Linear compressor

Abstract

The linear compressor of the present application can include a frame, a cylinder disposed within the frame, a piston disposed within the cylinder to reciprocate in an axial direction, a discharge valve disposed in front of the piston, and a discharge cover assembly coupled with the frame and disposed in front of the piston, the discharge cover assembly can include a discharge cover having an internal space, a first discharge chamber disposed in the internal space of the discharge cover to form a first discharge space inside the first discharge chamber, and a second discharge chamber to form a second discharge space communicating with the first discharge space and a third discharge space communicating with the second discharge space between the second discharge chamber and the first discharge chamber. According to such a configuration, since the first discharge chamber and the second discharge chamber are disposed in the internal space of the discharge cover, heat transfer of the discharged refrigerant to the discharge cover and the frame coupled therewith can be effectively suppressed.

Description

Technical Field

[0001] This invention relates to linear compressors. More specifically, it relates to a linear compressor that compresses a refrigerant by means of the linear reciprocating motion of a piston. Background Technology

[0002] Generally, a compressor is a device that receives power from a power-generating device such as a motor or turbine and compresses working fluids such as air or refrigerant.

[0003] Such compressors can be classified according to the way they compress refrigerant: reciprocating compressors, rotary compressors, and scroll compressors.

[0004] Reciprocating compressors compress fluids by creating a compression space between the piston and cylinder and by having the piston reciprocate linearly. Rotary compressors compress fluids by using eccentrically rotating rollers inside the cylinder. Scroll compressors compress fluids by having a pair of spiral-shaped scrolls mesh and rotate.

[0005] In recent years, the use of linear compressors, which utilize linear reciprocating motion without a crankshaft, has been gradually increasing among reciprocating compressors.

[0006] Linear compressors have the advantages of improved efficiency and simpler structure because they generate less mechanical loss when converting rotary motion into linear reciprocating motion.

[0007] A linear compression mechanism is formed by setting a cylinder inside a housing that forms a sealed space to create a compression chamber, and a piston reciprocating inside the cylinder.

[0008] Therefore, the following process is repeated: as the piston moves to the bottom dead center (BDC), the fluid in the sealed space is drawn into the compression chamber; as the piston moves to the top dead center (TDC), the fluid in the compression chamber is compressed and discharged through the discharge space.

[0009] On the other hand, linear compressors can be classified into oil-lubricated linear compressors and gas-lubricated linear compressors according to their lubrication method.

[0010] Oil-lubricated linear compression mechanisms utilize oil stored inside the housing to lubricate the space between the cylinder and the piston.

[0011] On the other hand, a gas-lubricated linear compression mechanism guides a portion of the discharged refrigerant between the cylinder and the piston, using the gas force of the refrigerant to lubricate the space between the cylinder and the piston.

[0012] In oil-lubricated linear compressors, the relatively low-temperature oil supplied between the cylinder and piston can prevent the cylinder and piston from overheating due to motor heat or compression heat.

[0013] Therefore, oil-lubricated linear compressors can prevent suction losses in advance by suppressing the increase in specific volume caused by the refrigerant being heated when it is drawn into the compression chamber of the cylinder through the piston suction flow path.

[0014] However, in oil-lubricated linear compressors, if the oil discharged into the refrigeration cycle along with the refrigerant is not smoothly recovered into the compressor, an oil shortage may occur inside the compressor housing. Such an oil shortage inside the housing may become a cause of decreased compressor reliability.

[0015] On the other hand, compared with oil-lubricated linear compressors, gas-lubricated linear compressors can be miniaturized, and because they use refrigerant to lubricate the cylinder and piston, they are advantageous in that the reliability of the compressor will not decrease due to lack of oil.

[0016] An example of a linear compressor is disclosed in Korean Patent No. 10-2430410 (hereinafter, Patent Document 1).

[0017] Patent document 1 discloses a linear compressor configured such that a discharge cover assembly forming a refrigerant discharge space includes a discharge cover and two discharge chambers (plenum) disposed inside the discharge cover.

[0018] In this type of linear compressor, the discharge chamber prevents the high-temperature discharged refrigerant from directly contacting the discharge cover, thus slightly suppressing the heat transfer of the discharged refrigerant to the discharge cover and the frame attached to it.

[0019] However, the linear compressor in Patent Document 1 suffers from weak rigidity due to the simple structure of its discharge chamber.

[0020] In addition, since the discharge chamber does not have a structure to reduce the pulsating noise of the discharged refrigerant, there is a problem of relatively large noise generated by the discharge pulsation.

[0021] In addition, there is a problem that the knocking sound of the discharge valve, which is the main noise source of the linear compressor, cannot be reduced.

[0022] In addition, there are difficulties in processing and manufacturing the discharge cap because a refrigerant flow path needs to be formed in order to use a portion of the discharged refrigerant to lubricate the cylinder and piston.

[0023] [Existing Patent Literature]

[0024] Patent Document 1: Korean Patent Publication No. 10-2430410 (granted on August 3, 2022). Summary of the Invention

[0025] The technical problem to be solved by the present invention is to provide a linear compressor that can solve the above-mentioned problems.

[0026] Another technical problem to be solved by the present invention is to provide a linear compressor that can effectively suppress the heat transfer of the discharged refrigerant to the discharge cover and the frame therewith.

[0027] Another technical problem to be solved by the present invention is to provide a linear compressor that increases the rigidity of the discharge chamber, which is disposed on the inside of the discharge cover and forms a plurality of discharge spaces.

[0028] Another technical problem to be solved by the present invention is to provide a linear compressor that effectively reduces noise generated by discharge pulsation.

[0029] Another technical problem to be solved by the present invention is to provide a linear compressor that effectively reduces the knocking noise of the discharge valve, which is the main noise source of the linear compressor.

[0030] Another technical problem to be solved by the present invention is to provide a linear compressor that shortens the travel path of the refrigerant supplied to the gas bearing.

[0031] Another technical problem to be solved by the present invention is to provide a linear compressor with an easy-to-process and manufacture dispensing cap.

[0032] According to one aspect of the invention, a linear compressor may include: a frame; a cylinder disposed within the frame; a piston disposed within the cylinder and reciprocating axially; a discharge valve disposed in front of the piston; and a discharge cover assembly coupled to the frame and disposed in front of the piston, the discharge cover assembly comprising: a discharge cover having an internal space; a first discharge chamber disposed within the internal space of the discharge cover, forming a first discharge space within the first discharge chamber; and a second discharge chamber disposed between the first discharge chamber and the discharge cover, forming a second discharge space communicating with the first discharge space and a third discharge space communicating with the second discharge space between the second discharge chamber and the first discharge chamber.

[0033] With this configuration, since a first discharge chamber and a second discharge chamber are arranged inside the discharge cover, the heat transfer of the discharged refrigerant to the discharge cover and the frame attached thereto can be effectively suppressed.

[0034] The first discharge chamber may be formed of a material having a different thermal conductivity than the material forming the discharge cover.

[0035] As an example, the first discharge chamber may be formed of polyamide 66 (PA66) in a polyamide resin.

[0036] The second discharge chamber may be formed of a material having a different thermal conductivity than the material forming the discharge cover and / or the material forming the first discharge chamber.

[0037] As an example, the second discharge chamber may be formed of polyamide 66 (PA66) in a polyamide resin.

[0038] This configuration allows for a more effective reduction in the heat transferred to the refrigerant being discharged through the discharge cap.

[0039] The first discharge chamber may include: a first cylindrical member forming a first discharge space for refrigerant to flow into through the discharge valve; a first bottom member supporting the first cylindrical member; a first column member protruding rearward from the center of the first cylindrical member toward the discharge valve and having a predetermined depth; and a first wall member in an annular shape protruding from the first bottom member and surrounding the first cylindrical member.

[0040] Furthermore, a plurality of first discharge holes may be formed on the bottom surface of the first column member for discharging the refrigerant flowing in through the discharge valve into the second discharge space of the second discharge chamber, the plurality of first discharge holes being formed through the bottom surface of the first column member.

[0041] A portion of the first bottom component has a second bearing communication hole that communicates with a first bearing communication hole formed in the frame and the third discharge space, respectively. A portion of the refrigerant in the third discharge space can flow through the second bearing communication hole to the first bearing communication hole and lubricate the cylinder and the piston.

[0042] With this configuration, the processing and manufacturing of the ejector cap becomes easier compared to the case where the ejector cap has a second bearing connection hole that communicates with the first bearing connection hole.

[0043] The first wall member can be formed at a predetermined interval from the first cylindrical member, and a pulsation reduction space for reducing refrigerant discharge pulsation can be formed between the inner wall surface of the first wall member and the outer wall surface of the first cylindrical member.

[0044] This configuration reduces the noise generated by the refrigerant discharge pulsation.

[0045] A first inflow hole may be formed in a portion of the outer wall surface of the first cylindrical member. The first inflow hole is used to allow the refrigerant in the second discharge space to flow into the pulsation reduction space. A second discharge hole may be formed in a portion of the first wall member to allow the refrigerant in the pulsation reduction space to flow into the third discharge space.

[0046] This configuration allows for the smooth flow of refrigerant into and out of the pulsation-reducing space.

[0047] The second ejection chamber may further include a second wall member inserted into the pulsation reduction space of the first ejection chamber.

[0048] This configuration allows for further improvement in reducing pulsation.

[0049] The thickness of the second wall member can be formed to be the same as the width of the pulsation reduction space, and the depth to which the second wall member is inserted into the pulsation reduction space can be formed to be less than the depth of the pulsation reduction space.

[0050] This configuration allows for the effective creation of a space that reduces pulsation.

[0051] The first discharge chamber may include at least two types of reinforcing ribs selected from a plurality of first reinforcing ribs, second reinforcing ribs, a plurality of third reinforcing ribs, fourth reinforcing ribs, a plurality of fifth reinforcing ribs, and a plurality of sixth reinforcing ribs. The plurality of first reinforcing ribs protrude from the inner sidewall of the first cylindrical member toward the first discharge space and extend axially. The second reinforcing ribs protrude from the inner side of the upper surface of the first cylindrical member toward the first discharge space and are in a ring shape. The plurality of third reinforcing ribs protrude from the inner sidewall of the first column member toward the first discharge space and extend axially. The fourth reinforcing rib is located on the outer sidewall of the first column member and spatially divides the space into a plurality of first discharge holes. The plurality of fifth reinforcing ribs protrude from the inner sidewall of the first bottom member toward the first discharge space. The plurality of sixth reinforcing ribs protrude from the outer sidewall of the first wall member toward the second discharge chamber and extend axially.

[0052] This configuration increases the rigidity of the first discharge chamber.

[0053] The first ejection chamber may include the first reinforcing rib, the second reinforcing rib, and the third reinforcing rib.

[0054] In this case, the first reinforcing rib and the third reinforcing rib can be formed in the same number and can be formed in opposite positions to each other. The second reinforcing rib can include a bridging portion connected to the first reinforcing rib and the third reinforcing rib. The first reinforcing rib, the second reinforcing rib and the third reinforcing rib can be formed as one piece.

[0055] This configuration allows for a more effective increase in the rigidity of the first discharge chamber.

[0056] The second discharge chamber may include a second cylindrical member and a second bottom member supporting the second cylindrical member. The first discharge chamber may include a plurality of the sixth reinforcing ribs. The second discharge chamber may also include a plurality of seventh reinforcing ribs that protrude from the inner wall of the second cylindrical member toward the third discharge space and extend axially. The plurality of sixth reinforcing ribs and the plurality of seventh reinforcing ribs may be located in the third discharge space formed between the outer surface of the first wall member and the inner surface of the second cylindrical member to reduce refrigerant discharge pulsation.

[0057] This configuration increases the rigidity of the second discharge chamber and further reduces the pulsation of the discharged refrigerant.

[0058] With the first ejection chamber and the second ejection chamber combined, the plurality of the sixth reinforcing ribs can be staggered with the plurality of the seventh reinforcing ribs.

[0059] In this case, multiple seventh stiffeners can be located at the midpoint between adjacent sixth stiffeners.

[0060] This configuration allows for further improvement in reducing pulsation.

[0061] On the inner surface of the second cylindrical member, a plurality of eighth reinforcing ribs protruding toward the discharge valve and extending in a radial direction and at least one ninth reinforcing rib protruding toward the discharge valve and extending in a circumferential direction may be formed, wherein the eighth reinforcing ribs and the ninth reinforcing ribs may be connected to each other to form a single unit.

[0062] This configuration increases the rigidity of the second discharge chamber.

[0063] The second cylindrical component may further include a third discharge port for discharging refrigerant flowing in the internal space of the discharge cap assembly to the outside, wherein a loop pipe may be connected to the third discharge port.

[0064] An O-ring insertion groove for inserting an O-ring can be formed on the outer surface of the second bottom member. The O-ring inserted into the O-ring insertion groove can be located between the second bottom member and the dispensing cap.

[0065] With this configuration, the knocking noise of the discharge valve, which is the main noise source of the linear compressor, can be effectively reduced.

[0066] The ejector cap may include a third cylindrical component and a third bottom component supporting the third cylindrical component. The third bottom component may be mechanically coupled to the flange of the frame.

[0067] With this configuration, the ejector cap assembly can be easily mounted on the frame.

[0068] The inner wall of the third cylindrical member and the outer wall of the second cylindrical member can be separated from each other to form a heat-insulating space between them.

[0069] This configuration allows for more effective suppression of heat transfer from the discharged refrigerant to the discharge cap and the frame attached thereto.

[0070] According to embodiments of the present invention, a linear compressor can be provided that can effectively suppress the heat transfer of the discharged refrigerant to the discharge cover and the frame thereto.

[0071] In addition, a linear compressor with increased rigidity of the discharge chamber can be provided.

[0072] In addition, a linear compressor that effectively reduces noise generated by the discharge pulsation can be provided.

[0073] In addition, a linear compressor that effectively reduces the knocking noise of the discharge valve, which is the main noise source of the linear compressor, can be provided.

[0074] In addition, a linear compressor can be provided that effectively shortens the travel path of the discharged refrigerant supplied to the gas bearing.

[0075] In addition, a linear compressor with an easy-to-process and manufacture dispensing cap can be provided.

[0076] The effects that can be obtained in this invention are not limited to those mentioned above. Those skilled in the art to which this invention pertains can clearly understand other effects not mentioned from the following description. Attached Figure Description

[0077] To facilitate understanding of the present invention, the accompanying drawings, which are part of the detailed description, provide embodiments of the invention and illustrate the technical features of the invention in conjunction with the detailed description.

[0078] Figure 1 It is a cross-sectional view of the linear compressor disclosed in Patent Document 1.

[0079] Figure 2 and Figure 3 This is an exploded perspective view of a dispensing cap assembly according to an embodiment of the present invention.

[0080] Figure 4 and Figure 5 This is a perspective view of the first ejection chamber according to an embodiment of the present invention.

[0081] Figure 6 and Figure 7 This is a perspective view of the second ejection chamber according to an embodiment of the present invention.

[0082] Figure 8 and Figure 9 This is a perspective view of the ejector cap according to an embodiment of the present invention.

[0083] Figure 10 This is a cross-sectional view showing the main components of a linear compressor according to an embodiment of the present invention.

[0084] Figure 11 This is a bar chart comparing the noise measured at the rear of a refrigerator with a linear compressor as described in Patent Document 1 and the noise measured at the rear of a refrigerator with a linear compressor as described in an embodiment of the present invention.

[0085] Figure 12 It is a graph comparing the pulsation components of the linear compressor in Patent Document 1 and the linear compressor of an embodiment of the present invention. Detailed Implementation

[0086] Hereinafter, the embodiments disclosed in this specification will be described in detail with reference to the accompanying drawings. Unless otherwise specified in the drawing numbers, the same or similar components will be given the same reference numerals, and repeated descriptions thereof will be omitted.

[0087] When describing the embodiments disclosed in this specification, when referring to a constituent element as being "connected" or "linked" to another constituent element, it should be understood that it can be directly connected or linked to the other constituent element, but there may be other constituent elements in between.

[0088] Furthermore, when describing the embodiments disclosed in this specification, detailed descriptions of relevant well-known technologies are omitted if it is determined that such detailed descriptions may obscure the essence of the embodiments disclosed in this specification. Additionally, the accompanying drawings are provided only to facilitate understanding of the embodiments disclosed in this specification. The technical ideas disclosed in this specification are not limited to the drawings, but should be understood to include all modifications, equivalents, and substitutions made within the scope of the ideas and techniques of this specification.

[0089] On the other hand, a terminology discloser can be replaced by a terminology document, specification, description, etc.

[0090] First, refer to Figure 1 The general structure of a linear compressor is explained.

[0091] Figure 1 It is a cross-sectional view of the linear compressor disclosed in Patent Document 1.

[0092] Reference Figure 1 The linear compressor 100 may include a housing 111 and housing covers 112 and 113 connected to the housing 111. In a broader sense, housing covers 112 and 113 can be understood as a component of the housing 111.

[0093] A support leg can be attached to the underside of the housing 111. The support leg can be attached to the base of the product on which the linear compressor 100 is mounted.

[0094] For example, the product may include a refrigerator, and the base may include the refrigerator's mechanical compartment base. As another example, the product may include the outdoor unit of an air conditioner, and the base may include the outdoor unit's base.

[0095] The outer casing 111 can be generally cylindrical in shape and can be configured to be horizontally laid down or axially laid down.

[0096] by Figure 1 Based on this, the outer casing 111 can extend longer in the lateral direction and have a lower height in the radial direction. That is, the linear compressor 100 can have a lower height, so, for example, when the linear compressor 100 is installed in the base of the refrigerator's mechanical compartment, it has the advantage of being able to reduce the height of the mechanical compartment.

[0097] In addition, the longitudinal central axis of the outer casing 111 may be aligned with the central axis of the compressor body 100, which will be described later, and the central axis of the compressor body may be aligned with the central axis of the cylinder 140 and piston 150 that constitute the compressor body 100.

[0098] Terminals may be provided on the outer surface of the housing 111. The terminals can transmit external power to the drive unit 130 of the linear compressor 100. Specifically, the terminals can be connected to the leads of the coil 132b.

[0099] A bracket may be provided on the outside of the terminal block. The bracket may include a plurality of brackets surrounding the terminal block. The bracket serves to protect the terminal block from external impacts, etc.

[0100] The two sides of the outer casing 111 can be open. The outer casing covers 112 and 113 can be attached to the open sides of the outer casing 111.

[0101] Specifically, the outer casing covers 112 and 113 may include: a first outer casing cover 112, which is engaged with one open side of the outer casing 111; and a second outer casing cover 113, which is engaged with the other open side of the outer casing 111. The internal space of the outer casing 111 may be sealed by the outer casing covers 112 and 113.

[0102] by Figure 1 Based on this, the first housing cover 112 can be located on the right side of the linear compressor 100, and the second housing cover 113 can be located on the left side of the linear compressor 100. In other words, the first housing cover 112 and the second housing cover 113 can be configured to face each other.

[0103] Alternatively, it can be understood that the first outer cover 112 is located on the refrigerant suction side, and the second outer cover 113 is located on the refrigerant discharge side.

[0104] The linear compressor 100 may include a plurality of tubes disposed in the housing 111 or housing cover 112, 113 and capable of drawing in, discharging or injecting refrigerant.

[0105] The plurality of pipes may include: a suction pipe 114 for drawing refrigerant into the interior of the linear compressor 100; a discharge pipe 115 for discharging compressed refrigerant from the linear compressor 100; and a replenishment pipe for replenishing refrigerant to the linear compressor 100.

[0106] For example, the suction pipe 114 can be combined with the first housing cover 112. Refrigerant can be drawn into the interior of the linear compressor 100 axially through the suction pipe 114, and the refrigerant drawn into the interior of the linear compressor 100 can flow axially and be compressed.

[0107] The discharge pipe 115 can be engaged with the outer peripheral surface of the housing 111. The refrigerant compressed in the linear compressor 100 can be discharged through the discharge pipe 115. The discharge pipe 115 can be positioned closer to the second housing cover 113 than the first housing cover 112.

[0108] The replenishment pipe can be connected to the outer peripheral surface of the housing 111. Operators can inject refrigerant into the interior of the linear compressor 100 through the replenishment pipe.

[0109] To avoid interference with the ejector pipe 115, the replenishment pipe can be attached to the outer casing 111 at a different height than the ejector pipe 115. Here, height can be understood as the vertical distance from the outrigger. The ejector pipe 115 and the replenishment pipe are attached to the outer circumference of the outer casing 111 at different heights, thereby facilitating operation.

[0110] At least a portion of the second housing cover 113 may be disposed adjacent to the inner circumferential surface of the housing 111 corresponding to the location where the replenishment pipe is attached. In other words, at least a portion of the second housing cover 113 may act as a resistance to the refrigerant injected through the replenishment pipe.

[0111] Therefore, from the perspective of the refrigerant flow path, the size of the refrigerant flowing in through the replenishment pipe can be configured such that it becomes smaller due to the second outer casing cover 113 during the process of entering the internal space of the outer casing 111, and then becomes larger after passing through a part of the second outer casing cover 113.

[0112] During this process, the refrigerant pressure decreases, allowing it to vaporize and separating the oil components. As the oil-free refrigerant flows into the piston 150, its compressibility is improved. This oil can be understood as the working oil present in the cooling system.

[0113] The linear compressor 100 can be a component of the refrigeration cycle, and the fluid compressed by the linear compressor can be the refrigerant circulating in the refrigeration cycle.

[0114] In addition to the compressor, the refrigeration cycle can also include a condenser, an expansion unit, and an evaporator. Furthermore, linear compressors can be used as a component of the cooling system of refrigerators, but are not limited to this; they are widely used throughout industry.

[0115] The linear compressor 100 may include a housing 110 and a body housed inside the housing 110.

[0116] The compressor 100 body may include a frame 120, a cylinder 140 fixed to the frame 120, a piston 150 that performs linear reciprocating motion inside the cylinder 140, a drive unit 130 fixed to the frame 120 and applying driving force to the piston 150, etc.

[0117] Here, cylinder 140 and piston 150 can also be referred to as compression units 140 and 150.

[0118] The compressor 100 may include a bearing unit for reducing friction between the cylinder 140 and the piston 150. The bearing unit may be an oil bearing or a gas bearing. Alternatively, a mechanical bearing may be used as the bearing unit.

[0119] The compressor body 100 can be elastically supported by support springs 116 and 117 located at both ends of the inner side of the housing 110.

[0120] The support springs 116 and 117 may include a first support spring 116 at the rear of the support body and a second support spring 117 at the front of the support body.

[0121] The support springs 116 and 117 may include leaf springs and may support the internal components of the compressor body 100 and absorb vibrations and impacts generated by the reciprocating motion of the piston 150.

[0122] The housing 110 can form a sealed space. The sealed space may include: a receiving space 101 for receiving the drawn-in refrigerant; a suction space 102 filled with the refrigerant before compression; a compression space 103 for compressing the refrigerant; and a discharge space 104 filled with the compressed refrigerant.

[0123] The refrigerant drawn in from the suction pipe 114 connected to the rear side of the housing 110 can fill the receiving space 101. The refrigerant in the suction space 102, which is connected to the receiving space 101, is compressed in the compression space 103 and discharged into the discharge space 104, and then discharged to the outside through the discharge pipe 115 connected to the front side of the housing 110.

[0124] The housing 110 may include: an outer shell 111, open at both ends and formed into a cylindrical shape that is generally longer in the lateral direction; a first outer shell cover 112, which is coupled to the rear side of the outer shell 111; and a second outer shell cover 113, which is coupled to the front side of the outer shell 111.

[0125] Here, the front side, as shown on the left side of the attached diagram, refers to the side from which the compressed refrigerant is discharged, while the rear side, as shown on the right side of the attached diagram, refers to the side from which the refrigerant flows in.

[0126] In addition, the first outer cover 112 or the second outer cover 113 can be integrally formed with the outer cover 111.

[0127] The housing 110 can be formed of a thermally conductive material. As a result, the heat generated in the internal space of the housing 110 can be quickly dissipated to the outside.

[0128] The first outer cover 112 can be combined with the outer cover 111 to seal the rear side of the outer cover 111, and an inhalation tube 114 can be inserted and combined in the center of the first outer cover 112.

[0129] The rear side of the compressor body 100 can be elastically supported in the radial direction of the first housing cover 112 by the first support spring 116.

[0130] The first support spring 116 may include a circular leaf spring. The edge of the first support spring 116 may be elastically supported in the forward direction relative to the rear cover 123 by the support bracket 123a.

[0131] The open central portion of the first support spring 116 can be supported in the rearward direction relative to the first outer casing 112 by the suction guide 116a.

[0132] A through flow path can be formed inside the suction guide 116a. The suction guide 116a can be formed in a cylindrical shape.

[0133] The central opening of the first support spring 116 can be integrated into the front outer peripheral surface of the suction guide 116a, and the rear end of the suction guide 116a can be supported on the first outer casing 112. At this time, an additional suction-side support member 116b can be provided between the inner surface of the suction guide 116a and the first outer casing 112.

[0134] The rear side of the intake guide 116a can be connected to the intake pipe 114, and the refrigerant drawn in through the intake pipe 114 can flow smoothly into the muffler unit 160 described later via the intake guide 116a.

[0135] A damping member 116c may be disposed between the intake guide 116a and the intake-side support member 116b. The damping member 116c may be formed of a rubber material or the like. This prevents vibrations that may occur during the intake of refrigerant through the intake pipe 114 from being transmitted to the first outer casing 112.

[0136] The second outer cover 113 can be combined with the outer cover 111 to seal the front side of the outer cover 111. The second outer cover 113 can be inserted through an annular tube 115a and combined with a discharge tube 115.

[0137] The refrigerant discharged from the compression space 103 can be discharged into the refrigeration cycle via the annular pipe 115a and the discharge pipe 115 after passing through the discharge cap assembly 180.

[0138] The front side of the compressor body 100 can be elastically supported in the radial direction of the housing 111 or the second housing cover 113 by the second support spring 117.

[0139] The second support spring 117 may include a circular leaf spring. The open central portion of the second support spring 117 may be supported in a rearward direction relative to the ejector cap assembly 180 by the first support guide 117b.

[0140] The edge of the second support spring 117 can be supported in the forward direction by the support bracket 117a relative to the inner side of the outer casing 111 or the inner circumferential surface of the outer casing 111 adjacent to the second outer casing cover 113.

[0141] and Figure 1 In contrast, the edge of the second support spring 117 can also be supported in the forward direction relative to the inner side of the housing 111 or the inner circumference of the housing 111 adjacent to the second housing cover 113 by an additional bracket (not shown) combined with the second housing cover 113.

[0142] The first support guide 117b can be formed in a cylindrical shape. The cross-section of the first support guide 117b may include a plurality of diameters.

[0143] The front side of the first support guide 117b can be inserted into the central opening of the second support spring 117, and the rear side of the first support guide 117b can be connected to the ejector cap assembly 180.

[0144] The support cover 117c can be engaged with the front side of the first support guide 117b via the second support spring 117. A cup-shaped second support guide 117d that is recessed forward can be engaged with the front side of the support cover 117c.

[0145] A cup-shaped third support guide 117e, corresponding to the second support guide 117d and recessed rearward, can be attached to the inside of the second outer cover 113.

[0146] The second support guide 117d can be inserted into the inside of the third support guide 117e and supported axially and / or radially. At this time, a gap can be formed between the second support guide 117d and the third support guide 117e.

[0147] The frame 120 may include: a main body 121 that supports the outer peripheral surface of the cylinder 140; and a first flange 122 that connects to one side of the main body 121 and supports the drive unit 130. The frame 120, together with the drive unit 130 and the cylinder 140, may be elastically supported relative to the housing 110 by a first support spring 116 and a second support spring 117.

[0148] The main body 121 may surround the outer peripheral surface of the cylinder 140. The main body 121 may be formed in a cylindrical shape. The first flange 122 may be formed extending radially from the front end of the main body 121.

[0149] A cylinder 140 may be attached to the inner circumferential surface of the main body 121. An inner stator 134 may be attached to the outer circumferential surface of the main body 121.

[0150] For example, cylinder 140 can be press-fitted and fixed to the inner circumferential surface of main body 121, and inner stator 134 can be fixed to the outer circumferential surface of main body 121 using an additional retaining ring (not shown).

[0151] An outer stator 131 may be attached to the rear side of the first flange portion 122, and a discharge cap assembly 180 may be attached to the front side of the first flange portion 122.

[0152] For example, the outer stator 131 and the ejector cap assembly 180 can be fixed by a mechanical coupling unit.

[0153] A bearing inlet groove 125a, which forms part of the gas bearing, can be formed on one side of the front surface of the first flange portion 122. A first bearing communication hole 125b, which extends from the bearing inlet groove 125a to the inner peripheral surface of the main body portion 121, can be formed on the main body portion 121. A gas groove 125c, which communicates with the first bearing communication hole 125b, can be formed on the inner peripheral surface of the main body portion 121.

[0154] The bearing inlet groove 125a can be formed by recessing a predetermined depth in the axial direction, and the first bearing connecting hole 125b, which is a hole with a cross-sectional area smaller than that of the bearing inlet groove 125a, can be formed obliquely toward the inner circumferential surface or inner side surface of the main body 121.

[0155] Furthermore, the gas groove 125c can be formed as an annular shape having a predetermined depth and axial length on the inner circumferential surface of the main body 121. In contrast, the gas groove 125c can be formed on the outer circumferential surface of the cylinder 140 that is in contact with the inner circumferential surface of the main body 121, or it can be formed on both the inner circumferential surface of the main body 121 and the outer circumferential surface of the cylinder 140.

[0156] Additionally, a gas inlet 142 corresponding to the gas groove 125c can be formed on the outer peripheral surface of the cylinder 140. The gas inlet 142 forms a nozzle portion in the gas bearing.

[0157] The frame 120 and cylinder 140 can be formed of aluminum or aluminum alloy.

[0158] The cylinder 140 can be formed into a cylindrical shape with open ends. The piston 150 can be inserted through the rear end of the cylinder 140. The front end of the cylinder 140 can be closed by the discharge valve assembly 170.

[0159] A compression space 103 may be formed between the front end of the cylinder 140 and piston 150 and the discharge valve assembly 170. Here, the front end of piston 150 may be referred to as head 151.

[0160] The volume of the compression space 103 increases as the piston 150 retracts and decreases as the piston 150 advances. That is, the refrigerant flowing into the interior of the compression space 103 can be compressed as the piston 150 advances and discharged through the discharge valve assembly 170.

[0161] The cylinder 140 may include a second flange 141 disposed at its front end. The second flange 141 may be bent outward of the cylinder 140. The second flange 141 may extend along the outer periphery of the cylinder 140.

[0162] The second flange portion 141 of the cylinder 140 can be coupled to the frame 120. For example, a flange groove corresponding to the second flange portion 141 of the cylinder 140 can be formed at the front end of the frame 120, and the second flange portion 141 of the cylinder 140 can be inserted into the flange groove and coupled by a coupling member.

[0163] An O-ring 124 may be formed between the frame 120 and the second flange portion 141 of the cylinder 140. The O-ring 124 can seal the space between the frame 120 and the second flange portion 141 of the cylinder 140 to prevent refrigerant from leaking forward through the frame 120 and the second flange portion 141 of the cylinder 140.

[0164] The O-ring 124 may include: a first O-ring 124a disposed behind the second flange portion 141 of the cylinder 140; and a second O-ring 124b disposed in front of the second flange portion 141 of the cylinder 140.

[0165] On the other hand, a gas bearing unit can be provided, which can provide gas lubrication between the cylinder 140 and the piston 150 by supplying a portion of the refrigerant to the space between the outer peripheral surface of the piston 150 and the inner peripheral surface of the cylinder 140.

[0166] The refrigerant supplied between cylinder 140 and piston 150 can provide levitation force to piston 150, thereby reducing friction between piston 150 and cylinder 140.

[0167] For example, cylinder 140 may include a gas inlet 142. The gas inlet 142 may communicate with a gas groove 125c formed on the inner circumferential surface of the main body 121.

[0168] The gas inlet 142 can penetrate the cylinder 140 radially. The gas inlet 142 can guide the compressed refrigerant flowing into the gas tank 125c between the inner circumferential surface of the cylinder 140 and the outer circumferential surface of the piston 150.

[0169] In contrast, considering ease of processing, the gas groove 125c can also be formed on the outer circumferential surface of the cylinder 140.

[0170] The inlet of the gas inlet 142 can be relatively wide, and the outlet can be a small through-hole to function as a nozzle. A filter (not shown) to block the inflow of foreign objects can be added to the inlet of the gas inlet 142. The filter can be a mesh filter made of metal, or it can be formed by winding fine wire or other components.

[0171] A plurality of gas inlets 142 may be formed independently. Gas inlets 142 may be formed only on the front side, with the axial center of the cylinder 140 as a reference. In contrast, considering the downward movement of the piston 150, gas inlets 142 may also be formed on the rear side, with the axial center of the cylinder 140 as a reference.

[0172] The piston 150 is configured to be inserted into the open end of the cylinder 140 and to seal the rear of the compression space 103.

[0173] The piston 150 may include a head 151 and a guide portion 152. The head 151 may be formed in a disk shape. The head 151 may be partially open. The head 151 may divide a compression space 103.

[0174] The guide portion 152 can extend rearward from the outer periphery of the head 151. The guide portion 152 can be formed into a cylindrical shape. The interior of the guide portion 152 can be hollow, and a portion of the front of the guide portion 152 can be sealed by the head 151.

[0175] The rear of the guide portion 152 may be open and connected to the muffler unit 160. The head 151 may be configured as an additional component that combines with the guide portion 152. In contrast, the head 151 and the guide portion 152 may be formed as a single unit.

[0176] The piston 150 may include a suction port 154. The suction port 154 may extend through the head 151. The suction port 154 may connect the suction space 102 and the compression space 103 inside the piston 150.

[0177] For example, refrigerant flowing from the containment space 101 into the intake space 102 inside the piston 150 can be drawn into the compression space 103 between the piston 150 and the cylinder 140 via the intake port 154.

[0178] The intake port 154 may extend along the axial direction of the piston 150. The intake port 154 may be formed to be inclined to the axial direction of the piston 150. For example, the intake port 154 may extend in a direction that is increasingly inclined toward the central axis as it moves toward the rear of the piston 150.

[0179] The cross-section of the suction port 154 can be circular. The suction port 154 can be configured to have a constant inner diameter. Alternatively, the suction port 154 can be configured as an elongated hole with an opening extending radially along the head 151, or its inner diameter can be configured to increase towards the rear.

[0180] The suction port 154 may be formed in a plurality of directions in either the radial or circumferential directions of the head 151.

[0181] A suction valve 155, which selectively opens and closes the suction port 154, can be installed at the head 151 of the piston 150 adjacent to the compression space 103. The suction valve 155 can be actuated by elastic deformation to open or close the suction port 154.

[0182] That is, the suction valve 155 can elastically deform into an open suction port 154 under the pressure of the refrigerant flowing through the suction port 154 to the compression space 103. The suction valve 155 can be a lead valve, but is not limited to this and can be modified in different ways.

[0183] The piston 150 can be connected to the movable member 135. The movable member 135 can reciprocate in the back-and-forth direction as the piston 150 moves. An inner stator 134 and a cylinder 140 can be disposed between the movable member 135 and the piston 150.

[0184] The movable part 135 and the piston 150 can be connected to each other by a magnet frame 136 formed from the rear, bypassing the cylinder 140 and the inner stator 134.

[0185] The muffler unit 160 can be coupled to the rear of the piston 150 to attenuate the noise generated during the process of refrigerant being drawn into the piston 150. The refrigerant drawn in through the suction pipe 114 can flow through the muffler unit 160 into the suction space 102 inside the piston 150.

[0186] The muffler unit 160 may include: an intake muffler 161 in communication with the receiving space 101 of the housing 110; and an internal guide 162 connected to the front of the intake muffler 161 to guide refrigerant to the intake port 154.

[0187] The inhalation muffler 161 can be located behind the piston 150, the rear opening of the inhalation muffler 161 can be configured adjacent to the inhalation pipe 114, and the front end of the inhalation muffler 161 can be connected to the rear of the piston 150.

[0188] The intake muffler 161 may have an axial flow path to guide the refrigerant in the receiving space 101 to the intake space 102 inside the piston 150.

[0189] The interior of the intake muffler 161 can be divided into a plurality of noise spaces by partitions. The intake muffler 161 can be formed by combining two or more components together; for example, a plurality of noise spaces can be formed by pressing a second intake muffler into the interior of a first intake muffler. Furthermore, considering weight or insulation, the intake muffler 161 can be made of plastic material.

[0190] One side of the internal guide 162 can communicate with the noise space of the intake muffler 161, and the other side of the internal guide 162 can be inserted deeper into the interior of the piston 150.

[0191] The internal guide 162 can be formed in a tubular shape. Both ends of the internal guide 162 can have the same inner diameter. Alternatively, the internal guide 162 can be formed in a cylindrical shape. In another configuration, the inner diameter of the front end (as the discharge side) can be larger than the inner diameter of the rear end (as the opposite side).

[0192] The intake muffler 161 and the internal guide 162 can be formed in various shapes, and can be used to regulate the pressure of the refrigerant passing through the muffler unit 160. The intake muffler 161 and the internal guide 162 can also be formed as a single unit.

[0193] The discharge valve assembly 170 may include: a discharge valve 171; a valve spring 172 disposed on the front side of the discharge valve 171 to elastically support the discharge valve 171; and a spring support member 173, which is combined with the discharge cover assembly 180 and supports the valve spring 172.

[0194] The discharge valve assembly 170 can selectively discharge refrigerant compressed in the compression space 103. Here, the compression space 103 refers to the space formed between the suction valve 155 and the discharge valve 171.

[0195] The discharge valve 171 can be configured in a supportable manner on the front of the cylinder 140. The discharge valve 171 can selectively open and close the front opening of the cylinder 140.

[0196] The discharge valve 171 can be actuated by elastic deformation, thereby opening or closing the compression space 103. The discharge valve 171 can be elastically deformed to open the compression space 103 under the pressure of the refrigerant flowing through the compression space 103 to the discharge space 104.

[0197] For example, when the discharge valve 171 is supported on the front of the cylinder 140, the compression space 103 can remain closed, and when the discharge valve 171 is separated from the front of the cylinder 140, the compressed refrigerant in the compression space 103 can be discharged into the discharge space 104.

[0198] The discharge valve 171 can be a reed valve, but is not limited to this.

[0199] The valve spring 172 can be disposed between the discharge valve 171 and the discharge cover assembly 180 and provide spring force in the axial direction.

[0200] The valve spring 172 can also be a compression coil spring, or, considering space or reliability, a leaf spring.

[0201] If the pressure in the compression space 103 is above the discharge pressure, the valve spring 172 deforms forward to open the discharge valve 171, allowing refrigerant to be discharged from the compression space 103 and into the first discharge space 104a of the discharge cover assembly 180. Once the refrigerant has been completely discharged, the valve spring 172 can provide a restoring force to the discharge valve 171, thereby closing the discharge valve 171.

[0202] The following describes the process by which refrigerant flows into the compression space 103 through the suction valve 155 and is discharged into the discharge space 104 through the discharge valve 171.

[0203] During the reciprocating linear motion of piston 150 inside cylinder 140, if the pressure in compression space 103 becomes below the predetermined suction pressure, refrigerant is drawn into compression space 103 by opening suction valve 155.

[0204] Conversely, if the pressure in the compression space 103 exceeds the predetermined suction pressure, the refrigerant in the compression space 103 is compressed with the suction valve 155 closed.

[0205] On the other hand, during the reciprocating linear motion of the piston 150 inside the cylinder 140, if the pressure of the compression space 103 is above the predetermined discharge pressure, the valve spring 172 deforms forward and opens the discharge valve 171 connected to it, and the refrigerant is discharged from the compression space 103 to the discharge space 104 of the discharge cover assembly 180.

[0206] Once the refrigerant has been completely discharged, the discharge valve 171 closes under the action of the valve spring 172, sealing off the front of the compression space 103.

[0207] The drive unit 130 may include: an outer stator 131 configured to surround the main body 121 of the frame 120 between the housing 111 and the frame 120; an inner stator 134 configured to surround the cylinder 140 between the outer stator 131 and the cylinder 140; and a moving member 135 configured between the outer stator 131 and the inner stator 134.

[0208] The outer stator 131 can be coupled to the rear of the first flange portion 122 of the frame 120, and the inner stator 134 can be coupled to the outer peripheral surface of the main body portion 121 of the frame 120.

[0209] Furthermore, the inner stator 134 can be configured to be spaced inward from the outer stator 131, and the movable member 135 can be configured in the space between the outer stator 131 and the inner stator 134.

[0210] The outer stator 131 may be fitted with a winding coil, and the moving part 135 may include a permanent magnet.

[0211] A permanent magnet can consist of a single magnet with one pole, or it can consist of a combination of multiple magnets with three poles.

[0212] The outer stator 131 may include: a coil winding body 132, which surrounds the axial direction in the circumferential direction; and a stator core 133, which surrounds the coil winding body 132 and is stacked.

[0213] The coil winding body 132 may include a hollow cylindrical spool 132a and a coil 132b wound along the circumferential direction of the spool 132a.

[0214] The cross-section of coil 132b can be formed as a circle or a polygon; for example, it can have a hexagonal shape.

[0215] The stator core 133 can also be composed of a plurality of lamination sheets stacked radially, or it can be composed of a plurality of lamination blocks stacked along the circumferential direction.

[0216] The front side of the outer stator 131 can be supported by the first flange 122 of the frame 120, and the rear side of the outer stator 131 can be supported by the stator cover 137.

[0217] The stator cover 137 can be formed into a hollow disc shape. The front of the stator cover 137 can support the outer stator 131, and the rear of the stator cover 137 can support the resonant spring 118.

[0218] The inner stator 134 can be formed by stacking a plurality of laminations or blocks along the circumferential direction on the outer peripheral surface of the main body 121 of the frame 120.

[0219] One side of the movable member 135 can be coupled to and supported by the magnet frame 136. The magnet frame 136 can be generally cylindrical and can be configured to be inserted into the space between the outer stator 131 and the inner stator 134. In addition, the magnet frame 136 can be configured to engage with the rear side of the piston 150 and move together with the piston 150.

[0220] The rear end of the magnet frame 136 can be bent and extended radially inward to form a first joint 136a, which can be joined with a third flange 153 formed at the rear of the piston 150.

[0221] The first joint 136a of the magnet frame 136 and the third flange 153 of the piston 150 can be joined by a mechanical joint member.

[0222] A fourth flange 161a may be provided between the third flange 153 of the piston 150 and the first joint 136a of the magnet frame 136, which is formed in front of the intake muffler 161.

[0223] Therefore, the piston 150, the muffler unit 160, and the moving part 135 can move linearly and reciprocally as a single unit.

[0224] If current is applied to the drive unit 130, a magnetic flux is formed in the winding coil. Electromagnetic force can be generated by the interaction between the magnetic flux formed in the winding coil of the outer stator 131 and the magnetic flux formed by the permanent magnet of the moving member 135, thereby causing the moving member 135 to move.

[0225] Furthermore, when the moving member 135 reciprocates along the axial direction, the piston 150 connected to the magnet frame 136 can also reciprocate along the axial direction integrally with the moving member 135.

[0226] On the other hand, the drive unit 130 and the compression units 140 and 150 can be axially supported by the support springs 116 and 117 and the resonant spring 118.

[0227] The resonant spring 118 can effectively compress the refrigerant by amplifying the vibrations generated by the reciprocating motion of the moving part 135 and the piston 150.

[0228] Specifically, the resonant spring 118 can be adjusted to a vibration frequency corresponding to the natural vibration frequency of the piston 150, enabling the piston 150 to resonate. Furthermore, the resonant spring 118 can reduce vibration and noise generation by stabilizing the movement of the piston 150.

[0229] The resonant spring 118 can be a helical spring extending axially. The two ends of the resonant spring 118 can be connected to the vibrating body and the fixed body, respectively. For example, one end of the resonant spring 118 can be connected to the magnet frame 136, and the other end of the resonant spring 118 can be connected to the rear cover 123.

[0230] Therefore, the resonant spring 118 can elastically deform between the vibrating body and the fixed body, wherein the vibrating body vibrates at one end of the resonant spring 118 and the fixed body is fixed to the other end of the resonant spring 118.

[0231] The natural vibration frequency of the resonant spring 118 can be designed to match the resonant frequency of the moving part 135 and the piston 150 to increase the reciprocating motion of the piston 150.

[0232] However, the rear cover 123, which is set as a fixed body, is elastically supported to the housing 110 by the first support spring 116, so it may not be fixed in a strict sense.

[0233] The resonant spring 118 may include: a first resonant spring 118a, which is supported on the rear side with reference to the spring support member 119; and a second resonant spring 118b, which is supported on the front side with reference to the spring support member 119.

[0234] The spring support 119 may include: a main body 119a surrounding the intake muffler 161; a second connecting part 119b bent radially inward from the front of the main body 119a; and a support part 119c bent radially outward from the rear of the main body 119a.

[0235] The front of the second joint 119b of the spring support 119 can be supported by the first joint 136a of the magnet frame 136. The inner diameter of the second joint 119b of the spring support 119 can surround the outer diameter of the intake muffler 161.

[0236] For example, the second joint 119b of the spring support 119, the first joint 136a of the magnet frame 136, and the third flange 153 of the piston 150 can be mechanically joined together after being arranged in sequence.

[0237] At this time, as described above, the fourth flange portion 161a of the intake muffler 161 can be disposed between the third flange portion 153 of the piston 150 and the first joint portion 136a of the magnet frame 136 and fixed together.

[0238] The first resonant spring 118a can be disposed between the front of the rear cover 123 and the rear of the spring support 119. The second resonant spring 118b can be disposed between the rear of the stator cover 137 and the front of the spring support 119.

[0239] A plurality of first resonant springs 118a and second resonant springs 118b may be configured. The first resonant springs 118a and second resonant springs 118b may be arranged side by side in the axial direction or may be arranged alternately.

[0240] The first resonant spring 118a and the second resonant spring 118b can be arranged at predetermined intervals in the radial direction of the central axis. For example, three of each of the first resonant spring 118a and the second resonant spring 118b can be provided and arranged at 120-degree intervals in the radial direction of the central axis.

[0241] The compressor 100 may include a sealing member capable of increasing the bonding force between the frame 120 and its surrounding components. For example, the sealing member may be inserted into a mounting groove provided on the outer side of the frame 120 and disposed at the junction of the frame 120 and the inner stator 134. Here, the sealing member may have a ring shape.

[0242] The operation of the linear compressor 100 described above is as follows.

[0243] First, if current is switched to the drive unit 130, magnetic flux can be formed in the outer stator 131 due to the current flowing in the coil 132b.

[0244] The magnetic flux formed in the outer stator 131 generates electromagnetic force, and the moving part 135, which is equipped with a permanent magnet, can perform linear reciprocating motion under the action of the generated electromagnetic force.

[0245] Such electromagnetic force can be generated in the direction of piston 150 toward top dead center (TDC) during the compression stroke (forward direction), and in the direction of piston 150 toward bottom dead center (BDC) during the intake stroke (rear direction).

[0246] That is, the drive unit 130 can generate a thrust that pushes the moving member 135 and the piston 150 along the moving direction.

[0247] The piston 150, which performs linear reciprocating motion inside the cylinder 140, can repeatedly increase or decrease the volume of the compression space 103.

[0248] If the piston 150 moves in the direction that increases the volume of the compression space 103 (rearward direction), the pressure in the compression space 103 can be reduced.

[0249] Therefore, the suction valve 155 installed in front of the piston 150 is opened, and the refrigerant remaining in the suction space 102 can be sucked into the compression space 103 through the suction port 154.

[0250] This intake stroke can continue until the piston 150 increases the volume of the compression space 103 to its maximum and reaches the bottom dead center.

[0251] Once the piston 150 reaches the bottom dead center, it can move in the direction that reduces the volume of the compression space 103 (forward direction) and perform the compression stroke.

[0252] During the compression stroke, as the pressure in the compression space 103 increases, the refrigerant in the compression space 103 can be compressed.

[0253] If the pressure in the compression space 103 reaches the set pressure, the discharge valve 171 is pushed open and opens from the cylinder 140 under the action of the pressure in the compression space 103, and the refrigerant in the compression space 103 can be discharged into the discharge space 104.

[0254] Such a compression stroke can continue while the piston 150 moves to the top dead center, which minimizes the volume of the compression space 103.

[0255] As the piston 150 repeatedly performs its intake and compression strokes, the refrigerant flowing into the containment space 101 inside the compressor 100 through the intake pipe 114 can sequentially flow into the intake space 102 inside the piston 150 via the intake guide 116a, the intake muffler 161, and the internal guide 162. The refrigerant in the intake space 102 can then flow into the compression space 103 inside the cylinder 140 during the intake stroke of the piston 150.

[0256] During the compression stroke of piston 150, after the refrigerant in compression space 103 is discharged into discharge space 104, a flow of refrigerant can be formed to discharge to the outside of compressor 100 via annular pipe 115a and discharge pipe 115.

[0257] The discharge cover assembly 180 of the linear compressor 100 may include a discharge cover 185, a first discharge chamber 181 and a second discharge chamber 183, and the discharge valve assembly 170 may include a discharge valve 171, a valve spring 172 and a spring support member 173.

[0258] The discharge cap assembly 180 can be positioned in front of the compression space 103 to form a discharge space 104 for receiving refrigerant discharged from the compression space 103, and can be combined with the front of the frame 120 to attenuate noise generated during the discharge of refrigerant from the compression space 103.

[0259] The ejector cap assembly 180 can be engaged with the front of the first flange 122 of the frame 120.

[0260] The dispensing cap assembly 180 can accommodate the dispensing valve assembly 170. For example, a spring support member 173 of the dispensing valve assembly 170 can be incorporated in the rear inner region of the first dispensing chamber 181 of the dispensing cap assembly 180.

[0261] The ejector cap assembly 180 may include an ejector cap 185. The ejector cap 185 may be formed as a rear opening. The ejector cap 185 may be coupled to the frame 120.

[0262] The back of the ejector cap 185 can be engaged with the front of the first flange portion 122 of the frame 120, and a sealing member 190 can be disposed between the ejector cap 185 and the frame 120.

[0263] An internal space can be formed in the space between the inner side of the ejector cap 185, the inner side of the frame 120, and the piston 150.

[0264] The interior space of the discharge cover 185 may be configured with a first discharge chamber 181, a second discharge chamber 183, a discharge valve assembly 170, a retaining ring 188, and a damper 189.

[0265] The first discharge chamber 181 may be disposed inside the discharge cover 185. The first discharge chamber 181 may include a plurality of partition walls for dividing the internal space of the discharge cover 185 into a plurality of discharge spaces 104a, 104b, 104c. The first discharge chamber 181 may be disposed in front of the discharge valve assembly 170. The first discharge chamber 181 may be disposed behind the second discharge chamber 183.

[0266] The first discharge chamber 181 can be formed of aluminum.

[0267] The first discharge space 104a can be selectively connected to the compression space 103 through the discharge valve 171, the second discharge space 104b can be connected to the first discharge space 104a, and the third discharge space 104c can be connected to the second discharge space 104b.

[0268] Thus, the refrigerant discharged from the compression space 103 can pass sequentially through the first discharge space 104a, the second discharge space 104b, and the third discharge space 104c, attenuating the discharge noise, and then be discharged to the outside of the housing 110 through the annular pipe 115a and the discharge pipe 115 connected to the discharge cover 185.

[0269] The second discharge chamber 183 can be disposed inside the discharge cover 185. The second discharge chamber 183 can be disposed in front of the first discharge chamber 181.

[0270] Furthermore, the second discharge chamber 183 can be made of aluminum. This prevents the heat of the refrigerant passing through the plurality of discharge spaces 104a, 104b, 104c from being transferred to the discharge cover 185 through the second discharge chamber 183.

[0271] A retaining ring 188 can be disposed between the first discharge chamber 181 and the discharge valve assembly 170. The retaining ring 188 can be formed in an annular shape. The retaining ring 188 can be formed in a ring shape. The retaining ring 188 can securely fix the discharge valve assembly 170 to the interior of the discharge cap assembly 180 by being pressed between the spring support member 173 of the discharge valve assembly 170 and the first discharge chamber 181.

[0272] The damper 189 can be disposed between the first discharge chamber 181 and the discharge valve assembly 170. When the piston 150 reciprocates axially, the damper 189 can prevent the axial vibration of the discharge valve assembly 170 from affecting the discharge cover assembly 180.

[0273] A sealing member 190 may be disposed between the discharge cap assembly 180 and the frame 120. The sealing member 190 can prevent refrigerant flowing inside the discharge cap assembly 180 from leaking into the space between the discharge cap assembly 180 and the frame 120.

[0274] The sealing member 190 may include a first sealing member 190b. The first sealing member 190b may be disposed between the discharge cap 185 and the first flange 122 of the frame 120.

[0275] The sealing member 190 may include a second sealing member 190a. The second sealing member 190a may be disposed between the discharge cap 185 and the frame 120. The second sealing member 190a may be formed in an annular shape.

[0276] In this type of linear compressor, the high-temperature refrigerant can be prevented from directly contacting the discharge cover through the first discharge chamber and the second discharge chamber, thus having the effect of slightly suppressing the transfer of heat from the discharged refrigerant to the discharge cover and the frame attached thereto.

[0277] but, Figure 1 Linear compressors suffer from weak rigidity due to the simple structure of their discharge chambers.

[0278] In addition, because the volume of the ejection space formed by the ejection chamber is relatively large, it has the problem of loud noise caused by ejection pulsation.

[0279] In addition, the discharge chamber is simply inserted into or pressed into the discharge cover, which means that the knocking noise of the discharge valve, which is the main noise source of the linear compressor, cannot be reduced.

[0280] The following is for reference Figures 2 to 12 The embodiments of the present invention are described below.

[0281] Embodiments of the present invention relate to a dispensing cap assembly, the remaining components of which are the same as those of the present invention. Figure 1 The linear compressors shown have the same or similar configurations.

[0282] That is, the ejector cap assembly of the present invention can be used instead of the original. Figure 1 The discharge cap assembly of the linear compressor is shown.

[0283] Therefore, the discharge cap assembly of the present invention will be described in detail below, and the description of the other components of the linear compressor other than the discharge cap assembly will be omitted.

[0284] Furthermore, in describing embodiments of the present invention, the following applies to... Figure 1 The same components of the linear compressor shown are given the same reference numerals, and detailed descriptions thereof are omitted.

[0285] Figure 2 and Figure 3 This is an exploded perspective view of a dispensing cap assembly according to an embodiment of the present invention.

[0286] Figure 4 and Figure 5 This is a perspective view of the first ejection chamber according to an embodiment of the present invention.

[0287] Figure 6 and Figure 7 This is a perspective view of the second ejection chamber according to an embodiment of the present invention.

[0288] Figure 8 and Figure 9 This is a perspective view of the ejector cap according to an embodiment of the present invention.

[0289] Figure 10 This is a cross-sectional view showing the main components of a linear compressor according to an embodiment of the present invention.

[0290] Figure 11 This is a bar chart comparing the noise measured at the rear of a refrigerator with a linear compressor as described in Patent Document 1 and the noise measured at the rear of a refrigerator with a linear compressor as described in an embodiment of the present invention.

[0291] Figure 12 It is a graph comparing the pulsation components of the linear compressor in Patent Document 1 and the linear compressor of an embodiment of the present invention.

[0292] The ejector cap assembly 1800 of this embodiment may include a first ejector chamber 1810, a second ejector chamber 1830, and an ejector cap 1850.

[0293] The ejector cap assembly 1800 can be engaged with the front of the first flange 122 of the frame 120. For example, the ejector cap assembly 1800 can be engaged with the first flange 122 by means of a mechanical engagement member.

[0294] The dispensing cap assembly 1800 can accommodate the dispensing valve assembly 170. For example, a spring support member 173 of the dispensing valve assembly 170 can be incorporated in the rear inner region of the first dispensing chamber 1810 of the dispensing cap assembly 1800.

[0295] The first discharge chamber 1810 can be disposed within the interior space of the discharge cover 1850. The first discharge chamber 1810 can be disposed in front of the discharge valve assembly 170. The first discharge chamber 1810 can be disposed behind the second discharge chamber 1830.

[0296] The first discharge chamber 1810 may be formed of a material having a different thermal conductivity than the material forming the discharge cover 1850, such as polyamide 66 (PA66).

[0297] Polyamide 66 has excellent mechanical strength and heat resistance, making it suitable as a material for the first discharge chamber 1810.

[0298] The first discharge chamber 1810 may be configured as a rear-opening shape. The first discharge chamber 1810 includes: a first cylindrical member 1811 forming a first discharge space 1040a for refrigerant to flow into through the discharge valve 171; a first bottom member 1813 supporting the first cylindrical member 1811; and a first wall member 1815, which is annular in shape, protrudes from the first bottom member 1813 and surrounds the first cylindrical member 1811.

[0299] A first column member 1817 is provided at the center of the first cylindrical member 1811, protruding rearward to a predetermined depth toward the discharge valve assembly 170. A plurality of first discharge holes H1 are formed on the bottom surface of the first column member 1817 for discharging the refrigerant flowing in through the discharge valve 171 into the second discharge space 1040b of the second discharge chamber 1830. The plurality of first discharge holes H1 are formed through the bottom surface of the first column member 1817.

[0300] Therefore, the first discharge space 1040a of the first discharge chamber 1810 and the second discharge space 1040b of the second discharge chamber 1830 are interconnected through a plurality of first discharge holes H1.

[0301] The first bottom member 1813 has a first stepped portion 1813a and a second stepped portion 1813b, and a first cylindrical member 1811 and a first column member 1817 protrude from the second stepped portion 1813b toward the ejector cap 1850.

[0302] A plurality of first reinforcing ribs R1 may be formed on the inner wall of the first cylindrical member 1811, protruding from the inner wall of the first cylindrical member 1811 towards the first discharge space 1040a and extending axially.

[0303] According to this configuration, the strength of the wall of the first cylindrical member 1811 is increased by the plurality of first reinforcing ribs R1.

[0304] A second reinforcing rib R2 in the shape of a ring protruding toward the first ejection space 1040a can be formed on the inner side of the upper surface of the first cylindrical member 1811.

[0305] According to this configuration, the strength of the upper surface of the first cylindrical member 1811 is increased by the second reinforcing rib R2.

[0306] In addition, a plurality of third reinforcing ribs R3 are formed on the inner wall of the first column member 1817, protruding from the inner wall of the first column member 1817 toward the first ejection space 1040a and extending axially.

[0307] According to this configuration, the strength of the first column member 1817 is increased by the plurality of third reinforcing ribs R3.

[0308] In addition, a fourth reinforcing rib R4 is formed on the outer wall of the first column member 1817, which spatially divides a plurality of first ejection holes H1.

[0309] When there are four first discharge holes H1, the fourth reinforcing rib R4 can be formed in a cross shape to divide the space formed by the first column member 1817 into four.

[0310] The first reinforcing rib R1 and the third reinforcing rib R3 can be formed in the same number and can be formed in positions facing each other.

[0311] In addition, the second reinforcing rib R2 may include a bridging portion R22 that connects to the first reinforcing rib R1 and the third reinforcing rib R3.

[0312] In this case, the first reinforcing rib R1, the second reinforcing rib R2, and the third reinforcing rib R3 can be formed as a single unit.

[0313] Based on this configuration, the strength of the first discharge chamber 1810 can be effectively increased by using the first reinforcing rib R1 to the third reinforcing rib R3.

[0314] Furthermore, a plurality of fifth reinforcing ribs R5 protruding toward the first ejection space 1040a can be formed on the inner wall surface of the first bottom member 1813.

[0315] According to this configuration, the strength of the first bottom member 1813 is increased by the plurality of fifth reinforcing ribs R5.

[0316] A second bearing communication hole H2 is formed in a portion of the first bottom member 1813, which is respectively connected to the first bearing communication hole 125b and the third discharge space 1040c.

[0317] That is, the second bearing connecting hole H2 is formed in the first bottom member 1813 as part of the third ejection space 1040c.

[0318] Therefore, a portion of the refrigerant in the third discharge space 1040c can flow through the second bearing connecting hole H2 to the first bearing connecting hole 125b.

[0319] With this configuration, compared to the linear compressor in Patent Document 1, which has an additional second bearing communication hole formed in the discharge cover 185, the path for supplying refrigerant to the gas bearing can be shortened, thus enabling efficient lubrication of the gas bearing. Furthermore, the processability and manufacturability of the discharge cover 1850 can be improved.

[0320] The diameter and / or size of the second bearing connecting hole H2 can be made smaller than the diameter of the first bearing connecting hole 125b. This allows for appropriate adjustment of the amount of refrigerant supplied to the gas bearing from the refrigerant flowing inside the discharge cap assembly 1800.

[0321] In contrast, the diameter and / or size of the second bearing connecting hole H2 can correspond to the diameter of the first bearing connecting hole 125b.

[0322] In this case, compression and expansion that may occur during the supply of refrigerant flowing inside the discharge cap assembly 1800 to the gas bearing are prevented, thereby preventing pressure drop in the gas bearing and improving the efficiency of the gas bearing.

[0323] The first wall member 1815 is formed by separating the first cylindrical member 1811 from a predetermined interval D1. Therefore, a pulsation reduction space A1 for reducing the ejection pulsation is formed between the inner wall surface of the first wall member 1815 and the outer wall surface of the first cylindrical member 1811.

[0324] A first inflow hole H3 is formed in a portion of the outer wall of the first cylindrical member 1811 for reducing the pulsation of refrigerant flowing into the second discharge space 1040b through a plurality of first discharge holes H1. The first inflow hole H3 can be formed by bending a portion of the wall of the first cylindrical member 1811 toward the first column member 1817, and can be formed by extending axially.

[0325] Furthermore, a second discharge port H4 is formed on a portion of the first wall member 1815 for allowing refrigerant in the pulsation reduction space A1 to flow into the third discharge space 1040c. The second discharge port H4 can be formed by bending a portion of the wall surface of the first wall member 1815 toward the second discharge chamber 1830, and can extend axially.

[0326] Therefore, a portion of the refrigerant flowing into the second discharge space 1040b flows into the pulsation reduction space A1 through the first inlet hole H3, then flows into the third discharge space 1040c through the second discharge hole H4 to the outside of the first wall member 1815, and then flows through the second bearing connecting hole H2 and the first bearing connecting hole 125b in sequence, thereby lubricating the piston and cylinder.

[0327] A plurality of sixth reinforcing ribs R6 are formed on the outer wall surface of the first wall member 1815, protruding toward the second discharge chamber 1830 and extending axially. The plurality of sixth reinforcing ribs R6 can be located in the third discharge space 1040c between the outer surface of the first wall member 1815 in the first discharge chamber 1810 and the inner surface of the second cylindrical member 1831 in the second discharge chamber 1830, thereby reducing the discharge pulsation of refrigerant.

[0328] According to this configuration, the strength of the first wall member 1815 is increased by the sixth reinforcing rib R6, and the ejection pulsation is reduced.

[0329] The second ejection chamber 1830 can be shaped as an opening at the rear.

[0330] The second ejection chamber 1830 is combined with the first ejection chamber 1810 and is located in the inner space of the ejection cover 1850.

[0331] The second discharge chamber 1830 may be formed of a material having a different thermal conductivity than the material forming the discharge cover 1850 and / or the material forming the first discharge chamber 1810, but may be formed of polyamide 66 (PA66) in the same manner as the first discharge chamber 1810.

[0332] The second discharge chamber 1830 includes a second cylindrical member 1831 and a second bottom member 1833 supporting the second cylindrical member 1831.

[0333] A second discharge space 1040b is formed between the upper inner side of the second cylindrical member 1831 and the upper outer side of the first cylindrical member 1811. The second discharge space 1040b is interconnected with the first discharge space 1040a through the first discharge hole H1.

[0334] The second bottom member 1833 includes a third step portion 1833a, and a second cylindrical member 1831 is formed by protruding from the third step portion 1833a toward the ejector cap 1850.

[0335] The second cylindrical member 1831 includes a fourth step portion 1831a, a fifth step portion 1831b, and a sixth step portion 1831c. A protrusion 1837 is formed in the sixth step portion 1831c, which is inserted into the protrusion 1855 of the ejector cap 1850.

[0336] A plurality of seventh reinforcing ribs R7 may be formed on the inner wall of the second cylindrical member 1831, protruding from the inner wall of the second cylindrical member 1831 toward the second ejection space 1040b and extending axially.

[0337] According to this configuration, the strength of the wall of the second cylindrical member 1831 is increased by the plurality of seventh reinforcing ribs R7.

[0338] When the first discharge chamber 1810 and the second discharge chamber 1830 are combined, the sixth reinforcing rib R6 formed on the first wall member 1815 of the first discharge chamber 1810 is staggered from the seventh reinforcing rib R7 formed on the inner wall of the second cylindrical member 1831 of the second discharge chamber 1830.

[0339] For example, the seventh stiffener R7 can be positioned in the middle between two adjacent sixth stiffeners R6.

[0340] With the first discharge chamber 1810 and the second discharge chamber 1830 combined, a third discharge space 1040c is formed between the inner wall surfaces of the first wall member 1815 of the first discharge chamber 1810 and the second cylindrical member 1831 of the second discharge chamber 1830.

[0341] The third discharge space 1040c is formed to supply a portion of the refrigerant flowing within the discharge cap assembly 1800 to the piston and cylinder.

[0342] However, when the first discharge chamber 1810 and the second discharge chamber 1830 are combined, the sixth reinforcing rib R6 formed on the first wall member 1815 of the first discharge chamber 1810 and the seventh reinforcing rib R7 formed on the inner wall of the second cylindrical member 1831 of the second discharge chamber 1830 are staggered, thereby improving the pulsation reduction effect of the refrigerant flowing through the third discharge space 1040c to the third discharge hole H5.

[0343] A plurality of eighth reinforcing ribs R8 and at least one ninth reinforcing rib R9 are formed on the inner surface of the fourth step portion 1831a of the second cylindrical member 1831. The eighth reinforcing ribs R8 protrude toward the discharge valve assembly 170 and extend in a radial direction, and the ninth reinforcing rib R9 protrudes toward the discharge valve assembly 170 and is formed in a circumferential direction.

[0344] The eighth reinforcing rib R8 and the ninth reinforcing rib R9 can be connected to each other to form a single unit.

[0345] In addition, the eighth reinforcing rib R8 extends inward to form the inner side of the ninth reinforcing rib R9.

[0346] That is, the eighth reinforcing rib R8 has an extension that extends inward toward the inside of the ninth reinforcing rib R9.

[0347] Furthermore, the extension of the ninth reinforcing rib R9 is located in the region opposite to the region where the first discharge hole H1 is formed.

[0348] With this configuration, the extension of the eighth reinforcing rib R8 applies resistance to the refrigerant flowing into the second discharge space 1040b through the first discharge hole H1, thereby improving the pulsation reduction effect.

[0349] In particular, the extension of the eighth reinforcing rib R8 can improve the pulsation reduction effect of the refrigerant discharged to the outside through the third discharge port H5.

[0350] Furthermore, a second wall member 1835 is formed on the inner surface of the fourth step portion 1831a of the second cylindrical member 1831, which is inserted into the pulsation reduction space A1 formed between the first cylindrical member 1811 and the first wall member 1815 of the first discharge chamber 1810.

[0351] In order to serve as a reinforcing rib to strengthen the second cylindrical member 1831, the second wall member 1835 can be interconnected with a plurality of eighth reinforcing ribs R8 to form an integral unit.

[0352] A portion of the refrigerant can flow into the pulsation reduction space A1 through the first inlet hole H3. Therefore, the thickness T1 of the second wall member 1835 and the width of the pulsation reduction space A1, i.e., the interval D1 between the inner wall surface of the first wall member 1815 and the outer wall surface of the first cylindrical member 1811, can be formed to be the same. Therefore, the second wall member 1835 of the second discharge chamber 1830 can be in close contact with the outer wall surface of the first cylindrical member 1811 and the inner wall surface of the first wall member 1815, respectively.

[0353] However, the pulsation reduction space A1 needs to have space for a portion of the refrigerant in the second discharge space 1040b to flow to the third discharge space 1040c. Therefore, the depth D2 into which the second wall member 1835 is inserted into the pulsation reduction space A1 can be formed to be less than the depth D3 of the pulsation reduction space A1.

[0354] A third discharge port H5 is formed in the fifth step portion 1831b of the second cylindrical member 1831 for discharging the refrigerant flowing in the third discharge space 1040c to the outside, and an annular tube 115a is connected to the third discharge port H5.

[0355] In addition, an O-ring insertion groove 1833b for inserting an O-ring 1860 is formed on the outer surface of the second bottom member 1833. The O-ring 1860 is used to prevent refrigerant leakage while reducing the knocking sound of the discharge valve 171.

[0356] Therefore, the dispensing cap assembly 1800 can be manufactured by inserting the O-ring 1860 into the O-ring insertion groove 1833b of the second dispensing chamber 1830, in which the first dispensing chamber 1810 is pressed, and then pressing the second dispensing chamber 1830 into the dispensing cap 1850.

[0357] The O-ring 1860 prevents refrigerant flowing inside the discharge cap assembly 1800 from leaking to the outside through the space between the discharge cap 1850 and the second discharge chamber 1830, while effectively reducing the knocking noise of the discharge valve 171, which is the main noise source of the linear compressor.

[0358] The ejector cap 1850 can be shaped to have a rear opening. The ejector cap 1850 can be combined with the frame 120. The back of the ejector cap 1850 can be combined with the front of the first flange 122 of the frame 120.

[0359] The ejector cap 1850 may include a third cylindrical member 1851 and a third bottom member 1853 supporting the third cylindrical member 1851.

[0360] The third bottom member 1853 may include a seventh step portion 1853a, and the third cylindrical member 1851 may be formed by protruding from the seventh step portion 1853a in the axially forward direction.

[0361] With the second discharge chamber 1830 pressed in, the seventh step portion 1853a of the third bottom member 1853 can be in close contact with the outer surface of the second bottom member 1833 of the second discharge chamber 1830.

[0362] In order to make the seventh step portion 1853a of the third bottom member 1853 and the second bottom member 1833 of the second discharge chamber 1830 fit tightly against each other, the depth D4 of the seventh step portion 1853a and the thickness T2 of the second bottom member 1833 can be formed to be the same.

[0363] Therefore, it is possible to prevent the refrigerant flowing inside the discharge cap assembly 1800 from leaking to the outside through the space between the discharge cap 1850 and the second discharge chamber 1830.

[0364] With the second discharge chamber 1830 pressed in, the outer wall of the second discharge chamber 1830 and the inner wall of the discharge cover 1850 can be positioned separately from each other to form an insulated space A2.

[0365] In particular, the outer wall of the second cylindrical member 1831 of the second discharge chamber 1830 and the inner wall of the third cylindrical member 1851 of the discharge cover 1850 can be located in a spaced-apart position to form an insulated space A2.

[0366] With this configuration, the heat from the discharged refrigerant can be more effectively suppressed from being transferred to the frame 120 through the discharge cap assembly 1800.

[0367] The back of the third bottom member 1853 of the ejector cap 1850 can be engaged with the front of the first flange 122 of the frame 120.

[0368] In this case, the ejector cap 1850 can be attached to the front of the frame 120 by attaching mechanical connecting components such as bolts to the connecting hole 1853b formed in the third bottom member 1853 and the fixing groove of the first flange portion 122.

[0369] The third cylindrical member 1851 may include an eighth step portion 1851a, a ninth step portion 1851b, and a tenth step portion 1851c.

[0370] The discharge cap 1850 may include a protrusion 1855 that protrudes axially forward from the ninth step portion 1851b and the tenth step portion 1851c of the third cylindrical member 1851. The protrusion 1855 may be formed in the central region of the third cylindrical member 1851.

[0371] A protrusion 1837 of a second dispensing chamber 1830 can be provided in the protrusion 1855. This improves the space efficiency within the dispensing cover 1850.

[0372] In the ninth step portion 1851b and the tenth step portion 1851c of the third cylindrical member 1851, a tube insertion hole H6 for inserting an annular tube 115a can be formed.

[0373] Therefore, one end of the annular tube 115a inserted into the tube insertion hole H6 can be connected to the third discharge hole H5 of the fifth step portion 1831b of the second cylindrical member 1831 formed in the second discharge chamber 1830.

[0374] The 1850 ejector cap can be made of aluminum alloy.

[0375] Reference Figure 11 It can be confirmed that the noise measured at the rear of a refrigerator with a linear compressor according to an embodiment of the present invention is improved in the high-frequency (2.5kHz) band compared with the noise measured at the rear of a refrigerator with a linear compressor according to Patent Document 1.

[0376] In addition, refer to Figure 12 It can be confirmed that, compared with the pulsation component of the refrigerator with the linear compressor of an embodiment of the present invention, the pulsation component of the refrigerator is improved in the high-frequency (2.5kHz) band.

[0377] The embodiments of the present invention described above, or other embodiments thereof, are not mutually exclusive or distinct from each other. The embodiments of the present invention described above, or other embodiments thereof, can be used together or combined in their respective configurations or functions.

[0378] For example, this means that configuration A illustrated in a particular embodiment and / or drawing can be combined with configuration B illustrated in other embodiments and / or drawings. That is, even if the combination between configurations is not directly described, it is implied that they can be combined unless explicitly stated that they cannot be combined.

[0379] Therefore, the detailed description above should not be construed as limiting in all respects, but rather as exemplary. The scope of protection of this invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of this invention fall within the scope of this invention.

Claims

1. A linear compressor, wherein, include: frame; The cylinder barrel is disposed within the frame; The piston, disposed within the cylinder, reciprocates axially. A discharge valve is positioned in front of the piston; as well as The ejector cap assembly, combined with the frame, is positioned in front of the piston. The ejector cap assembly includes: The lid has an internal space. A first dispensing chamber is disposed within the internal space of the dispensing cover, forming a first dispensing space within the first dispensing chamber; and The second discharge chamber is disposed between the first discharge chamber and the discharge cover, forming a second discharge space communicating with the first discharge space and a third discharge space communicating with the second discharge space between the second discharge chamber and the first discharge chamber. The first discharge chamber includes: The first cylindrical component forms the first discharge space into which refrigerant discharged through the discharge valve flows; The first bottom component supports the first cylindrical component; The first column member protrudes rearward from the center of the first cylindrical member toward the discharge valve and has a predetermined depth; and The first wall component is ring-shaped, protrudes from the first bottom component, and surrounds the first cylindrical component. A plurality of first discharge holes are formed on the bottom surface of the first column member for discharging the refrigerant flowing in through the discharge valve into the second discharge space of the second discharge chamber. The plurality of first discharge holes are formed through the bottom surface of the first column member. A portion of the first bottom member has a second bearing communication hole that communicates with both a first bearing communication hole formed in the frame and the third ejection space. A portion of the refrigerant in the third discharge space flows through the second bearing connection hole to the first bearing connection hole and lubricates the cylinder and the piston.

2. The linear compressor according to claim 1, wherein, The first and second discharge chambers are formed of a material having a different thermal conductivity than the material forming the discharge cover. At least one of the first discharge chamber and the second discharge chamber is formed of polyamide resin.

3. The linear compressor according to claim 1 or 2, wherein, The first wall member is formed at a predetermined interval from the first cylindrical member. A pulsation reduction space is formed between the inner wall surface of the first wall member and the outer wall surface of the first cylindrical member to reduce the refrigerant discharge pulsation. A first inlet hole is formed in a portion of the outer wall surface of the first cylindrical member to allow refrigerant in the second discharge space to flow into the pulsation reduction space. A second discharge port is formed in a portion of the first wall member to allow refrigerant in the pulsation-reducing space to flow into the third discharge space.

4. The linear compressor according to claim 3, wherein, The second ejection chamber includes a second wall member inserted into the pulsation reduction space of the first ejection chamber. The thickness of the second wall member is formed to be the same as the width of the pulsation reduction space. The second wall member is inserted into the pulsation reduction space to a depth less than the depth of the pulsation reduction space.

5. The linear compressor according to claim 3, wherein, The first ejection chamber includes at least two types of reinforcing ribs selected from a plurality of first reinforcing ribs, second reinforcing ribs, a plurality of third reinforcing ribs, fourth reinforcing ribs, a plurality of fifth reinforcing ribs, and a plurality of sixth reinforcing ribs. A plurality of the first reinforcing ribs protrude from the inner sidewall of the first cylindrical member toward the first discharge space and extend axially to form the first reinforcing ribs. The second reinforcing rib protrudes from the inner side of the upper surface of the first cylindrical component toward the first ejection space side and is in a ring shape. A plurality of the third reinforcing ribs protrude from the inner sidewall of the first column member toward the first ejection space and extend axially to form the third reinforcing ribs. The fourth reinforcing rib is located on the outer wall of the first column member and spatially divides it into a plurality of the first ejection holes. A plurality of the fifth reinforcing ribs protrude from the inner sidewall of the first bottom component toward the first ejection space side. A plurality of the sixth reinforcing ribs protrude from the outer side of the first wall member toward the second discharge chamber and extend axially to form the sixth reinforcing ribs.

6. The linear compressor according to claim 5, wherein, The second discharge chamber includes a second cylindrical member and a second bottom member supporting the second cylindrical member. The first ejection chamber includes a plurality of the aforementioned sixth reinforcing ribs. The second discharge chamber further includes a plurality of seventh reinforcing ribs that protrude axially from the inner wall of the second cylindrical member toward the third discharge space. The plurality of sixth reinforcing ribs and the plurality of seventh reinforcing ribs are located in the third discharge space formed between the outer surface of the first wall member and the inner surface of the second cylindrical member to reduce refrigerant discharge pulsation.

7. The linear compressor according to claim 6, wherein, With the first ejection chamber and the second ejection chamber combined, the plurality of the sixth reinforcing ribs and the plurality of the seventh reinforcing ribs are staggered.

8. The linear compressor according to claim 7, wherein, A plurality of eighth reinforcing ribs protruding toward the discharge valve and extending radially are formed on the inner surface of the second cylindrical member, and at least one ninth reinforcing rib protruding toward the discharge valve and forming in the circumferential direction. The eighth reinforcing rib and the ninth reinforcing rib are connected to each other to form a whole.

9. The linear compressor according to claim 6, wherein, An O-ring insertion groove for inserting an O-ring is formed on the outer surface of the second bottom component. The O-ring inserted into the O-ring insertion slot is located between the second bottom member and the ejector cap. The inner wall of the third cylindrical member of the discharge cap and the outer wall of the second cylindrical member are located apart from each other to form an insulating space between them.

Images