve spring 218. Therefore, it is possible to prevent the vibration of the discharge valve spring 218 from being transmitted to the first chamber 600.

[0244] With this configuration, the discharge valve 215 can be connected to the first chamber 600, while the damper 590 is located between the discharge valve and the first chamber.

[0245] The first chamber 600 and the second chamber 700 can be connected to each other in the axial direction, and the first chamber 600 can be inserted into the discharge cover 510, while the retaining ring 580 is located between the first chamber and the discharge cover, thereby forming the discharge cover assembly 500.

[0246] like Figure 4 As shown, the flange portion 254 of the frame 250 may be provided with a discharge cover connecting portion 256, and the flange portion 514 of the discharge cover 510 is connected to the discharge cover connecting portion.

[0247] The discharge cap connecting portion 256 may be recessed to correspond to the shape of the flange portion 514 of the discharge cap 510, allowing the flange portion 514 of the discharge cap 510 to be inserted axially to a predetermined depth. The discharge cap connecting portion 256 may be provided with a plurality of connecting member connecting portions 257, to which connecting members inserted through the discharge cap 510 may be connected. The plurality of connecting member connecting portions 257 may have internal threads, into which the plurality of connecting members may be screwed respectively.

[0248] The flange portion 254 (discharge cap connection portion 256) may include a refrigerant movement path 290, which communicates with a refrigerant (gas) movement path 522 defined in the discharge cap 510. Therefore, the refrigerant in the discharge cap 510 can move to the frame 250 via the interconnected movement paths 522 and 290. The refrigerant movement path 290 defined in the flange portion 254 may extend into the body portion 252, and a refrigerant inlet 292 may be formed between the body portion 252 and the cylinder 210. A nozzle 294 for injecting refrigerant onto the inner surface of the cylinder 210 may be provided at the refrigerant inlet 292.

[0249] Figure 5 It is shown Figure 2 A view inside the exhaust cover, and Figure 6 It is shown Figure 5 An external view of the exhaust cover. (e.g.) Figure 5 to Figure 6As shown, the discharge cover 510 can be substantially formed in a cylindrical shape. The discharge cover 510 can include a discharge cover body 512 in a cylindrical shape. A side-opened accommodation space Sr can be defined in the discharge cover body 512. The discharge cover 510 can be made of, for example, an aluminum member. The discharge cover 510 can be formed of, for example, a synthetic resin member to prevent internal heat energy from being transferred to the outside.

[0250] Here, the refrigerant in the discharge space Sd in the discharge cover 510 can have a relatively high pressure and temperature because the refrigerant is discharged after being compressed in the compression space 220. On the other hand, the refrigerant in the housing 110 can have a relatively low pressure and temperature because the refrigerant has passed through an evaporator (not shown). When heat energy of the refrigerant in the discharge cover 510 is transferred to the refrigerant in the housing 110 at the outside of the discharge cover 510, the temperature of the refrigerant before being sucked into the compression space 220 can increase, which can decrease the compression efficiency (operational efficiency) of the compression unit 200.

[0251] In view of this, in the compressor of the present embodiment, the discharge cover assembly 500 can be configured such that the accommodation space Sr is defined in the discharge cover 510 and the first chamber 600 and the second chamber 700 are inserted into the accommodation space Sr of the discharge cover 510. Accordingly, heat energy of the compressed refrigerant discharged from the compression space 220 and moving along the inside of the discharge cover assembly 500 can be prevented from being transferred to the refrigerant in the housing 110 at the outside of the discharge cover assembly 500 (before being compressed). This can prevent the operational efficiency (compression efficiency) of the compressor from decreasing due to an increase in the temperature of the refrigerant before being compressed.

[0252] The accommodation space Sr can include, for example, a first accommodation space Sr1 in which the first chamber 600 is accommodated and a second accommodation space Sr2 in which the second chamber 700 is accommodated.

[0253] The first accommodation space Sr1 can be defined at the open side (rear region) of the discharge cover 510, and the second accommodation space Sr2 can be defined at the front region (far from the opening) of the first accommodation space Sr1.

[0254] The second accommodation space Sr2 can have a reduced inner diameter compared to the first accommodation space Sr1. The second chamber contact portion 523 can protrude in a radial direction from the inner surface of the discharge cover to closely contact the outer surface of the second chamber 700. A cut portion 524 can be formed on the second chamber contact portion 523 so that the outlet portion 720 (described later) of the second chamber 700 can be inserted.

[0255] A stepped portion 525 may be disposed in the second accommodating space Sr2, the stepped portion being stepped inward to correspond to the external shape of the second chamber 700.

[0256] The recessed portion 533 can be provided in the second accommodating space Sr2, and the recessed portion is recessed in one side (front side) along the axial direction.

[0257] An axially recessed discharge groove 530 may be formed in the stepped portion 525. A discharge hole 531 is formed through one side of the discharge groove 530, through which the interior and exterior of the discharge groove 530 communicate with each other. A movement path 522 is defined through the other side of the discharge groove 530, through which refrigerant (gas) will move to the cylinder 210. The inlet-side end portion of the refrigerant movement path 522 may communicate with the discharge groove 530, while its outlet-side end portion may be defined to pass through the flange portion 514.

[0258] like Figure 6 As shown, the protruding portion 535 can protrude axially from the outer center of the discharge cover 510. A recessed portion 533 can be defined within the protruding portion 535. A support guide connecting portion 540 can be formed in the protruding portion 535, to which the support guide 545 will be connected. The support guide connecting portion 540 can be recessed axially.

[0259] A discharge port 531 may be formed through one side of the protrusion 535. The discharge port 531 may communicate with one end portion of the return pipe 285, and the other end portion of the return pipe 285 may communicate with the discharge pipe 135. The return pipe 285 may have a structure that is bent multiple times. Therefore, vibrations of the discharge cover assembly 500 may be prevented from being transmitted to the discharge pipe 135.

[0260] Figure 7 It is shown Figure 2 External view of the first chamber. Figure 8 It is shown Figure 7 A view of the interior of the first chamber, while Figure 9 It is shown Figure 7 A cross-sectional view of the second discharge port region. (See diagram below.) Figure 7 and Figure 8 As shown, the first chamber 600 may be formed in a substantially cylindrical shape. The first chamber 600 may include a first chamber body 602 having a cylindrical shape. The first chamber 600 may be formed of, for example, an aluminum component. The first chamber 600 may be formed of, for example, a synthetic resin component to prevent heat transfer.

[0261] The discharge space Sd, which is connected to the compression space 220, can be confined within the first chamber 600 and the second chamber 700.

[0262] The first chamber 600 can include a coupling space 614 which is separated from the discharge space Sd and disposed outside the discharge space Sd.

[0263] The coupling space 614 can be formed to be open in the axial direction at one side (the upper side in the drawing, that is, the front side of the first chamber 600).

[0264] The first chamber 600 (the first chamber body 602) can include an outer wall 605 which is cylindrical, and an inner wall 620 which is located at the inner side of the outer wall 605 and is formed to be cylindrical.

[0265] The contact portion 610 can protrude in the radial direction from the outer surface of the outer wall 605 to be in close contact with the inner surface of the discharge cover 510. Thus, when the first chamber 600 is coupled into the discharge cover 510, the first chamber 600 and the discharge cover 510 can be firmly coupled in a close contact state with each other by the contact portion 610.

[0266] The contact portion 610 can include, for example, an annular portion 611 and a plurality of protruding portions 612 which protrude from the annular portion 611 in the axial direction and are spaced apart from each other in the circumferential direction.

[0267] The inner wall 620 can be disposed at the inner side of the outer wall 605 in a radially spaced apart manner.

[0268] The outer wall 605 and the inner wall 620 can be spaced apart from each other in the radial direction and disposed concentrically with each other.

[0269] The end portion of the outer wall 605 and the end portion of the inner wall 620 can be connected by a connecting portion 630. One end portion (the outer end portion) of the connecting portion 630 can be connected to the inner surface of the outer wall 605, and the other end portion (the inner end portion) can be connected to the outer surface of the inner wall 620.

[0270] The coupling space 614 can be defined between the outer wall 605 and the inner wall 620.

[0271] More specifically, the coupling space 614 can be defined as a space surrounded by the outer wall 605, the inner wall 620, and the connecting portion 630.

[0272] The coupling space 614 can be configured such that the area of the end portion (the front end portion of the outer wall 605) opposite the connecting portion 630 is open in the axial direction. The rear end portion of the second chamber 700 can be inserted (press-fitted) into the coupling space 614 by a predetermined depth through the opening thereof.

[0273] When the first chamber 600 is coupled with the second chamber 700, the front opening of the coupling space 614 can be blocked by the rear end portion of the second chamber 700. At this time, the rear end portion of the second chamber 700 can be inserted into the coupling space 614 in the axial direction by a depth of about half the length of the coupling space 614 (rather than the entire length of the coupling space 614).

[0274] In the present embodiment, in the coupling space 614, the space (region) remaining after the rear end portion of the second chamber 700 is inserted thereinto can define a movement passage 6142 through which the refrigerant moves.

[0275] Here, in the coupling space 614, the space (region) into which the rear end portion of the second chamber 700 is inserted can be referred to as an insertion portion 6141. That is, the coupling space 614 can include the insertion portion 6141 and the movement passage 6142.

[0276] The movement passage 6142 can communicate with the discharge space Sd through a communication portion 725 described later. Thus, the refrigerant in the discharge space Sd can move to the movement passage 6142 through the communication portion 725.

[0277] More specifically, the coupling space 614 can have a substantially rectangular cross section having a length in the axial direction from the front end portion of the outer wall 605 of the first chamber 600 to the connection portion 630, and a width (length) between the inner surface of the outer wall 605 and the outer surface of the inner wall 620 (the first inner wall 6201 described later).

[0278] The movement passage 6142 can have a rectangular cross section excluding the length (depth) from the inlet of the coupling space 614 to the end portion (rear end portion) of the second chamber 700 inserted in the axial direction.

[0279] The inner wall 620 can include a first inner wall 6201 disposed at the inner side of the outer wall 605, and a second inner wall 6202 protruding in the axial direction from the first inner wall 6201.

[0280] The first inner wall 6201 can be formed in a cylindrical shape open on one side (the lower side in the drawing, facing the cylinder 210). A first discharge space Sd1 can be defined at the inner side of the first inner wall 6201. The first discharge space Sd1 can communicate with the compression space 220.

[0281] The protruding portion 6211 can protrude rearward from the center of the first inner wall 6201 in the axial direction.

[0282] The first discharge space Sd1 can be defined as a pipe shape between the inner surface of the first inner wall 6201 and the outer surface of the protruding portion 6211.

[0283] A space portion 6213 can be defined inside the protruding portion 6211. The space portion 6213 can be open to the front. The space portion 6213 can communicate with a second discharge space Sd2 defined at the inner side of the second inner wall 6202.

[0284] More specifically, the second discharge space Sd2 can include all of the space defined at the inner side of the second inner wall 6202, the space portion 6213 defined inside the protruding portion 6211, and a space of the recessed portion 707 of the second chamber 700 to be described later.

[0285] The discharge valve spring 218 can be coupled to the protruding portion 6211.

[0286] The first outlet hole 631 can be formed through the first inner wall 6201 (the protruding portion 6211) so that the refrigerant can be discharged. The first outlet hole 631 can be provided as a plurality of holes. The present embodiment illustrates a case where the plurality of first outlet holes 631 are four, but this is merely illustrative, and the present disclosure is not limited thereto.

[0287] The second inner wall 6202 can have a substantially cylindrical shape.

[0288] The second inner wall 6202 can have an outer diameter that is reduced compared to the outer diameter of the first inner wall 6201.

[0289] The second inner wall 6202 can have an open front end portion.

[0290] When the second chamber 700 is coupled, the front end portion of the second inner wall 6202 can be in close contact with the inner surface of the second chamber 700.

[0291] The second discharge space Sd2 can be defined at the inner side of the second inner wall 6202. The second discharge space Sd2 can communicate with the first discharge space Sd1. The second discharge space Sd2 can communicate with the first discharge space Sd1 through the first outlet hole 631. Accordingly, the refrigerant in the first discharge space Sd1 can flow to the second discharge space Sd2 through the first outlet hole 631.

[0292] The second inner wall 6202 can include an arched segment 62021, for example, in an arched shape, and a straight segment 62022 in a straight line shape. The straight segment 62022 can be coupled to a side portion 711 formed in an axial direction on one side of a protruding portion 710 of the second chamber 700 to be described later. Accordingly, the second chamber 700 and the first chamber 600 can be coupled to each other at an accurate assembly position.

[0293] The first chamber 600 may include outflow guides 625 that project radially from the outer surface of the second inner wall 6202. The outflow guides 625 may, for example, be implemented as a pair spaced apart from each other along the periphery of the first chamber 600. When the second chamber 700 is coupled, the outer end portions of the outflow guides 625 in the radial direction of the first chamber 600 may contact the inner surface of the second chamber 700. The end portions of the outflow guides 625 ( Figure 7 The upper part of the middle section can contact the inner surface of the second chamber 700.

[0294] The third discharge space Sd3 can be confined to the inside of the outflow guide 625.

[0295] The fourth discharge space Sd4 can be confined to the outside of the outflow guide 625.

[0296] Here, the inner side of the outflow guide 625 can refer to the space corresponding to the closest distance between the two outflow guides 625 in the peripheral direction of the first chamber 600. The outer side of the outflow guide 625 can refer to the space corresponding to the farthest distance between the two outflow guides 625 in the peripheral direction of the first chamber 600.

[0297] The third discharge space Sd3 can be separated from the fourth discharge space Sd4 by the outflow guide 625 and the inner surface of the second chamber 700.

[0298] More specifically, when the second chamber 700 and the first chamber 600 are connected to each other, the outflow guide 625 can contact the inner surface of the second chamber 700, such that the third discharge space Sd3 can be defined between a region in the second chamber 700 and the inner side of the outflow guide 625, and the fourth discharge space Sd4 can be defined between another region in the second chamber 700 and the outer side of the outflow guide 625.

[0299] The third emission space Sd3 can be connected to the second emission space Sd2.

[0300] The second outlet hole 632 can be provided at the second inner wall 6202, so that the second discharge space Sd2 and the third discharge space Sd3 can communicate with each other.

[0301] like Figure 9 As shown, the second outlet hole 632 can be formed to pass through the second inner wall 6202. Here, the cross-sectional area of ​​the second outlet hole 632 can, for example, be the same as the cross-sectional area of ​​the moving channel 6142. Moreover, the cross-sectional area of ​​the second outlet hole 632 can, for example, be the same as the sum of the cross-sectional areas of the first outlet hole 631. This configuration can prevent refrigerant flow resistance caused by differences in the flow cross-sectional area of ​​the refrigerant during refrigerant movement.

[0302] Meanwhile, the rib 615 can be provided inside the coupling space 614 of the first chamber 600.

[0303] The rib 615 can block the movement passage 6142, for example.

[0304] One end portion (lower end portion in the drawing) of the rib 615 can be connected to the connection portion 630. The outer surface of the rib 615 in the radial direction of the first chamber 600 can be connected to the outer wall 605, and the inner surface of the rib 615 can be connected to the inner wall 620. The other end portion (upper end portion in the drawing) of the rib 615 can be in contact with an end portion of the second chamber 700. Accordingly, the refrigerant in the movement passage 6142 can move in only one direction without passing through the rib 615.

[0305] Figure 10 is a view showing the outside of the second chamber of Figure 2 , and Figure 11 is a view showing the inside of the second chamber of Figure 10 . As shown in Figure 10 and Figure 11 , the second chamber 700 can be substantially formed in a cylindrical shape. The second chamber 700 can include a second chamber body 702 having a cylindrical shape. The second chamber body 702 can have an accommodation space therein. The second chamber 700 can be formed of, for example, an aluminum member. The second chamber 700 can be formed of, for example, a synthetic resin member to block internal heat energy to the outside.

[0306] The second chamber 700 can have a cylindrical shape with one side closed.

[0307] The outer diameter of the second chamber 700 can be slightly smaller than the maximum outer diameter of the first chamber 600.

[0308] The second chamber 700 can be inserted into the coupling space 614 in the axial direction. The second chamber 700 can be press-fitted to the coupling space 614.

[0309] More specifically, the outer peripheral surface of the second chamber 700 can be in contact with the inner peripheral surface of the outer wall 605 of the first chamber 600, and the inner peripheral surface of the second chamber 700 can be in contact with the outer peripheral surface of the inner wall 620 of the first chamber 600.

[0310] The second chamber body 702 can include a cylindrical portion 703 in a cylindrical shape, and a blocking portion 705 blocking one end portion (front end portion) of the cylindrical portion 703.

[0311] The recessed portion 707 can project outward from the center of the blocking portion 705 in the axial direction and have a recessed inner portion. The recessed portion 707 can constitute a part of the second discharge space Sd2. The recessed portion 707 can be substantially cylindrical. The recessed portion 707 can have an inclined surface 708 inclined in the axial direction. The inclined surface 708 can be provided at one region of the recessed portion in the circumferential direction.

[0312] The second chamber 700 can include a protruding portion 710, which is a portion of the blocking portion 705 projecting inward (rearward) in the axial direction. A side portion 711 can be at one side in the axial direction of the protruding portion 710.

[0313] One end portion (rear end portion) of the cylindrical portion 703 of the second chamber 700 can be inserted into the coupling space 614 of the first chamber 600 by a predetermined depth.

[0314] On the circumferential surface of the cylindrical portion 703, an outlet portion 720 can radially project from the outside of the protruding portion 710.

[0315] The outlet portion 720 can extend in the axial direction.

[0316] The outlet portion 720 can communicate with the discharge groove 530 of the discharge cap 510. When the second chamber 700 is inserted into the discharge cap 510, an end portion of the outlet portion 720 can be inserted into the discharge groove 530 of the discharge cap 510.

[0317] An outlet groove 722 can be formed through the outlet portion 720 in the axial direction. An inner end portion of the outlet groove 722 can open inward through the inner surface of the cylindrical portion 703. Thus, the refrigerant in the fourth discharge space within the second chamber 700 can move to the discharge groove 530 of the discharge cap 510 along the outlet groove 722.

[0318] The second chamber 700 can include a communication portion 725 through which the discharge space Sd communicates with the movement passage 6142. The communication portion 725 can be formed by, for example, cutting the rear end portion of the cylindrical portion 703 of the second chamber 700 in the axial direction.

[0319] The communication portion 725 can include an inlet 726 and an outlet 727 spaced apart from the rib 615, the rib 615 being located between the inlet and the outlet. A movement path of the refrigerant having a long length from the inlet 726 provided at one side adjacent to the rib 615 to the outlet 727 provided at the other side adjacent to the rib 615 can be defined in the circumferential direction.

[0320] The inlet 726 and the outlet 727 can be formed by cutting an end portion (the cylindrical portion 703) of the second chamber 700 in the axial direction by a predetermined length. Here, when the cylindrical portion 703 of the second chamber 700 is inserted into the coupling space 614 of the first chamber 600, a rear region of the inlet 726 and a rear region of the outlet 727 can be inserted into the coupling space 614 of the first chamber 600 to communicate with the movement passage 6142, respectively.

[0321] A front region of the inlet 726 can be disposed in the third discharge space Sd3.

[0322] A front region of the outlet 727 can be disposed in the fourth discharge space Sd4.

[0323] The present embodiment illustrates a case where the inlet 726 and the outlet 727 are formed so as to pass through the cylindrical portion 703, but this is merely illustrative and not limited thereto. Alternatively, the inlet 726 and the outlet 727 can be formed in a groove shape that is recessed in the inner surface of the cylindrical portion 703 in the radial direction, respectively.

[0324] When the second chamber 700 is inserted into the discharge cover 510, the outer surface of the inlet 726 and the outer surface of the outlet 727 can be blocked by the inner surface of the discharge cover 510.

[0325] The inlet 726 and the outlet 727 can be positioned adjacent to the rib 615.

[0326] Therefore, a movement path of the refrigerant flowing along the inlet 726, the movement passage 6142, and the outlet 727 can have a relatively long length.

[0327] With this configuration, when the refrigerant in the third discharge space Sd3 moves along the inlet 726, the movement passage 6242, and the outlet 727, the acoustic equivalent mass can be significantly increased.

[0328] The inlet 726 can communicate with the third discharge space Sd3.

[0329] Therefore, the refrigerant in the third discharge space Sd3 can be introduced into the movement passage 6142 through the inlet 726.

[0330] The outlet 727 can communicate with the fourth discharge space Sd4.

[0331] Therefore, the refrigerant moving along the movement passage 6142 can flow into the fourth discharge space Sd4 through the outlet 727.

[0332] Here, the cross-sectional area of the inlet 726 and the cross-sectional area of the outlet 727 can be substantially the same as the flow cross-sectional area of the movement passage 6142.

[0333] This makes it possible to prevent the flow resistance of the refrigerant from increasing due to a difference in flow cross-sectional area during movement of the refrigerant.

[0334] Figure 12 is an enlarged view of a coupling region between the first chamber and the second chamber of Figure 2 , Figure 13 is a plan cross-sectional view of a rib region of Figure 12 , Figure 14 is a plan cross-sectional view of a coupling region between the first chamber and the second chamber of Figure 12 , and Figure 15 is a view showing movement of the refrigerant along a movement passage of Figure 14 . As shown in Figure 12 , the rear end portion of the second chamber 700 can be inserted into the front end portion of the first chamber 600 by a predetermined depth in the axial direction.

[0335] The rear end portion of the second chamber 700 can be in contact with the front end portion (upper end portion in the drawing) of the rib 615.

[0336] As shown in Figure 13 , the movement passage 6142 can be defined at both sides of the rib 615.

[0337] As shown in Figure 14 , the inlet 726 can be provided at one side of the rib 615, and the outlet 727 can be provided at the other side of the rib 615.

[0338] As shown in Figure 15 , with this configuration, the refrigerant in the third discharge space Sd3 can be introduced into one end portion of the movement passage 6142 through the inlet 726, and moved along the movement passage 6142 in one direction (clockwise direction in the drawing) of the circumferential direction. The refrigerant moved along the movement passage 6142 can be moved to the fourth discharge space Sd4 through the outlet 727.

[0339] Figure 16 is a view showing movement of the refrigerant in the discharge cover of Figure 2 , and Figure 17 is a simplified view showing movement of the refrigerant in the discharge cover of Figure 16 .

[0340] Hereinafter, the suction, compression, and discharge strokes of the refrigerant in the compressor according to the embodiment will be described with reference to Figure 2 , Figure 16 , and Figure 17 .

[0341] When electric power is applied to the stator coil 416, the magnetic field generated by the stator coil 416 and the magnetic field generated by the permanent magnet 432 interact, so that the mover 430 can reciprocate in the axial direction.

[0342] When piston 230 moves to bottom dead center, suction valve 235 opens suction port 234, allowing refrigerant in piston 230 to move into compression space 220 through suction port 234.

[0343] When piston 230 moves to top dead center, suction valve 235 closes suction port 234. In response, refrigerant in compression chamber 220 can be compressed. When the internal pressure of compression chamber 220 reaches a preset pressure, discharge valve 218 opens discharge port 212, and thus the refrigerant compressed in compression chamber 220 can be discharged into first discharge chamber Sd1.

[0344] like Figure 16 As shown, the refrigerant in the first discharge space Sd1 can move to the second discharge space Sd2 through multiple first outlet holes 631. The refrigerant in the second discharge space Sd2 can move to the third discharge space Sd3 through the second outlet hole 632. The refrigerant in the third discharge space Sd3 can move to the moving channel 6142 through the inlet 726 and to the fourth discharge space Sd4 through the outlet 727.

[0345] The refrigerant that moves to the fourth discharge space Sd4 can move along the outlet groove 722 to the discharge groove 530.

[0346] like Figure 17 As shown, the refrigerant moving (expanding) from the compression space 220 to the first discharge space Sd1 is compressed as it passes through multiple first outlet holes 631, and then expands as it moves to the second discharge space Sd2. The refrigerant in the second discharge space Sd2 is compressed as it passes through the second outlet hole 632, and expands as it moves to the third discharge space Sd3. The refrigerant in the third discharge space Sd3 is compressed as it moves along the inlet 726, the movement channel 6142, and the outlet 727. At this time, the refrigerant in the third discharge space Sd3 is compressed and moves a relatively long distance along the inlet 726, the movement channel 6142, and the outlet 727, thereby significantly increasing the acoustic equivalent mass. Therefore, pulsation can be significantly reduced and noise generation can be significantly reduced. The refrigerant moving through the outlet 727 expands in the fourth discharge space Sd4. The refrigerant in the fourth discharge space Sd4 can move to the discharge recess 530 through the outlet recess 722.

[0347] A portion of the refrigerant that moves into the discharge recess 530 can be discharged outside the housing 110 via the discharge pipe 135 and the loop pipe 285 connected to the discharge recess 530.

[0348] Another portion of the refrigerant moving into the discharge recess 530 can move along gas moving paths 522 and 290 defined in the discharge cover 510 and the frame 250 into the refrigerant inlet 292. The refrigerant introduced into the refrigerant inlet 292 can be injected into a gap between an inner peripheral surface of the cylinder 210 and an outer peripheral surface of the piston 230 through a nozzle 294 communicating with the inside of the cylinder 210. Accordingly, friction between the inner peripheral surface of the cylinder 210 and the outer peripheral surface of the piston 230 can be reduced.

[0349] In the compressor according to the present embodiment, the refrigerant compressed in the compression space 220 can repeatedly expand and compress while passing through the plurality of discharge spaces Sd and the plurality of outlet holes 631 and 632, thereby reducing pulsation. In particular, when the refrigerant passes through the moving passage 6142 having a length greater than its width (flow cross-sectional area), the acoustic equivalent mass can significantly increase and thus the pulsation can significantly reduce. This can significantly reduce noise caused by the pulsation.

[0350] Further, in the compressor according to the present embodiment, the plurality of discharge spaces Sd and the outlet holes 631 and 632 can be provided in the second chamber 700 and the first chamber 600 coupled to the inside of the discharge cover 510. Accordingly, it is possible to prevent heat energy of the compressed refrigerant at a high temperature from being transferred to the outside of the discharge cover 510.

[0351] In consideration of this, when the discharge cover 510, the first chamber 600, and the second chamber 700 are formed of a synthetic resin member having a relatively low heat transfer coefficient, it is possible to further prevent heat energy of the compressed refrigerant from being transferred to the outside of the discharge cover 510.

[0352] Figure 18 is a perspective view illustrating a state before the first chamber and the second chamber of the compressor according to another embodiment are coupled, and Figure 19 is a perspective view illustrating a state in which the first chamber and the second chamber of the compressor according to another embodiment are coupled, and Figure 18 is a cross-sectional view of a second discharge hole region of the first chamber of FIG. 11. As described above, the compressor according to the present embodiment can include a housing 110, a compression unit 200, and a driving unit 400.

[0353] The driving unit 400 can include, for example, a stator 410 and a mover 430 reciprocating with respect to the stator 410.

[0354] The compression unit 200 can include, for example, a cylinder 210 defining a compression space 220 and a piston 230 reciprocating in an axial direction with respect to the cylinder 210.

[0355] The compression unit 200 can include a frame 250 provided at an outer side of the cylinder 210.

[0356] The compression unit 200 may include a discharge cover 510, which is disposed on one side (front side) of the cylinder 210 to cover the compression space 220.

[0357] like Figure 18 As shown, the discharge cover 510 may include a first chamber 600a and a second chamber 700a, the first chamber and the second chamber defining a plurality of discharge spaces Sd communicating with the compression space 220.

[0358] The first chamber 600a and the second chamber 700a can be connected to each other in the axial direction.

[0359] The first chamber 600a may include a connecting space 614, and the first chamber 600a is connected to the connecting space.

[0360] The first chamber 600a may include an outer wall 605 and an inner wall 620 concentrically disposed with respect to the outer wall 605, to jointly define the connecting space 614.

[0361] The inner wall 620 may include a first inner wall 6201 disposed radially inside the outer wall 605, and a second inner wall 6202 protruding axially from the first inner wall 6201.

[0362] The second inner wall 6202 may include an arched segment 62021 and a straight segment 62022, the straight segment 62022 being linearly connected to the two ends of the arched segment 62021.

[0363] like Figure 19 As shown, the connection space 614 can be defined between the outer wall 605 and the inner wall 620 (first inner wall 6201). The connection space 614 can be formed to be open on one side (the upper side in the figure, i.e. the front side of the first chamber 600a).

[0364] The protruding portion 6211 may protrude axially from the center of the first inner wall 6201. The spatial portion 6213 may be confined within the protruding portion 6211.

[0365] The first emission space Sd1 can be confined to the inside of the first inner wall 6201.

[0366] The second emission space Sd2 can be confined to the inside of the second inner wall 6202.

[0367] The first outlet hole 631 may be formed to pass through the first inner wall 6201, so that the refrigerant in the first discharge space Sd1 can flow to the second discharge space Sd2. Multiple first outlet holes 631 may be provided.

[0368] Meanwhile, the first chamber 600a can include an outflow guide 625 protruding in a radial direction from the second inner wall 6202. The outflow guide 625 can be provided as a pair of outflow guides spaced apart in a circumferential direction.

[0369] A third discharge space Sd3 can be defined at an inner side of the outflow guide 625.

[0370] A fourth discharge space Sd4 can be defined at an outer side of the outflow guide 625.

[0371] A second outlet hole 632 can be provided at the second inner wall 6202 so that the refrigerant in the second discharge space Sd2 can flow outward. The second outlet hole 632 can be formed through the second inner wall 6202.

[0372] The second outlet hole 632 can be formed so that the second discharge space Sd2 and the third discharge space Sd3 can communicate with each other. The second outlet hole 632 can be formed through the second inner wall 6202 between the outflow guides 625 in a circumferential direction. Thus, the refrigerant in the second discharge space Sd2 can move to the third discharge space Sd3.

[0373] Meanwhile, when the second chamber 700a is coupled, a movement passage 6142 can be defined in the coupling space 614 of the first chamber 600a.

[0374] The movement passage 6142 can be defined by the outer wall 605, the inner wall 620, and the connection portion 630 of the first chamber 600a, and an end portion (a rear end portion) of the second chamber 700a that blocks an entrance of the coupling space 614.

[0375] A rib 615 for dividing the movement passage 6142 can be provided in the coupling space 614.

[0376] Thus, the refrigerant can move in one direction (a direction not passing through the rib 615) in the movement passage 6142.

[0377] The rib 615 can include, for example, a first rib 6151 and a second rib 6152, dividing the movement passage 6142 into two passages, i.e., a first movement passage 61421 and a second movement passage 61422.

[0378] The first rib 6151 can be provided, for example, at a region corresponding to the third discharge space Sd3.

[0379] More specifically, the first rib 6151 can be provided between an extension line extending in a radial direction from the outflow guide 625 and an extension line extending in an axial direction to partition (divide) the coupling space 614.

[0380] The second rib 6152 can be positioned at an inner point of the coupling space 614 (the movement passage 6142), corresponding to the same length as the first rib 6151 in both directions.

[0381] Accordingly, the first movement passage 61421 and the second movement passage 61422, which are divided by the first rib 6151 and the second rib 6152, can have the same length.

[0382] The second rib 6152 can be configured to be rotationally symmetrical with the first rib 6151 with respect to the center of the first chamber 600a, for example.

[0383] Meanwhile, the second chamber 700a can have a substantially cylindrical shape. A protruding portion 710 can protrude inward from the second chamber 700a in an axial direction. A side portion 711 disposed at one side of the protruding portion 710 in the axial direction can face or contact the straight section 62022 of the first chamber 600a.

[0384] The second chamber 700a can include a cylindrical portion 703 which is inserted into the coupling space 614 by a predetermined depth.

[0385] An outlet portion 720 can protrude in a radial direction from one side of the cylindrical portion 703. An outlet recess 722 can be provided in the outlet portion 720 to communicate with the fourth discharge space Sd4. The outlet recess 722 can communicate with the discharge recess 530 of the discharge cover 510.

[0386] Accordingly, the fourth discharge space Sd4 and the inner space of the discharge recess 530 can communicate with each other.

[0387] The second chamber 700a (the cylindrical portion 703) can include an inlet 726 through which the third discharge space Sd3 communicates with the movement passage 6142.

[0388] The inlet 726 can include a first inlet 7261 through which the third discharge space Sd3 and the first movement passage 61421 communicate with each other, and a second inlet 7262 through which the third discharge space Sd3 and the second movement passage 61422 communicate with each other.

[0389] The first inlet 7261 and the second inlet 7262 can be spaced apart from each other by the first rib 6151 provided therebetween.

[0390] The first inlet 7261 and the second inlet 7262 can be formed at positions at which the inlets can communicate with the third discharge space.

[0391] The second chamber 700a (the cylindrical portion 703) can include an outlet 727 which communicates with the first movement passage 61421.

[0392] The outlet 727 may include a first outlet 7271 and a second outlet 7272. The first moving channel 61421 and the fourth emission space Sd4 are connected to each other through the first outlet, and the second moving channel 61422 and the fourth emission space Sd4 are connected to each other through the second outlet.

[0393] The first outlet 7271 and the second outlet 7272 can be separated from each other by means of a second rib 6152 disposed between them.

[0394] Figure 20 It is shown Figure 18 A cross-sectional view of the connection region between the first and second chambers. (See figure) Figure 20 As shown, when the second chamber 700a is connected to block the entrance of the connection space 614 of the first chamber 600a, the lower end portion (rear end portion) of the second chamber 700a can contact the end portion of the first rib 6151 and the end portion of the second rib 6152.

[0395] The first moving channel 61421 and the second moving channel 61422, which are separated from each other, can be defined on both sides between the first rib 6151 and the second rib 6152, respectively.

[0396] Figure 21 It is shown Figure 20 A planar cross-sectional view of the connection area between the first chamber and the second chamber. Figure 22 It shows along Figure 21 A view of refrigerant movement in the moving channel, and Figure 23 It is shown Figure 17 A simplified diagram showing the movement of refrigerant within the discharge cap. (See diagram for example.) Figure 21 As shown, the outer end portion of the outflow guide 625 can contact the inner wall 620 of the second chamber 700a. The second discharge space Sd2 can be defined inside the first chamber 600a, and the third discharge space Sd3 can be defined between each outflow guide 625 (on its inner side). The fourth discharge space Sd4 can be defined on the outer side of the outflow guide 625.

[0397] The first rib 6151 may be disposed in the movement channel 6142 corresponding to the third exhaust space Sd3, and the second rib 6152 may be disposed on the opposite side (180 degrees) of the first rib 6151.

[0398] Therefore, the first moving channel 61421 and the second moving channel 61422 can be defined between the first rib 6151 and the second rib 6152.

[0399] The first entrance 7261 can be connected to the first moving channel 61421, and the second entrance 7262 can be connected to the second moving channel 61422.

[0400] The first exit 7271 can be connected to the first moving channel 61421, and the second exit 7272 can be connected to the second moving channel 61422.

[0401] like Figure 22 and Figure 23 As shown, with this configuration, refrigerant discharged from the compression space 220 to the first discharge space Sd1 can move to the second discharge space Sd2 through the first outlet hole 631, and refrigerant in the second discharge space Sd2 can move to the third discharge space Sd3 through the second outlet hole 632.

[0402] A portion of the refrigerant in the third emission space Sd3 can be introduced into the first moving channel 61421 through the first inlet 7261. The refrigerant moving along the first moving channel 61421 can be introduced into the fourth emission space Sd4 through the first outlet 7271.

[0403] Another portion of the refrigerant in the third discharge space Sd3 can be introduced into the second moving channel 61422 through the second inlet 7262. The refrigerant moving along the second moving channel 61422 can be introduced into the fourth discharge space Sd4 through the second outlet 7272.

[0404] The refrigerant in the fourth discharge space Sd4 can move along the outlet groove 722 to the discharge groove 530 of the discharge cover 510.

[0405] A portion of the refrigerant that moves into the discharge recess 530 can be discharged outside the housing 110 via the discharge pipe 135 and the return pipe 285.

[0406] Another portion of the refrigerant moving to the discharge recess 530 can move along a gas movement path defined in the discharge cover 510, frame 250, and cylinder 210, so as to be injected through the nozzle of cylinder 210 into the gap between the inner peripheral surface of cylinder 210 and the outer peripheral surface of piston 230. Therefore, the friction between cylinder 210 and piston 230 can be reduced.

[0407] In the compressor according to this embodiment, the refrigerant can move (expand) from the compression space 220 to the first discharge space Sd1, be compressed as it passes through the first outlet orifice 631, and then expand to the second discharge space Sd2. The refrigerant in the second discharge space Sd2 can be compressed as it passes through the second outlet orifice 632, and then expand in the third discharge space Sd3. Through this repeated compression and expansion, pulsation can be reduced.

[0408] A portion of the refrigerant in the third emission space Sd3 is movable through the first inlet 7261, the first moving channel 61421, and the first outlet 7271. During this movement, the acoustic equivalent mass can be significantly increased.

[0409] Another portion of the refrigerant in the third discharge space Sd3 can move through the second inlet 7262, the second movement passage 61422, and the second outlet 7272. During the movement, the acoustic equivalent mass can be significantly increased. Accordingly, the pulsation can be significantly mitigated and the noise generation can be significantly reduced. The refrigerant moving through the first outlet 7171 and the refrigerant moving through the second outlet 7272 can each expand in the fourth discharge space Sd4.

[0410] Figure 24 is a perspective view illustrating a state before the first chamber and the second chamber of a compressor according to still another embodiment are coupled, and Figure 25 is a plan cross-sectional view illustrating a coupling region between the first chamber and the second chamber of Figure 24 . As described above, the compressor according to the present embodiment can include a housing 110, a compression unit 200, and a driving unit 400.

[0411] The driving unit 400 can include, for example, a stator 410 and a mover 430 reciprocating with respect to the stator 410.

[0412] The compression unit 200 can include, for example, a cylinder 210 defining a compression space 220, and a piston 230 reciprocating in an axial direction with respect to the cylinder 210.

[0413] The compression unit 200 can include a frame 250 disposed at an outer side of the cylinder 210.

[0414] The compression unit 200 can include a discharge cover 510 disposed on a side (front side) of the cylinder 210 to cover the compression space 220.

[0415] As shown in Figure 24 , the discharge cover 510 can include a first chamber 600b and a second chamber 700b defining a plurality of discharge spaces Sd communicating with the compression space 220.

[0416] The first chamber 600b and the second chamber 700b can be coupled to each other in the axial direction. The first chamber 600b can include a coupling space 614 to which the first chamber 600b is coupled. The first chamber 600b can include an outer wall 605 and an inner wall 620 disposed concentrically with the outer wall 605 to collectively define the coupling space 614.

[0417] The inner wall 620 can include a first inner wall 6201 disposed at the inner side of the outer wall 605 in the radial direction, and a second inner wall 6202 protruding from the first inner wall 6201 in the axial direction. The second inner wall 6202 can include an arched segment 62021 and a straight segment 62022 linearly connecting both ends of the arched segment 62021.

[0418] A coupling space 614 can be defined between the outer wall 605 and the inner wall 620. The coupling space 614 can be defined to be open at one side (the upper side in the drawing, i.e., the front side of the first chamber 600b). A first discharge space Sd1 can be defined at the inner side of the first inner wall 6201. A second discharge space Sd2 can be defined at the inner side of the second inner wall 6202.

[0419] The first chamber 600b can include an outflow guide 625 protruding from the second inner wall 6202 in the radial direction. The outflow guide 625 can be provided as a pair of outflow guides spaced apart in the circumferential direction. A third discharge space Sd3 can be defined at the inner side of the outflow guide 625. A fourth discharge space Sd4 can be defined at the outer side of the outflow guide 625.

[0420] Meanwhile, the first chamber 600b can include a division guide 626 that divides the discharge space Sd3 divided by the outflow guide 625 into two spaces.

[0421] Accordingly, the third discharge space Sd3 at the inner side of the outflow guide 625 can be divided into a first partial discharge space Sd31 and a second partial discharge space Sd32.

[0422] Here, the division guide 626 can be disposed at the center between the respective outflow guides 625 in the circumferential direction.

[0423] Accordingly, the first partial discharge space Sd31 and the second partial discharge space Sd32 can have substantially the same volume.

[0424] When the second chamber 700b is coupled, the outer end portion of the division guide 626 can be in contact with the inner surface of the second chamber 700b.

[0425] A first partial outlet hole 6321 can be formed through the second inner wall 6202 so that the refrigerant in the second discharge space Sd2 can flow into the first partial discharge space Sd31.

[0426] A second partial outlet hole 6322 can be formed through the second inner wall 6202 so that the refrigerant in the second discharge space Sd2 can flow into the second partial discharge space Sd32.

[0427] Here, the cross-sectional area of the first partial outlet hole 6321 can be substantially the same as the cross-sectional area of the second partial outlet hole 6322.

[0428] Meanwhile, when the second chamber 700b is coupled, the movement passage 6142 can be defined in the coupling space 614 of the first chamber 600b.

[0429] The movement passage 6142 can be defined by the outer wall 605, the inner wall 620, and the connection portion 630 of the first chamber 600b, and the end portion (rear end portion) of the second chamber 700b blocks the inlet of the coupling space 614.

[0430] A rib 615 for dividing the movement passage 6142 can be provided in the coupling space 614. Accordingly, the refrigerant can move in one direction (a direction not passing through the rib 615) along the movement passage 6142.

[0431] The rib 615 can include, for example, a first rib 6151 and a second rib 6152, which divide the movement passage 6142 into a first movement passage 61421 and a second movement passage 61422.

[0432] The first rib 6151 can be provided, for example, at a region corresponding to the third discharge space Sd3.

[0433] More specifically, the first rib 6151 can be provided on an extension line extending in an axial direction of a division line extending radially from the division guide 626 to divide the coupling space 614.

[0434] The second rib 6152 can be positioned at an inner point of the coupling space 614 (the movement passage 6142), corresponding to a same length apart from the first rib 6151 in both directions.

[0435] Accordingly, the first movement passage 61421 and the second movement passage 61422 divided by the first rib 6151 and the second rib 6152 can have the same length.

[0436] The second rib 6152 can be configured to be, for example, rotationally symmetrical with respect to the first rib 6151 from the center of the first chamber 600b.

[0437] The second rib 6152 can be provided at the center of an extension line connecting the center of the first rib 6151 and the center of the first chamber 600b.

[0438] The second chamber 700b (the cylindrical portion 703) can include a first inlet 7261 through which the first partial discharge space Sd31 communicates with the first movement passage 61421.

[0439] The cross-sectional area of the first inlet 7261 can be substantially the same as the cross-sectional area of the first partial outlet hole 6321, for example.

[0440] The second chamber 700b (cylindrical portion 703) can include a second inlet 7262 through which the second partial discharge space Sd32 communicates with the second moving passage 61422.

[0441] The cross-sectional area of the second inlet 7262 can be substantially the same as the cross-sectional area of the second partial outlet hole 6322, for example.

[0442] As shown in Figure 25 The first inlet 7261 and the second inlet 7262 can be spaced apart from each other by the first rib 6151 disposed therebetween.

[0443] The first inlet 7261 can communicate with the first partial discharge space Sd31.

[0444] The second inlet 7262 can communicate with the second partial discharge space Sd32.

[0445] The second chamber 700b (cylindrical portion 703) can include a first outlet 7271 that communicates with the first moving passage 61421.

[0446] The cross-sectional area of the first outlet 7271 can be substantially the same as the cross-sectional area of the first inlet 7261.

[0447] The second chamber 700b (cylindrical portion 703) can include a second outlet 7272 that communicates with the second moving passage 61422.

[0448] The cross-sectional area of the second outlet 7272 can be substantially the same as the cross-sectional area of the second inlet 7262.

[0449] The first outlet 7271 and the second outlet 7272 can be spaced apart from each other by the second rib 6152 disposed therebetween.

[0450] Both the first outlet 7271 and the second outlet 7272 can communicate with the fourth discharge space Sd4.

[0451] In this embodiment, the first partial outlet hole 6321, the first inlet 7261, the first moving passage 61421, and the first outlet 7271 can have substantially the same flow cross-sectional area.

[0452] In this embodiment, the second partial outlet hole 6322, the second inlet 7262, the second moving passage 61422, and the second outlet 7272 can have substantially the same flow cross-sectional area.

[0453] Figure 26 is a graph showing the pressure in the first chamber 700a (cylindrical portion 702)Figure 25 a view of the movement of the refrigerant of the moving passage, Figure 27 is a simplified diagram showing the movement of the refrigerant within the discharge cover. Figure 23 Figure 26 and Figure 27 As shown in FIGS. 17 and 18, the refrigerant that has been discharged from the compression space 220 and moved to the second discharge space Sd2 via the first discharge space Sd1 can be discharged into the first partial discharge space Sd31 and the second partial discharge space Sd32 through the first partial outlet hole 6321 and the second partial outlet hole 6322, respectively.

[0454] The refrigerant moved to the first partial discharge space Sd31 can move to the fourth discharge space Sd4 via the first inlet 7261, the first moving passage 61421, and the first outlet 7271.

[0455] The refrigerant moved to the second partial discharge space Sd32 can move to the fourth discharge space Sd4 via the second inlet 7262, the second moving passage 61422, and the second outlet 7272.

[0456] The refrigerant moved to the fourth discharge space Sd4 can move to the discharge recess 530 of the discharge cover 510 along the outlet groove 722.

[0457] A portion of the refrigerant moved to the discharge recess 530 can be discharged to the outside of the housing 110 via the circuit pipe 285 through the discharge pipe 135.

[0458] Another portion of the refrigerant moved to the discharge recess 530 can move along a gas moving path defined in the discharge cover 510, the frame 250, and the cylinder 210 so as to be injected into a gap between the inner peripheral surface of the cylinder 210 and the outer peripheral surface of the piston 230 through the nozzle of the cylinder 210. Accordingly, the friction between the cylinder 210 and the piston 230 can be reduced.

[0459] In the compressor according to the present embodiment, a portion of the refrigerant in the second discharge space Sd2 can be compressed when passing through the first partial outlet hole 6321 and expanded in the first partial discharge space Sd31. Another portion of the refrigerant in the second discharge space Sd2 can be compressed when passing through the second partial outlet hole 6322 and expanded in the second partial discharge space Sd32. During the compression and expansion, pulsation can be alleviated.

[0460] In particular, a portion of the refrigerant in the first partial discharge space Sd31 can move through the first inlet 7261, the first moving passage 61421, and the first outlet 7271. During the movement, the acoustic equivalent mass can be significantly increased.

[0461] ​Another portion of the refrigerant in the second partial discharge space Sd32 can move through the second inlet 7262, the second moving passage 61422, and the second outlet 7272. During the movement, the acoustic equivalent mass can significantly increase.

[0462] Accordingly, pulsation can be significantly reduced, and noise generation due to the pulsation can be significantly reduced.

[0463] The foregoing description of specific implementations of the present disclosure has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the present disclosure to the precise form disclosed, and various modifications and variations are possible in light of the above teachings. The implementations discussed above are not intended to be exhaustive or limit the present disclosure to the precise forms disclosed.

[0464] Moreover, any implementation described herein can be implemented to realize one or more of the advantages discussed above. Accordingly, the present disclosure is not to be taken as limited to all of the implementations described above, but rather, only as measured by the scope and equivalents of the claims themselves. Furthermore, embodiments that are not specifically described herein are also implicitly contemplated unless otherwise stated.

Claims

1. A compressor comprising: a housing; a compression unit provided inside the housing to compress a refrigerant; and a drive unit provided inside the housing to apply a driving force to the compression unit, wherein the compression unit includes: a cylinder in which a compression space is defined; a piston reciprocating inside the cylinder and changing the compression space; a discharge cover covering the compression space; and a first chamber and a second chamber each provided inside the discharge cover and in which a discharge space communicating with the compression space is defined, wherein the first chamber has a coupling space separated from the discharge space, the coupling space being defined at an outer side of the discharge space in a circumferential direction and one side thereof being open in an axial direction, the second chamber has an end portion blocking an opening of the coupling space in the axial direction when the second chamber is coupled, thereby defining a movement passage for movement of the refrigerant in the coupling space, a rib is provided inside the movement passage to block the movement passage, and a communication portion is included in the second chamber and includes an inlet and an outlet provided adjacent to the rib and spaced apart from each other, the discharge space and the movement passage communicating with each other through the communication portion, and wherein the refrigerant discharged from the compression space moves along the discharge space, the communication portion, and the movement passage. The rib is interposed between the inlet and the outlet in the circumferential direction.

2. The compressor of claim 1, wherein, The inlet, the outlet, and the movement passage have the same cross-sectional area.

3. The compressor of claim 2, wherein, The first chamber includes an outer wall and an inner wall provided concentrically, the coupling space being located between the outer wall and the inner wall, 4. The compressor of claim 2, wherein, wherein the second chamber includes a cylindrical portion, one end portion of the cylindrical portion being interposed into the coupling space, and wherein the inlet and the outlet are formed by cutting the cylindrical portion. The inner wall of the first chamber includes a first inner wall provided at an inner side of the outer wall, a second inner wall protruding from the first inner wall in the axial direction, and a plurality of outflow guide portions protruding from the second inner wall in a radial direction and spaced apart from each other in the circumferential direction.

5. The compressor of claim 4, wherein, The discharge space includes a first discharge space defined at an inner side of the first inner wall, a second discharge space defined at an inner side of the second inner wall, a third discharge space defined at an inner side of the outflow guide portion, and a fourth discharge space defined at an outer side of the outflow guide portion, 6. The compressor of claim 5, wherein, wherein the third discharge space and the movement passage communicate with each other through the inlet, and wherein the fourth discharge space and the movement passage communicate with each other through the outlet. The second inner wall includes an arcuate segment formed in an arcuate shape, and a straight segment linearly connecting both end portions of the arcuate segment, 7. The compressor of claim 6, wherein, wherein the second chamber includes a protruding portion protruding inward in the axial direction and the radial direction to contact the straight segment, and ​ The fourth discharge space is defined at an inner side of the protruding portion.

8. The compressor of claim 6, wherein, The first inner wall includes a first outlet hole through which refrigerant in the first discharge space moves to the second discharge space, and the second inner wall includes a second outlet hole through which refrigerant in the second discharge space moves to the third discharge space, The ribs include a first rib and a second rib that are spaced apart from each other in a circumferential direction to divide the movement passage into a first movement passage and a second movement passage in the circumferential direction, and The first rib is disposed between a plurality of extension lines extending axially from the outflow guide portion.

9. The compressor of claim 8, wherein, The first rib and the second rib are disposed to face each other so that the first movement passage and the second movement passage can have the same length.

10. The compressor of claim 8, wherein, The inlet includes a first inlet communicating with the first movement passage, and a second inlet communicating with the second movement passage, The first inlet and the second inlet are disposed between a plurality of extension lines extending axially from the outflow guide portion, and The outlet includes a first outlet communicating with the first movement passage, and a second outlet communicating with the second movement passage.

11. The compressor of claim 10, wherein, A cross-sectional area of the second outlet hole is the same as a sum of cross-sectional areas of the first movement passage and the second movement passage.

12. The compressor of claim 10, wherein, The first inlet and the second inlet have the same cross-sectional area, and The first outlet and the second outlet have the same cross-sectional area.

13. The compressor of claim 10, wherein, The first chamber further includes a division guide that divides the third discharge space into a first partial discharge space and a second partial discharge space, The second outlet hole includes a first partial outlet hole communicating with the first partial discharge space, and a second partial outlet hole communicating with the second partial discharge space, and The first inlet communicates with the first partial discharge space, and the second inlet communicates with the second partial discharge space.

14. The compressor of claim 13, wherein, A cross-sectional area of the first partial outlet hole is the same as a cross-sectional area of the first movement passage, and A cross-sectional area of the second partial outlet hole is the same as a cross-sectional area of the second movement passage.

15. The compressor of any one of claims 6-14, wherein, The discharge cover includes a discharge recess communicating with the outside, and The second chamber includes an outlet portion having an outlet recess through which refrigerant in the fourth discharge space flows out to the discharge recess.

16. The compressor of claim 15, wherein, The housing includes a discharge pipe through which refrigerant is discharged, and The discharge recess includes a discharge hole communicating with the discharge pipe.

17. The compressor of claim 15, wherein, The cylinder includes a nozzle for injecting refrigerant into a gap defined between an inner circumferential surface of the cylinder and an outer circumferential surface of the piston, and The discharge recess includes a gas bearing hole communicating with the nozzle.

18. The compressor of claim 15, wherein, The outlet portion protrudes from the cylindrical portion in a radial direction and extends in an axial direction, and The outlet recess is formed to pass through an inside of the outlet portion in the axial direction. The fourth discharge space is defined at an inner side of the protruding portion. The first inner wall includes a first outlet hole through which refrigerant in the first discharge space moves to the second discharge space, and the second inner wall includes a second outlet hole through which refrigerant in the second discharge space moves to the third discharge space, The ribs include a first rib and a second rib that are spaced apart from each other in a circumferential direction to divide the movement passage into a first movement passage and a second movement passage in the circumferential direction, and The first rib is disposed between a plurality of extension lines extending axially from the outflow guide portion. The first rib and the second rib are disposed to face each other so that the first movement passage and the second movement passage can have the same length. The inlet includes a first inlet communicating with the first movement passage, and a second inlet communicating with the second movement passage, The first inlet and the second inlet are disposed between a plurality of extension lines extending axially from the outflow guide portion, and The outlet includes a first outlet communicating with the first movement passage, and a second outlet communicating with the second movement passage. A cross-sectional area of the second outlet hole is the same as a sum of cross-sectional areas of the first movement passage and the second movement passage. A cross-sectional area of the first inlet and the second inlet is the same, and A cross-sectional area of the first outlet and the second outlet is the same. The first chamber further includes a division guide that divides the third discharge space into a first partial discharge space and a second partial discharge space, The second outlet hole includes a first partial outlet hole communicating with the first partial discharge space, and a second partial outlet hole communicating with the second partial discharge space, and The first inlet communicates with the first partial discharge space, and the second inlet communicates with the second partial discharge space. A cross-sectional area of the first partial outlet hole is the same as a cross-sectional area of the first movement passage, and A cross-sectional area of the second partial outlet hole is the same as a cross-sectional area of the second movement passage. The discharge cover includes a discharge recess communicating with the outside, and The second chamber includes an outlet portion having an outlet recess through which refrigerant in the fourth discharge space flows out to the discharge recess. The housing includes a discharge pipe through which refrigerant is discharged, and The discharge recess includes a discharge hole communicating with the discharge pipe. The cylinder includes a nozzle for injecting refrigerant into a gap defined between an inner circumferential surface of the cylinder and an outer circumferential surface of the piston, and The discharge recess includes a gas bearing hole communicating with the nozzle. The outlet portion protrudes from the cylindrical portion in a radial direction and extends in an axial direction, and The outlet recess is formed to pass through an inside of the outlet portion in the axial direction.

19. The compressor of any one of claims 6-14, wherein, Refrigerant discharged from the compression space moves to the fourth discharge space via the first discharge space, the second discharge space, the third discharge space, and the movement passage.

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