Linear compressor

Abstract

The present invention relates to a linear compressor. The linear compressor according to an embodiment of the present invention comprises: a shell forming an inner space; a first shell cover coupled to one side of the shell; a second shell cover coupled to the other side of the shell; and a main body disposed in the inner space, wherein the main body comprises: a first discharge cover supporting a discharge valve and forming a first discharge chamber for a refrigerant discharged through the discharge valve; a second discharge cover coupled to the first discharge cover, forming a second discharge chamber for the refrigerant discharged from the first discharge chamber, and having a front end portion facing the first shell cover; and a cap member coupled to the front end portion of the second discharge cover.

Description

Linear compressor

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

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

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

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

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

[0006] Meanwhile, in a linear compressor, a problem may occur in which the discharge cover and the shell cover coupled to one side of the shell come into contact and generate noise under cold air overload conditions. Therefore, it is necessary to reduce the noise caused by the contact between the discharge cover and the shell cover.

[0007] (Patent Document 1) Korean Registered Patent Publication 10-2357601 (January 26, 2022), Title of Invention: Linear Compressor

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] The present invention aims to provide a linear compressor capable of reducing the pulsation of the discharged gas by forming the diameter of the pulsation path to be larger than the diameter of the flexible loop pipe.

[0017] The present invention aims to provide a linear compressor capable of reducing discharge pulsation by reinforcing the strength of a discharge cover that defines a discharge chamber by providing reinforcing ribs on the discharge cover and acting as resistance to the discharge path flowing through the discharge chamber.

[0018] The present invention aims to reduce noise generated when in contact with a shell cover by mounting a cap member on a second discharge cover.

[0019] A linear compressor according to an embodiment of the present invention for solving the above problem comprises: a shell forming an internal space; a first shell cover coupled to one side of the shell; a second shell cover coupled to the other side of the shell; and a main body disposed within the internal space, wherein the main body comprises: a first discharge cover that supports a discharge valve and forms a first discharge chamber for refrigerant discharged through the discharge valve; a second discharge cover coupled to the first discharge cover, forming a second discharge chamber for refrigerant discharged from the first discharge chamber, and including a front portion facing the first shell cover; and a cap member coupled to the front portion of the second discharge cover.

[0020] The second discharge cover comprises a cover body forming the second discharge chamber, and a cover extension extending forward from the front end of the cover body and forming the front end of the second discharge cover, wherein the cap member may be coupled to the cover extension.

[0021] The above cap member includes a front portion positioned opposite the first shell cover and a side portion extending rearward along the perimeter of the front portion, wherein the front portion may include a cushioning portion protruding forward.

[0022] The above-mentioned side portion includes a first side insertion portion protruding toward the cover extension portion, and the cover extension portion is formed on an outer surface and may include a first side coupling hole into which the first side insertion portion is inserted.

[0023] The device further includes a support device that supports the first discharge cover and the second discharge cover, wherein the first side insertion portion includes a side insertion hole that is open toward the cover extension portion, and the support device can be coupled to the first side coupling hole through the side insertion hole.

[0024] The above side portion protrudes toward the cover extension portion and further includes a second side insert portion positioned at the front and rear of the first side insert portion, wherein the first side insert portion protrudes further than the second side insert portion, and the cover extension portion is formed on an outer surface and includes a second side coupling hole into which the second side insert portion is inserted, wherein the second side coupling hole may be positioned at the front and rear of the first side coupling hole.

[0025] The above cap member further includes an insertion hole formed by opening on the side portion, and the cover extension portion may include an insertion projection formed on the outer surface and inserted into the insertion hole.

[0026] In the above-mentioned cap member, the insertion hole and the first side insertion part may be located on opposite sides of each other.

[0027] The above cap member further includes a front insertion portion protruding rearward from the rear of the front portion, wherein the cover extension portion is formed by being recessed rearward from the front portion and may include a front coupling hole into which the front insertion portion is inserted.

[0028] The end of the front insertion part and the bottom surface of the front coupling hole facing the front insertion part may be spaced apart from each other.

[0029] The above cap member may be formed of a rubber material.

[0030] The above main body may further include a frame supporting the first discharge cover and the second discharge cover, and a cylinder supported inside the frame and into which a piston that reciprocates in the axial direction is inserted.

[0031] The second discharge cover comprises a cover body forming the second discharge chamber and a cover flange provided at the rear end of the cover body and supported by the frame, wherein the outer wall of the cover body may include a first part connected to the cover flange and a second part extending forward from the front end of the first part.

[0032] The second discharge cover further includes a cover extension extending forward from the front end of the second part, and the cap member can be coupled to the cover extension.

[0033] The above cap member comprises a front portion including a cushioning portion protruding forward and positioned opposite the first shell cover, a side portion including a first side insertion portion extending rearward along the periphery of the front portion and protruding toward the cover extension portion, and an insertion hole formed by opening on the side portion and formed on the opposite side of the first side insertion portion, wherein the cover extension portion may include a first side coupling hole formed on the outer surface into which the first side insertion portion is inserted, and an insertion projection formed on the outer surface into which the insertion hole is inserted.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] According to an embodiment of the present invention, the pulsation of the discharged gas can be reduced by forming the diameter of the pulsation path larger than the diameter of the flexible loop pipe.

[0044] According to an embodiment of the present invention, a discharge cover defining a discharge chamber is provided with reinforcing ribs to reinforce the strength of the discharge cover and act as a resistance to the discharge path flowing through the discharge chamber, thereby reducing discharge pulsation.

[0045] According to an embodiment of the present invention, a cap member is mounted on the second discharge cover to reduce noise generated when in contact with the shell cover.

[0046] FIG. 1 is a cross-sectional view of a linear compressor according to an embodiment of the present invention.

[0047] Figure 2 is a cross-sectional view taken along 2-2 of Figure 1.

[0048] FIG. 3 is a cross-sectional view showing the configuration of a discharge cover assembly according to an embodiment of the present invention.

[0049] FIG. 4 is an upper perspective view of a first discharge cover according to an embodiment of the present invention.

[0050] FIG. 5 is a lower perspective view of a first discharge cover according to an embodiment of the present invention.

[0051] FIG. 6 is an upper perspective view of a damping member according to an embodiment of the present invention.

[0052] FIG. 7 is an upper perspective view of a second discharge cover according to an embodiment of the present invention.

[0053] FIG. 8 is an upper perspective view of a third discharge cover according to an embodiment of the present invention.

[0054] 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.

[0055] Figure 10 is an enlarged view of the C1 region of Figure 2.

[0056] Figure 11 is an enlarged view of the C2 region of Figure 3.

[0057] FIGS. 12 and FIGS. 13 are perspective views of a cap member according to an embodiment of the present invention.

[0058] 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.

[0059] 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.

[0060] FIG. 1 is a cross-sectional view of a linear compressor according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along 2-2 of FIG. 1. FIG. 3 is a cross-sectional view showing the configuration of a discharge cover assembly according to an embodiment of the present invention.

[0061] 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).

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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).

[0066] 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).

[0067] The linear compressor (10) may further include support devices (20, 90) that are positioned on both sides of the shell (11) and support the main body of the linear compressor (10). The support devices (20, 90) 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 (90) that is coupled to the second shell cover (13) and supports the discharge cover assembly (100, 200, 300).

[0068] 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 (33), 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 (90), etc.

[0069] 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).

[0070] 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.

[0071] 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.

[0072] 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).

[0073] 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.

[0074] The linear compressor (10) may include a motor assembly (41, 43, 45) as a linear motor that provides driving force to the piston (70).

[0075] 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).

[0076] 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).

[0077] 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.

[0078] 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.

[0079] 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).

[0080] The linear compressor (10) may further include a supporter (33) that supports the piston (70). The supporter (33) 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 (33) may be connected by a fastening member.

[0081] 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 (33).

[0082] The rear cover (31) may include a plurality of support legs that are coupled to the rear of the stator cover (32).

[0083] 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).

[0084] 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.

[0085] A plurality of resonant springs (30) may include a plurality of first resonant springs supported between the supporter (33) and the stator cover (32), and a plurality of second resonant springs supported between the supporter (33) and the rear cover (31). 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.

[0086] 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).

[0087] 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).

[0088] A cylinder sealing member (82) may be provided between the frame (50) and the cylinder (60). By means of the cylinder sealing member (82), the sealing force may be increased during the press-fitting process between the frame (50) and the cylinder (60). The cylinder sealing member (82) 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.

[0089] 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).

[0090] Defines the direction.

[0091] "Axial direction" can be understood as the direction in which the piston (70) reciprocates, i.e., the up-and-down direction in FIG. 2. 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.

[0092] 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. 2.

[0093] 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.

[0094] 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.

[0095] 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).

[0096] 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).

[0097] 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.

[0098] 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).

[0099] 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).

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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).

[0105] The damping member (180) is mounted in the recess (140, see FIG. 4) of the first discharge cover (100), and the inner wall (238, see FIG. 9) 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.

[0106] 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.

[0107] The detailed structure of the damping member (180) will be described later with reference to FIG. 6.

[0108] Meanwhile, the linear compressor (10) may have a problem where noise is generated when the second discharge cover (200) and the second shell cover (13) come into contact under cold operation overload conditions. Therefore, the linear compressor (10) may include a cap member (285) to prevent noise generated when the second discharge cover (200) and the second shell cover (13) come into contact. The cap member (285) may be attached to the front end of the third part (240) of the second discharge cover (200). For example, the cap member (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).

[0109] A detailed description of the cap member (285) will be given later with reference to FIGS. 10 to 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 (81) 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 (81) 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 (83) may be provided between the sealing bracket (197) and the flange of the cylinder (60). The bracket sealing member (83) 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 first discharge chamber (A2) of the second discharge cover (200).

[0127] The first 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) is inserted into the recess (140) of the first discharge cover (100), and a damping member (180) is interposed in the area where the inner wall (238) 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) can be understood as a partition wall that divides the discharge chambers (A2, A3) of the second discharge cover (200) into the first discharge chamber (A2) and the second discharge chamber (A3). The second 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 first and second 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 port (280) of the second discharge cover (200). Accordingly, the refrigerant of the third discharge chamber (A3) can be discharged to the outside of the second discharge cover (200) through the discharge port (280) and discharged to the discharge pipe of the shell (11) through the loop pipe (290).

[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 FIGS. 4 and FIGS. 5 together with FIGS. 2 and FIGS. 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).

[0139] 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 a cover flange (150). The first and second parts (111a, 111b) may be arranged axially. The first part (111a) and the second part (111b) may have a cylindrical shape by extending in a rounded manner in the circumferential direction.

[0140] 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).

[0141] 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).

[0142] 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).

[0143] 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).

[0144] 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).

[0145] 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.

[0146] 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).

[0147] 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.

[0148] 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.

[0149] The linear compressor (10) may further include a loop pipe (290, see FIG. 7) as a configuration for reducing pulsation. The loop pipe (290) is a pulsation pipe extending from the discharge cover assembly (100, 200, 300) to the discharge pipe of the shell (11) and may be made of a flexible material to reduce pulsation noise.

[0150] The recess (140) of the first discharge cover (100) forms an additional pulsating pipe in addition to the loop pipe (290), and can be understood as forming a pulsating flow path inside the recess (140).

[0151] 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).

[0152] In the recess (140), a support projection (139, 111d) for supporting the damping member (180) may be provided.

[0153] 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).

[0154] 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).

[0155] 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.

[0156] 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).

[0157] 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).

[0158] 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).

[0159] 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).

[0160] 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".

[0161] 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).

[0162] The recess (113a) can be connected to the second discharge chamber (A3) of the second discharge cover (200).

[0163] 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.

[0164] 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).

[0165] 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).

[0166] 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.

[0167] At least a portion of the second discharge cover (200), for example, an inner wall (238), may be coupled to the damping member (180). The inner wall (238) may have a ring shape corresponding to the damping member (180).

[0168] By combining the inner wall (238) and the damping member (180), the internal space of the second discharge cover (200) can be divided into a plurality of discharge chambers (A2, A3, see FIG. 3).

[0169] 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).

[0170] 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.

[0171] The reinforcing rib (135) can be configured to protrude from the inner surface of the first discharge cover (100).

[0172] 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.

[0173] 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).

[0174] By the configuration of the first and second parts, the reinforcing rib (135) can be configured to be bent or rounded.

[0175] 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.

[0176] 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).

[0177] 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).

[0178] The connecting rib (136) can be positioned further back than the bottom surface of the depression (140).

[0179] 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).

[0180] 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.

[0181] 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).

[0182] 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).

[0183] 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.

[0184] 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.

[0185] 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).

[0186] 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).

[0187] 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.

[0188] 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).

[0189] 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).

[0190] FIG. 6 is an upper perspective view of a damping member according to an embodiment of the present invention.

[0191] Referring to FIG. 6 together with FIG. 2 and 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).

[0192] 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.

[0193] 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).

[0194] 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).

[0195] The bottom surface of the groove (184) can connect the rear end of the inner surface (182) and the outer surface (183).

[0196] 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).

[0197] 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.

[0198] 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).

[0199] The damping member (180) can reduce vibrations occurring between the first discharge cover (100) and the second discharge cover (200).

[0200] 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).

[0201] 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.

[0202] Referring to FIGS. 7 through 9 together with FIGS. 2 and 3, 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).

[0203] 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).

[0204] 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).

[0205] 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).

[0206] The first part (220) can be extended in a rounded direction to have a cylindrical shape.

[0207] The second part (230) may extend axially from the first part (220). The second part (230) may be formed stepwise from the first part (220). The size of the second part (230) may be formed smaller than the size of the first part (220). For example, the outer diameter or inner diameter of the second part (230) may be formed smaller than the outer diameter or inner diameter of the first part (220).

[0208] 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).

[0209] 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). The discharge hole (280) may be formed by being recessed from the side of the protrusion (233) and penetrating to the shear wall (228) of the first part (220).

[0210] 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).

[0211] 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).

[0212] The loop pipe (290) can perform the function of reducing the pulsation of the discharge gas. That is, the loop pipe (290) can 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).

[0213] 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).

[0214] A plurality of grooves (234a, 234b) may include a first groove (234a) that is recessed from the outermost radial surface of the protrusion (233) and a second groove (234b) formed on a contact surface (234c) that contacts the frame (50). The contact surface (234c) forms the rear end of the protrusion (233) and may be supported by the frame (50).

[0215] 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.

[0216] The second groove (234b) may include a plurality of grooves that are recessed forward from the contact surface (234c). The plurality of grooves of the second groove (234b) may be aligned in a circumferential direction.

[0217] 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). The third part (240) may be located adjacent to the second shell cover (13). As described above, a cap member (285) may be attached to one end of the third part (240) to reduce noise that may occur when the second discharge cover (200) and the second shell cover (13) come into contact under cold operation overload conditions.

[0218] 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.

[0219] 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.

[0220] 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.

[0221] 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).

[0222] 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).

[0223] 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).

[0224] 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).

[0225] 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).

[0226] 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.

[0227] 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).

[0228] 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).

[0229] The second discharge cover (200) may include reinforcing ribs (227, 237) to reinforce the strength of the cover made of a non-metallic material. The reinforcing ribs (227, 237) are provided in the discharge chamber of the second discharge cover (200) and act as a resistance to the flow path of the refrigerant, thereby reducing the discharge pulsation of the refrigerant.

[0230] The reinforcing ribs (227, 237) may include a first reinforcing rib (227) provided on the inner surface of the first part (220) and a second reinforcing rib (237) provided on the inner surface of the second part (230). A plurality of the first reinforcing rib (227) and the second reinforcing rib (237) may each be provided.

[0231] A plurality of first reinforcing ribs (227) may be spaced apart from each other in the circumferential direction of the first part (220). By arranging the plurality of first reinforcing ribs (227), strength reinforcement in the axial and radial directions of the first part (220) can be achieved.

[0232] A plurality of second reinforcing ribs (237) may be spaced apart from each other in the circumferential direction of the second part (230). By arranging the plurality of second reinforcing ribs (237), strength reinforcement in the axial and radial directions of the second part (230) can be achieved.

[0233] A plurality of first reinforcing ribs (227) act as flow resistance for the refrigerant flowing through the third discharge chamber (A3), and a plurality of second reinforcing ribs (237) act as flow resistance for the refrigerant flowing through the second discharge chamber (A2), thereby reducing the pulsation noise of the refrigerant.

[0234] 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).

[0235] 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).

[0236] 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.

[0237] 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).

[0238] 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).

[0239] The third discharge cover (300) can be fastened to the frame (50) by means of a fastening member, for example, a screw.

[0240] 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).

[0241] 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).

[0242] 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.

[0243] 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).

[0244] 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.

[0245] 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.

[0246] 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).

[0247] Hereinafter, the mounting structure of a cap member (285) coupled to one end of the third part (240) of the second discharge cover (200) will be described.

[0248] FIG. 10 is an enlarged view of region C1 of FIG. 2. FIG. 11 is an enlarged view of region C2 of FIG. 3. FIG. 12 and FIG. 13 are perspective views of a cap member according to an embodiment of the present invention.

[0249] Referring to FIGS. 10 to 13, the linear compressor (10) may include a cap member (285) coupled to the front end of the third part (240) to prevent noise generated when the second discharge cover (200) and the second shell cover (13) come into contact. For example, the cap member (285) may be made of an elastic material. The cap member (285) may be made of a rubber material.

[0250] The cap member (285) may include a front portion (2851) positioned toward the second shell cover (13) and a side portion (2853) extending rearward along the perimeter of the front portion (2851).

[0251] The front portion (2851) may be positioned on the front portion of the third part (240) of the second discharge cover (200). The front portion (2851) may be positioned opposite the rear surface of the second shell cover (13).

[0252] The front portion (2851) may include a buffer portion (2852) protruding forward. The buffer portion (2852) can be understood as a part of the front portion (2851) that has a greater thickness in the front-rear direction than the surrounding area. For example, the buffer portion (2852) may be formed to have a greater thickness toward the center of the cap member (285). That is, the front of the buffer portion (2852) may have a shape that is rounded forward as it approaches the center of the cap member (285).

[0253] The buffer (2852) can mitigate the shock that occurs when the second discharge cover (200) and the second shell cover (13) come into contact under cold drive overload conditions. Therefore, the noise that occurs when the cap member (285) and the second shell cover (13) come into contact can be reduced.

[0254] The cap member (285) may include a front insertion portion (2856) formed by protruding backward on the rear surface of the front portion (2851). The front insertion portion (2856) may be partially inserted into the third part (240). For example, the third part (240) may include a first coupling hole (241) into which the front insertion portion (2856) is inserted. For example, the first coupling hole (241) may be formed at the front end of the third part (240). The first coupling hole (241) may be formed by the front end of the third part (240) being recessed backward. That is, the front insertion portion (2856) of the cap member (285) is inserted into the first coupling hole (241), so that the second discharge cover (200) and the cap member (285) can be easily coupled.

[0255] The front insertion portion (2856) may be spaced apart from the inner surface of the first coupling hole (241). For example, the end of the front insertion portion (2856) may be spaced apart from the bottom surface of the first coupling hole (241). That is, a spaced gap may be formed between the end of the front insertion portion (2856) and the bottom surface of the first coupling hole (241).

[0256] When the second discharge cover (200) and the second shell cover (13) come into contact, the cushioning portion (2852) is pressed backward, allowing the front insertion portion (2856) to move backward. According to an embodiment of the present invention, when the second discharge cover (200) and the second shell cover (13) come into contact through the above structure, a clearance space can be provided for the front insertion portion (2856) to move backward. Accordingly, by structurally preventing the end of the front insertion portion (2856) from coming into contact with the bottom surface of the first coupling hole (241), noise that may be generated by the contact between the second discharge cover (200) and the second shell cover (13) can be reduced.

[0257] The side portion (2853) may have a shape extending rearward from the edge of the front portion (2851). The side portion (2853) may be positioned to surround the side of the third part (240). For example, the side portion (2853) may have a roughly cylindrical shape.

[0258] The side portion (2853) may include a first side insertion portion (2854) formed on one side and an insertion hole (2857) formed on the other side. For example, the first side insertion portion (2854) and the insertion hole (2857) may be formed on opposite sides.

[0259] The first side insertion part (2854) may be formed such that one side of the side part (2853) protrudes toward the third part (240). The first side insertion part (2854) may be inserted into the outer surface of the third part (240). For example, the third part (240) may include a second coupling hole (242) into which the first side insertion part (2854) is inserted. The second coupling hole (242) is formed on the outer surface of the third part (240), and at least a portion of the second support device (90) may be coupled to the second coupling hole (242) to support the discharge cover assembly (100, 200, 300).

[0260] Meanwhile, the first side insertion portion (2854) may include a side insertion hole (2854a) that is open toward the second coupling hole (242). At least a portion of the second support device (90) may be coupled to the second coupling hole (242) through the side insertion hole (2854a).

[0261] The side portion (2853) may further include a second side insert (2855) positioned at the front and rear of the first side insert (2854). The second side insert (2855) may be formed such that one side of the side portion (2853) protrudes toward the third part (240). The first side insert (2854) may be formed to protrude further than the second side insert (2855). The second side insert (2855) may be formed to form a structure corresponding to the shape of the third part (240).

[0262] For example, the third part (240) may include a third coupling hole (243) positioned at the front and rear of the second coupling hole (242). The third coupling hole (243) is formed on the outer surface of the third part (240) and may be formed radially outward from the second coupling hole (242). A second side insertion part (2855) is inserted into the third coupling hole (243), so that the second discharge cover (200) and the cap member (285) can be easily coupled.

[0263] The insertion hole (2857) may be formed by partially opening the side portion (2853). For example, the insertion hole (2857) may be positioned on the opposite side of the first side insertion portion (2854). The third part (240) may be partially inserted into the insertion hole (2857).

[0264] For example, the third part (240) may include an insertion projection (244) formed on the outer surface. The insertion projection (244) may be inserted into the insertion hole (2857) of the cap member (285). The insertion projection (244) may be positioned on the opposite side of the second coupling hole (242). That is, the insertion projection (244) is inserted into the insertion hole (2857), so that the second discharge cover (200) and the cap member (285) can be easily coupled.

[0265] A first coupling hole (241) into which the front insertion part (2856) of the cap member (285) is inserted may be formed in the front portion of the third part (240). On one side of the outer surface of the third part (240), a second coupling hole (242) and a third coupling hole (243) into which the first side insertion part (2854) and the second side insertion part (2855) of the cap member (285) are respectively inserted may be formed. On the other side of the outer surface of the third part (240), an insertion projection (244) configured to be inserted into the insertion hole (2857) of the cap member (285) may be formed.

[0266] According to an embodiment of the present invention, a cap member (285) is attached to the front end of the second discharge cover (200) to reduce noise generated when in contact with the second shell cover (13).

[0267] According to an embodiment of the present invention, the cap member (285) can be firmly coupled to the second discharge cover (200) so that it does not detach from the second discharge cover (200) even when the cap member (285) repeatedly comes into contact with the second shell cover (13).

[0268] 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.

[0269] 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.

[0270] 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.

[0271] 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.

[0272] 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.

[0273] 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.

[0274] 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.

[0275] 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.

[0276] 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.

[0277] According to an embodiment of the present invention, by forming the diameter of the pulsation path larger than the diameter of the flexible loop pipe, the pulsation of the discharged gas can be reduced, and thus industrial applicability is recognized.

[0278] According to an embodiment of the present invention, a discharge cover defining a discharge chamber is provided with reinforcing ribs to reinforce the strength of the discharge cover and act as a resistance to the discharge path flowing through the discharge chamber, thereby reducing discharge pulsation, and thus industrial applicability is recognized.

[0279] According to an embodiment of the present invention, a cap member is mounted on the second discharge cover to reduce noise generated upon contact with the shell cover, and thus industrial applicability is recognized.

Claims

1. A shell forming an internal space; A first shell cover coupled to one side of the above shell; A second shell cover coupled to the other side of the above shell; It includes a main body disposed within the above internal space, The above main body is, A first discharge cover that supports a discharge valve and forms a first discharge chamber for the refrigerant discharged through the discharge valve, A second discharge cover coupled to the first discharge cover, forming a second discharge chamber for the refrigerant discharged from the first discharge chamber, and including a front portion facing the first shell cover, and A linear compressor comprising a cap member coupled to the front portion of the second discharge cover.

2. In Paragraph 1, The above second discharge cover is, A cover body forming the second discharge chamber, and It includes a cover extension portion that extends forward from the front end of the cover body and forms the front end portion of the second discharge cover, The above cap member is a linear compressor coupled to the above cover extension.

3. In Paragraph 2, The above cap member is, A front portion positioned opposite the first shell cover, and It includes a side portion extending rearward along the perimeter of the front portion, The above-mentioned front portion is a linear compressor including a buffer portion protruding forward.

4. In Paragraph 3, The above-mentioned side portion includes a first side insert portion protruding toward the cover extension portion, and A linear compressor having a cover extension formed on an outer surface and a first side coupling hole into which the first side insertion part is inserted.

5. In Paragraph 4, The device further includes a support device that supports the first discharge cover and the second discharge cover, The first side insertion portion includes a side insertion hole that is open toward the cover extension portion, and The above support device is a linear compressor coupled to the first side coupling hole through the side insertion hole.

6. In Paragraph 4, The above-mentioned side portion protrudes toward the cover extension portion and further includes a second side insert portion positioned at the front and rear of the first side insert portion, wherein The first side insertion part protrudes further than the second side insertion part, and The above-mentioned cover extension is formed on the outer surface and includes a second side coupling hole into which the second side insertion part is inserted, The second side coupling hole is a linear compressor positioned at the front and rear of the first side coupling hole.

7. In Paragraph 4, The above cap member further includes an insertion hole formed by opening on the side portion, wherein A linear compressor comprising a cover extension formed on an outer surface and an insertion projection inserted into the insertion hole.

8. In Paragraph 7, In the above cap member, A linear compressor in which the insertion hole and the first side insertion part are located on opposite sides of each other.

9. In Paragraph 3, The above-described cap member further includes a front insertion portion protruding rearward from the rear of the front portion, wherein A linear compressor comprising a cover extension portion formed by being recessed backward from the front portion, and a front coupling hole into which the front insert portion is inserted.

10. In Paragraph 9, A linear compressor in which the end of the front insertion part and the bottom surface of the front coupling hole facing the front insertion part are spaced apart from each other.

11. In Paragraph 3, The above-mentioned cap member is a linear compressor formed of rubber material.

12. In Paragraph 1, The above main body is, A frame supporting the first discharge cover and the second discharge cover, and A linear compressor further comprising a cylinder into which a piston that reciprocates axially is inserted, supported inside the above frame.

13. In Paragraph 12, The above second discharge cover is, A cover body forming the second discharge chamber, and It includes a cover flange provided at the rear end of the cover body and supported by the frame, wherein The outer wall of the above cover body is, A linear compressor comprising a first part connected to the cover flange and a second part extending forward from the front portion of the first part.

14. In Paragraph 13, The above second discharge cover is, It further includes a cover extension extending forward from the shear portion of the second part above, and The above cap member is a linear compressor coupled to the above cover extension.

15. In Paragraph 14, The above cap member is, A front portion including a buffer portion protruding forward and positioned opposite the first shell cover, A side portion including a first side insertion portion that extends rearward along the perimeter of the front portion and protrudes toward the cover extension portion, and It is formed by opening on the above-mentioned side portion and includes an insertion hole formed on the opposite side of the first side insertion portion, The above cover extension is, A first side coupling hole formed on the outer surface and into which the first side insertion part is inserted, and A linear compressor comprising an insertion projection formed on the outer surface and inserted into the insertion hole.

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