Scroll compressor with back pressure circulation structure

Abstract

This disclosure relates to a scroll compressor for a vehicle air conditioning system, comprising a back pressure circulation structure. Oil and refrigerant discharged from the back pressure chamber to maintain back pressure are discharged directly toward the scroll section to ensure refrigerant circulation. This structural simplification reduces the size of the package containing the scroll compressor.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of Korean Patent Application No. 10-2022-0056651, filed on May 9, 2022, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to a scroll compressor for an air conditioning system in a vehicle, and more specifically, to a scroll compressor having a back pressure circulation structure configured such that oil and refrigerant discharged from the back pressure chamber to maintain back pressure are discharged directly toward the scroll to ensure refrigerant circulation. Background Technology

[0004] Typically, a scroll compressor is a cooling and heating component in an air conditioning system. A scroll compressor draws in low-temperature, low-pressure refrigerant from the evaporator, compresses it into high-temperature, high-pressure refrigerant, and then discharges the high-temperature, high-pressure refrigerant to one of several compressors in the condenser.

[0005] Such a scroll compressor typically includes: a housing having an inlet; a rotating shaft connected to a rotor disposed inside a stator within the housing; a rotating scroll connected to the rotating shaft for revolving; a fixed scroll engaging with the rotating scroll to define a pair of compression chambers; a main frame coupled to the fixed scroll for mounting on the housing, with the rotating scroll positioned between the main frame and the fixed scroll; an anti-rotation unit to prevent the rotating scroll from rotating on its axis; and a top cover having an oil separator and an outlet. The scroll compressor operates as follows.

[0006] The refrigerant gas drawn in through the inlet flows into the compression chamber, which is defined by the junction of a rotating vortex and a fixed vortex, so as to be compressed in the compression chamber.

[0007] The compressed refrigerant gas is discharged from the center of the fixed vortex section. Oil separates from the refrigerant gas and moves to the oil reservoir, while the refrigerant gas is discharged through the outlet.

[0008] At this point, leakage occurs due to the gas pressure generated by the compression of the refrigerant gas in the tangential, axial, and radial directions. Various structures exist to reduce this leakage, including fixed vortex back pressure systems, rotating vortex back pressure systems, and top sealing systems, to minimize leakage caused by the gas pressure generated in the axial direction.

[0009] However, when using the pressure of the back pressure chamber, excessively low pressure can increase clearance, thus reducing vortex performance. Excessively high pressure can increase wear, leading to structural problems. For these reasons, the pressure needs to be regulated to a predetermined level. When the pressure is high, it is necessary to depressurize to reduce the pressure in the back pressure chamber. Since the pressure in the back pressure chamber is higher than the intake pressure, depressurization is necessary before releasing the pressure.

[0010] Therefore, in the prior art, when the refrigerant moves through the gap between the bearing and the shaft located at the far end of the rotating shaft, or when the refrigerant is discharged toward the motor housing, the hollow space of the rotating shaft is used to reduce the pressure of the refrigerant. A separate pressure reducing device for pressure reduction can be provided on the motor housing side.

[0011] However, with the increased flow paths for refrigerant and oil, oil may not be supplied in case of insufficient oil. Since a separate structure is applied to the motor housing side, the overall size may increase, which is disadvantageous during encapsulation.

[0012] The foregoing is intended only to help understand the background of this disclosure and is not intended to imply that this disclosure falls within the scope of prior art known to those skilled in the art. Summary of the Invention

[0013] Therefore, this disclosure discloses a scroll compressor with a back-pressure circulation structure, which is configured such that oil and refrigerant discharged from the back-pressure chamber to maintain back pressure are discharged directly toward the scroll section to ensure refrigerant and oil circulation. Compared to conventional devices, the back-pressure circulation structure of this disclosure has a simplified structure, thus allowing for a reduction in the overall size of the package containing the scroll compressor. The scroll compressor of this disclosure can be integrated into a vehicle's air conditioning system.

[0014] To achieve the above objectives, according to one aspect of this disclosure, a scroll compressor with a back-pressure circulation structure is provided. The scroll compressor may include: a motor housing; a main frame mounted on the motor housing; a drive shaft connected to a motor disposed inside the motor housing to rotate using rotational force received from the motor; a rotating scroll portion disposed on the main frame, rotatably connected to the drive shaft, and including a helical rotating scroll ring; a back-pressure chamber disposed on one side of the rotating scroll portion within the main frame; a fixed scroll portion including a helical fixed scroll ring configured to match and engage with the rotating scroll ring of the rotating scroll portion; and a recovery flow path disposed in the main frame and extending from the back-pressure chamber to communicate with the fixed scroll portion. The fixed scroll portion may include a pressure-reducing section comprising a connecting hole spaced apart from the fixed scroll ring and communicating with the recovery flow path, a flow path extending from the connecting hole, and an opening at the distal end of the flow path opening toward the rotating scroll ring and the fixed scroll ring.

[0015] The recovery flow path may include a first recovery path extending from the back pressure chamber and a second recovery path branching from the first recovery path to communicate with the fixed vortex section.

[0016] The diameter of the first recycling path can be larger than the diameter of the second recycling path.

[0017] The second recovery path may branch off from the first recovery path at a position spaced apart from the far end of the first recovery path, thereby defining an acute angle between the first and second recovery paths.

[0018] The flow path can be set outside the fixed vortex and spaced apart from the fixed vortex, and bend along the fixed vortex.

[0019] Multiple openings can be provided to face the rotating vortex and the fixed vortex in both outward and inward directions.

[0020] According to another aspect of this disclosure, a scroll compressor with a back pressure circulation structure is provided. The scroll compressor may include: a motor housing; a main frame mounted on the motor housing; a drive shaft connected to a motor disposed within the motor housing to rotate using rotational force received from the motor; a rotating scroll portion disposed on the main frame, rotatably connected to the drive shaft, and including a helical rotating scroll ring; a back pressure chamber disposed on one side of the rotating scroll portion within the main frame; a fixed scroll portion including a helical fixed scroll ring configured to match and engage with the rotating scroll ring of the rotating scroll portion; a recovery flow path disposed in the main frame and extending from the back pressure chamber to communicate with the fixed scroll portion; and an oil filter disposed on the recovery flow path to filter foreign matter contained in the fluid discharged from the back pressure chamber. The fixed scroll portion may include a pressure-reducing section comprising a connecting hole spaced apart from the fixed scroll ring and communicating with the recovery flow path, a flow path extending from the connecting hole, and an opening at the distal end of the flow path toward the rotating scroll ring and the fixed scroll ring.

[0021] The recovery flow path may include a first recovery path extending from the back pressure chamber and a second recovery path branching from the first recovery path to communicate with the fixed vortex section. An oil filter may be disposed on the first recovery path, and the second recovery path may branch from the first recovery path at a location spaced apart from the oil filter.

[0022] According to another aspect of this disclosure, a scroll compressor with a back pressure circulation structure is provided. The scroll compressor may include: a motor housing; a main frame mounted on the motor housing; a drive shaft connected to a motor disposed within the motor housing to rotate using rotational force received from the motor; a rotating scroll portion disposed on the main frame, rotatably connected to the drive shaft, and including a helical rotating scroll ring; a back pressure chamber disposed on one side of the rotating scroll portion within the main frame; a fixed scroll portion including a helical fixed scroll ring configured to match and engage with the rotating scroll ring of the rotating scroll portion; a recovery flow path disposed in the main frame and extending from the back pressure chamber to communicate with the fixed scroll portion; and a pressure reducing unit disposed on the recovery flow path to reduce the pressure of fluid flowing from the back pressure chamber toward the fixed scroll portion and the rotating scroll portion. The fixed scroll portion may include a pressure reducing section comprising a connecting hole spaced apart from the fixed scroll ring and communicating with the recovery flow path, a flow path extending from the connecting hole, and an opening at the distal end of the flow path toward the rotating scroll ring and the fixed scroll ring.

[0023] The pressure relief unit may include multiple chambers and through holes connecting the chambers.

[0024] The pressure relief unit can be configured such that the through holes do not overlap in the length direction of each chamber.

[0025] In a scroll compressor with the back pressure circulation structure described above, the refrigerant and oil discharged from the back pressure chamber to maintain back pressure can be discharged directly toward the scroll section to ensure the circulation of refrigerant and oil, and the size of the package containing the scroll compressor can be reduced by simplifying the structure compared to conventional devices. Attached Figure Description

[0026] The above and other objects, features and other advantages of this disclosure will become clearer from the following detailed description, taken in conjunction with the accompanying drawings, in which:

[0027] Figure 1 This is a cross-sectional side view showing a scroll compressor with a back pressure circulation structure according to the present disclosure;

[0028] Figure 2 It shows the use Figure 1 An end view of the fixed scroll section of a scroll compressor with a back-pressure circulation structure;

[0029] Figure 3 This is a cross-sectional side view showing an embodiment of a scroll compressor according to the present disclosure;

[0030] Figure 4 This is a cross-sectional side view showing another embodiment of the scroll compressor according to the present disclosure; and

[0031] Figure 5 This is a perspective view of the pressure reduction unit according to this disclosure. Detailed Implementation

[0032] It is understood that the terms “vehicle” or “of a vehicle” or other similar terms as used herein generally include motor vehicles, such as passenger cars including sport utility vehicles (SUVs), buses, trucks, various commercial vehicles, watercraft including various ships and vessels, aircraft, etc., and may also include hybrid vehicles, electric vehicles, plug-in hybrid vehicles, hydrogen-powered vehicles, and other alternative fuel vehicles (e.g., fuels derived from resources other than petroleum). As referred to herein, a hybrid vehicle is a vehicle having two or more power sources, such as a gasoline-powered vehicle and an electric-powered vehicle.

[0033] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” are intended to include the plural forms as used herein. It will be further understood that, when used in this specification, the terms “comprising” and / or “including” specifically describe the presence of the mentioned features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. Throughout this specification, unless explicitly stated otherwise, the word “comprising” and variations such as “including” or “containing” will be understood to imply the inclusion of the mentioned elements but not exclude any other elements. Additionally, the terms “-unit,” “-device,” “-part,” and “module” described in the specification refer to a unit that processes at least one function and operation and can be implemented by hardware components or software components and combinations thereof.

[0034] Furthermore, the control logic of this disclosure can be implemented as a non-transitory computer-readable medium containing executable program instructions that are executed by a processor, controller, etc. Examples of computer-readable media include, but are not limited to, ROM, RAM, CD-ROM, magnetic tape, floppy disk, flash drive, smart card, and optical data storage device. The computer-readable medium can also be distributed across a networked computer system, enabling it to be stored and operated in a distributed manner, for example, via a telematics server or a controller area network (CAN).

[0035] In the following, a scroll compressor with a back pressure circulation structure for an air conditioning system for a vehicle according to an exemplary embodiment of the present disclosure will be described with reference to the accompanying drawings.

[0036] In the following, embodiments disclosed herein will be described in detail with reference to the accompanying drawings, wherein identical or similar constituent elements are given the same reference numerals regardless of the reference numerals used in the drawings, and repeated descriptions of identical or similar constituent elements will be omitted.

[0037] In the description of this disclosure, detailed descriptions of related technologies are omitted where it is determined that such detailed descriptions would obscure the main points of the disclosure. Furthermore, the accompanying drawings are merely intended to facilitate a preliminary understanding of the embodiments disclosed herein; therefore, the technical concepts disclosed herein are not limited to the drawings and should be understood to include all modifications, equivalents, and substitutions within the scope of the ideas and techniques of this disclosure.

[0038] It will be understood that while the terms “first,” “second,” etc., may be used in this document to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another.

[0039] What will be understood is that when a component is referred to as “connected,” “linked,” or “attached” to another component, it can be directly connected or attached to the other component, or there may be an intermediate component between them. Conversely, it should be understood that when a component is referred to as “directly connected,” “directly attached,” or “directly linked” to another component, there is no intermediate component.

[0040] In the following, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Throughout the drawings, the same reference numerals will refer to the same or similar parts.

[0041] Figure 1 This is a cross-sectional side view showing a scroll compressor with a back pressure circulation structure according to the present disclosure. Figure 2 It shows the use Figure 1 The end view of the fixed scroll section of the scroll compressor with the back pressure circulation structure shown. Figure 3 This is a cross-sectional side view showing an embodiment of a scroll compressor according to the present disclosure. Figure 4 This is a cross-sectional side view showing another embodiment of the scroll compressor according to the present disclosure, and Figure 5 This is a perspective view showing the pressure reduction unit according to the present disclosure.

[0042] like Figure 1 and Figure 2As shown, the scroll compressor with a back pressure circulation structure according to this disclosure includes: a motor housing H; a main frame 10 mounted on the motor housing H; a drive shaft 30 connected to a motor 20 disposed within the motor housing H to rotate using rotational force received from the motor 20; a rotating scroll portion 40 disposed on the main frame 10, rotatably connected to the drive shaft 30, and including a helical rotating scroll ring 41; a back pressure chamber 11 disposed on one side of the rotating scroll portion 40 within the main frame 10; a fixed scroll portion 50 including a helical fixed scroll ring 51 configured to match and engage with the rotating scroll ring 41 of the rotating scroll portion 40; and a recovery flow path 12 disposed in the main frame 10 and extending from the back pressure chamber 11 to communicate with the fixed scroll portion 50.

[0043] The main frame 10 is connected to one surface of the motor housing H, and the rotating scroll 40 is mounted within the main frame 10 to achieve scroll compression. Additionally, the motor 20 is disposed within the motor housing H to generate rotational power by receiving electrical electricity. The drive shaft 30 is connected to the motor 20 to rotate via the operation of the motor 20. The rotating scroll 40 is connected to the drive shaft 30 to rotate together with the drive shaft 30, and a helical rotating vortex 41 is disposed on the rotating scroll 40.

[0044] Additionally, the fixed scroll portion 50 is positioned within the main frame 10 to match the rotating scroll portion 40 and is configured to engage with the rotating scroll portion 40. The fixed scroll portion 50 is provided with a helical fixed scroll 51 disposed inside and configured to engage with the rotating scroll 41 of the rotating scroll portion 40. With this configuration, a compression chamber is defined between the fixed scroll 51 and the rotating scroll 41. When the rotating scroll portion 40 rotates, a fluid containing refrigerant and oil enters the compression chamber. In response to the rotation of the rotating scroll 41, the space of the compression chamber decreases, causing the fluid to be compressed and then discharged from the compression chamber.

[0045] Additionally, a back pressure chamber 11 is disposed between the main frame 10 and the rotating scroll portion 40. In response to the pressure on one side of the rotating scroll portion 40 within the back pressure chamber 11, the back pressure chamber 11 pushes the rotating scroll portion 40 toward the fixed scroll portion 50. The back pressure chamber 11 may be equipped with a valve or a pressure reducing device to allow oil with a suitable pressure to be supplied to the back pressure chamber 11.

[0046] This disclosure aims to overcome problems caused by excessively low or high pressure generated within the back pressure chamber 11 when the pressure of the back pressure chamber 11 supports the rotating vortex section 40. The recovery flow path 12 is configured to regulate the pressure within the back pressure chamber 11 to an appropriate level. That is, when the pressure in the back pressure chamber 11 is too low, the clearance may increase, thereby reducing the performance responsive to the drive of each vortex section. When the pressure in the back pressure chamber 11 is too high, wear may occur, leading to structural problems.

[0047] Therefore, the pressure inside the back pressure chamber 11 needs to be adjusted to a suitable level. In particular, when the pressure is high, fluid needs to be released to reduce the pressure inside the back pressure chamber 11. Since the pressure inside the back pressure chamber 11 is higher than the intake pressure, pressure reduction is necessary before any other pressure reduction is required.

[0048] Therefore, in an embodiment according to this disclosure, the recovery flow path 12 extends from the back pressure chamber 11 to communicate with the fixed vortex section 50.

[0049] Additionally, the fixed vortex section 50 includes a pressure reduction section 52, which has a communication hole 53 spaced apart from the fixed vortex 51 and communicating with the recovery flow path 12, a flow path 54 extending from the communication hole 53, and an opening hole 55 provided at the far end of the flow path 54 to open toward the rotating vortex 41 and the fixed vortex 51.

[0050] According to this configuration, a fluid comprising refrigerant gas and oil flows from the back pressure chamber 11 through the recovery flow path 12 to enter the communication hole 53 of the fixed vortex section 50. After being depressurized while passing through the flow path 54, the fluid flows through the opening hole 55 toward the rotating vortex 41 and the fixed vortex 51.

[0051] Here, the recovery flow path 12 connects to the communication hole 53 of the back pressure chamber 11 and the fixed vortex section 50 to provide a path for fluid to flow from the back pressure chamber 11 to the fixed vortex 51 and the rotating vortex 41. The recovery flow path 12 includes a first recovery path 12a extending from the back pressure chamber 11 and a second recovery path 12b branching from the first recovery path 12a to communicate with the fixed vortex section 50.

[0052] In this way, the recovery flow path 12 includes a first recovery path 12a and a second recovery path 12b, such that the fluid discharged from the back pressure chamber 11 flows from the first recovery path 12a to the second recovery path 12b, and then flows to the pressure-reducing section 52 of the fixed vortex section 50. Specifically, due to the extended shape of the first recovery path 12a and the second recovery path 12b of the recovery flow path 12, the distance from the back pressure chamber 11 to the pressure-reducing section 52 of the fixed vortex section 50 can be reduced. Therefore, even if there is insufficient oil in the fixed vortex section 50 and the swirling vortex section 40, fluid including the oil in the back pressure chamber 11 can be quickly supplied through the recovery flow path 12.

[0053] Furthermore, the diameter of the first recovery path 12a can be made larger than the diameter of the second recovery path 12b. Due to the diameter difference between the first recovery path 12a and the second recovery path 12b, a pressure reduction effect is generated through the orifice structure. The diameter difference between the first recovery path 12a and the second recovery path 12b can be determined according to the degree of pressure reduction of the fluid.

[0054] Furthermore, the second recovery path 12b may branch off from the first recovery path 12a at a position spaced apart from the distal end of the first recovery path 12a, thus defining an acute angle between the first recovery path 12a and the second recovery path 12b. Therefore, the recovery flow path 12 can be designed such that the first recovery path 12a does not interfere with the bearing structure or central head component in the main frame 10, and the second recovery path 12b connects to the pressure-reducing section 52 of the fixed vortex section 50. Moreover, the fluid flowing in the back pressure chamber 11 fills the recovery path 12a and then flows to the second recovery path 12b, thereby generating a pressure-reducing effect in the recovery flow path 12.

[0055] Additionally, according to an embodiment of the recycling flow path 12, such as Figure 3 As shown, the oil filter 60 can be disposed in the recovery flow path 12. That is, the oil filter 60 can be disposed on the first recovery path 12a, and the second recovery path 12b can branch off from the first recovery path 12a at a position spaced apart from the oil filter 60. In this way, the oil filter 60 is configured such that when fluid from the back pressure chamber 11 flows through the recovery flow path 12 toward the pressure reducing section 52 of the fixed vortex section 50, the fluid passes through the oil filter 60. That is, friction occurs between components including the drive shaft 30 in the back pressure chamber 11. Friction between components generates foreign matter, and when foreign matter is introduced toward the fixed vortex 51 or the rotating vortex 41, it may damage the components. Therefore, since the oil filter 60 is disposed on the first recovery path 12a of the recovery flow path 12, foreign matter contained in the fluid discharged from the back pressure chamber 11 can be filtered, thereby improving the durability of each vortex section. In addition, the fluid discharged from the back pressure chamber 11 through the oil filter 60 can also produce a pressure reducing effect.

[0056] Additionally, according to another embodiment of the recycling flow path 12, such as Figure 4 As shown, the pressure reducing unit 70 can be disposed in the recovery flow path 12. That is, the pressure reducing unit 70 is disposed on the first recovery path 12a. The pressure reducing unit 70 includes a plurality of chambers 71 and through holes 72 connecting the chambers 71. The pressure reducing unit 70 is configured to allow fluid to be supplied to the back pressure chamber 11 at a suitable pressure. The pressure reducing unit 70 is disposed on the first recovery path 12a of the recovery flow path 12 to reduce the pressure of the fluid flowing from the back pressure chamber 11 to the fixed vortex section 50 and the swirling vortex section 40.

[0057] The pressure reducing unit 70 includes multiple chambers 71 and through holes 72 connecting the chambers 71. With this configuration, the oil in the fluid can be depressurized due to throttling that occurs in the fluid passing through the chambers 71 and through holes 72.

[0058] Specifically, the pressure-reducing unit 70 is configured such that the through holes 72 do not overlap in the longitudinal direction of the respective chambers 71. For example... Figure 5 As shown, in the pressure reducing unit 70, the plurality of through holes 72 connecting the chambers 71 are arranged such that the centers of the through holes 72 are not coaxial and are staggered so as not to overlap each other in the length direction. Therefore, the pressure reducing effect caused by the fluid flowing through the plurality of chambers 71 and through holes 72 of the pressure reducing unit 70 can be increased.

[0059] In addition, the fluid flowing from the back pressure chamber 11 to the pressure reduction section 52 of the fixed vortex section 50 through the recovery flow path 12 can be depressurized again when passing through the pressure reduction section 52, and then flow to the fixed vortex 51 and the rotating vortex 41.

[0060] Since the pressure reducing section 52 includes a connecting hole 53 spaced apart from the fixed vortex 51 and communicating with the recovery flow path 12, a flow path 54 extending from the connecting hole 53, and an opening hole 55 provided at the far end of the flow path 54 to open toward the rotating vortex 41 and the fixed vortex 51a, the fluid entering through the connecting hole 53 is depressurized when passing through the pressure reducing flow path, and then flows through the opening hole 55 to the rotating vortex 41 and the fixed vortex 51.

[0061] Here, the flow path 54 can be positioned outside the fixed vortex 51 and spaced apart from it, and can bend along the fixed vortex 51. That is, the pressure-reducing section 52 can be positioned outside the fixed vortex 51 and spaced apart from it to avoid interference. Furthermore, the fluid is discharged while gradually flowing inward in response to the rotation of the vortex section 40. Because the pressure-reducing section 52 is positioned outside the fixed vortex 51 and spaced apart from it, the fluid discharged through the opening 55 of the pressure-reducing section 52 can move from the outside to the inside in response to the rotation of the vortex section 40.

[0062] Furthermore, in the pressure-reducing section 52, the flow path 54 extends while curving along the fixed vortex 51 so as not to interfere with the fixed vortex 51. Therefore, an extended length can be obtained, thereby achieving a pressure-reducing effect through the pressure-reducing flow path.

[0063] Additionally, multiple openings 55 can be provided to open towards the rotating vortex 41 and the fixed vortex 51 in both outward and inward directions. Because multiple openings 55 are provided in this way, the discharge pressure of the fluid flowing through the flow path 54 is reduced when the fluid is discharged through the multiple openings 55.

[0064] As described above, this disclosure allows fluid to flow through a recovery flow path 12, which communicates with the back pressure chamber 11 of the main frame 10, and then through a pressure-reducing section 52 located outside the fixed vortex section 50. Specifically, the recovery flow path 12 is equipped with an oil filter 60 or a pressure-reducing unit 70, through which primary pressure reduction of the fluid is performed, and secondary pressure reduction of the fluid is performed through the flow path 54 of the pressure-reducing section 52.

[0065] Furthermore, the recovery flow path 12, which connects directly from the back pressure chamber 11 to the pressure-reducing section 52 of the fixed vortex section 50, has a shorter length than the fluid flow path of the hollow path of the prior art motor 20 or the separate path through the motor housing. Therefore, oil can be supplied rapidly to each vortex section at a sufficient flow rate, thereby improving the durability of both the fixed vortex section 50 and the rotating vortex section 40.

[0066] While exemplary embodiments of this disclosure have been described for illustrative purposes, those skilled in the art will understand that various modifications, additions, and substitutions may be made without departing from the scope and spirit of this disclosure as disclosed in the appended claims.

Claims

1. A scroll compressor having a back pressure circulation structure, comprising: Motor housing; The main frame is mounted on the motor housing; A drive shaft is connected to a motor housed within the motor housing to rotate using rotational force received from the motor. A swirling vortex is disposed on the main frame and connected to the drive shaft in a swirling manner, and includes a helical swirling vortex. The back pressure chamber is located on one side of the rotating vortex section within the main frame; A fixed vortex portion includes a helical fixed vortex ring that matches and engages with the revolving vortex ring of the revolving vortex portion; and A recovery flow path is provided within the main frame and extends from the back pressure chamber to communicate with the fixed vortex section. The fixed vortex section includes a pressure-reducing section, which has a connecting hole spaced apart from the fixed vortex and communicating with the recovery flow path, a flow path extending from the connecting hole, and an opening at the distal end of the flow path that faces the rotating vortex and the fixed vortex. In the pressure-reducing section, the flow path is located outside the fixed vortex and spaced apart from it, and bends along the fixed vortex. In the pressure reduction section, a plurality of openings are provided. One of the plurality of openings opens toward the rotating vortex in the outward direction, and another of the plurality of openings opens toward the fixed vortex in the inward direction.

2. The scroll compressor of claim 1, wherein, The recovery flow path includes a first recovery path extending from the back pressure chamber and a second recovery path branching from the first recovery path to communicate with the fixed vortex section.

3. The scroll compressor of claim 2, wherein, The diameter of the first recycling path is greater than the diameter of the second recycling path.

4. The scroll compressor of claim 2, wherein, The second recycling path branches off from the first recycling path at a position spaced apart from the far end of the first recycling path, such that an acute angle is defined in the main frame between the first and second recycling paths.

5. The scroll compressor according to claim 2, further comprising: An oil filter is provided in the recovery flow path to filter out foreign matter contained in the fluid discharged from the back pressure chamber.

6. The scroll compressor according to claim 5, wherein, The oil filter is disposed on the first recovery path, and the second recovery path branches off from the first recovery path at a position spaced apart from the oil filter.

7. The scroll compressor according to claim 1, further comprising: A pressure reducing unit is provided on the recovery flow path to reduce the pressure of the fluid flowing from the back pressure chamber toward the fixed vortex and the swirling vortex.

8. The scroll compressor according to claim 7, wherein, The pressure relief unit includes multiple chambers and through holes connecting the chambers.

9. The scroll compressor according to claim 8, wherein, The pressure relief unit is configured such that the through holes do not overlap in the length direction of each of the chambers.

10. An air conditioning system for a vehicle, comprising a scroll compressor according to claim 1.

11. A vehicle comprising a scroll compressor according to claim 1.

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