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 valve for discharging refrigerant compressed in a compression space of a cylinder, the discharge valve comprising a valve body that selectively comes into contact with the cylinder, and an insertion protrusion that protrudes from the valve body in the axial direction and is coupled to a valve spring, wherein the insertion protrusion comprises a first portion that protrudes from a central portion of the valve body in the axial direction, and a plurality of second portions that extend from an outer circumferential surface of the first portion in the radial direction, and the plurality of second portions may be spaced apart from one another in the circumferential direction along the outer circumferential surface of the first portion.

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 side via the discharge valve. The discharge valve can be elastically supported by a coil spring in a direction that adheres to the end of the cylinder.

[0006] According to conventional linear compressors, the discharge valve rotated on its own during the opening and closing process, resulting in a problem where the part of the discharge valve in contact with the cylinder was continuously worn out.

[0007] If the amount of wear on the discharge valve increases, the refrigerant discharged from the compression space of the cylinder leaks when the discharge valve is closed, and consequently, there is a problem of reduced refrigeration capacity of the compressor.

[0008] In addition, there is a problem in that a tapping sound is generated when the discharge valve strikes the cylinder during the opening and closing process of the discharge valve, and the generated tapping sound is transmitted to the outside of the compressor through the discharge cover.

[0009] Korean Published Patent Application No. 10-2006-0086686 (August 1, 2006), Title of Invention: Discharge Valve Assembly of a Linear Compressor

[0010] The present invention aims to provide a linear compressor capable of preventing the discharge valve from rotating on its own during the opening and closing process by improving the structure of the discharge valve assembly.

[0011] The present invention aims to provide a linear compressor capable of preventing wear on the part of the discharge valve that contacts the cylinder.

[0012] The present invention aims to provide a linear compressor capable of preventing leakage of refrigerant discharged from the compression space of a cylinder.

[0013] The present invention aims to provide a linear compressor capable of preventing tossing sounds generated at a discharge valve from being transmitted to the outside of the compressor through a discharge cover.

[0014] A linear compressor according to an embodiment of the present invention includes a discharge valve that discharges refrigerant compressed in the compression space of a cylinder.

[0015] The discharge valve may include a valve body that selectively contacts a cylinder and an insertion projection that protrudes axially from the valve body and is coupled to a valve spring.

[0016] The above insertion projection may include a first portion protruding axially from the center of the valve body and a plurality of second portions extending radially from the outer surface of the first portion.

[0017] The plurality of second parts may be spaced apart from each other in a circumferential direction along the outer surface of the first part.

[0018] The above plurality of second parts may be composed of three.

[0019] The three second parts mentioned above can be spaced apart from each other at equal intervals.

[0020] The discharge valve may further include a spring seating portion that protrudes axially from the valve body and on which the valve spring is seated.

[0021] The above spring seating portion may protrude axially from the center of the valve body.

[0022] The above insertion projection may protrude axially from the center of the spring seating portion.

[0023] When the above valve spring is seated on the spring seating portion, the insertion projection can be fitted into the inner side of the valve spring.

[0024] The axial protrusion length of the above-mentioned insertion projection may be formed to be shorter than the axial protrusion length of the above-mentioned spring seating portion.

[0025] The diameter of the above insertion projection may be formed to be smaller than the diameter of the above spring seating portion.

[0026] The above insertion projection can be coupled to penetrate the center of the valve spring.

[0027] Each of the above plurality of second parts may include an outer periphery having a curvature set with respect to the center of the insertion projection.

[0028] When the above insertion projection is coupled to the valve spring, the outer circumference of each of the plurality of second parts can all come into contact with the inner circumference of the center of the valve spring.

[0029] The above valve spring may include a projection coupling portion comprising an insertion hole coupled to the insertion projection.

[0030] The above valve spring may further include a plurality of spring extensions extending in a spiral shape at a plurality of points of the projection coupling portion.

[0031] The above-mentioned projection coupling portion may include a plurality of fitting portions that extend circumferentially with respect to the center of the insertion hole and are coupled with a second portion of the insertion projection.

[0032] The above plurality of fitting parts may be spaced apart from each other in the circumferential direction with respect to the center of the insertion hole.

[0033] The above-mentioned protrusion coupling part may further include a plurality of jaw support parts connecting the plurality of fitting parts to each other.

[0034] The above plurality of jaw support members may each protrude in the direction of the center of the insertion hole.

[0035] The above plurality of fitting parts may be formed convexly outwardly in the radial direction with respect to the center of the insertion hole.

[0036] The above plurality of jaw support portions may be formed concavely inwardly in the radial direction relative to the center of the insertion hole.

[0037] The above valve spring may further include a spring rim portion that connects each end of the plurality of spring extension portions in a circumferential direction.

[0038] The diameter of the valve spring can be defined by the diameter of the spring rim portion.

[0039] According to an embodiment of the present invention, by improving the structure of the discharge valve assembly, it is possible to prevent the discharge valve from rotating on its own during the process of opening and closing the discharge valve.

[0040] According to an embodiment of the present invention, by changing the shape of the discharge valve and the shape of the valve spring, wear on the part of the discharge valve that contacts the cylinder can be prevented. Accordingly, leakage of the refrigerant discharged from the compression space of the cylinder can be prevented.

[0041] According to an embodiment of the present invention, by applying a leaf spring, the transmission of the tapping sound generated at the discharge valve to the outside of the compressor through the discharge cover can be minimized.

[0042] FIG. 1 is a cross-sectional view of a linear compressor according to an embodiment of the present invention.

[0043] Figure 2 is a cross-sectional view taken along 2-2 of Figure 1.

[0044] FIG. 3 is a perspective view of a discharge valve assembly according to an embodiment of the present invention.

[0045] FIGS. 4 and FIGS. 5 are exploded perspective views of a discharge valve assembly according to an embodiment of the present invention.

[0046] FIG. 6 is a cross-sectional view of a discharge valve assembly according to an embodiment of the present invention.

[0047] FIG. 7 is a plan view showing the combination of a discharge valve and a valve spring according to an embodiment of the present invention.

[0048] FIG. 8 is a plan view of a valve spring according to an embodiment of the present invention.

[0049] FIG. 9 is a plan view showing the combination of a discharge valve and a valve spring according to another embodiment of the present invention.

[0050] FIG. 10 is a plan view of a valve spring according to another embodiment of the present invention.

[0051] FIG. 11 is a cross-sectional view showing the configuration of a discharge cover assembly according to an embodiment of the present invention.

[0052] FIG. 12 is a cross-sectional view showing the appearance of a refrigerant flowing through the discharge chamber of a discharge cover assembly according to an embodiment of the present invention.

[0053] FIG. 13 is a graph showing the change in the amount of wear of the discharge valve according to the change in the operating time of the compressor for the control group and the present invention.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] Referring to FIGS. 1 and 2, 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). In a broad sense, the first shell cover (12) and the second shell cover (13) may be understood as components of the shell (11).

[0058] The shell (11) has a roughly cylindrical shape and can be arranged in a horizontally lying position or in an axially lying position. Based on FIG. 1, the shell (11) is extended horizontally and may have a somewhat lower height in the radial direction.

[0059] Since the linear compressor (10) can have a low height, for example, when the linear compressor (10) is installed on the base of the machine room of a refrigerator, there is an advantage that the height of the machine room can be reduced.

[0060] The above linear compressor (10) may include a plurality of pipes that are provided in the shell (11) or shell cover (12, 13) and can suck in, discharge, or inject refrigerant.

[0061] 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).

[0062] 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).

[0063] Support devices (20, 90) that support the main body of the linear compressor (10) may be included on both sides of the shell (11). 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).

[0064] Here, the main body of the compressor refers to a component provided inside the shell (11), and may include, for example, a drive unit that moves 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. And, 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.

[0065] 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).

[0066] The above support device may include a second support device (90) that is coupled to the second shell cover (13) and supports the discharge cover assembly.

[0067] The linear compressor (10) may include a frame (50) provided inside the 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.

[0068] The above linear compressor (10) includes a piston (70) that moves in a reciprocating linear motion inside the cylinder (60). The piston (70) can move in an axial direction.

[0069] The above linear compressor (10) may further include a suction muffler (25) coupled to the piston (70) to reduce noise generated from the refrigerant sucked through the suction pipe (14).

[0070] The refrigerant sucked in through the suction pipe (14) flows 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 a plurality of mufflers combined.

[0071] The above linear compressor (10) may include a motor assembly (41, 43, 45) as a linear motor that provides driving force to the piston (70).

[0072] The motor assembly 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 outer stator (41), and a permanent magnet (45) located in the space between the outer stator (41) and the inner stator (43).

[0073] 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 the frame (50), and the other side can be supported by the stator cover (32).

[0074] The permanent magnet (45) can move in a linear reciprocating motion due to the mutual electromagnetic force between 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.

[0075] The above permanent magnet (45) can be installed in a magnet frame (46). The magnet frame (46) has a roughly cylindrical shape and can be positioned to be inserted into the space between the outer stator (41) and the inner stator (43).

[0076] The magnet frame (46) is coupled to the piston (70), and when the permanent magnet (45) reciprocates, the piston (70) can reciprocate in the axial direction together with the permanent magnet (45).

[0077] The above 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 the 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.

[0078] 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 the supporter (33).

[0079] The rear cover (31) may include a plurality of support legs that are coupled to the rear of the stator cover (32).

[0080] The linear compressor (10) may include an inlet guide (23) coupled to the rear cover (31) to guide 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).

[0081] The above linear compressor (10) may further include a plurality of resonant springs (30) each having an adjusted natural frequency so that the piston (70) can resonate.

[0082] The 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.

[0083] The frame (50) is understood as a configuration for fixing the cylinder (60), and, for example, the cylinder (60) can be pressed into the inside of the frame (50). The frame (50) can be arranged to surround the cylinder (60).

[0084] The above frame (50) has a hollow cylindrical shape and includes a frame body (51) that forms a space into which the cylinder (60) is inserted, and a frame flange (52) that extends radially from the front part of the frame body (51).

[0085] 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 adhesion force may be increased during the press-fitting process between the frame (50) and the cylinder (60).

[0086] The cylinder sealing member (82) has a ring shape and can be installed on the inner surface of the frame (50) on which the flange (62) of the cylinder (60) is seated.

[0087] The above frame (50) may have a bearing channel (58) formed therein that extends axially from the frame flange (52) toward the frame body (51). A refrigerant acting as a gas bearing among the compressed discharge gas may flow through the bearing channel (58).

[0088] The refrigerant acting as the gas bearing is supplied between the cylinder body (61) and the piston (70) of the cylinder (60) to cause the piston (70) to float inside the cylinder (60).

[0089] Defines the direction.

[0090] "Axial direction" can be understood as the direction in which the piston (70) reciprocates, i.e., the up-and-down direction in FIG. 2. Among the "axial directions," 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.

[0091] 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.

[0092] A compression space (P) in which refrigerant is compressed by the piston (70) may be formed inside the cylinder (60). An intake port for introducing 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.

[0093] 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.

[0094] 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).

[0095] The above discharge cover assembly 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).

[0096] For example, the first discharge cover (100) can be press-fitted and fixed to the second discharge cover (200). The cover flange (150) of the first discharge cover (100) can be press-fitted into the inner circumference of the cover flange (250) 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.

[0097] 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 referred to as 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).

[0098] 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).

[0099] If high-temperature heat is excessively transferred to the frame (50), that heat becomes a factor that raises the temperature (suction temperature) of the refrigerant sucked into the compression space (P) of the cylinder (60).

[0100] If the above suction temperature increases, the volume of refrigerant per unit mass, that is, the specific volume of the refrigerant, increases, causing a decrease in volumetric efficiency, 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.

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

[0104] By making the first discharge cover (100) of the above-mentioned first discharge cover (100) of a plastic material, the amount of high-temperature heat within the first discharge cover (100) that is directly transferred to the frame (50) supporting the first discharge cover (100) or transferred to the second discharge cover (200) that is press-fitted to the first discharge cover (100) can be reduced.

[0105] By making the second discharge cover (200) of the above-mentioned second discharge cover (200) of a plastic material, the amount of high-temperature heat within the second discharge cover (200) that is directly transferred to the frame (50) supporting the second discharge cover (200) or transferred to the first discharge cover (100) that is press-fitted to the second discharge cover (200) can be reduced.

[0106] Ultimately, it is possible to prevent excessive transfer of high-temperature heat from the refrigerant present in the discharge chamber within the first and second discharge covers (100, 200) to the frame (50). Accordingly, the suction temperature of the refrigerant can be reduced and the compression efficiency of the compressor can be improved.

[0107] 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).

[0108] To prevent such problems, the discharge cover assembly according to the present embodiment may include a damping member (180) for reducing vibration of the first and second discharge covers (100, 200).

[0109] The damping member (180) is mounted in the recess (140) 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).

[0110] 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. In particular, when the discharge valve (410) is turned on / off, the effect of reducing the magnitude of the valve tapping sound that is frictionally applied to the cylinder (60) can be expected.

[0111] In a structure in which the damping member (180) is mounted on the recess (140) of the first discharge cover (100), the recess (140) and the damping member (180) form a flow path through which refrigerant flows, and the flow path can be understood as defining a pulsation path to reduce pulsation that occurs when high-pressure discharge gas flows.

[0112] The above discharge cover assembly may include a third discharge cover (300) that supports the second discharge cover (200).

[0113] 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).

[0114] The third discharge cover (300) can be supported on the front of the frame (50).

[0115] 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) can come into surface contact with the rear surface of the third discharge cover (300).

[0116] 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).

[0117] The above fastening member can 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).

[0118] 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).

[0119] 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 the fastening member, a failure in connection may occur if the amount of deformation increases due to high heat. Therefore, the third discharge cover (300) may be made of a metal material so that the amount of thermal deformation is not large.

[0120] 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).

[0121] The above linear compressor (10) may include a discharge valve assembly (400).

[0122] The discharge valve assembly (400) may include a discharge valve (410) and a spring assembly (420) that provides elastic force to the discharge valve (410) in a direction that brings it into close contact with the front end of the cylinder (60). The spring assembly (420) may be named a "valve support device" in that it supports the discharge valve (410).

[0123] The above spring assembly (420) may include a valve spring (430) composed of a leaf spring and a spring bracket (450) that surrounds the edge of the valve spring (430) to support the valve spring (430).

[0124] The discharge valve (410) is coupled to the central part of the valve spring (430). When the discharge valve (410) is opened, the refrigerant compressed in the compression space (P) of the cylinder (60) is discharged and flows into the internal space of the first discharge cover (100). At this time, the valve spring (430) can be deformed in a direction that opens the discharge valve (410).

[0125] When the discharge of the refrigerant is completed, the discharge valve (410) can be closed by the restoring force of the valve spring (430).

[0126] The above spring bracket (450) can be seated on the inner surface of the first discharge cover (100).

[0127] 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 surface of the spring bracket (450).

[0128] 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 (420).

[0129] FIG. 3 is a perspective view of a discharge valve assembly according to an embodiment of the present invention, FIG. 4 and FIG. 5 are exploded perspective views of a discharge valve assembly according to an embodiment of the present invention, FIG. 6 is a cross-sectional view of a discharge valve assembly according to an embodiment of the present invention, FIG. 7 is a plan view showing the discharge valve and valve spring combined according to an embodiment of the present invention, and FIG. 8 is a plan view of a valve spring according to an embodiment of the present invention.

[0130] Referring to FIGS. 3 to 8, a discharge valve assembly (400) according to an embodiment of the present invention may include a discharge valve (410) that selectively opens and closes the compression space (P) of the cylinder (60).

[0131] Here, the compression space (P) is understood as a space formed between the suction valve (75) and the discharge valve (410). The suction valve (75) may be formed on one side of the compression space (P), and the discharge valve (410) may be provided on the other side of the compression space (P), that is, on the opposite side of the suction valve (76).

[0132] The discharge valve (410) can be opened when the pressure in the compression space (P) exceeds the discharge pressure, allowing the refrigerant to flow into the discharge chamber of the first discharge cover (100).

[0133] The discharge valve (410) may include a valve body (411) that selectively contacts the cylinder (60). The valve body (411) may, for example, have the shape of a disc. The valve body (411) may include a rear portion (412) that contacts the front end of the cylinder (60).

[0134] The valve body (411) may include an avoidance groove (413) that is recessed forward from the rear portion (412). The avoidance groove (413) is understood as an "interference prevention groove" that prevents at least a portion of the piston (70) from interfering with the discharge valve (410) during the process in which the piston (70) moves forward to compress the refrigerant. Here, at least a portion of the piston (70) may include a fastening member (78) for fastening the suction valve (75) to the piston (70).

[0135] The discharge valve (410) may include a spring seating portion (414) that protrudes axially forward from the valve body (411) and on which the valve spring (430) is seated. The spring seating portion (414) may protrude forward from the center of the valve body (411).

[0136] The discharge valve (410) may include an insertion projection (415) that protrudes forward from the valve body (411) and is coupled to the valve spring (430). The insertion projection (415) may protrude forward from the center of the valve body (411).

[0137] For example, the insertion projection (415) may protrude forward from the center of the spring seating portion (414). When the valve spring (430) is seated on the spring seating portion (414), the insertion projection (415) may be fitted into the inner side of the valve spring (430).

[0138] At this time, the axial protrusion length of the insertion projection (415) may be formed to be shorter than the axial protrusion length of the spring seating portion (414).

[0139] The diameter of the insertion projection (415) may be formed to be smaller than the diameter of the spring seating portion (414).

[0140] The insertion projection (415) may be coupled to penetrate the center of the valve spring (430). The insertion projection (415) may be coupled to a projection coupling part (435) provided on the valve spring (430). The projection coupling part (435) may include an insertion hole (437) into which the insertion projection (415) is inserted.

[0141] The cross-sectional shapes of the insertion projection (415) and the insertion hole (437) have corresponding shapes, for example, they may have a non-circular shape. Accordingly, when the discharge valve (410) performs an opening and closing action while the insertion projection (415) is inserted into the insertion hole (437), the phenomenon of the discharge valve (410) rotating on its own can be prevented.

[0142] Ultimately, the effect is that the discharge valve (410) can be prevented from acting unstably and the wear of the discharge valve (410) caused by the unstably acting can be reduced.

[0143] The insertion projection (415) may include a groove (417). The groove (417) may be configured to be recessed from the front to the rear of the insertion projection (415).

[0144] The above-mentioned groove (417) is understood to realize a weight reduction structure of the discharge valve (410), and the weight reduction structure can reduce the weight of the discharge valve (410) and improve the responsiveness of the discharge valve (410).

[0145] The insertion projection (415) may include a plurality of outer portions (415a) extending in a circumferential direction with a curvature set with respect to the center of the insertion projection (415). The plurality of outer portions (415a) are spaced apart from each other in a circumferential direction and may have an arc shape with respect to the center of the insertion projection (415). For example, the plurality of outer portions (415a) may include three outer portions.

[0146] The insertion projection (415) may include a plurality of projection jaws (416a, 416b, 416c) that connect the plurality of outer portions (415a) to each other. The plurality of projection jaws (416a, 416b, 416c) may be arranged in a circumferential direction with respect to the center of the insertion projection (415).

[0147] The plurality of protrusions (416a, 416b, 416c) may be configured to have a shape or curvature different from that of the plurality of outer periphery portions (415a). For example, the plurality of protrusions (416a, 416b, 416c) may have a shape that is recessed from both ends of the outer periphery portion (415a) in a direction approaching the center of the insertion protrusion (415).

[0148] The above plurality of protruding jaws (416a, 416b, 416c) may include a first protruding jaw (416a), a second protruding jaw (416b), and a third protruding jaw (416c).

[0149] By configuring the outer surface of the insertion projection (415) including the plurality of outer periphery portions (415a) and the plurality of projection jaws (416a, 416b, 416c), the insertion projection (415) may have a non-circular shape.

[0150] In another aspect, the insertion projection (415) may include a first portion protruding axially from the center of the valve body (411) and a plurality of second portions extending radially from the outer surface of the first portion. In this case, the plurality of second portions may be spaced apart from each other in a circumferential direction along the outer surface of the first portion.

[0151] For example, the plurality of second parts may consist of three. The three second parts may be spaced apart from each other at equal intervals.

[0152] Each of the above plurality of second parts may include an outer portion (415a) having a curvature set with respect to the center of the insertion projection (415).

[0153] When the above insertion projection (415) is coupled to the valve spring (430), the outer circumference (415a) of each of the plurality of second parts can all come into contact with the inner circumference of the center of the valve spring (430).

[0154] Due to the configuration of such an insertion projection (415), the insertion projection (415) may have a non-circular shape.

[0155] The valve spring (430) is coupled to the front of the discharge valve (410) to enable elastic movement of the discharge valve (410). The valve spring (430) includes a plate spring and, for example, may have the shape of a roughly disc.

[0156] The valve spring (430) may include a projection coupling portion (435) that forms an insertion hole (437) for coupling with the insertion projection (415) of the discharge valve (410). The projection coupling portion (435) may be formed approximately in the center of the valve spring (430).

[0157] The above-mentioned protrusion coupling portion (435) may include a plurality of fitting portions (435a) that extend in a circumferential direction with respect to the center of the insertion hole (437) corresponding to a plurality of outer portions (415a) of the discharge valve (410). The plurality of fitting portions (435a) are spaced apart from each other in a circumferential direction and may have an arc shape with respect to the center of the insertion hole (437). For example, the plurality of fitting portions (435a) may include three outer portions.

[0158] The above-mentioned projection coupling portion (435) may include a plurality of jaw support portions (436a, 436b, 436c) that connect the plurality of fitting portions (435a) to each other and have shapes corresponding to the plurality of projection jaws (416a, 416b, 416c). The plurality of jaw support portions (436a, 436b, 436c) may be arranged in a circumferential direction with respect to the center of the insertion hole (437).

[0159] The plurality of jaw support portions (436a, 436b, 436c) may be configured to have a different shape or curvature from the plurality of fitting portions (435a). For example, the plurality of jaw support portions (436a, 436b, 436c) may have a shape that protrudes from both ends of the fitting portion (435a) in a direction approaching the center of the insertion hole (435).

[0160] The above plurality of jaw support members (436a, 436b, 436c) may include a first jaw support member (436a), a second jaw support member (436b), and a third jaw support member (436c).

[0161] The plurality of fitting portions (435a) may be formed convexly outwardly in the radial direction with respect to the center of the insertion hole (437), and the plurality of jaw support portions (436a, 436b, 436c) may be formed concavely inwardly in the radial direction with respect to the center of the insertion hole (437).

[0162] By configuring the inner surface of the projection coupling part (435) including the plurality of fitting parts (435a) and the plurality of jaw support parts (436a, 436b, 436c), the projection coupling part (435) may have a non-circular shape.

[0163] The valve spring (430) may include a plurality of spring extensions (438a, 438b, 438c) that extend in a swirl or spiral shape at a plurality of points of the projection coupling portion (435).

[0164] The plurality of spring extension parts (438a, 438b, 438c) may include a first spring extension part (438a) extending from a first point of the projection coupling part (435). The first point may be a point connecting the first fitting part and the first jaw support part (436a) among the plurality of fitting parts (435a).

[0165] The plurality of spring extension parts (438a, 438b, 438c) may include a second spring extension part (438b) extending from a second point of the projection coupling part (435). The second point may be a point connecting the second fitting part and the second jaw support part (436b) among the plurality of fitting parts (435a).

[0166] The plurality of spring extension parts (438a, 438b, 438c) may include a third spring extension part (438c) extending from a third point of the projection coupling part (435). The third point may be a point connecting the third fitting part and the third jaw support part (436c) among the plurality of fitting parts (435a).

[0167] The plurality of spring extension parts (438a, 438b, 438c) can be extended from the projection coupling part (435) in the direction of the outer circumference of the valve spring (430).

[0168] A space (439) may be formed between the plurality of spring extension parts (438a, 438b, 438c). The refrigerant discharged from the discharge valve (410) through the space (439) may flow to the discharge outlet of the first discharge cover (100).

[0169] The above valve spring (430) may include a spring rim portion (440) connecting the plurality of spring extension portions (438a, 438b, 438c).

[0170] The valve spring (430) can connect each end of the plurality of spring extensions (438a, 438b, 438c) in a circumferential direction. The spring rim (440) can be formed on the outermost edge of the valve spring (430). The diameter (D1) of the valve spring (430) can be defined by the diameter of the spring rim (440).

[0171] The spring rim portion (440) may be formed to surround and connect each end of the plurality of spring extension portions (438a, 438b, 438c). For example, the spring rim portion (440) may be formed in a ring shape. The center of the spring rim portion (440) may coincide with the center of the projection coupling portion (435).

[0172] The above spring rim portion (440) can be coupled to the spring bracket (450). For example, at least a portion of the spring rim portion (440) can be coupled or seated on the inner surface of the spring bracket (450).

[0173] The above-mentioned protrusion coupling part (435), the plurality of spring extension parts (438a, 438b, 438c), and the spring rim part (440) may have the same thickness. That is, the front and rear ends of the above-mentioned protrusion coupling part (435), the plurality of spring extension parts (438a, 438b, 438c), and the spring rim part (440) may be located on the same plane.

[0174] The spring bracket (450) can be injection molded onto the valve spring (430). That is, the spring bracket (450) can be injection molded onto the valve spring (430) in one step without the need to provide multiple parts to support the valve spring (430), thereby reducing material costs and simplifying the assembly process of the spring assembly (420).

[0175] The spring bracket (450) may be made of a deformable material so as to be in close contact with the first discharge cover (100), the cylinder (60), and the sealing bracket (85) during the installation process of the spring assembly (420).

[0176] The spring bracket (450) is press-fitted and fixed to the first discharge cover (100), the cylinder (60), and the sealing bracket (85) to reduce vibration and noise generated from the discharge valve (410).

[0177] The spring bracket (450) may be made of a rubber material. For example, the spring bracket (450) may be made of a fluororubber (FKM) material.

[0178] The spring bracket (450) may be configured to support the rim portion of the valve spring (430). The spring bracket (450) may include a first wall (460) that forms the outer surface of the spring bracket (450) and is pressed into the first discharge cover (100).

[0179] The spring bracket (450) may include a second wall (470) that forms the inner surface of the spring bracket (450) and is pressed into the cylinder (60). The plurality of spring extensions (438a, 438b, 438c) may be inserted and fixed into the second wall (470).

[0180] The first wall (460) may be configured to surround the second wall (470) at the front portion of the second wall (470). Accordingly, the outer diameter (D2) of the first wall (460) may be formed larger than the outer diameter (D3) of the second wall (470). The spring bracket (450) may include a stepped portion equal to the difference between the outer diameter (D2) of the first wall (460) and the outer diameter (D3) of the second wall (470).

[0181] At this time, the outer diameter (D1) of the valve spring (430) may be formed smaller than the outer diameter (D2) of the first wall (460) and larger than the outer diameter (D3) of the second wall (470).

[0182] The first wall (460) may include an outer surface portion (461) that forms a part of the outer surface of the spring bracket (450). The outer surface portion (461) includes a surface that extends in the circumferential direction of the spring bracket (450) and may form the largest outer diameter of the spring bracket (450).

[0183] The first wall (460) may include a stepped portion (462) forming the rear end of the first wall (460). The stepped portion (462) may form a step corresponding to the difference between the outer diameter (D2) of the first wall (460) and the outer diameter (D3) of the second wall (470).

[0184] A projection (480) may be provided on the stepped portion of the spring bracket (450). That is, the projection (480) may be provided on the outer surface of the second wall (470) and may be connected to the stepped portion (462) of the first wall (460). For example, the projection (480) may extend rearward from the stepped portion (462) and be connected to the outer surface of the second wall (470).

[0185] The above protrusions (480) are provided in multiple numbers, and the multiple protrusions (480) may be spaced apart in the circumferential direction with respect to the center of the valve spring (430).

[0186] The above-mentioned protrusion (480) may include a surface that is pressed into the sealing bracket (85). The surface that is pressed into the above-mentioned protrusion (480) constitutes a supporting surface (481) of the above-mentioned protrusion (480), and the supporting surface (481) may form the rear surface of the above-mentioned protrusion (480).

[0187] The second wall (470) may include a first inner surface portion (471) to which the valve spring (430) is coupled. The first inner surface portion (471) extends in the circumferential direction of the spring bracket (450) and may include a plurality of spring coupling portions to which the plurality of spring extension portions (438a, 438b, 438c) are coupled.

[0188] For example, the first inner surface portion (471) may include a first coupling portion to which the first spring extension portion (438a) is coupled, a second coupling portion to which the second spring extension portion (438b) is coupled, and a third coupling portion to which the third spring extension portion (438c) is coupled.

[0189] The first coupling part, the second coupling part, and the third coupling part may be spaced apart from each other in the circumferential direction of the first inner surface part (471).

[0190] The second wall (470) may include a second inner surface portion (472) that forms an internal space in which at least a portion of the discharge valve (410) is located. The second inner surface portion (472) may extend in the circumferential direction of the spring bracket (450).

[0191] The axial length (front-back direction) of the second inner surface portion (472) may be greater than the axial length (front-back direction) of the first inner surface portion (471).

[0192] The inner diameter of the second inner surface portion (472) may be larger than the inner diameter of the first inner surface portion (471). The second wall (470) may include a stepped portion equal to the difference between the inner diameter of the second inner surface portion (472) and the outer diameter of the first inner surface portion (471).

[0193] The second wall (470) may be supported by the cylinder (60). Specifically, the second wall (470) may include a cylinder support portion (475) that contacts the cylinder (60). For example, the cylinder support portion (475) may be pressed into the first jaw (63) of the cylinder (60).

[0194] The above cylinder support (475) is formed at the rear end of the second wall (470) and can have a ring shape by extending in the circumferential direction.

[0195] The cylinder support member (475) may include a press-fit surface that contacts the first flange (63). As the cylinder support member (475) presses into the first flange (63), the refrigerant flowing through the internal space of the spring bracket (450) may be prevented from leaking to the outside of the cylinder (60).

[0196] The valve spring (430) can be inserted into the spring bracket (450). For example, at least a portion of the valve spring (430) can be inserted into the second wall (470).

[0197] In order for the spring bracket (450) to perform damping against vibration in response to the opening and closing action of the discharge valve (410) and the deformation of the valve spring (430), the spring bracket (450) may have a thickness set in the axial direction of the valve spring (430).

[0198] FIG. 9 is a plan view showing a discharge valve and a valve spring combined according to another embodiment of the present invention, and FIG. 10 is a plan view of a valve spring according to another embodiment of the present invention.

[0199] This embodiment is identical to the previously described embodiment in other respects, except for a difference in the structure of the valve spring. Therefore, below, only the characteristic parts of this embodiment will be described, and parts identical to the previously described embodiment will be referred to by reference.

[0200] Referring to FIGS. 9 and 10, a discharge valve assembly (400) according to another embodiment of the present invention may include a discharge valve (410) and a spring assembly (420) that provides elastic force in a direction in which the discharge valve (410) is pressed against the front end of the cylinder (60).

[0201] The above spring assembly (420) may include a valve spring (430) composed of a leaf spring and a spring bracket (450) that surrounds the edge of the valve spring (430) to support the valve spring (430).

[0202] The discharge valve (410) and the spring bracket (450) are identical to those described in the previous embodiment, so a detailed description thereof is omitted.

[0203] The valve spring (430) is coupled to the front of the discharge valve (410) to enable elastic movement of the discharge valve (410). The valve spring (430) includes a plate spring and, for example, may have the shape of a roughly disc.

[0204] The valve spring (430) may include a projection coupling portion (435) that forms an insertion hole (437) for coupling with the insertion projection (415) of the discharge valve (410). The projection coupling portion (435) may be formed approximately in the center of the valve spring (430).

[0205] The above-mentioned protrusion coupling portion (435) may include a plurality of fitting portions (435a) that extend in a circumferential direction with respect to the center of the insertion hole (437) corresponding to a plurality of outer portions (415a) of the discharge valve (410). The plurality of fitting portions (435a) are spaced apart from each other in a circumferential direction and may have an arc shape with respect to the center of the insertion hole (437). For example, the plurality of fitting portions (435a) may include three outer portions.

[0206] The above-mentioned projection coupling portion (435) may include a plurality of jaw support portions (436a, 436b, 436c) that connect the plurality of fitting portions (435a) to each other and have shapes corresponding to the plurality of projection jaws (416a, 416b, 416c). The plurality of jaw support portions (436a, 436b, 436c) may be arranged in a circumferential direction with respect to the center of the insertion hole (437).

[0207] The plurality of jaw support portions (436a, 436b, 436c) may be configured to have a different shape or curvature from the plurality of fitting portions (435a). For example, the plurality of jaw support portions (436a, 436b, 436c) may have a shape that protrudes from both ends of the fitting portion (435a) in a direction approaching the center of the insertion hole (435).

[0208] The above plurality of jaw support members (436a, 436b, 436c) may include a first jaw support member (436a), a second jaw support member (436b), and a third jaw support member (436c).

[0209] By configuring the inner surface of the projection coupling part (435) including the plurality of fitting parts (435a) and the plurality of jaw support parts (436a, 436b, 436c), the projection coupling part (435) may have a non-circular shape.

[0210] The valve spring (430) may include a plurality of spring extensions (438a, 438b, 438c) that extend in a swirl or spiral shape at a plurality of points of the projection coupling portion (435).

[0211] The plurality of spring extension parts (438a, 438b, 438c) may include a first spring extension part (438a) extending from a first point of the projection coupling part (435). The first point may be a point connecting the first fitting part and the first jaw support part (436a) among the plurality of fitting parts (435a).

[0212] The plurality of spring extension parts (438a, 438b, 438c) may include a second spring extension part (438b) extending from a second point of the projection coupling part (435). The second point may be a point connecting the second fitting part and the second jaw support part (436b) among the plurality of fitting parts (435a).

[0213] The plurality of spring extension parts (438a, 438b, 438c) may include a third spring extension part (438c) extending from a third point of the projection coupling part (435). The third point may be a point connecting the third fitting part and the third jaw support part (436c) among the plurality of fitting parts (435a).

[0214] The plurality of spring extension parts (438a, 438b, 438c) can be extended from the projection coupling part (435) in the direction of the outer circumference of the valve spring (430).

[0215] A space (439) may be formed between the plurality of spring extension parts (438a, 438b, 438c). The refrigerant discharged from the discharge valve (410) through the space (439) may flow to the discharge outlet of the first discharge cover (100).

[0216] According to one embodiment, the space portion (439) may include a first space portion (439a) formed between one spring extension portion (438b) and a projection coupling portion (435) facing one spring extension portion (438b), and a second space portion (439b) formed between one spring extension portion (438b) and another spring extension portion (438a) facing one spring extension portion (438b).

[0217] The first space part (439a) and the second space part (439b) may be connected. The space part (439) may be extended in a vortex or spiral shape.

[0218] At this time, the cross-sectional area or radial width of the first space (439a) may be formed to be larger than the cross-sectional area or radial width of the second space (439b).

[0219] And the cross-sectional area or radial width of the first space (439a) may be formed to be larger than the cross-sectional area or radial width of the insertion hole (437). For example, the maximum radial distance or maximum width of the first space (439a) may be formed to be larger than the maximum radial distance or maximum width of the insertion hole (437).

[0220] That is, since the cross-sectional area or width of the space portion (439) is formed to be relatively large, the amount of refrigerant discharged from the discharge valve (410) through the space portion (439) can be increased. Since the amount of refrigerant discharged from the discharge valve (410) can be increased, the discharge performance of the discharge valve (410) can be improved.

[0221] FIG. 11 is a cross-sectional view showing the configuration of a discharge cover assembly according to an embodiment of the present invention, and FIG. 12 is a cross-sectional view showing the appearance of a refrigerant flowing through the discharge chamber of a discharge cover assembly according to an embodiment of the present invention.

[0222] Referring to FIGS. 11 and 12, a discharge cover assembly according to an embodiment of the present invention may be supported on the frame (50). The discharge cover assembly may include a first discharge cover (100) and a second discharge cover (200) that are stacked in the axial direction.

[0223] The first and second discharge covers (100, 200) are installed to contact the frame (50), and in order to reduce the amount of heat transfer from the first and second discharge covers (100, 200) to the frame (50), the first and second discharge covers (100, 200) may be made of a non-metallic material, for example, a plastic material.

[0224] The discharge cover assembly may include a third discharge cover (300) that is fastened to the frame (50). The third discharge cover (300) may be configured to surround at least a portion of the second discharge cover (200) so as to press the second discharge cover (200) toward the frame (50).

[0225] The third discharge cover (300) can be connected to the frame (50). To prevent failure in connection between the third discharge cover (300) and the frame (50), the third discharge cover (300) may be made of a metal material with low thermal deformation, for example, aluminum.

[0226] The above discharge cover assembly may include a discharge chamber through which high-pressure discharge gas discharged from the discharge valve (410) flows.

[0227] The above discharge chamber 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 (410) as an internal space defined by the inner wall (130) of the first discharge cover (100).

[0228] When the discharge valve (410) 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).

[0229] 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).

[0230] The first discharge chamber (A2) above can be understood as one area of ​​the discharge chambers 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).

[0231] 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).

[0232] The inner wall (238) can be understood as a partition wall that divides the discharge chamber of the second discharge cover (200) into a first discharge chamber (A2) and a second discharge chamber (A3). The second discharge chamber (A3) can be understood as an outer space of the inner wall (238).

[0233] 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 named, in order, the first discharge chamber (A1), the second discharge chamber (A2), and the third discharge chamber (A3).

[0234] 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. 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).

[0235] 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 a second recess formed on the opposite side of the first recess. The second recess can function as an outlet for the pulsating flow path.

[0236] 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).

[0237] The second recess can be connected to the outer space of the inner wall (238), that is, the third discharge chamber (A3). Accordingly, the refrigerant discharged from the second recess can flow into the third discharge chamber (A3).

[0238] The third discharge chamber (A3) can be connected to the discharge hole (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 hole (280) and discharged to the discharge pipe of the shell (11) through the loop pipe (290).

[0239] FIG. 13 is a graph showing the change in the amount of wear of the discharge valve according to the change in the operating time of the compressor for the control group and the present invention.

[0240] Referring to FIG. 13, “the present invention” relates to a linear compressor having a structure as described in FIG. 1 to FIG. 12, and “control group” relates to a linear compressor having a valve spring composed of a coil spring, rather than a valve spring composed of a plate spring as in the present invention.

[0241] The horizontal axis of FIG. 13 represents the starting time of the compressor, and the vertical axis represents the amount of wear on the discharge valve according to the starting time of the compressor. It can be seen that as the starting time of the compressor elapses, the amount of wear on the discharge valve of the present invention is less than the amount of wear on the discharge valve of the control group.

[0242] In particular, it can be seen that the slope of the trend line (L2) for the amount of wear of the discharge valve of the control group is about 3.5 times greater than the slope of the trend line (L1) for the amount of wear of the discharge valve of the present invention.

[0243] Therefore, compared to a discharge valve with a coil spring in a conventional linear compressor, the amount of wear on a discharge valve with a leaf spring in the linear compressor of the present invention is about 3.5 times less.

Claims

1. A cylinder having a piston inserted therein that reciprocates axially and forms a compression space; A discharge valve for discharging the refrigerant compressed in the above compression space; A discharge cover forming a discharge chamber for the refrigerant discharged through the above discharge valve; A valve spring coupled to the discharge valve and elastically supporting the discharge valve; and It includes a spring bracket that surrounds the edge of the valve spring and supports the valve spring, and The above discharge valve is, A valve body that selectively contacts the above cylinder; and It includes an insertion projection that protrudes axially from the valve body and is coupled to the valve spring, and The above insertion projection is, A first portion protruding axially from the center of the valve body; and It includes a plurality of second parts extending radially from the outer surface of the first part, and The plurality of second parts are linear compressors spaced apart from each other in the circumferential direction along the outer surface of the first part.

2. In Paragraph 1, The above plurality of second parts are composed of three, and The above three second parts are linear compressors spaced apart from each other at equal intervals.

3. In Paragraph 1, A linear compressor wherein the discharge valve protrudes axially from the valve body and further includes a spring seating portion on which the valve spring is seated.

4. In Paragraph 3, The above spring seating portion protrudes axially from the center of the valve body, and The above insertion projection is a linear compressor that protrudes axially from the center of the spring seating portion.

5. In Paragraph 4, A linear compressor in which, when the above valve spring is seated on the above spring seating portion, the above insertion projection is fitted into the inner side of the above valve spring.

6. In Paragraph 4, A linear compressor in which the axial protrusion length of the insertion projection is formed to be shorter than the axial protrusion length of the spring seating portion.

7. In Paragraph 4, A linear compressor in which the diameter of the insertion projection is formed to be smaller than the diameter of the spring seating portion.

8. In Paragraph 1, The above insertion projection is coupled to penetrate the center of the valve spring. A linear compressor.

9. In Paragraph 8, Each of the above plurality of second parts is a linear compressor having an outer periphery having a curvature set with respect to the center of the insertion projection.

10. In Paragraph 9, A linear compressor in which, when the insertion projection is coupled to the valve spring, the outer circumference of each of the plurality of second parts all come into contact with the inner circumference of the center of the valve spring.

11. In Paragraph 1, The above valve spring is, A projection coupling part including an insertion hole coupled to the above-mentioned insertion projection; and A linear compressor comprising a plurality of spring extensions extending in a spiral shape from a plurality of points of the above-mentioned projection coupling portion.

12. In Paragraph 11, The above-mentioned projection coupling portion includes a plurality of fitting portions that extend circumferentially with respect to the center of the insertion hole and are coupled with a second portion of the insertion projection. A linear compressor in which the plurality of fittings are spaced apart from each other in the circumferential direction with respect to the center of the insertion hole.

13. In Paragraph 12, The above-mentioned projection coupling part further includes a plurality of jaw support parts connecting the plurality of fitting parts to each other, and The above plurality of jaw support members are linear compressors that each protrude in the direction of the center of the insertion hole.

14. In Paragraph 13, The above plurality of fitting parts are formed convexly outwardly in the radial direction with respect to the center of the insertion hole, and A linear compressor in which the plurality of jaw support members are formed concavely inwardly in the radial direction with respect to the center of the insertion hole.

15. In Paragraph 1, The above valve spring is a linear compressor further comprising a spring rim portion that connects each end of the plurality of spring extension portions in a circumferential direction.

16. In Paragraph 15, A linear compressor in which the diameter of the valve spring is defined by the diameter of the spring rim portion.

17. A cylinder having a piston inserted therein that reciprocates axially and forms a compression space; A discharge valve installed in the above cylinder and discharging the refrigerant compressed in the above compression space; A discharge cover forming a discharge chamber for the refrigerant discharged through the above discharge valve; A valve spring coupled to the discharge valve and elastically supporting the discharge valve; and It includes a spring bracket that surrounds the edge of the valve spring and supports the valve spring, and The above discharge valve is, A valve body that selectively contacts the above cylinder; and It includes an insertion projection that protrudes axially from the valve body and is coupled to the valve spring, and The above valve spring is, A projection coupling part including an insertion hole coupled to the above-mentioned insertion projection; and It includes a plurality of spring extensions extending in a spiral shape from a plurality of points of the above-mentioned projection coupling part, and The above-mentioned projection coupling part is, A plurality of fitting parts each formed convexly outwardly in the radial direction relative to the center of the insertion hole; and A linear compressor comprising a plurality of jaw support members, each formed concavely inwardly in the radial direction relative to the center of the insertion hole.

18. In Paragraph 17, The plurality of fitting parts are spaced apart from each other in the circumferential direction with respect to the center of the insertion hole, and The above plurality of jaw support members are linear compressors that connect the above plurality of fitting members to each other.

19. In Paragraph 17, The above valve spring is a linear compressor further comprising a spring rim portion that connects each end of the plurality of spring extension portions in a circumferential direction.

20. In Paragraph 19, A linear compressor in which the diameter of the valve spring is defined by the diameter of the spring rim portion.

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