Crankshaft and compressor

Abstract

This invention provides a crankshaft and a compressor. The crankshaft includes an eccentric portion and a central through hole inside it. The eccentric portion has a thrust portion, and at least one end face of the eccentric portion has a protrusion for cooperating with the piston of the compressor to seal the exhaust port on the cylinder head of the compressor. The eccentric portion, the thrust portion, and the protrusion together form a first oil guide groove. The eccentric portion also has at least one oil outlet channel, a second oil guide groove, and a third oil guide groove. The first end of the oil outlet channel is connected to the central through hole, and the second end of the oil outlet channel extends to the outer wall of the eccentric portion. The two ends of the second oil guide groove extend toward the axial end faces of the eccentric portion, respectively. The third oil guide groove is located on the outer wall of the eccentric portion and connects the first and second oil guide grooves. This invention can effectively increase the amount of lubricating oil at the protrusion while ensuring the rigidity of the crankshaft, reduce wear, facilitate radial clearance sealing and end face sealing of the pump body, and improve the performance of the compressor.

Description

Technical Field

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

[0002] Existing pump bodies with small shaft diameters and large eccentricities can expand the space for the exhaust port by adding a sealing protrusion to the eccentric part of the crankshaft. However, due to the local rigidity limitation at the short shaft of the crankshaft, the oil in the existing eccentric part oil groove cannot be directly connected to the oil storage chamber at the crankshaft seal inside the piston (i.e., the groove between the thrust surface and the sealing protrusion). This results in insufficient lubrication at the protrusion, leading to increased wear on the protrusion, which in turn affects the radial seal of the pump body and the piston end face seal, causing increased leakage inside the compressor pump body and thus affecting the compressor performance. Utility Model Content

[0003] To address the problems in the existing technology, the purpose of this utility model is to provide a crankshaft and compressor that effectively increases the amount of lubricating oil at the protruding part inside the piston, reduces wear, facilitates radial clearance sealing and end face sealing of the pump body, and improves the performance of the compressor.

[0004] An embodiment of this utility model provides a crankshaft, including an eccentric portion and a central through hole therein. The eccentric portion has a thrust portion and a protrusion on at least one end face of the eccentric portion. The protrusion is used to cooperate with the piston of a compressor to seal the exhaust port on the cylinder head of the compressor. The eccentric portion, the thrust portion, and the protrusion together form a first oil guide groove. The eccentric portion is also provided with at least one oil outlet channel, a second oil guide groove, and a third oil guide groove. The first end of the oil outlet channel is connected to the central through hole, and the second end of the oil outlet channel extends to the outer wall of the eccentric portion. The two ends of the second oil guide groove extend toward the axial ends of the eccentric portion, respectively. The third oil guide groove is located on the outer wall of the eccentric portion and connects the first oil guide groove and the second oil guide groove.

[0005] In some embodiments, the third oil guide groove is a straight groove, an inclined groove, a spiral groove, or an arc-shaped groove.

[0006] In some embodiments, the width of the third oil guide groove is uniform.

[0007] In some embodiments, the width of the third oil guide groove is not uniform.

[0008] In some embodiments, the first end and the second end of the third oil guide groove are at the same height on the side wall of the eccentric portion.

[0009] In some embodiments, the first end and the second end of the third oil guide groove are at different heights on the side wall of the eccentric portion.

[0010] In some embodiments, the plane formed by the rotation center of the crankshaft and the rotation center of the eccentric portion is used as a reference plane. On a plane perpendicular to the reference plane, the angle formed by the line connecting the projection of the starting point of the third oil guide groove to the center of the crankshaft and the line connecting the projection of the ending point of the third oil guide groove to the center of the crankshaft is θ. 0° is defined as passing through the reference plane and pointing from the center of the eccentric portion to the center of the crankshaft. According to the rotation direction of the crankshaft, within the range of 0° to 180°, the projection of the thrust portion on the plane and the projection of the eccentric portion on the plane are compared at point A. The angle between the line connecting point A to the center of the crankshaft and the reference plane is θ1. The projection of the end of the protrusion on the plane and the projection of the eccentric portion on the plane are compared at point B. The angle between the line connecting point B to the center of the crankshaft and the reference plane is θ2. θ satisfies θ1 < θ < θ2.

[0011] This utility model embodiment also provides a compressor, including the crankshaft as described above.

[0012] In some embodiments, the system further includes an upper cylinder head, a lower cylinder head, a cylinder, and a piston. The upper cylinder head and the lower cylinder head are disposed at both axial ends of the cylinder, and the piston is sleeved on the eccentric portion and disposed inside the cylinder.

[0013] In some embodiments, the upper cylinder head is provided with a first exhaust port, the side face of the eccentric portion near the upper cylinder head is a first end face, and the protrusion is provided on one side of the first end face; and / or, the lower cylinder head is provided with a second exhaust port, the side face of the eccentric portion near the lower cylinder head is a second end face, and the protrusion is provided on the second end face.

[0014] The crankshaft and compressor provided by this utility model have the following advantages:

[0015] By setting a third oil guide groove to connect the first and second oil guide grooves, the rigidity of the crankshaft can be guaranteed, and the lubricating oil can flow quickly from the second oil guide groove to the first oil guide groove through the third oil guide groove, effectively increasing the amount of lubricating oil at the protrusion, reducing wear, which is beneficial to the radial clearance sealing and end face sealing of the pump body, and improving the performance of the compressor. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a schematic diagram of the structure of a crankshaft in the prior art;

[0018] Figure 2 This is a schematic diagram of the crankshaft structure according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the crankshaft structure according to another embodiment of the present invention;

[0020] Figure 4 This is a top view of a crankshaft according to an embodiment of the present invention;

[0021] Figure 5 This is a partial schematic diagram of a compressor according to an embodiment of the present invention.

[0022] Figure label:

[0023] 10 Crankshaft 122 Second Oil Guide Groove

[0024] 11 Long shaft 123 First oil guide groove

[0025] 12 Eccentric part 124 Third oil guide groove

[0026] 13 Short shaft 21 Upper cylinder head

[0027] 14 Protrusion 22 Lower cylinder head

[0028] 15 Thrust section, 30 cylinders

[0029] 121 Oil outlet channel 40 Piston Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Figure 1 A schematic diagram of a crankshaft in the prior art is shown. (For example...) Figure 1 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. A protrusion 14' is provided on the end face of the eccentric portion 12' near the short shaft portion 13'. The eccentric portion 12' has an oil outlet channel 121' and a second oil guide groove 122'. When the crankshaft 10' rotates, lubricating oil in the compressor oil sump is pumped from the lower end of the central through-hole of the crankshaft 10' into the central through-hole. The lubricating oil in the central through-hole flows through the oil outlet channel 121' to the second oil guide groove 122', and then flows through the second oil guide groove 122' to the upper and lower end faces of the eccentric portion 12', achieving lubrication and sealing of the piston end face. Currently, the second oil guide groove 122' is insufficient to deliver lubricating oil to the protrusion 14', causing the protrusion 14' to wear more rapidly due to lack of oil. This affects the radial seal of the pump body and the piston end face seal, resulting in increased leakage within the compressor pump body and consequently affecting compressor performance.

[0035] To solve the above-mentioned technical problems, this utility model provides a crankshaft. Figures 2 to 4 A schematic diagram of the crankshaft provided in an embodiment of this utility model is shown. Figure 2 and Figure 3As 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; the crankshaft 10 has a central through hole inside, the eccentric portion 12 has a thrust portion 15, and the end face of the eccentric portion 12 near the short shaft portion 13 has a protrusion 14, which is used to cooperate with the piston of the compressor to jointly seal the exhaust port on the cylinder head of the compressor. The eccentric portion 12, the thrust portion 15, and the protrusion 14 enclose each other to form a first oil guide groove 123; the eccentric portion 12 is also provided with at least one oil outlet channel 121, a second oil guide groove 122, and a third oil guide groove 124. The first end of the oil outlet channel 121 is connected to the central through hole, and the second end of the oil outlet channel 121 extends to the outer wall of the eccentric portion 12; the two ends of the second oil guide groove 122 are respectively extended toward the end faces of the two axial ends of the eccentric portion 12; the third oil guide groove 124 is provided on the outer wall of the eccentric portion 12 and connects the first oil guide groove 123 and the second oil guide groove 122.

[0036] By setting a third oil guide groove 124 to connect the first oil guide groove 123 and the second oil guide groove 122, the rigidity of the crankshaft can be guaranteed while allowing lubricating oil to flow quickly from the second oil guide groove 122 to the first oil guide groove 123 through the third oil guide groove 124. This increases the amount of lubricating oil at the protrusion 14, reduces wear, is beneficial to the radial clearance sealing and end face sealing of the pump body, reduces pump body leakage, and improves the performance of the compressor.

[0037] Furthermore, in some embodiments, the third oil guide groove 124 is a straight groove, an inclined groove, a spiral groove, or an arc-shaped groove. For example, Figure 2 As shown, the third oil guide groove 124 is an inclined groove; as Figure 3 As shown, the third oil guide groove 124 is an arc-shaped groove. However, the specific configuration of the third oil guide groove 124 is not limited to the example above, and can be configured according to actual needs. No specific restrictions are imposed here.

[0038] Furthermore, in some embodiments, the width of the third oil guide groove 124 is uniform; in other embodiments, the width of the third oil guide groove 124 is not uniform. The width of the third oil guide groove 124 can be set according to actual needs, and no specific limitations are imposed here.

[0039] Furthermore, in some embodiments, the first and second ends of the third oil guide groove 124 are at the same height on the side wall of the eccentric portion 12. For example, the third oil guide groove 124 is arranged circumferentially at the same height along the outer wall of the eccentric portion 12.

[0040] Furthermore, in other embodiments, such as Figure 2 and Figure 3 As shown, the first and second ends of the third oil guide groove 124 are at different heights on the side wall of the eccentric part 12. The specific positions of the two ends of the third oil guide groove 124 can be set according to actual needs, and no specific restrictions are imposed here.

[0041] Furthermore, in some embodiments, such as Figure 4 As shown, taking the plane formed by the rotation center of crankshaft 10 and the rotation center of eccentric portion 12 as the reference plane (the position indicated by arrow a), on a plane perpendicular to the reference plane, the angle formed by the line connecting the projection of the starting point of the third oil guide groove 124 to the center of the long shaft portion 11 (crankshaft 10) and the line connecting the projection of the ending point of the third oil guide groove 124 to the center of the long shaft portion 11 (crankshaft 10) is θ; passing through the reference plane and pointing from the center of eccentric portion 12 to the center of long shaft 11 (crankshaft 10) is... At 0° (the position indicated by arrow b), within the range of 0° to 180° according to the rotation direction of crankshaft 10, the projection of thrust portion 15 on the plane is compared with the projection of eccentric portion 12 on the plane at point A. The angle between the line connecting point A to the center of crankshaft 10 and the reference plane is θ1. The projection of the end of protrusion 14 on the plane is compared with the projection of eccentric portion 12 on the plane at point B. The angle between the line connecting point B to the center of crankshaft 10 and the reference plane is θ2. θ satisfies θ1 < θ < θ2. By limiting the circumferential range of the third oil guide groove 124 in the eccentric portion 12, it is ensured that both ends of the third oil guide groove 124 connect to the second oil guide groove 122 and the first oil guide groove 123, while preventing the third oil guide groove 124 from falling into the high-load area of ​​the eccentric portion 12 of the crankshaft 10. This ensures that when connecting to the first oil guide groove 123, the impact on the load of the eccentric portion 12 is reduced, preventing the opening of the third oil guide groove 124 from reducing the load-bearing reliability of the eccentric portion 12, thereby improving the overall performance of the compressor. The high-load area of ​​the crankshaft is the area where the crankshaft bears a relatively large load during operation; in rotary compressors, the high-load area of ​​the crankshaft is usually located near the exhaust side.

[0042] Furthermore, embodiments of the present invention also provide a compressor including the crankshaft as described above. This compressor includes the crankshaft as described above, and therefore achieves all the technical advantages of a crankshaft, which will not be elaborated further here.

[0043] Furthermore, Figure 5 A partial schematic diagram of a compressor provided in an embodiment of the present invention is shown. Figure 5 As shown, the compressor also includes an upper cylinder head 21, a lower cylinder head 22, a cylinder 30, and a piston 40. The upper cylinder head 21 and the lower cylinder head 22 are located at both axial ends of the cylinder 30. The piston 40 is sleeved on the eccentric portion 12 and located inside the cylinder 30. The crankshaft 10 rotates, driving the piston 40 to periodically compress the refrigerant. In this embodiment, the lower cylinder head 22 is provided with a second exhaust port. The end face of the eccentric portion 12 near the lower cylinder head 22 is the second end face, and a protrusion 14 is provided on the second end face. The protrusion 14 cooperates with the piston 40 to seal the second exhaust port and prevent gas leakage.

[0044] Furthermore, in some other embodiments, the upper cylinder head 21 is provided with a first exhaust port, and the side end face of the eccentric portion 12 near the upper cylinder head 21 is a first end face, with a protrusion 14 provided on one side of the first end face. The protrusion 14 cooperates with the piston 40 to seal the first exhaust port and prevent gas leakage.

[0045] Furthermore, in some embodiments, when the upper cylinder head 21 has a first exhaust port and the lower cylinder head 22 has a second exhaust port, the protrusion 14 can be simultaneously provided on the end faces of both sides of the eccentric portion 12 to seal the first and second exhaust ports and prevent gas leakage. It should be noted that the number of cylinders and the exhaust method in the compressor can be set according to actual needs, and no specific limitations are made here.

[0046] In summary, the crankshaft and compressor provided by this utility model have the following advantages:

[0047] By setting a third oil guide groove to connect the first and second oil guide grooves, the rigidity of the crankshaft can be guaranteed, and the lubricating oil can flow quickly from the second oil guide groove to the first oil guide groove through the third oil guide groove, increasing the amount of lubricating oil at the protrusion, reducing wear, and facilitating the radial clearance sealing and end face sealing of the pump body.

[0048] 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 an eccentric portion and a central through hole therein, the eccentric portion having a thrust portion, and a protrusion on at least one end face of the eccentric portion, the protrusion being used to cooperate with a piston of a compressor to jointly seal the exhaust port on the cylinder head of the compressor, the eccentric portion, the thrust portion, and the protrusion forming a first oil guide groove, characterized in that, The eccentric portion is further provided with at least one oil outlet channel, a second oil guide groove and a third oil guide groove. The first end of the oil outlet channel is connected to the central through hole, and the second end of the oil outlet channel extends to the outer wall of the eccentric portion. The two ends of the second oil guide groove extend toward the axial end faces of the eccentric portion respectively. The third oil guide groove is provided on the outer wall of the eccentric portion and connects the first oil guide groove and the second oil guide groove.

2. The crankshaft of claim 1 wherein, The third oil guide groove is a straight groove, an inclined groove, a spiral groove, or an arc-shaped groove.

3. The crankshaft of claim 1 wherein, The width of the third oil guide groove is uniform.

4. The crankshaft of claim 1 wherein, The width of the third oil guide groove is uneven.

5. The crankshaft of claim 1 wherein, The first and second ends of the third oil guide groove are at the same height on the side wall of the eccentric part.

6. The crankshaft of claim 1 wherein, The first and second ends of the third oil guide groove are at different heights on the side wall of the eccentric part.

7. The crankshaft according to any one of claims 1 to 6, characterized in that Using the plane formed by the rotation center of the crankshaft and the rotation center of the eccentric part as the reference plane, on a plane perpendicular to the reference plane, the angle formed by the line connecting the projection of the starting point of the third oil guide groove to the center of the crankshaft and the line connecting the projection of the ending point of the third oil guide groove to the center of the crankshaft is θ; 0° is defined as passing through the reference plane and pointing from the center of the eccentric part to the center of the crankshaft. According to the rotation direction of the crankshaft, within the range of 0° to 180°, the projection of the thrust part on the plane and the projection of the eccentric part on the plane are compared at point A. The angle between the line connecting point A to the center of the crankshaft and the reference plane is θ1. The projection of the end of the protrusion on the plane and the projection of the eccentric part on the plane are compared at point B. The angle between the line connecting point B to the center of the crankshaft and the reference plane is θ2. θ satisfies θ1 < θ < θ2.

8. A compressor characterized by, Includes the crankshaft as described in any one of claims 1 to 7.

9. The compressor of claim 8, wherein, It also includes an upper cylinder head, a lower cylinder head, a cylinder, and a piston. The upper cylinder head and the lower cylinder head are located at both ends of the cylinder along its axial direction. The piston is sleeved on the eccentric part and located inside the cylinder.

10. The compressor of claim 9, wherein, The upper cylinder head is provided with a first exhaust port, the side face of the eccentric portion near the upper cylinder head is the first end face, and the protrusion is provided on one side of the first end face; and / or, the lower cylinder head is provided with a second exhaust port, the side face of the eccentric portion near the lower cylinder head is the second end face, and the protrusion is provided on the second end face.

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