Compressor crankshaft and compressor comprising same

Abstract

The invention provides a compressor crankshaft and a compressor comprising the same. The crankshaft comprises a long shaft part, at least one eccentric part and a short shaft part which are sequentially arranged in the axial direction. And at least one oil guide groove is formed in the upper thrust part of the eccentric part on one side of the long shaft part. According to the crankshaft disclosed by the invention, at least one oil guide groove is formed in the upper thrust part of the eccentric part on one side of the long shaft part, so that lubricating oil can quickly reach a space between a spiral groove in the inner diameter of a cylinder cover and an upper cylinder cover friction pair through the oil guide groove to form a stable oil film, and lubrication at the position is realized; according to the compressor crankshaft, the oil pumping speed of a compressor at a low rotating speed is effectively increased, so that a related friction pair is lubricated more timely, oil pumping at a high rotating speed is not affected, and the operation stability and the service life of the compressor are improved.

Description

Technical Field

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

[0002] During the operation of the air-conditioning compressor, there will be intermittent operation. At this time, the lubrication effect of the friction pairs of various components of the compressor depends not only on the amount of oil pumped by the compressor, but also on the speed of the compressor pumping oil.

[0003] During the compressor development process, wear problems often occur during life test, and generally occur under low-speed intermittent conditions. Therefore, it is urgent to develop a compressor crankshaft to improve this problem and enhance the reliability of the compressor.

[0004] 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 invention, and therefore may include information that does not constitute the prior art known to those skilled in the art. Summary of the invention

[0005] In view of the problems in the prior art, the purpose of the present invention is to provide a compressor crankshaft and a compressor including the same. The compressor crankshaft of the present invention effectively improves the oil pumping speed of the compressor at low speed, so that the relevant friction pairs can be lubricated more promptly, while not affecting the oil pumping at high speed, thereby improving the stability and life of the compressor operation.

[0006] A first aspect of the present invention provides a compressor crankshaft, the crankshaft comprising a long shaft portion, at least one eccentric portion and a short shaft portion arranged in sequence along the axial direction;

[0007] At least one oil guide groove is arranged on the upper thrust portion of the eccentric portion at one side of the long axis portion.

[0008] According to the first aspect of the present invention, a back-off groove is provided at the connection between the long axis portion and the upper thrust portion;

[0009] The at least one oil guide groove extends from the outer edge of the upper thrust portion toward the tool retreat groove.

[0010] According to the first aspect of the present invention, the at least one oil guide groove is a wedge-shaped structure, and the small end surface of the wedge-shaped structure is arranged at the inner edge of the upper end surface of the upper thrust portion.

[0011] According to the first aspect of the present invention, the width of the at least one oil guide groove is w, which satisfies: 1 mm ≤ w ≤ 2 mm.

[0012] According to the first aspect of the present invention, the depth of the at least one oil guide groove is d, and the height of the upper thrust portion is h, satisfying: h / 2≤d≤h.

[0013] A second aspect of the present invention provides a compressor, comprising the compressor crankshaft.

[0014] According to a second aspect of the present invention, the compressor is characterized in that it further comprises an upper cylinder cover arranged on one side of the long axis portion, and the upper end surface of the upper cylinder cover is provided with a spiral groove;

[0015] The extending direction of the at least one oil guiding groove is consistent with the direction of the spiral groove.

[0016] According to a second aspect of the present invention, an extending direction of the at least one oil guiding groove is consistent with a rotation direction of the compressor.

[0017] According to the second aspect of the present invention, the angle between the at least one oil guiding groove and the axis of symmetry of the eccentric portion is α, and satisfies: 0<α<45°.

[0018] According to the second aspect of the present invention, the angle between the at least one oil guiding groove and the axis of symmetry of the eccentric portion is α, and satisfies: 10°<α<30°.

[0019] The crankshaft of the present invention is provided with at least one oil guide groove on the upper end surface of the upper thrust portion of the eccentric portion on one side of the long axis portion. The oil guide groove can enable the lubricating oil to reach the friction pair between the upper spiral groove and the upper cylinder head more quickly and form a stable oil film, thereby achieving lubrication there. The compressor crankshaft of the present invention effectively improves the oil pumping speed of the compressor at low speed, so that the relevant friction pairs can be lubricated more promptly, while not affecting the oil pumping at high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present invention will become more apparent. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same figure numbers in the figures represent the same or similar parts, and their repeated descriptions will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0021] Figure 1 A schematic structural diagram of a compressor crankshaft according to an embodiment of the present invention;

[0022] Figure 2 A top view of a compressor crankshaft according to an embodiment of the present invention;

[0023] Figure 3 for Figure 1 A schematic diagram of the enlarged structure in the dotted box;

[0024] Figure 4 A schematic structural diagram of a compressor according to an embodiment of the present invention;

[0025] Figure 5 A schematic structural diagram of a compressor crankshaft and a piston according to an embodiment of the present invention;

[0026] Figure 6 A comparison curve diagram of the oil output of the upper spiral groove of the existing compressor crankshaft and the compressor crankshaft of one embodiment of the present invention when the crankshaft speed is 1200 rpm;

[0027] Figure 7 The graph is a comparison curve of the oil output of the upper spiral groove of the existing compressor crankshaft and the compressor crankshaft of one embodiment of the present invention when the crankshaft speed is 7200 rpm. DETAILED DESCRIPTION

[0028] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0029] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like 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 this specification. Moreover, the specific features, structures, materials or characteristics represented 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 different embodiments or examples and features of different embodiments or examples represented in this specification without contradiction.

[0030] Throughout the specification, when it is said that a device is "connected" to another device, this includes not only the situation of "direct connection" but also the situation of "indirect connection" by placing other elements therebetween. Terms indicating relative spaces such as "below" and "above" may be used to more easily explain the relationship of one device illustrated in the accompanying drawings relative to another device. Such terms refer not only to the meanings indicated in the accompanying drawings, but also to other meanings or operations of the device in use. For example, if the device in the accompanying drawings is turned over, a device that was described as being "below" other devices is described as being "above" other devices. Therefore, the exemplary term "below" includes both above and below. The device can be rotated 90° or other angles, and the terms representing relative spaces are interpreted accordingly.

[0031] 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 that there are the described 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.

[0032] 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 specification 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.

[0033] In view of the existing technical problems, the present invention provides a compressor crankshaft and a compressor including the same, wherein the crankshaft includes a long axis portion, at least one eccentric portion and a short axis portion arranged in sequence along the axial direction; at least one oil guide groove is provided on the upper end surface of the upper thrust portion of the eccentric portion on one side of the long axis portion. The crankshaft of the present invention is provided with at least one oil guide groove on the upper end surface of the upper thrust portion of the eccentric portion on one side of the long axis portion, through which the lubricating oil can reach the friction pair between the upper spiral groove and the upper cylinder head more quickly and form a stable oil film, thereby achieving lubrication there. The compressor crankshaft of the present invention effectively improves the oil pumping speed of the compressor at low speed, so that the relevant friction pair can be lubricated more timely, while not affecting the oil pumping at high speed, thereby improving the stability and life of the compressor operation.

[0034] The structure of the compressor crankshaft and the compressor including the same of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It can be understood that the various specific embodiments are not intended to limit the protection scope of the present invention.

[0035] Figure 1 The schematic diagram of the structure of the compressor crankshaft of one embodiment of the present invention is a schematic diagram of the structure of the compressor crankshaft, which transmits the rotational force of the compressor motor to the cylinder to compress the refrigerant. Specifically, the compressor crankshaft includes a long axis portion 1, two eccentric portions and a short axis portion 3 arranged in sequence along the axial direction; the two eccentric portions are an upper eccentric portion 21 and a lower eccentric portion 22, that is, the crankshaft in this embodiment is a crankshaft of a twin-cylinder compressor. Usually, the long axis portion is coaxial with the short axis portion, and the eccentric portion is not coaxial with the long axis portion and the short axis portion.

[0036] At least one oil guide groove 2112 is provided at the eccentric portion on one side of the long axis portion 1 , that is, at the upper thrust portion 211 of the upper eccentric portion 21 in this embodiment. Figure 2 2 is a top view of a compressor crankshaft according to an embodiment of the present invention. In this embodiment, there is one oil guide groove 2112. In other embodiments, the number of oil guide grooves may be greater than 1, and the number may also be increased according to demand or determined according to the model of the compressor used.

[0037] Figure 1 In the embodiment, the crankshaft is a crankshaft of a two-cylinder compressor. The compressor crankshaft of the present invention is not limited to a two-cylinder compressor, but can also be a single-cylinder compressor. In this case, the crankshaft includes an eccentric portion, and the eccentric portion on one side of the long axis portion is the eccentric portion.

[0038] Furthermore, a back cutter groove 23 is provided at the connection between the long axis portion 1 and the upper stop portion 211, that is, at the end of the long axis portion 1. The back cutter groove 23 generally has a chamfered structure. The oil guide groove 2112 extends from the outer edge of the upper stop portion 211 to the back cutter groove 23. Figure 2 As shown, the oil guide groove 2112 spans across the upper end surface of the upper thrust portion 211 .

[0039] The at least one oil guide groove 2112 is a wedge-shaped structure, and the small end face of the wedge-shaped structure is arranged at the inner edge of the upper end face of the upper thrust portion 211. In some embodiments, the wedge-shaped structure is manifested as a change in the depth of the oil guide groove in its extension direction, and the size in its extension direction is consistent, that is, the width of the groove on the upper end face of the upper thrust portion 211 is consistent. Preferably, the width of the at least one oil guide groove is w, which satisfies: 1mm≤w≤2mm. The depth of the at least one oil guide groove is d, where the depth is the size of the large end face of the wedge-shaped structure in a direction perpendicular to the upper end face of the upper thrust portion 211, see Figure 3 The height of the upper thrust portion is h, which satisfies: h / 2≤d≤h.

[0040] By providing one or more oil guide grooves 2112 on the upper end surface of the upper thrust portion 211, the compressor crankshaft of the present invention can increase the oil pumping speed of the compressor, shorten the time for the refrigerant oil to reach the spiral groove, and thus improve the reliability of the compressor under intermittent operating conditions.

[0041] The present invention also provides a compressor, comprising the compressor crankshaft. Figure 4 2 is a compressor of an embodiment. In this embodiment, the compressor is a two-cylinder compressor, that is, the compressor further includes an upper cylinder head 51, a lower cylinder head 53 and an intermediate plate 52 between the two cylinders. In actual use, in order to increase the lubrication of the friction pair of the upper cylinder head, the extension direction of the oil guide groove 2112 is consistent with the rotation direction of the compressor. Here, the extension direction of the oil guide groove 2112 is defined as the direction in which the oil guide groove 2112 extends from the outer edge to the inner edge of the upper thrust portion 211 where it is located. That is, when the rotation direction of the compressor is as Figure 2 When the oil guide groove 2112 rotates counterclockwise as shown by the dotted arrow, the extension direction of the oil guide groove 2112 is as shown by the dotted arrow. And the angle between the oil guide groove 2112 and the symmetry axis X of the eccentric part is α, see Figure 2 , and satisfies: 0<α<45°. More preferably, the angle α satisfies: 10°<α<30°.

[0042] Figure 5 Schematic diagram of the structure of a crankshaft and a piston of a compressor according to an embodiment of the present invention. Specifically, the compressor further includes two pistons, namely an upper piston 41 and a lower piston 42. The upper piston 41 and the lower piston 42 are respectively sleeved on the upper eccentric portion 21 and the lower eccentric portion 22. The upper end surface of the upper thrust portion 211 of the upper eccentric portion 21 and the upper end surface of the upper piston 41 form a groove 411. Specifically, the upper piston 41, the upper eccentric portion 21 and the upper thrust portion 211 are combined to form a crescent-shaped groove 411, and the oil guide groove 2112 is communicated with the groove 411.

[0043] The crescent-shaped groove 411 formed by the upper piston 41, the upper eccentric part 21 of the crankshaft and the upper thrust part 211 will gather a lot of oil during the oil pumping process. In the existing compressor, this part of oil is excessive for the local lubrication of the upper piston, which is an excess amount of pumped oil. In the present invention, the oil guide groove 2112 can make this part of oil flow more fully to the spiral groove (not shown in the figure) on the inner diameter of the upper cylinder head where the amount of pumped oil is less and more prone to wear problems. That is, when the compressor is running at a low speed, due to the low oil pumping height, the oil supply flow path of the spiral groove is mainly the upper eccentric part, and then enters the chamber here through the crescent-shaped groove 411. Under the guiding effect of the oil guide groove 2112, a stable oil film can be formed between the spiral groove and the friction pair of the upper cylinder head more quickly, thereby achieving lubrication here.

[0044] In order to characterize the effect of the compressor crankshaft of the present invention on oil conduction between the spiral groove and the friction pair of the upper cylinder cover, the oil outlet flow curves of the existing compressor crankshaft oil pumping scheme and the compressor crankshaft oil pumping scheme of one embodiment of the present invention are simulated. Figure 6 The figure is a comparison curve of the oil output of the spiral groove of the existing compressor crankshaft and the compressor crankshaft of one embodiment of the present invention when the crankshaft speed is 1200rpm. It can be seen that when the compressor is running at a low speed of 1200rpm, the oil output speed of the spiral groove of the compressor of one embodiment of the present invention is significantly faster than the oil output speed of the spiral groove of the existing compressor crankshaft, and the oil output time is shortened by about 29.8%. At the same time, the effective oil output is also increased by 7.14%.

[0045] Figure 7 The comparison curve of the oil output of the spiral groove of the existing compressor crankshaft and the compressor crankshaft of one embodiment of the present invention when the crankshaft speed is 7200rpm shows that when the compressor is running at a high speed of 7200rpm, the oil output speed of the spiral groove of the compressor of one embodiment of the present invention is not much different from that of the spiral groove of the existing compressor crankshaft. The simulation results show that the compressor crankshaft of the present invention effectively improves the oil pumping speed of the compressor at low speed, so that the related friction pairs are lubricated more timely, and at the same time does not affect the oil pumping at high speed, thereby improving the stability and life of the compressor operation.

[0046] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is limited by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present application. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A compressor crankshaft, characterized in that: The crankshaft comprises a long axis portion, at least one eccentric portion and a short axis portion which are sequentially arranged along the axial direction; At least one oil guide groove is arranged on the upper thrust portion of the eccentric portion at one side of the long axis portion.

2. The compressor crankshaft according to claim 1, characterized in that A cutter recess is provided at the connection between the long axis portion and the upper thrust portion; The at least one oil guide groove extends from the outer edge of the upper thrust portion toward the tool retreat groove.

3. The compressor crankshaft according to claim 1, characterized in that The at least one oil guide groove is in a wedge-shaped structure, and the small end surface of the wedge-shaped structure is arranged at the inner edge of the upper end surface of the upper thrust portion.

4. The compressor crankshaft according to claim 1, characterized in that The width of the at least one oil guide groove is w, which satisfies: 1mm≤w≤2mm.

5. The compressor crankshaft according to claim 1, characterized in that The depth of the at least one oil guide groove is d, and the height of the upper thrust portion is h, satisfying: h / 2≤d≤h.

6. A compressor, characterized in that: A compressor crankshaft comprising the compressor crankshaft according to any one of claims 1 to 5.

7. The compressor according to claim 6, characterized in that The compressor also includes at least one piston, which is sleeved on the at least one eccentric part, and the upper end surface of the upper thrust portion of the eccentric part on the side of the long axis part and the upper end surface of the piston on the side of the long axis part form a groove, and the at least one oil guide groove is connected to the groove.

8. The compressor according to claim 6, characterized in that The extending direction of the at least one oil guiding groove is consistent with the rotation direction of the compressor.

9. The compressor according to claim 8, characterized in that The included angle between the at least one oil guide groove and the symmetry axis of the eccentric portion is α, and satisfies: 0<α<45°.

10. The compressor according to claim 8, characterized in that The included angle between the at least one oil guiding groove and the symmetry axis of the eccentric portion is α, and satisfies: 10°<α<30°.

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