Crankshaft, pump body assembly, and compressor

Abstract

The utility model provides a kind of crankshaft, pump body assembly and compressor.The crankshaft includes long axle part, eccentric part and short axle part sequentially arranged along the axial direction, at least one convex structure is equipped on the outer wall surface of the short axle part, the convex structure includes fitting part and protruding part, the fitting part is compatible with the outer wall surface of the short axle part, the protruding part extends outward towards the direction of the outer wall surface of the short axle part, and the protruding part is inclined in the same direction as the rotation direction of the crankshaft.The utility model sets protruding structure on short axle part, and the protruding part of protruding structure is inclined in the same direction as the rotation direction of the crankshaft, the setting of protruding part can improve the power of crankshaft pumping lubricating oil, to improve the amount of lubricating oil in the oil circuit of pump oil assembly, increase the lubricating oil amount of blade, reduce friction loss, improve the performance and reliability of compressor, improve low-speed noise problem.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, specifically to a crankshaft, pump body assembly, and compressor. Background Technology

[0002] The crankshaft oil pump in a compressor is one of the core lubrication mechanisms ensuring the normal operation of the compressor. Its principle is to utilize the "centrifugal force" and "pressure difference" generated when the crankshaft rotates to deliver lubricating oil to various friction pairs (such as crankshaft journals, upper and lower cylinder heads, cylinders, etc.). Compared with other friction pairs, the friction loss of the blades accounts for the largest proportion of power consumption. Furthermore, the friction loss on the blade sides is the largest compared to the blade tips and end faces, severely limiting the compressor's energy efficiency.

[0003] Currently, the lubrication of mass-produced blades is mainly divided into two types: passive lubrication and active lubrication. Passive lubrication refers to the self-lubrication of oil in the oil sump by the blade movement. This lubrication method can lead to poor oil film formation and insufficient blade lubrication when the oil level is low or when there is particularly violent oscillation, resulting in high wear and a clicking noise problem. Active lubrication refers to the use of pumped oil to guide the flow through an oil circuit. However, this pumping method of active lubrication suffers from insufficient pumping power, especially at low speeds. The pumping power is weak, and the upward pumping power is insufficient, which is not conducive to the upward pumping of lubricating oil. Utility Model Content

[0004] To address the problems in the existing technology, the purpose of this utility model is to provide a crankshaft, pump body assembly, and compressor to improve the problem of low pumping power during active pump lubrication.

[0005] This utility model embodiment provides a crankshaft, including a long shaft portion, an eccentric portion, and a short shaft portion arranged sequentially along the axial direction. The outer wall surface of the short shaft portion is provided with at least one protrusion structure, the protrusion structure including a fitting portion and a protruding portion. The fitting portion is adapted to the outer wall surface of the short shaft portion, and the protruding portion extends outward in a direction opposite to the outer wall surface of the short shaft portion, and the protruding portion is inclined in the same direction as the rotation direction of the crankshaft.

[0006] In some embodiments, a plurality of protrusions are provided on the outer wall surface of the short shaft portion, and the plurality of protrusions are arranged circumferentially along the outer wall surface of the short shaft portion.

[0007] In some embodiments, the plurality of protrusions are arranged symmetrically or asymmetrically.

[0008] In some embodiments, the distance from the end of the protrusion structure away from the short shaft portion to the rotation center of the crankshaft is H, the radius of the short shaft portion is R1, and the outer diameter of the flexible groove of the lower cylinder head of the compressor is R2, satisfying: 4 / 3R1<H<R2.

[0009] In some embodiments, the protrusion includes a windward surface, which is a side facing the rotation direction of the crankshaft, and the angle between the windward surface and the radial direction of the crankshaft is α, satisfying: 0° < α < 60°.

[0010] In some embodiments, the windward surface is a plane or a curved surface.

[0011] In some embodiments, the crankshaft further includes a central through hole that passes through the long shaft portion, the eccentric portion, and the short shaft portion; the side wall of the short shaft portion is provided with an oil outlet hole that communicates with the central through hole.

[0012] This utility model embodiment also provides a pump body assembly, including a cylinder, an upper cylinder head, a lower cylinder head, a piston, and a crankshaft as described above. The upper cylinder head and the lower cylinder head are respectively disposed at both axial ends of the cylinder; the crankshaft passes through both ends of the cylinder; the piston is sleeved on the outside of the eccentric portion and located inside the cylinder.

[0013] In some embodiments, the lower cylinder head has a flexible groove extending through the axial direction of the lower cylinder head at its center, and the short shaft portion and the protruding structure are disposed within the flexible groove; the lower cylinder head has a first oil passage hole in its radial direction, and the flexible groove communicates with the first oil passage hole;

[0014] The cylinder has a cylinder cavity formed along its axial direction. The cylinder is provided with a vane groove that communicates with the cylinder cavity. A vane is provided in the vane groove. The cylinder is also provided with a second oil passage hole along its axial direction. The second oil passage hole communicates with the vane groove and the first oil passage hole.

[0015] This utility model embodiment also provides a compressor, including the pump body assembly as described in any of the preceding claims.

[0016] The crankshaft, pump body assembly, and compressor provided by this utility model have the following advantages:

[0017] By setting a protruding structure on the short shaft, and the protrusion of the protrusion is inclined in the same direction as the rotation direction of the crankshaft, the protrusion can improve the power of the crankshaft to pump lubricating oil, thereby increasing the amount of lubricating oil entering the oil circuit of the oil pump assembly, increasing the amount of lubricating oil in the blades, reducing friction loss, improving the performance and reliability of the compressor, and improving the low-speed noise problem. Attached Figure Description

[0018] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0019] Figure 1 This is a three-dimensional schematic diagram of a crankshaft provided in an embodiment of the present invention;

[0020] Figure 2 This is a cross-sectional schematic diagram of a crankshaft provided in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of a pump body assembly provided in an embodiment of the present invention;

[0022] Figure 4 This is a cross-sectional schematic diagram of a pump body assembly provided in an embodiment of the present invention;

[0023] Figure 5 This is a cross-sectional schematic diagram of a pump body assembly provided in another embodiment of the present invention.

[0024] Figure label:

[0025] 10 Crankshaft 21 Blade Groove

[0026] 11 Long shaft section 22 Second oil passage hole

[0027] 12 Eccentric part 30 Upper cylinder head

[0028] 13 Short shaft section 40 Lower cylinder head

[0029] 14 Protruding structure 41 Flexible groove

[0030] 141 Fitting part 42 First oil passage hole

[0031] 142 Protrusion 50 Piston

[0032] 20 cylinders Detailed Implementation

[0033] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0034] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples represented in this application, as well as features of different embodiments or examples.

[0035] Furthermore, the terms "first" and "second" are used for illustrative purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the representation of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] It should be further understood that the terms "comprising" or "including" indicate the presence of a feature, step, operation, element, component, item, kind, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" as used herein are interpreted as inclusive, or mean any one or any combination thereof. Therefore, "A, B, or C" or "A, B, and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A, B, and C." Exceptions to this definition only arise when a combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0037] Figure 1 A perspective view of a crankshaft provided in an embodiment of the present invention is shown; Figure 2 A cross-sectional schematic diagram of a crankshaft provided according to an embodiment of the present invention is shown. Figure 1 and Figure 2 As shown, the crankshaft 10 includes a long shaft portion 11, an eccentric portion 12, and a short shaft portion 13 arranged sequentially along the axial direction. At least one protrusion structure 14 is provided on the outer wall surface of the short shaft portion 13. The protrusion structure 14 includes a fitting portion 141 and a protrusion portion 142. The fitting portion 141 is adapted to the outer wall surface of the short shaft portion 13, and the protrusion portion 142 extends outward in the direction away from the outer wall surface of the short shaft portion 13. The protrusion portion 142 is inclined in the same direction as the rotation direction of the crankshaft 10.

[0038] By providing a protruding structure 14 on the short shaft portion 13, the protrusion 142 on the protruding structure 14 is inclined in the direction of rotation of the crankshaft 10. When the protrusion 142 rotates with the crankshaft 10, it can increase the power of the crankshaft 10 to pump lubricating oil, thereby increasing the amount of lubricating oil entering the oil circuit of the pump body assembly, increasing the amount of lubricating oil pumped into the blade groove, reducing the frictional loss of the blades, improving the performance and reliability of the compressor, and improving the low-speed noise problem.

[0039] Furthermore, this embodiment of the invention also provides a pump body assembly. Figure 3 A schematic diagram of a pump body assembly according to an embodiment of the present invention is shown. Figure 3 As shown, the pump body assembly includes a cylinder 20, an upper cylinder head 30, a lower cylinder head 40, a piston 50, and a crankshaft 10 as described in any of the above items. The upper cylinder head 30 and the lower cylinder head 40 are respectively located at the two axial ends of the cylinder 20. The crankshaft 10 extends through both ends of the cylinder 20. The piston is sleeved on the outside of the eccentric part 12 and located inside the cylinder 20.

[0040] The pump body assembly 100 includes the crankshaft 10 described above, and therefore all the technical effects of the crankshaft 10 described above can be obtained, which will not be repeated here.

[0041] The crankshaft provided in this embodiment of the present invention will be further described below in conjunction with the pump body assembly. Figure 4 A cross-sectional schematic diagram of a pump body assembly provided in an embodiment of the present invention is shown; Figure 5 A cross-sectional schematic diagram of a pump body assembly provided in another embodiment of the present invention is shown.

[0042] like Figure 4 As shown, only one protruding structure 14 is provided on the short shaft portion 13. Figure 5 As shown, in some other embodiments, a plurality of protrusions 14 are provided on the outer wall surface of the short shaft portion 13, and the plurality of protrusions 14 are arranged circumferentially along the outer wall surface of the short shaft portion 13. For example, as... Figure 5 As shown, two protruding structures 14 are provided on the outer wall surface of the short shaft portion 13, and the two protruding structures 14 are arranged circumferentially along the outer wall surface of the short shaft portion 13. Those skilled in the art can set the number of protruding structures 14 according to actual needs, and are not limited to the example in the above figures.

[0043] Furthermore, the plurality of protrusions 142 are arranged symmetrically or asymmetrically. For example, as shown... Figure 5 As shown, the two protrusions 14 on the short shaft portion 13 are symmetrically arranged. The symmetrical arrangement of multiple protrusions 14 can provide uniform pumping power during oil pumping, improving pumping stability. In other embodiments, when there are multiple protrusions 14, they can also be arranged asymmetrically to meet the power requirements during oil pumping.

[0044] Furthermore, such as Figure 4 As shown, the distance from the end of the protruding structure 14 away from the short shaft portion 13 to the rotation center of the crankshaft 10 is H, the radius of the short shaft portion 13 is R1, and the outer diameter of the flexible groove of the lower cylinder head 40 of the compressor is R2, satisfying: 4 / 3R1 < H < R2. By limiting the range of the distance H from the end of the protruding structure 14 away from the short shaft portion 13 to the rotation center of the crankshaft 10, the protruding structure 14 does not interfere with the flexible groove 41 of the lower cylinder head 40, and the requirement to increase the pumping power of the crankshaft 10 can be met.

[0045] Furthermore, such as Figure 2 As shown, the protrusion 142 includes a windward surface, which is the side facing the rotation direction of the crankshaft 10. The angle between the windward surface and the radial direction of the crankshaft 10 is α, which satisfies: 0° < α < 60°.

[0046] When exploring the range of the angle between the windward surface and the radial direction of the crankshaft 10, the inventor investigated the oil flow rate of the oil circuit for different angles α. Table 1 shows a comparison of the oil flow rate at the blade outlet of the pump body assembly in the prior art and the pump body assembly with different windward surface angles provided in the embodiment of this utility model.

[0047] Table 1 compares the oil flow rate at the blade outlet of the pump body assembly in the prior art with that of the pump body assembly with different windward angles provided in the embodiments of this utility model.

[0048]

[0049] According to Table 1, when the included angle α is negative, i.e., the windward surface of the protruding structure 14 is opposite to the rotation direction of the crankshaft 10, the design of the protruding structure 14 has virtually no effect on increasing the pumping oil volume compared to the pump body assembly in the prior art. When the included angle α is non-negative and increases, the pumping oil volume of the protruding structure 14 increases compared to the pump body assembly in the prior art. Therefore, by setting the included angle α between the windward surface and the radial direction of the crankshaft 10 within a range, the pumping capacity of the crankshaft 10 can be improved, thereby increasing the amount of lubricating oil pumped by the crankshaft 10.

[0050] Furthermore, the windward surface is either flat or curved. For example, such as... Figure 2 As shown, the windward surface in this embodiment is set as a plane. The specific structure of the windward surface can be set according to actual needs, and will not be described in detail here.

[0051] Further, please refer to Figure 3The crankshaft 10 also includes a central through-hole 15, which passes through the long shaft portion 11, the eccentric portion 12, and the short shaft portion 13. Oil outlet holes 16, which connect to the central through-hole, are provided on the side walls of the long shaft portion 11, the eccentric portion 12, and the short shaft portion 13. When the crankshaft 10 rotates, its internal axial oil passage (central through-hole 15) rotates synchronously with the crankshaft 10. Centrifugal force generates pressure in the oil passage, and under the pressure difference, the lubricating oil enters the central through-hole 15 from the oil inlet at the lower end of the crankshaft 10. It is then precisely delivered to the journals and other friction pairs of the crankshaft 10 through the radial oil outlet holes 16, lubricating each friction pair and reducing wear on the pump body components.

[0052] Please continue reading. Figures 3 to 5 In this embodiment, the lower cylinder head 40 has a flexible groove 41 that runs through the axial direction of the lower cylinder head at its center, and the short shaft portion 13 and the protruding structure 14 are disposed in the flexible groove 41; the lower cylinder head 40 has a first oil passage hole 42 in the radial direction, and the first oil passage hole 42 communicates with the flexible groove 41.

[0053] The cylinder 20 has a cylinder cavity formed along its axial direction. The cylinder 20 is provided with a vane groove 21 that connects to the cylinder cavity. A vane (not shown in the figure) is provided in the vane groove 21. The cylinder 20 is also provided with a second oil passage hole 22 along its axial direction. The second oil passage hole 22 connects the vane groove 21 and the first oil passage hole 42.

[0054] The working principle of the active lubrication vanes is as follows: When the crankshaft 10 rotates, the raised structure 14 can convert the kinetic energy of the crankshaft 10 into the power to push the lubricating oil flow, and under the action of centrifugal force, the lubricating oil is thrown into the oil passage of the lower cylinder head 40 (e.g., Figure 3 As shown by the arrow, lubricating oil enters the second oil passage 22 from the first oil passage 42 and is then pumped into the vane groove 21 to provide sufficient lubricating oil for the vane groove 21 and the vanes, thereby reducing frictional losses between the vanes and the cylinder 20, improving the energy efficiency of the pump body components, improving the performance and reliability of the compressor, and improving low-speed noise issues.

[0055] To further confirm the beneficial effects of the pump assembly provided in this embodiment of the present invention, a simulation experiment was conducted to compare the oil output of the pump assembly provided in this embodiment of the present invention with that of the active pumping oil flow path of the pump assembly blades in the prior art. Table 2 shows the comparison of the oil output of the pump assembly provided in this embodiment of the present invention with that of the active pumping oil flow path of the pump assembly blades in the prior art.

[0056] Table 2. The utility model provides the following: Figure 4 Pump body components, Figure 5 A comparison of the oil flow rate at the pump body assembly blade outlet with that of existing pump body assemblies.

[0057]

[0058] As shown in Table 2, compared to pump body assemblies in the prior art, the pump body assemblies provided in both embodiments of this utility model have increased oil flow rates at the blade outlets. Therefore, the increased oil flow rates at the blade outlets of the pump body assemblies provided in these embodiments can provide good lubrication for the blades, reduce frictional losses in the blade friction pairs, and thus improve the energy efficiency of the compressor.

[0059] Furthermore, this embodiment of the invention also provides a compressor, including the pump body assembly described above. Since the compressor includes the pump body assembly described above, it achieves all the technical effects of the aforementioned pump body assembly, which will not be elaborated further here.

[0060] In summary, the crankshaft, pump assembly, and compressor provided by this utility model have the following advantages:

[0061] By setting a protruding structure on the short shaft, and the protrusion of the protrusion is inclined in the same direction as the rotation direction of the crankshaft, the protrusion can improve the power of the crankshaft to pump lubricating oil, thereby increasing the amount of lubricating oil entering the oil circuit of the oil pump assembly, increasing the amount of lubricating oil in the blades, reducing friction loss, improving the performance and reliability of the compressor, and improving the low-speed noise problem.

[0062] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A crankshaft, comprising a long shaft portion, an eccentric portion, and a short shaft portion arranged sequentially along the axial direction, characterized in that, At least one protruding structure is provided on the outer wall surface of the short shaft portion. The protruding structure includes a fitting portion and a protruding portion. The fitting portion is adapted to the outer wall surface of the short shaft portion, and the protruding portion extends outward in a direction opposite to the outer wall surface of the short shaft portion. The protruding portion is inclined in the same direction as the rotation direction of the crankshaft.

2. The crankshaft according to claim 1, characterized in that, The outer wall surface of the short shaft portion is provided with a plurality of protruding structures, which are arranged circumferentially along the outer wall surface of the short shaft portion.

3. The crankshaft according to claim 2, characterized in that, The multiple protrusions are arranged symmetrically or asymmetrically.

4. The crankshaft according to claim 1, characterized in that, The distance from the end of the protruding structure away from the short shaft to the rotation center of the crankshaft is H, the radius of the short shaft is R1, and the outer diameter of the flexible groove of the lower cylinder head of the compressor is R2, satisfying: 4 / 3R1<H<R2.

5. The crankshaft according to claim 1, characterized in that, The protrusion includes a windward surface, which is the side facing the rotation direction of the crankshaft. The angle between the windward surface and the radial direction of the crankshaft is α, satisfying: 0° < α < 60°.

6. The crankshaft according to claim 5, characterized in that, The windward surface can be a flat or curved surface.

7. The crankshaft according to claim 1, characterized in that, The crankshaft also includes a central through hole, which passes through the long shaft portion, the eccentric portion, and the short shaft portion; the side wall of the short shaft portion is provided with an oil outlet hole that communicates with the central through hole.

8. A pump body assembly, characterized in that, The cylinder includes an upper cylinder head, a lower cylinder head, a piston, and a crankshaft as described in any one of claims 1 to 6, wherein the upper cylinder head and the lower cylinder head are respectively disposed at both axial ends of the cylinder; the crankshaft extends through both ends of the cylinder; and the piston is sleeved on the outside of the eccentric portion and located inside the cylinder.

9. The pump body assembly according to claim 8, characterized in that, The lower cylinder head has a flexible groove running through its axial direction at its center, and the short shaft portion and the protruding structure are located within the flexible groove; the lower cylinder head has a first oil passage hole in its radial direction, and the flexible groove connects to the first oil passage hole. The cylinder has a cylinder cavity formed along its axial direction. The cylinder is provided with a vane groove that communicates with the cylinder cavity. A vane is provided in the vane groove. The cylinder is also provided with a second oil passage hole along its axial direction. The second oil passage hole communicates with the vane groove and the first oil passage hole.

10. A compressor, characterized in that, Includes the pump body assembly as described in claim 9.

Images