Scroll compressor

Abstract

A scroll compressor is disclosed. According to an embodiment of the present invention, a discharge check valve is installed in a rear housing of a scroll compressor to separate oil included in a refrigerant and to minimize generation of vibration noise due to pulsation, thereby allowing stable operation regardless of fluctuations in pressure of the refrigerant.

Description

Technical Field

[0001] Preferred embodiments relate to separation of oil contained in refrigerant discharged from a compressor and reduction of noise caused by pulsation, and more particularly, to a scroll compressor having improved efficiency in reducing pulsation noise caused by pressure of the discharged refrigerant. Background Art

[0002] Generally, the cooling system in a vehicle includes a compressor, a condenser, an expansion valve, and an evaporator, wherein the compressor compresses the refrigerant gas discharged from the evaporator into a high temperature, high pressure state to make it easier to liquefy and then delivers it to the condenser. In addition, the compressor pumps the refrigerant to ensure continuous cooling by recirculating the refrigerant.

[0003] The condenser cools and liquefies the high-temperature, high-pressure refrigerant gas through heat exchange with the outside air, while the expansion valve reduces the temperature and pressure of the liquid refrigerant through adiabatic expansion, making it easier for the liquid refrigerant to evaporate in the evaporator.

[0004] The evaporator absorbs heat by exchanging heat between liquid refrigerant and outside air introduced into the interior, causing the refrigerant to evaporate and vaporize. The outside air, which loses heat to the refrigerant and is thus cooled, is blown into the interior of the vehicle by the blower.

[0005] Compressors are classified into reciprocating type and rotary type according to whether the working fluid (refrigerant) is compressed by reciprocating motion or rotational motion, and the reciprocating type is further divided into a crank type that uses a crank to transmit the driving force of a power source to multiple pistons, an inclined plate type that transmits the driving force to a rotating shaft with a plate installed, and a swing plate type that uses a swing plate.

[0006] For example, a scroll compressor is a type of rotary compressor using two interleaved scrolls with involute engagement profiles that perform compression through an orbiting motion.

[0007] A scroll compressor operates by the relative rotation of an orbiting scroll and a non-orbiting scroll within a discharge chamber, wherein the two scrolls have wraps shaped to resemble the same involute curve, geometrically 180 degrees out of phase.

[0008] The scroll compressor forms a crescent-shaped compression chamber by interlacing the orbiting scroll and the fixed scroll, thereby completing the compression cycle. The compression chamber is formed in a shape in which the volume increases toward the outer edge and decreases toward the center, wherein a suction chamber is formed on the outer side and a discharge port is formed at the center.

[0009] In the scroll compressor, compression occurs when suction gas sealed within a given volume at the outer periphery of the scroll is gradually compressed toward a discharge port due to relative rotation of the scroll and is discharged through the discharge port.

[0010] The refrigerant discharged from the discharge chamber undergoes centrifugal separation via the oil separation tube and is then finally discharged through the discharge port; however, if oil remains in the discharged refrigerant, the oil reduces evaporation efficiency of the refrigerant in the evaporator, thereby affecting the efficiency of the compressor.

[0011] The scroll compressor includes a discharge passage that guides compressed refrigerant to be discharged from a discharge chamber to the outside of the compressor, and the discharge passage is equipped with a discharge check valve (DCV) that adjusts an opening degree of the discharge passage.

[0012] The discharge check valve in the scroll compressor facilitates the discharge of compressed refrigerant from a discharge chamber of the compressor to the outside, reduces pulsation of the discharged refrigerant, and is designed to prevent the refrigerant from flowing from the outside of the scroll compressor back into the discharge chamber.

[0013] Recently, additional components for performance enhancement, such as steam injection, have been installed in the rear housing of the scroll compressor, thereby occupying a certain amount of space. Installing the additional components in the rear housing of the scroll compressor reduces capacity, increases vibration and noise caused by pulsation during high-pressure refrigerant discharge, and causes oil separation efficiency to fluctuate, requiring countermeasures. Summary of the invention

[0014] Technical issues

[0015] The preferred embodiment is directed to providing a scroll compressor capable of ensuring stable operation by incorporating an oil separation function in a rear head and reducing pressure fluctuation caused by pulsation of a refrigerant.

[0016] Technical Solution

[0017] A scroll compressor according to an embodiment of the present invention includes: a compression unit connected to one side of a driving unit; a rear shell including a discharge chamber through which the refrigerant compressed in the compression unit is discharged and a passage forming a flow path for the refrigerant to be discharged; and a discharge check valve installed in the passage to supply refrigerant to the discharge port by changing the opening based on the pressure of the refrigerant, wherein the discharge check valve includes: a main body connected to the passage and including a main inlet port through which the refrigerant and oil are introduced; a core unit configured to move inside the main body based on the pressure of the refrigerant; and a variable inner diameter flow path formed by an inner diameter of the main body that changes in an axial direction.

[0018] The scroll compressor also includes an inlet hole connected to the discharge chamber, through which refrigerant is introduced, and the refrigerant moving through the inlet hole collides with the discharge check valve, thereby causing some oil to separate.

[0019] The scroll compressor further includes an elastic member configured to support the core unit.

[0020] The main inlet port includes: a first main inlet portion, which is temporarily maintained in a closed state by the core unit before the core unit moves to the upper part of the main body; and a second main inlet portion, which is arranged symmetrically with respect to an imaginary line drawn based on the first main inlet portion and remains continuously open.

[0021] The second main inlet portion is arranged bilaterally symmetrically with respect to the first main inlet portion.

[0022] The inner diameter variable flow path includes an expansion section in which an opening cross-sectional area increases as a pressure difference based on movement of the core unit increases.

[0023] The expansion section starts from the second main inlet portion and expands over a predetermined section.

[0024] The inner diameter variable flow path is formed to be inclined outwardly toward the radial direction from the bottom to the top of the body.

[0025] The variable inner diameter flow path is connected to the second main inlet portion.

[0026] The variable inner diameter flow path is arranged inside the body symmetrically with respect to an imaginary center line along the axis of the body.

[0027] The body has a cover coupled to an upper end portion thereof, and the cover includes a cover opening formed on an upper surface along a circumferential direction to allow refrigerant passing through the core unit to move to the discharge port.

[0028] The cover is formed with an outer diameter larger than that of the body, and is coupled to the passage.

[0029] The cover includes a rib formed at the center of an upper surface and a bridge formed to partition between the cover openings based on the rib.

[0030] The bridge portion at least partially overlaps the inner diameter variable flow path in the axial direction.

[0031] The core unit includes: a first core portion, which extends axially with an outer diameter corresponding to the inner diameter of the main body and has a core rib portion formed on the outer surface of the first core portion; a second core portion, which is integrally formed with the first core portion and extends from the top of the first core portion for discharging refrigerant; and a third core portion, which is integrally formed with the first core portion and extends from the bottom of the first core portion for introducing refrigerant, and has a diameter different from that of the first core portion.

[0032] The core unit is positioned by aligning the bottom surface of the third core portion with the bottom surface of the body before being actuated by the refrigerant.

[0033] The body includes core guide parts positioned to face each other inside the body to guide movement of the core unit.

[0034] The core guide portion includes a first core guide piece into which the core rib portion is inserted.

[0035] The core guide portion includes a second core guide formed adjacent to the guide groove on the core guide portion and partially in contact with the outer surface of the core unit to facilitate axial movement of the body.

[0036] The second core guide maintains a curvature corresponding to an outer curvature of the core unit.

[0037] The core guide portion is arranged to intersect the inner diameter variable flow path.

[0038] The core guide portion includes: a first opening wall, which is inclined in a direction in which the opening area of ​​the inner diameter variable flow path increases; and a second opening wall, which extends a predetermined length from an extended end of the first opening wall toward the axial upper side and maintains a constant opening cross-sectional area.

[0039] Beneficial Effects

[0040] The preferred embodiment is advantageous in improving the flow of refrigerant gas by installing a discharge check valve with an oil separation function in the passage into which the refrigerant discharged from the compression section flows, and modifying the structure so that the refrigerant gas can still flow through the discharge check valve even when the scroll compressor is not operating.

[0041] The preferred embodiment is advantageous in improving the controllability of the scroll compressor and minimizing vibration caused by pulsation by modifying the structure so that the discharge check valve allows the refrigerant gas to flow even in the absence of a pressure difference.

[0042] The preferred embodiment is advantageous in minimizing vibration and noise caused by pulsation and improving oil separation efficiency by effectively separating oil contained in the refrigerant through the discharge check valve, guiding the flow of the refrigerant, and allowing only the separated refrigerant gas to move to the discharge port.

[0043] Embodiments of the present invention are advantageous in improving operational safety of a scroll compressor by stably controlling the amount of refrigerant gas discharged through a discharge port so that a core unit installed in a discharge check valve adjusts a movement stroke within a body according to refrigerant pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1is a perspective view illustrating a discharge check valve installed in a rear housing according to a preferred embodiment;

[0045] Figure 2 is an exploded perspective view of a discharge check valve according to a preferred embodiment;

[0046] Figure 3 yes Figure 2 A cross-sectional view of the assembled state;

[0047] Figure 4 is a bottom perspective view of a discharge check valve according to a preferred embodiment;

[0048] Figure 5 and Figure 6 is a diagram illustrating an inner diameter variable flow path and a core guide portion formed in a body according to a preferred embodiment;

[0049] Figure 7 and Figure 8 is a perspective view illustrating a state in which a core portion is coupled to a body according to a preferred embodiment;

[0050] Fig. 9 is a diagram illustrating a state in which a cover is coupled to a main body according to a preferred embodiment;

[0051] Fig.10 is a diagram illustrating a state before the discharge check valve operates according to a preferred embodiment;

[0052] Fig.11 is a diagram illustrating a state when a discharge check valve operates according to a preferred embodiment; and

[0053] Fig.12 is a diagram illustrating a scroll compressor equipped with a discharge check valve according to a preferred embodiment. DETAILED DESCRIPTION

[0054] The advantages and features of the present disclosure and the methods of achieving these advantages and features can be more easily understood by referring to the detailed description of the embodiments which will be described below with reference to the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein; on the contrary, these exemplary embodiments are provided so that the present disclosure will be thorough and complete and will fully convey the concept of the present invention to those skilled in the art, and the present disclosure will be limited only by the appended claims. Throughout the specification, the same reference numerals refer to the same components.

[0055] When a component is described as being “connected to” or “coupled to” another component, it may refer to a direct connection or coupling with the other component or to a case where another component is interposed between the two components. Meanwhile, when a component is referred to as being “directly connected to” or “directly coupled to” another component, it indicates that no other component is interposed between the two components. The expression “and / or” is deemed to include each of the items mentioned and any combination of one or more items.

[0056] The terms used in this specification are for the purpose of describing the embodiments and are not intended to limit the present disclosure. In this specification, unless otherwise specified in a phrase, the singular includes the plural. The "include" and / or "comprising" used in the specification do not exclude the existence or addition of one or more other components, steps, operations and / or devices mentioned.

[0057] Although the terms "first", "second", etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from other components.

[0058] A scroll compressor according to an embodiment of the present invention will be described with reference to the accompanying drawings. Figure 1 is a perspective view illustrating a discharge check valve installed in a rear housing according to a preferred embodiment, Figure 2 is an exploded perspective view of a discharge check valve according to a preferred embodiment, Figure 3 yes Figure 2 Cross-sectional view of the assembled state, Figure 4 is a bottom perspective view of a discharge check valve according to a preferred embodiment, Figure 5 and Figure 6 is a diagram illustrating an inner diameter variable flow path and a core guide portion formed in a body according to a preferred embodiment, and Figure 7 and Figure 8 is a perspective view illustrating a state in which a core portion is coupled to a body according to a preferred embodiment.

[0059] Fig. 9 is a diagram illustrating a state in which a cover is coupled to a main body according to a preferred embodiment, Fig.10 is a diagram illustrating a state before the discharge check valve operates according to a preferred embodiment, Fig.11 is a diagram illustrating a state when a discharge check valve operates according to a preferred embodiment, and Fig.12 is a diagram illustrating a scroll compressor equipped with a discharge check valve according to a preferred embodiment.

[0060] Reference Figures 1 to 12, the scroll compressor 1 according to the preferred embodiment includes a discharge check valve 100 installed in the passage 14 of the rear housing 10 to stably separate oil and refrigerant gas and reduce vibration and noise caused by pulsation.

[0061] To achieve this, the embodiment includes: a drive unit 3; a compression unit 5, which is connected to one side of the drive unit 3; a control unit 7, which is connected to the other side of the drive unit 3; a rear shell 10, which has a passage 14 connected to an inlet hole 12, and the refrigerant flows in through the inlet hole 12; and a discharge check valve 100, which is installed in the passage 14 to guide the oil contained in the refrigerant moving through the inlet hole 12 in the direction of gravity while changing the opening according to the pulsation of the refrigerant, so as to supply only the gaseous refrigerant to the discharge port 11.

[0062] The scroll compressor 1 includes a drive unit 3 equipped with a stator 90 inside thereof, and the drive unit 3 corresponds to a power source that generates a rotational power for the scroll compressor 1 to compress a refrigerant. The drive unit 3 includes a drive unit housing 30 forming an exterior, a stator 90 fixed inside the drive unit housing 30, and a rotor 41 rotating inside the stator 90.

[0063] The drive unit housing 30 forming the outer body of the drive unit 3 is cylindrical in shape, and includes a front housing 32 supporting a front end portion of the rotor 41 and a rear housing 31 supporting a rear end portion of the rotor 41 .

[0064] The stator 90 that generates a rotational driving force together with the rotor 41 mounted coaxially is an electromagnet including a stator core fixedly mounted on the inner periphery of the drive unit case 30 by press fitting or the like and a stator coil 92 wound on the stator core.

[0065] The stator core is a hollow cylindrical member having a through hole along the central axis, and the rotor 41 is inserted into the through hole.

[0066] The rotor 41 coaxially mounted inside the stator 90 is rotated and driven in a state of being rotatably inserted into a through hole at the center of the stator core.

[0067] The rotor 41 has a rotating shaft 37 inserted along a central axis, wherein a rotor core 39 is attached to the outer periphery of the rotating shaft 37. When the stator 90 is energized, the rotor 41 rotates and is driven by interaction with the stator 90 according to the operating principle of the motor, and the rotating shaft 37 is supported via bearings 81 and 82 for rotation within the drive unit housing 30.

[0068] The compression unit 5 driven by the rotational driving force generated from the driving unit 3 rotates to compress the refrigerant, and includes a movable scroll 53 and a fixed scroll rotatably engaged with the movable scroll 53 to compress the refrigerant and discharge the compressed refrigerant to the outside of the compressor 1 .

[0069] The compression unit 5 is configured as a cylindrical structure that is open toward the drive unit 3 and has an open discharge port 11 on one side through which the compressed gaseous refrigerant is discharged.

[0070] The movable scroll 53 is formed with a spirally curved movable scroll wrap 59 which protrudes at the rear to converge toward the center, and the eccentric axis 38 of the rotating shaft 37 of the drive unit 3 is connected to the center of the rotating scroll wrap 59, thereby allowing the movable scroll 53 to revolve synchronously with the rotor 41 around the center of the rotating shaft 37.

[0071] The fixed scroll 50 is arranged to form a compression chamber 54 between the fixed scroll 50 and the movable scroll 53 , and includes a spirally curved fixed scroll wrap 61 arranged to converge toward the center and mesh with the movable scroll wrap 59 .

[0072] Therefore, when the movable scroll 53 rotates, the movable scroll 53 and the fixed scroll 50 that are engaged with each other interact with each other through their corresponding movable scroll rolls 59 and fixed scroll rolls 61, thereby compressing the refrigerant sucked from the drive unit 3 toward the periphery of the movable scroll roll 59 and the fixed scroll roll 61, and then discharging the compressed refrigerant through the discharge port 62 to the rear shell 10 under high pressure.

[0073] The rear housing 10 is formed with a passage 14 connected to an inlet hole 12 through which the refrigerant flows in.

[0074] The scroll compressor 1 includes: a rear housing 10 including a discharge chamber 10a through which the refrigerant compressed in the compression unit 5 connected to one side of the drive unit 3 is discharged, and a passage 14 connected to the discharge chamber 10a and an inlet hole 12 through which the refrigerant flows; and a discharge check valve 100 installed in the passage 14 to supply refrigerant to the discharge port 11 by changing the opening based on the pressure of the refrigerant moving through the inlet hole 12.

[0075] The discharge check valve 100 includes a body 110 coupled to the passage 14 and characterized by a main inlet port 111 (see Figures 5 to 7 ) and a variable inner diameter flow path 112 formed in the body 110 to change in the axial direction (see Figure 5); a core unit 120, the core unit 120 moves inside the body 110 in response to the refrigerant pressure; and an elastic member 130, the elastic member 130 for supporting the core unit 120.

[0076] The discharge check valve 100 is equipped to separate oil from refrigerant, control the stroke based on pulsation and guide only the refrigerant gas to the discharge port 11; in particular, in this embodiment, the main inlet port 111 formed in the main body 110 is configured to remain partially open, thereby allowing some entry of refrigerant or oil instead of maintaining a closed state, thereby preventing the flutter phenomenon of the discharge check valve 100 caused by pulsation during the initial conversion of the scroll compressor 1 from a closed state to an open state and suppressing the generation of unnecessary vibrations.

[0077] Additionally, in this embodiment, control of the scroll compressor 1 is optimized by configuring the discharge check valve 100 to be in a partially open state, thereby enhancing control in response to fluctuations in refrigerant pressure.

[0078] The refrigerant collides with the discharge check valve 100 after moving through the inlet hole 12, thereby causing the oil contained in the refrigerant to be separated, and the oil is discharged to the bottom of the rear shell 10, while the refrigerant gas can stably move toward the upper part of the rear shell 10 through the discharge check valve 100, thereby enhancing the oil separation efficiency.

[0079] The passage 14 is formed with an inner surface in a cylindrical shape and is arranged diagonally with respect to the rear housing 10, thereby allowing the refrigerant to flow in through the inlet hole 12. The refrigerant rotates in a spiral shape along a longitudinal lower side after entering the passage 14 and moves in a circumferential direction.

[0080] Here, the heavier oil is discharged to the bottom of the passage 14, while the relatively lighter refrigerant gas moves upward and is supplied to the evaporator. The discharge check valve 100 allows the refrigerant gas including the oil contained in the refrigerant introduced through the inlet hole 12 to enter through the second main inlet portion 111b to be described later, thereby facilitating the movement of the refrigerant gas even under the condition of a malfunction of the core unit 120.

[0081] In this embodiment, the inlet port 12 is configured to communicate with the discharge chamber 10 a and allow the refrigerant to enter, and the refrigerant flowing through the inlet port 12 collides with the discharge check valve 100 , thereby causing some oil separation.

[0082] The body 110 is generally cylindrical in shape, with a main inlet port 111 formed on the bottom and an inner diameter variable flow path 112 formed inside.

[0083] The main inlet port 111 includes a first main inlet portion 111 a temporarily maintained in a closed state by the core unit 120 before the core unit 120 moves to the upper portion of the body 110 and a second main inlet portion 111 b arranged symmetrically with respect to an imaginary line drawn based on the first main inlet portion 111 a .

[0084] The second main inlet portion 111 b always remains open to allow the refrigerant gas to pass therethrough, and when the core unit 120 moves, movement of the refrigerant gas may occur through both the first main inlet portion 111 a and the second main inlet portion 111 b .

[0085] The second main inlet portion 111 b is symmetrically arranged with respect to the first main inlet portion 111 a , thereby allowing stable entry of refrigerant regardless of the direction in which the refrigerant enters.

[0086] The first main inlet portion 111 a remains closed before the core unit 120 moves, and when the core unit 120 moves, the first main inlet portion 111 a opens to allow movement of the refrigerant gas.

[0087] In this embodiment, refrigerant gas may flow through the second main inlet portion 111b even when the core unit 120 does not move, thereby preventing vibration of the discharge check valve 100 due to pulsation during initial operation after the scroll compressor 1 stops, which reduces noise generation.

[0088] The inner diameter variable flow path 112 includes an expansion section in which the opening cross-sectional area increases as the pressure difference due to the movement of the core unit 120 increases. The expansion section extends from the lower portion forming the main inlet port 111 along the axis of the body 110 to the bottom of the cover 140 to be described later. The expansion section is designed to reduce the refrigerant pressure, and the form shown in the figure is one example among various embodiments.

[0089] The expansion section starts from the second main inlet portion 111 b and expands over a predetermined section.

[0090] The inner diameter variable flow path 112 is formed with a tapered shape that is inclined outward in the radial direction from the bottom to the top of the body 110. When such an inner diameter variable flow path 112 is formed, vibration caused by pulsation due to pressure fluctuation of the refrigerant can be reduced compared to maintaining a constant diameter, thereby reducing vibration generation.

[0091] The inner diameter variable flow path 112 extends axially from the bottom end of the body 110 toward the top by a predetermined length, thereby increasing the diameter toward the upper portion of the body 110 to increase the opening area for the movement of the refrigerant gas. This allows a stable flow even when a large amount of refrigerant gas is introduced into the discharge check valve 100.

[0092] When the inner diameter variable flow path 112 exists, an opening area for the refrigerant flow increases when the core unit 120 moves within the body 110, thereby preventing vibration from being generated due to pulsation.

[0093] The inner diameter variable flow path 112 is connected to the second main inlet portion 111 b , thereby allowing the refrigerant to flow into and move through the inner diameter variable flow path 112 .

[0094] The inner diameter variable flow path 112 is symmetrically arranged inside the body 110 with respect to an imaginary center line along the axis, thereby providing a space to reduce vibration and noise caused by pressure fluctuations while allowing the refrigerant entering through the main inlet port 111 to stably move in any direction.

[0095] The refrigerant remains in a mixed gas state containing oil and gas before passing through the inlet hole 12. As indicated by the thick solid line, the refrigerant moves downward through the passage 14 due to the weight of the oil, and then proceeds to the filter section.

[0096] As depicted by the dotted line, refrigerant gas within the refrigerant entering through the lower portion of the passage 14 via the second main inlet portion 111 b rises toward the discharge port 11 due to a difference in weight, thereby allowing stable separation of oil contained in the refrigerant and the refrigerant gas.

[0097] The cover 140 is attached to the upper end portion of the body 110 , and has a cover opening 142 formed on an upper surface along a circumferential direction to allow the refrigerant passing through the core unit 120 to move to the discharge port 11 .

[0098] According to this embodiment, the cover 140 is coupled to the upper end portion of the body 110 , and a cover opening 142 is formed along the circumferential direction to allow the refrigerant passing through the core unit 120 to move to the discharge port 11 .

[0099] The cover openings 142 are provided in a plural number in the circumferential direction centered on the center of the cover 140 to allow the refrigerant in a gas state to move toward the discharge port 11 without resistance or pressure loss.

[0100] The reason for disposing the cover opening 142 in this manner is to ensure stable refrigerant movement by preventing the core unit 120 from partially blocking or overlapping the cover opening 142 even when moving toward the lower portion of the cover 140 relative to compression of the elastic member 130 .

[0101] The cover 140 includes a rib 144 formed at the center of the upper surface and a bridge 146 formed to partition between the cover openings 142 based on the rib 144. The rib 144 and the bridge 146 are integrally formed, thereby allowing the rib 144 to stably support the load applied by the elastic member 130, thereby uniformly maintaining the strength of the cover 140.

[0102] The bridge portion 146 partitions the plurality of cover openings 142 to guide the refrigerant gas between the plurality of cover openings 142 , thereby preventing the refrigerant gas from being concentrated in a specific area and enabling the refrigerant gas to stably move while dispersing part of the generated vibration outward in the radial direction.

[0103] Since the bridge portion 146 at least partially overlaps the inner diameter variable flow path 112 in the axial direction, the refrigerant collides with the bridge portion 146 to enhance the oil separation performance.

[0104] The core unit 120 according to the present embodiment includes: a first core portion 122, which extends axially with an outer diameter corresponding to the inner diameter of the main body 110 and has a core rib portion 122a formed on the outer surface of the first core portion 122; a second core portion 124, which is integrally formed with the first core portion 122 and extends from the top of the first core portion 122 for discharging refrigerant; and a third core portion 126, which is integrally formed with the first core portion 122 and extends from the bottom of the first core portion 122 for introducing refrigerant, and has a diameter different from that of the first core portion 122.

[0105] The core unit 120 extends axially, wherein the second core section 124 extends upward from the first core section 122 , and the third core section 126 extends downward from the first core section 122 .

[0106] The first core portion 122 is cylindrical in shape, and the core ribs 122a are symmetrically arranged on the left and right sides when viewed from the top of the core unit 120. The core ribs 122a are formed in a cylindrical shape as an example, but may be formed in other shapes.

[0107] The second to third core sections 124 to 126 are formed with a smaller diameter than the first core section 122 , which reduces weight and manufacturing cost, thereby improving cost effectiveness.

[0108] Before being actuated by the refrigerant, the core unit 120 is positioned with the bottom surface of the third core portion 126 aligned with the bottom surface of the body 110. In this configuration, the first main inlet portion 111a remains closed, and the refrigerant gas enters only through the second main inlet portion 111b as indicated by the arrow, and then travels through the interior of the body 110 and upward to the top of the cover 140.

[0109] In order to guide the movement of the core unit 120 , the body 110 is provided with core guide parts 114 positioned to face each other on the inside of the body 110 .

[0110] The core guide portions 114 are arranged bilaterally symmetrically when viewed from the top of the body 110 , thereby ensuring stable movement of the core unit 120 .

[0111] The core unit 120 according to the present embodiment constantly moves inside the body 110 in a stable manner without rotating in the axial direction due to the core guide part 114 .

[0112] The core guide portion 114 includes a first core guide 114a into which the core rib 122a is inserted. The first core guide 114a is formed with a rounded groove inwardly to accommodate the insertion of the core rib 122a.

[0113] When the core unit 120 is guided by the first core guide 114a, the movement of the core unit 120 is maintained uniformly, thereby preventing any rotational movement during the movement.

[0114] The second core guide 114 b is formed adjacent to the first core guide 114 a on the core guide portion 114 and partially contacts the outer surface of the core unit 120 to facilitate the axial movement of the body 110 .

[0115] The second core guide 114 b maintains a curvature corresponding to the outer curvature of the core unit 120 and minimizes friction when in contact with the outer surface of the core unit 120 , thereby ensuring stable movement of the core unit 120 .

[0116] The second core guide 114 b does not contact the entire outer surface of the core unit 120 , but guides the movement of the core unit 120 by contacting the core unit 120 in certain sections based on the first core guide 114 a .

[0117] The core guide portion 114 according to the present embodiment is arranged to intersect with the inner diameter variable flow path 112. The position where the inner diameter variable flow path 112 is formed is connected to the second main inlet portion 111b, and when the inner diameter variable flow path 112 is arranged to overlap with this position, the movement of the refrigerant gas is hindered, thereby requiring the intersection arrangement as shown in the figure.

[0118] The core guide portion 114 is arranged to intersect the inner diameter variable flow path.

[0119] The core guide portion 114 includes: a first opening wall 114c, which is inclined in the direction of increasing the opening area of ​​the inner diameter variable flow path 112; and a second opening wall 114d, which extends a predetermined length from the extended end of the first opening wall 114c toward the axial upper side and maintains a constant opening cross-sectional area.

[0120] The first opening wall 114 c is inclined at a predetermined angle as shown in the drawings, thereby extending to guide the refrigerant along the first opening wall 114 c toward the second opening wall 114 d .

[0121] The second opening wall 114d vertically extends toward the cover 140 as shown in the drawings, thereby ensuring vertical movement of the refrigerant guided through the first opening wall 114c.

[0122] The core unit 120 is maintained in a supported state under a predetermined pressure applied by an elastic member 130 to be described later, and when a pressure exceeding the supporting force of the elastic member 130 is applied to the core unit 120, the core rib portion 122a slides axially along the inner surface of the first core guide 114a while being guided along the movement direction, thereby adjusting the stroke in different ways.

[0123] In particular, the core rib 122a moves along the axial direction of the core unit 120 in contact with the first core guide 114a, so that the movement speed does not increase rapidly, and the core rib 122a moves according to the pressure of the elastic member 130 and the contact force between the core rib 122a and the first core guide 114a that exceeds the pressure, thereby controlling the discharge pressure of the refrigerant and reducing the noise and vibration caused by pulsation.

[0124] For example, when high-pressure refrigerant is applied to the core unit 120, the refrigerant enters through the first main inlet portion 111a and the second main inlet portion 111b as indicated by the arrows, and simultaneously enters the interior of the main body 110, causing the core rib 122a to move along the first core guide 114a, compressing the elastic member 130, and allowing the refrigerant to move through the cover 140 in the direction of the arrow.

[0125] In this embodiment, the elastic member 130 is inserted into the lower side of the second core part 124 and supported by the lower side of the cover 140 to be described later, thereby providing constant elastic support to the core unit 120 .

[0126] The elastic member 130 is typically a coil spring, but may be replaced with other configurations capable of generating elastic force.

[0127] Since the elastic member 130 is partially inserted into the second core portion 124 , coupling stability is improved even when the core unit 120 moves in the axial direction of the body 110 .

[0128] In this embodiment, the discharge check valve 100 may be fixed by forcibly press-fitting into the passage 14 or by temporarily assembling into the passage 14 and then fastening with a snap ring (not shown) to prevent movement in the longitudinal direction of the passage 14 .

[0129] In addition to these fixing methods, the discharge check valve 100 may be fixed by being temporarily assembled into the passage 14 and then stacked on the upper side of the oil separator and fastened via a force-fitting method, welding, or a screw structure.

[0130] Although described through example embodiments of the present invention, those skilled in the art will appreciate that various modifications and changes may be made to the present invention, such as additions, changes and deletions of parts, without departing from the spirit and scope of the present invention as set forth in the appended claims, and that such modifications and changes are also included within the scope of the present invention.

[0131] Industrial Applicability

[0132] The preferred embodiment is applicable to a scroll compressor.

Claims

1. A scroll compressor, comprising: a compression unit coupled to one side of the drive unit; a rear housing including a discharge chamber from which the refrigerant compressed in the compression unit is discharged and a passage formed with a flow path for the refrigerant to be discharged; as well as a discharge check valve installed in the passage to supply refrigerant to the discharge port by changing an opening degree based on a pressure of the refrigerant, Wherein, the discharge check valve comprises: a main body connected to the passage and including a main inlet port through which refrigerant and oil are introduced; a core unit configured to move inside the body based on pressure of a refrigerant; and An inner diameter variable flow path is formed by an inner diameter of the body that varies in an axial direction. 2 . The scroll compressor according to claim 1 , further comprising an inlet hole connected to the discharge chamber, through which refrigerant is introduced, and the refrigerant moving through the inlet hole collides with the discharge check valve, thereby causing some oil to separate. 3 . The scroll compressor according to claim 1 , further comprising an elastic member configured to support the core unit.

4. The scroll compressor according to claim 1, wherein: The main inlet port comprises: a first main inlet portion which is temporarily held in a closed state by the core unit before the core unit moves to an upper portion of the body; and A second main entrance portion, which is arranged symmetrically with respect to an imaginary line drawn based on the first main entrance portion, remains continuously open.

5. The scroll compressor according to claim 4, wherein: The second main entrance portion is arranged bilaterally symmetrically with respect to the first main entrance portion.

6. The scroll compressor according to claim 1, wherein: The inner diameter variable flow path includes an expansion section in which an opening cross-sectional area increases as a pressure difference based on movement of the core unit increases.

7. The scroll compressor according to claim 6, wherein: The expansion section expands over a predetermined section.

8. The scroll compressor according to claim 6, wherein: The inner diameter variable flow path is formed to be inclined outwardly toward a radial direction from a bottom to a top of the body.

9. The scroll compressor according to claim 4, wherein: The variable inner diameter flow path is connected to the second main inlet portion.

10. The scroll compressor according to claim 9, wherein: The variable inner diameter flow path is arranged inside the body symmetrically with respect to an imaginary center line along the axis of the body.

11. The scroll compressor according to claim 1, wherein: The body has a cover coupled to an upper end portion of the body, and the cover includes a cover opening formed on an upper surface along a circumferential direction to allow refrigerant passing through the core unit to move to the discharge port.

12. The scroll compressor according to claim 11, wherein: The cover is formed with an outer diameter greater than that of the body, and is coupled to the passage.

13. The scroll compressor according to claim 12, wherein: The cover comprises: a rib formed at a center of the upper surface; and A bridge portion is formed to partition between the cover openings based on the rib.

14. The scroll compressor according to claim 13, wherein: The bridge portion at least partially overlaps the inner diameter variable flow path in the axial direction.

15. The scroll compressor according to claim 1, wherein: The core unit comprises: a first core portion extending axially with an outer diameter corresponding to the inner diameter of the body and having core ribs formed on an outer surface of the first core portion; a second core portion formed integrally with the first core portion and extending from a top portion of the first core portion where the refrigerant is discharged; a third core portion which is integrally formed with the first core portion and extends from a bottom portion of the first core portion into which refrigerant is introduced, and has a diameter different from that of the first core portion; and wherein the body includes core guide parts positioned to face each other inside the body to guide the movement of the core unit, Herein, the core guide portion includes a first core guide into which the core rib portion is inserted.

16. The scroll compressor according to claim 15, wherein: The core unit is positioned by aligning a bottom surface of the third core portion with a bottom surface of the body before being actuated by refrigerant.

17. The scroll compressor according to claim 15, wherein: The core guide portion includes a second core guide formed adjacent to the guide groove on the core guide portion and partially in contact with an outer surface of the core unit to facilitate axial movement of the body.

18. The scroll compressor according to claim 17, wherein: The second core guide maintains a curvature corresponding to an outer curvature of the core unit.

19. The scroll compressor according to claim 15, wherein: The core guide portion is arranged to intersect the inner diameter variable flow path.

20. The scroll compressor according to claim 19, wherein: The core guide portion comprises: a first opening wall inclined in a direction in which an opening area of ​​the variable inner diameter flow path increases; and The second opening wall extends from the extending end of the first opening wall toward the axial upper side by a predetermined length and maintains a constant opening cross-sectional area.

21. The scroll compressor according to claim 17, wherein: The core guide portion is arranged to intersect the inner diameter variable flow path.

22. The scroll compressor according to claim 21, wherein: The core guide portion includes: a first opening wall, which is inclined in a direction in which the opening area of ​​the inner diameter variable flow path increases; and a second opening wall, which extends a predetermined length from an extended end of the first opening wall toward the axial upper side and maintains a constant opening cross-sectional area.

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