WO2019134364A1

WO2019134364A1 - Compressor crankshaft and compressor having same

Info

Publication number: WO2019134364A1
Application number: PCT/CN2018/098920
Authority: WO
Inventors: 沈冠廷; 李修彣; 张家彬
Original assignee: 瑞智精密股份有限公司
Priority date: 2018-01-08
Filing date: 2018-08-06
Publication date: 2019-07-11
Also published as: CN207673544U

Abstract

A compressor crankshaft (1) and a compressor (2) having the same, wherein the crankshaft (1) comprises: a shaft body (11); an eccentric portion (12), which is formed at an appropriate distance from a lower end of the shaft body (11), wherein the eccentric portion (12) is provided with at least one longitudinally-extending oil groove region (124) and at least one oil storage region (125) extending in the lateral direction and located around the oil groove region (124); and an oil inlet passage (13), which penetrates the inside of the shaft body (11) and the eccentric portion (12) along the axis of the shaft body (11); the eccentric portion (12) and a ring (232) in a cylinder (231) of a compression pump (23) fully rotationally fit together; the oil groove region (124) and the oil storage region (125) of the eccentric portion (12) effectively reduce the contact area between the eccentric portion (12) and the ring (232), thereby reducing the friction load and improving the sealing performance of oil.

Description

Crankshaft for compressor and compressor having the same

Technical field

The utility model relates to the technical field of compressors, in particular to a crankshaft for a compressor and a compressor therewith.

Background technique

With the continuous development of the industry, the technology of the closed compressor has also been continuously improved, and the compressor as the core of the system technology has also been widely used. Only by continuously improving and improving the performance of the compressor can we adapt to the rapid development of the industry.

The existing compressor includes a casing, an upper casing cover, a lower casing cover, a stator, a rotor, an upper support, a lower support, a cylinder, a ring, a crankshaft, an intake pipe, a blade and a filter bottle; wherein, the casing and the casing The upper cover and the bottom case constitute a compressor casing; the stator and the rotor constitute a motor-driven mechanism; the upper support, the lower support, the cylinder, the ring, the crankshaft and the blade constitute a pump body, and the crankshaft is disposed at the center of the rotor; The crankshaft is rotated at a high speed under the support of the upper support and the lower support, so that the pump body compresses the refrigerant gas to produce a compression effect, and the eccentric wheel of the crankshaft is provided with an oil hole on the circumference thereof, and the eccentric wheel and the ring are rotated for the whole circumference, Avoiding the wear of each other requires the use of refrigeration oil for lubrication, so that the compressor is in operation.

However, the operation of the compressor is mainly driven by the crankshaft of the motor, the pump body compression build pressure generating gases, the eccentric ring current with rotation of the crankshaft for the whole circumference, causing eccentric ring contact each other with a large area, resulting in compressor In the case of operation, the eccentric wheel and the ring generate excessive frictional force with each other, which in turn affects problems such as high power consumption of the compressor and doubts about reliability, and is improved.

Summary of the invention

Therefore, the object of the present invention is to provide a crankshaft for a compressor and a compressor having the same, which reduces the frictional force and improves the sealing performance of the oil during use, thereby prolonging the service life of the crankshaft.

The utility model provides a crankshaft for a compressor, which comprises:

a shaft body formed by extending an appropriate length along an axis;

An eccentric portion formed at an appropriate distance from the line of the lower end of the shaft body, enabling the shaft section defining an upper shaft and a lower shaft section; the eccentric portion of the region provided with at least one oil groove is formed extending in the longitudinal direction; and at least An oil storage zone extending in a lateral direction and located around the oil groove zone; and

An oil inlet passage extends through the upper and lower shaft sections of the shaft body and the inner portion of the eccentric portion along the axis.

Preferably, the eccentric portion has an eccentric wheel defining an eccentric amount surface and a non-eccentric amount surface, and the oil groove region and the oil storage region are located at the non-eccentric amount surface; Located above the eccentric and adjacent to the upper shaft segment of the shaft, defining an eccentric amount surface and a non-eccentric amount surface; and a lower thrust end located below the eccentric adjacent to At the lower shaft section of the shaft body, it defines an eccentric amount surface and a non-eccentric amount surface.

Preferably, the eccentric portion has two eccentric wheels, each defining an eccentric amount surface and a non-eccentric amount surface, the two eccentric wheels are arranged at an appropriate interval and arranged in a reverse direction, and each of the oil groove regions and each The oil storage zone is located at the non-eccentric amount surface; a connecting section is located between the two eccentric wheels; and an upper thrust end is located above the one of the eccentric wheels and adjacent to the upper axis of the shaft body a segment defining an eccentric amount surface and a non-eccentric amount surface; and a lower thrust end located below the other eccentric wheel adjacent to the lower shaft portion of the shaft body, defining an eccentric amount Face and a non-eccentric face.

Preferably, each of the oil groove regions has a groove extending from a top end of each of the eccentric wheels to a bottom end; and an oil drain hole is disposed at the groove to be in communication with the oil inlet passage .

Preferably, the overall contour of each of the oil storage zones is in the shape of a groove, and the number thereof is represented by any one of a single track or a plurality of tracks.

Preferably, each of the oil storage zones has a height less than the height of the eccentric.

Preferably, each of the oil storage zones has a width defined by an angle between two virtual straight lines extending from a central axis of each of the eccentric wheels.

Preferably, the outer peripheral wall of the upper shaft portion of the shaft body is provided with an annular groove circumferentially surrounding and located above the upper thrust end; and an edge along the outer peripheral wall of the lower shaft portion of the shaft body Surrounded circumferentially and below the annular groove below the lower thrust end.

Preferably, the upper annular groove and the outer peripheral wall of the lower annular groove each have an oil drain hole communicating with the oil inlet passage.

The utility model also provides a compressor, comprising: an outer casing, an oil storage tank is arranged at a lower portion thereof; a motor is disposed in the outer casing; a compression pump is disposed in the outer casing, and the compression pump comprises at least a cylinder and at least one ring, each of the rings being rotatably disposed in each of the cylinders, the ring being connected to the motor through a crankshaft; an upper support being disposed in the outer casing; and a lower support Provided in the outer casing, each of the cylinder system is disposed between the upper support and the lower support, and the upper support and the lower support are used to support each of the cylinder and the crankshaft;

This crankshaft is the above-described crankshaft for a compressor.

The utility model has the beneficial effects that when the crankshaft is used, when the compression pump is in operation, the upper support and the lower support are supported by the upper shaft section and the lower shaft section of the shaft body of the crankshaft. High-speed operation, which is mainly engaged by the eccentric portion of the crankshaft and the ring in the cylinder of the compression pump as a full-circle rotation fit, and the oil groove region and the oil storage region adjacent to the non-eccentric amount surface of the eccentric portion are adjacent The flow resistance of the oil can be reduced, and the refrigerating machine oil discharged from the oil groove area flows to the oil storage area to achieve the storage effect, and on the other hand, the eccentric portion of the crankshaft can be continuously contacted with the ring in the cylinder body. The refrigerating machine oil is supplemented so that the thickness of the oil film on the contact surface of the eccentric portion of the crankshaft and the ring in the cylinder is maintained and the oil seal of the eccentric is increased, thereby maintaining an ideal lubrication state and reducing the eccentric portion of the crankshaft. The heat generated between the ring and the ring in the cylinder; in addition, the contact area between the eccentric portion and the ring can be reduced as a whole, thereby reducing the friction load and improving the sealing effect of the oil, and reducing the compression pump High pressure itself The leakage of the refrigerant causes the compressor to reduce the power consumption and improve the refrigeration capacity, thereby improving the overall performance of the compressor; thereby providing a cooling effect of the crankshaft during use and improving the sealing performance of the oil. In order to extend the service life of the crankshaft.

DRAWINGS

Fig. 1 is a perspective view (1) of a crankshaft for a compressor of the present invention.

2 is a front view (1) of a crankshaft for a compressor of the present invention.

Figure 3 is a partial enlarged view of another embodiment of Figure 2 of the present invention.

Fig. 4 is a perspective view (2) of a crankshaft for a compressor of the present invention.

Fig. 5 is a front elevational view (1) of a crankshaft for a compressor of the present invention.

Figure 6 is a partial enlarged view of another embodiment of Figure 5 of the present invention.

Fig. 7 is a schematic cross-sectional view showing an eccentric portion of a crankshaft for a compressor of the present invention.

Figure 8 is a schematic view showing the structure of the compressor of the present invention.

Figure 9 is a partial enlarged view of the portion A indicated in Figure 8.

Among them: 1 crankshaft; 11 shaft body; 111 upper shaft section; 1111 upper annular groove; 11111 oil drain hole; 112 lower shaft section; 1121 lower annular groove; 11211 oil drain hole; 12 eccentric portion; 121 eccentric wheel; Eccentric surface; 1212 non-eccentric surface; 122 upper thrust end; 1221 eccentric surface; 1222 non-eccentric surface; 123 lower thrust end; 1231 eccentric surface; 1232 non-eccentric surface; 124 oil groove area; Groove; 1242 oil drain; 125 oil storage zone; 126 connecting section; 13 oil inlet passage; 2 compressor; 20 crankshaft; 21 casing; 210 oil storage tank; 22 motor; 221 stator; 222 rotor; 23 compression pump; Cylinder; 232 ring; 24 upper support; 25 lower support; 26 discharge pipe; 27 suction pipe; 3 reservoir; D distance; H1 height; H2 height; L axis; L1 central axis; L2 virtual straight line; L3 Virtual straight line; angle θ.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described below in conjunction with the accompanying drawings, and will be described in detail in the form of the embodiments. It is only for the purpose of indicating and supporting the manual. It is not necessarily the true proportion and precise configuration after the implementation of the utility model. Therefore, the proportion of the attached drawings and the configuration relationship should not be interpreted and the scope of power of the utility model in actual implementation should be limited.

The advantages, features, and technical methods of the present invention will be more readily understood by referring to the exemplary embodiments and the accompanying drawings, and the present invention may be implemented in various forms and should not be understood The present invention is intended to be limited to the scope of the invention, and the scope of the present invention will be more fully and fully conveyed. It will only be defined by the scope of the appended patent application.

First, referring to FIG. 1 to FIG. 7, the crankshaft for a compressor of the present invention includes a shaft body 11, an eccentric portion 12 and an oil inlet passage 13; wherein:

The shaft body 11 is formed by extending an appropriate length along an axis L;

The

eccentric portion

12, 11 forming the lower end of the appropriate line at a distance D to the shaft body, enabling the shaft 11 to define a shaft section 111 and a lower shaft section 112; the eccentric portion 12 is provided with at least one longitudinally extending direction is formed a sump area 124; and an oil storage area 125 formed in the lateral direction and located around the oil sump area 124; and

The oil inlet passage 13 extends along the axis L through the upper shaft portion 111 and the lower shaft portion 112 of the shaft body 11 and the inside of the eccentric portion 12;

As described in the above structure, it is further explained as follows:

The overall configuration of the eccentric portion 12 formed on the shaft body 11 is further described as follows:

As shown in FIGS. 1 to 3 and FIG. 7, the eccentric portion 12 has an eccentric wheel 121 defining an eccentric amount surface 1211 and a non-eccentric amount surface 1212, and the oil groove region 124 is The oil storage area 125 is located at the non-eccentric amount surface 1212; an upper thrust end 122 is located above the eccentric wheel 121 adjacent to the upper shaft portion 111 of the shaft body 11, which defines an eccentric amount The surface 1221 and a non-eccentric amount surface 1222; and the lower thrust end 123 are located below the eccentric 121 adjacent to the lower shaft section 112 of the shaft body 11, which define an eccentric amount surface 1231 and a non- Eccentricity surface 1232;

Each of the oil groove regions 124 has a groove 1241 extending downward from the top end of each of the eccentric wheels 121 to the bottom end; and an oil drain hole 1242 is disposed at the groove 1241 and is connected to the oil. The channel 13 is in a communicating state;

Wherein, the overall outline of each of the oil storage areas 125 is groove-shaped, and the number thereof is represented by any one of a single track (as shown in FIG. 2) or a plurality of tracks (shown in FIG. 3); The height H2 of the oil storage area 125 is smaller than the height H1 of the eccentric wheel 121. Further, if each of the oil storage areas 125 has a height H2, the height of the eccentric wheel 121 is H1, and the height of each of the oil storage areas 125 is H2. The ratio H2/H1 of the height H1 of the eccentric wheel 121 is 0.9 or less;

The width of each of the oil storage regions 125 is defined by an angle θ between two virtual straight lines (L2, L3) extending from the central axis L1 of each of the eccentric wheels 121 (as shown in FIG. 7). ;

Wherein, the outer peripheral wall of the upper shaft portion 111 of the shaft body 11 is provided with an annular groove 1111 which is circumferentially surrounded and located above the upper thrust end 122; and the outer peripheral wall of the lower shaft portion 112 of the shaft body 11 The upper system is provided with an annular groove 1121 which is circumferentially surrounded and below the lower thrust end 123; and the upper annular groove 1111 and the outer peripheral wall of the lower annular groove 1121 have an oil passage 13 Oil drain holes (11111, 11211) in a communicating state;

2, as shown in FIG. 4-7: the eccentric portion 12 has two eccentric wheels 121, each defining an eccentric amount surface 1211 and a non-eccentric amount surface 1212. The two eccentric wheels 121 are arranged at an appropriate interval. And in the opposite direction, the oil groove area 124 and each of the oil storage areas 125 are located at the non-eccentric amount surface 1212; a connecting section 126 is located between the two eccentric wheels 121; The end 122 is located above the one of the eccentric wheels 121 adjacent to the upper shaft segment 111 of the shaft body 11 and defines an eccentric amount surface 1221 and a non-eccentric amount surface 1222; and a lower thrust end 123, Is located below the other eccentric wheel 121 adjacent to the lower shaft segment 112 of the shaft body 11, which defines an eccentric amount surface 1231 and a non-eccentric amount surface 1232;

Wherein, the overall outline of each of the oil storage areas 125 is groove-shaped, and the number thereof is represented by any one of a single track (as shown in FIG. 5) or a plurality of tracks (as shown in FIG. 6); The height H2 of the oil storage area 125 is smaller than the height H1 of the eccentric wheel 121. Further, if each of the oil storage areas 125 has a height H2, the height of the eccentric wheel 121 is H1, and the height of each of the oil storage areas 125 is H2. The ratio H2/H1 of the height H1 of the eccentric wheel 121 is 0.9 or less;

The width of each of the oil storage regions 125 is defined by an angle θ between two virtual straight lines (L1, L2) extending from the central axis L1 of each of the eccentric wheels 121 (as shown in FIG. 7). ;

Wherein, the outer peripheral wall of the upper shaft portion 111 of the shaft body 11 is provided with an annular groove 1111 which is circumferentially surrounded and located above the upper thrust end 122; and the outer peripheral wall of the lower shaft portion 112 of the shaft body 11 The upper system is provided with an annular groove 1121 which is circumferentially surrounded and below the lower thrust end 123; and the upper annular groove 1111 and the outer peripheral wall of the lower annular groove 1121 have an oil passage 13 The oil drain holes (11111, 11211) in the communicating state.

The utility model also discloses a compressor, as shown in Fig. 1, Fig. 2 and Figs.

Referring to FIG. 8 and FIG. 9 , and referring to FIGS. 1 and 2 , the compressor of the present invention includes a casing 21 , a motor 22 , a compression pump 23 , and a compressor . Upper support 24 and lower support 25; wherein:

The outer casing 21 is integrally formed with a hollow body for accommodating the motor 22, the compression pump 23, the upper support 24 and the lower support 25, and the outer casing 21 is provided with an oil reservoir 210 at the lower portion thereof. To store the refrigerator oil; the outer casing 21 can be further connected to a discharge pipe 26 and a suction pipe 27, the suction pipe 27 can be connected to a liquid accumulator 3 for inputting refrigerant to the compressor 2 through the accumulator 3. Inside;

The motor 22 is disposed in the outer casing 1. The motor 22 includes a stator 221 and a rotor 222. The stator 221 is fixed to the inner wall of the outer casing 21. The rotor 222 is rotatably disposed on the inner side of the stator 221. ;

The compression pump 23 is disposed in the outer casing 21 and located below the motor 22, and the compression pump 23 can be immersed in the refrigerating machine oil of the oil storage tank 210; the compression pump 23 includes at least one cylinder 231 and at least one a ring 232, each of the rings 232 is rotatably disposed in each of the cylinders 231;

In particular, the number of the cylinder 231 and the ring 232 is not limited, that is, the compression pump 23 can be of a single cylinder or a double cylinder, and the cylinder 231 and the ring 232 can be correspondingly set to one or two. The ring 232 is rotatably disposed in the cylinder 231, the ring 232 is connected to the rotor 222 of the motor 22 through a crankshaft 1;

The upper support 24 is disposed in the outer casing 21;

The lower support 25 is disposed in the outer casing 21;

The upper cylinder block 231 is disposed between the upper support 24 and the lower support 25, and the upper support 24 and the lower support 25 are used to support each of the cylinder block 231 and the crankshaft 1; should the system to the crankshaft 1 by the crankshaft of the compressor 1, since the entire configuration of the crank shaft 1 has the stating, it is not repeated;

Therefore, when the crankshaft 1 of the present invention is used, the crankshaft 1 is in the above-described configuration and the compression pump 23 is described as a single cylinder type; the stator 221 is supplied with power, and the rotor is driven through the stator 221. The 222 is rotated to drive the crankshaft 1 to rotate eccentrically, so that the crankshaft 1 can drive the ring 232 to rotate in the cylinder 231, and the upper shaft portion 111 and the lower shaft portion 112 of the shaft body 11 of the crankshaft 1 are used to The upper support 24 and the lower support 25 are supported and operated at a high speed, so that the compression pump 23 as a whole is in an operating state, and as the ring 232 is eccentrically rotated, the gas refrigerant is sucked into the compression pump through the suction pipe 27. In the compression space inside the cylinder 231 of 23, and continuously compressed to a certain pressure, the refrigerant in the compression space is output to the inside of the casing 21; the discharged refrigerant can pass between the casing 21 and the stator 221 a gap, or a gap between the stator 221 and the rotor 222 moves upward, and finally discharged through the discharge pipe 26 into the refrigeration cycle system;

At the same time, since the eccentric portion 12 of the crankshaft 1 cooperates with the ring 232 in the cylinder 231 of the compression pump 23 as a full-circle rotation fit, the oil groove region 124 passing through the non-eccentric amount surface 1212 of the eccentric portion 12 and The oil storage zone 125 is adjacent to reduce the flow resistance of the oil, and the refrigeration oil located at the oil reservoir 210 of the outer casing 21 is subjected to the crankshaft 1 and the compression pump 23 under the influence of the high speed rotation. The refrigerating machine oil flowing in the oil passage 13 and flowing through the oil discharge hole 1242 of the oil groove region 124 of the crankshaft 1 flows to the oil storage region 125 to achieve a storage effect, and on the other hand, can continuously eccentrically the crankshaft 1 The portion 12 is replenished with the lubricating oil between the contact faces of the ring 232 in the cylinder 231, so that the thickness of the oil film on the contact surface between the eccentric portion 12 of the crankshaft 1 and the ring 232 in the cylinder 231 is maintained and the eccentricity is increased. The oil seal of the wheel 121 is used to maintain a desired lubrication state, and the amount of heat generated between the eccentric portion 12 of the crankshaft 1 and the ring 232 in the cylinder 231 is reduced; furthermore, the eccentric portion 12 and the ring can be reduced as a whole. 232 contact area with each other, which in turn reduces the friction load The effect of high oil tightness, while decreasing the leakage of high-pressure refrigerant compressor pump 23 itself, enabling the compressor to reduce power consumption of monomer 2 and enhance the cooling capacity, to improve the overall performance of the compressor 2;

Even the oil drain holes (11111, 11211) provided through the upper annular groove 1111 of the upper shaft section 111 of the shaft body 11 and the lower annular groove 1121 of the lower shaft section 112 of the shaft body 11 are supplied to the crankshaft. The refrigerating machine oil flowing in the oil inlet passage 13 is discharged, and the oil film thickness on the contact surface of the shaft body 11 of the crankshaft 1 and the upper support 24 and the lower support 25 is continuously maintained and the shaft body is increased. 11 oil sealability, thereby maintaining a desired lubrication state, reducing heat generation between the shaft body 11 of the crankshaft 1 and the upper support 24 and the lower support 25;

Thereby, the utility model further provides an effect of reducing the friction force of the crankshaft 1 during use and improving the sealing performance of the oil, thereby prolonging the service life of the crankshaft 1;

Furthermore, the present invention, the crank shaft 1 is also confirmed by experiments, the oil groove area through which the eccentric portion of the crank shaft 112 is provided with a longitudinally extending along the line of least 124; and at least one laterally extending and located along the oil groove The oil storage area 125 formed around the area 124 is designed to reduce the power consumption and the cooling capacity to improve the capacity of the compressor 2 by about 0.3 to 0.5%;

Because of the above housing 2 of the compressor 21, motor 22 and pump 23 is compressed prior art, and the present invention is not limited to the housing 21, the motor 22 and pump 23 is compressed configuration, therefore not be further described in detail.

The above embodiments are only specific implementations of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the present invention. It should be noted that one of ordinary skill in the art A number of variations and modifications may be made without departing from the spirit of the invention, and such obvious alternatives are within the scope of the invention.

Claims

A crankshaft for a compressor, comprising:

a shaft body formed by extending an appropriate length along an axis;

An eccentric portion is formed at an appropriate distance from a lower end of the shaft body to define an upper shaft portion and a lower shaft portion; the eccentric portion is provided with at least one oil groove region extending in a longitudinal direction; and at least An oil storage zone extending in a lateral direction and located around the oil groove zone; and

An oil inlet passage extends through the upper and lower shaft sections of the shaft body and the inner portion of the eccentric portion along the axis.
The crankshaft for a compressor according to claim 1, wherein the eccentric portion has an eccentric wheel defining an eccentric amount surface and a non-eccentric amount surface, and the oil groove region and the oil storage region Then located at the non-eccentric amount surface; an upper thrust end is located above the eccentric and adjacent to the upper shaft portion of the shaft body, which defines an eccentric amount surface and a non-eccentric amount surface; The thrust end is located below the eccentric and adjacent to the lower shaft section of the shaft body, which defines an eccentric amount surface and a non-eccentric amount surface.
The crankshaft for a compressor according to claim 1, wherein the eccentric portion has two eccentric wheels each defining an eccentric amount surface and a non-eccentric amount surface, and the two eccentric wheels are arranged at an appropriate pitch and In the reverse direction, each of the oil groove regions and each of the oil storage regions are located at the non-eccentric amount surface; a connecting portion is located between the two eccentric wheels; and an upper thrust end is located therein An eccentric wheel adjacent to the upper shaft portion of the shaft body defines an eccentric amount surface and a non-eccentric amount surface; and a lower thrust end is located below the other eccentric wheel adjacent to the At the lower shaft section of the shaft body, it defines an eccentric amount surface and a non-eccentric amount surface.
A crankshaft for a compressor according to claim 2 or 3, wherein each of said oil groove regions has a groove extending downward from a top end of each of said eccentric wheels to a bottom end; and a row of oil holes, The system is disposed at the groove and is in communication with the oil inlet passage.
The crankshaft for a compressor according to claim 2 or 3, wherein each of the oil reservoirs has a groove-like overall profile, and the number of the oil reservoirs is one of a single track or a plurality of tracks.
A crankshaft for a compressor according to claim 5, wherein each of said oil reservoirs has a height smaller than a height of said eccentric.
A crankshaft for a compressor according to claim 5, wherein each of said oil reservoirs has a width defined by an angle between two virtual straight lines extending from a central axis of each of said eccentric wheels.
The crankshaft for a compressor according to claim 2 or 3, wherein an outer circumferential wall of the shaft body above the shaft body is provided with a circumferential groove and a ring groove above the upper thrust end. Further, the outer peripheral wall of the shaft section below the shaft body is provided with an annular groove which is circumferentially surrounded and located below the lower thrust end.
The crankshaft for a compressor according to claim 8, wherein the upper annular groove and the outer peripheral wall of the lower annular groove each have an oil discharge hole in a state of being in communication with the oil inlet passage.
A compressor includes: an outer casing having an oil storage groove at a lower portion thereof; a motor disposed in the outer casing; a compression pump disposed in the outer casing, the compression pump including at least one cylinder and at least one a ring, each of the rings is rotatably disposed in each of the cylinders, the ring is connected to the motor through a crankshaft; an upper support is disposed in the outer casing; and a lower support is disposed in the outer casing Each of the cylinder systems is disposed between the upper support and the lower support, and the upper support and the lower support are used to support each of the cylinders and the crankshaft;

The crankshaft is a crankshaft for a compressor according to any one of claims 1 to 9.