Scroll compressor

Abstract

The present invention relates to a scroll compressor and its lubricating oil supply system. The lubricating oil supply system includes: an oil passage P1 formed by a central hole longitudinally penetrating through the crankshaft; an oil pump with a suction port immersed in the lubricating oil in the oil sump and a discharge port communicating with the oil passage P1; an oil passage P3 located in the gap between the upper end face of the crankshaft and the lower surface of the orbiting scroll; an oil passage P4 formed by a longitudinal hole in the crankshaft, the longitudinal hole extending downward from the upper end face of the crankshaft; an oil passage P5 formed by a transverse hole in the crankshaft and the gap between the lower edge of the hub of the orbiting scroll and the upper surface of the upper balance weight, the transverse hole extending laterally from the outer peripheral surface of the upper end of the crankshaft to communicate with the longitudinal hole, and the opening of the transverse hole on the outer peripheral surface of the upper end of the crankshaft being aligned with the gap between the lower edge of the hub and the upper surface of the upper balance weight; an oil passage P6 formed by the gap between the outer peripheral surface of the hub and the vertical wall of the upper balance weight and the gap between the outer peripheral surface of the hub and the inner peripheral surface of the central hole of the frame; and an oil passage P2 formed by a return oil pipe for the lubricating oil to circulate.

Description

Technical Field

[0001] The present invention relates to a scroll compressor, in particular to a lubricating oil supply system suitable for a scroll compressor. Background Art

[0002] The orbiting scroll of a scroll compressor is supported axially by a fixed frame. During the operation of the scroll compressor, the friction pair formed between the frame and the orbiting scroll continuously rubs against each other. Therefore, there is a risk of wear on the thrust surface, which may ultimately lead to a reduction in the performance of the scroll compressor or even failure.

[0003] At present, there are few designs for the lubricating oil supply system of scroll compressors on the market that can provide a stable oil supply and fully lubricate the thrust surface, so it is impossible to effectively prevent the wear of the thrust surface when the scroll compressor operates at high speed. Summary of the Invention

[0004]

Technical Problem

[0005] The present invention is made to solve the above technical problems and potential other technical problems.

[0006]

Technical Solution

[0007] The general idea of the technical solution of the present invention is: designing a lubricating oil supply channel on the crankshaft, combined with a special upper balance weight design, to transport the lubricating oil in the oil sump at the bottom of the scroll compressor to between the frame and the thrust surface of the orbiting scroll. By adopting this design, the friction pair of the thrust surface can be effectively lubricated, ensuring the reliability of the long-term operation of the compressor. Specifically, by specially designing the linear shape of the upper balance weight, the lubricating oil can reach the thrust surface of the frame through the wall surface of the upper balance weight by means of centrifugal force. During the high-speed operation of the scroll compressor, these lubricating oils can effectively prevent the wear of the thrust surface and improve the reliability of the scroll compressor.

[0008] The present invention provides a scroll compressor, which includes:

[0009] - A housing, in which an oil sump for storing lubricating oil is formed at the bottom;

[0010] - A scroll assembly, which is arranged in the housing, and the scroll assembly includes:

[0011] A stationary scroll, which is fixed in the housing,

[0012] An orbiting scroll, which is arranged below the stationary scroll and cooperates with the stationary scroll to form a compression chamber, and

[0013] A frame, which is fixed inside the housing and supports the moving scroll disk below the moving scroll disk, thereby forming a friction pair between the lower surface of the moving scroll disk and the upper surface of the frame; and

[0014] - A drive assembly, including:

[0015] An electric motor,

[0016] A crankshaft, which can be driven by the electric motor to rotate. The upper end of the crankshaft is cylindrical and inserted into the central hole of the hub at the bottom of the moving scroll disk to drive the moving scroll disk to revolve, and

[0017] An upper balance weight, which is arranged at the upper end of the crankshaft and rotates together with the crankshaft. The upper balance weight has an upper surface and a vertical wall extending upward from the upper surface. The vertical wall is generally a part of a cylindrical body. The hub of the moving scroll disk is inserted into the gap between the outer peripheral surface of the upper end of the crankshaft and the inner wall surface of the vertical wall.

[0018] The scroll compressor further includes a lubricating oil supply system, and the lubricating oil supply system includes:

[0019] An oil passage P1, which is formed by generally longitudinally penetrating the central hole of the crankshaft;

[0020] An oil pump, which is installed at the lower end of the crankshaft. Wherein, the oil suction port at the lower end of the oil pump is immersed in the lubricating oil in the oil sump, and the oil outlet at the upper end of the oil pump is communicated with the oil passage P1;

[0021] An oil passage P3, which is located in the gap between the upper end surface of the crankshaft and the lower surface of the moving scroll disk;

[0022] An oil passage P4, which is formed by a longitudinal hole in the crankshaft. The longitudinal hole extends downward from the upper end surface of the crankshaft;

[0023] An oil passage P5, which is formed by a transverse hole in the crankshaft and the gap between the lower edge of the hub of the moving scroll disk and the upper surface of the upper balance weight. Wherein, the transverse hole extends horizontally from the outer peripheral surface of the upper end of the crankshaft to communicate with the longitudinal hole, and the opening of the transverse hole on the outer peripheral surface of the upper end of the crankshaft is aligned with the gap between the lower edge of the hub of the moving scroll disk and the upper surface of the upper balance weight;

[0024] An oil passage P6, which is formed by the gap between the outer peripheral surface of the hub of the moving scroll disk and the inner wall surface of the vertical wall, and the gap between the outer peripheral surface of the hub of the moving scroll disk and the inner peripheral surface of the central hole of the frame; and

[0025] The oil circuit P2 is formed by an oil return pipe. The upper end opening of the oil return pipe is located at the bottom of the frame, and the lower end opening of the oil return pipe leads to the oil sump, so that the lubricating oil circulates along the following route:

[0026]

[0027] Optionally, the inner wall surface of the vertical wall includes a first arc section and a second arc section. When looking down at the drive assembly, the rotation center of the crankshaft, the center of the upper end of the crankshaft, and the center of the first arc section are collinear. The center of the upper end of the crankshaft and the center of the first arc section are located on both sides of the rotation center of the crankshaft, and the second arc section is centered on the center of the upper end of the crankshaft. When referring to the rotation direction of the crankshaft, the first arc section is located on the upstream side of the second arc section, so that the radius r1 of the first arc section, the distance r from the upstream end of the first arc section to the rotation center of the crankshaft A 、the distance r from the downstream end of the first arc section to the rotation center of the crankshaft B 、the distance d from the upstream end of the second arc section to the center of the first arc section satisfy the following relationship: r1 > d and r B >r A . The opening of the transverse hole on the outer peripheral surface of the upper end of the crankshaft faces the upstream end of the first arc section.

[0028] Optionally, when looking down at the drive assembly, the inner wall surface of the vertical wall is generally semi-circular. The rotation center O1 of the crankshaft, the center (O2) of the upper end of the crankshaft, and the center (O3) of the inner wall surface are collinear, and the center (O2) of the upper end of the crankshaft and the center (O3) of the inner wall surface are located on both sides of the rotation center O1 of the crankshaft, so that when referring to the rotation direction (RD) of the crankshaft, the distance r from the upstream end point A of the inner wall surface to the rotation center O1 of the crankshaft A 、the distance r from any point B on the downstream side of the upstream end point A on the inner wall surface to the rotation center O1 of the crankshaft B satisfy the following relationship: within the range of ∠AO1B < 90°, r B >r A . The opening of the transverse hole on the outer peripheral surface of the upper end of the crankshaft faces the upstream end point A of the inner wall surface.

[0029] Preferably, a chamfer is formed at the ridge line where the inner peripheral surface of the central hole of the frame intersects the upper surface of the frame.

[0030] Preferably, an oil return hole is provided on the upper surface of the frame so that the lubricating oil at the friction pair flows towards the upper end opening of the oil return pipe through the oil return hole.

[0031] Preferably, the generatrix of the inner wall surface of the vertical wall is inclined relative to the vertical direction, such that the distance from the lower end of the generatrix to the rotation axis is less than the distance from the upper end of the generatrix to the rotation axis.

[0032]

Technical effects

[0033] The scroll compressor and its lubricating oil supply system provided by the present invention have a simple structure and good oil supply effect, and can effectively prevent the wear of the thrust surface when the scroll compressor operates at high speed, so it is suitable for engineering applications. Brief description of the drawings

[0034] To facilitate the understanding of the present invention, the present invention will be described in more detail below based on exemplary embodiments in conjunction with the drawings. The same or similar reference numerals are used to represent the same or similar components in the drawings. It should be understood that the drawings are only schematic, and the dimensions and proportions of the components in the drawings are not necessarily accurate.

[0035] Figure 1 is a longitudinal sectional view of a scroll compressor according to an exemplary embodiment of the present invention.

[0036] Figure 2A is a partial longitudinal sectional view of a scroll compressor according to an exemplary embodiment of the present invention.

[0037] Figure 2B is a schematic diagram of the lubricating oil flow path of a scroll compressor according to an exemplary embodiment of the present invention.

[0038] Figure 3 is a perspective view of the frame of a scroll compressor according to an exemplary embodiment of the present invention.

[0039] Figure 4 is a perspective view of the crankshaft and the upper balance weight assembly of a scroll compressor according to an exemplary embodiment of the present invention.

[0040] Figure 5 is Figure 4 a top view of the crankshaft and the upper balance weight assembly in

[0041] Figure 6 is a top view of the crankshaft and the upper balance weight assembly of a scroll compressor according to another exemplary embodiment of the present invention. Detailed description of the embodiments

[0042] The present invention will be described in detail below with reference to the drawings.

[0043] Figure 1is a longitudinal sectional view of a scroll compressor according to an exemplary embodiment of the present invention. Figure 2A is a partial longitudinal sectional view of a scroll compressor according to an exemplary embodiment of the present invention. Figure 2B is a schematic diagram of a lubricating oil flow path of a scroll compressor according to an exemplary embodiment of the present invention.

[0044] As Figure 1 shown, a scroll compressor 1 according to an exemplary embodiment of the present invention includes a housing 11, a scroll assembly 12, and a drive assembly 13. An oil sump 11-1 for storing lubricating oil is formed at the bottom of the housing 11. The scroll assembly 12 is disposed within the housing 11. The scroll assembly 12 includes an orbiting scroll 12-1, a stationary scroll 12-2, and a frame 12-3. The stationary scroll 12-2 is fixed within the housing 11. The orbiting scroll 12-1 is disposed below the stationary scroll 12-2 and cooperates with the stationary scroll 12-2 to form a compression chamber 12-12. The frame 12-3 is fixed within the housing 11 and supports the orbiting scroll 12-1 below the orbiting scroll 12-1, thereby forming a friction pair 12-13 between the lower surface of the orbiting scroll 12-1 and the upper surface of the frame 12-3. The drive assembly 13 includes a motor 13-1, a crankshaft 13-2, and an upper balance weight 13-3. The crankshaft 13-2 can be driven by the motor 13-1 to rotate. The upper end of the crankshaft 13-2 is cylindrical and inserted into a central hole of a hub 12-1-1 at the bottom of the orbiting scroll 12-1 to drive the orbiting scroll 12-1 to revolve. The upper balance weight 13-3 is disposed at the upper end of the crankshaft 13-2 and rotates together with the crankshaft 13-2.

[0045] Figure 4 is a perspective view of a crankshaft 13-2 and an upper balance weight 13-3 assembly of a scroll compressor 1 according to an exemplary embodiment of the present invention.

[0046] As Figure 4 shown, the upper balance weight 13-3 has an upper surface 13-3-2 and a standing wall 13-3-1 extending upward from the upper surface 13-3-2. The standing wall 13-3-1 is generally a part of a cylindrical body. The hub 12-1-1 of the orbiting scroll 12-1 is inserted into a gap between an outer peripheral surface of the upper end of the crankshaft 13-2 and an inner wall surface 13-3-1-2 of the standing wall 13-3-1.

[0047] As Figures 1 to 2B 、 Figure 4 shown, the scroll compressor 1 further includes a lubricating oil supply system 14. The lubricating oil supply system 14 includes an oil passage P1, an oil passage P2, an oil passage P3, an oil passage P4, an oil passage P5, an oil passage P6, an oil pump 14-1, etc. An oil passage P1 is formed by generally longitudinally penetrating a central hole 13-2-1 of the crankshaft 13-2. Although in Figure 2A and Figure 2BIn [it], the oil passage P1 is actually invisible. However, for a clearer description, in Figure 2A and Figure 2B the position where the oil passage P1 (i.e., the central hole 13-2-1 of the crankshaft 13-2) is located is shown by a dashed line. The oil pump 14-1 is installed at the lower end of the crankshaft. Among them, the oil suction port at the lower end of the oil pump 14-1 is immersed in the lubricating oil in the oil sump 11-1, and the oil outlet at the upper end of the oil pump 14-1 is communicated with the oil passage P1. The oil passage P3 is located in the gap between the upper end surface 13-2-2 of the crankshaft 13-2 and the lower surface of the moving scroll 12-1. The oil passage P4 is formed by the longitudinal hole 13-2-3 in the crankshaft 13-2. The longitudinal hole 13-2-3 extends downward from the upper end surface 13-2-2 of the crankshaft 13-2. The oil passage P5 is formed by the transverse hole 13-2-4 in the crankshaft 13-2 and the gap between the lower edge of the hub 12-1-1 of the moving scroll 12-1 and the upper surface 13-3-2 of the upper balance weight 13-3. The transverse hole 13-2-4 extends horizontally from the outer peripheral surface at the upper end of the crankshaft 13-2 to communicate with the longitudinal hole 13-2-3. The opening of the transverse hole 13-2-4 on the outer peripheral surface at the upper end of the crankshaft 13-2 is aligned with the gap between the lower edge of the hub 12-1-1 of the moving scroll 12-1 and the upper surface 13-3-2 of the upper balance weight 13-3. The oil passage P6 is formed by the gap between the outer peripheral surface of the hub 12-1-1 of the moving scroll 12-1 and the inner wall surface 13-3-1-2 of the vertical wall 13-3-1, and the gap between the outer peripheral surface of the hub 12-1-1 of the moving scroll 12-1 and the inner peripheral surface of the central hole 12-3-2 of the frame 12-3. The oil passage P2 is formed by the oil return pipe 14-2. The upper end opening of the oil return pipe 14-2 is located at the bottom of the frame 12-3, and the lower end opening of the oil return pipe 14-2 leads to the oil sump 11-1, so that the lubricating oil circulates along the following route:

[0048]

[0049] Figure 3 is a perspective view of the frame of a scroll compressor according to an exemplary embodiment of the present invention.

[0050] As Figures 2A to 3 shown, preferably, a chamfer 12-3-1 is formed at the edge line where the inner peripheral surface of the central hole 12-3-2 of the frame 12-3 intersects the upper surface of the frame 12-3. By forming the chamfer 12-3-1, it helps the lubricating oil to flow smoothly along the oil passage P6 to the friction pair 12-13 between the lower surface of the moving scroll 12-1 and the upper surface of the frame 12-3, so as to lubricate the thrust surface forming the friction pair 12-13. In addition, as Figure 2B and Figure 3As shown, preferably, at least one oil return hole 12-3-3 is provided on the upper surface of the frame 12-3, so that the lubricating oil at the friction pair 12-13 flows through the oil return hole 12-3-3 towards the upper end opening of the oil return pipe 14-2.

[0051] Figure 5 is Figure 4 a top view of the crankshaft 13-2 and the upper balance weight 13-3 assembly in

[0052] As Figure 4 and Figure 5 shown, the inner wall surface 13-3-1-2 of the vertical wall 13-3-1 includes a first arc section 13-3-1-2-1 (i.e., Figure 5 the arc section in ) and a second arc section 13-3-1-2-2 (i.e., Figure 5 the arc section in ). As Figure 5 shown, when looking down at the drive assembly 13, the rotation center O1 of the crankshaft 13-2, the center O2 of the upper end of the crankshaft 13-2, and the center O3 of the first arc section 13-3-1-2-1 are collinear. The center O2 of the upper end of the crankshaft 13-2 and the center O3 of the first arc section 13-3-1-2-1 are located on both sides of the rotation center O1 of the crankshaft 13-2, and the second arc section 13-3-1-2-2 is centered on the center O2 of the upper end of the crankshaft 13-2.

[0053] By appropriately setting the size of parameters such as the radius r2 of the second arc section 13-3-1-2-2, the following objectives can be achieved: when referring to the rotation direction RD of the crankshaft 13-2, the first arc section 13-3-1-2-1 is located on the upstream side of the second arc section 13-3-1-2-2, so that the radius r1 of the first arc section 13-3-1-2-1, the distance r A from the upstream end A of the first arc section 13-3-1-2-1 to the rotation center O1 of the crankshaft, the distance r B from the downstream end B of the first arc section 13-3-1-2-1 to the rotation center O1 of the crankshaft, and the distance d from the upstream end C of the second arc section 13-3-1-2-2 to the center O3 of the first arc section 13-3-1-2-1 satisfy the following relationship: r1 > d and r B > r A . In this way, it can be ensured that the downstream end B of the first arc section 13-3-1-2-1 is radially more outward than the upstream end C of the second arc section 13-3-1-2-2, so that an oil storage tank is formed by the first arc section 13-3-1-2-1, which is beneficial to the residence of the lubricating oil in the oil storage tank.

[0054] In addition, the opening of the transverse hole 13-2-4 on the outer peripheral surface of the upper end of the crankshaft 13-2 faces the upstream end A of the first arc section. Figure 5 In the figure, the transverse hole 13-2-4 is actually not visible, but for the sake of clarity, it is shown in Figure 5 The dotted line in the figure shows the position of the transverse hole 13-2-4. It has been verified by experiments that by adopting such a structure, the lubricating oil can reach the top surface 13-3-1-1 of the vertical wall 13-3-1 of the upper balancing block 13-3 by means of the inner wall surface 13-3-1-2 of the vertical wall 13-3-1 of the upper balancing block 13-3 and the centrifugal force, and finally reach the friction pair 12-13 between the lower surface of the movable scroll 12-1 and the upper surface of the frame 12-3, so as to lubricate the thrust surface forming the friction pair 12-13.

[0055] Figure 6 is a top view of a crankshaft and an upper balancing mass assembly of a scroll compressor according to another exemplary embodiment of the present invention.

[0056] like Figure 6 As shown, when looking down at the drive assembly 13, the inner wall surface 13-3-1-2' (i.e. Figure 6 The arc segment in ) is generally in the shape of a semicircle. The rotation center O1 of the crankshaft 13-2, the center O2 of the upper end of the crankshaft 13-2 and the center O3 of the inner wall surface 13-3-1-2' are collinear. The center O2 of the upper end of the crankshaft 13-2 and the center O3 of the inner wall surface 13-3-1-2' are located on both sides of the rotation center O1 of the crankshaft 13-2, so that when referring to the rotation direction RD of the crankshaft 13-2, the distance r from the upstream end point A of the inner wall surface 13-3-1-2' to the rotation center O1 of the crankshaft 13-2 is A , the distance r from any point B on the inner wall surface 13-3-1-2' located on the downstream side of the upstream end point A to the rotation center O1 of the crankshaft 13-2 B Satisfies the following relationship: In the range of ∠AO1B<90°, r B >r A In addition, Figure 5 Similarly to the case shown, the opening of the transverse hole 13-2-4 on the outer peripheral surface of the upper end of the crankshaft 13-2 faces the upstream end point A of the inner wall surface. By adopting such a structure, the effect of promoting the smooth flow of lubricating oil to the friction pair 12-13 can also be achieved.

[0057] Optionally, in the above exemplary embodiment, the generatrices of the inner wall surfaces 13-3-1-2 and 13-3-1-2' of the vertical wall 13-3-1 of the upper balance weight 13-3 may be slightly inclined relative to the vertical direction, such that the distance from the lower end of the generatrix to the rotation axis is less than the distance from the upper end of the generatrix to the rotation axis, thereby increasing the smoothness of oil discharge.

[0058] Although the technical objectives, technical solutions, and technical effects of the present invention have been described in detail above with reference to specific embodiments, it should be understood that the above embodiments are merely exemplary and not restrictive. Any modifications, equivalent replacements, and improvements made by those skilled in the art within the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A scroll compressor (1), comprising: A housing (11), in which an oil sump (11-1) for storing lubricating oil is formed at the bottom of the housing; A scroll assembly (12), which is disposed within the housing, and the scroll assembly includes: A stationary scroll plate (12-2), which is fixed within the housing, A moving scroll plate (12-1), which is disposed below the stationary scroll plate and cooperates with the stationary scroll plate to form a compression chamber (12-12), and A frame (12-3), which is fixed within the housing and supports the moving scroll plate below the moving scroll plate, thereby forming a friction pair (12-13) between the lower surface of the moving scroll plate and the upper surface of the frame; and A drive assembly (13), including: An electric motor (13-1), A crankshaft (13-2), which can be driven by the electric motor to rotate, the upper end of the crankshaft is cylindrical and inserted into the central hole of a hub (12-1-1) at the bottom of the moving scroll plate to drive the moving scroll plate to revolve, and An upper balance weight (13-3), which is disposed at the upper end of the crankshaft and rotates together with the crankshaft, the upper balance weight has an upper surface (13-3-2) and a vertical wall (13-3-1) extending upward from the upper surface, the vertical wall is generally a part of a cylindrical body, and the hub (12-1-1) of the moving scroll plate is inserted into the gap between the outer peripheral surface of the upper end of the crankshaft and the inner wall surface (13-3-1-2) of the vertical wall; Wherein, the scroll compressor further includes a lubricating oil supply system (14), and the lubricating oil supply system includes: An oil passage P1, which is formed by generally longitudinally penetrating through a central hole (13-2-1) of the crankshaft; An oil pump (14-1), which is installed at the lower end of the crankshaft, wherein the oil suction port at the lower end of the oil pump is immersed in the lubricating oil in the oil sump, and the oil outlet at the upper end of the oil pump is communicated with the oil passage P1; An oil passage P3, which is located in the gap between the upper end surface (13-2-2) of the crankshaft and the lower surface of the moving scroll plate; An oil passage P4, which is formed by a longitudinal hole (13-2-3) in the crankshaft, and the longitudinal hole extends downward from the upper end surface of the crankshaft; An oil passage P5, which is formed by a transverse hole (13-2-4) in the crankshaft and the gap between the lower edge of the hub (12-1-1) of the moving scroll plate and the upper surface (13-3-2) of the upper balance weight, wherein the transverse hole (13-2-4) extends transversely from the outer peripheral surface of the upper end of the crankshaft to communicate with the longitudinal hole (13-2-3), and the opening of the transverse hole on the outer peripheral surface of the upper end of the crankshaft is aligned with the gap between the lower edge of the hub (12-1-1) of the moving scroll plate and the upper surface (13-3-2) of the upper balance weight; The oil passage P6 is formed by the gap between the outer peripheral surface of the hub (12-1-1) of the moving scroll plate and the inner wall surface (13-3-1-2) of the vertical wall, and the gap between the outer peripheral surface of the hub (12-1-1) of the moving scroll plate and the inner peripheral surface of the central hole (12-3-2) of the frame (12-3); and The oil passage P2 is formed by the oil return pipe (14-2). The upper end opening of the oil return pipe is located at the bottom of the frame (12-3), and the lower end opening of the oil return pipe leads to the oil sump (11-1), so that the lubricating oil circulates along the following route:

2. The scroll compressor (1) according to claim 1, wherein, The inner wall surface (13-3-1-2) of the vertical wall (13-3-1) includes a first arc section (13-3-1-2-1) and a second arc section (13-3-1-2-2), When looking down at the drive assembly (13), the rotation center (O1) of the crankshaft, the center of the upper end of the crankshaft (O2), and the center of the first arc section (13-3-1-2-1) (O3) are collinear. The center of the upper end of the crankshaft (O2) and the center of the first arc section (13-3-1-2-1) (O3) are located on both sides of the rotation center (O1) of the crankshaft, and the second arc section (13-3-1-2-2) is centered on the center of the upper end of the crankshaft (O2), When referring to the rotation direction (RD) of the crankshaft, the first arc section (13-3-1-2-1) is located on the upstream side of the second arc section (13-3-1-2-2), such that the radius r1 of the first arc section, the distance r from the upstream end (A) of the first arc section to the rotation center (O1) of the crankshaft A and the distance r from the downstream end (B) of the first arc section to the rotation center (O1) of the crankshaft B and the distance d from the upstream end (C) of the second arc section to the center of the circle (O3) of the first arc section satisfy the following relationship: r1 > d and r B > r A and The opening of the transverse hole (13-2-4) on the outer peripheral surface of the upper end of the crankshaft faces the upstream end (A) of the first arc section.

3. The scroll compressor (1) according to claim 1, wherein, When looking down at the drive assembly (13), the inner wall surface (13-3-1-2’) of the vertical wall (13-3-1) is generally semi-circular; the rotation center O1 of the crankshaft, the center of the circle (O2) at the upper end of the crankshaft, and the center of the circle (O3) of the inner wall surface are collinear, and the center of the circle (O2) at the upper end of the crankshaft and the center of the circle (O3) of the inner wall surface are located on both sides of the rotation center O1 of the crankshaft, such that when referring to the rotation direction (RD) of the crankshaft, the distance r from the upstream end point A of the inner wall surface to the rotation center O1 of the crankshaft A , the distance r from any point B on the inner wall surface on the downstream side of the upstream end point A to the rotation center O1 of the crankshaft B satisfies the following relationship: within the range of ∠AO1B < 90°, r B > r A , and The opening of the transverse hole (13-2-4) on the outer peripheral surface of the upper end of the crankshaft faces the upstream end point A of the inner wall surface.

4. The scroll compressor (1) according to claim 1, wherein, A chamfer (12-3-1) is formed at the edge line where the inner peripheral surface of the central hole (12-3-2) of the frame (12-3) intersects the upper surface of the frame.

5. The scroll compressor (1) according to claim 1, wherein, An oil return hole (12-3-3) is provided on the upper surface of the frame (12-3) so that the lubricating oil at the friction pair (12-13) flows through the oil return hole to the upper end opening of the oil return pipe (14-2).

6. The scroll compressor (1) according to any one of claims 1 to 5, wherein, The generatrix of the inner wall surface of the vertical wall (13-3-1) is inclined relative to the vertical direction, such that the distance from the lower end of the generatrix to the rotation axis is less than the distance from the upper end of the generatrix to the rotation axis.

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