Crankshaft, compressor and refrigeration equipment

Abstract

The crankshaft comprises a main shaft part, an eccentric part and fan blades, the main shaft part is arranged at the bottoms of the fan blades, the eccentric part deviates from the axis of the main shaft part and is arranged at the tops of the fan blades, the fan blades are provided with oil holes communicating with the main shaft part and the eccentric part, and first oil storage cavities are formed in the positions, around the oil holes, in the fan blades; the first oil storage cavity is communicated with the oil hole through a first oil guide channel, a balance weight is arranged on the side, opposite to the eccentric part, of the fan blade, a second oil storage cavity is formed in the balance weight and communicated with the first oil storage cavity through a second oil guide channel, and a third oil guide channel extending to the surface of the fan blade is arranged on the radial outer side of the second oil storage cavity. The device has the advantages of few parts, simple structure, low cost, strong oil storage capacity and good oil throwing lubrication effect, can realize the supply lubrication of the piston cylinder hole friction pair at the moment of starting the compressor, avoids the dry friction phenomenon of the piston cylinder hole friction pair during the starting period of the compressor, ensures the reliability of the friction pair, and ensures the service life of the compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of compressors, and particularly to a crankshaft, a compressor and a refrigeration device. BACKGROUND

[0002] It is known that the driving mechanism of a reciprocating piston compressor is motor-crankshaft-connecting rod-piston pin-piston, wherein the main shaft part of the crankshaft is assembled with the motor rotor to provide power input, and the crankshaft cooperates with the connecting rod to convert the rotary motion of the motor into the reciprocating motion of the piston. When the connecting rod pushes the piston to make reciprocating motion in the cylinder bore, strong lateral force is generated, causing friction and wear between the piston and the cylinder bore, increasing the friction work of the piston-cylinder bore friction pair, and in severe cases, causing wear and seizure failure between the piston and the cylinder bore. Therefore, the compressor needs sufficient oil pumping capacity to ensure good lubrication of each friction pair, especially the friction pair between the piston and the cylinder bore. The refrigeration oil is stored in the bottom of the lower shell of the compressor to form a shell oil pool. During continuous operation of the compressor, the refrigeration oil in the oil pool is splashed to the friction pair between the piston and the cylinder bore through the oil path of the crankshaft main shaft part and the oil path of the crankshaft eccentric part under the centrifugal force of the crankshaft, realizing oil pumping lubrication and ensuring good lubrication of each friction pair. When the compressor is stopped, the core temperature is very high and gradually cools down. The lubricating oil of the piston-cylinder bore friction pair gradually evaporates under the action of high temperature, and after a long time of shutdown, the refrigeration oil of the piston-cylinder bore friction pair is consumed and is in a dry friction state. After a long time of shutdown, when the compressor is powered on and operates again, it takes a certain period of time, about 0.5-3 seconds, for the refrigeration oil to reach the piston-cylinder bore friction pair from the oil pool at the bottom of the shell. At this time, the piston-cylinder bore friction pair is in a dry friction state, which greatly damages the surfaces of the piston and the cylinder bore, causing wear, and even causing the compressor to seize. Therefore, the piston-cylinder bore friction pair needs to be immediately lubricated with lubricating oil at the moment of starting to avoid early wear and seizure.

[0003] The existing crankshaft designs are divided into integrated crankshafts and split crankshafts. In the integrated crankshaft, the eccentric part, fan blade, main shaft part and oil pump are integrally designed and manufactured. In the split crankshaft, it is further divided into an oil pump split type and a more complex eccentric part, fan blade, main shaft part and oil pump split type. None of these structures has the ability to quickly lubricate the piston-cylinder bore friction pair during the initial operation of the compressor.

[0004] Therefore, the problems in the related art need to be solved. SUMMARY

[0005] The present application relates to the field of compressors, and particularly to a crankshaft, a compressor and a refrigeration device.

[0006] The technical scheme adopted by the present application to solve the technical problems is: In a first aspect, a crankshaft includes a main shaft portion, an eccentric portion, and a fan blade, the main shaft portion is arranged at the bottom of the fan blade, the eccentric portion is offset from the axis of the main shaft portion and arranged at the top of the fan blade, the fan blade is provided with an oil hole communicating the main shaft portion and the eccentric portion, a first oil storage cavity is arranged around the oil hole inside the fan blade, the first oil storage cavity is communicated with the oil hole through a first oil guide channel, a counterweight is arranged at the opposite side of the eccentric portion of the fan blade, a second oil storage cavity is arranged inside the counterweight, the second oil storage cavity is communicated with the first oil storage cavity through a second oil guide channel, and a third oil guide channel extending to the surface of the fan blade is arranged at the radial outer side of the second oil storage cavity.

[0007] In combination with the first aspect, in some implementations of the first aspect, the fan blade includes a first fan blade and a second fan blade, the first fan blade is assembled on the top of the second fan blade in the thickness direction, the top of the second fan blade is provided with a first oil storage groove, and the first fan blade covers the first oil storage groove and forms the first oil storage cavity.

[0008] In combination with the first aspect and the above implementations, in some implementations of the first aspect, the oil hole includes a first oil hole arranged on the first fan blade and a second oil hole arranged on the second fan blade corresponding to the first oil hole, and the first oil storage groove extends along the circumference of the second oil hole.

[0009] In combination with the first aspect and the above implementations, in some implementations of the first aspect, the top of the second fan blade is provided with a first oil guide groove forming the first oil guide channel on the hole wall of the second oil hole, and the groove bottom of the first oil guide groove is higher than the groove bottom of the first oil storage groove.

[0010] In combination with the first aspect and the above implementations, in some implementations of the first aspect, the first fan blade has a first counterweight, the second fan blade has a second counterweight corresponding to the first counterweight, the top of the second counterweight is provided with a second oil storage groove, the first counterweight covers the second oil storage groove and forms the second oil storage cavity, the groove bottom of the second oil storage groove is lower than the groove bottom of the first oil storage groove, the top of the second fan blade is provided with a second oil guide groove forming the second oil guide channel, the second oil guide groove extends to the groove wall of the second oil storage groove in the radial direction from the groove wall of the first oil storage groove, and the groove bottom of the second oil guide groove is inclined from the first oil storage groove to the second oil storage groove.

[0011] In combination with the first aspect and the above implementations, in some implementations of the first aspect, the wall surface of the second oil storage groove is an inclined surface with a narrowed bottom, a porous oil core is arranged in the second oil storage groove, and the porous oil core is limited in the second oil storage groove by the first counterweight of the first fan blade.

[0012] In some implementation forms of the first aspect, in combination with the first aspect and the above implementation forms, the top of the first vane is provided with a first mounting groove, the eccentric part is in the shape of a cylinder and is embedded and welded in the first mounting groove, and the oil hole is communicated to the inner cavity of the eccentric part.

[0013] In some implementation forms of the first aspect, in combination with the first aspect and the above implementation forms, the main shaft part is in the shape of a tube extending along the axis, the bottom of the second vane is provided with a second mounting groove, the main shaft part is embedded and welded in the second mounting groove, the tube wall of the main shaft part is provided with a plurality of oil permeation holes staggered along the height direction, and the inner part of the main shaft part is provided with a wiper extending from the lower end to the second vane, and the wiper is positioned at the oil permeation hole.

[0014] The second aspect relates to a compressor comprising the crankshaft according to any one of the implementation forms of the first aspect.

[0015] The third aspect relates to a refrigeration device comprising the compressor according to any one of the implementation forms of the second aspect.

[0016] The technical scheme has at least one of the following advantages or beneficial effects: in the technical scheme, the first and second oil storage cavities are arranged in the vane, and are communicated through the second oil guiding channel, the first oil storage cavity collects and stores the refrigerant oil through the first oil guiding channel, and the refrigerant oil is guided into the second oil storage cavity through the second oil guiding channel when the compressor is stopped, so as to form an oil pool. When the compressor is started again, the refrigerant oil in the second oil storage cavity is splashed and thrown out through the third oil guiding channel, so that the piston cylinder hole friction pair can be quickly lubricated, the piston cylinder hole friction pair is ensured to be well lubricated in the first time, and the reliability of the compressor is ensured.

[0017] The technical scheme has at least one of the following advantages or beneficial effects: in the technical scheme, the first and second oil storage cavities are arranged in the vane, and are communicated through the second oil guiding channel, the first oil storage cavity collects and stores the refrigerant oil through the first oil guiding channel, and the refrigerant oil is guided into the second oil storage cavity through the second oil guiding channel when the compressor is stopped, so as to form an oil pool. When the compressor is started again, the refrigerant oil in the second oil storage cavity is splashed and thrown out through the third oil guiding channel, so that the piston cylinder hole friction pair can be quickly lubricated, the piston cylinder hole friction pair is ensured to be well lubricated in the first time, and the reliability of the compressor is ensured.

[0018] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the application will become apparent and be readily appreciated from the description of the embodiments, taken in conjunction with the following drawings in which: Figure 1 is a schematic structural diagram of an embodiment of the crankshaft of the application; Figure 2 is an exploded view of an embodiment of the crankshaft of the application; Figure 3is a schematic diagram of a second fan blade structure of an embodiment of the crankshaft of the present application; Figure 4 is a schematic diagram of a second fan blade structure of an embodiment of the crankshaft of the present application; Figure 5 is a schematic diagram of a second fan blade structure of an embodiment of the crankshaft of the present application; Figure 6 is a schematic diagram of a second fan blade structure of an embodiment of the crankshaft of the present application; Figure 7 is a schematic diagram of a second fan blade structure of an embodiment of the crankshaft of the present application; Figure 8 is a schematic diagram of a second fan blade structure of an embodiment of the crankshaft of the present application; Figure 9 is a schematic diagram of a second fan blade structure of an embodiment of the crankshaft of the present application; DETAILED DESCRIPTION

[0020] This part will describe the specific embodiments of the present application in detail, the preferred embodiments of the present application are shown in the drawings, the role of the drawings is to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the present application, but it cannot be understood as a limitation on the protection scope of the present application.

[0021] In the present application, if the direction (up, down, left, right, front and back) is described, it is only for the convenience of describing the technical scheme of the present application, and is not indicative or suggestive of the technical features indicated must have a specific orientation, structure and operation in a specific orientation, therefore, it cannot be understood as a limitation on the present application.

[0022] In the present application, the meaning of "several" is one or more, the meaning of "multiple" is two or more, "greater than" "less than" "more than" and the like are not included in the number; "above" "below" "within" and the like are included in the number. In the description of the present application, if "first" "second" is described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0023] In the present application, unless otherwise explicitly limited, the words "set", "install", "connect" and the like should be understood broadly, for example, they can be directly connected, or indirectly connected through an intermediate medium; can be fixedly connected, or can be detachably connected, or can be integrally formed; can be mechanically connected, or can be electrically connected or capable of communicating with each other; can be the communication or interaction relationship between two elements or the interaction relationship between two elements. The skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0024] wherein, Figure 1 The reference direction coordinate system of the embodiment of the present application is given, and the embodiment of the present application is described below in combination with the directions shown in the drawings. Figure 1 The reference direction coordinate system of the embodiment of the present application is given, and the embodiment of the present application is described below in combination with the directions shown in the drawings.

[0025] The embodiment of the present application provides a crankshaft, comprising a main shaft part 100, an eccentric part 200 and a fan blade 300, the main shaft part 100 is arranged at the bottom of the fan blade 300, the eccentric part 200 is arranged at the top of the fan blade 300 and deviates from the axis of the main shaft part 100, the fan blade 300 is provided with an oil hole 301 communicating the main shaft part 100 and the eccentric part 200, and the oil pumped upward by the main shaft part 100 can be delivered to the eccentric part 200 through the oil hole 301, a first oil storage cavity is arranged around the oil hole 301 in the inside of the fan blade 300, the first oil storage cavity is communicated with the oil hole 301 through a first oil guiding channel, a counterweight is arranged at the opposite side of the eccentric part 200 of the fan blade 300, the counterweight is arranged at one side of the circumference and rotates with the crankshaft, the distance between the counterweight and the piston 400 changes in a sinusoidal manner with time, that is, when the crankshaft rotates one circle, the counterweight is sometimes far away from the piston 400 and sometimes close to the piston 400, a second oil storage cavity is arranged in the inside of the counterweight, the second oil storage cavity is communicated with the first oil storage cavity through a second oil guiding channel, a third oil guiding channel extending to the surface of the fan blade 300 is arranged at the radially outer side of the second oil storage cavity, so that the oil stored in the second oil storage cavity can be thrown outwards through the third oil guiding channel when the crankshaft rotates.

[0026] Referring to Figure 1 and Figure 9 When the compressor starts to run, the rotating speed is rapidly increased from zero, and the refrigerant oil gradually rises along the crankshaft oil way from the oil groove at the bottom of the shell. In the initial stage, the oil amount is small, and only the oil hole 301 can be partially filled. At this time, under the action of centrifugal force, the small amount of refrigerant oil adheres to the side of the oil hole 301 and flows upward, and does not flow out from the first oil guiding channel, so as to ensure that the refrigerant oil is preferentially supplied upward and the lubrication of the crankshaft, the connecting rod 500 and other parts is ensured. When the rotating speed of the compressor is increased, the refrigerant oil fills the entire oil hole 301, and at this time, the refrigerant oil flows out from the first oil guiding channel and is temporarily stored in the first oil storage cavity.

[0027] The second oil storage cavity is close to the outer side of the counterweight and far away from the center point, and the centrifugal force is increased, which is beneficial to the quick flow of the refrigeration oil. The second oil storage cavity and the first oil storage cavity are provided with a second oil guide channel. When the compressor works, the refrigeration oil exists in the first oil storage cavity under the action of the centrifugal force and cannot flow back to the second oil storage cavity. When the compressor stops, the refrigeration oil in the first oil storage cavity flows into the second oil storage cavity along the second oil guide channel. The outer side of the second oil storage cavity is provided with a third oil guide channel. When the compressor starts, the refrigeration oil in the second oil storage cavity is thrown out through the third oil guide channel and splashes to the piston 400 and the cylinder hole 600 friction pair, lubricates the piston 400 and the cylinder hole 600 friction pair in the first time, and ensures the reliability of the piston 400 and the cylinder hole 600 friction pair.

[0028] In the technical scheme of the present application, the first oil storage cavity and the second oil storage cavity are arranged in the fan blade 300 and are communicated through the second oil guide channel. The first oil storage cavity collects and stores the refrigeration oil through the first oil guide channel and guides the refrigeration oil into the second oil storage cavity through the second oil guide channel when the compressor stops, forming an oil pool. When the compressor starts again, the refrigeration oil in the second oil storage cavity is splashed and thrown out through the third oil guide channel, so that the piston 400 and the cylinder hole 600 friction pair can be quickly lubricated, the piston 400 and the cylinder hole 600 are ensured to be well lubricated in the first time, and the reliability of the compressor is ensured.

[0029] The present application has the advantages of few parts, simple structure, low cost, strong oil storage capacity, good oil throwing and lubricating effect, and can supply lubrication to the piston 400 and the cylinder hole 600 friction pair at the moment of starting the compressor, avoiding dry friction of the piston 400 and the cylinder hole 600 friction pair during starting the compressor, ensuring the reliability of the friction pair and the service life of the compressor.

[0030] In some examples, referring to Figure 1 , Figure 2 , Figure 3 The fan blade 300 includes a first fan blade 302 and a second fan blade 303. The first fan blade 302 and the second fan blade 303 can be made of a steel plate punched or forged. The first fan blade 302 is assembled on the top of the second fan blade 303 in the thickness direction, cooperates with the first fan blade 302, and is laser welded to become a whole. The top of the second fan blade 303 is provided with a first oil storage groove 304, and the first fan blade 302 covers the first oil storage groove 304 and forms a first oil storage cavity. In this embodiment, the first oil storage cavity is arranged through the inner cavity formed by the combination of the two fan blades 300, and the structure is simple, the cost is low, the oil storage capacity is strong, and the oil throwing and lubricating effect is good.

[0031] Further, referring to Figures 1-5The oil hole 301 includes a first oil hole 301a arranged on the first vane 302 and a second oil hole 301b arranged on the second vane 303 corresponding to the first oil hole 301a. The first oil hole 301a is in communication with the second oil hole 301b of the second vane 303 and the inner cavity of the eccentric part 200. The second oil hole 301b is in communication with the first oil hole 301a of the first vane 302 and the inner cavity of the main shaft part 100, thereby playing a role of conducting refrigerant oil. The first oil storage groove 304 is arranged around the second oil hole 301b.

[0032] In some embodiments, referring to Figure 3 、 Figure 4 、 Figure 5 The top of the second vane 303 is provided with a first oil guide groove 305 forming a first oil guide channel on the hole wall of the second oil hole 301b. The first oil guide groove 305 is arranged in one or more. The groove bottom of the first oil guide groove 305 is higher than the groove bottom of the first oil storage groove 304. The bottom of the first oil guide groove 305 is a certain distance from the bottom of the first oil storage groove 304, so as to avoid the backflow of refrigerant oil from the first oil guide groove 305 to the second oil hole 301b when the machine stops.

[0033] In some embodiments, referring to Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 The first vane 302 has a first counterweight 306, and the second vane 303 has a second counterweight 307 corresponding to the first counterweight 306. The second counterweight 307 is provided with a second oil storage groove 308 on the top. The first counterweight 306 covers the second oil storage groove 308 and forms a second oil storage cavity. The groove bottom of the second oil storage groove 308 is lower than the groove bottom of the first oil storage groove 304. The top of the second vane 303 is provided with a second oil guide groove 309 forming a second oil guide channel. The second oil guide groove 309 extends radially from the groove wall of the first oil storage groove 304 to the groove wall of the second oil storage groove 308. The groove bottom of the second oil guide groove 309 is inclined from the first oil storage groove 304 to the second oil storage groove 308. The top of the second vane 303 is provided with a third oil guide groove 310 forming a third oil guide channel. When the machine stops, the refrigerant oil in the first oil storage groove 304 flows into the second oil storage groove 308 along the second oil guide groove 309. The bottom of the second oil guide groove 309 is inclined, which is inclined from the first oil storage groove 304 to the second oil storage groove 308, which is conducive to the rapid flow of refrigerant oil into the second oil storage groove 308.

[0034] The interface between the first oil storage groove 304 and the first counterweight 306 is located on the plane of the main shaft part axis, in other words, the first oil storage groove 304 and the first counterweight 306 are arranged opposite to each other. Under the action of centrifugal force, the refrigerant oil will exist in the first oil storage groove 304 and will not backflow into the second oil hole 301b or the second oil storage cavity.

[0035] Further, referring to Figure 3 ,Figure 4 、 Figure 5 The third oil guide groove 310 has a smaller groove depth than the second oil storage groove 308. The wall surface of the second oil storage groove 308 is a tapered surface with a narrow bottom. The second oil storage groove 308 has a flared shape with a narrow bottom and a wide opening, which is conducive to the refrigerant oil being quickly thrown out of the third oil guide channel by centrifugal force.

[0036] In some embodiments, referring to Figure 1 The second oil storage groove 308 is provided with a porous oil wick 311. The shape of the porous oil wick 311 matches that of the second oil storage groove 308. The porous oil wick 311 is limited in the second oil storage groove 308 by the first counterweight 306 of the first vane 302. The porous oil wick 311 is made of porous medium and can adsorb refrigerant oil. As a preferred embodiment, the oil wick is installed in the second oil storage groove 308. When the compressor is stopped, the position of the crankshaft is random. The third oil guide channel can be close to the piston 400 or far away from the piston 400. When the compressor is stopped, if the third oil guide channel is far away from the piston 400, the refrigerant oil in the second oil storage groove 308 cannot splash to the piston 400 and the cylinder bore 600 friction pair when the refrigerant oil is thrown out. If the refrigerant oil in the second oil storage groove 308 is less and is quickly emptied, the piston 400 and the cylinder bore 600 can not be lubricated by the refrigerant oil. Therefore, the oil wick made of porous medium is needed to adsorb the refrigerant oil. More refrigerant oil is stored, and the throwing out of the refrigerant oil is slowed down, which avoids the refrigerant oil being quickly thrown out and emptied from the second oil storage groove 308, and ensures that the piston 400 and the cylinder bore 600 friction pair are well lubricated during the starting stage of the compressor.

[0037] In some embodiments, referring to Figure 1 、 Figure 7 The top of the first vane 302 is provided with a first mounting groove 312. The eccentric part 200 is in a cylindrical shape, is embedded in and welded to the first mounting groove 312, and the oil hole 301 is connected to the inner cavity of the eccentric part 200.

[0038] In some embodiments, referring to Figure 1 、 Figure 8The main shaft part 100 is in a tubular shape extending along an axis, and can be made by winding a steel plate or by stamping a seamless steel pipe. The bottom of the second vane 303 is provided with a second mounting groove 313, and the main shaft part 100 is embedded and welded in the second mounting groove 313. The tail of the main shaft part 100 is tapered and cooperates with the inner cavity to mount the oil scraping sheet 700. The pipe wall of the main shaft part 100 is provided with a plurality of oil permeation holes 101 staggered in the height direction. The inner part of the main shaft part 100 is provided with the oil scraping sheet 700 extending from the lower end to the second vane 303, and the oil scraping sheet 700 is positioned in the oil permeation hole 101. Specifically, the upper oil permeation hole 101 of the main shaft part 100 has a plurality of upper oil permeation holes 101, and a certain height difference is formed in the height direction, so as to better lubricate the friction pair of the crankshaft and the shaft hole, and also ensure the strength of the main shaft part 100, avoiding setting a plurality of upper oil permeation holes 101 at one height level. The lower oil permeation hole 101 has a plurality of lower oil permeation holes 101, and a certain height difference is formed in the height direction, so as to better lubricate the friction pair of the crankshaft and the shaft hole, and also ensure the strength of the main shaft part 100, avoiding setting a plurality of lower oil permeation holes 101 at one height level.

[0039] The oil scraping sheet 700 is a thin-walled metal sheet extending from the tail of the main shaft part 100 to the outlet of the inner cavity, and the longer oil scraping sheet 700 can improve the oil pumping power. The oil scraping sheet 700 drives the refrigerant oil to be lifted from the bottom inlet of the main shaft part 100 to the second oil hole 301b of the second vane 303, so as to form an oil pumping oil path.

[0040] The embodiment of the utility model provides a kind of compressor, including the crankshaft in any one of the above embodiment.

[0041] The embodiment of the utility model provides a kind of refrigeration equipment, including the compressor in any one of the above embodiment.

[0042] In the description of the present application, the description of the terms "example", "embodiment" or "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0043] Of course, the present application is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or replacements without departing from the spirit of the present application. These equivalent modifications or replacements are included in the scope defined by the claims of the present application.

Claims

1. A crankshaft, characterized by The fan blade includes a first fan blade and a second fan blade, the first fan blade is assembled on the top of the second fan blade along the thickness direction, the top of the second fan blade is provided with a first oil storage groove, and the first fan blade covers the first oil storage groove and forms the first oil storage cavity.

2. The crankshaft of claim 1 wherein, The oil hole includes a first oil hole arranged on the first fan blade and a second oil hole arranged on the second fan blade corresponding to the first oil hole, and the first oil storage groove is arranged around the second oil hole.

3. The crankshaft of claim 2, wherein The top of the second fan blade is provided with a first oil guide groove forming the first oil guide channel on the hole wall of the second oil hole, and the groove bottom of the first oil guide groove is higher than the groove bottom of the first oil storage groove.

4. The crankshaft of claim 3 wherein, The first fan blade has a first counterweight, the second fan blade has a second counterweight corresponding to the first counterweight, the top of the second counterweight is provided with a second oil storage groove, the first counterweight covers the second oil storage groove and forms the second oil storage cavity, the groove bottom of the second oil storage groove is lower than the groove bottom of the first oil storage groove, the top of the second fan blade is provided with a second oil guide groove forming the second oil guide channel, the groove wall of the second oil guide groove extends to the groove wall of the second oil storage groove along the radial direction from the groove wall of the first oil storage groove, and the groove bottom of the second oil guide groove is inclined from the first oil storage groove to the second oil storage groove.

5. The crankshaft of claim 2 wherein, The wall surface of the second oil storage groove is an inclined surface with a narrowed bottom, a porous oil core is arranged in the second oil storage groove, and the porous oil core is limited in the second oil storage groove by the first counterweight of the first fan blade.

6. The crankshaft of claim 5 wherein, The top of the first fan blade is provided with a first mounting groove, the eccentric part is in a cylindrical shape, is embedded in and welded to the first mounting groove, and the oil hole is communicated to the inner cavity of the eccentric part.

7. The crankshaft of claim 2 wherein, The main shaft part is in a tubular shape extending along the axis, the bottom of the second fan blade is provided with a second mounting groove, the main shaft part is embedded in and welded to the second mounting groove, the pipe wall of the main shaft part is provided with a plurality of oil infiltration holes staggered along the height direction, the inner part of the main shaft part is provided with a wiper extending from the lower end to the second fan blade, and the wiper is positioned at the oil infiltration hole.

8. The crankshaft of claim 2 wherein, The crankshaft includes any one of claims 1-8.

9. A compressor characterized by, The compressor includes claim 9.

10. A refrigeration appliance characterized in that, ​

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