Blade structure and scroll compressor

Abstract

The utility model relates to the technical field of scroll compressors, in particular to a blade structure and a scroll compressor, the blade structure comprises a shaft barrel and at least two blades, and the at least two blades are uniformly arranged on the outer side wall of the shaft barrel around the central axis of the shaft barrel; the blades are arc-shaped plate-shaped blades or sheet-shaped blades. The scroll compressor can be installed on a crankshaft of the scroll compressor, and when the oil spitting rate of the compressor is higher than 10%, the oil spitting rate of the compressor can be reduced to an acceptable range.

Description

Technical Field

[0001] The utility model relates to the technical field of scroll compressors, and particularly to a blade structure and a scroll compressor. Background Technique

[0002] Due to the outstanding characteristics of scroll compressors in terms of quietness, high volumetric efficiency, etc., the scroll compressor industry is developing towards large displacement and large cylinder diameter, and the application scenarios are constantly expanding. After the compressor displacement and cylinder diameter increase, the oil spitting rate will increase exponentially. Since the central air-conditioning system mostly has long refrigerant pipes and high height differences, it is difficult for the air-conditioning system to return oil. After the compressor oil spitting rate increases, the refrigerant oil in the air-conditioning system remains in the pipeline with the refrigerant, the refrigerant oil inside the compressor decreases and the oil level cannot be maintained, the reliability of the compressor decreases, and the failure rate will increase greatly. How to reduce the oil spitting rate of large-displacement scroll compressors has become a common problem in the scroll compressor industry.

[0003] At present, there are two common methods in the industry to reduce the oil spitting rate. One is to weld a diversion structure at the exhaust passage of the frame to change the air flow direction, increase the rotational separation effect of the air flow, and reduce the oil spitting rate; the other is to add a partition near the lower shell to block the impact of the air flow on the oil sump of the lower shell and reduce the oil spitting rate. The effects of these two methods in reducing the oil spitting rate are limited. When the oil spitting rate is higher than 10%, these two schemes cannot effectively reduce the oil spitting rate to an acceptable range, and the industry generally requires that the oil spitting rate ≤ 3% when the rotational speed is 120 rps. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a blade structure which can be installed on the crankshaft of a scroll compressor, and when the oil spitting rate of the compressor is higher than 10%, the oil spitting rate of the compressor can be reduced to an acceptable range.

[0005] Another purpose of the utility model is to provide a scroll compressor, which can optimize the structure of the blade in the blade structure, and when installed on the crankshaft of the scroll compressor, when the oil spitting rate of the compressor is higher than 10%, the oil spitting rate of the compressor can be reduced to an acceptable range.

[0006] The technical solution of the utility model is realized as follows:

[0007] A blade structure includes a shaft cylinder and blades, and at least two of the blades are evenly arranged on the outer side wall of the shaft cylinder around the central axis of the shaft cylinder;

[0008] The blade is an arc-shaped plate-like blade or a sheet-like blade.

[0009] Further, when the blade is an arc-shaped plate blade or a sheet blade, and the blade is formed by twisting a rectangular plate or a rectangular sheet, the blade includes a blade top, a blade outer side, a blade bottom, and a blade inner side that are connected in sequence from head to tail;

[0010] Wherein, the blade inner side is correspondingly attached and connected to the outer side wall of the shaft cylinder, and the rectangular plate or the rectangular sheet is twisted to form the arc-shaped blade by respectively turning the upper and lower ends of the blade outer side by a set angle.

[0011] Further, the set angle is a, satisfying: 0° < a < 45°.

[0012] Further, the blade is an arc-shaped plate blade or a sheet blade, and the blade is a spiral blade.

[0013] Further, the number of the spiral blades is set to three, the axial direction of the shaft cylinder is the vertical direction, and from the top view angle, the three spiral blades are seamlessly connected.

[0014] Further, the outer side wall of the spiral blade includes a first arc portion, a second arc portion, a third arc portion, and a fourth arc portion that are connected in sequence from head to tail;

[0015] Wherein, the first arc portion is correspondingly attached and connected to the outer side wall of the shaft cylinder, and from the top view angle, the second arc portion and the fourth arc portion in two adjacent spiral blades are correspondingly attached.

[0016] Further, the blade and the shaft cylinder are of an integrally formed structure, or the blade and the shaft cylinder are fixedly welded.

[0017] A scroll compressor includes a housing, a stator and a rotor installed in the housing, and a crankshaft disposed in the rotor, and further includes the blade structure. The blade structure is sleeved on the crankshaft through the shaft cylinder, and when the blade structure rotates, it can generate a downward air flow.

[0018] Further, key grooves are jointly formed at the positions where the crankshaft contacts the shaft cylinder, and flat keys are installed in the key grooves.

[0019] Further, when two blades are uniformly arranged on the outer side wall of the shaft cylinder, the distance between the outermost ends of the two blades is D1, and the outer diameter of the crankshaft at the connection with the shaft cylinder is D2, satisfying: 1.5 × D2 ≤ D1 ≤ 2.5 × D2.

[0020] Compared with the prior art, the beneficial effects of the present utility model are:

[0021] The present application provides a vane structure for installation on the crankshaft of a scroll compressor. By designing the shape and structure of the vane, when the vane rotates together with the crankshaft, a downward airflow is generated, which blows the airflow towards the upper winding of the stator and the stator-rotor air gap; the mixed airflow of refrigerant and refrigerating oil passes through the gap between the copper wires of the upper winding of the stator, and the small droplets in the airflow gather to form large droplets, which converge in the groove on the outer wall of the stator and flow towards the oil sump below the stator, generating an oil-gas separation effect. The separated gas is discharged from the compressor through the exhaust pipe, achieving the effect of reducing the oil spitting rate of the airflow discharged from the exhaust pipe, and in practical applications, the effect of reducing the oil spitting rate is very significant, and the oil spitting rate of more than 10% can be reduced to less than 3%, with a reduction of more than 7%. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0023] Figure 1 Isometric view of the vane structure of Embodiment 1 of the present invention when adopting the two-eye straight vane scheme;

[0024] Figure 2 For the present invention Figure 1 Side view;

[0025] Figure 3 For the present invention Figure 1 Top view;

[0026] Figure 4 Side view of the vane structure of Embodiment 1 of the present invention when adopting the three-eye straight vane scheme;

[0027] Figure 5 For the present invention Figure 4 Top view;

[0028] Figure 6 Isometric view of the vane structure of Embodiment 2 of the present invention when adopting the three-eye curvature vane scheme with zero vane tip clearance;

[0029] Figure 7 For the present invention Figure 6 Side view;

[0030] Figure 8 For the present invention Figure 6 Top view;

[0031] Figure 9 Schematic structural diagram of the scroll compressor of Embodiment 3 of the present invention;

[0032] Figure 10 For the present utility model Figure 9 Cross-sectional view taken along line A-A in the present utility model;

[0033] Figure 11 It is a data comparison chart of the oil discharge rate when the scroll compressor adopts three blade structure schemes (such as the two-eye straight blade scheme, the three-eye straight blade scheme, and the three-eye curvature blade scheme with zero blade tip clearance) in the prior art solution and Embodiments 1-2 respectively at different motor speeds.

[0034] In the figure:

[0035] 1 - Blade structure; 2 - Shaft cylinder; 201 - Keyway; 3 - Blade;

[0036] 301 - Blade top; 302 - Blade outer part; 303 - Blade bottom; 304 - Blade inner part; 305 - First center line;

[0037] 306 - First arc part; 307 - Second arc part; 308 - Third arc part; 309 - Fourth arc part;

[0038] 5 - Upper shell; 6 - Tube shell; 7 - Lower shell; 8 - Passage; 9 - Fixed plate; 10 - Movable plate; 11 - Frame; 12 - Crankshaft; 13 - Stator; 14 - Rotor; 15 - Upper winding of stator; 16 - Lower winding of stator; 17 - Air gap between stator and rotor; 18 - Oil sump; 19 - Suction pipe; 20 - Exhaust pipe. Detailed implementation manners

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0041] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0042] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is habitually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0043] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0044] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0045] The following will describe in detail some embodiments of the present utility model with reference to the drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0046] Embodiment 1

[0047] As Figures 1 - 5 , this embodiment provides a blade structure 1, including a shaft cylinder 2 and blades 3. At least two of the blades 3 are uniformly arranged on the outer side wall of the shaft cylinder 2 around the central axis of the shaft cylinder 2;

[0048] The blade 3 is an arc-shaped plate blade or a sheet blade.

[0049] The following will introduce in detail the shape and structure of the blade 3:

[0050] When the blade 3 is an arc-shaped plate blade or a sheet blade, and the blade 3 is formed by twisting a rectangular plate or a rectangular sheet, the blade 3 includes a blade top 301, a blade outer part 302, a blade bottom 303, and a blade inner part 304 that are connected in sequence from head to tail, as Figure 1 shown.

[0051] Wherein, the inner side portion 304 of the blade is correspondingly attached and connected to the outer side wall of the shaft cylinder 2, and the rectangular plate or the rectangular piece is twisted to form the arc-shaped blade 3 after respectively bending the upper and lower end portions of the outer side portion 302 of the blade by a set angle in opposite directions.

[0052] In this embodiment, taking the arc-shaped plate-like blade 3 as an example for illustration, and the blade 3 is formed by twisting a rectangular plate. Before the blade 3 is twisted and formed, it has a rectangular plate structure, and its blade top 301, blade outer side portion 302, blade bottom 303, and blade inner side portion 304 are all planar structures. The blade inner side portion 304 therein is used to correspondingly fit and weld-fix to the outer side wall of the shaft cylinder 2, or the blade and the shaft cylinder 2 are of an integrally formed structure (such as casting forming, stamping forming, injection molding, or 3D printing forming). The height of the rectangular plate is H, and the rectangular plate has three center lines, namely the center line in the length direction, the center line in the width direction, and the center line in the thickness direction. The center line in the width direction is defined as the first center line 305, and the central axis of the shaft cylinder 2 is defined as the first axis, satisfying: the first center line 305 is perpendicular to the first axis, as Figure 1 and Figure 2 shown.

[0053] In this embodiment, the method of bending the rectangular plate into the blade 3 is: the upper and lower end portions of the outer side portion 302 of the rectangular plate are respectively bent by a set angle in opposite directions and then twisted to form the arc-shaped blade 3, which is equivalent to the upper and lower ends of the outer side portion 302 of the blade being bent by a set angle in opposite directions with the first center line 305 as the fulcrum and then formed. At this time, the formed blade 3 is as Figures 1 - 5 shown. The set angle is a, satisfying: 0° < a < 45°. The blade 3 can be integrally injection-molded, can also be formed by sheet metal bending (the bending method as described above), or can also be formed by metal stamping.

[0054] Preferably, the number of the blades 3 in this embodiment is two or three, that is, two or three blades 3 are arranged in a circumferential array around the shaft cylinder 2. In this embodiment, when the number of blades is two, the designed blade structure scheme at this time is called the two-eye straight blade scheme (such as Figures 1 - 3 ); when the number of blades is three, the designed blade structure scheme at this time is called the three-eye straight blade scheme (such as Figures 4 - 5 ).

[0055] Embodiment 2

[0056] As Figures 6 - 8 , this embodiment provides a blade structure 1, including a shaft cylinder 2 and blades 3, and at least two of the blades 3 are uniformly arranged on the outer side wall of the shaft cylinder 2 around the central axis of the shaft cylinder 2;

[0057] The blade 3 is an arc-shaped plate blade or a sheet blade.

[0058] The following is a detailed introduction to the shape and structure of the blade:

[0059] When the blade 3 is an arc-shaped plate blade and the blade 3 is a spiral blade, the number of spiral blades is set to at least two.

[0060] In this embodiment, preferably, the number of spiral blades 3 is designed to be three, and the axial direction of the shaft cylinder is the vertical direction, that is, the shaft cylinder 2 is vertically arranged. And from the top view angle, the three spiral blades are seamlessly connected. At this time, the designed blade structure scheme is called the zero blade tip clearance three-eye curvature blade scheme.

[0061] To facilitate the description of the specific shape of the spiral blade, here: the outer side wall of the spiral blade includes a first arc portion 306, a second arc portion 307, a third arc portion 308, and a fourth arc portion 309 that are sequentially connected end to end (as Figure 6 ); among them, the first arc portion 306 is correspondingly attached and connected to the outer side wall of the shaft cylinder 2, and only from the top view angle, the second arc portion 307 and the fourth arc portion 309 in two adjacent spiral blades are correspondingly attached, that is, between two adjacent spiral blades, the second arc portion 307 of the previous spiral blade and the fourth arc portion 309 of the subsequent spiral blade are correspondingly attached vertically upward (as Figure 8 ), and from the side view angle, there is a gap between the second arc portion 307 of the previous spiral blade 3 and the fourth arc portion 309 of the subsequent spiral blade (as Figure 7 ).

[0062] Embodiment 3

[0063] This embodiment provides a scroll compressor (as Figure 9 ), which includes a housing, a stator 13 and a rotor 14 installed in the housing, a crankshaft 12 arranged in the rotor 14, the stator 13, the rotor 14, a fixed disk 9, a moving disk 10, a frame 11, an oil sump 18, a suction pipe 19, and an exhaust pipe 20. It further includes the blade structure 1. The blade structure 1 is sleeved on the crankshaft 12 through the shaft cylinder 2. And when the blade structure 1 is installed on the crankshaft 12, a downward air flow can be generated when the blade structure 1 rotates. Among them, the housing includes an upper housing 5, a tube housing 6, and a lower housing 7 arranged in sequence from top to bottom. An upper stator winding 15 is arranged on the upper part of the stator 13, a lower stator winding of the stator 13 is arranged on the lower part of the stator 13, a rotor 14 is arranged inside the stator 13, and the gap between the stator 13 and the rotor 14 is the stator-rotor air gap 17. There are also four passages 8 between the stator 13 and the tube housing 6, as Figure 9 and Figure 10 .

[0064] At the positions where the crankshaft 12 contacts the shaft cylinder 2, keyways 201 are jointly provided, and flat keys are installed in the keyways 201. That is, the shaft cylinder 2 and the crankshaft 12 are installed through flat keys. Then, snap ring grooves are respectively provided on the crankshaft 12 at the top and bottom of the shaft cylinder 2, and snap rings are installed for limit fixation; alternatively, the installation is achieved by the interference fit between the crankshaft 12 and the shaft cylinder 2.

[0065] When the blade structure 1 in this embodiment adopts the two-eye straight blade scheme, the outermost distance between the two blades 3 on the shaft cylinder 2 is D1, that is, the maximum distance between the two blades 3 is D1; when the blade structure 1 as a whole is sleeved on the crankshaft 12 of the scroll compressor through the shaft cylinder 2, the outer diameter of the crankshaft 12 at the connection with the shaft cylinder 2 is D2. When 1.5×D2≤D1≤2.5×D2, when the scroll compressor drives the blade structure 1 to rotate, the effect of reducing the oil spitting rate is better.

[0066] When the blade structure 1 in this embodiment adopts the three-eye straight blade scheme, the height of the initial rectangular plate before the blade 3 is twisted and formed is H, that is, the height of the inner blade part 304 on the blade 3 is H. When the height H of the blade 3 is 1.2 - 1.6 times the outer diameter D2 of the crankshaft 12, the effect of reducing the oil spitting rate is better, that is: 1.2×D2≤H≤1.6×D2.

[0067] It should be noted that in the scroll compressor, the data tables of the actually measured oil spitting rates of the compressor according to different schemes are as Figure 11 shown, which successively show the comparison charts of the oil spitting rates of the scroll compressor when adopting the initial scheme (prior art scheme), the two-eye straight blade scheme, the three-eye straight blade scheme, and the three-eye curvature blade scheme with zero blade tip clearance, and the motor is at different speeds. According to Figure 11 the comparison chart, it can be known that:

[0068] When the motor speed in the scroll compressor is 30 rps, the oil spitting rate of the prior art scheme is 3.8%, the oil spitting rate of the two-eye straight blade scheme is 2.2%, the oil spitting rate of the three-eye straight blade scheme is 1.1%, and the oil spitting rate of the three-eye curvature blade scheme with zero blade tip clearance is 0.4%;

[0069] When the motor speed in the scroll compressor is 60 rps, the oil spitting rate of the prior art scheme is 5.7%, the oil spitting rate of the two-eye straight blade scheme is 2.4%, the oil spitting rate of the three-eye straight blade scheme is 1.6%, and the oil spitting rate of the three-eye curvature blade scheme with zero blade tip clearance is 0.8%;

[0070] When the motor speed in the scroll compressor is 90 rps, the oil spitting rate of the prior art scheme is 8.4%, the oil spitting rate of the two-eye straight blade scheme is 2.7%, the oil spitting rate of the three-eye straight blade scheme is 2.1%, and the oil spitting rate of the three-eye curvature blade scheme with zero blade tip clearance is 1.5%;

[0071] When the motor speed in the scroll compressor is 120 rps, the oil discharge rate of the existing technical solution is 11.2%, the oil discharge rate of the two-eye straight blade solution is 2.9%, the oil discharge rate of the three-eye straight blade solution is 2.4%, and the oil discharge rate of the three-eye curvature blade solution with zero blade tip clearance is 1.9%.

[0072] Among them, regardless of the motor speed, at the same motor speed, when the blade structure 1 adopts the three-eye curvature blade solution with zero blade tip clearance, the effect of reducing the oil discharge rate of the scroll compressor is the most excellent.

[0073] The beneficial effects of the technical solution of the present utility model are as follows:

[0074] The present utility model provides a blade structure 1 for reducing the oil discharge rate of a scroll compressor. The blade 3 is fixed to the crankshaft 12 by an interference fit or a flat key + snap ring limiting method. The blade 3 rotates with the crankshaft 12 to generate a downward airflow, which blows the airflow towards the upper winding 15 of the stator and the stator-rotor air gap 17; the mixed airflow of refrigerant and refrigerating oil passes through the gap between the copper wires of the upper winding 15 of the stator. Small droplets in the airflow gather to form large droplets, which converge in the groove on the outer wall of the stator 13 and flow to the oil sump 18 below the stator 13, generating an oil-gas separation effect. The separated gas is discharged from the compressor through the exhaust pipe 20, achieving the effect of reducing the oil discharge rate of the airflow discharged from the exhaust pipe 20.

[0075] The effect of reducing the oil discharge rate of the present utility model is very significant. Through multiple tests, the oil discharge rate of more than 10% can be reduced to less than 3%, with a reduction of more than 7%. Moreover, it has the advantages of compact structure and light weight. When the scroll compressor adopts the three solutions in Embodiments 1-2 (the two-eye straight blade solution, the three-eye straight blade solution, and the three-eye curvature blade solution with zero blade tip clearance), when the motor speed is below 120 rps, the oil discharge rate after adopting these three solutions does not change significantly (that is, when the motor speed is larger, the oil discharge rate does not increase significantly), taking into account the two major indicators of the oil discharge rate and energy efficiency of the scroll compressor.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.

[0077] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A blade structure (1), characterized in that: It comprises a shaft cylinder (2) and blades (3), wherein at least two blades (3) are evenly arranged on the outer side wall of the shaft cylinder (2) around the central axis of the shaft cylinder (2); The blades (3) are arc-shaped plate-like blades or sheet-like blades.

2. The blade structure (1) according to claim 1, characterized in that: When the blade (3) is an arc-shaped plate-shaped blade or a sheet-shaped blade, and the blade (3) is formed by twisting a rectangular plate or a rectangular sheet, the blade (3) comprises a blade top (301), a blade outer portion (302), a blade bottom (303) and a blade inner portion (304) which are connected in sequence end to end; The inner side portion (304) of the blade is correspondingly connected to the outer side wall of the shaft tube (2), and the rectangular plate or the rectangular sheet is twisted to form the arc-shaped blade (3) by respectively turning the upper and lower ends of the outer side portion (302) of the blade in opposite directions at a set angle.

3. The blade structure (1) according to claim 2, characterized in that: The set angle is a, which satisfies: 0°<a<45°.

4. The blade structure (1) according to claim 1, characterized in that: The blade (3) is an arc-shaped plate-shaped blade or a sheet-shaped blade, and the blade (3) is a spiral blade.

5. The blade structure (1) according to claim 4, characterized in that: The number of the spiral blades is set to three, the axial direction of the shaft cylinder (2) is a vertical direction, and from a top view, the three spiral blades are seamlessly connected.

6. The blade structure (1) according to claim 5, characterized in that: The outer side wall of the spiral blade comprises a first arc portion (306), a second arc portion (307), a third arc portion (308) and a fourth arc portion (309) which are connected in sequence end to end; The first arc portion (306) is correspondingly fitted and connected to the outer wall of the shaft tube (2), and from a top view, the second arc portion (307) and the fourth arc portion (309) of two adjacent spiral blades are correspondingly fitted.

7. The blade structure (1) according to claim 1, characterized in that: The blades (3) and the shaft cylinder (2) are an integrally formed structure, or the blades (3) and the shaft cylinder (2) are fixed by welding.

8. A scroll compressor, comprising a casing, a stator (13) and a rotor (14) installed in the casing, and a crankshaft (12) arranged in the rotor (14), characterized in that: It also comprises a blade structure (1) as claimed in any one of claims 1 to 7, wherein the blade structure (1) is sleeved on the crankshaft (12) through the shaft tube (2), and the blade structure (1) can generate a downward airflow when rotating.

9. The scroll compressor according to claim 8, characterized in that: A keyway (201) is provided at the position where the crankshaft (12) contacts the shaft cylinder (2), and a flat key is installed in the keyway (201).

10. The scroll compressor according to claim 8, characterized in that: When two blades (3) are evenly arranged on the outer side wall of the shaft cylinder (2), the distance between the outermost ends of the two blades (3) is D1, and the outer diameter of the crankshaft (12) at the connection with the shaft cylinder (2) is D2, satisfying: 1.5 × D2≤D1≤2.5 × D2.

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