Crankshaft, compressor, refrigeration device and method for machining a crankshaft

Abstract

The application discloses a crankshaft, a compressor, a refrigeration device and a crankshaft machining method. The crankshaft comprises a main shaft and an eccentric part. The eccentric part is connected to the main shaft. The outer circumferential surface of the eccentric part is provided with an emptying groove. A plane perpendicular to the axis of the eccentric part is defined as a reference plane. The projection of the bottom surface of the emptying groove on the reference plane is a line segment group. The line segment group comprises at least one line segment. The emptying groove in the embodiment can be machined through linear movement of a tool. Compared with an arc-shaped machining track, the machining time can be shortened, and the machining efficiency is improved. In addition, since relative rotation does not need to occur between the eccentric part and the tool during the machining process, the requirement for the control precision of the machining equipment can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, in particular to a crankshaft, a compressor, a refrigeration device and a crankshaft machining method. BACKGROUND

[0002] In a rotary compressor, the outer circle of the eccentric part of the crankshaft is in clearance fit with the inner circle of the piston, which causes the eccentric part and the piston to have relative rotation in the working process, that is, there is friction between them. In order to reduce the loss caused by friction, an empty slot is usually provided on the eccentric part. In the related art, the machining track of the cutter for machining the empty slot is an arc track along the outer circle contour of the eccentric part, and there are problems of long machining period and low production efficiency. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a crankshaft which can shorten the machining period and improve the machining efficiency.

[0004] The present application also provides a compressor and a refrigeration device having the above-mentioned crankshaft.

[0005] The present application also provides a crankshaft machining method for manufacturing the above-mentioned crankshaft.

[0006] According to the crankshaft of the first aspect of the present application, the crankshaft comprises:

[0007] a main shaft;

[0008] an eccentric part connected to the main shaft, the eccentric part having an empty slot on the outer peripheral surface thereof, defining a reference surface perpendicular to the axis of the eccentric part, the projection of the bottom surface of the empty slot on the reference surface being a line segment group, the line segment group comprising at least one line segment.

[0009] According to the crankshaft of the present application, at least the following beneficial effects are achieved:

[0010] The empty slot in the present embodiment can be machined by linear movement of the cutter, which can shorten the machining time and improve the machining efficiency compared with the arc machining track. In addition, since the eccentric part and the cutter do not need to have relative rotation during the machining process, the requirement for the control accuracy of the machining equipment can be reduced.

[0011] According to some embodiments of the present application, the line segment group comprises a plurality of line segments, and the plurality of line segments are sequentially arranged along the circumferential direction of the eccentric part.

[0012] According to some embodiments of the present application, the distance L1 between the end point of each line segment and the center of the eccentric part, and the diameter D of the eccentric part satisfy L1

[0013] According to some embodiments of the present application, the lengths of the line segments are equal.

[0014] According to some embodiments of the present application, the angles between adjacent line segments are equal.

[0015] According to some embodiments of the present application, the clearance groove is located on one side of the eccentric portion, with the line connecting the center of the eccentric portion to the center of the main shaft as the boundary.

[0016] According to some embodiments of the present application, along the circumferential direction of the eccentric portion, the two side walls of the clearance groove each form an intersection line with the outer circumferential surface, and the distance L2 between the projection points of the intersection lines on the reference plane and the angle a between the line connecting each projection point to the center of the eccentric portion satisfy the following condition: 2*sin -1 (L2 / D)<a<170°, where D is the diameter of the eccentric portion.

[0017] According to some embodiments of the present application, the outer circumferential surface of the eccentric portion further has an oil groove on the same side as the clearance groove, the clearance groove forms a first opening on the outer circumferential surface, the oil groove forms a second opening on the outer circumferential surface, and along the circumferential direction of the eccentric portion, the angle β between the line connecting the center of the first opening to the center of the eccentric portion and the line connecting the center of the second opening to the center of the eccentric portion satisfies the following condition: 0≤β≤140°.

[0018] According to some embodiments of the present application, the clearance groove penetrates through the eccentric portion along the axial direction of the eccentric portion.

[0019] According to some embodiments of the present application, the crankshaft comprises a plurality of eccentric portions arranged along the axial direction of the main shaft, and adjacent eccentric portions are arranged in a center-symmetrical manner, and the clearance grooves of adjacent eccentric portions are arranged on both sides of the line connecting the center of the eccentric portion to the center of the main shaft.

[0020] The compressor according to the second aspect of the present application comprises the crankshaft.

[0021] The refrigeration device according to the third aspect of the present application comprises the compressor.

[0022] The crankshaft machining method according to the fourth aspect of the present application comprises the following steps:

[0023] A tool is arranged with a blank to be machined;

[0024] The tool moves along a straight line to form a clearance groove on the outer circumferential surface of the blank, and the projection of the bottom surface of the clearance groove on the reference plane perpendicular to the axis of the blank is a line segment group, and the line segment group comprises at least one line segment.

[0025] According to some embodiments of the present application, the avoidance groove is formed by relative movement between the tool and the blank along the axial direction of the blank.

[0026] According to some embodiments of the present application, the method further comprises the following steps: after the tool has performed at least one machining along the axial direction of the blank, rotating the blank and the tool by a set angle along the axial direction of the blank, and then performing at least one machining by the tool along the axial direction of the blank, repeating the above actions until the machining is completed.

[0027] Additional aspects and advantages of the present application will be given, partially in the following description, partially become obvious from the following description, or be understood by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] The present application will be further described below in conjunction with the drawings and embodiments, in which:

[0029] Figure 1 is a front view of a crankshaft in an embodiment of the present application;

[0030] Figure 2 is a cross-sectional view of the crankshaft in the embodiment of the present application; Figure 1

[0031] Figure 3 is a cross-sectional view of an avoidance groove with a single planar bottom surface;

[0032] Figure 4 is a cross-sectional view of the avoidance groove in the embodiment of the present application; Figure 1

[0033] is a cross-sectional view of the avoidance groove in the embodiment of the present application; Figure 5 Figure 1

[0034] Figure 6 is a cross-sectional view of a crankshaft in another embodiment of the present application;

[0035] Figure 7 is a cross-sectional view of the crankshaft in the embodiment of the present application; Figure 1

[0036] Figure 8 is a flowchart of a machining method of a crankshaft in an embodiment of the present application.

[0037] LIST OF ELEMENTS:

[0038] spindle 100, first axis 110, first oil hole 120;

[0039] eccentric portion 200, avoidance groove 210, groove wall 211, second axis 220, second oil hole 230, oil groove 240, bearing area 250, non-bearing area 260; ​​​​

[0040] The first center A, the second center B, the first end point C, the second end point D, the third end point E, the fourth end point F, the first projection point G, the first projection point H, the third projection point J, the fourth projection point K, the third center M, and the fourth center N. DETAILED DESCRIPTION

[0041] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar numerals represent the same or similar elements or elements having the same or similar functions throughout the drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0042] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, etc. is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as a limitation on the present application. The indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0043] In the description of the present application, plural means more than two. If there is a description of first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0044] In the description of the present application, unless otherwise explicitly limited, the words such as arrangement, installation, connection, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0045] In the related art, since the outer circumferential surface of the eccentric portion of the crankshaft is circular, the avoidance groove is usually formed by the arc motion of the tool, on the one hand, to adapt to the outer contour shape of the eccentric portion, and on the other hand, the avoidance groove formed along the arc-shaped machining track usually only forms burrs at the positions intersecting with the outer circumferential surface, which is easy to clean. The specific process of machining along the arc-shaped track is that the tool first cuts into the outer circumferential surface of the eccentric portion a certain depth along the radial direction of the eccentric portion, and then cuts off the material in a part of the region of the eccentric portion through the relative rotation between the tool and the eccentric portion. After completing the cutting, the tool and the eccentric portion are moved a certain distance along the axial direction of the eccentric portion, and then the material in the adjacent region is cut off through the relative rotation between the tool and the eccentric portion. The above process is repeated, i.e. the avoidance groove is formed. Since the machining track is a circular arc track, the machining speed is relatively slow, in addition, the tool and the eccentric portion need to be continuously relatively rotated during the machining process, which requires a relatively high control requirement for the machining equipment. Based on the above, the present embodiment discloses a crankshaft which can machine the avoidance groove through the linear motion of the tool, which helps to improve the machining efficiency.

[0046] Referring to Figure 1 , Figure 2 , the crankshaft of the embodiment of the present application comprises a main shaft 100 and an eccentric part 200, the main shaft 100 is used to be connected with a driving mechanism (for example, a rotor) of a compressor, and the eccentric part 200 is used to be connected with a piston of the compressor, when the rotor and a stator are matched to rotate, the crankshaft can be driven to rotate, thereby driving the piston to rotate in a cylinder.

[0047] For the convenience of description, the present application is defined as follows: the axis of the main shaft 100 is a first axis 110, the axis of the eccentric part 200 is a second axis 220, the reference plane is a plane perpendicular to the second axis 220, the intersection of the first axis 110 and the reference plane is the center of the main shaft 100, denoted as a first center A, and the intersection of the second axis 220 and the reference plane is the center of the eccentric part 200, denoted as a second center B.

[0048] As shown in Figure 1 , the second axis 220 of the eccentric part 200 is parallel to the first axis 110 of the main shaft 100, and is spaced apart from the first axis 110 by a certain distance, thereby realizing the eccentric arrangement of the eccentric part 200. The outer circumferential surface of the eccentric part 200 is a circumferential surface, and the piston is sleeved on the outside of the eccentric part 200 and can rotate relative to the eccentric part 200. In order to reduce the friction loss between the eccentric part 200 and the piston, the outer circumferential surface of the eccentric part 200 is provided with a clearance groove 210, and the clearance groove 210 in the present example is made in a way of removing materials, that is, part of the material on the eccentric part 200 is removed by the cutting action of a tool, therefore, the shape of the bottom surface of the clearance groove 210 is different according to the different tool processing trajectories, specifically, when the tool adopts an arc trajectory for processing, the bottom surface of the clearance groove 210 includes an arc surface, and when the tool adopts a straight line trajectory for processing, the bottom surface of the clearance groove 210 includes a plane.

[0049] Referring to Figure 2 , the dashed line in the figure represents the virtual contour of the cut-out part, the projection of the bottom surface of the clearance groove 210 on the reference plane is a line segment group containing at least one line segment, in other words, the bottom surface of the clearance groove 210 is a plane or a combination of planes, based on the above, the clearance groove 210 in the present embodiment can be processed by the linear movement of the tool, specifically, the tool first cuts into the outer circumferential surface of the eccentric part 200 to a certain depth along the radial direction of the eccentric part 200, and then removes the material by the linear movement of the tool and the eccentric part 200 in the axial direction, compared with the arc-shaped processing trajectory, obviously, the linear processing trajectory can shorten the processing time and improve the processing efficiency, in addition, since the relative rotation between the eccentric part 200 and the tool does not occur during the processing, the requirement for the control accuracy of the processing equipment can be reduced.

[0050] It should be noted that the "line segment group" referred to in the present application means that the projection of the bottom surface on the reference surface is composed of line segments, and is not a limitation on the number of line segments. The "line segment group" can only include one line segment, i.e., the bottom surface of the avoidance groove 210 is a complete plane.

[0051] It should be noted that according to the length of the avoidance groove 210 along the circumferential direction of the eccentric part 200, the number of machining times of the tool is different. When the circumferential width of the avoidance groove 210 is small (the avoidance groove 210 is narrow), the tool can machine the avoidance groove 210 by one straight line movement. When the circumferential width of the avoidance groove 210 is large (the avoidance groove 210 is wide), the tool can also machine the avoidance groove 210 by multiple straight line movements.

[0052] As an improved embodiment of the above embodiment, the projection of the bottom surface of the avoidance groove 210 on the reference surface includes a plurality of line segments, which are sequentially connected to form a polyline along the circumferential direction of the eccentric part 200. That is, the bottom surface of the avoidance groove 210 includes a plurality of circumferentially arranged planes. The tool forms the avoidance groove 210 by segmented machining. The reason for using the above method is that the larger the opening area of the avoidance groove 210, the more beneficial it is to reduce friction loss. The opening area of the avoidance groove 210 is affected by the axial length and the circumferential width. The maximum axial length of the opening cannot exceed the axial length of the eccentric part 200. Therefore, the circumferential width is usually increased to increase the opening area of the avoidance groove 210. Referring to Figure 3 and in combination with Figure 2 When the circumferential width of the opening is the same, if the bottom surface of the avoidance groove 210 is a single plane, it means that the tool needs to cut more material. In contrast Figure 2 The avoidance groove 210 is formed by multiple machining. The tool only needs to cut into the eccentric part 200 to a certain depth. The overall material removal amount is significantly reduced, which helps to improve the machining efficiency.

[0053] It should be noted that when the circumferential width of the avoidance groove 210 is large, even if it is formed by multiple machining, the circumferential width of a single plane will still be greater than the size of the tool in that direction. Therefore, the tool can machine the single plane by multiple straight line movements.

[0054] Referring to Figure 2When the bottom surface of the avoidance groove 210 comprises multiple planes, the projection of the bottom surface on the reference surface is a continuous broken line, each broken line point on the broken line is the end point of each line segment, as a further improvement of the above embodiment, the length L1 of the line between each end point and the second center B of the eccentric part 200 satisfies the following relationship with the diameter D of the eccentric part 200: L1 < D, in this way, it can be ensured that the eccentric part 200 will not contact the piston in the area of the avoidance groove 210. Specifically, the bottom surface of the avoidance groove 210 is shown to comprise three planes, the broken line formed by the projection has four end points, which are respectively denoted as a first end point C, a second end point D, a third end point E and a fourth end point F, wherein the line segment CD, the line segment DE and the line segment EF are the projection lines of each bottom surface on the reference surface, the lengths of the line segment CB, the line segment DB, the line segment EB and the line segment FB are all less than the diameter of the eccentric part 200, in other words, each part of the bottom surface of the avoidance groove 210 is lower than the outer circumferential surface of the eccentric part 200.

[0055] It should be noted that the length of the line between each end point and the second center B of the eccentric part 200 can be equal or not equal.

[0056] Referring to Figure 2 When the bottom surface of the avoidance groove 210 comprises multiple planes, the projection of the bottom surface on the reference surface is a continuous broken line, as a further improvement of the above embodiment, the lengths of each line segment in the broken line are equal, and the avoidance groove 210 shown in Figure 2 is taken as an example, that is, the lengths of the line segment CD, the line segment DE and the line segment EF are equal, which also means that the circumferential lengths of each plane are equal. In this way, when the same tool is used, the machining times and machining times of each plane are approximately equal, thereby simplifying the control.

[0057] Referring to Figure 2 When the bottom surface of the avoidance groove 210 comprises multiple planes, the projection of the bottom surface on the reference surface is a continuous broken line, as a further improvement of the above embodiment, the angles of adjacent line segments in the broken line are equal, and the avoidance groove 210 shown in Figure 2 is taken as an example, that is, the angles between the line segment CD and the line segment DE, and the line segment DE and the line segment EF are equal, which also means that the angles between adjacent planes are equal. When the tool finishes machining the first plane and resets, the tool and the eccentric part 200 are relatively rotated, the tool then machines the adjacent second plane, after the machining of the second plane is completed, the tool and the eccentric part 200 are relatively rotated again, and the above steps are repeated to complete the machining of the entire avoidance groove 210, the equal angles between adjacent planes means that the angle of relative rotation between the tool and the eccentric part 200 is equal each time, which also serves the purpose of simplifying the control.

[0058] Need to explain, in the above embodiment, the processing site of the cutter needs to be adjusted, the eccentric part 200 can be kept stationary, and the cutter can be rotated relative to the eccentric part 200, or the cutter can be kept stationary, and the eccentric part 200 can be rotated relative to the cutter.

[0059] In the embodiment of the application, the scheme in which the lengths of the line segments in the broken line are equal and the scheme in which the angles between adjacent line segments are equal can be used in combination, that is, the single movement distance of the cutter, the number of times of processing of the cutter, and the angle of relative rotation between the cutter and the eccentric part 200 can all remain unchanged during the entire processing process.

[0060] Referring to Figure 2 The inner part of the crankshaft is further provided with a first oil hole 120, a second oil hole 230, and an oil groove 240. The first oil hole 120 is a main oil hole, the axis of which coincides with the first axis 110 of the main shaft 100 and extends from the main shaft 100 to the eccentric part 200. The second oil hole 230 is arranged in the inner part of the eccentric part 200, one end of which communicates with the first oil hole 120, and the other end of which communicates with the oil groove 240 on the outer circumferential surface of the eccentric part 200. The refrigeration oil can move to the space between the eccentric part 200 and the piston through the first oil hole 120, the second oil hole 230, and the oil groove 240 to form an oil film, thereby achieving the lubrication and cooling of the eccentric part 200 and the piston.

[0061] As shown in the figure, the outer circumferential surface of the eccentric part 200 can be divided into a bearing area 250 and a non-bearing area 260 by a line connecting the second center B of the eccentric part 200 to the first center A of the main shaft 100. The bearing area 250 is a driving part of the eccentric part 200 for driving the piston to rotate. In the embodiment, the oil groove and the relief groove 210 are arranged in the non-bearing area 260 of the eccentric part 200, which can ensure the integrity of the outer circumferential surface of the bearing area 250, so that the bearing area 250 can withstand a larger force.

[0062] The larger the opening area of the relief groove 210, the more conducive to reducing friction loss, and the longer the corresponding processing time. Conversely, the larger the opening area of the relief groove 210, the weaker the function of reducing friction loss, and the shorter the corresponding processing time. On the basis of the same axial length of the eccentric part 200, the circumferential width of the relief groove 210 directly affects the opening area of the relief groove 210. Therefore, in the further improved embodiment of the above embodiment, the circumferential width of the relief groove 210 is limited by the following relationship: -1 (L2 / D)<α<170°, specifically, referring to Figure 4, along the circumferential direction of the eccentric portion 200, the two side walls 211 of the avoidance groove 210 and the outer circumferential surface of the eccentric portion 200 will form two intersection lines, and the two intersection lines will form two projection points on the reference surface, which are respectively recorded as the first projection point G and the first projection point H. The distance between the first projection point G and the first projection point H is the above-mentioned distance L2, and the included angle between the line GB and the line HB is the above-mentioned included angle a. The diameter D is the diameter of the eccentric portion 200, which is a fixed value. According to the above formula, as the distance L2 increases, the included angle a will also increase, but the included angle a has an upper limit, that is, 170°, that is, the length of the distance L2 will not exceed the diameter D at all times, which ensures that the avoidance groove 210 will not exceed the non-bearing area 260. When focusing on reducing the friction loss between the eccentric portion 200 and the piston, the included angle a can be valued towards the upper limit value, and when focusing on increasing the processing efficiency of the avoidance groove 210, the included angle a can be valued towards the lower limit value. By setting different included angles a, different scene requirements can be met.

[0063] As a further improvement of the above-mentioned embodiment, when the avoidance groove 210 and the oil groove 240 are both located in the non-bearing area 260, the positional relationship between the avoidance groove 210 and the oil groove 240 is further limited by the following relationship formula: 0≤β≤140°, referring to Figure 5 , the avoidance groove 210 forms a first opening on the outer circumferential surface, and the oil groove 240 forms a second opening on the outer circumferential surface. Along the circumferential direction of the eccentric portion 200, the two end points of the first opening are the above-mentioned first projection point G and the first projection point H. Similarly, the two side walls 241 of the oil groove 240 and the outer circumferential surface of the eccentric portion 200 will form two intersection lines, and the two intersection lines will form two projection points on the reference surface, which are respectively recorded as the third projection point J and the fourth projection point K. A first virtual circular arc (represented by a dashed line in the figure) connecting the first projection point G and the first projection point H and equal to the diameter of the eccentric portion 200 is established, and a second virtual circular arc (represented by a dashed line in the figure) connecting the third projection point J and the fourth projection point K and equal to the diameter of the eccentric portion 200 is established. The midpoint of the first virtual circular arc is the third center M, and the midpoint of the second virtual circular arc is the fourth center N. The included angle between the line MB and the line NB is the above-mentioned included angle β. According to the above formula, the center of the oil groove 240 and the center of the avoidance groove 210 can coincide (i.e. the included angle β is 0°). According to the different circumferential widths of the oil groove 240 and the avoidance groove 210, the oil groove 240 and the avoidance groove 210 can have the following positional relationship: 1. The oil groove 240 is located outside the avoidance groove 210, for example Figure 5 , in this scenario, the circumferential width difference between the avoidance groove 210 and the oil groove 240 is usually small; 2. The oil groove 240 is located inside the avoidance groove 210, for example Figure 6As shown, in this scenario, the circumferential width of the air-cushioning groove 210 is usually much larger than the circumferential width of the oil trough 240. The oil trough 240 is located on the bottom surface of the air-cushioning groove 210. It should be noted that the opening of the second oil hole 230 can directly lead to the bottom surface of the air-cushioning groove 210, that is, the air-cushioning groove 210 is used as the oil trough 240.

[0064] Reference Figure 1 As a further improvement of the above embodiment, the clearance groove 210 extends through the eccentric portion 200 along the axial direction of the eccentric portion 200. On the one hand, this can maximize the axial width of the clearance groove 210, thereby increasing the opening area of ​​the clearance groove 210. On the other hand, it can also reduce the control difficulty of the tool when machining along a straight trajectory.

[0065] To accommodate multi-cylinder compressors, in an improved embodiment of the present invention, the crankshaft includes multiple eccentric portions 200, which are sequentially arranged along the axial direction of the main shaft 100. Adjacent eccentric portions 200 are symmetrically arranged about the first axis 110 of the main shaft 100 as the axis of symmetry. Figure 1 As shown in the example, the crankshaft includes two eccentric portions 200. The upper eccentric portion 200 is offset to the right of the main shaft 100, and the lower eccentric portion 200 is offset to the left of the main shaft 100. The centers of each eccentric portion 200 and the center of the main shaft 100 are on the same plane. (Refer to...) Figure 7 With the line connecting the center of the eccentric part 200 and the center of the main shaft 100 as the boundary, the clearance grooves 210 of two adjacent eccentric parts 200 are respectively set on both sides of the connecting line, so that the bearing area 250 of the adjacent eccentric parts 200 can be set on both sides of the connecting line, making the crankshaft more evenly stressed during rotation.

[0066] It should be noted that when an eccentric part 200 is provided with a separate oil groove 240, the oil grooves 240 of adjacent eccentric parts 200 are also provided on both sides of the connecting line. In addition, the two clearance grooves 210 of adjacent eccentric parts 200 and the two oil grooves 240 can be symmetrically arranged with the first axis 110 of the main shaft 100 as the axis of symmetry.

[0067] Other embodiments of the present invention also disclose a compressor that includes the crankshaft of the above embodiments.

[0068] Other embodiments of the present invention also disclose refrigeration equipment, which includes the compressors of the above embodiments.

[0069] refer to Figure 8 Other embodiments of the present invention also disclose a crankshaft machining method, which uses the linear movement of a cutting tool to machine a clearance groove to prepare the crankshaft described in the above embodiments, comprising the following steps:

[0070] S100 prepares a rod-shaped blank to be processed and corresponding processing equipment. The rod-shaped blank can be fixed in a conventional manner, for example, the two ends of the rod-shaped blank are fixed on the processing equipment by a clamping jaw or other mechanism, so that the rod-shaped blank can rotate around its own axis. The processing equipment includes a cutter that can move at least in the axial and radial direction of the rod-shaped blank.

[0071] S200 moves the cutter to cut into the outer circumferential surface of the rod-shaped blank to a certain depth in the radial direction, and then the cutter processes along a straight line trajectory, thereby processing an avoidance groove on the outer circumferential surface of the rod-shaped blank. According to this step, the projection of the bottom surface of the avoidance groove on the reference surface is a line segment group including at least one line segment, that is, the bottom surface of the avoidance groove is a plane or a combination of planes.

[0072] As an improvement of the above processing scheme, the cutter and the rod-shaped blank can move relative to each other in the axial direction of the rod-shaped blank. In this way, the cutting depth of the cutter remains unchanged during a single processing process, and the forces on the cutter and the rod-shaped blank are more balanced, which facilitates ensuring the processing quality and reducing the control difficulty. It should be noted that in the above scheme, the cutter can be actively moved, or the rod-shaped blank can be actively moved.

[0073] As a further improvement of the above processing scheme, when the circumferential width of the avoidance groove is large, the avoidance groove can be formed by multi-segment processing, which specifically includes the following steps:

[0074] S210 first processes a smaller groove along the axial straight line processing trajectory, and then the cutter is reset;

[0075] S220 rotates the rod-shaped blank relative to the cutter by a set angle, so that the cutter is aligned with the adjacent processing area of the groove, and then the cutter processes the area, thereby expanding the groove in the circumferential direction of the rod-shaped blank;

[0076] S230 repeats the above steps until the processing is completed, and the groove bottom surface of the obtained avoidance groove includes multiple planes, and the adjacent planes have a non-zero included angle.

[0077] Based on the above method, the overall material removal amount can be reduced, and the processing efficiency can be improved. It should be noted that when the circumferential width of the avoidance groove is large, even if segmented processing is performed, the circumferential width of each plane is greater than the circumferential width of the cutter. Therefore, when processing a single plane, segmented processing can also be performed, that is, after the cutter completes a processing in the axial direction, it is offset by a set distance in a direction parallel to the plane, and then it is moved in the opposite direction to complete the next processing until the processing is completed.

[0078] In addition, when the single plane is processed by the multi-stage processing mode, the number of reciprocating processing of the cutter and the offset can be kept unchanged, so as to reduce the control amount of the cutter, and the circumferential width of each plane made accordingly will also remain unchanged. On the other hand, when the entire avoidance slot is processed by the multi-stage processing mode, the angle of relative rotation between the cutter and the rod-shaped blank can be kept unchanged, and the included angle of each plane made accordingly will also remain unchanged.

[0079] The above describes the embodiments of the present application in detail in combination with the drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge range possessed by those skilled in the art without departing from the purpose of the present application.

Claims

1. A crankshaft, characterized in that, include: spindle; An eccentric part is connected to the main shaft. The outer peripheral surface of the eccentric part has a clearance groove. A plane perpendicular to the axis of the eccentric part is defined as a reference plane. The projection of the bottom surface of the clearance groove onto the reference plane is a line segment group. The line segment group includes at least one line segment. The outer peripheral surface of the eccentric portion also has an oil groove, the oil groove and the clearance groove are located on the same side of the eccentric portion, the clearance groove has a first opening on the outer peripheral surface, and the oil groove has a second opening on the outer peripheral surface. Along the circumference of the eccentric portion, the angle β between the line connecting the center of the first opening to the center of the eccentric portion and the line connecting the center of the second opening to the center of the eccentric portion satisfies: 0≤β≤140°.

2. The crankshaft according to claim 1, characterized in that, The line segment group includes multiple line segments, which are arranged sequentially along the circumference of the eccentric portion.

3. The crankshaft according to claim 2, characterized in that, The distance L1 between the endpoints of each line segment and the center of the eccentric portion, and the diameter D of the eccentric portion, satisfy L1 < D.

4. The crankshaft according to claim 2, characterized in that, All the line segments are of equal length.

5. The crankshaft according to claim 2, characterized in that, The included angles between adjacent line segments are equal.

6. The crankshaft according to claim 1, characterized in that, The clearance groove is located on one side of the eccentric part, with the line connecting the center of the eccentric part to the center of the main shaft as the boundary.

7. The crankshaft according to claim 6, characterized in that, Along the circumferential direction of the eccentric portion, the two side walls of the clearance groove intersect the outer peripheral surface. The distance L2 between the projection points formed by the intersecting lines on the reference plane and the angle α between the projection points and the line connecting the center of the eccentric portion satisfy: 2*sin -1 (L2 / D)<α<170°, where D is the diameter of the eccentric part.

8. The crankshaft according to claim 1, characterized in that, The clearance groove extends through the eccentric portion along its axial direction.

9. The crankshaft according to claim 1, characterized in that, The crankshaft includes a plurality of eccentric portions arranged along the axial direction of the main shaft. Adjacent eccentric portions are arranged in a centrally symmetrical manner, and the clearance grooves of adjacent eccentric portions are respectively arranged on both sides of the line connecting the center of the eccentric portion to the center of the main shaft.

10. A compressor, characterized in that, The crankshaft includes any one of claims 1 to 9.

11. A refrigeration device, characterized in that, Includes the compressor as described in claim 10.

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