Crankshaft and compressor

Abstract

The invention provides a crankshaft and a compressor, the crankshaft comprises a long shaft part, an eccentric part and a short shaft part, and an oil absorption channel extends from the long shaft part to the short shaft part; the eccentric part is provided with an oil outlet hole communicated with the oil suction channel, the eccentric part is provided with a first expansion channel passing through the oil outlet hole, the first extension direction of the first expansion channel is parallel to a rotating shaft of the crankshaft, a second expansion channel is arranged in the circumferential direction of the eccentric part, and the second extension direction of the second expansion channel is perpendicular to the first extension direction of the first expansion channel. The oil supply structure of the eccentric part of the crankshaft can be optimized, double insurance of sealing and lubricating is achieved, the volume efficiency is improved, the friction power consumption of the crankshaft is reduced, the overall power consumption is reduced, and the energy efficiency of the compressor is improved.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration equipment, in particular to a crankshaft and a compressor. Background Art

[0002] Under the global theme of energy conservation and environmental protection, the energy efficiency level of air conditioners is constantly improving. As the heart of the air conditioning system, the energy efficiency of the compressor directly affects the performance of the air conditioner. Improving the energy efficiency of the compressor is one of the key points of modern compressor design. The power consumption of the rotary compressor includes motor efficiency, mechanical efficiency, and indicated efficiency. Among them, the current common mechanical efficiency of the rotary compressor is 80%, and there is still a lot of room for improvement. Looking at the composition of mechanical efficiency, the friction power consumption at each bearing accounts for a large proportion, especially the friction power consumption between the eccentric part of the crankshaft and the piston.

[0003] Therefore, the present invention provides a crankshaft and a compressor. Summary of the invention

[0004] In response to the problems in the prior art, the purpose of the present invention is to provide a crankshaft and a compressor that overcome the difficulties of the prior art, can optimize the oil supply structure of the eccentric part of the crankshaft, achieve double insurance of sealing and lubrication, improve volumetric efficiency, reduce the friction power consumption of the crankshaft, and thus reduce the power consumption of the whole machine and improve the energy efficiency of the compressor.

[0005] An embodiment of the present invention provides a crankshaft, comprising: a long axis portion, an eccentric portion and a short axis portion, wherein an oil suction passage extends from the long axis portion to the short axis portion;

[0006] The eccentric part is provided with an oil outlet hole connected to the oil suction channel, the eccentric part is provided with a first expansion channel passing through the oil outlet hole, the first extension direction of the first expansion channel is parallel to the rotation axis of the crankshaft, the eccentric part is provided with a second expansion channel in the circumferential direction, and the second extension direction of the second expansion channel is perpendicular to the first extension direction of the first expansion channel.

[0007] Preferably, the first expansion channel is an arc groove, and the nozzle portion of the oil outlet hole exposed to the surface of the eccentric portion is located at the bottom of the center of the arc groove.

[0008] Preferably, the area of ​​a first cross section of the arc groove perpendicular to the axial direction of the oil outlet hole increases as it moves away from the oil suction channel.

[0009] Preferably, the axis of the oil outlet hole is perpendicular to the rotation axis of the crankshaft.

[0010] Preferably, the second expansion channel is a through cut groove recessed from the outer periphery of the eccentric portion, and the first expansion channel is located at one side of the through cut groove.

[0011] Preferably, the area of ​​the second cross section of the through cutout groove perpendicular to the axial direction of the oil outlet hole increases as it moves away from the oil suction channel.

[0012] Preferably, the two ends of the second expansion channel along the circumference of the eccentric portion are projected at points A and B of a plane perpendicular to the rotation axis, respectively; the center of the eccentric portion is projected at point O of the plane; the intersection of the circumference of the oil outlet hole and the circumscribed circle of the eccentric portion is projected at point D of the plane; the rotation axis of the crankshaft is projected at point C of the plane; the angle between the AC line and the DC line is θ1, the line between DC and BC is θ2, and θ1 and θ2 satisfy the following functional relationship:

[0013] 5°<θ1≤θ2<(130-6.3e)-θ1.

[0014] Preferably, the volume V eliminated by the eccentric portion to form the first expansion channel and the volume V0 eliminated to form the second expansion channel, V and V0 satisfy the following functional relationship:

[0015] 0.0005 <V / V0<(θ1+θ2) / (π*R*200)。

[0016] An embodiment of the present invention further provides a compressor, characterized in that it comprises the above-mentioned crankshaft.

[0017] Preferably, it further comprises a cylinder, the height of the cylinder is H, the length of the first extension channel based on the first extension direction is L, and H and L satisfy the following functional relationship:

[0018] 0.48 <L / H<0.9。

[0019] The crankshaft and compressor of the present invention can optimize the oil supply structure of the eccentric part of the crankshaft, achieve double insurance of sealing and lubrication, improve volumetric efficiency, reduce friction power consumption of the crankshaft, thereby reducing the power consumption of the entire machine and improving the energy efficiency of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0021] Figure 1 Schematic diagram of the crankshaft of the present invention.

[0022] Figure 2 It is a three-dimensional schematic diagram of a part of the crankshaft of the present invention.

[0023] Figure 3 It is a projection schematic diagram of the crankshaft of the present invention based on the XY plane.

[0024] Reference numerals

[0025] 1 Long axis

[0026] 2 Eccentric part

[0027] 3 Short axis

[0028] 4 Nozzle

[0029] 5 Oil suction hole

[0030] 6 Arc slot

[0031] 7 Arc surface

[0032] 8 Cylinders

[0033] 9 Oil outlet DETAILED DESCRIPTION

[0034] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present application. The present application can also be implemented or applied through other different specific implementation methods, and the details in the present application can also be modified or changed in various ways according to different viewpoints and application systems without departing from the spirit of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0035] The following is a detailed description of the embodiments of the present application with reference to the accompanying drawings so that those skilled in the art can easily implement the present application. The present application can be embodied in a variety of different forms and is not limited to the embodiments described herein.

[0036] In the representations of the present application, the representations with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the represented specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples represented in the present application and the features of the different embodiments or examples, unless they contradict each other.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] In order to clearly describe the present application, components irrelevant to the description are omitted, and the same reference symbols are given to the same or similar components throughout the specification.

[0039] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0040] When a device is said to be "on" another device, it may be directly on the other device, but there may also be other devices between it. In contrast, when a device is said to be "directly" on another device, there are no other devices between it.

[0041] Although the terms first, second, etc. are used to represent various elements in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate the existence of features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0042] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present application. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0043] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which this application belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with the relevant technical literature and the contents of the current disclosure, and unless defined, shall not be overly interpreted as ideal or very formal meanings.

[0044] Figure 1 Schematic diagram of the crankshaft of the present invention. Figure 2 It is a three-dimensional schematic diagram of a part of the crankshaft of the present invention. Figure 3 Schematic diagram of the projection of the crankshaft of the present invention based on the XY plane. Figures 1 to 3 As shown, the crankshaft of the present invention comprises: a long axis portion 1, an eccentric portion 2 and a short axis portion 3, and an oil suction channel 5 extends from the long axis portion 1 to the short axis portion 3. The eccentric portion 2 is provided with an oil outlet hole 9 connected to the oil suction channel 5, and the eccentric portion 2 is provided with a first expansion channel 6 passing through the oil outlet hole 9, and the first extension direction of the first expansion channel 6 is parallel to the rotation axis of the crankshaft, and the eccentric portion 2 is provided with a second expansion channel 7 in the circumferential direction, and the second extension direction of the second expansion channel 7 is perpendicular to the first extension direction of the first expansion channel 6. The present invention can effectively reduce friction power consumption and improve the coefficient of performance of the compressor.

[0045] In a preferred embodiment, the first expansion channel 6 is an arc groove, and the oil outlet hole 9 is exposed and the nozzle portion 4 on the surface of the eccentric portion 2 is located at the bottom of the center of the arc groove, but it is not limited thereto.

[0046] In a preferred embodiment, the area of ​​the first cross section of the arc groove perpendicular to the axial direction of the oil outlet hole 9 increases as it moves away from the oil suction channel 5, but the present invention is not limited thereto.

[0047] In a preferred embodiment, the axis of the oil outlet hole 9 is perpendicular to the rotation axis of the crankshaft, but the present invention is not limited thereto.

[0048] In a preferred embodiment, the second expansion channel 7 is a through cut groove recessed from the outer periphery of the eccentric portion 2, and the first expansion channel 6 is located at one side of the through cut groove, but not limited thereto.

[0049] In a preferred embodiment, the area of ​​the second cross section of the through-cut groove perpendicular to the axial direction of the oil outlet hole 9 increases as it moves away from the oil suction channel 5, but the present invention is not limited thereto.

[0050] In a preferred embodiment, the two ends of the second expansion channel 7 along the circumferential direction of the eccentric part 2 are respectively projected onto points A and B on a plane perpendicular to the rotation axis. The center of the eccentric part is projected onto point O on the plane. The intersection of the circumference of the oil outlet hole 9 and the circumscribed circle of the eccentric part 2 is projected onto point D on the plane. The rotation axis of the crankshaft is projected onto point C on the plane; the included angle between the line AC and the line DC is θ1, and the included angle between the line DC and the line BC is θ2. θ1 and θ2 satisfy the following functional relationship:

[0051] 5° < θ1 ≤ θ2 < (130 - 6.3e) - θ1, but not limited thereto.

[0052] In a preferred embodiment, for the eccentric part 2, the volume V eliminated to form the first expansion channel 6 and the volume V0 eliminated to form the second expansion channel 7 satisfy the following functional relationship:

[0053] 0.0005 < V / V0 < (θ1 + θ2) / (π * R * 200), but not limited thereto.

[0054] For the crankshaft of the present invention, the eccentric part 2 is designed with an oil outlet hole 9. On the surface of the crankshaft where the oil outlet hole 9 is located, there is a first expansion channel 6 passing through the oil outlet hole 9 and facing both ends of the eccentric part 2. The actual shape of the first expansion channel 6 on the surface of the crankshaft can be arc-shaped, planar, or a gradually changing surface with a varying radial height in any of the XYZ directions. The projections of the edges of the first expansion channel 6 on the XY plane are points A and B respectively. The projection of the eccentric center of the crankshaft on the XY plane is point O, the projection of the rotation center on the XY plane is point C, and the intersection of the axis of the oil outlet hole 9 and the eccentric outer circle is point D. The included angle between the line AC and the line DC is θ1, and the included angle between the line DC and the line BC is θ2. AB satisfies the relationship: 5° < θ1 ≤ θ2 < (130 - 6.3e) - θ1. Moreover, the relationship between the volume V removed from the channel and the volume V0 of the eccentric part 2 satisfies: 0.0005 < V / V0 < (θ1 + θ2) / (π * R * 200).

[0055] By using the compressor of the present invention, the oil supply structure of the eccentric part of the crankshaft can be optimized, achieving double insurance for sealing and lubrication, improving the volumetric efficiency, reducing the friction power consumption at this part, thereby reducing the overall power of the machine and improving the energy efficiency of the compressor. Experimental verification has been carried out. Compared with the mass-produced crankshafts of the prior art, when using the crankshaft of the present invention, the performance is improved by 0.7% - 1.4% under different working conditions.

[0056]

[0057] The present invention also provides a compressor including the above-mentioned crankshaft. Since the compressor of the present invention adopts the above-mentioned crankshaft, its structural features, technology, and effects are as described above and will not be elaborated here.

[0058] In a preferred embodiment, a cylinder is further included. The height of the cylinder is H, and the length of the first expansion channel 6 in the first extension direction is L. H and L satisfy the following functional relationship:

[0059] 0.48 < L / H < 0.9, but not limited thereto.

[0060] In summary, the object of the present invention is to provide a crankshaft and a compressor, which can optimize the oil supply structure of the eccentric part of the crankshaft, achieve double insurance of sealing and lubrication, improve the volumetric efficiency, reduce the frictional power consumption of the crankshaft, thereby reducing the overall power consumption of the machine and improving the energy efficiency of the compressor.

[0061] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A crankshaft, characterized in that: include: A long axis portion (1), an eccentric portion (2) and a short axis portion (3), wherein an oil suction passage (5) extends from the long axis portion (1) to the short axis portion (3); The eccentric part (2) is provided with an oil outlet hole (9) connected to the oil suction channel (5), and the eccentric part (2) is provided with a first expansion channel (6) passing through the oil outlet hole (9), and a first extension direction of the first expansion channel (6) is parallel to the rotation axis of the crankshaft, and a second expansion channel (7) is provided in the circumferential direction of the eccentric part (2), and a second extension direction of the second expansion channel (7) is perpendicular to the first extension direction of the first expansion channel (6).

2. The crankshaft according to claim 1, characterized in that The first expansion channel (6) is a circular arc groove, and the oil outlet hole (9) is exposed to the nozzle part (4) on the surface of the eccentric part (2) and is located at the bottom of the center of the circular arc groove.

3. The crankshaft according to claim 2, characterized in that The area of ​​a first cross section of the circular arc groove perpendicular to the axial direction of the oil outlet hole (9) increases as it moves away from the oil suction channel (5).

4. The crankshaft according to claim 2, characterized in that The axis of the oil outlet hole (9) is perpendicular to the rotation axis of the crankshaft.

5. The crankshaft according to claim 1, characterized in that The second expansion channel (7) is a through cut groove that is recessed from the outer periphery of the eccentric portion (2), and the first expansion channel (6) is located on one side of the through cut groove.

6. The crankshaft according to claim 5, characterized in that The area of ​​the second cross section of the through cut groove perpendicular to the axial direction of the oil outlet hole (9) increases as it moves away from the oil suction channel (5).

7. The crankshaft according to claim 1, characterized in that The two ends of the second expansion channel (7) along the circumference of the eccentric part (2) are projected at points A and B on a plane perpendicular to the rotation axis, respectively; the center of the eccentric part is projected at point O on the plane; the intersection of the circumference of the oil outlet hole (9) and the circumscribed circle of the eccentric part (2) is projected at point D on the plane; the rotation axis of the crankshaft is projected at point C on the plane; the angle between the AC line and the DC line is θ1, the line between DC and BC is θ2, and θ1 and θ2 satisfy the following functional relationship: 5°<θ1≤θ2<(130-6.3e)-θ1.

8. The crankshaft according to claim 1, characterized in that The volume V eliminated by the eccentric portion (2) to form the first expansion channel (6) and the volume V0 eliminated to form the second expansion channel (7), V and V0 satisfy the following functional relationship: 0.0005 <V / V0<(θ1+θ2) / (π*R*200)。 9. A compressor, characterized in that: Comprising the crankshaft as claimed in claim 1.

10. The compressor according to claim 9, characterized in that It also includes a cylinder, the height of the cylinder is H, the length of the first extension channel (6) based on the first extension direction is L, and H and L satisfy the following functional relationship: 0.48 <L / H<0.9。

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