Crankshaft, compressor and refrigeration equipment

Abstract

The utility model discloses a crankshaft, compressor and refrigeration equipment relates to compressor technical field, wherein crankshaft comprises eccentric part and two shaft section respectively arranged on the eccentric part both sides, at least one shaft section is provided with a plurality of communication groove, the inner wall of the bearing of compressor is provided with first oil groove and second oil groove that extend along the axial direction of bearing, in the rotating stroke of the crankshaft, the communicating grooves are provided with first positions communicating with the first oil grooves in the corresponding bearings and second positions communicating with the second oil grooves. The multiple communicating grooves are evenly distributed in the circumferential direction of the shaft section at intervals, no matter where the crankshaft is located, lubricating oil can smoothly enter the multiple communicating grooves at the same time, force acting on the shaft section is the same in the circumferential direction, instantaneous pressure unbalance is avoided, and excitation to the crankshaft is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to compressor technical field, especially a crankshaft, compressor and refrigeration plant. BACKGROUND

[0002] As one of the core components of air conditioning system, the working principle of compressor determines that noise will inevitably be produced in the running process, and these noises often have complex composition. Therefore, controlling the noise of compressor is crucial to improve the overall mute performance of air conditioner, and is also a key consideration in the product development process.

[0003] In the compressor, the pump body is one of the main sources of noise. Especially in those compressors that distinguish high pressure area and low pressure area, the communication oil groove in the traditional design will cause the lubricating oil to be directly sprayed from the high pressure area to the low pressure area under the action of pressure difference, and the oil groove design may also cause additional excitation to the crankshaft, thereby causing greater noise and vibration problems when the compressor is running. SUMMARY

[0004] The main purpose of the utility model is to provide a crankshaft, compressor and refrigeration plant, which aims to solve the problem that the lubricating oil in the crankshaft flows from the high pressure area to the low pressure area, which easily causes additional excitation to the crankshaft.

[0005] To achieve the above purpose, the crankshaft provided by the utility model can be rotatably arranged around its axis, the crankshaft comprises an eccentric part and two shaft segments separately arranged on both sides of the eccentric part, at least one of the shaft segments is provided with a plurality of communication grooves, the plurality of communication grooves are uniformly arranged along the circumferential direction of the shaft segment, and the plurality of communication grooves have a first position for communication with a first oil groove on the corresponding bearing and a second position for communication with a second oil groove on the bearing in the rotation stroke of the crankshaft.

[0006] In an embodiment, the two shaft segments include a first shaft segment and a second shaft segment, the plurality of communication grooves include a plurality of first communication grooves arranged on the first shaft segment and a plurality of second communication grooves arranged on the second shaft segment, the plurality of first communication grooves are uniformly arranged along the circumferential direction of the first shaft segment, and the plurality of second communication grooves are uniformly arranged along the circumferential direction of the first shaft segment.

[0007] In an embodiment, the length of the second shaft segment is less than the length of the first shaft segment, the length of the second shaft segment is H, the length of the communication groove in the axial direction of the crankshaft is h, and H / 10≤h≤2H / 3.

[0008] In an embodiment, the outer diameter of the first shaft segment is d1, the groove width of the first communication groove is w1, the groove depth of the first communication groove is d2, d2≤w1≤d1 / 4; and / or,

[0009] In an embodiment, the outer diameter of the second shaft segment is d3, the slot width of the second communication groove is w2, and the slot depth of the second communication groove is d4, d4≤w2≤d3 / 4. In an embodiment, the number of the plurality of first communication grooves is n1, 2≤n1≤4; and / or,

[0010] the number of the plurality of second communication grooves is n2, 2≤n2≤4.

[0011] In an embodiment, each of the two end walls of the communication groove in the axial direction of the crankshaft is provided as an arc surface.

[0012] In an embodiment, the communication groove is provided in a spiral shape, and the pitch of the oil groove is S, 20mm≤S≤400mm.

[0013] In an embodiment, the communication groove is provided in an inclined manner relative to the axial direction of the crankshaft, and the included angle between the length direction of the communication groove and the axial direction of the crankshaft is provided as B, 5°≤B≤90°.

[0014] The utility model also provides a kind of compressor, and the compressor includes:

[0015] Crankshaft, which is rotatably arranged around its axis, includes eccentric part and two shaft segments separately arranged on both sides of the eccentric part, at least one of the shaft segments is provided with a plurality of communication grooves, the plurality of communication grooves are uniformly arranged along the circumferential direction of the shaft segment, and the plurality of communication grooves have a first position for communicating with a first oil groove on a corresponding bearing and a second position for communicating with a second oil groove on a bearing in the rotation stroke of the crankshaft; and,

[0016] Bearing, which is sleeved on the periphery of the corresponding shaft segment, is provided with a first oil groove and a second oil groove extending along the axial direction of the bearing on the inner wall of the bearing, the first oil groove penetrates one end surface of the bearing, and the second oil groove penetrates the other end surface of the bearing, and the plurality of communication grooves each have a first position for communicating with the first oil groove on the corresponding bearing and a second position for communicating with the second oil groove in the rotation stroke of the crankshaft.

[0017] In an embodiment, the compressor is a rotary compressor.

[0018] The utility model also provides a kind of refrigeration equipment, and the refrigeration equipment includes compressor, and the compressor includes:

[0019] A crankshaft is rotatably arranged around an axis, the crankshaft comprises an eccentric part and two shaft segments arranged on both sides of the eccentric part, at least one of the shaft segments is provided with a plurality of communication grooves, the plurality of communication grooves are uniformly arranged along the circumferential direction of the shaft segment, the plurality of communication grooves have a first position for communicating with a first oil groove on a corresponding bearing and a second position for communicating with a second oil groove on the bearing in a rotation stroke of the crankshaft, and

[0020] A bearing is sleeved on the periphery of the corresponding shaft segment, an inner wall of the bearing is provided with a first oil groove and a second oil groove extending along the axial direction of the bearing, the first oil groove penetrates one end surface of the bearing, the second oil groove penetrates the other end surface of the bearing, and in the rotation stroke of the crankshaft, the plurality of communication grooves have the first position for communicating with the first oil groove on the corresponding bearing and the second position for communicating with the second oil groove.

[0021] In an embodiment, the refrigeration equipment comprises an air conditioner.

[0022] In the technical scheme, the bearing of the compressor is sleeved on the shaft segment of the crankshaft, the lubricating oil in the high-pressure area enters the plurality of communication grooves through the first oil groove on the bearing, the plurality of communication grooves on the crankshaft rotate and communicate with the first oil groove when the plurality of communication grooves move to the first position, then the plurality of communication grooves move to the second position and communicate with the second oil groove on the bearing as the crankshaft continues to rotate, the lubricating oil temporarily staying in the plurality of communication grooves flows into the second oil groove after a proper time interval and finally reaches the low-pressure area, the intermittent oil supply mode maintains proper lubrication and reduces oil injection, the plurality of communication grooves are uniformly arranged along the circumferential direction of the shaft segment, the lubricating oil can smoothly enter the plurality of communication grooves at the same time regardless of the position of the crankshaft, the force acting on the shaft segment is the same in the circumferential direction, the instantaneous pressure imbalance is avoided, and the excitation of the crankshaft is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0024] Figure 1 It is a structural schematic diagram of the crankshaft in the related art.

[0025] Figure 2 It is Figure 1Another angle structure schematic view of the crankshaft in the related art;

[0026] Figure 3 The structure schematic view of one embodiment of the crankshaft provided by the utility model;

[0027] Figure 4 For Figure 3 Another angle structure schematic view of the crankshaft in the related art;

[0028] Figure 5 The structure schematic view of one embodiment of the bearing of the compressor provided by the utility model;

[0029] Figure 6 The cross section schematic view of one embodiment of the compressor provided by the utility model.

[0030] Explanation of the reference signs:

[0031] 1', crankshaft; 11', eccentric part; 12', first shaft section; 12a', first communication groove; 13', second shaft section; 13a', second communication groove;

[0032] 1, crankshaft; 11, eccentric part; 10, shaft section; a, communication groove; 12, first shaft section; 12a, first communication groove; 13, second shaft section; 13a, second communication groove; 2, bearing; 2a, first oil groove; 2b, second oil groove.

[0033] The utility model discloses the realization, functional characteristics and advantages will be further explained with reference to the embodiment. DETAILED DESCRIPTION

[0034] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of protection of the utility model.

[0035] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0036] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not in the protection scope required by the utility model.

[0037] In the compressor, the pump body is one of the main noise sources. Especially in those compressors that distinguish high pressure area and low pressure area, the communication oil groove in the traditional design will cause the lubricating oil to be directly sprayed from the high pressure area to the low pressure area under the action of pressure difference, and the oil groove design may also cause additional excitation to the crankshaft and bearing, thereby causing greater noise and vibration problems during the operation of the compressor.

[0038] The utility model provides a kind of crankshaft, compressor and refrigeration equipment, to solve the problem that additional excitation is caused to crankshaft when lubricating oil in compressor flows from high pressure area to low pressure area.

[0039] Please refer to Figures 3 to 6 In an embodiment of the utility model, the compressor includes a crankshaft 1 and a bearing 2, the crankshaft 1 includes an eccentric part 11 and two shaft segments 10 arranged on both sides of the eccentric part 11, at least one of the shaft segments 10 is provided with a plurality of communication grooves a, the plurality of communication grooves a are uniformly arranged along the circumferential direction of the shaft segment 10, and the plurality of communication grooves a have a first position for communication with a first oil groove 2a on the corresponding bearing 2 and a second position for communication with a second oil groove 2b on the bearing 2 in the rotation stroke of the crankshaft 1.

[0040] It can be understood that the crankshaft 1 is rotatably arranged around its axis, and the surface of each shaft segment has the plurality of communication grooves a, which are used to guide the lubricating oil.

[0041] It needs to be explained that the inner wall of the bearing 2 is provided with a first oil groove 2a and a second oil groove 2b extending along the axial direction of the bearing 2, the first oil groove 2a penetrates one end surface of the bearing 2 and communicates with the high-pressure area, the second oil groove penetrates the other end surface of the bearing 2 and communicates with the low-pressure area, in the rotation stroke of the crankshaft 1, the communication groove a moves to the first position and communicates with the first oil groove 2a, the lubricating oil in the high-pressure area enters the first oil groove 2a and then enters the communication groove a, the communication groove a moves to the second position and communicates with the second oil groove 2b, and the lubricating oil remaining in the communication groove a flows through the second oil groove 2b and then enters the low-pressure area.

[0042] In the related art, please refer to Figure 1 and Figure 2 , the crankshaft 1' includes a first shaft segment 12' and a second shaft segment 13' arranged on both sides of the eccentric part 11', a first communication groove 12a' is arranged on the first shaft segment 12', the first communication groove 12a' communicates with the first oil groove and the second oil groove on the corresponding bearing in the rotation stroke of the crankshaft, and a second communication groove 13a' is arranged on the second shaft segment 13', the second communication groove 13a' communicates with the first oil groove and the second oil groove on the corresponding bearing in the rotation stroke of the crankshaft.

[0043] The plurality of communication grooves a are uniformly arranged along the circumference of the bearing 2, so that the flow of the lubricating oil flow is balanced, thereby reducing the excitation of the crankshaft 1 caused by the asymmetric flow of the oil, that is, reducing the additional force acting on the crankshaft 1, and further reducing the noise and vibration.

[0044] In the technical scheme of the utility model, the lubricating oil in the high-pressure area enters the plurality of communication grooves a through the first oil groove 2a, the plurality of communication grooves a on the rotating crankshaft 1 communicate with the first oil groove 2a when moving to the first position, then with the continuous rotation of the crankshaft 1, the plurality of communication grooves a move to the position communicating with the second oil groove 2b, that is, the second position, the lubricating oil temporarily remaining in the plurality of communication grooves a flows into the second oil groove 2b after a proper time interval and finally reaches the low-pressure area, the intermittent oil supply mode maintains proper lubrication and also reduces oil injection, the plurality of communication grooves a are uniformly arranged along the circumference of the crankshaft 1, no matter which position the crankshaft 1 is in, the lubricating oil can smoothly enter the plurality of communication grooves a at the same time, the force acting on the shaft segment 10 is the same in the circumferential direction, the instantaneous pressure imbalance is avoided, and the excitation of the crankshaft 1 is reduced.

[0045] Specifically, in the embodiment, the two shaft segments include a first shaft segment 12 and a second shaft segment 13, the plurality of communication grooves a include a plurality of first communication grooves 12a arranged on the first shaft segment 12 and a plurality of second communication grooves 13a arranged on the second shaft segment 13, the plurality of first communication grooves 12a are arranged uniformly along the circumference of the first shaft segment 12, and the plurality of second communication grooves 13a are arranged uniformly along the circumference of the first shaft segment 13.

[0046] The two bearings 2 are sleeved on the two shaft segments of the crankshaft 1. The positions between the two bearings 2 correspond to the high-pressure area of the compressor, and the sides of the two bearings 2 away from each other are set as the low-pressure area. In the actual lubricating oil flow process, the lubricating oil is transported from the middle part to the two ends of the crankshaft.

[0047] Specifically, in the embodiment, the number of the plurality of first communication grooves 12a is n1, and 2≤n1≤4.

[0048] If the first communication grooves 12a are arranged too much (more than 4), the lubricating oil flow will be too frequent, causing unnecessary oil injection, leading to internal pressure fluctuation of the system, and further increasing noise and vibration.

[0049] And when the first communication grooves 12a are arranged too much, the manufacturing process of the crankshaft 1 is more complicated, the production cost is increased, and the mechanical strength and service life of the crankshaft 1 are weakened.

[0050] Therefore, the number of the first communication grooves 12a is arranged between 2 and 4, which ensures that the lubricating oil can be effectively distributed and circulated, while maintaining the stability of the system and reducing noise and vibration.

[0051] In the embodiment, the number of the plurality of second communication grooves 13a is n2, and 2≤n2≤4.

[0052] If the second communication grooves 13a are arranged too much (more than 4), the lubricating oil flow will be too frequent, the manufacturing process will be more complicated, and the mechanical strength and service life will be easily weakened.

[0053] It can be understood that the number of the first communication grooves 12a and the second communication grooves 13a is the same, which can effectively ensure the stability of the lubricating oil transmission.

[0054] Further, in the embodiment, the two end walls of each communication groove a in the axial direction of the crankshaft 1 are arranged as arc surfaces.

[0055] In this way, a smooth transition path is provided, so that the lubricating oil encounters less resistance when flowing from one communication groove a to another. Compared to a right angle or a flat end wall, the arc-shaped end wall reduces the sudden change in liquid flow, avoiding turbulence or vortex caused by the angle mutation.

[0056] Due to the reduced flow resistance, the lubricating oil can flow more smoothly through the connecting area between the communication grooves a, preventing the lubricating oil from stagnating or accumulating at the junction of the communication grooves a, and ensuring that the lubricating oil is always in a dynamic flow state.

[0057] In the present embodiment, the length of the second shaft segment 13 is set to be less than the length of the first shaft segment 12, the length of the second shaft segment 13 being H, the length of the oil groove in the axial direction of the crankshaft 1 being h, H / 10≤h≤2H / 3.

[0058] It should be noted that if h is too small, the contact area between the communication groove a and the first oil groove 2a or the second oil groove 2b will be reduced when they are in communication. During the rotation of the crankshaft 1, the lubricating oil cannot be smoothly transferred from the first oil groove 2a to the communication groove a, nor can it be smoothly transferred from the communication groove a to the second oil groove 2b, thereby affecting the transfer efficiency of the lubricating oil. In this way, the lubrication effect is reduced, increasing the risk of friction and wear, and possibly generating additional noise and vibration.

[0059] If h is too large, so that the two end walls of the communication groove a exceed the position of the end walls of the first oil groove 2a and the second oil groove 2b approaching each other, the lubricating oil may deviate from the predetermined direction when flowing. The long oil groove changes the flow path of the lubricating oil, causing part of the lubricating oil to not be effectively guided to the low-pressure area as designed, resulting in poor flow of the lubricating oil.

[0060] Therefore, by setting h between H / 10 and 2H / 3, the length of the communication groove a is ensured to provide sufficient contact area to ensure smooth transfer of the lubricating oil, and the flow direction and efficiency of the lubricating oil are not affected by being too long. In this way, effective intermittent oil supply can be achieved, and the stability and quietness of the system can be maintained.

[0061] In some embodiments, the communication groove a is arranged in a spiral shape, the pitch of the communication groove a being S, 20mm≤S≤400mm.

[0062] The communication groove a is arranged in a helical shape along the circumference of the bearing 2, ensuring that the lubricating oil moves along a helical path under pressure rather than diffusing randomly; the helical communication groove a matches the flow direction of the lubricating oil with the rotation direction of the crankshaft 1. When the crankshaft 1 rotates, the centrifugal force generated by the rotation of the crankshaft 1 assists the flow of the lubricating oil, and the lubricating oil naturally advances along the path of the helical groove, reducing the resistance of the lubricating oil flow and making the flow smoother.

[0063] A smaller pitch (e.g. close to 20mm) can make the lubricating oil contact different working surfaces more frequently, providing more intensive lubrication coverage, but it can also increase the manufacturing difficulty and cost. A larger pitch (e.g. close to 400mm) can simplify the structure and reduce material usage, but it can reduce the distribution frequency of the lubricating oil and affect the lubrication effect. Setting the pitch between 20mm and 400mm can balance the lubricating oil flow efficiency and system complexity.

[0064] In other embodiments, the communication groove a is arranged in a straight line along the axial direction of the crankshaft 1. It can also achieve the purpose of interval delivery of the lubricating oil.

[0065] Specifically, the communication groove a is arranged in a straight line and inclined relative to the axial direction of the crankshaft 1. It can be understood that the inclination direction of the communication groove a matches the rotation direction of the crankshaft 1, that is, the flow direction of the lubricating oil can conform to the inclination direction of the communication groove a. The centrifugal force generated by the rotation of the crankshaft 1 makes the lubricating oil naturally advance along the path of the communication groove a, which can reduce the resistance of the lubricating oil flow.

[0066] Please refer to Figure 4 The angle between the length direction of the communication groove a and the axial direction of the crankshaft 1 is set as B, 5°≤B≤90°.

[0067] It should be noted that the length direction of the communication groove a is the direction of the line connecting the two ends of the communication groove a with the longest distance. One end of the length direction of the communication groove a is parallel to the axial direction of the crankshaft 1, and the angle between the straight line and the length direction of the communication groove a is B.

[0068] The communication groove a is arranged inclinedly, and the angle between the length direction of the communication groove a and the axial direction of the crankshaft 1 is set between 5° and 90°. The centrifugal force generated by the rotation of the crankshaft 1 can assist the flow of the lubricating oil, and the lubricating oil will naturally advance along the path of the communication groove a, reducing the resistance of the lubricating oil flow and making the flow smoother.

[0069] Specifically, in the present embodiment, the outer diameter of the first shaft segment 12 is d1, the slot width of the first communication groove 12a is w1, and the slot depth of the first communication groove 12a is d2, d2≤w1≤d1 / 4.

[0070] The slot width w1 of the first communication groove 12a needs to be set to be greater than or equal to the slot depth d2 of the first communication groove 12a. The first communication groove 12a cannot be too narrow, otherwise it will affect the flow amount and flowability of the lubricating oil. A suitable width can ensure that enough lubricating oil can smoothly enter the first communication groove 12a and be effectively distributed to each part that needs lubrication when the crankshaft 1 rotates.

[0071] Setting the slot width w1 of the first communication groove 12a to be less than or equal to d1 / 4 ensures that the first communication groove 12a is not too large, thereby avoiding weakening the structural strength of the crankshaft 1. A first communication groove 12a that is too wide can cause the wall of the crankshaft 1 to thin out, reducing its mechanical strength and thereby affecting the service life and reliability of the crankshaft 1. At the same time, a smaller first communication groove 12a width also helps to maintain the concentration and directionality of the lubricating oil flow, preventing excessive spreading or leakage of the lubricating oil.

[0072] Specifically, in the present embodiment, the outer diameter of the second shaft segment 13 is d3, the slot width of the second communication groove 13a is w2, and the slot depth of the second communication groove 13a is d4, d4≤w2≤d3 / 4.

[0073] In this way, by setting the slot width w2 of the second communication groove 13a to be greater than or equal to d4 and d3 / 4, it can be ensured that enough lubricating oil can smoothly enter the second communication groove 13a and be effectively distributed to each part that needs lubrication when the crankshaft 1 rotates, avoiding weakening the structural strength of the crankshaft 1, and also helping to maintain the concentration and directionality of the lubricating oil flow, preventing excessive spreading or leakage of the lubricating oil.

[0074] It should be noted that a rotary compressor is a device that compresses gas through rotational motion, mainly used in air conditioning, refrigeration systems, etc. The rotary compressor uses one or more rotating components (such as a rotor) to move within a closed space to reduce the volume of gas and increase its pressure. Specifically, the rotary compressor has an eccentrically installed rotor inside, and as the rotor rotates, it forms a series of changing spaces between the rotor and the cylinder wall, which gradually decrease, thereby achieving the intake, compression, and discharge of gas.

[0075] The symmetrically arranged communication grooves a can ensure that the moment generated by the lubricating oil flow is balanced at any rotational position, reducing the unbalanced force caused by asymmetric communication grooves a to reduce the vibration of the bearing 2 and the rotary compressor.

[0076] The utility model discloses still provide a kind of refrigeration equipment, which comprises heat exchanger and compressor, the specific structure of this compressor refers to the above embodiment, since the compressor adopts all technical solutions of the above all embodiments, it at least has all beneficial effects brought by the technical solutions of the above embodiments, here no longer one by one elaboration.

[0077] The refrigeration equipment refers to a device or system for reducing temperature and removing heat, which can be a refrigerator, a freezer or an air conditioner, etc.

[0078] Specifically, in the present embodiment, the refrigeration equipment includes an air conditioner. For the air conditioner, by setting the plurality of communication grooves a on the crankshaft 1 to be uniformly arranged along the circumference of the crankshaft 1, the vibration and noise of the air conditioner can be reduced, providing a comfortable environment for the user's use.

[0079] The above is only an exemplary embodiment of the utility model, and does not limit the patent scope of the utility model, and any equivalent structural transformation made by using the utility model specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the utility model.

Claims

1. A crankshaft, characterized by The crankshaft is rotatably arranged about its axis, and comprises an eccentric portion and two shaft segments arranged on two sides of the eccentric portion. At least one of the shaft segments is provided with a plurality of communication grooves which are uniformly arranged along the circumferential direction of the shaft segment. In the rotation stroke of the crankshaft, the plurality of communication grooves have a first position for communicating with a first oil groove on the corresponding bearing and a second position for communicating with a second oil groove on the bearing.

2. The crankshaft of claim 1 wherein, The two shaft segments comprise a first shaft segment and a second shaft segment, and the plurality of communication grooves comprise a plurality of first communication grooves arranged on the first shaft segment and a plurality of second communication grooves arranged on the second shaft segment. The plurality of first communication grooves are uniformly arranged along the circumferential direction of the first shaft segment, and the plurality of second communication grooves are uniformly arranged along the circumferential direction of the first shaft segment.

3. The crankshaft of claim 2 wherein, The length of the second shaft segment is less than the length of the first shaft segment, the length of the second shaft segment is H, the length of the communication groove in the axial direction of the crankshaft is h, and H / 10≤h≤2H / 3.

4. The crankshaft of claim 2 wherein, The outer diameter of the first shaft segment is d1, the groove width of the first communication groove is w1, and the groove depth of the first communication groove is d2, d2≤w1≤d1 / 4; and / or, The outer diameter of the second shaft segment is d3, the groove width of the second communication groove is w2, and the groove depth of the second communication groove is d4, d4≤w2≤d3 / 4.

5. The crankshaft of claim 2 wherein, The number of the plurality of first communication grooves is n1, and 2≤n1≤4; and / or, The number of the plurality of second communication grooves is n2, and 2≤n2≤4.

6. The crankshaft of claim 1 wherein, Each of the two end walls of the communication groove in the axial direction of the crankshaft is arranged as an arc surface.

7. The crankshaft of claim 1 wherein, The communication groove is arranged in a spiral shape, the pitch of the communication groove is S, and 20mm≤S≤400mm.

8. The crankshaft of claim 1 wherein, The communication groove is arranged obliquely relative to the axial direction of the crankshaft, the included angle between the length direction of the communication groove and the axial direction of the crankshaft is B, and 5°≤B≤90°.

9. A compressor characterized by, Comprise: The crankshaft according to any one of claims 1 to 8; and A bearing is arranged on the periphery of the corresponding shaft segment, and a first oil groove and a second oil groove are arranged on the inner wall of the bearing and extend along the axial direction of the bearing. The first oil groove penetrates one end surface of the bearing, and the second oil groove penetrates the other end surface of the bearing. In the rotation stroke of the crankshaft, the plurality of communication grooves each have a first position for communicating with the first oil groove on the corresponding bearing and a second position for communicating with the second oil groove.

10. The compressor of claim 9, wherein, The compressor is a rotary compressor.

11. A refrigeration appliance characterized in that, The compressor according to claim 9 or 10.

12. The refrigeration appliance of claim 11, wherein, The refrigeration equipment comprises an air conditioner.

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