Crankshaft and compressor
By setting an eccentric part and oil outlet hole on the compressor crankshaft and combining the groove design, the grinding problem when the crankshaft and the cylinder head bearing are solved, the lubrication effect is improved and the wear is reduced.
Patent Information
- Application Number
- CN202411830747.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-04-11
AI Technical Summary
The part of the long and short shafts of the compressor crankshaft that cooperate with the upper and lower cylinder head bearings is prone to bias wear, resulting in increased wear of the cylinder head and crankshaft side walls, and the lack of simple and effective technical solutions to solve this problem.
By providing an eccentric part on the long and short axis of the crankshaft, and an oil discharge hole is provided between the eccentric part and the long and short axis, a groove is provided on the circumferential surface of the crankshaft in conjunction with the groove design to improve the lubrication of the crankshaft journal and reduce the viscosity resistance of the oil film.
It effectively improves the lubrication level of the crankshaft eccentric part, reduces the viscosity resistance of the oil film, and reduces the wear of the cylinder head and crankshaft side walls.
Smart Images
Figure CN119801876A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of compressors, and in particular to a crankshaft and a compressor. Background Art
[0002] The long and short axes of the compressor crankshaft are prone to eccentric wear at the parts where they fit with the upper and lower cylinder head bearings, which can easily lead to increased wear of the cylinder head and the side walls of the crankshaft after long-term operation. The industry lacks a simple and effective technical solution to solve the above problem. Summary of the invention
[0003] The object of the present invention is to provide a crankshaft and a compressor, which improve the lubrication of the crankshaft journal through a slotted design and reduce the viscous resistance of the oil film.
[0004] To achieve the above-mentioned objectives, the present invention provides a crankshaft, comprising a short shaft, a long shaft and an eccentric portion, wherein the eccentric portion is arranged between the long shaft and the short shaft, a first oil outlet hole is arranged between the eccentric portion and the long shaft, and a second oil outlet hole is arranged between the eccentric portion and the short shaft; the long shaft is provided with a groove at one end of its circumferential surface close to the first oil outlet hole, and\or the short shaft is provided with the groove at one end of its circumferential surface close to the second oil outlet hole.
[0005] Optionally, the groove passes through one end of the major axis on its circumferential surface close to the first oil outlet hole, and / or, the groove passes through one end of the minor axis on its circumferential surface close to the second oil outlet hole.
[0006] Optionally, in a cross section along the radial direction of the crankshaft within the range of the groove, if the intersection of the axis of the crankshaft and the cross section is taken as the center of the circle, and an angle can be formed between the two sides of the groove and the center of the circle, then the angle is less than 120 degrees.
[0007] Optionally, the depth of the groove is less than or equal to 0.5 mm.
[0008] Optionally, the side wall of the groove is provided with a step.
[0009] Optionally, the groove is smoothly connected to the circumferential surface of the shaft.
[0010] Optionally, in the cross-section along the radial direction of the crankshaft within the range of the groove, if a circle with the intersection of the axis of the crankshaft and the cross-section as the center and the distance between the vertices of the side walls on both sides of the groove and the center as the radius is the first circle, and a circle with the intersection of the axis of the crankshaft and the cross-section as the center and the bottom of the groove as the arc is the second circle, then the first circle and the second circle are concentric circles.
[0011] Optionally, a first circle and a second circle can be drawn in the radial cross section of the crankshaft within the groove; the first circle takes the intersection of the axis of the crankshaft and the cross section as the center, and the distance between the endpoints on both sides of the groove and the center as the radius; the second circle takes the bottom of the groove as an arc; the first circle and the second circle intersect.
[0012] Optionally, the crankshaft is provided with a plurality of the eccentric parts.
[0013] The present invention also provides a compressor, comprising any crankshaft as described above.
[0014] The crankshaft and compressor provided by the present invention have the following beneficial effects:
[0015] The present invention provides a crankshaft, comprising a short shaft, a long shaft and an eccentric part, wherein the eccentric part is arranged between the long shaft and the short shaft, a first oil outlet hole is arranged between the eccentric part and the long shaft, and a second oil outlet hole is arranged between the eccentric part and the short shaft; the long shaft is provided with a groove at one end of its circumferential surface close to the first oil outlet hole, and / or the short shaft is provided with the groove at one end of its circumferential surface close to the second oil outlet hole. With such an arrangement, the present invention utilizes a slotted design to improve the lubrication degree of the eccentric part of the crankshaft and effectively reduce the viscous resistance of the oil film.
[0016] The present invention also provides a compressor, comprising any one of the above-mentioned crankshafts. Since the compressor comprises the crankshaft, the compressor utilizes a slotted design to improve the lubrication of the eccentric portion of the crankshaft and effectively reduce the viscous resistance of the oil film.
[0017] Since the compressor provided by the present invention and the crankshaft described above belong to the same inventive concept, the compressor provided by the present invention has all the advantages of the crankshaft described above, so the beneficial effects of the compressor provided by the present invention will not be described one by one here. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 An overall schematic diagram of a crankshaft provided in one embodiment of the present invention.
[0019] Figure 2 A schematic cross-sectional view of the groove along the radial direction of the crankshaft provided in the first embodiment of the present invention.
[0020] Figure 3 A schematic cross-sectional view of the groove along the radial direction of the crankshaft provided for the second embodiment of the present invention.
[0021] The accompanying drawings are denoted as follows:
[0022] 1-long axis; 2-short axis; 3-eccentric part; 10-first oil outlet hole; 11-groove; 20-second oil outlet hole; 21-groove. DETAILED DESCRIPTION
[0023] In order to make the purpose, advantages and features of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In addition, the structure shown in the drawings is often a part of the actual structure. In particular, the emphasis of each drawing is different, and sometimes different scales are used.
[0024] It should be understood that when an element or layer is referred to as "on...", "connected to" other elements or layers, it can be directly on other elements or layers, connected to other elements or layers, or can include intermediate elements or layers. On the contrary, when an element is referred to as "directly on...", "directly connected to" other elements or layers, intermediate elements or layers are not included. Although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish an element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below can be expressed as a second element, component, region, layer or part. Spatial relationship terms such as "under...", "below", "below", "above...", "above", "above", etc., can be used here for the convenience of description to describe the relationship between an element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, the spatial relationship terms are intended to include different orientations of the devices in use and operation. For example, if the device in the accompanying drawings is turned over, then, the elements or features described as "under...", "below", "below" will be oriented to be "on" other elements or features. The device can be oriented in addition (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly. The purpose of the terms used herein is only to describe specific embodiments and is not intended to be a limitation of the present invention. When used herein, the singular forms of "one", "one" and "said / the" are also intended to include plural forms, unless the context clearly indicates another way. It should also be understood that the term "include" is used to determine the inclusion of features, steps, operations, elements and / or parts, but does not exclude the inclusion or addition of one or more other features, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.
[0025] The object of the present invention is to provide a crankshaft and a compressor, which improve the lubrication of the crankshaft journal through a slotted design and reduce the viscous resistance of the oil film.
[0026] Please refer to Figure 1 , Figure 1 FIG. 1 is an overall schematic diagram of a crankshaft provided in one embodiment of the present invention. Figure 1 As shown, in order to achieve the above purpose, the present invention provides a crankshaft, comprising a short shaft 2, a long shaft 1 and an eccentric part 3, wherein the eccentric part 3 is arranged between the long shaft 1 and the short shaft 2, a first oil outlet hole 10 is arranged between the eccentric part 3 and the long shaft 1, and a second oil outlet hole 20 is arranged between the eccentric part 3 and the short shaft 2; the long shaft 1 is provided with a groove 11 at one end of its circumferential surface close to the first oil hole 10, and\or, the short shaft 2 is provided with the groove 21 at one end of its circumferential surface close to the second oil hole 20. With such a configuration, the present invention utilizes a slotted design to improve the lubrication degree of the eccentric part of the crankshaft and effectively reduce the viscous resistance of the oil film.
[0027] Further, the groove 11 passes through one end of the long shaft 1 on its circumferential surface close to the first oil hole 10, and / or, the groove 21 passes through one end of the short shaft 2 on its circumferential surface close to the second oil hole 20. Such an arrangement enables the oil discharged from the oil outlet hole to better cooperate with the groove.
[0028] It should be noted that the present invention limits the parameters of the groove to achieve the optimal working condition as much as possible. In an exemplary embodiment, in the cross section along the radial direction of the crankshaft within the range of the groove, if the intersection of the axis of the crankshaft and the cross section is taken as the center of the circle, and the two sides of the groove and the center of the circle can form an angle, then the angle is less than 120 degrees. Preferably, the depth of the groove is less than or equal to 0.5 mm.
[0029] The shape of the groove can be various shapes, as long as it is inwardly recessed relative to the circumferential surface where it is located. In an exemplary embodiment, the side wall of the groove can be provided with a step. In another exemplary embodiment, the groove is smoothly connected to the circumferential surface of the shaft where it is located.
[0030] Please refer to Figure 2 , Figure 2 The cross-sectional view of the groove along the radial direction of the crankshaft is provided in the first embodiment of the present invention. Figure 2 As shown, in order to further standardize the opening of the groove, in the cross section along the radial direction of the crankshaft within the range of the groove, if the intersection point O of the axis of the crankshaft and the cross section is taken as the center of the circle, and the distance between the vertices A and C of the side walls on both sides of the groove and the center of the circle is taken as the radius of the circle as the first circle, the intersection point O of the axis of the crankshaft and the cross section is taken as the center of the circle, and the bottom of the groove is taken as the arc (end point is Figure 2 The circle of B and D) in the embodiment is the second circle, and the first circle and the second circle are concentric circles. At this time, the cross section of the groove forms a U-shaped shape.
[0031] Preferably, a first circle and a second circle can be drawn in the cross section along the radial direction of the crankshaft within the range of the groove; the first circle takes the intersection of the axis of the crankshaft and the cross section as the center and the distance between the endpoints on both sides of the groove and the center as the radius; the second circle takes the bottom of the groove as an arc; the first circle and the second circle intersect. For details, please refer to Figure 3 , Figure 3 A schematic diagram of a cross section along the radial direction of the crankshaft within the groove range provided for the second embodiment of the present invention, in the cross section along the radial direction of the crankshaft within the groove range, if the intersection point O of the crankshaft axis and the cross section is taken as the center of the circle, the circle with the distance between the end points E and F on both sides of the groove and the center of the circle as the radius is the first circle, and the circle with the bottom of the groove as the arc is the second circle, then the first circle and the second circle intersect. It should be noted that at this time, the center of the second circle is obviously no longer the center O of the first circle. At this time, the cross section of the groove forms a shape similar to a crescent.
[0032] Preferably, the crankshaft is provided with a plurality of the eccentric parts 3 .
[0033] The present invention also provides a compressor, including a crankshaft as described in any one of the above. The compressor is a driven fluid machine that lifts low-pressure gas to high-pressure gas, and is the heart of the refrigeration system. It sucks low-temperature and low-pressure refrigerant gas from the intake pipe, compresses it by driving the piston through the operation of the motor, and then discharges high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle. Since the compressor includes the crankshaft, the compressor uses a slotted design to improve the lubrication of the eccentric part of the crankshaft and effectively reduce the viscous resistance of the oil film.
[0034] Since the compressor provided by the present invention and the crankshaft described above belong to the same inventive concept, the compressor provided by the present invention has all the advantages of the crankshaft described above, so the beneficial effects of the compressor provided by the present invention will not be described one by one here.
[0035] According to the comparative experiments conducted by the inventors, the present invention significantly reduces the compressor input under high speed conditions (new national standard, rated heating, low temperature heating), and improves the cooling power and input under low speed conditions (intermediate cooling, low temperature intermediate cooling). Overall, the APF and new national standard COP of the compressor are both improved by about 0.2%. This will generate huge benefits in large-scale use.
[0036] It should also be noted that, although the present invention has been disclosed as a preferred embodiment, the above embodiment is not intended to limit the present invention. For any technician familiar with the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.
[0037] It should also be understood that, unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are merely used to distinguish between the various components, elements, steps, etc. in the specification, and are not used to indicate the logical relationship or sequential relationship between the various components, elements, steps, etc.
[0038] It should also be recognized that the terms described herein are used only to describe specific embodiments and are not intended to limit the scope of the invention. It should be noted that the singular forms "a" and "an" used herein and in the appended claims include plural references unless the context clearly indicates otherwise. For example, a reference to "a step" or "a device" means a reference to one or more steps or devices, and may include secondary steps and secondary devices. All conjunctions used should be understood in the broadest sense. And, the word "or" should be understood to have the definition of a logical "or", rather than a logical "exclusive or", unless the context clearly indicates otherwise. In addition, the implementation of embodiments of the present invention may include performing selected tasks manually, automatically, or in combination.
Claims
1. A crankshaft, characterized in that: It comprises a short shaft, a long shaft and an eccentric part, wherein the eccentric part is arranged between the long shaft and the short shaft, a first oil outlet hole is arranged between the eccentric part and the long shaft, and a second oil outlet hole is arranged between the eccentric part and the short shaft; The long shaft is provided with a groove at one end of its circumferential surface close to the first oil outlet hole, and / or, the short shaft is provided with the groove at one end of its circumferential surface close to the second oil outlet hole.
2. The crankshaft according to claim 1, characterized in that The groove passes through one end of the major axis on its circumferential surface close to the first oil outlet hole, and / or, the groove passes through one end of the minor axis on its circumferential surface close to the second oil outlet hole.
3. The crankshaft according to claim 1, characterized in that In the cross section along the radial direction of the crankshaft within the range of the groove, if the intersection of the axis of the crankshaft and the cross section is taken as the center of the circle, and an angle can be formed between the two sides of the groove and the center of the circle, then the angle is less than 120 degrees.
4. The crankshaft according to claim 1, characterized in that The depth of the groove is less than or equal to 0.5 mm.
5. The crankshaft according to claim 1, characterized in that The side wall of the groove is provided with a step.
6. The crankshaft according to claim 1, characterized in that The groove is smoothly connected to the circumferential surface of the shaft.
7. The crankshaft according to claim 1, characterized in that In the cross section along the radial direction of the crankshaft within the range of the groove, if the circle with the intersection of the axis of the crankshaft and the cross section as the center and the distance between the vertices of the side walls on both sides of the groove and the center as the radius is the first circle, and the circle with the intersection of the axis of the crankshaft and the cross section as the center and the bottom of the groove as the arc is the second circle, then the first circle and the second circle are concentric circles.
8. The crankshaft according to claim 1, characterized in that A first circle and a second circle can be drawn in a cross section along the radial direction of the crankshaft within the groove; The first circle has the intersection of the axis of the crankshaft and the cross section as the center, and the distance between the endpoints on both sides of the groove and the center as the radius; The second circle has the bottom of the groove as an arc; The first circle and the second circle intersect.
9. The crankshaft according to claim 1, characterized in that The crankshaft is provided with a plurality of the eccentric parts.
10. A compressor, characterized in that: Comprising a crankshaft as claimed in any one of claims 1 to 9.