Scroll compressor

Abstract

The utility model relates to a scroll compressor, the scroll compressor includes scroll compressor mechanism and be used for supporting scroll compressor mechanism main bearing seat, in the inside of scroll compressor mechanism is defined with working chamber and is used for introducing the suction area of working fluid into working chamber, scroll compressor mechanism includes fixed scroll and the dynamic scroll with fixed scroll cooperation, fixed scroll includes the outer peripheral wall and sets up on the outer peripheral surface of outer peripheral wall fixed key, and main bearing seat includes fixed key groove, fixed key and fixed key groove each other cooperation to form the circumferential positioning structure for making fixed scroll relative main bearing seat in the circumferential direction positioning, wherein, in the outer peripheral wall is provided with the bypass channel extending through the outer peripheral wall, the radial inner end of bypass channel communicates with suction area, and the radial outer end of bypass channel is positioned to be adjacent to circumferential positioning structure so as to be able to guide the working fluid in suction area to circumferential positioning structure. The scroll compressor can improve the lubrication to circumferential positioning structure.

Description

Technical Field

[0001] This utility model relates to the field of scroll compressors, and in particular, to improving the lubrication of the fixed scroll and the positioning structure of the main bearing housing of a scroll compressor. Background Technology

[0002] The content in this section provides only background information related to this disclosure and may not constitute prior art.

[0003] A scroll compressor includes a scroll compression mechanism consisting of a moving scroll and a stationary scroll, and a main bearing housing for supporting the scroll compression mechanism. Typically, the stationary scroll mates with the main bearing housing, fixing the stationary scroll approximately relative to the main bearing housing in the circumferential direction to prevent rotation of the stationary scroll around its axis. A commonly used positioning structure in related scroll compressors for achieving the mating of the stationary scroll and the main bearing housing is a circumferential positioning structure. This structure includes a locating key on the outer circumferential surface of the stationary scroll and a locating keyway in the annular circumferential wall of the main bearing housing. The locating key engages with the locating keyway, restricting its movement in the circumferential direction by the side of the locating keyway, thereby limiting the movement of the stationary scroll relative to the main bearing housing in the circumferential direction.

[0004] The problem with the circumferential positioning structure between the fixed scroll and the main bearing housing in the aforementioned scroll compressor mechanism lies in the insufficient airflow at the mating part of the circumferential positioning structure (i.e., the contact surface between the locating key and the locating keyway). The contact area of ​​this mating part is relatively small, while during the operation of the scroll compressor, this mating part bears a large load (e.g., approximately 10,000 N) and experiences high temperatures. Under these circumstances, the mating part of the circumferential positioning structure typically does not receive sufficient lubrication during the operation of the scroll compressor, leading to severe wear of this part. This, in turn, affects the stability of the fit between the fixed scroll and the main bearing housing, and consequently, the operational stability of the scroll compressor.

[0005] Therefore, there is a need for an improved scroll compressor with an improved lubrication structure to improve the lubrication of the circumferential positioning structure between the fixed scroll and the main bearing housing, thereby reducing wear on the mating parts of the circumferential positioning structure and improving the operational stability of the scroll compressor. Utility Model Content

[0006] This section provides a general summary of the present invention, rather than a full disclosure of the complete scope or all features of the present invention.

[0007] The purpose of this invention is to solve or alleviate at least one of the technical problems mentioned above. For example, the technical solution of this invention can provide a scroll compressor mechanism with an improved lubrication structure to ensure that the fixed scroll of the scroll compressor and the circumferential positioning structure of the main bearing housing are adequately lubricated, thereby reducing the wear of the circumferential positioning structure.

[0008] To address one or more of the aforementioned technical problems, according to one aspect of the present invention, a scroll compressor is provided. The scroll compressor includes a scroll compression mechanism and a main bearing housing for supporting the scroll compression mechanism. A working chamber and an intake region for introducing working fluid into the working chamber are defined within the scroll compression mechanism. The scroll compression mechanism includes a fixed scroll and a moving scroll cooperating with the fixed scroll. The fixed scroll includes an outer peripheral wall and a locating key disposed on the outer peripheral surface of the outer peripheral wall. The main bearing housing includes a locating keyway, the locating key and the locating keyway cooperating to form a circumferential positioning structure for positioning the fixed scroll relative to the main bearing housing in the circumferential direction. A bypass channel extending through the outer peripheral wall is provided in the outer peripheral wall, the radially inner end of the bypass channel communicating with the intake region, and the radially outer end of the bypass channel positioned adjacent to the circumferential positioning structure so as to guide the working fluid in the intake region to the circumferential positioning structure.

[0009] In the aforementioned scroll compressor, the main bearing housing includes an annular peripheral wall, wherein a locating keyway is provided at the annular peripheral wall.

[0010] In the aforementioned scroll compressor, the bypass passage extends in the radial direction.

[0011] In the aforementioned scroll compressor, the inner circumferential surface of the outer circumferential wall includes a suction surface for defining the suction area. The starting position of the suction surface is the position of the inner circumferential surface corresponding to the starting end of the moving scroll blade of the moving scroll in the circumferential direction, and the ending position of the suction surface is the position where the inner circumferential surface can tightly mesh with the moving scroll blade. The radial inner end of the bypass channel is located between the starting position and the ending position in the circumferential direction.

[0012] In the aforementioned scroll compressor, the distance between the radial inner end of the bypass channel and the starting position in the circumferential direction is greater than the distance between the radial inner end of the bypass channel and the ending position in the circumferential direction.

[0013] In the aforementioned scroll compressor, the scroll compressor includes multiple circumferential positioning structures. Among these, one of the multiple circumferential positioning structures is the main circumferential positioning structure. The positioning key and positioning keyway of the main circumferential positioning structure are fitted together. Furthermore, the radial outer end of the bypass channel is positioned adjacent to the main circumferential positioning structure.

[0014] In the aforementioned scroll compressor, the circumferential positioning structures other than the main circumferential positioning structure among the multiple circumferential positioning structures are constructed as foolproof circumferential positioning structures. In these foolproof circumferential positioning structures, the positioning key and positioning keyway are constructed to be non-adhesive to each other and thus serve as circumferential limiting functions.

[0015] In the aforementioned scroll compressor, the radial outer end of the bypass channel is positioned adjacent to the main mating part of the circumferential positioning structure. The main mating part consists of the side of the positioning key and the side of the positioning keyway that can abut against each other, and the main mating part can bear a large load.

[0016] In the aforementioned scroll compressor, during the operation of the scroll compressor, the volume of the suction region intermittently increases and decreases. When the volume of the suction region decreases, the pressure in the suction region increases, causing the pressure at the radial inner end of the bypass channel to be greater than the pressure at the radial outer end of the bypass channel. As a result, the working fluid carrying lubricating oil enters the bypass channel under the pressure difference between the radial inner end and the radial outer end and flows from the radial inner end to the radial outer end.

[0017] The advantages of the scroll compressor according to this invention are at least as follows. The scroll compressor according to this invention includes a bypass channel comprising a radially inner end communicating with the intake region of the scroll compressor mechanism and a radially outer end positioned adjacent to a circumferential positioning structure of the fixed scroll and the main bearing housing of the scroll compressor. This allows the working fluid containing lubricating oil in the intake region to be guided to the circumferential positioning structure, thereby ensuring sufficient lubrication of the contact surfaces of the circumferential positioning structure and reducing the temperature at the contact surfaces, thus reducing wear on the contact surfaces of the circumferential positioning structure. This, in turn, improves the stability of the fit between the fixed scroll and the main bearing housing and enhances the operational stability of the scroll compressor. Attached Figure Description

[0018] The following figures illustrate the technical features of related technologies and one or more embodiments of the vortex compression mechanism of this utility model. In the figures:

[0019] Figure 1 This is a top view of a fixed vortex and a main bearing housing according to a preferred embodiment of the present invention, wherein the fixed vortex and the main bearing housing are in a mutually cooperating state.

[0020] Figure 2 This is an exploded view of a scroll compression mechanism and a main bearing housing according to a preferred embodiment of the present invention, wherein the fixed scroll and the moving scroll constituting the scroll compression mechanism and the main bearing housing are shown separately.

[0021] Figure 3This is a top cross-sectional view of the scroll compressor mechanism and main bearing housing according to a preferred embodiment of the present invention, wherein the fixed scroll and the main bearing housing are in a mutually cooperating state and the scroll compressor is in an operating state, and the moving scroll blades are in a first position; and

[0022] Figure 4 This is a top cross-sectional view of the scroll compressor mechanism and main bearing housing according to a preferred embodiment of the present invention, wherein the fixed scroll and the main bearing housing are in a mutually cooperating state and the scroll compressor is in operation, and the moving scroll blades are in the second position. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the following detailed description of the present invention is for illustrative purposes only and is not intended to limit the present invention or its applications or uses. Furthermore, the same reference numerals are used to denote the same components in the accompanying drawings of the various embodiments.

[0024] This invention provides a scroll compressor with a bypass channel to guide sufficient lubricating oil to the circumferential positioning structure between the fixed scroll and the main bearing housing of the scroll compressor. This improves lubrication of the contact surfaces of the circumferential positioning structure, thereby reducing wear on the contact surfaces and enhancing the operational stability of the scroll compressor.

[0025] The construction and working principle of the lubrication structure of the scroll compressor according to a preferred embodiment of the present invention are described in summary with reference to the various figures in the accompanying drawings.

[0026] Figures 1-4 A scroll compressor according to a preferred embodiment of the present invention is depicted, particularly the circumferential positioning structure of the fixed scroll and the main bearing housing of the scroll compressor, and a bypass passage for improving the lubrication of the circumferential positioning structure. In the following description, reference will be made to... Figures 1-4 The present invention provides a summary description of the overall structure and working principle of the fixed scroll and main bearing housing circumferential positioning structure of a scroll compressor according to a preferred embodiment of the present invention, as well as the bypass channel for improving lubrication of the circumferential positioning structure.

[0027] Figure 1 This is a top view of a fixed vortex and a main bearing housing according to a preferred embodiment of the present invention, wherein the fixed vortex and the main bearing housing are in a mutually cooperating state. Figure 2 This is an exploded view of the scroll compressor mechanism and main bearing housing according to a preferred embodiment of the present invention, wherein the stationary scroll and the moving scroll constituting the scroll compressor mechanism, as well as the main bearing housing, are shown separately. The following will refer to... Figure 1 and Figure 2This describes a circumferential positioning structure for positioning the fixed scroll and the main bearing housing in the circumferential direction in a scroll compressor.

[0028] like Figure 1 and Figure 2As shown, the scroll compressor includes a scroll compression mechanism and a main bearing housing 30 for supporting the scroll compression mechanism in the axial direction. The scroll compression mechanism defines a working chamber for compressing the working fluid and an intake region for introducing the working fluid into the working chamber. The main bearing housing 30 is disposed within and fixedly connected to the casing of the scroll compressor (not shown). The scroll compressor includes a stationary scroll 10 and a moving scroll 20, and the stationary scroll 10 and the moving scroll 20 cooperate to form the scroll compression mechanism. The stationary scroll 10 is generally cylindrical and includes an outer peripheral wall 11 and stationary scroll blades 12 extending radially inward from the outer peripheral wall in a helical manner. During operation of the scroll compressor, the moving scroll 20 performs translational rotation relative to the stationary scroll 10 (i.e., the central axis of the moving scroll revolves around the central axis of the stationary scroll, but the moving scroll itself does not rotate around its own central axis), and the moving scroll blades 22 of the moving scroll can mesh with the stationary scroll blades 12 to form a series of working chambers between them. The main bearing housing 30 is generally cylindrical and includes an annular peripheral wall 31. The internal space defined by the annular peripheral wall 31 can accommodate the stationary scroll 10 and the moving scroll 20. The alignment and radial positioning of the stationary scroll 10 can be achieved through the engagement of the stationary scroll 10 with the main bearing housing 30 (i.e., the stationary scroll 10 is accommodated in the main bearing housing 30). The scroll compressor includes a circumferential positioning structure for positioning the stationary scroll 10 relative to the main bearing housing 30 in the circumferential direction to prevent movement of the stationary scroll 10 relative to the main bearing housing 30 in the circumferential direction, i.e., to prevent rotation of the stationary scroll 10 about its axis. The stationary scroll 10 includes a locating key, and the main bearing housing 30 includes a locating keyway, wherein, in the assembled state of the scroll compressor, the locating key and the locating keyway engage to form the circumferential positioning structure. The locating key can be disposed on the outer peripheral surface 13 of the outer peripheral wall 11 of the stationary scroll 10 and can be generally shaped as a rectangular protrusion protruding radially outward from the outer peripheral surface 13. A locating keyway can be provided on the annular peripheral wall 31 of the main bearing housing 30 and is generally in the shape of a U-shaped groove with an open upper part. When the fixed scroll 10 and the main bearing housing 30 are engaged with each other, the locating key can engage in the locating keyway, so that when the fixed scroll 10 tends to move relative to the main bearing housing 30 in the circumferential direction, the side of the locating key will abut against the corresponding side of the locating keyway, thereby preventing the fixed scroll 10 from moving relative to the main bearing housing 30 in the circumferential direction. The scroll compressor may include multiple circumferential positioning structures, one of which is the main circumferential positioning structure.The main circumferential positioning structure includes a locating key 14 and a locating keyway 34 that can mate with each other. The circumferential width of the locating keyway 34 (i.e., the distance between the two sides of the locating keyway 34) can be approximately equal to or only slightly greater than the circumferential width of the locating key 14 (i.e., the distance between the two sides of the locating key 14), such that when the locating key 14 and the locating keyway 34 mate, they fit snugly together; that is, the two opposite sides of the locating key 14 fit snugly with the corresponding two sides of the locating keyway 34. In this case, the locating key 14 can be tightly engaged in the locating keyway 34. Therefore, the main circumferential positioning structure can play a primary positioning role in the circumferential positioning of the scroll compressor 10 and the main bearing housing 30. Other circumferential positioning structures in the multiple circumferential positioning structures of the scroll compressor, besides the main circumferential positioning structure, can be constructed as foolproof circumferential positioning structures. The foolproof circumferential positioning structure includes a locating key 15 and a locating keyway 35 that can mate with each other. The circumferential width of the locating keyway 35 (i.e., the distance between the two sides of the locating keyway 35) can be greater than the circumferential width of the locating key 15 (i.e., the distance between the two sides of the locating key 15). This ensures that when the locating key 15 and the locating keyway 35 mate, they are designed to not be in direct contact, thus providing a circumferential limiting function. Specifically, a certain gap can exist between the side of the locating key 15 and the corresponding side of the locating keyway 35. For example, in the assembled state of the scroll compressor, the side of the locating key 15 and the corresponding side of the locating keyway 35 can remain non-contacting, and will remain non-contacting or only occasionally contacting each other during the operation of the scroll compressor. Therefore, the foolproof circumferential positioning structure can prevent the mating of the fixed scroll 10 and the main bearing housing 30, while only playing an auxiliary positioning role in the circumferential positioning of the fixed scroll 10 and the main bearing housing 30. In other words, the foolproof circumferential positioning structure can be understood as a so-called "quasi" circumferential positioning structure.

[0029] Figure 3 and Figure 4 This is a top cross-sectional view of the scroll compressor mechanism and main bearing housing according to a preferred embodiment of the present invention, wherein the fixed scroll and the main bearing housing are in a mutually cooperating state and the scroll compressor is in operation. Figure 3 In the middle, the moving vortex blade is in the first position, while... Figure 4 In the middle, the moving vortex blade is in the second position. The following will refer to... Figure 3 and Figure 4 The construction and working principle of a bypass channel used to facilitate lubrication of the contact surfaces of the main circumferential positioning structure are described.

[0030] like Figure 3 and Figure 4As shown, when the fixed scroll 10 of the scroll compressor and the main bearing housing 30 are in a mating state, the locating key 14 of the main circumferential locating structure is engaged in the locating keyway 34. Furthermore, when the scroll compressor is in operation, the moving scroll 20 rotates clockwise relative to the fixed scroll 10. During this clockwise rotation, the fixed scroll 10 is subjected to a force from the moving scroll 20 and tends to rotate clockwise relative to the main bearing housing 30 (i.e., move circumferentially relative to the main bearing housing 30). However, the left side of the locating key 14 abuts against the corresponding left side of the locating keyway 34, thereby preventing the fixed scroll 10 from moving circumferentially relative to the main bearing housing 30. Thus, the sides of the abutting locating key 14 ( Figure 3 The left side of the middle) and the side of the positioning keyway 34 ( Figure 3The left side portion of the main circumferential positioning structure constitutes the main mating part, which bears a large load and experiences high temperature, making it prone to wear. To provide better lubrication for the main mating part of the main circumferential positioning structure, a bypass channel 41 extending through the outer peripheral wall 11 of the fixed scroll compressor 10 is provided. The bypass channel 41 can extend radially along the scroll compressor. The radially inner end of the bypass channel 41 communicates with the intake region 40 of the scroll compressor mechanism, and the radially outer end of the bypass channel 41 is positioned adjacent to the main circumferential positioning structure to guide the working fluid in the intake region to the circumferential positioning structure. In particular, the radially outer end of the bypass channel 41 is positioned adjacent to the main mating part of the main circumferential positioning structure to facilitate the guidance of the working fluid in the intake region 40 to the main mating part, so that the lubricating oil in the working fluid lubricates the main mating part. To reduce the machining difficulty of the bypass channel 41, the bypass channel 41 can be positioned only close to the main mating part of the main circumferential positioning structure in the circumferential direction, without needing to be completely aligned with the main mating part in the circumferential direction. In this case, the working fluid in the intake region 40 can flow from the radially inner end to the radially outer end of the bypass channel 41, and after flowing out from the radially outer end, it reaches the gap between the outer peripheral wall 11 of the fixed scroll 10 and the annular peripheral wall 31 of the main bearing housing 30 near the main mating part, and then flows from this gap to the main mating part to lubricate it. The intake region 40 of the scroll compressor mechanism is defined inside the scroll compressor mechanism and is used to introduce the working fluid into the working chamber of the scroll compressor mechanism. The inner peripheral surface 16 of the outer peripheral wall 11 of the fixed scroll 10 includes an intake surface 17 for defining the intake region 40 and a working surface 18 for defining the working chamber, wherein the working surface 18 can tightly engage with the moving scroll blade 22 to form the working chamber. The suction region 40 can be defined between the suction surface 17 of the inner peripheral surface 16 and the portion of the moving vortex blade 22 that is opposite to the suction surface 17 in the circumferential direction. The starting position S of the suction surface 17 of the inner peripheral surface 16 is the position of the inner peripheral surface 16 in the circumferential direction corresponding to the starting end 23 of the moving vortex blade 22 (this position can be adjacent to the suction window opened on the outer peripheral wall of the fixed vortex), and the ending position T of the suction surface 17 is the position where the inner peripheral surface 16 can tightly engage with the moving vortex blade 22 (that is, the ending position T of the suction surface 17 corresponds to the starting position of the working surface 18, at the starting position of the working surface 18, the thickness of the outer peripheral wall 11 can be thinned to form a stepped portion). Preferably, the main circumferential positioning structure can be positioned at the position of the air intake surface 17 of the inner circumferential surface 16 of the outer circumferential wall 11 of the fixed vortex in the circumferential direction. That is, it is set between the starting position S and the ending position T of the air intake surface 17 in the circumferential direction, and ensures that the radial inner end of the bypass channel 41 is located between the starting position S and the ending position T of the air intake surface 17.More preferably, the main circumferential positioning structure can be positioned such that the distance between the radial inner end of the bypass channel 41 and the starting position S in the circumferential direction is greater than the distance between the radial inner end and the ending position T in the circumferential direction. This design helps ensure that the working fluid entering the intake region gains sufficient pressure before entering the bypass channel 41, thereby allowing it to flow more easily through the bypass channel 41 to the vicinity of the main mating part of the main circumferential positioning structure.

[0031] Below, refer to Figure 3 and Figure 4 This invention provides a detailed description of the working principle and advantageous technical effects of the bypass channel of the scroll compressor according to a preferred embodiment of the present invention.

[0032] In the operation of the scroll compressor according to a preferred embodiment of the present invention, the working fluid containing lubricating oil enters the interior of the scroll compressor mechanism through an intake window (not shown) opened on the outer peripheral wall of the fixed scroll, and enters the intake region of the scroll compressor mechanism. During the operation of the scroll compressor, the moving scroll rotates clockwise relative to the fixed scroll, causing the volume of the intake region of the scroll compressor mechanism to intermittently increase and decrease. During a certain period of time during the operation of the scroll compressor, the moving scroll blades move from a first position to a second position, and during this movement, the volume of the intake region decreases, resulting in an increase in the pressure in the intake region. As a result, the pressure at the radially inner end of the bypass channel, which connects to the intake area, increases and becomes greater than the pressure at the radially outer end of the bypass channel. Consequently, the working fluid carrying lubricating oil enters the bypass channel under the pressure difference between the radially inner and radially outer ends and flows from the radially inner end to the radially outer end, reaching the vicinity of the main mating part of the main circumferential positioning structure (i.e., the contact surface between the locating key and the locating keyway). This helps ensure that sufficient lubricating oil can flow to the main mating part of the main circumferential positioning structure to fully lubricate the main mating part, reduce the temperature of the main mating part, and reduce the wear of the main mating part.

[0033] As described above, in the scroll compressor according to the preferred embodiment of the present invention, sufficient lubrication of the fixed scroll of the scroll compression mechanism and the main circumferential positioning structure of the main bearing housing can be achieved through a bypass channel. Specifically, the working fluid in the suction region of the scroll compression mechanism of the scroll compressor can flow directly to the vicinity of the main mating part of the main circumferential positioning structure through the bypass channel, helping to ensure sufficient lubrication of the main mating part (i.e., the contact surface between the locating key and the locating keyway) with adequate lubricating oil, thus solving the problem of insufficient lubrication of the mating part of the circumferential positioning structure in scroll compressors of the related art. Therefore, in the scroll compressor according to the preferred embodiment of the present invention, the wear condition of the main mating part of the main circumferential positioning structure can be significantly improved, thereby reducing the risk of failure of the main circumferential positioning structure, and further improving the stability of the fit between the fixed scroll and the main bearing housing and the operational stability of the scroll compressor.

[0034] Furthermore, it should be noted that although the preferred embodiment of the vortex compression mechanism according to the present invention has been described above, it is understood that the technical solution in this embodiment is only illustrative and not restrictive. Not all features are necessary, and various feasible variations can be adopted, as specifically exemplified below.

[0035] Although in the preferred embodiment, the bypass channel is provided only near the main circumferential positioning structure, and further only near the main mating portion of the main circumferential positioning structure, the location of the bypass channel can be varied according to actual needs. For example, the bypass channel can be provided adjacent to other circumferential positioning structures besides the main circumferential positioning structure, such as the main mating portion of another circumferential positioning structure (which is composed of the sides of the positioning key and the sides of the positioning keyway that can abut against each other and can bear a large load), and / or, the bypass channel can be provided adjacent to other parts of the main circumferential positioning structure, such as the mating portion of the main circumferential positioning structure that is opposite to the main mating portion in the circumferential direction. Although in the preferred embodiment, the bypass channel is configured to extend in the radial direction, the bypass channel can also be configured to extend in a direction at an angle to the radial direction, as long as the radially inner end of the bypass channel communicates with the intake region and the radially outer end of the bypass channel is adjacent to the circumferential positioning structure.

[0036] Although the present invention has been described with reference to exemplary embodiments, it should be understood that the present invention is not limited to the specific embodiments described and shown herein, and various changes can be made to the exemplary embodiments by those skilled in the art without departing from the scope defined by the claims.

Claims

1. A scroll compressor, the scroll compressor comprising a scroll compression mechanism and a main bearing housing for supporting the scroll compression mechanism; The scroll compressor mechanism has a working chamber and an intake region for introducing working fluid into the working chamber. The vortex compression mechanism includes a fixed vortex and a moving vortex that cooperates with the fixed vortex; The fixed vortex includes an outer peripheral wall and a positioning key disposed on the outer peripheral surface of the outer peripheral wall; Furthermore, the main bearing housing includes a positioning keyway, and the positioning key and the positioning keyway cooperate with each other to form a circumferential positioning structure for positioning the fixed vortex relative to the main bearing housing in the circumferential direction; Its features are, A bypass channel extending through the outer peripheral wall is provided therein. The radially inner end of the bypass channel is connected to the intake area, while the radially outer end of the bypass channel is positioned adjacent to the circumferential positioning structure so as to guide the working fluid in the intake area to the circumferential positioning structure.

2. The scroll compressor according to claim 1, characterized in that, The main bearing housing includes an annular peripheral wall, wherein the positioning keyway is disposed on the annular peripheral wall.

3. The scroll compressor according to claim 1, characterized in that, The bypass channel extends in the radial direction.

4. The scroll compressor according to claim 1, characterized in that, The inner circumferential surface of the outer circumferential wall includes an air intake surface for defining the air intake region. The starting position of the air intake surface is the position of the inner circumferential surface corresponding to the starting end of the moving vortex blade of the moving vortex in the circumferential direction. The ending position of the air intake surface is the position where the inner circumferential surface can tightly engage with the moving vortex blade. The radial inner end of the bypass channel is located between the starting position and the ending position in the circumferential direction.

5. The scroll compressor according to claim 4, characterized in that, The distance between the radial inner end of the bypass channel and the starting position in the circumferential direction is greater than the distance between the radial inner end of the bypass channel and the ending position in the circumferential direction.

6. The scroll compressor according to claim 1, characterized in that, The scroll compressor includes a plurality of circumferential positioning structures, wherein one of the plurality of circumferential positioning structures is a primary circumferential positioning structure, and the positioning key and positioning keyway of the primary circumferential positioning structure are fitted together; and the radial outer end of the bypass channel is positioned adjacent to the primary circumferential positioning structure.

7. The scroll compressor according to claim 6, characterized in that, The circumferential positioning structures other than the main circumferential positioning structure among the multiple circumferential positioning structures are constructed as foolproof circumferential positioning structures, wherein the positioning key and positioning keyway of the foolproof circumferential positioning structure are constructed to be non-adhesive to each other to play a circumferential limiting role.

8. The scroll compressor according to any one of claims 1 to 7, characterized in that, The radial outer end of the bypass channel is positioned adjacent to the main mating part of the circumferential positioning structure. The main mating part is composed of the side of the positioning key and the side of the positioning keyway that can abut against each other, and the main mating part is capable of bearing a large load.

9. The scroll compressor according to any one of claims 1 to 7, characterized in that, During the operation of the scroll compressor, the volume of the suction region intermittently increases and decreases. When the volume of the suction region decreases, the pressure in the suction region increases, causing the pressure at the radial inner end of the bypass channel to be greater than the pressure at the radial outer end of the bypass channel. As a result, the working fluid carrying lubricating oil enters the bypass channel under the pressure difference between the radial inner end and the radial outer end and flows from the radial inner end to the radial outer end.

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