Linear compressor

Abstract

The present invention relates to a linear compressor. A linear compressor according to an embodiment of the present invention comprises: a discharge cover assembly which supports a discharge valve and forms a discharge chamber for a refrigerant discharged through the discharge valve; a frame which supports the discharge cover assembly; a cylinder which is supported inside the frame; a piston which is inserted into the cylinder and reciprocates in the front-rear direction; a support which comprises a base part coupled to the rear side of the piston and a spring support part extending backward from the base part; and a support cap member which is coupled to the spring support part and which includes a separation groove that is recessed in the direction going away from the spring support part.

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 so that a piston moves in a reciprocating straight line 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] A linear compressor may include a supporter that supports the piston. Since the piston moves in a reciprocating linear motion, the supporter that supports it can maintain the position of the piston by being spring-supported by covers positioned at the front and rear.

[0007] Meanwhile, a support cap member that supports the spring may be press-fitted and joined to the supporter. If the stress formed by the press-fitting of the support cap member into the supporter is excessively large, a problem may occur in which the support cap member detaches when the internal temperature rises due to the operation of the linear compressor.

[0008] (Patent Document 1) Korean Registered Patent Publication 10-2357601 (January 26, 2022), Title of Invention: Linear Compressor

[0009] The present invention aims to provide a linear compressor capable of reducing the amount of heat transfer from the discharge cover to the frame and preventing the suction temperature of the refrigerant from rising excessively by improving the thermal insulation structure of the discharge cover.

[0010] The present invention aims to provide a linear compressor capable of lowering the temperature of a discharge cover by configuring the discharge cover, through which high-temperature discharge gas flows, with a material having a low heat transfer coefficient.

[0011] The present invention aims to provide a linear compressor capable of preventing high-temperature heat from being transferred to a frame connected to a discharge cover by lowering the temperature of the discharge cover.

[0012] 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 forming the discharge chamber among a plurality of discharge covers with a non-metallic material having a low heat transfer coefficient, and preventing defects in the connection between the discharge cover and the frame caused by thermal shrinkage by configuring other discharge covers connected to the frame with a metal material.

[0013] 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 stacking a plurality of discharge covers and firmly fixing the plurality of discharge covers.

[0014] The present invention aims to provide a linear compressor that enables robust fixation between discharge covers without the need for separate fastening members by press-fitting and fixing a plurality of discharge covers.

[0015] The present invention aims to provide a linear compressor that can increase the fixing force between discharge covers and reduce the magnitude of valve tapping noise generated during the opening and closing process of the discharge valve by installing a damping member in the area where a plurality of discharge covers are pressed.

[0016] The present invention aims to provide a linear compressor capable of reducing pulsating noise by installing a damping member on a first discharge cover among a plurality of discharge covers to form a pulsating flow path.

[0017] The present invention aims to provide a linear compressor capable of structurally reducing the stress formed by a support cap member provided for supporting a resonant spring being pressed into a supporter, thereby preventing the support cap member from detaching from the supporter.

[0018] A linear compressor according to an embodiment of the present invention for solving the above problem comprises: a discharge cover assembly that supports a discharge valve and forms a discharge chamber for refrigerant discharged through the discharge valve; a frame that supports the discharge cover assembly; a cylinder supported inside the frame; a piston inserted inside the cylinder and reciprocating in the front-rear direction; a supporter including a base portion coupled to the rear of the piston and a spring support portion formed extending rearward from the base portion; and a support cap member coupled to the spring support portion and including a recessed groove formed in a direction away from the spring support portion.

[0019] The support cap member may include a cap support portion supported on a first surface positioned toward the front or rear of the spring support portion, and a cap insert portion connected to the cap support portion and spaced apart from the inner side of the cap support portion with the spaced groove in between.

[0020] The above spacing groove can be positioned between the cap support and the cap insertion part.

[0021] The support cap member further comprises a cap extension extending in a direction away from the spring support at the inner end of the cap support, and a cap connection connecting one end of the cap insertion part and one end of the cap extension, wherein the spacing groove may be disposed between the cap extension and the cap insertion part.

[0022] It may further include a resonant spring that is supported by the cap support and arranged to surround the outer surface of the cap extension.

[0023] The above cap support includes a first support surface that supports the resonant spring and a second support surface that supports the first surface of the spring support, wherein the first support surface and the second support surface may be arranged facing opposite directions.

[0024] The spring support member includes a second surface that intersects the first surface and defines a cap insertion hole that is opened so that the cap insertion member is pressed and joined, and the cap insertion member may include a first part spaced apart from the second surface and forming an end portion disposed inside the cap insertion hole, and a second part connected to the first part and supported by the second surface.

[0025] The second part above may be extended toward the outside of the cap insertion hole and positioned across the inside and outside of the cap insertion hole.

[0026] The device further includes a resonant spring supported by the cap support member, wherein the cap support member includes a first support surface that supports the resonant spring and a second support surface that supports the first surface of the spring support member, and wherein the first support surface and the second support surface may be arranged facing opposite directions.

[0027] The outer surface of the second part and the second support surface may be spaced apart from each other and extend in an intersecting direction.

[0028] The spring support member includes an open cap insertion hole, and the support cap member may include a cap support member supported on a first surface positioned toward the front or rear of the spring support member, and a cap insertion member positioned spaced apart from the inner side of the cap support member with the spaced groove in between, and configured to be press-fitted into the cap insertion hole and coupled thereto.

[0029] The apparatus further comprises an outer stator fixed to the rear of the frame and positioned to surround the cylinder; a stator cover positioned at the rear of the outer stator; and a rear cover coupled to the stator cover and extending to the rear, wherein the spring support may be positioned between the stator cover and the rear cover.

[0030] It may further include a first resonant spring supported between the spring support and the rear cover, and a second resonant spring supported between the spring support and the stator cover.

[0031] The support cap member may include a first support cap member coupled to one side of the spring support member to support the first resonant spring, and a second support cap member coupled to the other side of the spring support member to support the second resonant spring.

[0032] The above frame is composed of a metal material, and the discharge cover assembly includes a first discharge cover forming a first discharge chamber for refrigerant, and a second discharge cover coupled to the first discharge cover and forming a discharge chamber for refrigerant discharged from the first discharge chamber, wherein the first and second discharge covers are each supported to be in contact with the frame, and the first and second discharge covers are composed of a non-metal material to reduce the amount of heat transfer from the first and second discharge covers to the frame, and the first discharge cover includes a discharge hole for discharging refrigerant into the first discharge chamber; The device includes a recessed portion into which the refrigerant discharged from the discharge hole is introduced and to which the second discharge cover is coupled, wherein the second discharge cover includes an outer wall forming a space into which the first discharge cover is inserted, and an inner wall protruding from the inner surface of the outer wall and coupled to the first discharge cover, and the discharge chamber of the second discharge cover may include a second discharge chamber that defines an inner discharge chamber of the inner wall and is connected to the first discharge chamber, and a third discharge chamber that defines an outer discharge chamber of the inner wall.

[0033] According to an embodiment of the present invention, the compression efficiency of the compressor can be improved by improving the thermal insulation structure of the discharge cover to reduce the amount of heat transfer from the discharge cover to the frame and preventing the suction temperature of the refrigerant from rising excessively.

[0034] According to an embodiment of the present invention, by configuring the discharge cover through which high-temperature discharge gas flows with a material having a low heat transfer coefficient, the temperature of the discharge cover can be effectively lowered.

[0035] According to an embodiment of the present invention, by lowering the temperature of the discharge cover, high-temperature heat can be prevented from being transferred to the frame connected to the discharge cover.

[0036] According to an embodiment of the present invention, some of the discharge covers forming the discharge chamber among a plurality of discharge covers are composed of a non-metallic material having a low heat transfer coefficient, thereby reducing the amount of heat transferred to the frame.

[0037] 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.

[0038] 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 or noise generated during the refrigerant discharge process can be reduced.

[0039] According to an embodiment of the present invention, by press-fitting and fixing a plurality of discharge covers, a robust fixation between discharge covers can be achieved without a separate fastening member.

[0040] According to an embodiment of the present invention, a damping member is installed in the area where a plurality of discharge covers are pressed in, thereby increasing the fixing force between the discharge covers and reducing the magnitude of the valve tapping sound generated during the opening and closing process of the discharge valve.

[0041] According to an embodiment of the present invention, pulsating noise can be reduced by installing a damping member on a first discharge cover among a plurality of discharge covers to form a pulsating flow path.

[0042] According to an embodiment of the present invention, the stress formed by being pressed into a supporter through a spacing groove formed in a support cap member provided for supporting a resonant spring can be reduced. This prevents the support cap member from falling off due to temperature changes in the linear compressor.

[0043] FIG. 1 is a cross-sectional view of a linear compressor according to an embodiment of the present invention.

[0044] FIG. 2 is a perspective view of the main body of a linear compressor according to an embodiment of the present invention.

[0045] Figure 3 is a cross-sectional view taken along 3-3 of Figure 1.

[0046] FIG. 4 is an upper perspective view of a first discharge cover according to an embodiment of the present invention.

[0047] FIG. 5 is a lower perspective view of a first discharge cover according to an embodiment of the present invention.

[0048] FIG. 6 is an upper perspective view of a damping member according to an embodiment of the present invention.

[0049] FIG. 7 is an upper perspective view of a second discharge cover according to an embodiment of the present invention.

[0050] FIG. 8 is an upper perspective view of a third discharge cover according to an embodiment of the present invention.

[0051] FIG. 9 is a bottom view showing the second discharge cover and the third discharge cover combined according to an embodiment of the present invention.

[0052] FIG. 10 is a perspective view of a supporter according to an embodiment of the present invention.

[0053] Figure 11 is an enlarged view of the C1 region of Figure 1.

[0054] FIG. 12 is an upper perspective view of a support cap member according to an embodiment of the present invention.

[0055] FIG. 13 is a lower perspective view of a support cap member according to an embodiment of the present invention.

[0056] 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.

[0057] 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.

[0058] FIG. 1 is a cross-sectional view of a linear compressor according to an embodiment of the present invention. FIG. 2 is a perspective view of the main body of a linear compressor according to an embodiment of the present invention. FIG. 3 is a cross-sectional view taken along 3-3 of FIG. 1.

[0059] Referring to FIGS. 1 to 3, a linear compressor (10) according to an embodiment of the present invention may include a shell (11) and a first shell cover (12) and a second shell cover (13) coupled to both sides of the shell (11). For example, the first shell cover (12) may be coupled to the side where the refrigerant is sucked in, and the second shell cover (13) may be coupled to the side where the refrigerant is discharged. In a broad sense, the first shell cover (12) and the second shell cover (13) may be understood as components of the shell (11).

[0060] The shell (11) has a roughly cylindrical shape and can be arranged in a horizontally lying or axially lying configuration. Based on FIG. 1, the shell (11) is extended horizontally and may have a somewhat lower height in the radial direction.

[0061] For example, the linear compressor (10) can have a low height. Therefore, when the linear compressor (10) is installed on the base of the refrigerator's machine room, there is an advantage in that the height of the machine room can be reduced.

[0062] The linear compressor (10) is provided in a shell (11) or shell cover (12, 13) and may include a plurality of pipes capable of sucking, discharging, or injecting refrigerant.

[0063] The plurality of pipes may include a suction pipe (14) that allows the refrigerant to be sucked into the interior of the linear compressor (10). The suction pipe (14) may be connected to the first shell cover (12). The refrigerant may be sucked into the interior of the linear compressor (10) along the axial direction through the suction pipe (14).

[0064] The plurality of pipes may further include a discharge pipe (not shown) for allowing compressed refrigerant to be discharged from the linear compressor (10) and a process pipe (not shown) for replenishing refrigerant to the linear compressor (10). For example, the discharge pipe and the process pipe may be connected to the outer surface of the shell (11).

[0065] The linear compressor (10) may further include support devices (20, 21) that are positioned on both sides of the shell (11) and support the main body of the linear compressor (10). The support devices (20, 21) may include a first support device (20) that is coupled to the first shell cover (12) and elastically supports the main body of the linear compressor (10), and a second support device (21) that is coupled to the second shell cover (13) and supports the discharge cover assembly (100, 200, 300).

[0066] Here, the main body of the linear compressor (10) may refer to a component provided inside the shell (11). For example, the main body may include a drive unit that reciprocates back and forth and a support unit that supports the drive unit. The drive unit may include a piston (70), a permanent magnet (45), a supporter (80), and an intake muffler (25), etc. The support unit may include a resonant spring (30), a rear cover (31), a stator cover (32), a first support device (20), and a second support device (21), etc.

[0067] The first support device (20) may include a support bracket (21a) communicating with the suction pipe (14) and a support spring (21b) coupled to the support bracket (21a) and supported by the rear cover (31).

[0068] The linear compressor (10) may include a frame (50) provided inside the compressor shell (11) and a cylinder (60) inserted inside the frame (50). The cylinder (60) and the frame (50) may be made of a metal material, for example, aluminum or an aluminum alloy.

[0069] The linear compressor (10) may include a piston (70) that moves in a reciprocating linear motion inside a cylinder (60). The piston (70) may be configured to move in an axial direction.

[0070] The linear compressor (10) may further include a suction muffler (25) coupled to the piston (70) to reduce noise generated from the refrigerant sucked in through the suction pipe (14).

[0071] The refrigerant sucked in through the suction pipe (14) can flow into the interior of the piston (70) via the suction muffler (25). For example, as the refrigerant passes through the suction muffler (25), the flow noise of the refrigerant can be reduced. The suction muffler (25) may be composed of multiple mufflers combined.

[0072] The linear compressor (10) may include a motor assembly (41, 43, 45) as a linear motor that provides driving force to the piston (70).

[0073] The motor assembly (41, 43, 45) may include an outer stator (41) fixed to the frame (50) and arranged to surround the cylinder (60), an inner stator (43) spaced apart from the inner side of the outer stator (41), and a permanent magnet (45) located in the space between the outer stator (41) and the inner stator (43).

[0074] A stator cover (32) is provided on one side of the outer stator (41). That is, one side of the outer stator (41) is supported by a frame (50), and the other side can be supported by a stator cover (32).

[0075] The permanent magnet (45) can move in a linear reciprocating motion by means of mutual electromagnetic force with the outer stator (41) and the inner stator (43). The permanent magnet (45) may be composed of a single magnet having one pole or may be composed of a plurality of magnets having three poles combined.

[0076] A permanent magnet (45) can be installed in a magnet frame (46). The magnet frame (46) can be inserted and positioned in the space between the outer stator (41) and the inner stator (43). For example, the magnet frame (46) may have a roughly cylindrical shape.

[0077] The magnet frame (46) can be coupled to the piston (70). Thus, when the permanent magnet (45) reciprocates, the piston (70) can reciprocate axially together with the permanent magnet (45).

[0078] The linear compressor (10) may further include a supporter (80) that supports the piston (70). The supporter (80) is coupled to the rear side of the piston (70), and a muffler (25) may be positioned to pass through the inside thereof. The piston (70), the magnet frame (46), and the supporter (80) may be connected by a fastening member.

[0079] The linear compressor (10) may include a rear cover (31) that is coupled to the stator cover (32), extends rearward, and is supported by a first support device (20). The rear cover (31) may be spring-supported by a supporter (80).

[0080] The rear cover (31) may include a plurality of support legs that are coupled to the rear of the stator cover (32).

[0081] The linear compressor (10) may include an inlet guide (23) that is coupled to the rear cover (31) and guides the inflow of refrigerant into the intake muffler (25). At least a portion of the inlet guide (23) may be inserted into the inside of the intake muffler (25).

[0082] The linear compressor (10) may further include a plurality of resonant springs (30) each having a controlled natural frequency so that the piston (70) can resonate.

[0083] A plurality of resonant springs (30) may include a plurality of first resonant springs (30a) supported between the supporter (80) and the rear cover (31), and a plurality of second resonant springs (30b) supported between the supporter (80) and the stator cover (32). Through the action of the plurality of resonant springs (30), stable movement of the drive unit reciprocating inside the linear compressor (10) is performed, and vibration or noise generation due to the movement of the drive unit can be reduced.

[0084] Meanwhile, a support cap member (90) may be attached to the portion of the supporter (80) positioned between the first resonant spring (30a) and the second resonant spring (30b). For example, the support cap member (90) may be attached by press-fitting it into the supporter (80).

[0085] A support cap member (90) coupled to a supporter (80) can support a first resonant spring (30a) and a second resonant spring (30b). The support cap member (90) guides the first resonant spring (30a) and the second resonant spring (30b) to prevent the first resonant spring (30a) and the second resonant spring (30b) from falling off during operation of the linear compressor (10).

[0086] Detailed information regarding the specific shape of the supporter (80) and the support cap member (90) will be described later with reference to FIGS. 10 to 13.

[0087] The frame (50) can secure the cylinder (60). For example, the cylinder (60) can be pressed into the inside of the frame (50). The frame (50) can be positioned to surround the cylinder (60).

[0088] The frame (50) may include a frame body (51) having a hollow cylindrical shape and forming a space into which a cylinder (60) is inserted, and a frame flange (52) extending radially from the front portion of the frame body (51).

[0089] A cylinder sealing member (502) may be provided between the frame (50) and the cylinder (60). By means of the cylinder sealing member (502), the sealing force may be increased during the press-fitting process between the frame (50) and the cylinder (60). The cylinder sealing member (502) has a ring shape and may be installed on the inner surface of the frame (50) where the flange (62) of the cylinder (60) is seated.

[0090] A bearing channel (58) may be formed in the frame (50) extending from the frame flange (52) toward the frame body (51). The bearing channel (58) may be extended at an angle with respect to the axial direction of the linear compressor (10). A refrigerant acting as a gas bearing among the compressed discharge gas may flow in the bearing channel (58). The refrigerant acting as a gas bearing is supplied between the cylinder body (61) of the cylinder (60) and the piston (70) to cause the piston (70) to float inside the cylinder (60).

[0091] Defines the direction.

[0092] "Axial direction" can be understood as the direction in which the piston (70) reciprocates, i.e., the up-and-down direction in FIG. 3. In the "axial direction," the direction from the piston (70) toward the compression space (P) of the cylinder (60), i.e., the direction in which the refrigerant flows, is defined as "forward," and the opposite direction is defined as "rear." When the piston (70) moves forward, the compression space (P) is reduced, and when it moves rearward, the compression space (P) can be expanded.

[0093] On the other hand, "radial direction" is a direction perpendicular to the direction in which the piston (70) reciprocates, and can be understood as the horizontal direction of FIG. 3.

[0094] Inside the cylinder (60), a compression space (P) in which the refrigerant is compressed by the piston (70) may be formed. An intake port for introducing the refrigerant into the compression space (P) is formed at the front of the piston (70), and an intake valve (75) for selectively opening the intake port may be provided in front of the intake port.

[0095] The above suction port may be provided in multiple numbers. The multiple suction ports are spaced apart in the circumferential direction of the piston (70), and refrigerant is introduced into the compression space (P) through the multiple suction ports. The suction valve (75) may be connected to the front of the piston (70) by a fastening member (78), such as a screw or a bolt.

[0096] In front of the compression space (P), a discharge cover assembly (100, 200, 300) forming a discharge space for the refrigerant discharged from the compression space (P) may be provided. The discharge cover assembly (100, 200, 300) may be positioned in front of the frame (50).

[0097] The discharge cover assembly (100, 200, 300) may include a first discharge cover (100) and a second discharge cover (200) supported on the front of the frame (50). The first discharge cover (100) may be positioned inside the second discharge cover (200).

[0098] For example, the first discharge cover (100) can be press-fitted and fixed to the second discharge cover (200). The cover flange (150, see FIG. 4) of the first discharge cover (100) can be press-fitted into the inner circumference of the cover flange (250, see FIG. 7) of the second discharge cover (200). By press-fitting the first discharge cover (100) into the second discharge cover (200), the first and second discharge covers (100, 200) can be firmly fixed.

[0099] The internal space of the first discharge cover (100) and the internal space of the second discharge cover (200) can form a discharge path (also called a "discharge room") for the refrigerant discharged from the compression space (P). For example, the refrigerant discharged from the compression space (P) can flow through the internal space of the first discharge cover (100), be discharged from the first discharge cover (100), and flow into the internal space of the second discharge cover (200).

[0100] The refrigerant flowing through the discharge chamber of the first discharge cover (100) and the discharge chamber of the second discharge cover (200) can be in a high-temperature gaseous state. The high-temperature heat can be transferred to the frame (50) supporting the first and second discharge covers (100, 200).

[0101] If high-temperature heat is excessively transferred to the frame (50), that heat becomes a factor that causes the temperature (suction temperature) of the refrigerant sucked into the compression space (P) of the cylinder to rise. When the suction temperature rises, the volume of the refrigerant per unit mass, that is, the specific volume of the refrigerant, increases, causing the volumetric efficiency to decrease, and consequently, a problem may arise in which the compression efficiency of the compressor decreases.

[0102] To prevent such problems, the first discharge cover (100) and the second discharge cover (200) according to an embodiment of the present invention may be composed of a material having a low heat transfer coefficient. The material having a low heat transfer coefficient may be a non-metallic material.

[0103] The first discharge cover (100) and the second discharge cover (200) may include plastic. The first discharge cover (100) and the second discharge cover (200) may be composed of the same plastic material, for example, polyamide (PA66) as a type of heat-resistant engineering plastic.

[0104] Since the first and second discharge covers (100, 200) are made of plastic material, the amount of high-temperature heat within the first and second discharge covers (100, 200) that is directly transferred to the frame (50) or transferred between the first and second discharge covers (100, 200) can be reduced. Accordingly, the suction temperature of the refrigerant can be reduced and the compression efficiency of the compressor can be improved.

[0105] Meanwhile, since the first and second discharge covers (100, 200) are made of a relatively lightweight plastic material, there is a possibility that vibration and noise may occur in the first and second discharge covers (100, 200) due to the high-pressure refrigerant discharged from the compression space (P). To prevent such problems, the discharge cover assembly (100, 200, 300) according to the present embodiment may include a damping member (180) for reducing vibration of the first and second discharge covers (100, 200).

[0106] The damping member (180) is mounted in the recess (140, see FIG. 4) of the first discharge cover (100), and the inner wall (238) of the second discharge cover (200) may be configured to support or press the damping member (180). The damping member (180) can offset the magnitude of vibration and noise transmitted from one of the first and second discharge covers (100, 200) to the other cover.

[0107] By a structure in which a damping member (180) is mounted in a recess (140) of the first discharge cover (100), the recess (140) and the damping member (180) can form a flow path through which refrigerant flows. The flow path can be understood as defining a pulsation path to reduce pulsation that occurs when high-pressure discharge gas flows.

[0108] The detailed structure of the damping member (180) will be described later with reference to FIG. 6.

[0109] The linear compressor (10) may include a noise-reducing cap (285) to prevent noise generated when the second discharge cover (200) and the second shell cover (13) come into contact. The noise-reducing cap (285) may be attached to the front end of the third part (240) of the second discharge cover (200). For example, the noise-reducing cap (285) may be made of rubber material to absorb shock that may occur between the second discharge cover (200) and the second shell cover (13).

[0110] The discharge cover assembly (100, 200, 300) may further include a third discharge cover (300) that supports the second discharge cover (200).

[0111] The third discharge cover (300) may have a roughly ring shape and be positioned to surround the rear portion of the second discharge cover (200). The third discharge cover (300) may support the cover flange (250) of the second discharge cover (200). The third discharge cover (300) may be supported on the front of the frame (50).

[0112] The third discharge cover (300) is fastened to the frame flange (52) by a fastening member (not shown), and the front surface of the frame flange (52) may come into surface contact with the rear surface of the third discharge cover (300). For example, a frame fastening hole (55) into which the fastening member is inserted may be formed in the frame flange (52). Multiple frame fastening holes (55) may be formed. A cover fastening hole (335) may be formed in the third discharge cover (300) at a position corresponding to the frame fastening hole (55). The fastening member may be fastened to the frame fastening hole (55) and the cover fastening hole (335) to fix the frame (50) and the third discharge cover (300).

[0113] The third discharge cover (300) may be made of a material different from the first discharge cover (100) and the second discharge cover (200). The third discharge cover (300) may be made of a material having greater strength than the first discharge cover (100) and the second discharge cover (200).

[0114] For example, the third discharge cover (300) may be made of a metal material, for example, aluminum. Since the third discharge cover (300) is connected to the frame (50) by a fastening member, a failure in connection may occur if the amount of deformation increases due to high heat. Therefore, in this embodiment, the third discharge cover (300) connected to the frame (50) is made of a metal material with a low thermal deformation rate to reduce the failure rate of connection to the frame (50).

[0115] A frame sealing member (501) capable of increasing bonding strength and preventing refrigerant leakage may be provided at the portion where the second discharge cover (200) and the frame (50) are in surface contact. The frame sealing member (501) has a ring shape and may be installed between the rear surface of the second discharge cover (200) and the front surface of the frame (50).

[0116] The discharge cover assembly (100, 200, 300) may further include a discharge valve assembly (190). The discharge valve assembly (190) may include a discharge valve (191) and a spring assembly (193, 195) that provides elastic force in a direction in which the discharge valve (191) is pressed against the front end of the cylinder (60).

[0117] The spring assembly (193, 195) may include a valve spring (193) composed of a leaf spring and a spring bracket (195) that surrounds the edge of the valve spring (193) to support the valve spring (193).

[0118] The discharge valve (191) can be coupled to the central part of the valve spring (193). When the discharge valve (191) is opened, the refrigerant compressed in the compression space (P) of the cylinder (60) can be discharged and flow into the internal space of the first discharge cover (100). When the discharge of the refrigerant is completed, the discharge valve (191) can be closed by the restoring force of the valve spring (193).

[0119] The spring bracket (195) can be seated on the inner surface of the first discharge cover (100).

[0120] A sealing bracket (197) may be installed around the front portion of the cylinder (60). For example, the sealing bracket (197) may have a ring shape. The sealing bracket (197) may be seated on the front flange of the cylinder (60) and supported on the rear of the spring bracket (195).

[0121] A bracket sealing member (503) may be provided between the sealing bracket (197) and the flange of the cylinder (60). The bracket sealing member (503) is provided on the contact surface between the sealing bracket (197) and the flange of the cylinder (60), and can prevent refrigerant from leaking through the space between the cylinder (60) and the spring assembly (193, 195).

[0122] Below, the flow of refrigerant flowing inside the discharge cover assembly (100, 200, 300) is described.

[0123] The discharge cover assembly (100, 200, 300) may include a discharge chamber (A1, A2, A3) through which high-pressure discharge gas discharged from the discharge valve (191) flows.

[0124] The discharge chambers (A1, A2, A3) may include a first discharge chamber (A1) formed in the internal space of the first discharge cover (100). The first discharge chamber (A1) may be formed to face the discharge valve (191) as an internal space defined by the inner wall (130) of the first discharge cover (100).

[0125] When the discharge valve (191) is opened, the first discharge chamber (A1) is connected to the compression space (P), and the refrigerant compressed in the compression space (P) can flow into the first discharge chamber (A1).

[0126] The refrigerant in the first discharge chamber (A1) is discharged from the first discharge cover (100) through the discharge hole (123) of the first discharge cover (100), and the discharged refrigerant can flow to the second discharge chamber (A2) of the second discharge cover (200).

[0127] The second discharge chamber (A2) can be understood as one of the discharge chambers (A2, A3) formed in the internal space of the second discharge cover (200), and as the inner space of the inner wall (238) of the second discharge cover (200).

[0128] The inner wall (238) of the second discharge cover (200) can be inserted into the recess (140) of the first discharge cover (100). A damping member (180) may be introduced in the area where the inner wall (238) of the second discharge cover (200) and the recess (140) are joined, thereby reducing vibration and noise generated in the first and second discharge covers (100, 200).

[0129] The inner wall (238) of the second discharge cover (200) can be understood as a partition wall that divides the discharge chambers (A2, A3) of the second discharge cover (200) into the second discharge chamber (A2) and the third discharge chamber (A3). The third discharge chamber (A3) can be understood as the outer space of the inner wall (238).

[0130] For convenience of explanation, the first discharge chamber (A1) of the first discharge cover (100) and the second and third discharge chambers (A2, A3) of the second discharge cover (200) may be referred to in order as the first discharge chamber (A1), the second discharge chamber (A2), and the third discharge chamber (A3).

[0131] The refrigerant of the second discharge chamber (A2) can flow into the recess (140) of the first discharge cover (100) through the inlet of the pulsating passage formed in the recess (140), that is, the first recess (125). Since the second discharge chamber (A2) and the third discharge chamber (A3) are separated from each other by the inner wall (238) being coupled to the recess (140), the refrigerant of the second discharge chamber (A2) may be restricted from flowing directly into the third discharge chamber (A3).

[0132] The refrigerant introduced into the recess (140) can flow along the ring shape of the recess (140) and be discharged from the recess (140) through the second recess (113a) formed on the opposite side of the first recess (125). The second recess (113a) can function as an outlet for the pulsating flow path.

[0133] The pulsating noise generated from the discharged refrigerant can be reduced by the refrigerant flowing through a pulsating path formed along the shape of the recess (140).

[0134] The second recess (113a) can be connected to the outer space of the inner wall (238), that is, the third discharge chamber (A3). Therefore, the refrigerant discharged from the second recess (113a) can flow into the third discharge chamber (A3).

[0135] The third discharge chamber (A3) can be connected to the discharge hole (280) of the second discharge cover (200). Accordingly, the refrigerant in the third discharge chamber (A3) can be discharged to the outside of the second discharge cover (200) through the discharge hole (280) and discharged to the discharge pipe of the shell (11) through the loop pipe (290, see FIG. 7).

[0136] FIG. 4 is an upper perspective view of a first discharge cover according to an embodiment of the present invention. FIG. 5 is a lower perspective view of a first discharge cover according to an embodiment of the present invention.

[0137] Referring to FIG. 4 and FIG. 5 together with FIG. 3, a first discharge cover (100) according to an embodiment of the present invention may include a cover body (110) forming a discharge chamber and a cover flange (150) provided at the rear end of the cover body (110) and supported by a frame (50).

[0138] The cover body (110) may be configured to have a cap shape to form a discharge chamber for the refrigerant discharged from the discharge valve (191). The cover body (110) may include cylindrical outer walls (111a, 111b, 111c). The outer walls (111a, 111b, 111c) may include a first part (111a) forming a front portion and a second part (111b) connected to the cover flange (150). The first and second parts (111a, 111b) may be arranged in an axial direction. The first part (111a) and the second part (111b) may have a cylindrical shape by extending in a rounded manner in the circumferential direction.

[0139] The outer walls (111a, 111b, 111c) of the cover body (110) may be formed with steps. Specifically, the outer walls (111a, 111b, 111c) of the cover body (110) may further include a stepped portion (111c) connecting the first part (111a) and the second part (111b). The stepped portion (111c) may extend radially outward from the end of the first part (111a) and be connected to the second part (111b). Due to the stepped portion (111c), the outer diameter of the second part (111b) may be formed to be larger than the outer diameter of the first part (111a).

[0140] The first discharge cover (100) may include a front wall (120) forming the front of the first discharge cover (100). The front wall (120) may be disposed radially inward of the outer walls (111a, 111b, 111c).

[0141] The front wall (120) can form a discharge hole (123) that transmits the discharge gas present in the internal space of the first discharge cover (100), that is, the first discharge chamber (A1), to the outside of the first discharge cover (100).

[0142] The first discharge cover (100) may include a discharge guide (126) that protrudes from the front wall (120) toward the discharge valve (191). The discharge guide (126) may form a discharge hole (123). That is, the discharge hole (123) may be formed by penetrating from the discharge guide (126) to the front wall (120).

[0143] The first discharge cover (100) may include an inner wall (130) extending toward the rear from the edge of the front wall (120). The inner wall (130) may be rounded in the circumferential direction to have a cylindrical shape. The front wall (120), the inner wall (130), and the discharge guide (126) may define a discharge chamber within the first discharge cover (100).

[0144] A recess (140) may be formed between the outer wall (111a, 111b, 111c) and the inner wall (130). The recess (140) is formed to have a ring shape along the perimeter of the inner wall (130) and may be configured to be recessed from the front end of the first discharge cover (100) toward the rear. The rear end of the recess (140) may be formed at a height corresponding to the stepped portion (111c) of the outer wall.

[0145] The recess (140) may be formed along the perimeter of the discharge hole (123) formed in the center of the first discharge cover (100). Specifically, the discharge hole (123) may be formed in the center of the front wall (120), and the recess (140) may be formed along the outer perimeter of the front wall (120).

[0146] The recess (140) can form a flow path for the discharged gas. The discharged gas exhibits a pulsation phenomenon in which the pressure or flow rate changes periodically, and noise may be generated due to the pulsation. In this embodiment, the pulsation can be reduced by configuring the flow path of the discharged gas in a rounded shape through the ring-shaped recess (140) and forming the length of the flow path to be long.

[0147] Additionally, the recess (140) may be formed between the second discharge chamber (A2) and the third discharge chamber (A3) of the second discharge cover (200). The cross-sectional area of ​​the recess (140) may be formed to be smaller than the cross-sectional area of ​​the second discharge chamber (A2) and / or the cross-sectional area of ​​the third discharge chamber (A3). Accordingly, as the discharge gas flows from the second discharge chamber (A2), which has a relatively large cross-sectional area, to the recess (140), which has a small cross-sectional area, and then flows again to the third discharge chamber (A3), which has a large cross-sectional area, pulsating noise may be reduced.

[0148] A damping member (180) may be installed in the first discharge cover (100). The damping member (180) is inserted into the recess (140) and can cover the open front portion of the recess (140).

[0149] In the recess (140), a support projection (139, 111d) for supporting the damping member (180) may be provided.

[0150] The support ridge may include a first support ridge (139) formed in a stepped manner on the outer surface of the inner wall (130). The first support ridge (139) protrudes from the outer surface of the inner wall (130) and may have a ring shape corresponding to the shape of the damping member (180).

[0151] The support ridge may include a second support ridge (111d) formed in a stepped manner on the inner circumference of the outer wall (111a, 111b, 111c). The second support ridge (111d) protrudes from the inner circumference of the outer wall (111a, 111b, 111c) and may have a ring shape corresponding to the shape of the damping member (180).

[0152] With the damping member (180) inserted into the recess (140), the rear end of the damping member (180) may be spaced apart from the rear end of the recess (140). The space between the rear end of the recess (140) and the rear end of the damping member (180) may form a flow path through which discharge gas flows.

[0153] The refrigerant discharged to the outside of the first discharge cover (100) through the discharge hole (123) can flow into the flow path within the recess (140). The first discharge cover (100) may include a configuration for guiding the refrigerant to flow into the interior of the recess (140).

[0154] In detail, the first discharge cover (100) may include a recess (125) that is recessed radially inward from the inner wall (130), that is, in a direction approaching the discharge hole (123). The recess (125) may be formed from the front wall (120) to the rear end of the recess (140).

[0155] The discharge gas discharged from the discharge hole (123) flows into the recess (125) through the depression (140) and can flow circumferentially at the rear of the damping member (180). The recess (125) can be understood as the inlet of a pulsating flow path formed within the depression (140).

[0156] The first discharge cover (100) may include a configuration for guiding the discharge of refrigerant within the recess (140) to the outside. Specifically, the first discharge cover (100) may include a protrusion (113) that protrudes radially outward from the outer wall, that is, in a direction away from the discharge hole (123).

[0157] The back surface of the protrusion (113) can be understood as forming a recess (113a) that is recessed from the inner surface of the outer wall. The recess (113a) may be formed from the front end of the recess (140) to the rear end of the recess (140). The recess (125) may be named "first recess" and the recess (113a) may be named "second recess".

[0158] The discharge gas that has flowed through the pulsating flow path within the recess (140) can be discharged from the recess (140) through the recess (113a). The recess (113a) can be understood as an outlet of the pulsating flow path formed within the recess (140).

[0159] The recess (113a) can be connected to the third discharge chamber (A3) of the second discharge cover (200).

[0160] The center of the first discharge cover (100) may be formed at the center of the discharge hole (123). The first recess (125a) and the second recess (113a) may be formed opposite each other with respect to the center.

[0161] The extension line connecting the first recess (125a) and the second recess (113a) can pass through the center of the first discharge cover (100) and the discharge hole (123).

[0162] The discharge gas discharged from the discharge hole (123) flows into the recess (140) through the first recess (125) and flows in a clockwise and counterclockwise direction and can be discharged from the recess (140) at the second recess (113a).

[0163] The first recess (125) may be named the "inlet" of the pulsating channel formed in the recess (140) of the first discharge cover (100), and the second recess (113a) may be named the "outlet" of the pulsating channel.

[0164] That is, the refrigerant in the second discharge chamber (A2) of the second discharge cover (200) flows into the recess (140) through the first recess (125), and is discharged from the recess (140) through the second recess (113a) and flows to the third discharge chamber (A3) of the second discharge cover (200).

[0165] The first discharge cover (100) may include ribs for reinforcing the strength of the discharge cover made of plastic material. Specifically, the first discharge cover (100) may include an inner surface where reinforcing ribs (135) are installed. The inner surface of the first discharge cover (100) can be understood as a wall surface defining the discharge room.

[0166] The reinforcing rib (135) can be configured to protrude from the inner surface of the first discharge cover (100).

[0167] The reinforcing rib (135) is connected to the discharge guide (126) and may include a first portion extending along the rear of the front wall (120). The first portion may extend radially.

[0168] The reinforcing rib (135) may include a second portion extending along the inner wall (130) from the rear of the front wall (120). The second portion is connected to the first portion and may extend axially (rearward).

[0169] A plurality of reinforcing ribs (135) are provided, and the plurality of reinforcing ribs (135) may be spaced apart in the circumferential direction. The plurality of reinforcing ribs (135) act as flow resistance bodies for the discharge gas flowing in the internal space of the first discharge cover (100) to reduce the magnitude of the pulsation.

[0170] The first discharge cover (100) may include a connecting rib (136) connecting the outer wall (111a, 111b, 111c) and the inner wall (130). For example, the connecting rib (136) may connect the rear end of the inner wall (130) and the inner surface of the second part (111b).

[0171] A plurality of connecting ribs (136) are provided, and the plurality of connecting ribs (136) may be spaced apart in the circumferential direction. The plurality of connecting ribs (136) may be connected to a plurality of reinforcing ribs (135). The connecting ribs (136) can be understood as forming at least a portion of the reinforcing ribs (135).

[0172] The connecting rib (136) can be positioned further back than the bottom surface of the depression (140).

[0173] The inner surface of the first discharge cover (100) can have a stepped configuration by means of the outer wall (111a, 111b, 111c), the inner wall (130), and the connecting rib (136).

[0174] In detail, the axial length of the outer wall (111a, 111b, 111c) may be formed to be longer than the axial length of the inner wall (130). Additionally, the connecting rib (136) may extend radially outward from the rear end of the inner wall (130) and be connected to the inner circumference of the outer wall.

[0175] With this configuration, the inner surface of the first discharge cover (100) is configured to be stepped, and the discharge valve assembly (190) can be supported on the stepped inner surface of the first discharge cover (100).

[0176] The front edge of the discharge valve assembly (190) is supported by a connecting rib (136), and the outer surface of the discharge valve assembly (190) can be supported on the inner surface of the outer wall (111a, 111b, 111c). Of course, the size of the discharge valve assembly (190) will be configured to be sized to fit the stepped inner surface of the first discharge cover (100).

[0177] In order to prevent circumferential slip of the discharge valve assembly (190), a projection groove (132) into which a projection (not shown) of the discharge valve assembly (190) is inserted may be formed at the rear end of the inner wall (130). Multiple projection grooves (132) are formed in the circumferential direction, and by inserting multiple projections into multiple projection grooves (132), unwanted rotation of the discharge valve assembly (190) during the refrigerant discharge process can be prevented.

[0178] The cover flange (150) may extend radially outward from the rear end of the cover body (110) to have a radius larger than that of the cover body (110). The cover flange (150) may have a roughly ring shape.

[0179] The rear end of the cover flange (150) may form a support surface (151) that contacts the frame (50). A reduction portion (152) may be formed at the rear end of the cover flange (150). The reduction portion (152) may be formed by indenting at least a part of the cover flange (150).

[0180] A plurality of weight loss sections (152) are formed, and the plurality of weight loss sections (152) are formed spaced apart in the circumferential direction, and a support surface (151) may be formed between the plurality of weight loss sections (152).

[0181] By forming the reduction portion (152), the contact area between the first discharge cover (100) and the frame (50) can be reduced, and accordingly, the amount of heat transferred from the first discharge cover (100) to the frame (50) can be reduced.

[0182] The cover flange (150) may include a recessed bearing groove (155) to guide at least a portion of the discharge gas refrigerant into the bearing channel (58). The bearing groove (155) is recessed from the outer surface of the cover flange (150) so as to be refrigerant-fluidly connected to the bearing channel (58).

[0183] For example, at least some of the refrigerant among the discharge gas present in the internal space of the second discharge cover (200) can flow into the bearing channel (58) through the bearing groove (155).

[0184] FIG. 6 is an upper perspective view of a damping member according to an embodiment of the present invention.

[0185] Referring to FIG. 6 together with FIG. 3, a damping member (180) according to an embodiment of the present invention may be provided in one area of ​​the region where the first discharge cover (100) and the second discharge cover (200) are combined. In particular, the damping member (180) may be provided in a partition wall that divides the internal space of the second discharge cover (200) into two or more discharge chambers (A2, A3). As an example, the partition wall may include an inner wall (238) provided in the second discharge cover (200).

[0186] The damping member (180) may have a ring shape with an internal hollow portion (186) to form a hollow portion. The damping member (180) may be configured to be inserted into a recess (140) formed in the first discharge cover (100). Specifically, the damping member (180) may include a first part (181) that forms a groove (184) into which an inner wall (238) is inserted.

[0187] The first part (181) may include a ring-shaped inner surface portion (182) and a ring-shaped outer surface portion (183) surrounding the inner surface portion (182).

[0188] The first part (181) may include a groove (184) formed between the inner surface portion (182) and the outer surface portion (183). The groove (184) has a width in the radial direction and can be inserted into the inner wall (238) of the second discharge cover (200). For example, the inner wall (238) can be pressed into the groove (184). The bottom surface of the groove (184) can connect the rear ends of the inner surface portion (182) and the outer surface portion (183).

[0189] The damping member (180) may include a second part (185) that is connected to the rear end of the first part (181) and extends rearward. For example, the second part (185) may extend rearward from the bottom surface of the groove (184).

[0190] The second part (185) extends rearward from approximately the center of the rear end of the first part (181) and may be formed with a step relative to the first part (181). For example, the first part (181) and the second part (185) may have an approximately Y shape.

[0191] The second part (185) can extend into the recess (140) of the first discharge cover (100). The rear end of the second part (185) can form the rear end of the damping member (180).

[0192] The damping member (180) can reduce vibrations occurring between the first discharge cover (100) and the second discharge cover (200).

[0193] In addition, as described above, the damping member (180) can reduce the pulsating noise of the discharged gas by being inserted into the recess (140) of the first discharge cover (100) and defining a part of the pulsating flow path formed in the recess (140).

[0194] FIG. 7 is an upper perspective view of a second discharge cover according to an embodiment of the present invention. FIG. 8 is an upper perspective view of a third discharge cover according to an embodiment of the present invention. FIG. 9 is a bottom view showing the second discharge cover and the third discharge cover combined according to an embodiment of the present invention.

[0195] Referring to FIG. 3 and FIG. 7 through 9, the second discharge cover (200) forms an internal space that accommodates the first discharge cover (100), and the internal space may include a flow path for the refrigerant discharged from the discharge valve (191).

[0196] The second discharge cover (200) may include a cover body (210) that forms a discharge chamber for the refrigerant and a cover flange (250) provided at the rear end of the cover body (210) and supported by a frame (50).

[0197] The cover body (210) may be configured to have a cap shape to form a discharge chamber for the refrigerant discharged from the discharge valve (191).

[0198] The cover body (210) may include an outer wall (220, 230). The outer wall (220, 230) may include a first part (220) connected to the cover flange (250) and a second part (230) extending forward from the front end of the first part (220).

[0199] The first part (220) can be extended in a rounded direction to have a cylindrical shape.

[0200] The second part (230) may be extended axially from the first part (220). The second part (230) may be formed stepwise from the first part (220).

[0201] The second discharge cover (200) may further include a protrusion (233) extending radially outward from the second part (230). The protrusion (233) is connected to the first part (220) and may extend axially to the cover flange (250).

[0202] The protrusion (233) may include a discharge hole (280) for discharging refrigerant from the discharge chamber of the second discharge cover (200). The discharge hole (280) is formed on the side of the protrusion (233) and may be in communication with the internal space (discharge chamber) of the second discharge cover (200).

[0203] A loop pipe (290) connected to a discharge pipe provided in the shell (11) of a linear compressor (10) may be connected to the discharge port (280). Refrigerant discharged from the discharge port (280) may flow to the discharge pipe through the loop pipe (290). The loop pipe (290) is made of a flexible material and may be formed to be relatively long. The loop pipe (290) may be connected to the discharge port (280) and extend along the outer surface of the second discharge cover (200). The loop pipe (290) may function as a pulsation reduction channel that reduces the pulsation of the discharge gas together with the recess (140) of the first discharge cover (100).

[0204] The second discharge cover (200) may include a recess (235) that guides the extension position of the loop pipe (290). For example, the recess (235) may be configured to have a shape that is recessed into the outer surface of the second part (230).

[0205] The protrusion (233) may include a plurality of grooves (234a, 234b). The plurality of grooves (234a, 234b) may allow for a reduction in the contact area with the frame (50) to reduce the amount of heat transferred from the high-temperature discharge gas to the frame (50). Additionally, the plurality of grooves (234a, 234b) may allow for an increase in the heat dissipation area to increase the amount of heat dissipated from the second discharge cover (200).

[0206] A plurality of grooves (234a, 234b) may include a first groove (234a) that is recessed on the outermost radial surface of the protrusion (233) and a second groove (234b) that is formed on the surface in contact with the frame (50) and forms the rear end of the protrusion (233).

[0207] The first groove (234a) is formed axially from the second part (230) to the rear end of the second discharge cover (200) and may include a plurality of grooves aligned in the circumferential direction. By the first groove (234a), the heat dissipation area of ​​the protrusion (233) may be increased.

[0208] The second groove (234b) may include a plurality of grooves that are recessed forward from the surface in contact with the frame (50). The plurality of grooves of the second groove (234b) may be aligned in a circumferential direction.

[0209] The second discharge cover (200) may include a third part (240) extending forward from the second part (230). The third part (240) may protrude in a direction extending from the second part (230) toward the second shell cover (13). A noise-reducing cap (285) may be attached to the front end of the third part (240).

[0210] The third part (240) is configured to extend forward from the second part (230) among the outer walls (220, 230) of the cover body (210), so it can be referred to as a cover extension part.

[0211] The cover flange (250) forms the rear end of the second discharge cover (200) and may have an outer diameter and an inner diameter larger than that of the cover body (210). For example, the cover flange (250) may have a ring shape.

[0212] The cover flange (250) may include a contact surface (251) that contacts the frame (50). The contact surface (251) may form a rear end of the cover flange (250) and extend along the outer circumference of the cover flange (250) to have a ring shape.

[0213] The cover flange (250) may include an outer surface portion (252) that forms the exterior of the cover flange (250) and defines the outer diameter of the cover flange (250), and an inner surface portion (253) that supports the first discharge cover (100) and defines the inner diameter of the cover flange (250).

[0214] The cover flange (250) extends radially inward from the inner circumferential portion (253) and may include a projection (255) that defines the step difference between the cover body (210) and the cover flange (250).

[0215] The inner surface portion (253) and the ledge (255) can support the cover flange (150) of the first discharge cover (100). For example, the first discharge cover (100) is pressed into the inner side of the second discharge cover (200), and the inner surface portion (253) and the ledge (255) can provide a press-fit surface of the first discharge cover (100).

[0216] The second discharge cover (200) may include an inner wall (238) protruding from the inner surface of the outer wall (220, 230). The inner wall (238) may be configured to extend rearward from the rear end of the second part (230).

[0217] The inner wall (238) may extend from the second part (230) toward the recess (140) of the first discharge cover (100). The inner wall (238) may have a ring shape and may have a size corresponding to the recess (140) so that it can be inserted into the recess (140) of the first discharge cover (100).

[0218] The inner wall (238) can be inserted into the groove (184) of the damping member (180). By connecting the inner wall (238) to the first discharge cover (100) through the damping member (180), vibration and noise generated from the second discharge cover (200) and the first discharge cover (100) can be reduced.

[0219] The inner wall (238) can divide the discharge chambers (A2, A3) formed inside the second discharge cover (200) into the second discharge chamber (A2) and the third discharge chamber (A3). The second discharge chamber (A2) forms the inner discharge chamber of the inner wall (238), and the third discharge chamber (A3) forms the outer discharge chamber of the inner wall (238).

[0220] The third discharge chamber (A3) is arranged to surround the second discharge chamber (A2), and the refrigerant of the second discharge chamber (A2) can flow into the recess (140) of the first discharge cover (100) and be discharged into the third discharge chamber (A3). That is, the third discharge chamber (A3) can form a downstream flow path of the second discharge chamber (A2).

[0221] A discharge cover assembly (100, 200, 300) according to an embodiment of the present invention may include a third discharge cover (300) supported on a frame (50). The third discharge cover (300) may support a second discharge cover (200) on the frame (50).

[0222] The third discharge cover (300) may have a ring shape to include a portion that surrounds the outer circumference of the second discharge cover (200).

[0223] The third discharge cover (300) may include a cover body (310) that defines an insertion space (312) into which at least a portion of the second discharge cover (200) is inserted. The cover body (310) may have a roughly ring shape.

[0224] The cover body (310) may be configured to contact or support the outer surface of the second discharge cover (200). The cover body (310) may include an inner surface portion (311) that surrounds the cover flange (250) of the second discharge cover (200).

[0225] The inner surface portion (311) extends in the axial direction, and the axial length of the inner surface portion (311) can correspond, for example, to the axial length of the cover flange (250) of the second discharge cover (200).

[0226] The third discharge cover (300) can be fastened to the frame (50) by means of a fastening member, for example, a screw.

[0227] The third discharge cover (300) may include a cover flange (330) extending radially outward from the cover body (310). The cover flange (330) may include a support surface (331) supported by the frame (50). The support surface (331) may form the rear end of the third discharge cover (300).

[0228] The cover flange (330) may include a cover fastening hole (335) for fastening with the frame (50). The cover fastening hole (335) is formed by penetrating the cover flange (330), and a fastening member can be fastened to the frame (50) by penetrating the cover fastening hole (335).

[0229] Multiple cover flanges (330) are provided, and the third discharge cover (300) can be firmly fixed to the frame (50) through multiple cover flanges (330). For example, the multiple cover flanges (330) may include three cover flanges, but the number of cover flanges (330) is not limited thereto.

[0230] The third discharge cover (300) may include a protrusion support member (340) that supports a protrusion (233) of the second discharge cover (200). The protrusion support member (340) may be configured to protrude radially outward from the cover body (310) to accommodate at least a portion of the protrusion (233).

[0231] The third discharge cover (300) may include a terminal cover portion (351) that covers a terminal portion (not shown). The terminal portion is provided on the outer stator (41) and can be understood as a configuration that guides the power line to be drawn out to the outside of the outer stator (41). The terminal cover portion (351) may be configured to extend radially outward from the cover body (310) and cover the front end of the terminal portion.

[0232] The third discharge cover (300) may include a terminal leg (352) connected to the terminal cover portion (351). The terminal leg (352) may extend rearward from the terminal cover portion (351) to support the side of the terminal portion.

[0233] The third discharge cover (300) may include a cover bracket (353) that protrudes radially outward from the cover body (310) and is located opposite the terminal cover portion (351) with respect to the center of the third discharge cover (300). Through the cover bracket (353), the third discharge cover (300) can prevent the center of gravity from shifting toward the terminal cover portion (351).

[0234] Hereinafter, the detailed structure of the supporter (80) and the support cap member (90) coupled to the supporter (80) will be described with reference to FIGS. 10 to 13.

[0235] FIG. 10 is a perspective view of a supporter according to an embodiment of the present invention. FIG. 11 is an enlarged view of the C1 area of ​​FIG. 1. FIG. 12 is an upper perspective view of a support cap member according to an embodiment of the present invention. FIG. 13 is a lower perspective view of a support cap member according to an embodiment of the present invention.

[0236] Referring to FIGS. 10 to 13, a supporter (80) according to one embodiment may include a base portion (81) coupled to the rear side of a piston (70), an extension portion (82) extending rearward from the rear side of the base portion (81), and a spring support portion (83) protruding outwardly from the rear end of the extension portion (82).

[0237] The base portion (81) is positioned at the rear of the piston (70) to support the piston (70) forward. For example, the base portion (81) may have the shape of a disc plate.

[0238] The base portion (81) may include a first opening (81a) formed by penetrating the center. A muffler (26) may be disposed through the first opening (81a).

[0239] A piston (70) is supported on the front of the base portion (81), and an extension portion (82) extending rearward can be formed on the rear portion. Multiple extension portions (82) may be provided. For example, multiple extension portions (82) may be formed along the perimeter of the rear of the base portion (81), and each extension portion (82) may be formed with a uniform spacing.

[0240] Meanwhile, the base portion (81) may further include a second opening (81b) formed between adjacent extension portions (82) among a plurality of extension portions (82).

[0241] The extension portion (82) may have a shape that extends from the rear of the base portion (81) toward the rear. The extension portion (82) may include a reinforcing rib protruding toward the first opening (81a).

[0242] A spring support (83) protruding outwardly may be formed at the end of the extension (82). That is, the spring support (83) may be formed by protruding radially outward from the end of the extension (82). The spring support (83) may be positioned between the stator cover (32) and the rear cover (31). That is, the spring support (83) may be positioned at the rear of the stator cover (32) and at the front of the rear cover (31).

[0243] The spring support member (83) has a roughly ring shape and may include a cap insertion hole (83a) that is open in the front and rear directions. A support cap member (90) may be attached to the front and rear of the spring support member (83). For example, the support cap member (90) may be attached by press-fitting it into the cap insertion hole (83a).

[0244] The spring support (83) may include a first surface (831) forming a rear surface positioned toward the rear, a second surface (832) forming an inner surface defining a cap insertion hole (83a), a third surface (833) forming a front surface positioned toward the front, and a fourth surface (834) forming an outer surface.

[0245] A first resonant spring (30a) may be disposed on the first surface (831) of the spring support (83), and a second resonant spring (30b) may be disposed on the second surface (832).

[0246] A pair of support cap members (90) may be attached to the spring support member (83). The pair of support cap members (90) may be attached to the front and rear of the spring support member (83), respectively. For example, one of the pair of support cap members (90) may be placed on the first surface (831) of the spring support member (83) to support the first resonant spring (30a). Additionally, the other of the pair of support cap members (90) may be placed on the third surface (833) of the spring support member (83) to support the second resonant spring (30b). For convenience, the configuration in which the first resonant spring (30a) is supported among the pair of support cap members (90) may be referred to as the first support cap member (90), and the configuration in which the second resonant spring (30b) is supported may be referred to as the second support cap member (90).

[0247] A support cap member (90) according to one embodiment may include a cap support member (91) disposed on a first surface (831) or a third surface (833) of a spring support member (83), a cap insertion member (92) inserted into a cap insertion hole (83a), a cap extension member (93) bent and extended from an inner end of the cap support member (91), and a cap connection member (94) connecting one end of the cap extension member (93) and one end of the cap insertion member (92).

[0248] The cap support member (91) can be seated on the first surface (831) or the third surface (833) while the support cap member (90) is coupled to the spring support member (83). For example, the cap support member (91) may have a flange shape extending outward from the other end of the cap extension member (93).

[0249] The cap support member (91) may include a first support surface (911) supported by a first resonant spring (30a) or a second resonant spring (30b), and a second support surface (912) seated on a first surface (831) or a third surface (833) of the spring support member (83).

[0250] For example, if the first support surface (911) of the cap support (91) supports the first resonant spring (30a), the second support surface (912) can support the first surface (831) of the spring support (83). Additionally, if the first support surface (911) of the cap support (91) supports the second resonant spring (30b), the second support surface (912) can support the third surface (833) of the spring support (83).

[0251] The cap insertion portion (92) can be understood as being configured to be inserted into the cap insertion hole (83a) in the support cap member (90). The cap insertion portion (92) may be spaced apart from the inner side of the cap extension portion (93). The cap insertion portion (92) may include a first part (921) that forms an end and is spaced apart from the second surface (832) of the spring support portion (83), and a second part (922) that extends from the first part (921) outside the cap insertion hole (83a) and is supported by the second surface (832) of the spring support portion (83).

[0252] The first part (921) may be placed inside the cap insertion hole (83a). The first part (921) may be placed spaced apart from the second surface (832) of the spring support (83). The first part (921) may form the end of the cap insertion part (92).

[0253] Each first part (921) included in a pair of support cap members (90) coupled to a spring support member (83) can be spaced apart from each other.

[0254] By positioning the first part (921) apart from the second surface (832) of the spring support (83), the stress formed between the end of the cap insertion part (92) and the second surface (832) of the spring support (83) can be dispersed and reduced. Accordingly, it is possible to prevent the cap insertion part (92) from detaching from the cap insertion hole (83a) due to vibrations formed as the piston (70) reciprocates.

[0255] The second part (922) may be positioned over the inside and outside of the cap insertion hole (83a). For example, one end of the second part (922) connected to the first part (921) may be positioned inside the cap insertion hole (83a), and the other end connected to the cap connecting part (94) may be positioned outside the cap insertion hole (83a).

[0256] The second part (922) can be supported by the second surface (832) of the spring support (83). The support cap member (90) can be coupled to the spring support (83) by being pressed into the cap insertion hole (83a) so that the second part (922) is supported by the second surface (832) of the spring support (83).

[0257] The outer surface of the second part (922) supported by the second surface (832) of the spring support member (83) and the second support surface (912) of the cap support member (91) are spaced apart from each other and can be extended in an intersecting direction.

[0258] Meanwhile, the support cap member (90) may include a recessed groove (95) that is recessed in a direction away from the spring support member (83). The recessed groove (95) may be formed between the cap insertion part (92) and the cap extension part (93).

[0259] Additionally, the spacing groove (95) may extend to the area between the cap support (91) and the cap insertion part (92). That is, the cap support (91) and the cap insertion part (92) may be spaced apart from each other.

[0260] A support cap member (90) according to one embodiment can reduce the stress formed when the cap insertion part (92) is pressed into and coupled to the cap insertion hole (83a) of the spring support part (83) through a spacing groove (95) formed between the cap insertion part (92) and the cap extension part (93). That is, through the spacing groove (95), the cap support part (91) supported by the resonant spring (30) and the cap insertion part (92) pressed into and coupled to the cap insertion hole (83a) of the spring support part (83) can be spaced apart so that the stress applied to each can be separated. Through this, the stress applied to the cap insertion part (92) can be reduced by minimizing the transmission of the stress applied to the cap support part (91) by the resonant spring (30) to the cap insertion part (92). Therefore, even if the internal temperature rises while the linear compressor (10) is operating, the support cap member (90) can be prevented from falling off the spring support member (83).

[0261] A support cap member (90) according to one embodiment may include a cap member hole (90a) that is open in the front-rear direction. The cap member hole (90a) may be defined by the inner surface of the cap insertion part (92). The support cap member (90) can improve compression efficiency by minimizing resistance that may occur during the reciprocating linear motion of the piston (70) through the cap member hole (90a).

[0262] The cap extension portion (93) may be formed by extending to one side from the inner end of the cap support portion (91). For example, the cap extension portion (93) may extend from the inner end of the cap support portion (91) in a direction away from the spring support portion (83). The cap extension portion (93) may extend in the same direction as the cap insert portion (92). The cap extension portion (93) may be spaced apart from the outside of the cap insert portion (92). As described above, a spacing groove (95) may be formed between the cap extension portion (93) and the cap insert portion (92).

[0263] A resonant spring (30) can be supported on the outer surface of the cap extension (93). That is, the cap extension (93) can be inserted into the interior of the resonant spring (30). The cap extension (93) supports the inner surface of the resonant spring (30) to prevent the resonant spring (30) from falling off the support cap member (90).

[0264] The cap extension portion (93) and the cap insert portion (92) can be connected by a cap connecting portion (94). For example, the cap connecting portion (94) can connect one end of the cap insert portion (92) and one end of the cap extension portion (93). The cap connecting portion (94) can be inserted and positioned inside the resonant spring (30). The cap connecting portion (94) may include an outer surface that slopes inward toward one side. Through this, the cap connecting portion (94) can be positioned spaced apart from the resonant spring (30).

[0265] Through the above structure, the resonant spring (30) is configured to be supported on the outer surface of the cap extension (93) but not on the outer surface of the cap connection (94), thereby minimizing mechanical losses during the reciprocating linear motion of the piston (70) and improving compression efficiency.

[0266] According to an embodiment of the present invention, a support cap member (90) provided for supporting a resonant spring (30) may be formed such that the cap insertion part (92) and the cap support part (91) are spaced apart through a spacing groove (95). This reduces the stress formed by the support cap member (90) being pressed into the spring support part (83) of the supporter (80). Therefore, it is possible to prevent the support cap member (90) from falling off even with temperature changes due to the operation of the linear compressor (10).

[0267] According to an embodiment of the present invention, the compression efficiency of a compressor can be improved by improving the thermal insulation structure of the discharge cover to reduce the amount of heat transfer from the discharge cover to the frame and preventing the suction temperature of the refrigerant from rising excessively, and thus industrial applicability is recognized.

[0268] According to an embodiment of the present invention, by configuring a discharge cover through which high-temperature discharge gas flows with a material having a low heat transfer coefficient, the temperature of the discharge cover can be effectively lowered, and thus industrial applicability is recognized.

[0269] According to an embodiment of the present invention, by lowering the temperature of the discharge cover, it is possible to prevent high-temperature heat from being transferred to the frame connected to the discharge cover, and thus industrial applicability is recognized.

[0270] According to an embodiment of the present invention, some of the discharge covers forming the discharge chamber among a plurality of discharge covers are composed of a non-metallic material having a low heat transfer coefficient, thereby reducing the amount of heat transferred to the frame, and thus industrial applicability is recognized.

[0271] In addition, since the other discharge cover connected to the frame is made of a metal material, it is possible to prevent defects in the connection between the discharge cover and the frame caused by thermal shrinkage, thus industrial applicability is recognized.

[0272] According to an embodiment of the present invention, by configuring a plurality of discharge covers by stacking them and firmly fixing the plurality of discharge covers, the magnitude of vibration or noise generated during the refrigerant discharge process can be reduced, and thus industrial applicability is recognized.

[0273] According to an embodiment of the present invention, by press-fitting and fixing a plurality of discharge covers, a robust fixation between discharge covers can be achieved without a separate fastening member, and thus industrial applicability is recognized.

[0274] According to an embodiment of the present invention, by installing a damping member in the area where a plurality of discharge covers are pressed in, the fixing force between the discharge covers can be increased and the magnitude of the valve tapping sound generated during the opening and closing process of the discharge valve can be reduced, thus industrial applicability is recognized.

[0275] According to an embodiment of the present invention, pulsating noise can be reduced by installing a damping member on a first discharge cover among a plurality of discharge covers to form a pulsating flow path, and thus industrial applicability is recognized.

[0276] According to an embodiment of the present invention, the stress formed by press-fitting into a supporter through a spacing groove formed in a support cap member provided for supporting a resonant spring can be reduced. This prevents the support cap member from detaching due to temperature changes in the linear compressor, thereby demonstrating industrial applicability.

Claims

1. A discharge cover assembly that supports a discharge valve and forms a discharge chamber for the refrigerant discharged through the discharge valve; A frame supporting the above discharge cover assembly; A cylinder supported inside the above frame; A piston inserted into the cylinder and reciprocating in the forward and backward directions; A supporter comprising a base portion coupled to the rear of the piston and a spring support portion formed extending rearward from the base portion; and A linear compressor comprising a support cap member coupled to the spring support and including a spacing groove recessed in a direction away from the spring support.

2. In Paragraph 1, The above support cap member is, A cap support member supported on a first surface positioned toward the front or rear of the spring support member, and A linear compressor comprising a cap insertion portion connected to the cap support portion and spaced apart and disposed on the inner side of the cap support portion with the spaced groove in between.

3. In Paragraph 2, The above-mentioned spacing groove is a linear compressor disposed between the cap support and the cap insertion part.

4. In Paragraph 2, The above support cap member is, A cap extension extending in a direction away from the spring support at the inner end of the cap support, and It further includes a cap connecting portion connecting one end of the cap insertion portion and one end of the cap extension portion, The above-mentioned spacing groove is a linear compressor disposed between the cap extension and the cap insertion part.

5. In Paragraph 4, A linear compressor further comprising a resonant spring that is supported by the cap support and arranged to surround the outer surface of the cap extension.

6. In Paragraph 5, The above cap support is, A first support surface supporting the above-mentioned resonant spring, and It includes a second support surface that supports the first surface of the spring support portion, A linear compressor in which the first support surface and the second support surface are arranged facing opposite directions.

7. In Paragraph 2, The above spring support is, It includes a second surface that intersects the first surface and defines a cap insertion hole that is opened so that the cap insertion portion is press-fitted and coupled, The above cap insertion part is, A first part spaced apart from the second surface, forming an end portion disposed inside the cap insertion hole, and A linear compressor comprising a second part connected to the first part and supported on the second surface.

8. In Paragraph 7, The above second part is, A linear compressor extending toward the outside of the cap insertion hole and positioned across the inside and outside of the cap insertion hole.

9. In Paragraph 7, It further includes a resonant spring supported by the above-mentioned cap support, The above cap support is, A first support surface supporting the above-mentioned resonant spring, and It includes a second support surface that supports the first surface of the spring support portion, A linear compressor in which the first support surface and the second support surface are arranged facing opposite directions.

10. In Paragraph 9, A linear compressor in which the outer surface of the second part and the second support surface are spaced apart from each other and extend in an intersecting direction.

11. In Paragraph 1, The above spring support includes an open cap insertion hole, and The above support cap member is, A cap support member supported on a first surface positioned toward the front or rear of the spring support member, and A linear compressor comprising a cap insertion part that is spaced apart and disposed on the inner side of the cap support part with the above-mentioned spacing groove in between, and configured to be pressed into and coupled with the cap insertion hole.

12. In Paragraph 1, An outer stator fixed to the rear of the frame and positioned to surround the cylinder; and A stator cover positioned at the rear of the above outer stator; and It further includes a rear cover coupled to the stator cover and extending rearward, The above spring support is a linear compressor disposed between the stator cover and the rear cover.

13. In Paragraph 12, A first resonant spring supported between the spring support and the rear cover, and A linear compressor further comprising a second resonant spring supported between the spring support and the stator cover.

14. In Paragraph 13, The above support cap member is, A first support cap member coupled to one side of the spring support member to support the first resonant spring, and A linear compressor comprising a second support cap member coupled to the other side of the spring support member and supporting the second resonant spring.

15. In Paragraph 1, The above frame is made of metal material, and The above discharge cover assembly is, A first discharge cover forming a first discharge chamber for refrigerant, and It includes a second discharge cover coupled to the first discharge cover and forming a discharge chamber for the refrigerant discharged from the first discharge chamber, and The first and second discharge covers are each supported to be in contact with the frame, and The first and second discharge covers are made of a non-metallic material to reduce the amount of heat transferred from the first and second discharge covers to the frame, and The above-mentioned first discharge cover is, A discharge hole for discharging refrigerant to the first discharge chamber; and It includes a recessed portion into which the refrigerant discharged from the above discharge hole is introduced and the second discharge cover is coupled, The above second discharge cover is, An outer wall forming a space into which the first discharge cover is inserted, and It includes an inner wall that protrudes from the inner surface of the outer wall and is coupled to the first discharge cover, The discharge chamber of the second discharge cover above is, Defines an inner discharge chamber of the inner wall and a second discharge chamber connected to the first discharge chamber, and A linear compressor comprising a third discharge chamber defining an outer discharge chamber of the inner wall.

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