Crankshaft and compressor having the same

Abstract

The present invention discloses a crankshaft, which is divided into an upper crankshaft including a first rotating shaft and a lower crankshaft including a second rotating shaft and an eccentric part; one end of the upper crankshaft connected to an external motor protrudes in all directions along the axis direction to form a thrust portion. The crankshaft protrudes outward to form a thrust portion, which increases the thrust area, reduces the contact pressure, and improves the wear resistance of the wear surface. The present invention also provides a compressor having the crankshaft.

Description

Technical Field

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

[0002] A rolling rotor type rotary compressor usually uses the lower end surface of the auxiliary shaft portion of the crankshaft as the crankshaft thrust portion, which cooperates with the thrust surface of the thrust plate to form a sliding thrust friction pair, thereby limiting the axial movement of the crankshaft in a timely manner.

[0003] It was found during actual use that the wear of the thrust friction pair was very serious, which seriously affected the performance of the compressor and caused thrust noise, electromagnetic noise and other problems.

[0004] Therefore, the industry is in urgent need of a technical solution that can solve the above problems. Summary of the invention

[0005] The invention provides a crankshaft to solve the problem that the thrust part formed on the current crankshaft cooperates with the thrust surface of the thrust plate to form a sliding thrust friction pair with serious wear, thus affecting the performance of the compressor.

[0006] Correspondingly, the present invention also provides a compressor using the crankshaft.

[0007] In a first aspect, the present invention provides a crankshaft.

[0008] The crankshaft is divided into an upper crankshaft including a first rotating shaft and a lower crankshaft including a second rotating shaft and an eccentric part; the upper crankshaft and the lower crankshaft are connected, and one end of the upper crankshaft connected to the external motor protrudes around along the axial direction to form a thrust portion.

[0009] An external thread is provided on the outer surface of one end of the upper crankshaft, and an internal thread is provided on the inner surface of one end of the eccentric portion of the lower crankshaft, and the external thread is adapted to the internal thread; the first rotating shaft is arranged inside the upper crankshaft, and when the threads of the upper crankshaft and the lower crankshaft are connected, the eccentric portion is connected to the first rotating shaft.

[0010] Specifically, the outer surface of the thrust portion is an arc surface.

[0011] Furthermore, a boss is provided at one end of the lower crankshaft close to the upper crankshaft and is protruded in all directions along the axial direction of the crankshaft, and the boss is in the form of an arc surface.

[0012] In a second aspect, the present invention provides a compressor.

[0013] The compressor comprises a crankshaft and a flange, wherein the crankshaft is passed through the flange, and is characterized in that the crankshaft is the crankshaft described in any one of the first aspects.

[0014] Furthermore, the flange comprises:

[0015] A lower flange, wherein the second rotating shaft of the crankshaft is passed through the lower flange;

[0016] The upper flange, the first rotating shaft of the crankshaft is passed through the upper flange, the thrust portion is matched with the upper flange, and a thrust curved surface is correspondingly provided on the upper flange corresponding to the thrust portion.

[0017] Specifically, an end of the upper flange connected to the thrust portion extends from the inside to the outside to form a bell mouth, and an oil storage gap is further formed between the bell mouth and the thrust portion.

[0018] Preferably, the upper flange has a journal, and the connection between the upper crankshaft and the lower crankshaft is located in the journal, and the connection is located in the interval from one-half of the length of the journal to the eccentric portion.

[0019] Specifically, the lower crankshaft is provided with a boss protruding in all directions along the axial direction of the crankshaft near one end of the upper crankshaft, and the boss is an arc surface; the upper flange is recessed inwardly corresponding to the boss to form an arc surface structure adapted to the boss.

[0020] Compared with the prior art, the solution of the present invention has the following advantages:

[0021] In the present invention, one end of the crankshaft connected to the external motor is convex in the axial direction to form a thrust portion. This design can increase the thrust area, reduce the contact pressure, and improve the wear resistance of the wear surface. At the same time, the thrust portion is designed as an arc surface to assist the automatic centering of the crankshaft. Furthermore, the crankshaft can effectively improve the crankshaft stiffness and the shaft system deflection under the reinforcement of the thrust portion, which is conducive to improving the noise of the compressor.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, which will become obvious from the following description, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic structural diagram showing an embodiment of a crankshaft in the present invention;

[0025] Figure 2 A schematic structural diagram of an embodiment of a compressor in the present invention is shown;

[0026] Figure 3 A partial structural schematic diagram of an embodiment of an oil storage gap in a compressor in the present invention is shown.

[0027] The above drawings include the following reference numerals:

[0028] 1. Crankshaft; 11. First rotating shaft; 12. Second rotating shaft; 20. Eccentric portion; 30. Thrust portion; 10a. Upper crankshaft; 10b. Lower crankshaft; 101a. External thread; 101b. Internal thread; 102b. Boss; 2. Flange; 3. Upper flange; 31. Thrust surface; 32. Arc surface structure; 4. Lower flange; 5 Cylinder; 6. Bell mouth; 7. Oil storage gap. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0030] It will be understood by those skilled in the art that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0031] See also Figure 1 and Figure 2 , the present invention provides a crankshaft.

[0032] The crankshaft 1 includes an upper crankshaft 10a and a lower crankshaft 10b. The upper crankshaft 10a includes a first rotating shaft 11; the lower crankshaft 10b includes a second rotating shaft 12 and an eccentric portion 20. The axes of the first rotating shaft 11 and the second rotating shaft 12 coincide, and the upper crankshaft 10a and the lower crankshaft 10b are connected. The eccentric portion 20 may be an eccentric wheel. In an embodiment of the present invention, the crankshaft 1 is used for a compressor. In a compressor, the crankshaft 1 is connected to an external motor. A thrust portion 30 is formed on one end of the crankshaft 1 connected to the motor. The thrust portion 30 is formed by protruding from one end of the upper crankshaft 10a of the crankshaft 1 along the axial direction. The design of the crankshaft 1 protruding from all sides to form the thrust portion 30 can increase the thrust area, reduce the contact pressure, improve the wear resistance of the wear surface, and help improve the performance of the compressor.

[0033] Specifically, the outer surface of the thrust portion 30 is an arc surface. The center of the arc surface of the thrust portion 30 is located on the axis of the crankshaft 1, which can effectively assist the automatic centering of the crankshaft.

[0034] At the same time, since the thrust portion 30 is formed by protruding in all directions along the axial direction, its radial length becomes longer, which helps to improve the radial rigidity of the crankshaft thrust portion 30, and can effectively improve the crankshaft rigidity and the shaft system deflection.

[0035] In this embodiment, the upper crankshaft 10a is threadedly connected to the lower crankshaft 10b. The first rotating shaft 11 is arranged inside the upper crankshaft 10a. One end of the first rotating shaft 11 is located on the end surface of the upper crankshaft 10a close to one end of the lower crankshaft 10b. When the upper crankshaft 10a is connected to the lower crankshaft 10b, the eccentric portion 20 is connected to the first rotating shaft 11. Among them, the outer surface of one end of the upper crankshaft 10a is provided with an external thread 101a, and the inner surface of one end of the lower crankshaft 10b is provided with an internal thread 101b, and the external thread 101a is adapted to the internal thread 101b. The end of the upper crankshaft 10a with an external thread is screwed into the end of the lower crankshaft 10b with an internal thread to achieve threaded connection.

[0036] Please continue to refer to Figure 1 In order to further ensure the thrust stop effect of the crankshaft, in a specific embodiment of the present invention, the lower crankshaft 10b is also provided with a boss 102b that realizes a partial thrust stop effect. The boss 102b is located at one end of the lower crankshaft 10b close to the first rotating shaft 11. The boss 102b is formed by protruding in all directions along the axis of the crankshaft, and the surface of the boss 102b is an arc surface. This design can also increase the thrust stop area and reduce the contact pressure.

[0037] Please continue to refer to Figure 2 As described above, in the present invention, the crankshaft is used for a compressor.

[0038] In this embodiment, the compressor includes a crankshaft 1 and a flange 2. The crankshaft 1 is inserted into the flange 2. The flange 2 includes an upper flange 3 and a lower flange 4. The second rotating shaft 12 of the crankshaft 1 is inserted into the lower flange 4. The first rotating shaft 11 of the crankshaft 1 is inserted into the upper flange 3. The eccentric portion 20 of the crankshaft 1 is located between the upper flange 3 and the lower flange 4.

[0039] The end of the crankshaft 1 close to the motor is provided with a thrust portion 30, and correspondingly, the end of the upper flange 3 close to the motor is provided with a thrust curved surface 31, and the thrust portion 30 is matched with the thrust curved surface 31. When the first rotating shaft 11 and the second rotating shaft 12 of the crankshaft rotate relative to the flange 2, the thrust portion 30 is matched with the thrust curved surface 31, which effectively increases the thrust area, reduces the wear of the compressor, ensures the performance of the compressor and reduces the noise.

[0040] The compressor further includes a cylinder 5 , which is located between the upper flange 3 and the lower flange 4 , and is installed below the upper flange 3 .

[0041] In a preferred embodiment of the present invention, one end of the upper flange 3 connected to the thrust portion 30 forms a bell mouth 6, and the bell mouth is formed by extending from the inside to the outside of the upper flange 3. At the same time, there is a certain accommodation space between the bell mouth 6 and the thrust portion 30, and the accommodation space is the oil storage gap 7, which helps to reduce the wear and friction of the thrust portion, and further reduces the noise while ensuring the performance of the compressor.

[0042] The upper flange 3 has a journal 8, and the connection between the upper crankshaft 10a and the lower crankshaft 10b is located in the journal 8. At the same time, the connection is located in the interval between half of the length of the journal 8 and the eccentric portion 20. The connection is controlled in the half part of the inner side of the journal 8, which helps to improve the stability of the structure.

[0043] Specifically, since the lower crankshaft 10b has a boss 102b with an arc surface, the upper flange 3 is recessed inwardly corresponding to the boss 102b to form an arc surface structure 32 adapted to the boss 102b. The center positions of the boss 102b of the lower crankshaft 10b and the arc surface structure of the upper flange 3 are both located on the axis of the crankshaft 1, and the boss 102b of the lower crankshaft 10b and the arc surface structure 32 of the upper flange are adapted to effectively control the axial movement of the crankshaft.

[0044] In the compressor of the present invention, one end of the upper crankshaft connected to the external motor is convex in the axial direction to form a thrust portion. This design can increase the thrust area, reduce the contact pressure, and improve the wear resistance of the wear surface. At the same time, the thrust portion is designed as an arc surface to assist the automatic centering of the crankshaft. Furthermore, the crankshaft can effectively improve the crankshaft stiffness and the shaft system deflection under the reinforcement of the thrust portion, which is conducive to improving the noise of the compressor.

[0045] The embodiments of the technical solutions provided by the present invention are described in detail above. For those skilled in the art, according to the ideas of the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A crankshaft, characterized in that: The crankshaft is divided into an upper crankshaft including a first rotating shaft and a lower crankshaft including a second rotating shaft and an eccentric part; the upper crankshaft and the lower crankshaft are connected, and one end of the upper crankshaft connected to the external motor protrudes in all directions along the axial direction to form a thrust portion; the lower crankshaft is provided with a boss protruding in all directions along the axial direction of the crankshaft at one end close to the upper crankshaft, and the boss is an arc surface.

2. The crankshaft according to claim 1, characterized in that An external thread is provided on the outer surface of one end of the upper crankshaft, and an internal thread is provided on the inner surface of one end of the eccentric portion of the lower crankshaft, and the external thread is adapted to the internal thread; the first rotating shaft is arranged inside the upper crankshaft, and when the threads of the upper crankshaft and the lower crankshaft are connected, the eccentric portion is connected to the first rotating shaft.

3. The crankshaft according to claim 1, characterized in that The outer surface of the thrust portion is an arc surface.

4. A compressor, characterized in that: It comprises a crankshaft and a flange, wherein the crankshaft is passed through the flange, and the crankshaft is the crankshaft according to any one of claims 1 to 3.

5. The compressor according to claim 4, characterized in that The flange comprises: A lower flange, wherein the second rotating shaft of the crankshaft is passed through the lower flange; The upper flange, the first rotating shaft of the crankshaft is passed through the upper flange, the thrust portion is matched with the upper flange, and a thrust curved surface is correspondingly provided on the upper flange corresponding to the thrust portion.

6. The compressor according to claim 5, characterized in that The end of the upper flange connected to the thrust portion extends from the inside to the outside to form a bell mouth, and an oil storage gap is further formed between the bell mouth and the thrust portion.

7. The compressor according to claim 5, characterized in that The upper flange is provided with a journal, and a connection point between the upper crankshaft and the lower crankshaft is located in the journal, and the connection point is located in a range from one-half of the length of the journal to the eccentric portion.

8. The compressor according to claim 7, characterized in that The lower crankshaft is provided with a boss protruding in all directions along the axial direction of the crankshaft at one end close to the upper crankshaft, and the boss is an arc surface; the upper flange is recessed inwardly corresponding to the boss to form an arc surface structure adapted to the boss.

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