Linear compressor

Abstract

The present invention relates to a linear compressor. The linear compressor according to an embodiment of the present invention comprises: a first discharge cover forming a discharge space in which a refrigerant discharged through a discharge valve is accommodated; a second discharge cover coupled to the interior of the first discharge cover to shield the discharge space; and a fixed ring attached to the inner circumferential surface of the first discharge cover to partition the discharge space into a plurality of spaces.

Description

Linear compressor

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

[0002] In a reciprocating compressor, a compression space for compressing the working gas is formed between the piston and the cylinder, and the piston compresses the refrigerant introduced into the compression space as it moves in a straight line back and forth inside the cylinder.

[0003] Recently, among the aforementioned reciprocating compressors, many linear compressors have been developed that are simple in structure and can improve compression efficiency without mechanical losses occurring when converting the motor's rotational motion into linear motion, by directly connecting the piston to a drive motor that performs reciprocating linear motion.

[0004] Generally, a linear compressor is configured such that a piston moves in a reciprocating linear motion inside a cylinder driven by a linear motor within a sealed shell, drawing in and compressing refrigerant, and then discharging it.

[0005] The high-temperature refrigerant compressed in the compression space of the cylinder can flow toward the discharge cover via the discharge valve. The discharge cover is coupled to a frame supporting the cylinder and can form a discharge chamber through which the high-temperature discharge gas flows.

[0006] The above-mentioned high-temperature discharge gas transfers a certain amount of heat to the frame through the discharge cover, and the transferred heat becomes a factor that raises the temperature of the refrigerant (hereinafter referred to as the suction temperature) sucked into the compression space of the cylinder.

[0007] If the aforementioned suction temperature increases, the volume of refrigerant per unit mass—that is, the specific volume of the refrigerant—increases, leading to a decrease in volumetric efficiency. Consequently, this can result in a problem where the compression efficiency of the compressor decreases. Therefore, it is necessary to reduce the amount of heat transferred from the discharge cover to the frame.

[0008] In addition, the discharge cover may be composed of a plurality of discharge covers arranged to be stacked or in contact with one another. However, there is a problem in that significant vibration and noise are generated due to the pulsation of the refrigerant as it passes through the plurality of discharge covers.

[0009] Korean Registered Patent Publication No. 10-2357601 (January 26, 2022), Title of Invention: Linear Compressor

[0010] The present invention aims to provide a linear compressor capable of reducing the magnitude of vibration or noise generated during the refrigerant discharge process by securely fixing a plurality of discharge covers.

[0011] The present invention aims to provide a linear compressor capable of reducing pulsation noise by forming a pulsation path inside the discharge cover.

[0012] The present invention aims to provide a linear compressor that can reduce refrigerant pulsation noise by increasing the residence time of the refrigerant inside the discharge cover.

[0013] The present invention aims to provide a linear compressor that enables robust fixation between discharge covers without the need for separate fastening members.

[0014] The present invention aims to provide a linear compressor capable of reducing the amount of heat transferred to the frame by configuring some of the discharge covers among a plurality of discharge covers with a non-metallic material having a low heat transfer coefficient.

[0015] The present invention aims to provide a linear compressor capable of preventing defects in the connection between the discharge cover and the frame caused by thermal shrinkage by making the discharge cover connected to the frame from a metal material.

[0016] A linear compressor according to an embodiment of the present invention may include a first discharge cover forming a discharge space through which high-temperature discharge gas flows, a second discharge cover coupled to the interior of the first discharge cover to shield the discharge space, and a fixing ring coupled to the inner circumference of the first discharge cover to divide the discharge space into a plurality of spaces.

[0017] The above frame, the above first discharge cover, and the above fixing ring may be formed of a metal material.

[0018] The above second discharge cover may be formed of a non-metallic material.

[0019] The first discharge cover above may be formed from aluminum material.

[0020] The above second discharge cover may be formed of a plastic material.

[0021] The above-mentioned fixing ring can be formed from steel material.

[0022] The above fixing ring can be press-fitted onto the inner circumference of the first discharge cover.

[0023] The first discharge cover may include a connecting portion to which the fixing ring is coupled, which is recessed from the inner surface toward the outer surface.

[0024] The first discharge cover, the second discharge cover, and the fixing ring may be arranged to overlap in the radial direction.

[0025] The first discharge cover, the second discharge cover, and the fixing ring may be arranged to overlap in the axial direction.

[0026] The above fixed ring can divide the discharge space into a first space corresponding to the space between the fixed ring and the second discharge cover, and a second space corresponding to the space between the fixed ring and the first discharge cover.

[0027] The above fixing ring may include a cylindrical portion coupled to the inner circumference of the first discharge cover.

[0028] The above fixed ring may include an extension portion that extends radially inward from the inner circumferential surface of the cylindrical portion and divides the discharge space into the first space and the second space.

[0029] The outer diameter of the above cylindrical part may be formed to be smaller than the outer diameter of the above second discharge cover.

[0030] The end of the above cylindrical part can be in contact with the second discharge cover.

[0031] The end of the extension part may be spaced apart from the second discharge cover.

[0032] The first discharge cover may include a chamber portion forming the discharge space.

[0033] The first discharge cover may include a partition sleeve that extends in the axial direction from the inner surface of the chamber portion and partitions the discharge space into a plurality of discharge rooms.

[0034] The above-mentioned compartment sleeve can be formed in a cylindrical shape.

[0035] The outer diameter of the above-mentioned compartment sleeve may be formed to be smaller than the outer diameter of the above-mentioned fixing ring.

[0036] The above-mentioned compartment sleeve can divide the discharge space into a second discharge chamber corresponding to the inside of the compartment sleeve and a third discharge chamber corresponding to the outside of the compartment sleeve.

[0037] The above fixed ring can divide the third discharge chamber into a first space corresponding to the inside of the fixed ring and a second space corresponding to the outside of the fixed ring.

[0038] The refrigerant introduced into the second discharge chamber can be guided into the first space through a guide groove formed on the inner circumference of the compartment sleeve.

[0039] The refrigerant guided to the first space can be guided to the second space through a through hole formed on the inner side of the fixed ring.

[0040] The second discharge cover may include a cover flange coupled to the inner circumference of the chamber portion.

[0041] The second discharge cover may include a seating portion that extends axially from the inner edge of the cover flange to allow the discharge valve to be seated.

[0042] The second discharge cover may include a cover body that extends in the axial direction from the inner edge of the seating portion and forms a discharge chamber for the refrigerant discharged through the discharge valve.

[0043] The above-mentioned seating portion may contact the end of the above-mentioned compartment sleeve.

[0044] At least a portion of the above cover body can be inserted into the interior of the above compartment sleeve.

[0045] The above fixing ring may be in contact with the inner surface of the chamber portion and the cover flange, and may be spaced apart from the sleeve.

[0046] According to an embodiment of the present invention, by stacking a plurality of discharge covers and firmly fixing the plurality of discharge covers, the magnitude of vibration and noise generated during the refrigerant discharge process can be reduced.

[0047] According to an embodiment of the present invention, pulsation noise can be reduced by forming a pulsation path through a first discharge cover positioned on the outer side among a plurality of discharge covers by installing a fixing ring on the inner circumference of the first discharge cover.

[0048] According to an embodiment of the present invention, since the discharge space of the first discharge cover is divided into a plurality of spaces by a fixing ring, the residence time of the refrigerant inside the first discharge cover is increased, and thus the pulsation noise of the refrigerant can be reduced.

[0049] According to an embodiment of the present invention, by press-fitting a fixing ring onto the inner circumference of the first discharge cover, a secure fixation between discharge covers can be achieved without a separate fastening member.

[0050] According to an embodiment of the present invention, some of the discharge covers among the plurality of discharge covers are composed of a non-metallic material with a low heat transfer coefficient, thereby reducing the amount of heat transferred to the frame.

[0051] In addition, by making the other discharge cover connected to the frame out of a metal material, it is possible to prevent defects in the connection between the discharge cover and the frame caused by thermal shrinkage.

[0052] FIG. 1 is a perspective view of a linear compressor according to an embodiment of the present invention.

[0053] FIG. 2 is an exploded perspective view of a compressor body housed inside the shell of a compressor according to an embodiment of the present invention.

[0054] FIG. 3 is a cross-sectional view of a compressor according to an embodiment of the present invention.

[0055] FIGS. 4 and FIGS. 5 are exploded perspective views of a discharge cover assembly according to an embodiment of the present invention.

[0056] FIG. 6 is a cross-sectional perspective view of a discharge cover assembly according to an embodiment of the present invention.

[0057] FIG. 7 is a cross-sectional view of a discharge cover assembly according to an embodiment of the present invention.

[0058] FIG. 8 is a perspective view of a second discharge cover according to an embodiment of the present invention.

[0059] FIG. 9 is a cross-sectional perspective view of a second discharge cover according to an embodiment of the present invention.

[0060] FIG. 10 is a partial cross-sectional view showing the first discharge cover and the fixing ring combined according to an embodiment of the present invention.

[0061] FIG. 11 is a cross-sectional view showing the appearance of a refrigerant flowing through the discharge chamber of a discharge cover assembly according to an embodiment of the present invention.

[0062] FIG. 12 is a graph showing the change in noise generated according to the change in driving frequency for the control group and the present invention.

[0063] Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted.

[0064] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the embodiments of the present invention. These terms are intended only to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms. Where it is stated that a component is "connected," "combined," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but that another component may also be "connected," "combined," or "connected" between each component.

[0065] FIG. 1 is a perspective view of a linear compressor according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a compressor body housed inside a shell of a compressor according to an embodiment of the present invention, and FIG. 3 is a longitudinal cross-sectional view of a compressor according to an embodiment of the present invention.

[0066] Referring to FIGS. 1 to 3, a linear compressor (10) according to an embodiment of the present invention may include a shell (101) forming an exterior and a pair of shell covers coupled to both ends of the shell (101). The shell (101) may, for example, have a cylindrical shape. The pair of shell covers may include a first shell cover (102) on the refrigerant suction side and a second shell cover (103) on the refrigerant discharge side.

[0067] A leg (50) may be attached to the lower side of the shell (101). The leg (50) may be attached to the base of a product on which the linear compressor (10) is installed. For example, the product may include a refrigerator, and the base may include the machine room base of the refrigerator. As another example, the product may include an outdoor unit of an air conditioner, and the base may include the base of the outdoor unit.

[0068] The shell (101) is formed in a horizontal cylindrical shape, which has the advantage of reducing the height of the machine room when the linear compressor (10) is installed on the machine room base of the refrigerator. In other words, the longitudinal central axis of the shell (101) coincides with the central axis of the compressor body, which will be described later, and the central axis of the compressor body coincides with the central axis of the cylinder and piston constituting the compressor body.

[0069] A terminal block (108) may be installed on the outer surface of the shell (101). The terminal block (108) may be understood as a connection part that transmits external power to the motor assembly (140) of the linear compressor.

[0070] A bracket (109) is installed on the outer side of the terminal (108). The bracket (109) can perform the function of protecting the terminal (108) from external impacts, etc.

[0071] Both ends of the shell (101) are configured to be open. The first and second shell covers (102, 103) may be attached to the open ends of the shell (101). The internal space of the shell (101) may be sealed by the shell covers (102, 103).

[0072] Based on FIG. 1, the first shell cover (102) may be located on the right side (or rear end) of the linear compressor (10), and the second shell cover (103) may be located on the left side (or front end) of the linear compressor (10). Additionally, the end of the shell (101) on which the first shell cover (102) is mounted may be defined as the suction end, and the end of the shell (101) on which the second shell cover (103) is mounted may be defined as the discharge end.

[0073] The linear compressor (10) may further include a plurality of pipes (104, 105, 106) provided in the shell (101) or shell cover (102, 103). Through the plurality of pipes (104, 105, 106), refrigerant is introduced into the shell (101), compressed, and then discharged outside the shell (101).

[0074] In detail, the plurality of pipes (104, 105, 106) may include a suction pipe (104) for drawing refrigerant into the interior of the linear compressor (10), a discharge pipe (105) for discharging compressed refrigerant from the linear compressor (10), and a process pipe (106) for replenishing refrigerant to the linear compressor (10).

[0075] For example, the suction pipe (104) can be connected to the first shell cover (102), and the refrigerant can be sucked into the interior of the linear compressor (10) along the axial direction through the suction pipe (104).

[0076] The discharge pipe (105) can be coupled to the outer surface of the shell (101). The refrigerant sucked in through the suction pipe (104) can be compressed while flowing axially. The compressed refrigerant can then be discharged to the outside through the discharge pipe (105). The discharge pipe (105) can be positioned closer to the second shell cover (103) than to the first shell cover (102).

[0077] The process pipe (106) can be connected to the outer surface of the shell (101). An operator can inject refrigerant into the interior of the linear compressor (10) through the process pipe (106).

[0078] A cover support member (102a) may be provided in the center of the inner surface of the first shell cover (102). A second support device (185), to be described later, may be coupled to the cover support member (102a). The cover support member (102a) and the second support device (185) can be understood as devices that support the rear end of the compressor body so that the compressor body maintains a horizontal state inside the shell (101). Here, the compressor body refers to a set of parts provided inside the shell (101), and may include, for example, a drive unit that performs a forward and backward reciprocating motion and a support member that supports the drive unit.

[0079] The above driving unit may include a piston (130), a magnet frame (138), a permanent magnet (146), a supporter (137), and an intake muffler (150), etc. The above supporting unit may include parts such as a resonant spring (176a, 176b), a rear cover (170), a stator cover (149), a first supporting device (200), and a second supporting device (185).

[0080] The main body of the above linear compressor (10) may include a frame (110), a cylinder (120) fitted into the center of the frame (110), a piston (130) that moves in a linear reciprocating motion inside the cylinder (120), and a motor assembly (140) that provides driving force to the piston (130). The motor assembly (140) may be a linear motor that moves the piston (130) in a linear reciprocating motion in the axial direction of the shell (101).

[0081] The linear compressor (10) may further include a suction muffler (150). The suction muffler (150) is coupled to the piston (130) and is provided to reduce noise generated from the refrigerant sucked in through the suction pipe (104). The refrigerant sucked in through the suction pipe (104) flows into the interior of the piston (130) via the suction muffler (150). For example, as the refrigerant passes through the suction muffler (150), the flow noise of the refrigerant can be reduced.

[0082] The above intake muffler (150) may include a plurality of mufflers. The plurality of mufflers may include a first muffler (151), a second muffler (152), and a third muffler (153) that are coupled to each other.

[0083] In terms of the flow direction of the refrigerant, the refrigerant sucked in through the suction pipe (104) can pass through the third muffler (153), the second muffler (152), and the first muffler (151) in sequence. During this process, the flow noise of the refrigerant can be reduced.

[0084] A muffler filter (154) may be installed on the intake muffler (150).

[0085] Defines the direction.

[0086] "Axial direction" can be understood as the direction in which the piston (130) reciprocates, i.e., the left-right direction in FIG. 3. Among the "axial directions," the direction from the piston (130) toward the compression space (P) of the cylinder (140), i.e., the direction in which the refrigerant flows, is defined as "forward," and the opposite direction is defined as "rear." When the piston (130) moves forward, the compression space (P) is reduced, and when it moves rearward, the compression space (P) can be expanded.

[0087] On the other hand, "radial direction" is a direction perpendicular to the direction in which the piston (130) reciprocates, and can be understood as the vertical direction of FIG. 3.

[0088] The piston (130) may include a cylindrical piston body (131) and a piston flange (132) extending radially from the rear end of the piston body (131). The piston body (131) may reciprocate inside the cylinder (120), and the piston flange (132) may reciprocate outside the cylinder (120). The piston body (131) is configured to accommodate at least a portion of the first muffler (151).

[0089] A compression space (P) in which the refrigerant is compressed by the piston (130) is formed inside the cylinder (120). A plurality of suction holes (133) are formed at a point spaced radially from the center of the front part of the piston body (131).

[0090] The plurality of suction holes (133) are spaced apart in the circumferential direction of the piston (130), and refrigerant is introduced into the compression space (P) through the plurality of suction holes (133). The plurality of suction holes (133) may be spaced apart at regular intervals in the circumferential direction of the front part of the piston (130), or a number of them may be formed in a group.

[0091] Additionally, a suction valve (135) that selectively opens the suction port (133) is provided in front of the suction port (133). The suction valve (135) is fixed to the front of the piston body (131) by means of a fastening member (135a), such as a screw or a bolt.

[0092] Meanwhile, in front of the compression space (P), a discharge cover assembly (190) forming a discharge space for the refrigerant discharged from the compression space (P) and a discharge valve assembly coupled to the inside of the discharge cover assembly (190) for discharging the refrigerant compressed in the compression space (P) into the discharge space are provided.

[0093] The above discharge cover assembly (190) may be provided in a form in which a plurality of discharge covers are stacked.

[0094] The discharge cover assembly (190) may include a first discharge cover (191) supported on the front of the frame (110) and a second discharge cover (192) disposed on the inner side of the first discharge cover (191).

[0095] The discharge cover assembly (190) may further include a fixing ring (193) disposed inside the first discharge cover (191). The fixing ring (193) is formed in a cylindrical shape and can be in close contact with the inner circumference of the first discharge cover (191).

[0096] The above discharge valve assembly may include a discharge valve (161) and a spring assembly (240) that provides elastic force to the discharge valve (161) in a direction that brings it into close contact with the front end of the cylinder (120).

[0097] The discharge valve (161) is separated from the front of the cylinder (120) when the pressure in the compression space (P) exceeds the discharge pressure, so that the compressed refrigerant is discharged into the discharge space (or discharge room) formed inside the second discharge cover (192).

[0098] The above spring assembly (240) may include a valve spring (242) in the form of a leaf spring, a spring support member (241) that surrounds the edge of the valve spring (242) to support the valve spring (242), and a friction ring (243) fitted to the outer surface of the spring support member (241).

[0099] When the pressure of the above compression space (P) exceeds the discharge pressure, the valve spring (242) is elastically deformed toward the second discharge cover (192), so that the discharge valve (161) can be separated from the front end of the cylinder (120).

[0100] The front center portion of the discharge valve (161) is fixedly coupled to the center of the valve spring (242), and the rear portion of the discharge valve (161) can be pressed against the front (or front end) of the cylinder (120) by the elastic force of the valve spring (242).

[0101] When the discharge valve (161) is supported on the front of the cylinder (120), the compression space (P) remains in a sealed state, and when the discharge valve (161) is separated from the front of the cylinder (120), the compression space (P) is opened so that the compressed refrigerant inside the compression space (P) can be discharged.

[0102] The above compression space (P) can be understood as a space formed between the suction valve (135) and the discharge valve (161). The suction valve (135) may be formed on one side of the compression space (P), and the discharge valve (161) may be provided on the other side of the compression space (P), that is, on the opposite side of the suction valve (135).

[0103] During the process in which the piston (130) moves in a straight reciprocating motion inside the cylinder (120), when the pressure of the compression space (P) becomes less than or equal to the suction pressure of the refrigerant, the suction valve (135) is opened, and the refrigerant flows into the compression space (P).

[0104] On the other hand, when the pressure of the compression space (P) exceeds the suction pressure of the refrigerant, the suction valve (135) is closed, and the refrigerant in the compression space (P) is compressed by the advancement of the piston (130).

[0105] Meanwhile, when the pressure in the compression space (P) becomes greater than the pressure (discharge pressure) in the discharge space, the valve spring (242) is deformed forward, causing the discharge valve (161) to be separated from the cylinder (120). At this time, the refrigerant inside the compression space (P) is discharged into the discharge space formed inside the second discharge cover (192) through the gap between the discharge valve (161) and the cylinder (120).

[0106] When the discharge of the refrigerant is completed, the valve spring (242) provides a restoring force to the discharge valve (161), so that the discharge valve (161) can be closed again to the front end of the cylinder (120).

[0107] A gasket (210) is provided on the front of the spring support (241) so that when the discharge valve (161) is opened, the spring assembly (240) moves axially and directly strikes the second discharge cover (192), thereby preventing noise.

[0108] The above linear compressor (10) may further include a loop pipe (162). The loop pipe (162) is coupled to the first discharge cover (191) and discharges the refrigerant discharged from the compression space (P) into the discharge space inside the discharge cover assembly (190) to the outside.

[0109] To this end, one end of the loop pipe (162) may be connected to the first discharge cover (191), and the other end may be connected to the discharge pipe (105). The loop pipe (162) may be made of at least a portion of a flexible material and may extend roundly along the inner surface of the shell (101).

[0110] The above frame (110) can be understood as a configuration that fixes the cylinder (120). For example, the cylinder (120) can be inserted axially into the shell (101) at the center of the frame (110). The discharge cover assembly (190) can be coupled to the front of the frame (110) by means of a fastening member.

[0111] An insulating gasket (230) may be interposed between the first discharge cover (191) and the frame (110). The insulating gasket (230) is placed on the front of the frame (110) where the rear or rear end of the first discharge cover (191) contacts, thereby minimizing the conduction of heat from the discharge cover assembly (190) to the frame (110).

[0112] The motor assembly (140) may include an outer stator (141) fixed to the frame (110) and arranged to surround the cylinder (120), an inner stator (148) spaced inward from the outer stator (141), and a permanent magnet (146) located in the space between the outer stator (141) and the inner stator (148).

[0113] The permanent magnet (146) can move in a linear reciprocating motion in the axial direction due to the mutual electromagnetic force generated between the outer stator (141) and the inner stator (148). The permanent magnet (146) may be composed of a single magnet having one pole, or may be composed of a plurality of magnets having three poles combined.

[0114] The magnet frame (138) may be formed in a cylindrical shape with an open front and a closed rear. The permanent magnet (146) may be attached to the end of the open front of the magnet frame (138) or to the outer surface of the magnet frame (138). A through hole through which the suction muffler (150) passes is formed in the center of the rear of the magnet frame (138), and the suction muffler (150) may be fixed to the rear of the magnet frame (138).

[0115] The piston flange (132), which extends radially from the rear end of the piston (130), is fixed to the rear surface of the magnet frame (138). At this time, the rear edge of the first muffler (151) is interposed between the piston flange (132) and the rear surface of the magnet frame (138) and can be fixed to the center of the rear surface of the magnet frame (138).

[0116] When the permanent magnet (146) reciprocates in the axial direction, the piston (130) can reciprocate in the axial direction as one body with the permanent magnet (146).

[0117] The outer stator (141) may include a coil winding body and a stator core (141a). The coil winding body may include a bobbin (141b), a coil (141c) wound in the circumferential direction of the bobbin (141b), and a terminal portion (141d) that guides a power line connected to the coil (141c) to be drawn out or exposed to the outside of the outer stator (141).

[0118] A stator cover (149) is provided on one side of the outer stator (141). The front end of the outer stator (141) is fixedly supported on the frame (110), and the stator cover (149) is fixed to the rear end.

[0119] At this time, the cover fastening member (149a) penetrates the stator cover (149) and passes the edge of the outer stator (141) to be inserted and fixed to the frame (110). The motor assembly (140) is stably fixed to the rear surface of the frame (110) by the cover fastening member (149a).

[0120] The inner stator (148) is fixed to the outer surface of the frame (110). The inner stator (148) is formed by stacking a plurality of lamination plates in a circumferential direction on the outside of the frame (110).

[0121] The above frame (110) may include a disc-shaped frame head (110a) and a frame body (110b) that extends from the rear center of the frame head (110a) and accommodates the cylinder (120) inside. The discharge cover assembly (190) is fixed to the front of the frame head (110a), and the inner stator (148) is fixed to the outer circumference of the frame body (110b). A plurality of lamination plates constituting the inner stator (148) are stacked in the circumferential direction of the frame body (110b).

[0122] The above linear compressor (10) may include a supporter (137) that supports the rear end of the piston (130). The supporter (137) is coupled to the rear side of the piston (130) and may have a hollow portion formed therein to allow the intake muffler (150) to pass through.

[0123] The supporter (137) is fixed to the rear of the magnet frame (138). By means of a fastening member, the piston flange (132), the magnet frame (138), and the supporter (137) can be combined as one body.

[0124] A balance weight (179) may be attached to the supporter (137). The weight of the balance weight (179) may be determined based on the operating frequency range of the compressor body.

[0125] The above linear compressor (10) may further include a rear cover (170). The front end of the rear cover (170) is fixed to the stator cover (149) and extends rearward, and is supported by a second support device (185).

[0126] The rear cover (170) may include three support legs, and the front portions (or front portions) of the three support legs may be connected to the rear portion of the stator cover (149). A spacer (181) may be interposed between the three support legs and the rear portion of the stator cover (149). By adjusting the thickness of the spacer (181), the distance from the stator cover (149) to the rear portion of the rear cover (170) can be determined.

[0127] The linear compressor (10) may include an inlet guide (156) coupled to the rear cover (170) to guide the inflow of refrigerant into the intake muffler (150). The front end of the inlet guide (156) may be inserted into the inside of the intake muffler (150).

[0128] The above linear compressor (10) may include a plurality of resonant springs, each with a controlled natural frequency, so that the piston (130) can resonate.

[0129] The plurality of resonant springs may include a plurality of first resonant springs (176a) interposed between the supporter (137) and the stator cover (149), and a plurality of second resonant springs (176b) interposed between the supporter (137) and the rear cover (170).

[0130] By the action of the above-mentioned multiple resonant springs, stable linear reciprocating motion of the piston (130) is enabled inside the shell (101) of the linear compressor (10), and vibration or noise caused by the movement of the piston (130) can be minimized.

[0131] The above supporter (137) may include a spring insertion member (137a) into which the rear end of the first resonant spring (176a) is fitted.

[0132] The above linear compressor (10) may include a plurality of sealing members to increase the bonding force between the frame (110) and the parts surrounding the frame (110).

[0133] The plurality of sealing members may include a first sealing member (129a) provided between the cylinder (120) and the frame (110), and a second sealing member (129b) provided at the portion where the frame (110) and the inner stator (148) are joined.

[0134] The first and second sealing members (129a, 129b) may be ring-shaped.

[0135] The linear compressor (10) may include a pair of first support devices (200) that support the front end of the compressor (10) body. One end of each of the pair of first support devices (200) is fixed to the discharge cover assembly (190), and the other end is in close contact with the inner circumference of the shell (101). The pair of second support devices (200) may support the discharge cover assembly (190) in a spread-out state at an angle ranging from 90 to 120 degrees.

[0136] The above linear compressor (10) may include a second support device (185) that supports the rear end of the compressor body. The second support device (185) may include a second support spring (186) having a circular plate spring shape and a second spring support part (187) fitted into the center of the second support spring (186).

[0137] The outer edge of the second support spring (186) is fixed to the rear of the rear cover (170) by means of a fastening member, and the second spring support portion (187) is coupled to the cover support portion (102a) formed in the center of the first shell cover (102), so that the rear end of the compressor body is elastically supported at the center of the first shell cover (102).

[0138] FIGS. 4 and 5 are exploded perspective views of a discharge cover assembly according to an embodiment of the present invention, FIG. 6 is a cross-sectional perspective view of a discharge cover assembly according to an embodiment of the present invention, and FIG. 7 is a cross-sectional view of a discharge cover assembly according to an embodiment of the present invention.

[0139] FIG. 8 is a perspective view of a second discharge cover according to an embodiment of the present invention, and FIG. 9 is a cross-sectional perspective view of a second discharge cover according to an embodiment of the present invention. FIG. 10 is a partial cross-sectional view showing the first discharge cover and the fixing ring combined according to an embodiment of the present invention.

[0140] Referring to FIGS. 4 to 10, the discharge cover assembly (190) may include a first discharge cover (191) supported by the frame (110), a second discharge cover (192) coupled to the inside of the first discharge cover (191), and a fixing ring (193) coupled to the inside of the second discharge cover (192).

[0141] The first discharge cover (191) may be made of a metal material, for example, aluminum or an aluminum alloy. The first discharge cover (191) may be made of aluminum die casting.

[0142] The second discharge cover (192) may be composed of a material having a low coefficient of thermal expansion (heat transfer). The material having a low coefficient of thermal expansion may be a non-metallic material. For example, the second discharge cover (192) may be composed of a plastic material. The second discharge cover (192) may be composed of polyamide (PA66) as a type of heat-resistant engineering plastic.

[0143] The fixed ring (193) may be made of a material having a different coefficient of thermal expansion than the second discharge cover (192). The fixed ring (193) may be made of a metal material. For example, the fixed ring (193) may be made of steel or stainless steel.

[0144] The above spring assembly (240) can be seated at the rear end of the above second discharge cover (192).

[0145] The first discharge cover (191) is fixed to the front of the frame (110), and a discharge space (discharge room) is formed inside the first discharge cover (191) to receive the refrigerant discharged from the compression space (P).

[0146] For example, the first discharge cover (191) may have the shape of a container overall. That is, the first discharge cover (191) forms a discharge space with an open rear side, and the second discharge cover (192) may be inserted to cover the open rear side of the first discharge cover (191).

[0147] According to one embodiment, the first discharge cover (191) may include a flange portion (191f) supported on the front of the frame head (110a) and a chamber portion (191e) extending axially forward from the inner edge of the flange portion (191f) to the shell (101).

[0148] The first discharge cover (191) may further include a support device fixing part (191d) that extends further forward from the front of the chamber part (191e).

[0149] The chamber portion (191e) and the support device fixing portion (191d) may have a cylindrical shape. The outer diameter of the chamber portion (191e) may be formed smaller than the outer diameter of the flange portion (191f), and the outer diameter of the support device fixing portion (191d) may be formed smaller than the outer diameter of the chamber portion (191e).

[0150] The flange portion (191f) is bent at the rear end of the chamber portion (191e) and is configured to be in close contact with the front surface of the frame head (110a). That is, the flange portion (191f) can be extended radially outward from the rear end of the chamber portion (191e).

[0151] In another aspect, the flange portion (191f) may have a disc shape with a through hole formed approximately at the center. The through hole may be circular.

[0152] A fastening hole (191i) may be formed in the flange portion (191f) to be fastened to the frame head (110a) by a fastening member.

[0153] The above fastening holes (191i) may be formed in multiple numbers and spaced apart from each other. For example, the above fastening holes (191i) may be formed in three numbers and spaced apart at equal intervals in the circumferential direction of the flange portion (191f). That is, the flange portion (191f) is supported at three points on the frame head (110a), so that the first discharge cover (191) can be strongly fixed to the front of the frame (110).

[0154] A rotation prevention part (191j) may be formed on the outer surface of the flange portion (191f) to prevent the first discharge cover (191) from rotating while mounted on the frame (110). The rotation prevention part (191j) may be formed in a shape that is recessed from the outer surface of the flange portion (191f) toward the center of the flange portion (191f).

[0155] The chamber portion (191e) extends in the axial direction of the shell (101) from the front of the flange portion (191f). The chamber portion (191e) may be formed by extending in the axial direction of the shell (101) from the inside of the through hole formed in the flange portion (191f).

[0156] For example, the chamber portion (191e) may be extended in a hollow cylindrical shape. A discharge space through which a refrigerant flows may be provided inside the chamber portion (191e).

[0157] A partition sleeve (191a) that divides the internal space of the chamber (191e) into a plurality of spaces may be formed on the inner side of the chamber (191e).

[0158] The above partition sleeve (191a) may extend in a cylindrical shape from the inside of the chamber portion (191e). Specifically, the partition sleeve (191a) may be formed to protrude rearward from the front (191m) of the chamber portion (191e). At this time, the outer diameter of the partition sleeve (191a) is formed to be smaller than the outer diameter of the chamber portion (191e). Accordingly, the internal space of the chamber portion (191e) can be partitioned by the partition sleeve (191a).

[0159] In this embodiment, the space corresponding to the interior of the partition sleeve (191a) can be defined as the "second discharge chamber (D2)", and the space outside the partition sleeve (191a) can be defined as the "third discharge chamber (D3)". That is, the discharge space of the chamber portion (191e) can be seen as being divided into the second discharge chamber (D2) and the third discharge chamber (D3) by the partition sleeve (191a).

[0160] A first guide groove (191b) and a second guide groove (191c) may be formed on the inner surface of the above-mentioned compartment sleeve (191a). The first guide groove (191b) may be extended with a predetermined width and length in the longitudinal direction of the above-mentioned compartment sleeve (191a), and the second guide groove (191c) may be formed in a band shape with a predetermined width and length in the circumferential direction of the above-mentioned compartment sleeve (191a).

[0161] The second guide groove (191c) can be connected to the first guide groove (191b) so as to be in communication with it. Accordingly, the refrigerant guided to the second discharge chamber (D2) can move axially (rearward) along the first guide groove (191b) and then move circumferentially along the second guide groove (191c).

[0162] A communication groove (191h) with a depth extending from the end of the compartment sleeve (191a) to the second guide groove (191c) may be formed in a stepped manner on the inner surface of the compartment sleeve (191a). The communication groove (191h) may be connected to the second guide groove (191c).

[0163] The above-mentioned connecting groove (191h) can be understood as a passage through which the refrigerant, which has moved circumferentially along the above-mentioned second guide groove (191c), flows into the above-mentioned third discharge chamber (D3).

[0164] The above communication groove (191h) may be formed at a point spaced apart from the first guide groove (191b) in the circumferential direction of the partition sleeve (191a). For example, the communication groove (191h) may be formed at a position opposite to or facing the first guide groove (191b). Accordingly, the residence time of the refrigerant flowing into the second guide groove (191c) within the second guide groove (191c) may be increased, thereby effectively reducing the pulsation noise of the refrigerant.

[0165] In the drawings of this specification, the first guide groove (191b) is depicted as being recessed from the inner circumference of the partition sleeve (191a) and extending to the end of the partition sleeve (191a); however, in reality, the refrigerant guided to the second discharge chamber (D2) cannot flow into the second discharge chamber (D2) through the first guide groove (191b). That is, when the second discharge cover (192) is in close contact with the inner side of the first discharge cover (191), the end of the first guide groove (191b) can be shielded by the outer surface of the second discharge cover (192).

[0166] However, the first guide groove (191b) may inevitably be formed to extend to the end of the partition sleeve (191a) due to the aluminum die-casting process.

[0167] The above chamber portion (191e) may further include a pipe joint portion (191n) to which the loop pipe (162) is joined.

[0168] The pipe joint (191n) may be formed to protrude from the outer surface of the chamber (191e). A seating groove in which the loop pipe (162) is seated may be formed in the pipe joint (191n).

[0169] An insertion groove (191p) may be formed on the inner side of the above-mentioned seating groove, through which the inlet end of the loop pipe (162) passes and is inserted. At this time, the insertion groove (191p) may be in communication with the third discharge chamber (D3).

[0170] Accordingly, when the loop pipe (162) is inserted into the insertion groove (191p), the refrigerant of the third discharge chamber (D3) can be guided toward the loop pipe (162). The refrigerant guided toward the loop pipe (162) can be discharged outside the compressor through the discharge pipe (105).

[0171] The chamber portion (191e) may further include a recess (191r) to avoid interference with the loop pipe (162) when the loop pipe (162) is connected to the pipe joint portion (191n).

[0172] The above-mentioned recess (191r) functions to prevent the loop pipe (162) from coming into contact with the front surface (191m) of the chamber when the loop pipe (162) is inserted into the insertion groove (191p). To this end, the recess (191r) may be formed by being recessed backward from a part of the front surface (191m) of the chamber. That is, the recess (191r) may be formed at a step from the front surface (191m) of the chamber.

[0173] The support device fixing portion (191d) extends in the axial direction of the shell (101) from the front (191m) of the chamber portion. Specifically, the support device fixing portion (191d) may extend from the front (191m) of the chamber portion in a cylindrical shape having an outer diameter smaller than the outer diameter of the chamber portion (191e).

[0174] The ends of the pair of first support devices (200) are each connected to the outer surface of the support device fixing part (191d). To this end, a fastening groove (191w) is formed on the outer surface of the support device fixing part (191d) into which a fastening projection protruding from the front end of the first support device (200) is fitted.

[0175] A step-like projection (191g) on ​​the inner surface of the rear end of the chamber portion (191e) may be formed so as to catch the rear end of the second discharge cover (192).

[0176] A coupling groove (191s) for coupling the fixing ring (193) may be formed on the inner surface of the chamber portion (191e). The coupling groove (191s) can be understood as a portion into which the fixing ring (193) is fitted. The outer surface of the fixing ring (193) may come into contact with the inner surface of the chamber portion (191e).

[0177] The coupling groove (191s) may be formed by recessing a portion of the inner surface of the chamber portion (191e). The coupling groove (191s) may be formed by recessing from the inner surface of the chamber portion (191e) toward the outer surface. That is, the coupling groove (191s) may be recessed radially outward from the inner surface of the chamber portion (191e).

[0178] Additionally, the coupling groove (191s) may be formed to surround the inner surface of the chamber portion (191e) along the circumferential direction. That is, the coupling groove (191s) may be formed by being recessed in a band shape having a predetermined width and depth along the circumferential direction of the chamber portion (191e).

[0179] The fixing ring (193) can be press-fitted and fixed into the coupling groove (191s). The outer surface of the fixing ring (193) can be press-fitted and closely fitted into the inner side of the coupling groove (191s).

[0180] The second discharge cover (192) may be coupled to the inside of the first discharge cover (191). The second discharge cover (192) may be formed in a cap shape to form a discharge chamber for the refrigerant discharged from the discharge valve (161).

[0181] According to one embodiment, the second discharge cover (192) may include a flange (192e) whose outer edge engages with the catch (191g), a seating portion (192a) that is bent at the inner edge of the flange (192e) to allow the spring assembly (240) to be seated thereon, and a cover body (192d) extending from the front of the seating portion (192a).

[0182] The second discharge cover (192) may further include a bottle neck portion (192f) extending from the front center of the cover body (192d) to the rear. Here, the flange (192e) of the second discharge cover (192) may be named a "cover flange".

[0183] The above flange (192e) is a member that is inserted into a retaining projection (191g) formed on the first discharge cover (191). For example, the flange (192e) may have a hollow circular or elliptical shape. The flange (192e) may be fitted into the inner side of the rear end of the chamber portion (191e).

[0184] The above-mentioned seating portion (192a) may include a second portion (192c) that is bent forward from the inner edge of the flange (192e), and a first portion (192b) that is bent toward the center of the second discharge cover (192) from the front end of the second portion (192c). The cover body (192d) may be formed by being bent forward from the inner edge of the first portion (192b) and then bent toward the center of the second discharge cover (192).

[0185] In another aspect, the cross-sectional structure of the second discharge cover (192) can be described as follows: a bottleneck portion (192f) extends into the interior of the second discharge cover (192) from the front center of the cover body (192d); the first portion (192b) extends radially from the rear end of the cover body (192d); the second portion (192c) extends axially from the outer edge of the first portion (192b); and the flange (192e) extends radially from the rear end of the second portion (192c). With this configuration, the outer diameter of the cover body (192d) is formed to be smaller than the outer diameter of the flange (192e).

[0186] In this embodiment, when the second discharge cover (192) is inserted into the first discharge cover (191), the end of the partition sleeve (191a) formed on the inner side of the first discharge cover (191) may come into contact with the second discharge cover (192).

[0187] That is, when the edge of the flange (192e) catches on the catch (191g), the seating portion (192a) of the second discharge cover (192) comes into close contact with the end of the compartment sleeve (191a). The front surface of the second portion (192c) of the seating portion (192a) can come into close contact with the end of the compartment sleeve (191a).

[0188] The internal space of the above cover body (192d) can be defined as a first discharge chamber (D1), and a discharge hole (192g) through which the refrigerant discharged from the first discharge chamber (D1) passes can be formed at the rear end of the above bottleneck portion (192f).

[0189] When the second discharge cover (192) is inserted into the first discharge cover (191), the front surface of the seating portion (192a) comes into contact with the end of the partition sleeve (191a). At this time, the front surface of the seating portion (192a) comes into close contact with the end of the partition sleeve (191a), thereby shielding the second discharge chamber (D2).

[0190] However, since the communication groove (191h) formed at the end of the above-mentioned compartment sleeve (191a) is spaced apart from the above-mentioned seating portion (192a), the refrigerant guided to the second discharge chamber (D2) can be moved to the third discharge chamber (D3) through the communication groove (191h).

[0191] The outer surface of the cover body (192d) may be spaced apart from the first guide groove (191b) at a certain distance. Accordingly, the refrigerant guided to the second discharge chamber (D2) may be guided to the first guide groove (191b) and flow into the second guide groove (192c).

[0192] The front surface of the spring assembly (240) is seated on the first part (192b), and the friction ring (243) can generate frictional force by contacting the second part (192c).

[0193] In addition, by interposing the gasket (210) between the first part (192b) and the front of the spring support part (241), the spring support part (241) can be prevented from directly hitting the first part (192b).

[0194] Additionally, the outer edge of the valve spring (242) is inserted into the interior of the spring support (241), and the outer edge of the valve spring (242) may be located at a point closer to the rear than to the front of the spring support (241). Furthermore, the front center of the discharge valve (161) may be inserted into the center of the valve spring (242).

[0195] The fixed ring (193) is inserted into the inner circumference of the first discharge cover (191) and functions to reduce vibration and noise generated in the discharge cover assembly (190). The fixed ring (193) may be formed in a hollow cylindrical shape or a ring shape.

[0196] The fixing ring (193) can be pressed into the coupling groove (191s) of the first discharge cover (191) and fixed in close contact with the inner circumference of the first discharge cover (191). At this time, the flange (192e) of the second discharge cover (192) can be supported by contacting the rear end of the fixing ring (193). That is, the fixing ring (193) is inserted between the first discharge cover (191) and the second discharge cover (192) to increase the bonding force between the first discharge cover (191) and the second discharge cover (192).

[0197] The fixed ring (193) may be formed of a material having a coefficient of thermal expansion greater than that of the second discharge cover (192). For example, the fixed ring (193) may be made of steel or stainless steel, and the second discharge cover (192) may be made of engineering plastic.

[0198] According to one embodiment, the fixing ring (193) may include a cylindrical portion (193a) and an extension portion (193b) extending inward from the end of the cylindrical portion (193a).

[0199] The cylindrical portion (193a) has an open front and rear end and can be coupled to the inner circumference of the first discharge cover (191). The cylindrical portion (193a) extends in the axial direction and may have a hollow interior. The cylindrical portion (193a) can be press-fitted into the coupling groove (191s).

[0200] The outer diameter of the above cylindrical portion (193a) may be formed to be smaller than the outer diameter of the chamber portion (191e) of the first discharge cover (191). Also, the outer diameter of the above cylindrical portion (193a) may be formed to be larger than the outer diameter of the cover body (192d) of the second discharge cover (192).

[0201] The extension portion (193b) may extend in a central direction from the front portion of the cylindrical portion (193a). That is, the extension portion (193b) may extend radially inward from the edge of the front portion of the cylindrical portion (193a). The extension portion (193b) may be formed to surround the front portion edge of the cylindrical portion (193a) in a circumferential direction.

[0202] With this configuration, a through hole (193c) may be formed on the inner side of the extension portion (193b). The diameter of the through hole (193c) may be formed to be smaller than the outer diameter of the cylindrical portion (193a).

[0203] The fixed ring (193) can divide the internal space of the first discharge cover (191) into multiple spaces. The fixed ring (193) can divide the third discharge chamber (D3) of the first discharge cover (191) into a first space (D4) and a second space (D5).

[0204] Specifically, when the fixing ring (193) is coupled to the coupling groove (191s), the fixing ring (193) can be positioned in the third discharge chamber (D3) of the first discharge cover (191). At this time, the cylindrical part (193a) is in close contact with the coupling groove (191s), and the extension part (193b) can be positioned to divide the third discharge chamber (D3) into a front space and a rear space.

[0205] The rear space of the third discharge chamber (D3) can be defined as the first space (D4), and the front space of the third discharge chamber (D3) can be defined as the second space (D5).

[0206] The first space (D4) is understood as a space corresponding to the inside of the fixed ring (193), and the second space (D5) can be understood as a space corresponding to the outside of the fixed ring (193).

[0207] In this embodiment, the refrigerant introduced into the second guide groove (191c) can pass through the communication groove (191h) and enter the first space (D4). The refrigerant introduced into the first space (D4) can then enter the second space (D5) through the through hole (193c) and be discharged outside the compressor through the loop pipe (162).

[0208] Accordingly, the refrigerant introduced into the third discharge chamber (D3) may have its residence time in the third discharge chamber (D3) increased by the pulsating path additionally formed by the fixed ring (193). Accordingly, the pulsating noise of the refrigerant can be effectively reduced.

[0209] Here, the second space (D5) is a space formed by the fixed ring (193) and can be understood as a pulsation path for reducing pulsation that occurs when high-pressure discharge gas flows.

[0210] The above fixing ring (193) may be interposed between the first discharge cover (191) and the second discharge cover (192). Specifically, the outer surface of the fixing ring (193) may be in close contact with the inner surface of the first discharge cover (191), and the rear end of the fixing ring (193) may be in close contact with the flange (192e) of the second discharge cover (192).

[0211] The first discharge cover (191), the second discharge cover (192), and the fixing ring (193) can be arranged to overlap in the radial direction.

[0212] Additionally, the first discharge cover (191), the second discharge cover (192), and the fixing ring (193) may be arranged to overlap in the axial direction.

[0213] Accordingly, since the first discharge cover (191) and the second discharge cover (192) are strongly sealed by the fixing ring (193), the gap between the first discharge cover (191) and the second discharge cover (192) is eliminated, thereby preventing leakage of refrigerant.

[0214] FIG. 11 is a cross-sectional view showing the appearance of a refrigerant flowing through the discharge chamber of a discharge cover assembly according to an embodiment of the present invention.

[0215] Referring to FIG. 11, the refrigerant discharged from the compression space (P) by opening the discharge valve (161) passes through the slits formed in the valve spring (242) and is guided to the first discharge chamber (D1).

[0216] Here, the opening of the discharge valve (161) means that the discharge valve (161) moves in a direction closer to the rear end of the bottleneck (192f) due to the elastic deformation of the valve spring (242), thereby opening the front of the compression space (P).

[0217] The refrigerant guided to the first discharge chamber (D1) is guided to the second discharge chamber (D2) through the discharge hole (192g) formed at the rear end of the bottleneck portion (192f).

[0218] The refrigerant guided to the second discharge chamber (D2) moves axially along the first guide groove (191b) and then moves circumferentially along the second guide groove (191c). Then, the refrigerant that has moved circumferentially along the second guide groove (191c) passes through the communication groove (191h) and is guided to the first space (D4) of the third discharge chamber (D3).

[0219] The refrigerant guided to the first space (D4) passes through the through hole (193c) of the fixed ring (193) and is guided to the second space (D5) of the third discharge chamber (D3).

[0220] At this time, the fixed ring (193) acts as a flow resistance for the refrigerant flowing through the third discharge chamber (D3), thereby reducing pulsating noise.

[0221] The refrigerant guided to the second space (D5) is discharged outside the compressor through the loop pipe (162).

[0222] FIG. 12 is a graph showing the change in noise generated according to the change in driving frequency for the control group and the present invention.

[0223] Referring to FIG. 12, “the present invention” relates to a linear compressor having a structure as described in FIG. 1 to FIG. 11, and “control group” relates to a linear compressor that does not have a fixed ring as in the present invention.

[0224] The horizontal axis of FIG. 12 represents the operating frequency of the compressor, and the vertical axis represents the noise generated according to the operating frequency. It can be seen that, across the entire band of the operating frequency, the noise generated by the linear compressor of the present invention is less than the noise generated by the linear compressor of the control group.

[0225] In particular, in the high-frequency band (2~3.15kHz) where operating noise can be a problem when a linear compressor is installed in home appliances, such as refrigerators, the noise generated by the linear compressor of the present invention is less than the noise generated by the linear compressor of the control group.

Claims

A cylinder having a piston inserted therein that reciprocates axially and forms a compression space; A frame positioned outside the above cylinder; A discharge valve for discharging the refrigerant compressed in the above compression space; A first discharge cover coupled to the above frame and forming a discharge space in which refrigerant discharged through the discharge valve is received; A second discharge cover coupled to the interior of the first discharge cover and shielding the discharge space; and A linear compressor comprising a fixing ring coupled to the inner circumference of the first discharge cover and dividing the discharge space into a plurality of spaces. In paragraph 1, The above frame, the above first discharge cover, and the above fixing ring are formed of a metal material, and The above second discharge cover is a linear compressor formed of a non-metallic material. In paragraph 1, The first discharge cover is formed of aluminum material, and The above second discharge cover is formed of a plastic material, and The above fixed ring is a linear compressor formed of steel material. In paragraph 1, The above fixed ring is a linear compressor that is press-fitted to the inner circumference of the first discharge cover. In paragraph 1, A linear compressor in which the first discharge cover is recessed from the inner surface toward the outer surface and includes a coupling portion to which the fixing ring is coupled. In paragraph 1, The first discharge cover, the second discharge cover, and the fixing ring are arranged to overlap in the radial direction in a linear compressor. In paragraph 1, The first discharge cover, the second discharge cover, and the fixing ring are arranged to overlap in the axial direction of the linear compressor. In paragraph 1, The above fixed ring is a linear compressor that divides the discharge space into a first space corresponding to the space between the fixed ring and the second discharge cover, and a second space corresponding to the space between the fixed ring and the first discharge cover. In paragraph 8, The above-mentioned fixing ring is, A cylindrical part coupled to the inner circumference of the first discharge cover; and A linear compressor comprising an extension portion that extends radially inward from the inner circumferential surface of the above-mentioned cylindrical portion and divides the discharge space into the first space and the second space. In Paragraph 9, A linear compressor in which the outer diameter of the above-mentioned cylindrical part is formed to be smaller than the outer diameter of the above-mentioned second discharge cover. In Paragraph 9, The end of the above-mentioned cylindrical part is in contact with the second discharge cover, and The end of the above extension is a linear compressor spaced apart from the second discharge cover. In paragraph 1, The above-mentioned first discharge cover is, A chamber portion forming the discharge space above; and A linear compressor comprising a partition sleeve extending axially from the inner surface of the chamber portion and partitioning the discharge space into a plurality of discharge rooms. In Paragraph 12, The above-mentioned compartment sleeve is formed in a cylindrical shape, and A linear compressor in which the outer diameter of the above-mentioned compartment sleeve is formed to be smaller than the outer diameter of the above-mentioned fixed ring. In Paragraph 12, The above-described compartment sleeve is a linear compressor that divides the discharge space into a second discharge chamber corresponding to the inside of the compartment sleeve and a third discharge chamber corresponding to the outside of the compartment sleeve. In Paragraph 14, The above fixed ring is a linear compressor that divides the third discharge chamber into a first space corresponding to the inside of the fixed ring and a second space corresponding to the outside of the fixed ring. In paragraph 15, A linear compressor in which the refrigerant introduced into the second discharge chamber is guided into the first space through a guide groove formed on the inner surface of the compartment sleeve. In Paragraph 16, A linear compressor in which the refrigerant guided to the first space is guided to the second space through a through hole formed on the inner side of the fixed ring. In Paragraph 12, The above second discharge cover is, A cover flange coupled to the inner circumference of the chamber portion; A seating portion extending axially from the inner edge of the cover flange to allow the discharge valve to be seated; and A linear compressor comprising a cover body that extends axially from the inner edge of the above-mentioned seating portion and forms a discharge chamber for the refrigerant discharged through the discharge valve. In Article 18, The above-mentioned seating portion contacts the end of the above-mentioned compartment sleeve, and A linear compressor in which at least a portion of the above-mentioned cover body is inserted into the interior of the above-mentioned compartment sleeve. In Paragraph 18, The above fixed ring is in contact with the inner surface of the chamber portion and the cover flange, and is spaced apart from the sleeve in a linear compressor.

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