Crankshaft, damping device of compressor and compressor

Abstract

The utility model relates to the technical field of compressors, in particular to a crankshaft which comprises a crankshaft body and an eccentric portion arranged on the crankshaft body, and the crankshaft body is provided with a shaft plane perpendicular to the direction, deviating from the crankshaft body, of the eccentric portion. The eccentric side part is located on one side of the shaft plane and deviates from the crankshaft body, the eccentric opposite side part is located on the other side of the shaft plane, and holes distributed in a dot matrix mode are formed in the eccentric side part. The utility model further relates to a damping device of the compressor, the damping device comprises the crankshaft and a piston arranged on the eccentric part of the crankshaft in a sleeving mode, and the overall mass center of the eccentric part and the piston is located on the rotating central axis of a crankshaft body. The utility model further relates to a compressor comprising the damping device. The holes distributed in the dot matrix mode are formed in the eccentric side portion, the mass of the eccentric side portion is reduced, the eccentric mass of the crankshaft eccentric portion can be reduced, the distance of the mass center of the crankshaft eccentric portion deviating from the rotating center axis of the crankshaft body is shortened, and the running stability of the compressor is improved.

Description

Crankshaft, compressor vibration damping device and compressor Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a crankshaft, a vibration damping device for a compressor including the crankshaft, and a compressor including the vibration damping device. Background Technology

[0002] Currently, rotary compressors are developing towards higher speeds, and in the pursuit of improved compressor efficiency, many companies are adopting a design strategy of reducing crankshaft diameter. For large-displacement single-cylinder compressors, this design trend brings new problems. Specifically, because the eccentric mass of the crankshaft eccentric part and piston is considerable, a large counterweight is required to maintain stable operation. However, as the counterweight volume increases and the compressor speed increases, significant centrifugal force is generated. For a relatively small crankshaft, this centrifugal force causes significant bending deformation, resulting in greater contact stress on the contact surface between the crankshaft and the upper cylinder head. Over time, this stress concentration may pose a potential threat to the compressor's operational reliability. Furthermore, as the speed increases, the centrifugal force increases rapidly, and the crankshaft deformation becomes more severe, which is highly detrimental to the development of high-speed compressors. Summary of the Invention

[0003] In view of the above-mentioned defects in the prior art, the technical problem to be solved by this utility model is to provide a vibration damping device for crankshaft and compressor, which can reduce the eccentric mass of crankshaft and facilitate stable operation of compressor.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This utility model provides a crankshaft, including a crankshaft body and an eccentric portion disposed on the crankshaft body. The crankshaft body has an axial plane perpendicular to the direction of the eccentric portion that deviates from the crankshaft body. The eccentric portion has an eccentric side portion located on one side of the axial plane and deviating from the crankshaft body, and an eccentric opposite side portion located on the other side of the axial plane. The eccentric side portion is provided with pores distributed in a dot matrix pattern inside.

[0006] Preferably, the density of the eccentric side is less than that of the opposite eccentric side, and the center of mass of the eccentric part is biased toward the opposite eccentric side.

[0007] Preferably, the density of the eccentric side and the density of the opposite eccentric side are respectively set to decrease and increase relative to the density of the crankshaft body.

[0008] Preferably, the eccentric side and the opposite eccentric side are made of the same material.

[0009] Preferably, the crankshaft is manufactured by 3D printing.

[0010] This utility model also provides a vibration damping device for a compressor, including a crankshaft as described above and a piston that is sleeved on an eccentric part of the crankshaft and driven to rotate by the eccentric part. The center of mass of the eccentric part and the piston is located on the rotation center axis of the crankshaft body.

[0011] Preferably, the piston is hollow, forming a cavity.

[0012] Preferably, the piston has pores arranged in a dot matrix pattern inside.

[0013] Preferably, the piston is made by 3D printing.

[0014] This utility model also provides a compressor, including the vibration damping device of the compressor as described above.

[0015] Compared with the prior art, this utility model has significant progress:

[0016] This invention alters the material distribution of the eccentric portion of the crankshaft by creating a lattice-shaped distribution of pores within the eccentric side. This results in a lower density on the eccentric side, reducing its mass and consequently decreasing the eccentric mass of the crankshaft. This reduces the distance between the center of mass of the eccentric portion and the rotational axis of the crankshaft body, thus helping to reduce vibration and noise during compressor operation and increasing the stability of compressor operation. Attached Figure Description

[0017] Figure 1 is a cross-sectional schematic diagram of one embodiment of the vibration damping device of the compressor according to this utility model.

[0018] Figure 2 is a cross-sectional schematic diagram of another embodiment of the vibration damping device of the compressor according to this utility model.

[0019] The reference numerals in the attached figures are explained as follows:

[0020] 1. Crankshaft body

[0021] 2. Eccentric part

[0022] 21. Eccentric side

[0023] 22 Eccentric contralateral part

[0024] 3 Pistons

[0025] 31 Cavity Detailed Implementation

[0026] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0027] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0030] Figures 1 and 2 show an embodiment of the crankshaft provided by this utility model.

[0031] The crankshaft of this embodiment includes a crankshaft body 1 and an eccentric portion 2. The eccentric portion 2 is provided on the crankshaft body 1, and the center of the eccentric portion 2 is offset from the center of the crankshaft body 1 radially, thereby forming a certain amount of eccentricity. The crankshaft body 1 has an axial plane perpendicular to the direction in which the eccentric portion 2 is offset from the crankshaft body 1, and this axial plane passes through the rotation center axis of the crankshaft body 1. The eccentric portion 2 has an eccentric side portion 21 located on one side of the axial plane and offset from the crankshaft body 1, and an eccentric opposite side portion 22 located on the other side of the axial plane. The eccentric side 21 has pores distributed in a dot matrix pattern inside. That is, the material medium of the eccentric side 21 is a solid material with pores inside, which makes the eccentric side 21 have a small density, thereby reducing the mass of the eccentric side 21. Therefore, it can reduce the eccentric mass of the crankshaft eccentric part 2 and shorten the distance between the center of mass of the crankshaft eccentric part 2 and the rotation center axis of the crankshaft body 1. This is beneficial to reduce the vibration and noise during compressor operation and increase the stability of compressor operation.

[0032] In this embodiment, preferably, the density of the eccentric side portion 21 of the eccentric portion 2 is less than the density of the eccentric opposite side portion 22, thereby causing the center of mass of the eccentric portion 2 to be biased towards the eccentric opposite side portion 22. The material medium of the eccentric opposite side portion 22 can be a solid material with internal pores, and the porosity of the eccentric opposite side portion 22 is less than the porosity of the eccentric side portion 21, making the density of the eccentric opposite side portion 22 greater than the density of the eccentric side portion 21; the material medium of the eccentric opposite side portion 22 can also be a solid material without internal pores, thus making the density of the eccentric opposite side portion 22 greater than the density of the eccentric side portion 21. The eccentric portion 2, composed of the eccentric side portion 21 and the eccentric opposite side portion 22, is a solid structure except for the necessary oil passage openings.

[0033] Therefore, in this embodiment, the crankshaft, by changing the material medium distribution of the eccentric portion 2, employs a non-uniform material medium distribution strategy for the eccentric side portion 21 and the eccentric opposite side portion 22 of the eccentric portion 2, making the density of the eccentric side portion 21 less than that of the eccentric opposite side portion 22. This causes the center of mass of the eccentric portion 2 to be biased towards the eccentric opposite side portion 22. Furthermore, by designing the relative magnitudes of the density of the eccentric side portion 21 and the eccentric opposite side portion 22, the positional design of the center of mass of the eccentric portion 2 biased towards the eccentric opposite side portion 22 can be achieved. Thus, when the crankshaft is used in conjunction with the piston 3, since the center of mass of the piston 3, which is sleeved on the eccentric portion 2 of the crankshaft, is biased towards the eccentric side portion 21, the positional design of the center of mass of the eccentric portion 2 and the piston can be achieved. When the center of mass of eccentric part 2 and piston 3 are balanced, the center of mass of the eccentric part 2 and piston 3 is located on the rotation center axis of crankshaft body 1, that is, the center of mass of the eccentric part 2 and piston 3 is located at the origin. Then the compressor will not need to design an additional balance block to compensate for the offset of the center of mass of the crankshaft eccentric part and piston. It can realize the compressor design without relying on the balance block. This not only simplifies the compressor structure, but also effectively avoids vibration and noise caused by the offset of the center of mass of the eccentric part 2 and piston 3, improves the smoothness and reliability of compressor operation, improves the overall performance and efficiency of compressor, and realizes the stable operation of compressor without relying on the balance block. This provides new possibilities for high-speed design and efficiency improvement of compressor.

[0034] In this embodiment, preferably, the density of the eccentric side portion 21 and the density of the opposite eccentric side portion 22 of the eccentric portion 2 are respectively reduced and increased relative to the density of the crankshaft body 1. That is, the density of the material medium is reduced on the eccentric side (eccentric side portion 21) of the crankshaft eccentric portion 2, while the density of the material medium is increased on the opposite side (opposite eccentric side portion 22) of the eccentric side of the eccentric portion 2. This makes it easier to make the center of mass of the crankshaft eccentric portion 2 shift to the other side of the eccentricity (i.e., to the opposite eccentric side portion 22).

[0035] In this embodiment, the eccentric side 21 and the eccentric opposite side 22 of the crankshaft eccentric portion 2 are made of the same material. Preferably, the crankshaft eccentric portion 2 and the crankshaft body 1 are made of the same material.

[0036] In this embodiment, preferably, the crankshaft is manufactured by 3D printing. Through material proportioning design, the eccentric side 21 and the opposite eccentric side 22 of the crankshaft eccentric part 2 can have different densities, while ensuring that the overall strength and durability of the crankshaft are not affected. 3D printing makes the crankshaft manufacturing process more flexible and efficient, improves the manufacturing precision of the crankshaft, especially precisely controlling the relative density of the eccentric side 21 and the opposite eccentric side 22 of the crankshaft eccentric part 2, thereby precisely controlling the position of the center of mass of the eccentric part 2 towards the opposite eccentric side 22, thus providing a strong guarantee for the realization of the center of mass balance of the crankshaft eccentric part 3 and the piston 3.

[0037] As shown in Figures 1 and 2, based on the crankshaft of this utility model, this embodiment of the utility model also provides a vibration damping device for a compressor. The vibration damping device for the compressor in this embodiment includes the crankshaft described above and a piston 3 that is sleeved on the eccentric part 2 of the crankshaft and rotated by the eccentric part 2. The overall center of mass of the eccentric part 2 and the piston 3 is located on the rotation center axis of the crankshaft body 1, that is, the overall center of mass of the eccentric part 2 and the piston 3 is located at the origin.

[0038] Preferably, by setting the density of the eccentric side 21 to be less than the density of the opposite eccentric side 22, the center of mass of the eccentric part 2 is biased towards the opposite eccentric side 22, thereby ensuring that the overall center of mass of the eccentric part 2 and the piston 3 is located on the rotational axis of the crankshaft body 1. Since the center of mass of the piston 3, which is sleeved on the eccentric part 2 of the crankshaft, is biased towards the eccentric side 21, the relative size of the density of the eccentric side 21 and the opposite eccentric side 22 can be designed to allow the center of mass of the eccentric part 2 to be biased towards the opposite eccentric side 22. This achieves a balance between the center of mass of the eccentric part 2 and the center of mass of the piston 3, ensuring that the overall center of mass of the eccentric part 2 and the piston 3 is located on the rotational axis of the crankshaft body 1.

[0039] Therefore, compressors using this vibration damping device will no longer need to design additional balance blocks to compensate for the offset of the crankshaft eccentricity and the overall center of mass of the piston. This enables compressor designs that do not rely on balance blocks, which not only simplifies the compressor structure but also effectively avoids vibration and noise caused by the offset of the overall center of mass of the eccentric part 2 and the piston 3. This improves the smoothness and reliability of compressor operation, enhances the overall performance and efficiency of the compressor, and enables the compressor to operate stably without relying on balance blocks. This provides new possibilities for high-speed design and efficiency improvement of compressors.

[0040] In this embodiment, referring to Figure 1, in one implementation, preferably, the piston 3 has a hollow structure, that is, the piston 3 has a hollow cavity 31 inside, and the cavity 31 is preferably a sealed cavity. The piston 3 is annular and has radially spaced inner and outer peripheral walls, and the cavity 31 is located between the inner and outer peripheral walls of the piston 3. The hollow structure of the piston 3 reduces the mass of the piston 3, providing strong support for the realization of the center-of-mass balance between the piston 3 and the crankshaft eccentric part 3, while also improving the durability and performance of the piston 3.

[0041] In this embodiment, referring to Figure 2, in another implementation, preferably, the piston 3 has pores distributed in a dot matrix pattern inside, that is, the material medium of the piston 3 is a solid material with pores inside, so that the piston 3 has a small density, thereby reducing the mass of the piston 3, providing strong support for the realization of the center of mass balance between the piston 3 and the crankshaft eccentric part 3, and at the same time improving the durability and performance of the piston 3.

[0042] In this embodiment, preferably, the piston 3 is manufactured by 3D printing. 3D printing makes the manufacturing process of the piston 3 more flexible and efficient, enabling precise control of the piston 3 structure and lightweight design, thereby reducing production costs and time.

[0043] Based on the vibration damping device of the compressor of this utility model, this utility model embodiment also provides a compressor. The compressor of this embodiment includes the vibration damping device of the compressor described above. The compressor of this embodiment does not require an additional balance block to compensate for the offset of the crankshaft eccentric part and the overall center of mass of the piston, realizing a design that does not rely on a balance block. This not only simplifies the structure, but also effectively avoids vibration and noise caused by the offset of the overall center of mass of the eccentric part 2 and the piston 3, improves the smoothness and reliability of operation, improves the overall performance and efficiency, and achieves stable operation without relying on a balance block, providing new possibilities for high-speed design and efficiency improvement.

[0044] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A crankshaft, characterized by The crankshaft includes a crankshaft body (1) and an eccentric portion (2) disposed on the crankshaft body (1). The crankshaft body (1) has an axial plane perpendicular to the direction in which the eccentric portion (2) deviates from the crankshaft body (1). The eccentric portion (2) has an eccentric side portion (21) located on one side of the axial plane and deviating from the crankshaft body (1) and an eccentric opposite side portion (22) located on the other side of the axial plane. The eccentric side portion (21) is provided with pores distributed in a dot matrix pattern inside.

2. The crankshaft of claim 1 wherein, The density of the eccentric side (21) is less than that of the eccentric opposite side (22), and the center of mass of the eccentric part (2) is biased toward the eccentric opposite side (22).

3. The crankshaft of claim 2, wherein The density of the eccentric side (21) and the density of the eccentric opposite side (22) are respectively set to decrease and increase relative to the density of the crankshaft body (1).

4. The crankshaft according to any one of claims 1 to 3, characterized in that, The eccentric side (21) and the eccentric opposite side (22) are made of the same material.

5. The crankshaft according to any one of claims 1 to 3, characterized in that, The crankshaft is made by 3D printing.

6. A vibration damping device for a compressor, characterized in that, Includes a crankshaft as described in any one of claims 1 to 5 and a piston (3) that is fitted onto the eccentric portion (2) of the crankshaft and rotated by the eccentric portion (2), wherein the center of mass of the eccentric portion (2) and the piston (3) is located on the rotational center axis of the crankshaft body (1).

7. The damping device of a compressor according to claim 6, characterized by The piston (3) has a hollow interior forming a cavity (31).

8. The damping device of a compressor according to claim 6, characterized by The piston (3) has pores arranged in a dot matrix pattern inside.

9. The vibration damping device for the compressor according to claim 6, characterized in that, The piston (3) is made by 3D printing.

10. A compressor characterized by, Includes a vibration damping device for the compressor as described in any one of claims 6 to 9.

Images