Crankshaft, pump body assembly and compressor

Abstract

The utility model relates to the technical field of compressors, and discloses a crankshaft. A tool withdrawal groove is formed in the outer surface of the crankshaft, a center oil hole extending in the axial direction is formed in the crankshaft, and the center oil hole comprises a first oil hole section and a second oil hole section. The second oil hole section is communicated with the first oil hole section; wherein the inner diameter of the second oil hole section is smaller than that of the first oil hole section, and the tool withdrawal groove is formed in the outer surface, corresponding to the second oil hole section, of the crankshaft. Center oil holes in the crankshaft are arranged in sections with different inner diameters, so that the thicknesses of the crankshafts corresponding to different oil hole sections are different. And the wall thickness of the crankshaft section corresponding to the second oil hole section is greater than that of the crankshaft section corresponding to the first oil hole section. The tool withdrawal groove is formed in the outer surface, corresponding to the second oil hole section with the relatively small inner diameter, of the crankshaft, namely the tool withdrawal groove is formed in the crankshaft section with the relatively large wall thickness, the groove thickness of the tool withdrawal groove can be increased, the strength of the crankshaft at the tool withdrawal groove can be enhanced, the structural strength of the crankshaft is improved, the reliability of the crankshaft is improved, and the service life of the crankshaft is prolonged. The utility model further discloses a pump body assembly and a compressor.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and in particular to a crankshaft, a pump body assembly and a compressor. Background Art

[0002] At present, with the upgrade of compressors, miniaturization and high speed have become the development direction of compressors. Increasing the maximum operating frequency of the compressor can achieve a smaller displacement and higher cooling capacity. However, high speed operation will bring problems such as friction and increased lubricating oil discharge.

[0003] The related technology sets a number of radial oil holes at different heights on the side wall of the center hole of the compressor crankshaft. The lubricating oil thrown out through the bottom radial oil hole lubricates the contact surface between the rotating lower end face of the compressor crankshaft and the upper end face of the lower bearing, and also plays a lubricating role at the junction of the piston and the lower bearing; the lubricating oil thrown out by the radial oil holes in the eccentric part of the compressor crankshaft lubricates the piston and the eccentric part of the compressor crankshaft, and the lubricating oil flowing downward lubricates the end face of the piston and the lubricating surface of the lower bearing; the lubricating oil thrown out from the radial oil holes at the upper bearing fills the back cutter groove on the compressor crankshaft; and a hollow conduit is installed at the topmost radial oil hole, and the lubricating oil is prevented from being discharged from the topmost radial oil hole by blocking the outer wall of the hollow conduit inside the center hole. Only refrigerant gas is discharged from the hollow conduit, which effectively reduces the oil load generated by the high speed of the rolling rotor compressor and reduces the oil discharge rate.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] Although the related technology can reduce the oil discharge rate at high speed of the compressor, the back-cut groove set on the outer surface of the side wall of the center hole will affect the overall structural strength of the crankshaft to a certain extent.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The disclosed embodiments provide a crankshaft and a compressor, so as to enhance the overall structural strength of the crankshaft while reducing the oil discharge rate.

[0009] According to a first aspect of an embodiment of the utility model, a crankshaft is provided, wherein an outer surface of the crankshaft is provided with a tool withdrawal groove, and an interior of the crankshaft is provided with a central oil hole extending axially, wherein the central oil hole comprises: a first oil hole section; and a second oil hole section connected to the first oil hole section; wherein the inner diameter of the second oil hole section is smaller than the inner diameter of the first oil hole section, and the tool withdrawal groove is opened on the outer surface of the crankshaft corresponding to the second oil hole section.

[0010] Optionally, the crankshaft includes: a short shaft; a long shaft, which is coaxially arranged with the short shaft; wherein the first oil hole section is arranged inside the short shaft, the second oil hole section is arranged inside the long shaft, and the backing groove is opened on the outer surface of the long shaft.

[0011] Optionally, the inner diameter of the first oil hole section is X1, the outer diameter of the short axis is X2, the inner diameter of the second oil hole section is Y1, the outer diameter of the long axis is Y2, X2-X1≥3mm, Y2-Y1≥4mm.

[0012] Optionally, the ratio of the outer diameter of the short shaft to the outer diameter of the long shaft is in the range of 0.8≤X2 / Y2≤1; and / or, the ratio of the inner diameter of the first oil hole section to the outer diameter of the short shaft is in the range of 0.4≤X1 / X2≤0.6; and / or, the ratio of the inner diameter of the second oil hole section to the outer diameter of the long shaft is in the range of 0.2≤Y1 / Y2≤0.4.

[0013] Optionally, the central oil hole further includes: a third oil hole segment, one end of which is connected to the first oil hole segment and the other end of which is connected to the second oil hole segment; wherein the inner diameter of the third oil hole segment is smaller than the inner diameter of the first oil hole segment and larger than the inner diameter of the second oil hole segment.

[0014] Optionally, when the crankshaft includes a short shaft and a long shaft, the crankshaft also includes: an eccentric portion, connected between the short shaft and the long shaft, a second oil hole section is provided inside the long shaft at the connection with the eccentric portion, and a third oil hole section is provided inside the eccentric portion and extends along the axial direction of the crankshaft; wherein the backing groove is opened on the outer surface of the connection between the long shaft and the eccentric portion.

[0015] Optionally, the center oil hole also includes: a fourth oil hole section, which is connected to the first end of the second oil hole section, and the second end of the second oil hole section is connected to the first oil hole section; wherein the inner diameter of the fourth oil hole section is smaller than the inner diameter of the second oil hole section; when the crankshaft includes a short shaft and a long shaft, the fourth oil hole section is arranged inside the long shaft.

[0016] According to a second aspect of an embodiment of the utility model, a pump body assembly is provided, comprising a crankshaft as described in any one of the above embodiments.

[0017] According to a third aspect of an embodiment of the utility model, a compressor is provided, comprising a pump body assembly as described in the above embodiment.

[0018] Optionally, the compressor also includes: a shell, which encloses an internal space and has an oil pool at the bottom; wherein the pump body assembly is arranged in the internal space, the first oil hole section is located on the side of the crankshaft close to the oil pool, and the second oil hole section is located on the side of the crankshaft away from the oil pool.

[0019] Optionally, the compressor comprises a high speed compressor having an operating frequency greater than or equal to 140 Hz.

[0020] The crankshaft, pump assembly and compressor provided by the embodiments of the present disclosure can achieve the following technical effects:

[0021] The central oil hole inside the crankshaft is divided into sections with different inner diameters, so that the crankshaft thickness corresponding to different oil hole sections is different. The inner diameter of the second oil hole section is smaller than the inner diameter of the first oil hole section, so the wall thickness of the crankshaft section corresponding to the second oil hole section is greater than the wall thickness of the crankshaft section corresponding to the first oil hole section. The undercut groove is set on the outer surface of the crankshaft corresponding to the second oil hole section with a relatively small inner diameter, that is, the undercut groove is set on the crankshaft section with a relatively large wall thickness, which can increase the groove thickness of the undercut groove, strengthen the crankshaft strength at the undercut groove, effectively improve the structural strength of the crankshaft, and thus enhance the reliability and life of the crankshaft.

[0022] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0024] Figure 1 is a schematic structural diagram of a crankshaft provided by an embodiment of the present disclosure;

[0025] Figure 2 is a schematic structural diagram of another crankshaft provided by an embodiment of the present disclosure;

[0026] Figure 3 is a schematic structural diagram of another crankshaft provided in an embodiment of the present disclosure;

[0027] Figure 4 is a schematic structural diagram of a pump assembly provided by an embodiment of the present disclosure;

[0028] Figure 5 is a structural schematic diagram of a compressor provided by an embodiment of the present disclosure;

[0029] Figure 6 is a schematic structural diagram of a main bearing provided by an embodiment of the present disclosure;

[0030] Figure 7is a schematic structural diagram of a secondary bearing provided by an embodiment of the present disclosure;

[0031] Figure 8 is a structural schematic diagram of an eccentric portion provided by an embodiment of the present disclosure;

[0032] Fig. 9 It is a schematic structural diagram of another eccentric portion provided in an embodiment of the present disclosure.

[0033] Reference numerals:

[0034] 10: crankshaft; 11: undercut groove; 12: short shaft; 13: long shaft; 14: eccentric portion; 141: first eccentric portion; 142: second eccentric portion; 143: through hole;

[0035] 20: center oil hole; 21: first oil hole section; 22: second oil hole section; 23: third oil hole section; 24: fourth oil hole section;

[0036] 30: shell; 31: internal space;

[0037] 40: Oil pool;

[0038] 50: pump body assembly;

[0039] 60: Main bearing;

[0040] 70: auxiliary bearing. DETAILED DESCRIPTION

[0041] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0042] The terms "first", "second", etc. in the specification and claims of the disclosed embodiments and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate for the disclosed embodiments described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0043] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0044] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0045] Unless otherwise stated, the term "plurality" means two or more.

[0046] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0047] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0048] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0049] At present, with the upgrade of compressors, miniaturization and high speed have become the development direction of compressors. Increasing the maximum operating frequency of the compressor can achieve a smaller displacement and higher cooling capacity. However, high speed operation will bring problems such as friction and increased lubricating oil discharge.

[0050] Although the related technology can reduce the oil discharge rate at high speed of the compressor, the back-cut groove set on the outer surface of the side wall of the center hole will affect the overall structural strength of the crankshaft to a certain extent.

[0051] Combination Figure 1-3As shown, the embodiment of the present disclosure provides a crankshaft 10, the outer surface of the crankshaft 10 is provided with a tool retreat groove 11, the crankshaft 10 is provided with a central oil hole 20 extending axially inside, the central oil hole 20 includes a first oil hole section 21 and a second oil hole section 22; the second oil hole section 22 is connected to the first oil hole section 21; wherein, the inner diameter of the second oil hole section 22 is smaller than the inner diameter of the first oil hole section 21, and the tool retreat groove 11 is opened on the outer surface of the crankshaft 10 corresponding to the second oil hole section 22.

[0052] Using the crankshaft 10 provided by the embodiment of the present disclosure, the central oil hole 20 inside the crankshaft 10 is divided into sections with different inner diameters, so that the thickness of the crankshaft 10 corresponding to different oil hole sections is different. The inner diameter of the second oil hole section 22 is smaller than the inner diameter of the first oil hole section 21, so the wall thickness of the crankshaft 10 section corresponding to the second oil hole section 22 is greater than the wall thickness of the crankshaft 10 section corresponding to the first oil hole section 21. The undercut groove 11 is arranged on the outer surface of the crankshaft 10 corresponding to the second oil hole section 22 with a relatively small inner diameter, that is, the undercut groove 11 is arranged on the crankshaft 10 section with a relatively large wall thickness, which can increase the groove thickness of the undercut groove 11, strengthen the strength of the crankshaft 10 at the undercut groove 11, effectively improve the structural strength of the crankshaft 10, and thus enhance the reliability and life of the crankshaft 10.

[0053] Optionally, combined Figure 1-3 As shown, the crankshaft 10 includes a short shaft 12 and a long shaft 13 ; the long shaft 13 is coaxially arranged with the short shaft 12 ; wherein the first oil hole section 21 is arranged inside the short shaft 12 , the second oil hole section 22 is arranged inside the long shaft 13 , and the back cutter groove 11 is opened on the outer surface of the long shaft 13 .

[0054] The simulation experiment found that the undercut 11 arranged at the position of the long axis 13 is more fragile than the short axis 12 . Therefore, the second oil hole section 22 with a smaller inner diameter is arranged inside the long axis 13 to focus on thickening the undercut 11 of the long axis 13 .

[0055] In the compressor, the oil is first pumped into the short shaft 12 end of the crankshaft 10, and then flows to the long shaft 13 end through the central oil hole 20, and the oil gradually decreases along the extension direction of the short shaft 12 toward the long shaft 13. Therefore, according to the flow of oil at different positions in the central oil hole 20, the first oil hole section 21 with a larger inner diameter is set inside the short shaft 12, and the second oil hole section 22 with a smaller inner diameter is set inside the long shaft 13, so that the first oil hole section 21 with a large inner diameter does not pass through the undercut 11 of the long shaft 13. While enhancing the strength of the undercut 11 of the long shaft 13, it can also ensure the normal circulation of oil in the crankshaft 10 and provide necessary lubrication for the crankshaft 10.

[0056] It can be understood that the first oil hole section 21 is arranged inside the short shaft 12 and can also extend to the inside of the long shaft 13 to be connected with the second oil hole section 22 arranged inside the long shaft 13, as long as the retreat groove 11 is opened on the outer surface of the long shaft 13 corresponding to the second oil hole section 22.

[0057] Optionally, combined Figure 1 As shown, the inner diameter of the first oil hole section 21 is X1, the outer diameter of the short axis 12 is X2, the inner diameter of the second oil hole section 22 is Y1, the outer diameter of the long axis 13 is Y2, X2-X1≥3mm, Y2-Y1≥4mm.

[0058] The disclosed embodiment limits the range of the difference between the outer diameter X2 of the short shaft 12 and the inner diameter X1 of the first oil hole section 21 to X2-X1≥3mm, that is, the wall thickness of the short shaft 12 is limited to be greater than or equal to 3mm, which can ensure the strength of the short shaft 12. The disclosed embodiment limits the range of the difference between the outer diameter Y2 of the long shaft 13 and the inner diameter Y1 of the second oil hole section 22 to Y2-Y1≥4mm, that is, the wall thickness of the long shaft 13 is limited to be greater than or equal to 4mm, which can ensure the strength of the short shaft 12. X2-X1≥3mm, Y2-Y1≥4mm can ensure the strength of the crankshaft 10 as a whole. Since the long shaft 13 plays a major supporting role and is subjected to greater force, the minimum value of the wall thickness of the long shaft 13 is greater than the minimum value of the wall thickness of the short shaft 12.

[0059] Optionally, combined Figure 1 As shown, the ratio of the outer diameter of the short axis 12 to the outer diameter of the long axis 13 is in the range of 0.8≤X2 / Y2≤1.

[0060] When the ratio X2 / Y2 of the outer diameter of the short axis 12 to the outer diameter of the long axis 13 is greater than or equal to 0.8, the strength of the short axis 12 can be enhanced to prevent the short axis 12 from breaking or deforming.

[0061] When the ratio X2 / Y2 of the outer diameter of the short shaft 12 to the outer diameter of the long shaft 13 is less than or equal to 1, the outer diameter of the short shaft 12 can be made smaller than the outer diameter of the long shaft 13, so that the supporting strength of the long shaft 13 is greater than the supporting strength of the short shaft 12. Since the long shaft 13 plays a major supporting role, the dynamic balance of the crankshaft 10 can be ensured in this way.

[0062] The disclosed embodiment limits the ratio range of the outer diameter of the short shaft 12 to the outer diameter of the long shaft 13 to 0.8≤X2 / Y2≤1. For high-speed operation, the ratio of the outer diameter of the short shaft 12 to the outer diameter of the long shaft 13 is made closer to 1, which can improve the rigidity of the crankshaft 10 and reduce vibration.

[0063] Optionally, combined Figure 1 As shown, the ratio of the inner diameter of the first oil hole section 21 to the outer diameter of the short shaft 12 is in the range of 0.4≤X1 / X2≤0.6.

[0064] The inner diameter of the first oil hole section 21 needs to be large enough to ensure that the lubricating oil can flow smoothly and provide sufficient lubrication for the short shaft 12 and the bearing. When the first oil hole section 21 is less than or equal to 0.6, the structural strength of the short shaft 12 can be guaranteed. When the first oil hole section 21 is greater than or equal to 0.4, the smaller the outer diameter of the short shaft 12 can be relatively reduced on the basis of meeting the reliability, thereby reducing the outer surface area of ​​the short shaft 12. During the rotation of the crankshaft 10, the friction power consumption of the outer surface of the short shaft 12 can be reduced, thereby improving the energy efficiency of the compressor. Therefore, the ratio range of the inner diameter of the first oil hole section 21 to the outer diameter of the short shaft 12 is limited to 0.4≤X1 / X2≤0.6 to achieve a balance between lubrication effect and structural strength.

[0065] Optionally, combined Figure 1 As shown, the ratio of the inner diameter of the second oil hole section 22 to the outer diameter of the major axis 13 is in the range of 0.2≤Y1 / Y2≤0.4.

[0066] The inner diameter of the second oil hole section 22 needs to be large enough to ensure that the lubricating oil can flow smoothly from the first oil hole section 21 into the second oil hole section 22, providing sufficient lubrication for the long shaft 13 and the bearing. When Y1 / Y2 is less than or equal to 0.4, the inner diameter of the second oil hole section 22 can be prevented from being too large, thereby ensuring the structural strength of the long shaft 13. When Y1 / Y2 is greater than or equal to 0.2, the outer diameter of the long shaft 13 can be relatively reduced on the basis of meeting the reliability, thereby reducing the outer surface area of ​​the long shaft 13. During the rotation of the crankshaft 10, the friction power consumption of the outer surface of the long shaft 13 can be reduced, thereby improving the energy efficiency of the compressor. Therefore, the ratio range of the inner diameter of the second oil hole section 22 to the outer diameter of the long shaft 13 is limited to 0.2≤Y1 / Y2≤0.4, achieving a balance between lubrication effect and structural strength. The first oil hole section 21 is the large inner diameter section of the center oil hole 20, and the second oil hole section 22 is the small inner diameter section of the center oil hole 20. Therefore, the limited value of the ratio Y1 / Y2 of the inner diameter of the second oil hole section 22 to the outer diameter of the major axis 13 is smaller than the limited value X1 / X2 of the ratio of the inner diameter of the first oil hole section 21 to the outer diameter of the minor axis 12.

[0067] When the inner diameter X1 of the first oil hole section 21 is 6mm, the outer diameter X2 of the short axis 12 is 12.5mm, the inner diameter Y1 of the second oil hole section 22 is 4mm, and the outer diameter Y2 of the long axis 13 is 14.5mm, the embodiment of the present disclosure sets the undercut groove 11 of the long axis 13 on the outer surface of the long axis 13 corresponding to the second oil hole section 22. After simulation experiments, the deformation of the long axis 13 of the crankshaft 10 is 1.4μ. In the original scheme, the first oil hole section 21 extends to the inside of the long axis 13, and the inner diameter of the center oil hole corresponding to the undercut groove 11 of the long axis 13 is 6mm. At this time, the deformation of the long axis 13 of the crankshaft 10 reaches 3.6μ. It can be seen from the simulation experiment structure that setting the undercut groove 11 on the outer surface of the long axis 13 corresponding to the second oil hole section 22 of the small inner diameter section can effectively reduce the deformation of the long axis 13.

[0068] Optionally, combined Figure 2 As shown, the central oil hole 20 also includes a third oil hole section 23; one end of the third oil hole section 23 is connected to the first oil hole section 21, and the other end is connected to the second oil hole section 22; wherein, the inner diameter of the third oil hole section 23 is smaller than the inner diameter of the first oil hole section 21 and larger than the inner diameter of the second oil hole section 22.

[0069] Since the oil gradually decreases along the extension direction of the short axis 12 toward the long axis 13, the central oil hole 20 is set to have multiple sections with different inner diameters, and the third oil hole section 23 is set between the first oil hole section 21 and the second oil hole section 22 to gradually reduce the inner diameter of the oil hole. The inner diameters of the first oil hole section 21, the third oil hole section 23, and the second oil hole section 22 are gradually reduced, which can ensure the normal circulation of the oil and reduce the inner diameter of the central oil hole 20 as much as possible, thereby enhancing the overall strength of the crankshaft 10. At the same time, the undercut 11 is set on the outer surface of the crankshaft 10 corresponding to the second oil hole section 22 with the smallest inner diameter, which can also enhance the strength of the undercut 11.

[0070] The embodiment of the present disclosure takes the central oil hole 20 of the crankshaft 10 as an example of a three-stage structure with gradually decreasing inner diameter. It is understandable that the central oil hole 20 can also be set to a four-stage, five-stage or other structure with more stages. The inner diameter of the central oil hole 20 can also be reduced in a non-stepwise manner, as long as the oil hole section corresponding to the undercut groove 11 adopts a relatively small inner diameter section or a medium inner diameter section, so that the thickness of the undercut groove 11 can be enhanced.

[0071] Optionally, combined Figure 1-2 As shown, when the crankshaft 10 includes a short shaft 12 and a long shaft 13, the crankshaft 10 also includes an eccentric portion 14; the eccentric portion 14 is connected between the short shaft 12 and the long shaft 13, and a second oil hole section 22 is provided inside the long shaft 13 at the connection with the eccentric portion 14, and a third oil hole section 23 is provided inside the eccentric portion 14 and extends along the axial direction of the crankshaft 10; wherein, the backing groove 11 is opened on the outer surface of the connection between the long shaft 13 and the eccentric portion 14.

[0072] The first oil hole section 21 is provided on the short shaft 12, the second oil hole section 22 is provided on the long shaft 13, and the first oil hole section 21, the second oil hole section 22, and the third oil hole section 23 extend in the axial direction. The third oil hole section 23 is provided between the first oil hole section 21 and the second oil hole section 22, and can be provided on the short shaft 12, the long shaft 13, or the eccentric portion 14.

[0073] According to simulation experiments, the undercut groove 11 at the root of the long shaft 13 where the long shaft 13 and the eccentric part 14 are connected is the most fragile and easy to break, therefore, the second oil hole section 22 is provided on the long shaft 13 and extends to the root of the long shaft 13, which can ensure the thickness of the undercut groove 11 at the root of the long shaft 13. The second oil hole section 22 is connected to the third oil hole section 23, and the third oil hole section 23 is provided on the eccentric part 14, which can prevent the middle inner diameter section from passing through the undercut groove 11, and enhance the strength of the eccentric part 14 without affecting the thickness of the undercut groove 11, thereby enhancing the overall strength of the crankshaft 10.

[0074] Optionally, combined Figure 1-2 As shown, the eccentric portion 14 includes a first eccentric portion 141 and a second eccentric portion 142, the first eccentric portion 141 is arranged close to the major axis 13; the second eccentric portion 142 is connected to the first eccentric portion 141 and is arranged close to the minor axis 12; wherein, the back cutter groove 11 is opened on the outer surface of the connection between the major axis 13 and the first eccentric portion 141, and the third oil hole section 23 is arranged between the back cutter groove 11 and the second eccentric portion 142.

[0075] The third oil hole section 23 is a middle inner diameter section, and is disposed between the undercut groove 11 and the second eccentric portion 142, so as to better ensure the thickness of the undercut groove 11 and the overall strength of the crankshaft 10. Taking the crankshaft 10 placed vertically as an example, the third oil hole section 23 is disposed between the undercut groove 11 and the second eccentric portion 142, which means that the position of the third oil hole section 23 is lower than the lower surface of the undercut groove 11 and higher than the upper surface of the second eccentric portion 142.

[0076] Optionally, the first eccentric portion 141 and / or the second eccentric portion 142 is provided with a through hole 143 , and the through hole 143 is opened along the axial direction.

[0077] By providing the through hole 143 in the first eccentric portion 141 and / or the second eccentric portion 142, the mass of the first eccentric portion 141 and / or the second eccentric portion 142 can be reduced. The lightweight eccentric portion can reduce the vibration caused by the rotation of the crankshaft 10 due to its smaller inertia, thereby reducing the risk of fatigue damage in the area of ​​the undercut 11 of the long shaft 13. At the same time, reducing the mass of the first eccentric portion 141 and / or the second eccentric portion 142 helps to improve the dynamic balance performance of the crankshaft 10, thereby reducing the additional load caused by imbalance, which helps to reduce the stress concentration in the area of ​​the undercut 11.

[0078] Alternatively, if Figure 8 As shown, the through holes 143 may be a plurality of circular holes opened along the axial direction.

[0079] Alternatively, if Fig. 9 As shown, the through hole 143 may also be an arc-shaped through hole opened along the axial direction.

[0080] It is understandable that the through hole 143 may also be opened along other directions.

[0081] Optionally, combined Figure 3 As shown, the center oil hole 20 also includes a fourth oil hole segment 24, which is connected to the first end of the second oil hole segment 22, and the second end of the second oil hole segment 22 is connected to the first oil hole segment 21; wherein, the inner diameter of the fourth oil hole segment 24 is smaller than the inner diameter of the second oil hole segment 22; when the crankshaft 10 includes a short shaft 12 and a long shaft 13, the fourth oil hole segment 24 is arranged inside the long shaft 13.

[0082] The inner diameter of the center oil hole 20 corresponding to the backhoe groove 11 can be a small inner diameter section or a medium inner diameter section. As long as the inner diameter of the center oil hole 20 corresponding to the backhoe groove 11 is smaller than the maximum inner diameter section of the first oil hole section 21, the thickness of the backhoe groove 11 can be enhanced to a certain extent.

[0083] The disclosed embodiment is provided with a fourth oil hole section 24 having an inner diameter smaller than that of the second oil hole section 22. The fourth oil hole section 24 is provided on the long axis 13 and is located on the side of the second oil hole section 22 away from the first oil hole section 21, so that the inner diameter of the central oil hole 20 is gradually reduced. At this time, the second oil hole section 22 is used as a middle inner diameter section. Since the inner diameter of the second oil hole section 22 is smaller than that of the first oil hole section 21, the undercut groove 11 is provided on the outer surface of the crankshaft 10 of the middle inner diameter section corresponding to the second oil hole section 22, which can also prevent the first oil hole section 21 with a large inner diameter from passing through the undercut groove 11 of the long axis 13, thereby enhancing the strength of the undercut groove 11.

[0084] Combination Figure 4 As shown, an embodiment of the present disclosure provides a pump body assembly 50, comprising a crankshaft 10 as described in any of the above embodiments.

[0085] The pump body assembly 50 provided in the embodiment of the present disclosure includes the crankshaft 10 described in any one of the above embodiments, and thus has all the beneficial effects of the crankshaft 10 described in any one of the above embodiments, which will not be described in detail here.

[0086] Optionally, combined Figure 4 and Figure 6-7 As shown, the pump body assembly 50 also includes a main bearing 60 and a secondary bearing 70. When the crankshaft 10 includes a long shaft 13 and a short shaft 12, the main bearing 60 is sleeved on the outside of the long shaft 13, and the secondary bearing 70 is sleeved on the outside of the short shaft 12, wherein the contact length between the main bearing 60 and the long shaft 13 is M (as shown in FIG. Figure 6 As shown), the contact length between the secondary bearing 70 and the short shaft 12 is N (as shown Figure 7 As shown), 0.6≤N / M≤0.8.

[0087] Good lubrication between the main bearing 60 and the auxiliary bearing 70 and the crankshaft 10 can reduce the friction between the main bearing 60 and the auxiliary bearing 70 and the crankshaft 10 , reduce thermal stress and wear, and thus avoid affecting the strength of the back cutter groove 11 provided on the crankshaft 10 .

[0088] The disclosed embodiment limits the ratio range of the contact length N between the secondary bearing 70 and the short shaft 12 and the contact length M between the main bearing 60 and the long shaft 13 to 0.6≤N / M≤0.8. By increasing the height of the secondary bearing 70, a better supporting area can be provided for the short shaft 12, thereby reducing the swing of the long shaft 13, effectively improving the oil film thickness between the crankshaft 10 and the main bearing 60 and the secondary bearing 70, and improving the stability of the oil film thickness, thereby improving the lubrication effect between the main bearing 60 and the long shaft 13, and between the secondary bearing 70 and the short shaft 12, thereby avoiding the influence of wear on the strength of the back cutter groove 11.

[0089] Combination Figure 5 As shown, an embodiment of the present disclosure provides a compressor, characterized in that it includes the pump body assembly 50 described in the above embodiment.

[0090] The compressor provided in the embodiment of the present disclosure includes the pump body assembly 50 described in the above embodiment, and thus has all the beneficial effects of the pump body assembly 50 described in the above embodiment, which will not be described in detail here.

[0091] Optionally, the compressor also includes a shell 30, which encloses an internal space 31 and has an oil pool 40 at the bottom; wherein the pump body assembly 50 is arranged in the internal space 31, the first oil hole section 21 is located on the side of the crankshaft 10 close to the oil pool 40, and the second oil hole section 22 is located on the side of the crankshaft 10 away from the oil pool 40.

[0092] The first oil hole section 21 is the large inner diameter section of the center oil hole 20, and the second oil hole section 22 is the small inner diameter section of the center oil hole 20. The first oil hole section 21 is arranged on the side of the crankshaft 10 close to the oil pool 40, and the second oil hole section 22 is arranged on the side of the crankshaft 10 away from the oil pool 40. This ensures that the inner diameter of the center oil hole 20 close to the oil pool 40 is larger, and the amount of oil pumped into the center oil hole 20 is guaranteed. Since the oil lubricates various parts of the crankshaft 10 during the flow process, coupled with the effect of gravity, the oil in the center oil hole 20 becomes less and less along the direction of the crankshaft 10 away from the oil pool 40. Therefore, the inner diameter of the center oil hole 20 away from the oil pool 40 is set to be smaller, which does not affect the flow of the oil and can also enhance the strength of the crankshaft 10.

[0093] Optionally, the compressor comprises a high speed compressor having an operating frequency greater than or equal to 140 Hz.

[0094] When the compressor is running at high speed, the thickness of the undercut 11 has a more obvious effect on the strength of the crankshaft 10. The disclosed embodiment controls the maximum operating frequency range of the compressor to ≥140Hz, which can form a high-speed environment. The crankshafts 10 involved in the above embodiments are all suitable for high-speed compressors, which can solve the problem of the fragility of the undercut 11 of the crankshaft 10 at high speeds.

[0095] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A crankshaft, characterized in that: The outer surface of the crankshaft is provided with a tool-relief groove, and the interior of the crankshaft is provided with a central oil hole extending in the axial direction, and the central oil hole includes: first oil hole section; A second oil hole section, connected to the first oil hole section; The inner diameter of the second oil hole section is smaller than the inner diameter of the first oil hole section, and the backing groove is arranged on the outer surface of the crankshaft corresponding to the second oil hole section.

2. The crankshaft according to claim 1, characterized in that include: Short axis; A major axis is coaxially arranged with the minor axis; The first oil hole section is arranged inside the short shaft, the second oil hole section is arranged inside the long shaft, and the backing groove is arranged on the outer surface of the long shaft.

3. The crankshaft according to claim 2, characterized in that The inner diameter of the first oil hole section is X1, and the outer diameter of the short axis is X2. The inner diameter of the second oil hole section is Y1, and the outer diameter of the long axis is Y2. X2-X1≥3mm, and Y2-Y1≥4mm.

4. The crankshaft according to claim 2, characterized in that The ratio of the outer diameter of the minor axis to the outer diameter of the major axis is in the range of 0.8≤X2 / Y2≤1; and / or, The ratio of the inner diameter of the first oil hole section to the outer diameter of the short shaft is in the range of 0.4≤X1 / X2≤0.6; and / or, The ratio of the inner diameter of the second oil hole section to the outer diameter of the major axis is in the range of 0.2≤Y1 / Y2≤0.

4.

5. The crankshaft according to any one of claims 1 to 4, characterized in that: The center oil hole also includes: A third oil hole segment, one end of which is connected to the first oil hole segment, and the other end of which is connected to the second oil hole segment; The inner diameter of the third oil hole section is smaller than the inner diameter of the first oil hole section and larger than the inner diameter of the second oil hole section.

6. The crankshaft according to claim 5, characterized in that In the case where the crankshaft includes a short shaft and a long shaft, the crankshaft also includes: The eccentric part is connected between the short shaft and the long shaft, a second oil hole section is provided inside the long shaft at the connection with the eccentric part, and a third oil hole section is provided inside the eccentric part and extends along the axial direction of the crankshaft; Wherein, the tool withdrawal groove is arranged on the outer surface of the connection between the long shaft and the eccentric part.

7. The crankshaft according to any one of claims 1 to 4, characterized in that: The center oil hole also includes: a fourth oil hole segment, connected to the first end of the second oil hole segment, and a second end of the second oil hole segment connected to the first oil hole segment; wherein the inner diameter of the fourth oil hole segment is smaller than the inner diameter of the second oil hole segment; In the case where the crankshaft includes a short shaft and a long shaft, the fourth oil hole section is arranged inside the long shaft.

8. A pump assembly, characterized in that: Comprising a crankshaft as claimed in any one of claims 1 to 7.

9. A compressor, characterized in that: Comprising the pump body assembly as claimed in claim 8.

10. The compressor according to claim 9, characterized in that Also includes: The shell encloses an internal space and has an oil pool at the bottom; The pump body assembly is arranged in the internal space, the first oil hole section is located on the side of the crankshaft close to the oil pool, and the second oil hole section is located on the side of the crankshaft away from the oil pool.

11. The compressor according to any one of claims 9 or 10, characterized in that: The compressor includes a high speed compressor having an operating frequency greater than or equal to 140 Hz.

Images