CN111287940B

CN111287940B - Crankshaft and compressor

Info

Publication number: CN111287940B
Application number: CN201811505545.2A
Authority: CN
Inventors: 孟超; 严志奇; 宋东东
Original assignee: Anhui Meizhi Compressor Co Ltd
Current assignee: Anhui Meizhi Compressor Co Ltd
Priority date: 2018-12-10
Filing date: 2018-12-10
Publication date: 2022-04-05
Anticipated expiration: 2038-12-10
Also published as: CN111287940A

Abstract

The invention provides a crankshaft and a compressor, wherein the crankshaft comprises: the first shaft comprises a first shaft rod and a first mounting plate, and the first mounting plate is mounted on the end face of the first shaft rod; the second shaft comprises a second shaft rod and a second mounting plate, the second mounting plate is mounted on the end face of the second shaft rod, the face, far away from the first shaft rod, of the first mounting plate and the face, far away from the second shaft rod, of the second mounting plate are welded and mounted together, and the first shaft rod is eccentrically arranged relative to the second shaft rod; be provided with the welding protruding muscle on one in first mounting panel and the second mounting panel, the welding protruding muscle can be dissolved in another in first mounting panel and the second mounting panel when first mounting panel and second mounting panel welding installation. The eccentric distance of the first shaft and the second shaft can be adjusted by changing the relative placement positions of the first shaft and the second shaft during installation, so that the crankshaft is better in universality and higher in standardization degree. Meanwhile, the first shaft and the second shaft are welded together, so that the connection quality between the first shaft and the second shaft is better.

Description

Crankshaft and compressor

Technical Field

The invention relates to the field of crankshafts, in particular to a crankshaft and a compressor.

Background

At present, in the related art, a crankshaft of the reciprocating compressor is generally cast and integrally formed in view of wear resistance, and a cast crankshaft of the reciprocating compressor has an eccentric structure, so that the requirement on crankshaft processing equipment is high and the manufacturability is poor in order to ensure the parallelism of a main shaft and an eccentric shaft. Meanwhile, when the displacement of the reciprocating compressor is planned again, parameters such as the shaft diameter of the crankshaft, the eccentricity and the like are changed, according to the traditional scheme, a crankshaft casting mold must be redesigned, the mold is poor in universality and low in standardization degree, and in addition, due to the consideration of energy conservation, emission reduction and environmental protection, the environment pollution caused by a metal casting hot forming process is serious, and the energy consumption is large.

Therefore, how to design a non-integrally cast crankshaft is a problem to be solved.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art or the related art.

The present invention is based on the above problems and provides a crankshaft.

It is a further object of the present invention to provide a compressor including the above crankshaft.

To achieve the above object, an embodiment of a first aspect of the present invention provides a crankshaft, including: a first shaft including a first shaft and a first mounting plate mounted on an end face of the first shaft; the second shaft comprises a second shaft rod and a second mounting plate, the second mounting plate is mounted on the end face of the second shaft rod, the face, far away from the first shaft rod, of the first mounting plate and the face, far away from the second shaft rod, of the second mounting plate are welded and mounted together, and the first shaft rod is eccentrically arranged relative to the second shaft rod; wherein, be provided with the welding protruding muscle on one in first mounting panel with the second mounting panel, the welding protruding muscle can be in first mounting panel with during the second mounting panel welding installation dissolve in first mounting panel with in another of the second mounting panel.

According to the embodiment of the invention, the crankshaft comprises a first shaft and a second shaft which are separately arranged and eccentrically installed, specifically, the first shaft comprises a first shaft rod and a first installation plate, the second shaft comprises a second shaft rod and a second installation plate, when the crankshaft is used for a compressor, one of the first shaft and the second shaft can be connected with a connecting rod of the compressor, and the other of the first shaft and the second shaft can be connected with a motor of the compressor, so that the crankshaft can drive a piston to move in a cylinder under the action of the motor. And the first mounting plate is used for mounting with the second mounting plate to realize the mounting between the first shaft and the second shaft. When the crankshaft is installed, the first shaft lever and the second shaft lever are arranged eccentrically, so that the crankshaft can convert the rotary motion of a motor and the like into the reciprocating linear motion of the connecting rod, and the crankshaft can be applied to products such as a reciprocating compressor and the like. The crankshaft includes a first shaft and a second shaft which are separately arranged, that is, the crankshaft is formed by combining two separate shafts, rather than being integrally formed by casting as in the prior art. And set the bent axle into the axle of two components of a whole that can function independently when the eccentric distance of bent axle needs to be changed, only need change the relative position of placing when primary shaft and secondary shaft installation can, and need not reset the casting mould to integrative casting shaping like this, just so make the eccentric distance of bent axle change easier, thereby make the commonality of bent axle better, the standardization level is higher, just so make the bent axle can satisfy the technological requirement of different products to the bent axle, thereby can save the working costs of bent axle, promote the product development progress. And the first mounting plate and the second mounting plate are mounted together in a welding mode, so that the first shaft and the second shaft which are arranged in a split mode can be mounted more firmly. And through set up the welding protruding muscle on first mounting panel or on the second mounting panel, can strengthen the connection reliability between the two through the welding protruding muscle when welding first mounting panel and second mounting panel to can make the mounting connection between primary shaft and the secondary shaft more reliable.

In addition, the crankshaft provided according to the above embodiment of the present invention has the following additional technical features:

in any of the above technical solutions, preferably, the first shaft and the first mounting plate are integrally formed by a forging process; and/or the second shaft and the second mounting plate are integrally formed by a forging process.

In these technical scheme, the first axle and/or the second axle that the components of a whole that can function independently set up are through forging and pressing shaping for the shaping of bent axle is simple, processing is easy, and it adopts the casting fashioned mode to compare traditional bent axle, and basically to the environmental protection in the manufacturing process, and the consumption of the energy is lower, thereby can make the processing of bent axle more energy-concerving and environment-protective. Meanwhile, for forging processing, only parameters need to be changed properly, the first shaft and the second shaft with different sizes can be processed, so that crankshafts with different shaft diameters can be produced more easily, diversification of products is realized, and therefore when the products need to be updated, difficulty in updating of the products can be reduced, and product development progress is improved.

In any of the above technical solutions, preferably, a surface of the first mounting plate away from the first shaft and a surface of the second mounting plate away from the second shaft are welded together by resistance welding.

Among these technical scheme, first mounting panel and second mounting panel are preferred to weld together through the mode welding of resistance welding, because resistance welding compares welding modes such as laser welding or gas welding, the surface quality of its welding department is better, joint strength is higher, resistance welding is when welding moreover, need not fill metal, and productivity ratio is high, weldment deformation is little, realize the automation easily, and can make two parts effectively combine together after the welding, like this alright improve the installation quality of primary shaft and secondary shaft on the whole, reduce installation cost, improve the installation effectiveness.

Here, the electric resistance welding is a method of welding by locally heating a workpiece by using electric resistance heat generated by passing a current through the workpiece and a contact portion as a heat source and applying pressure.

In any one of the above technical solutions, preferably, a height of the welding bead in an axial direction of the crankshaft is greater than or equal to 0.5 mm.

In these technical schemes, the height of the welding convex rib in the axial direction of the crankshaft is preferably more than or equal to 0.5mm, so that the situation that the welding parts of the first shaft and the second shaft are firm due to insufficient height of the welding convex rib can be prevented, namely the welding strength of the first shaft and the second shaft can be ensured by the arrangement.

In any of the above solutions, preferably, the thickness of the welding bead becomes thinner from the root to the end.

In these technical schemes, the thickness of the welding convex rib is preferably reduced from the root to the end, wherein the root refers to the end of the welding convex rib connected with the first mounting plate or the second mounting plate, and the arrangement can make the thickness of the welding convex rib be thinner when the welding convex rib is initially contacted with the other mounting plate, so that the welding is easier, the welding difficulty can be reduced, and the welding quality can be ensured.

In any one of the above technical solutions, preferably, the welding ribs are annularly arranged along a circumferential direction of the first shaft rod, or annularly arranged along a circumferential direction of the second shaft rod.

Among these some technical schemes, the welding protruding muscle is the annular setting, can increase the area of welding protruding muscle to can increase the welding area of first mounting panel and second mounting panel, alright guarantee welded reliability like this.

In any of the above technical solutions, preferably, the thickness of the welding bead is greater than or equal to 0.2 mm.

In these technical solutions, it is preferable that the thickness of the welding bead, that is, the dimension of the welding bead in the radial direction of the crankshaft is set to be 0.2mm or more, so that the thickness of the welding bead can be ensured, and the welding strength can be ensured.

In any one of the above embodiments, preferably, the inner wall surface of the welding bead is inclined from the root to the end toward the outer side of the welding bead, and/or the outer wall surface of the welding bead is inclined from the root to the end toward the inner side of the welding bead.

In these technical scheme, the internal wall face of welding protruding muscle preferably has an outside tapering, and the preferred leanin of the outer wall face of welding protruding muscle simultaneously just so can make the thickness of welding protruding muscle from root to tip attenuation to can make better welding between first mounting panel and the second mounting panel.

The inner and outer directions of the welding convex rib are consistent with the inner and outer directions of the crankshaft, namely, one side of the welding convex rib close to the center of the first shaft or the second shaft is the inner side, and one side of the welding convex rib departing from the center of the first shaft or the second shaft is the outer side.

Further, preferably, the height of the weld bead in the axial direction of the crankshaft is 0.8mm or more and 1.2mm or less. The height of the welding convex rib can be more reasonable, so that the welding reliability can be ensured, and the condition that the welding convex rib is too high to cause material waste or overlong welding time can be prevented.

Further, it is preferable that the thickness of the welding bead is 0.5mm or more and 0.8mm or less. The thickness that can make protruding muscle like this is more reasonable to can ensure welding reliability promptly, can prevent again that the welding protruding muscle is too thick and lead to the extravagant or the condition of weld time overlength to take place.

In any one of the above technical solutions, preferably, the welding rib is disposed on a surface of the second mounting plate away from the second shaft rod, the shape and size of the welding rib are consistent with those of the second mounting plate, and the welding rib is disposed at an edge of the second mounting plate.

Among these technical scheme, the preferred protruding muscle that will weld sets up on the second mounting panel, and can set up the outer contour line of the protruding muscle of welding along the second mounting panel this moment to make shape and size between them can be unanimous, just so can make the length of the protruding muscle of welding the longest, thereby can ensure welding quality, also can make the structure of the protruding muscle of welding on the second mounting panel more reasonable like this simultaneously.

Preferably, a third groove is formed in the surface, away from the first shaft rod, of the first mounting plate, and the welding convex rib is a wall of the third groove, or a third groove is formed by the welding convex rib on the surface, away from the first shaft rod, of the first mounting plate; and/or a fourth groove is formed in the surface, far away from the second shaft rod, of the second mounting plate, and the welding convex rib is a wall of the fourth groove, or the welding convex rib surrounds the surface, far away from the second shaft rod, of the second mounting plate to form the fourth groove.

In the technical schemes, on one hand, a circle of convex ribs can be directly added on the surface of a mounting plate to be used as welding convex ribs, and on the other hand, a groove can be processed on the mounting plate and then used as the welding convex ribs through the wall of the groove.

In any of the above technical solutions, preferably, a circle of first avoidance grooves is formed in a surface of the first mounting plate, which is close to the first shaft rod, in a circumferential direction around the first shaft rod, and the first avoidance grooves are located at a connection position of the first mounting plate and the first shaft rod; and/or a circle of second avoiding groove is formed in the surface, close to the second shaft rod, of the second mounting plate in a surrounding mode of the second shaft rod in the circumferential direction, and the second avoiding groove is located at the joint of the second mounting plate and the second shaft rod.

In these technical scheme, through set up on first mounting panel and/or the second mounting panel and dodge the groove, can be after the shaping such as forging and pressing at the primary shaft and in subsequent when carrying out the finish machining, for example when carrying out the finish machining through the emery wheel, the accessible dodges the groove and realizes the back chipping of axostylus axostyle, like this alright prevent in subsequent finish machining that the root of axostylus axostyle can not process the condition emergence.

In any of the above technical solutions, preferably, the groove depth of the first avoidance groove is less than or equal to 0.8 mm; the groove depth of the second avoidance groove is less than or equal to 0.8 mm.

In these technical scheme, the degree of depth that dodges the groove is less than or equal to 0.8mm can make the degree of depth that dodges the groove more moderate to even make the root of axostylus axostyle can be processed, can prevent to dodge the groove too big and lead to the intensity of axle not enough again.

Further preferably, the groove depth of the first avoidance groove is greater than or equal to 0.2mm and less than or equal to 0.4 mm; the groove depth of the second avoidance groove is greater than or equal to 0.2mm and less than or equal to 0.4 mm.

In any one of the above technical solutions, preferably, a first inner hole penetrating through the first shaft rod and the first mounting plate is provided on the first shaft along an axial direction of the first shaft, and a second inner hole penetrating through the second shaft rod and the second mounting plate is provided on the second shaft along an axial direction of the second shaft.

In these technical solutions, a first inner hole penetrating through the first shaft in the axial direction may be provided on the first shaft, for example, the first shaft may be directly provided as a hollow shaft, which not only reduces the material usage and manufacturing cost of the first shaft, but also reduces the weight of the first shaft, and realizes a light-weight design of the first shaft, so that when the crankshaft is used in a compressor, etc., the power of the compressor during operation can be reduced at least to some extent, and the reliability of the compressor is improved. On the other hand, the oil can be conducted through the first inner hole of the first shaft, so that the oil can flow to other places along the first shaft. Similarly, a second inner hole penetrating through the second shaft along the axial direction can be arranged on the second shaft, for example, the second shaft can be directly arranged as a hollow shaft, so that the material consumption and the manufacturing cost of the second shaft can be reduced, the weight of the second shaft can be reduced, the lightweight design of the second shaft is realized, the power of the compressor during operation can be reduced to a certain extent at least when the crankshaft is used for the compressor and the like, and the reliability of the compressor is improved. On the other hand, the second inner hole of the second shaft can be used for conducting the lubricating oil, so that the lubricating oil can flow to other places along the second shaft. When the crankshaft is used for products such as a compressor and the like, lubricating oil can be conducted to other positions inside the product through the crankshaft, and the lubrication of other parts inside the product is realized.

In any of the above technical solutions, preferably, a chamfer or a fillet is provided between a surface of the first mounting plate away from the first shaft and an inner wall surface of the first inner hole; and/or a chamfer or a fillet is arranged between the surface of the second mounting plate, which is far away from the second shaft rod, and the inner wall surface of the second inner hole.

In these technical scheme, can increase the open area of first mounting panel or second mounting panel in the inner bore department through setting up chamfer or radius angle, just so can make lubricating oil flow alone more smoothly to can improve the lubricated effect of product.

In any of the above technical solutions, preferably, when a chamfer is provided between a surface of the first mounting plate away from the first shaft rod and an inner wall surface of the first inner hole, and/or a chamfer is provided between a surface of the second mounting plate away from the second shaft rod and an inner wall surface of the second inner hole, a first length and a second length of the chamfer are both less than or equal to 2 mm; and when a fillet is arranged between the surface of the first mounting plate, which is far away from the first shaft lever, and the inner wall surface of the first inner hole, and/or a fillet is arranged between the surface of the second mounting plate, which is far away from the second shaft lever, and the inner wall surface of the second inner hole, the radius of the fillet is less than or equal to 2 mm.

In these technical scheme, chamfer and fillet should not too big, and the radius of fillet, two length and width of chamfer preferably are less than or equal to 2mm, can make the size of chamfer and fillet more moderate like this.

Further preferably, the first length and the second length of the chamfer are both greater than or equal to 0.8mm and less than or equal to 1.2 mm; the radius of the fillet is more than or equal to 0.8mm and less than or equal to 1.2 mm.

In any of the above technical solutions, preferably, a first groove is provided on an inner wall of one side of the first shaft close to the axis of the second shaft, and the first groove is located at a connection position of the first shaft rod and the first mounting plate; and/or a second groove is arranged on the inner wall of one side of the second shaft close to the axis of the first shaft, and the second groove is positioned at the joint of the second shaft rod and the second mounting plate.

In these technical scheme, can set up the recess on the internal face of the one side that first axle and second axle are close to each other, the junction of first axostylus axostyle and first mounting panel, can increase the area of leading to between first axle and the second axle through setting up the first recess on the first axle and setting up the second recess on the second axle on the one hand like this to make the more smooth and easy of lubricating oil circulation. On the other hand, when the eccentric distance between the first shaft and the second shaft is larger, the first groove and the second groove are used for realizing communication between the first shaft and the second shaft, so that the eccentric adjusting range of the first shaft and the second shaft during installation can be enlarged, a crankshaft made of the first shaft and the second shaft can be more universal and standardized, and of course, the first shaft and the second shaft can be assembled into products with more eccentric distances, and the using range of the crankshaft can be enlarged.

In any one of the above technical solutions, preferably, the first shaft rod is provided with a first oil hole communicated with the first inner hole; and/or a second oil hole communicated with the second inner hole is formed in the second shaft rod.

In these technical scheme, through set up first oilhole on first axostylus axostyle for oil in the first inner bore can flow out to the outer wall of primary shaft through first oilhole on, alright lubricate the bearing etc. of installation primary shaft through the oil that flows out from first oilhole like this. In a similar way, the second oil hole is formed in the second shaft rod, so that oil in the second inner hole can flow out of the outer wall of the second shaft through the second oil hole, and the bearing and the like of the second shaft can be lubricated by the oil flowing out of the second oil hole.

Of course, other structures mounted around the first and second shafts may be lubricated by the oil flowing from the first oil holes or the oil flowing from the second oil holes.

Wherein, preferably, when the first oil hole is arranged on the first shaft rod, the diameter of the first oil hole is more than or equal to 1.5 mm; when the second oil hole is formed in the second shaft rod, the diameter of the second oil hole is larger than or equal to 1.5 mm.

In these solutions, the diameter of the oil hole is preferably 1.5mm or more, so that the amount of the lubricating oil flowing out can be secured, and the lubricating effect on the mounting bearing and the like can be secured.

More preferably, the diameter of the first oil hole is 2mm or more and less than 4mm, and the diameter of the second oil hole is 2mm or more and less than 4 mm.

In any of the above technical solutions, preferably, when the eccentricity between the first shaft rod and the second shaft rod is a maximum value and a minimum value, the welding ribs can be completely dissolved into the first mounting plate or the second mounting plate when the first mounting plate and the second mounting plate are welded and mounted.

In these some technical schemes, can rationally set up the size of first mounting panel and second mounting panel to when making the eccentricity of bent axle get maximum value and minimum, the welding protruding muscle homoenergetic can be installed on first mounting panel or second mounting panel, like this alright prevent that the welding protruding muscle position is unreasonable and make the unable reliable welded condition of first mounting panel and second mounting panel take place, thereby can ensure the welding quality between first mounting panel and the second mounting panel.

In any one of the above technical solutions, preferably, the first shaft rod is eccentrically installed at one end of the first installation plate, the second shaft rod is eccentrically installed at the second installation plate, and the second shaft rod is installed corresponding to the other end of the first installation plate.

In these technical schemes, the first shaft lever is eccentrically arranged on the first mounting plate, and preferably, the second shaft lever is also eccentrically arranged on the second mounting plate, and when the mounting device is mounted, the first shaft lever can be mounted on the first end of the first mounting plate, and the second shaft corresponding to the second end of the first mounting plate is mounted on the second mounting plate, so that the first shaft lever and the second shaft lever can be eccentrically arranged in a staggered manner relative to the first mounting plate, and meanwhile, the first shaft lever and the second shaft lever can also be eccentrically arranged in a staggered manner relative to the second mounting plate. Therefore, the first shaft rod and the second shaft rod can be prevented from deflecting towards the same direction, and the structure of the crankshaft can be more reasonable.

In any of the above technical solutions, preferably, at least one mounting hole is provided on the first shaft and/or the second shaft; the crankshaft further includes a counterbalance mounted on the first shaft or the second shaft through the mounting hole.

In these technical scheme, through setting up the mounting hole, can be with balancing piece direct mount in mounting hole department, alright like this guarantee the dynamic balance of bent axle and compressor etc. in the operation through the balancing piece of mounting hole department installation to can reduce the vibration of bent axle and compressor etc.. The balance weight can be arranged on the first shaft or the second shaft, and meanwhile, the balance weight can be detachably arranged on the first shaft or the second shaft in a riveting mode, can also be arranged in an integrated structure with the first shaft or the second shaft, such as a welded integrated structure, and of course, the balance weight can also be integrally formed with the first shaft or the second shaft.

Wherein preferably the mounting hole and the counterweight are mounted on the first shaft, further preferably the mounting hole and the counterweight are mounted on a first mounting plate of the first shaft.

In any one of the above technical solutions, preferably, the number of the mounting holes is two, and the two mounting holes are both disposed on the first shaft and are symmetrically disposed about an axis of the first shaft.

In these technical schemes, the preferred quantity of mounting hole is two that the symmetry set up, makes the balancing piece can the symmetry set up on the bent axle like this to can change and ensure the balance of bent axle.

In any of the above solutions, preferably, the first shaft and the second shaft are made of low carbon steel or alloy steel or low carbon alloy steel.

In these technical solutions, the first shaft and the second shaft are preferably made of low carbon steel or alloy steel or low carbon alloy steel, so that the strength of the first shaft and the second shaft can be ensured, and the service life of the first shaft and the second shaft can be prolonged.

The first shaft and the second shaft can be obtained by forging and pressing cold heading carbon steel materials, and low-carbon alloy steel materials with better precision and surface roughness are preferably used. The low-carbon alloy steel has excellent welding performance and better tensile property, so that the condition that the strength and the weld quality of the crankshaft are influenced by cracking of the crankshaft in the forging and pressing process and cracks and air holes in the welding process can be prevented. Meanwhile, the forged and pressed low-carbon alloy steel material is high in size and shape and position precision, and compared with a cast crankshaft, a part of rough machining procedures can be reduced.

Embodiments of the second aspect of the invention provide a compressor comprising a crankshaft as provided in any of the embodiments of the first aspect.

According to the embodiment of the present invention, the compressor provided with the crankshaft provided in any one of the embodiments of the first aspect is provided, and therefore, the compressor provided in the embodiment of the present invention has all the advantages of the crankshaft provided in any one of the embodiments of the first aspect, which are not listed here.

In any of the above technical solutions, preferably, the compressor includes a cylinder, and a piston is disposed in the cylinder; one end of the connecting rod is connected with the piston, and the other end of the connecting rod is connected with a second shaft of the crankshaft; and the motor is connected with the first shaft of the crankshaft.

In these solutions, the first shaft is a main shaft of the crankshaft, which can be connected to a motor shaft of the motor to rotate under the action of the motor, and the second shaft is a secondary shaft of the crankshaft, which is used to connect to a connecting rod to drive the piston to move in the cylinder. When the motor rotates, the connecting rod can be driven to move through the crankshaft, so that the piston can be driven to move in the cylinder body, the volume of the cylinder body can be changed through the movement of the piston, and the compression of gas can be realized.

The first shaft of the crankshaft and the motor shaft of the motor are of an integrated structure, or the first shaft of the crankshaft and the motor shaft of the motor are of a split structure.

In the technical schemes, the first shaft and the motor shaft can be used as one shaft, so that the use of one shaft can be reduced, and in addition, the first shaft and the motor shaft can also be used as two shafts, so that the motor and the crankshaft can be separately used.

Further preferably, the compressor further comprises a housing, the housing comprises an upper cover and a lower cover which are covered together, and the motor, the crankshaft and the connecting rod are all arranged in the housing.

Wherein the compressor is preferably a reciprocating compressor, although the compressor may be other types of compressors.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural diagram of a crankshaft provided in accordance with an embodiment of the present invention;

FIG. 2 is an exploded schematic view of a crankshaft provided in accordance with an embodiment of the present invention;

FIG. 3 is a schematic diagram of a first shaft of a crankshaft provided in accordance with an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a second shaft of a crankshaft provided in accordance with an embodiment of the present invention;

FIG. 5 is another schematic structural view of a second shaft of a crankshaft provided in accordance with an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 5 is:

1 first shaft, 12 first shaft rod, 122 first oil hole, 14 first mounting plate, 142 first avoiding groove, 144 first rounding off, 16 first inner hole, 18 first groove, 2 second shaft, 22 second shaft rod, 222 second oil hole, 24 second mounting plate, 242 second avoiding groove, 244 second rounding off, 246 fourth groove, 26 second inner hole, 28 second groove, 3 welding convex rib, 4 mounting hole.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.

A crankshaft provided in accordance with some embodiments of the present invention is described below with reference to fig. 1-5.

As shown in fig. 1 to 5, an embodiment of the first aspect of the present invention provides a crankshaft, including: the first shaft 1, the first shaft 1 includes the first axostylus axostyle 12 and first mounting plate 14, the first mounting plate 14 is installed on the terminal surface of the first axostylus axostyle 12; the second shaft 2 comprises a second shaft 22 and a second mounting plate 24, the second mounting plate 24 is mounted on the end face of the second shaft 22, the face, far away from the first shaft 12, of the first mounting plate 14 and the face, far away from the second shaft 22, of the second mounting plate 24 are welded and mounted together, and the first shaft 12 is eccentrically arranged relative to the second shaft 22; wherein, be provided with welding protruding rib 3 on one in first mounting panel 14 and the second mounting panel 24, welding protruding rib 3 can dissolve in another in first mounting panel 14 and the second mounting panel 24 when first mounting panel 14 and the welding installation of second mounting panel 24.

According to the embodiment of the invention, the crankshaft comprises the first shaft 1 and the second shaft 2 which are separately arranged and eccentrically installed, specifically, the first shaft 1 comprises the first shaft rod 12 and the first installation plate 14, the second shaft 2 comprises the second shaft rod 22 and the second installation plate 24, when the crankshaft is used for a compressor, one of the first shaft 1 and the second shaft 2 can be connected with a connecting rod of the compressor, and the other of the first shaft 1 and the second shaft 2 can be connected with a motor of the compressor, so that the crankshaft can drive a piston to move in a cylinder under the action of the motor. And the first mounting plate 14 is adapted to be mounted with the second mounting plate 24 to effect mounting between the first shaft 1 and the second shaft 2. And the first shaft rod 12 and the second shaft rod 22 are eccentrically arranged during installation, so that the crankshaft can convert the rotary motion of a motor and the like into the reciprocating linear motion of a connecting rod, and the crankshaft can be applied to products such as a reciprocating compressor and the like. The crankshaft comprises a first shaft 1 and a second shaft 2 which are separately arranged, namely the crankshaft is formed by combining two separate shafts and is not integrally formed by casting as in the prior art. And set the bent axle into the axle of two components of a whole that can function independently when the eccentric distance of bent axle needs to be changed, only need change the relative position of placing when primary shaft 1 and secondary shaft 2 installation can, and need not reset the casting mould to integrative casting shaping, it is easier that just so make the eccentric distance of bent axle change, thereby make the commonality of bent axle better, the standardization level is higher, just so make the bent axle can satisfy the technological requirement of different products to the bent axle, thereby can save the working costs of bent axle, promote the product development progress. The first mounting plate 14 and the second mounting plate 24 are welded together, so that the first shaft 1 and the second shaft 2 which are separately provided can be more firmly mounted. By providing the welding rib 3 on the first mounting plate 14 or the second mounting plate 24, the reliability of connection between the first mounting plate 14 and the second mounting plate 24 can be enhanced by welding the welding rib 3 when the two are welded, so that the first shaft 1 and the second shaft 2 can be more reliably connected.

In any of the above embodiments, preferably, the first shaft 12 and the first mounting plate 14 are integrally formed by a forging process; and/or the second shaft 22 and the second mounting plate 24 are integrally formed by a forging process.

In the embodiments, the first shaft 1 and/or the second shaft 2 which are separately arranged are formed by forging and pressing, so that the crankshaft is simple to form and easy to process, and compared with the traditional crankshaft which is formed by casting, the crankshaft is basically free of environmental pollution in the manufacturing process, and the energy consumption is lower, so that the crankshaft can be processed more in an energy-saving and environment-friendly manner. Meanwhile, for forging processing, only parameters need to be changed properly, the first shaft 1 and the second shaft 2 with different sizes can be processed, so that crankshafts with different shaft diameters can be produced more easily, diversification of products is realized, and therefore when the products need to be updated, difficulty in updating of the products can be reduced, and product development progress is improved.

In any of the above embodiments, preferably, the face of the first mounting plate 14 remote from the first shaft 12 and the face of the second mounting plate 24 remote from the second shaft 22 are welded together by resistance welding.

In these embodiments, the first mounting plate 14 and the second mounting plate 24 are preferably welded together by resistance welding, because resistance welding has better surface quality of the welded part and higher connection strength compared with welding methods such as laser welding or gas welding, and moreover, resistance welding does not need to fill metal during welding, so that the production efficiency is high, the deformation of the weldment is small, automation is easy to realize, and two parts can be effectively combined together after welding, so that the mounting quality of the first shaft 1 and the second shaft 2 can be improved as a whole, the mounting cost is reduced, and the mounting efficiency is improved.

In any of the above embodiments, it is preferable that the height of the weld bead 3 in the axial direction of the crankshaft is 0.5mm or more.

In these embodiments, the height of the welding bead 3 in the axial direction of the crankshaft is preferably 0.5mm or more, which prevents the first shaft 1 and the second shaft 2 from being welded firmly due to insufficient height of the welding bead 3, i.e., ensures the welding strength of the first shaft 1 and the second shaft 2.

In any of the above embodiments, preferably, the thickness of the welding bead 3 becomes thinner from the root portion to the end portion.

In these embodiments, the thickness of the welding bead 3 is preferably reduced from the root portion, which is the end of the welding bead 3 connected to the first mounting plate 14 or the second mounting plate 24, to the end portion, and this arrangement makes the thickness of the welding bead 3 thinner when initially contacting the other mounting plate, so that the welding can be easier, and thus the welding difficulty can be reduced and the welding quality can be ensured.

In any of the above embodiments, preferably, as shown in fig. 1 and 4, the welding bead 3 is disposed annularly in the circumferential direction of the first shaft rod 12, or annularly in the circumferential direction of the second shaft rod 22.

In these embodiments, the welding rib 3 is provided in a ring shape, which can increase the area of the welding rib 3, so as to increase the welding area of the first mounting plate 14 and the second mounting plate 24, thereby ensuring the reliability of welding.

In any of the above embodiments, the thickness of the welding bead 3 is preferably 0.2mm or more.

In these embodiments, it may be preferable to set the thickness of the welding bead 3, that is, the dimension of the welding bead 3 in the radial direction of the crankshaft, to 0.2mm or more, so that the thickness of the welding bead 3 can be ensured, and thus the welding strength can be ensured.

In any of the above embodiments, it is preferable that the inner wall surface of the welding bead 3 is inclined from the root to the end toward the outer side of the welding bead 3, and/or the outer wall surface of the welding bead 3 is inclined from the root to the end toward the inner side of the welding bead 3.

In these embodiments, the inner wall surface of the welding bead 3 preferably has an outward taper, and the outer wall surface of the welding bead 3 preferably slopes inward, so that the thickness of the welding bead 3 becomes thinner from the root to the end, thereby enabling better welding between the first mounting plate 14 and the second mounting plate 24.

The inner and outer directions of the welding rib 3 are consistent with the inner and outer directions of the crankshaft, that is, one side of the welding rib 3 close to the center of the first shaft 1 or the second shaft 2 is the inner side, and one side of the welding rib 3 departing from the center of the first shaft 1 or the second shaft 2 is the outer side.

Further, it is preferable that the height of the weld bead 3 in the axial direction of the crankshaft is 0.8mm or more and 1.2mm or less. The height of the welding convex rib can be more reasonable, so that the welding reliability can be ensured, and the condition that the welding convex rib 3 is too high to cause material waste or overlong welding time can be prevented.

Further, it is preferable that the thickness of the welding bead 3 is 0.5mm or more and 0.8mm or less. The thickness that can make protruding muscle like this is more reasonable to can ensure welding reliability promptly, can prevent again to weld protruding muscle 3 thick and lead to the extravagant or the condition emergence of welding time overlength of material.

In any of the above embodiments, preferably, as shown in fig. 1 and 4, the welding bead 3 is provided on a surface of the second mounting plate 24 away from the second shaft 22, the welding bead 3 has a shape and size corresponding to those of the second mounting plate 24, and the welding bead 3 is provided at an edge of the second mounting plate 24.

In these embodiments, it is preferable that the welding bead 3 is disposed on the second mounting plate 24, and at this time, the welding bead 3 may be disposed along the outer contour line of the second mounting plate 24 so that the shape and size of the welding bead 3 can be consistent with each other, so that the length of the welding bead 3 can be maximized, thereby ensuring the welding quality, and at the same time, the structure of the welding bead 3 on the second mounting plate 24 can be more reasonable.

Preferably, a third groove is formed on the surface of the first mounting plate 14 away from the first shaft 12, and the welding convex rib is a wall of the third groove, or the welding convex rib surrounds the surface of the first mounting plate 14 away from the first shaft 12 to form the third groove; and/or as shown in fig. 4, a fourth groove 246 is provided on the surface of the second mounting plate 24 away from the second shaft 22, and the welding rib is a wall of the fourth groove 246, or the welding rib surrounds the fourth groove 246 on the surface of the second mounting plate 24 away from the second shaft 22.

In any of the above embodiments, preferably, as shown in fig. 2, a circle of first avoiding grooves 142 is arranged on the surface of the first mounting plate 14 close to the first shaft 12 around the circumferential direction of the first shaft 12, and the first avoiding grooves 142 are located at the connection position of the first mounting plate 14 and the first shaft 12; and/or as shown in fig. 5, a circle of second avoiding grooves 242 is arranged on the surface of the second mounting plate 24 close to the second shaft 22 in the circumferential direction of the second shaft 22, and the second avoiding grooves 242 are located at the connection position of the second mounting plate 24 and the second shaft 22.

In these embodiments, by providing the avoiding groove on the first mounting plate 14 and/or the second mounting plate 24, the shaft rod can be back-gouged by the avoiding groove when the first shaft 1 is formed by forging and pressing and then subjected to subsequent finish machining, for example, when the first shaft is subjected to finish machining by a grinding wheel, so that the situation that the root of the shaft body cannot be machined during the subsequent finish machining can be prevented.

In any of the above embodiments, preferably, the groove depth of the first avoidance groove 142 is 0.8mm or less; the groove depth of the second escape groove 242 is 0.8mm or less.

In the embodiments, the depth of the avoiding groove is less than or equal to 0.8mm, so that the depth of the avoiding groove is moderate, the root of the shaft rod can be machined, and the phenomenon that the strength of the shaft is insufficient due to the fact that the avoiding groove is too large can be prevented.

Further preferably, the groove depth of the first avoiding groove 142 is greater than or equal to 0.2mm and less than or equal to 0.4 mm; the groove depth of the second avoiding groove 242 is 0.2mm or more and 0.4mm or less.

In any of the above embodiments, preferably, as shown in fig. 1 to 5, the first shaft 1 is provided with a first inner hole 16 penetrating the first shaft 12 and the first mounting plate 14 in the axial direction of the first shaft 1, and the second shaft 2 is provided with a second inner hole 26 penetrating the second shaft 22 and the second mounting plate 24 in the axial direction of the second shaft 2.

In these embodiments, a first inner hole 16 penetrating the first shaft 1 in the axial direction may be provided on the first shaft 1, for example, the first shaft 1 may be directly provided as a hollow shaft, which not only can reduce the material usage and manufacturing cost of the first shaft 1, but also can reduce the weight of the first shaft 1, thereby realizing a light weight design of the first shaft 1, so that when a crankshaft is used in a compressor, etc., the power of the compressor during operation can be reduced at least to some extent, and the reliability of the compressor can be improved. On the other hand, the oil can be conducted through the first bore 16 of the first shaft 1, so that the oil can flow along the first shaft 1 to other places. Similarly, a second inner hole 26 penetrating the second shaft 2 in the axial direction may be formed in the second shaft 2, for example, the second shaft 2 may be directly formed as a hollow shaft, which may reduce the material usage and manufacturing cost of the second shaft 2, reduce the weight of the second shaft 2, and achieve a light-weight design of the second shaft 2, thereby reducing the power of the compressor during operation at least to a certain extent when the crankshaft is used in the compressor, and improving the reliability of the compressor. On the other hand, the second bore 26 of the second shaft 2 can be used to conduct the lubricant, so that the lubricant can flow along the second shaft 2 to other places. When the crankshaft is used for products such as a compressor and the like, lubricating oil can be conducted to other positions inside the product through the crankshaft so as to lubricate other parts inside the product.

In any of the above embodiments, preferably, as shown in fig. 3 and 4, a chamfer or first fillet 144 is provided between the face of the first mounting plate 14 remote from the first shaft 12 and the inner wall surface of the first bore 16; and/or a chamfer or second fillet 244 is provided between the face of the second mounting plate 24 remote from the second shaft 22 and the inner wall surface of the second bore 26.

In these embodiments, the opening area of the first mounting plate 14 at the inner hole can be increased by providing the chamfer or the first fillet 144, and the opening area of the second mounting plate 24 at the inner hole can be increased by providing the chamfer or the second fillet 244, so that the lubricating oil can flow alone more smoothly, and the lubricating effect of the product can be improved.

In any of the above embodiments, preferably, when a chamfer is provided between the surface of the first mounting plate 14 away from the first shaft 12 and the inner wall surface of the first bore 16, and/or a chamfer is provided between the surface of the second mounting plate 24 away from the second shaft 22 and the inner wall surface of the second bore 26, both the first length and the second length of the chamfer are less than or equal to 2 mm; when a first fillet 144 is arranged between the surface of the first mounting plate 14 far away from the first shaft 12 and the inner wall surface of the first inner hole 16, and/or a second fillet 244 is arranged between the surface of the second mounting plate 24 far away from the second shaft 22 and the inner wall surface of the second inner hole 26, the radius of the first fillet 144 and the radius of the second fillet 244 are less than or equal to 2 mm.

In the embodiments, the chamfer and the fillet should not be too large, and the radius of the chamfer and the two lengths and widths of the chamfer are preferably less than or equal to 2mm, so that the sizes of the chamfer and the fillet can be moderate.

Further preferably, the first length and the second length of the chamfer are both greater than or equal to 0.8mm and less than or equal to 1.2 mm; the radii of the first rounded corner 144 and the second rounded corner 244 are 0.8mm or more and 1.2mm or less.

In any of the above embodiments, preferably, the inner wall of the first shaft 1 on the side close to the axis of the second shaft 2 is provided with a first groove 18, and the first groove 18 is located at the connection position of the first shaft 12 and the first mounting plate 14; and/or the inner wall of the second shaft 2 on the side close to the axis of the first shaft 1 is provided with a second groove 28, and the second groove 28 is positioned at the joint of the second shaft 22 and the second mounting plate 24.

In these embodiments, a groove may be provided on the inner wall surface of the side where the first shaft 1 and the second shaft 2 approach each other and at the joint of the first shaft rod 12 and the first mounting plate 14, so that on one hand, the conduction area between the first shaft 1 and the second shaft 2 can be increased by the first groove 18 provided on the first shaft 1 and the second groove 28 provided on the second shaft 2, so as to make the flow of the lubricating oil smoother. On the other hand, when the eccentric distance between the first shaft 1 and the second shaft 2 is large, the first groove 18 and the second groove 28 can be used for realizing the communication between the first shaft 1 and the second shaft 2, so that the eccentric adjusting range of the first shaft 1 and the second shaft 2 during installation can be enlarged, a crankshaft made of the first shaft 1 and the second shaft 2 can be more universal and standardized, and of course, the first shaft 1 and the second shaft 2 can be assembled into products with more eccentric distances, and the using range of the crankshaft can be enlarged.

In any of the above embodiments, preferably, as shown in fig. 3, the first shaft 12 is provided with a first oil hole 122 communicating with the first inner hole 16; and/or as shown in fig. 4, the second shaft rod 22 is provided with a second oil hole 222 communicated with the second inner hole 26.

In these embodiments, by providing the first oil hole 122 in the first shaft rod 12, the oil in the first inner hole 16 can flow out to the outer wall of the first shaft 1 through the first oil hole 122, so that the bearing and the like to which the first shaft 1 is mounted can be lubricated by the oil flowing out from the first oil hole 122. Similarly, by providing the second oil hole 222 in the second shaft rod 22, the oil in the second bore 26 can flow out to the outer wall of the second shaft 2 through the second oil hole 222, so that the bearing and the like where the second shaft 2 is mounted can be lubricated by the oil flowing out from the second oil hole 222.

Of course, other structures installed around the first shaft 1 and the second shaft 2 may be lubricated by the oil flowing out of the first oil hole 122 or the oil flowing out of the second oil hole 222.

Wherein, when the first oil hole 122 is provided on the first shaft 12, the diameter of the first oil hole 122 is preferably larger than or equal to 1.5 mm; when the second oil hole 222 is formed in the second shaft 22, the diameter of the second oil hole 222 is not less than 1.5 mm.

In these embodiments, the diameter of the oil hole is preferably 1.5mm or more, so that the amount of outflow of the lubricating oil can be secured, and the lubricating effect on the mounting bearing and the like can be secured.

More preferably, the diameter of the first oil hole 122 is 2mm or more and less than 4mm, and the diameter of the second oil hole 222 is 2mm or more and less than 4 mm.

In any of the above embodiments, preferably, when the eccentricity between the first shaft 12 and the second shaft 22 is at the maximum and minimum, the welding rib 3 can be completely dissolved into the first mounting plate 14 or the second mounting plate 24 when the first mounting plate 14 and the second mounting plate 24 are welded.

In these embodiments, the sizes of the first mounting plate 14 and the second mounting plate 24 can be reasonably set, so that when the eccentricity of the crankshaft is the maximum value and the minimum value, the welding convex rib 3 can be mounted on the first mounting plate 14 or the second mounting plate 24, and thus the situation that the welding convex rib 3 is unreasonable in position and cannot be reliably welded on the first mounting plate 14 and the second mounting plate 24 can be prevented, and the welding quality between the first mounting plate 14 and the second mounting plate 24 can be ensured.

In any of the above embodiments, preferably, as shown in fig. 1 to 5, the first shaft 12 is eccentrically mounted on one end of the first mounting plate 14, the second shaft 22 is eccentrically mounted on the second mounting plate 24, and the second shaft 22 is mounted corresponding to the other end of the first mounting plate 14.

In these embodiments, the first shaft 12 is eccentrically disposed on the first mounting plate 14, and preferably the second shaft 22 is also eccentrically disposed on the second mounting plate 24, and when installed, the first shaft 12 can be mounted on a first end of the first mounting plate 14 and the second shaft 2 can be mounted on the second mounting plate 24 corresponding to a second end of the first mounting plate 14, such that the first shaft 12 and the second shaft 22 can be eccentrically offset relative to the first mounting plate 14, and the first shaft 12 and the second shaft 22 can also be eccentrically offset relative to the second mounting plate 24. This prevents the first shaft lever 12 and the second shaft lever 22 from being deflected in the same direction, and thus the structure of the crankshaft can be made more reasonable.

In any of the above embodiments, preferably, as shown in fig. 3, at least one mounting hole 4 is provided on the first shaft 1 and/or the second shaft 2; the crankshaft further comprises a counterweight (not shown) mounted on the first shaft 1 or on the second shaft 2 through the mounting hole 4.

In these embodiments, by providing the mounting hole 4, the balance weight can be directly mounted at the mounting hole 4, so that the dynamic balance of the crankshaft, the compressor, and the like during operation can be ensured by the balance weight mounted at the mounting hole 4, so as to reduce the vibration of the crankshaft, the compressor, and the like. Here, the balance weight may be disposed on the first shaft 1 or the second shaft 2, and meanwhile, the balance weight may be detachably mounted on the first shaft 1 or the second shaft 2 by riveting, or may be mounted with the first shaft 1 or the second shaft 2 as an integrated structure, such as a welded integrated structure, or of course, the balance weight may be integrally formed with the first shaft 1 or the second shaft 2.

Wherein preferably the mounting hole 4 and the counterweight are mounted on the first shaft 1, further preferably the mounting hole 4 and the counterweight are mounted on the first mounting plate 14 of the first shaft 1.

In any of the above embodiments, preferably, as shown in fig. 3, the number of the mounting holes 4 is two, and the two mounting holes 4 are both provided on the first shaft 1 and are symmetrically provided about the axis of the first shaft 1.

In these embodiments, the number of the mounting holes 4 is preferably two symmetrically arranged, so that the balance weights can be symmetrically arranged on the crankshaft, and the balance of the crankshaft can be more easily ensured.

In any of the above embodiments, preferably the first and

second shafts

1, 2 are made of low carbon steel or alloy steel or low carbon alloy steel.

In these embodiments, the first shaft 1 and the second shaft 2 are preferably made of low carbon steel or alloy steel or low carbon alloy steel, so that the strength of the first shaft 1 and the second shaft 2 can be ensured, and the service life of the first shaft 1 and the second shaft 2 can be prolonged.

The first shaft 1 and the second shaft 2 can be obtained by forging and pressing cold heading carbon steel materials, and low-carbon alloy steel materials with better precision and surface roughness are preferably used. The low-carbon alloy steel has excellent welding performance and better tensile property, so that the condition that the strength and the weld quality of the crankshaft are influenced by cracking of the crankshaft in the forging and pressing process and cracks and air holes in the welding process can be prevented. Meanwhile, the forged and pressed low-carbon alloy steel material is high in size and shape and position precision, and compared with a cast crankshaft, a part of rough machining procedures can be reduced.

An embodiment of a second aspect of the present invention provides a compressor (not shown in the drawings) comprising a crankshaft as provided in any of the embodiments of the first aspect.

In any of the above embodiments, preferably, the compressor includes a cylinder, a piston being disposed in the cylinder; one end of the connecting rod is connected with the piston, and the other end of the connecting rod is connected with a second shaft 2 of the crankshaft; the motor is connected with the first shaft 1 of the crankshaft.

In these embodiments, the first shaft 1 is a main shaft of a crankshaft, which can be connected on the one hand to the motor shaft of the motor to be rotated by the motor, and the second shaft 2 is a secondary shaft of a crankshaft, which is intended to be connected to a connecting rod to move the piston inside the cylinder. When the motor rotates, the connecting rod can be driven to move through the crankshaft, so that the piston can be driven to move in the cylinder body, the volume of the cylinder body can be changed through the movement of the piston, and the compression of gas can be realized.

The first shaft 1 of the crankshaft and the motor shaft of the motor are of an integrated structure, or the first shaft 1 of the crankshaft and the motor shaft of the motor are of a split structure.

In these embodiments, the first shaft 1 can be a single shaft with the motor shaft, which can reduce the use of one shaft, and the first shaft 1 can be two shafts with the motor shaft, which can separate the motor and the crankshaft.

In the description of the present specification, the description of the term "one embodiment" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A crankshaft, comprising:

a first shaft including a first shaft and a first mounting plate mounted on an end face of the first shaft;

the second shaft comprises a second shaft rod and a second mounting plate, the second mounting plate is mounted on the end face of the second shaft rod, the face, far away from the first shaft rod, of the first mounting plate and the face, far away from the second shaft rod, of the second mounting plate are welded and mounted together, and the first shaft rod is eccentrically arranged relative to the second shaft rod;

one of the first mounting plate and the second mounting plate is provided with a welding convex rib, and the welding convex rib can be dissolved into the other one of the first mounting plate and the second mounting plate when the first mounting plate and the second mounting plate are welded and mounted;

a first inner hole penetrating through the first shaft rod and the first mounting plate is formed in the first shaft along the axial direction of the first shaft, and a second inner hole penetrating through the second shaft rod and the second mounting plate is formed in the second shaft along the axial direction of the second shaft;

a first groove is formed in the inner wall of one side, close to the axis of the second shaft, of the first shaft, and the first groove is located at the connecting position of the first shaft rod and the first mounting plate; and/or

A second groove is formed in the inner wall of one side, close to the axis of the first shaft, of the second shaft, and the second groove is located at the connecting position of the second shaft rod and the second mounting plate;

the first shaft rod is eccentrically installed at one end of the first installation plate, the second shaft rod is eccentrically installed on the second installation plate, and the second shaft rod corresponds to the other end of the first installation plate.

2. A crankshaft according to claim 1,

the first shaft rod and the first mounting plate are integrally formed through a forging process; and/or

The second shaft rod and the second mounting plate are integrally formed through a forging process; and/or

The surface of the first mounting plate, which is far away from the first shaft rod, and the surface of the second mounting plate, which is far away from the second shaft rod, are welded and mounted together in a resistance welding mode.

3. A crankshaft according to claim 1,

the height of the welding convex rib in the axial direction of the crankshaft is more than or equal to 0.5 mm; and/or

The thickness of the welding convex rib becomes thinner from the root part to the end part; and/or

The welding convex ribs are annularly arranged along the circumferential direction of the first shaft lever or annularly arranged along the circumferential direction of the second shaft lever; and/or

The thickness of the welding convex rib is more than or equal to 0.2 mm; and/or

The inner wall surface of the welding convex rib is obliquely arranged from the root to the end part to the outer side direction of the welding convex rib, and/or the outer wall surface of the welding convex rib is obliquely arranged from the root to the end part to the inner side direction of the welding convex rib.

4. A crankshaft according to claim 3,

the height of the welding convex rib in the axial direction of the crankshaft is more than or equal to 0.8mm and less than or equal to 1.2 mm; and/or

The thickness of the welding convex rib is more than or equal to 0.5mm and less than or equal to 0.8 mm.

5. A crankshaft according to claim 1,

the welding convex rib is arranged on the surface, away from the second shaft lever, of the second mounting plate, the shape and the size of the welding convex rib are consistent with those of the second mounting plate, and the welding convex rib is arranged at the edge of the second mounting plate.

6. A crankshaft according to claim 1,

a circle of first avoidance grooves are formed in the surface, close to the first shaft rod, of the first mounting plate in the circumferential direction of the first shaft rod, and the first avoidance grooves are located at the connecting position of the first mounting plate and the first shaft rod; and/or

And a circle of second avoiding groove is formed in the surface, close to the second shaft rod, of the second mounting plate in the circumferential direction around the second shaft rod, and the second avoiding groove is located at the joint of the second mounting plate and the second shaft rod.

7. A crankshaft according to claim 6,

the groove depth of the first avoidance groove is less than or equal to 0.8 mm;

the groove depth of the second avoidance groove is less than or equal to 0.8 mm.

8. A crankshaft according to claim 7,

the groove depth of the first avoidance groove is greater than or equal to 0.2mm and less than or equal to 0.4 mm;

the groove depth of the second avoidance groove is greater than or equal to 0.2mm and less than or equal to 0.4 mm.

9. A crankshaft according to claim 1,

a chamfer or a fillet is arranged between the surface of the first mounting plate, which is far away from the first shaft lever, and the inner wall surface of the first inner hole; and/or

And a chamfer or a fillet is arranged between the surface of the second mounting plate, which is far away from the second shaft lever, and the inner wall surface of the second inner hole.

10. A crankshaft according to claim 9,

when a chamfer is arranged between the surface of the first mounting plate, which is far away from the first shaft rod, and the inner wall surface of the first inner hole, and/or a chamfer is arranged between the surface of the second mounting plate, which is far away from the second shaft rod, and the inner wall surface of the second inner hole, the first length and the second length of the chamfer are both less than or equal to 2 mm;

and when a fillet is arranged between the surface of the first mounting plate, which is far away from the first shaft lever, and the inner wall surface of the first inner hole, and/or a fillet is arranged between the surface of the second mounting plate, which is far away from the second shaft lever, and the inner wall surface of the second inner hole, the radius of the fillet is less than or equal to 2 mm.

11. A crankshaft according to claim 10,

the first length and the second length of the chamfer are both greater than or equal to 0.8mm and less than or equal to 1.2 mm;

the radius of the fillet is more than or equal to 0.8mm and less than or equal to 1.2 mm.

12. A crankshaft according to any of the claims 1 to 11,

the first shaft lever is provided with a first oil hole communicated with the first inner hole; and/or

And a second oil hole communicated with the second inner hole is formed in the second shaft rod.

13. A crankshaft according to claim 12,

when the first oil hole is formed in the first shaft rod, the diameter of the first oil hole is larger than or equal to 1.5 mm;

when the second oil hole is formed in the second shaft rod, the diameter of the second oil hole is larger than or equal to 1.5 mm.

14. A crankshaft according to claim 13,

the diameter of the first oil hole is larger than or equal to 2mm and smaller than 4mm, and the diameter of the second oil hole is larger than or equal to 2mm and smaller than 4 mm.

15. A crankshaft according to any of the claims 1 to 11,

when the eccentricity between the first shaft lever and the second shaft lever is the maximum value and the minimum value, the welding convex ribs can be completely dissolved into the first mounting plate or the second mounting plate when the first mounting plate and the second mounting plate are welded and mounted.

16. A crankshaft according to any of the claims 1 to 11,

at least one mounting hole is formed in the first shaft and/or the second shaft;

the crankshaft further includes a counterbalance mounted on the first shaft or the second shaft through the mounting hole.

17. The crankshaft of claim 16,

the number of the mounting holes is two, and the two mounting holes are arranged on the first shaft and are symmetrically arranged relative to the axis of the first shaft.

18. A crankshaft according to any of the claims 1 to 11,

the first shaft and the second shaft are made of low carbon steel.

19. A crankshaft according to any of the claims 1 to 11,

the first and second shafts are made of alloy steel.

20. A crankshaft according to any of the claims 1 to 11,

the first shaft and the second shaft are made of a low carbon alloy steel.

21. A compressor, characterized by comprising a crankshaft according to any one of claims 1 to 20.