A crankshaft balance assembly and a compressor

Abstract

The present disclosure provides a crankshaft balance assembly and a compressor. The crankshaft balance assembly includes: a crankshaft, a lower flange, a crankshaft balance weight, and a sealing structure. The crankshaft includes a long shaft, an eccentric shaft, and a short shaft. The lower flange is sleeved on the short shaft to support the short shaft. The sealing structure is further provided on the short shaft. An exhaust cavity is formed between the sealing structure and the lower flange. The crankshaft balance weight is connected to the short shaft and is located in the exhaust cavity. According to the present disclosure, it is possible to avoid the problem of the lengthening of the lower cavity series caused by separately adding a balance cavity, and solve the problem of the upward shift of the pump body center of gravity; it is also possible to avoid problems such as increased power consumption, unstable shafting, and poor reliability caused by the crankshaft balance weight stirring oil during operation, and effectively solve the problem of the balance weight stirring oil; and the shape design of the crankshaft balance weight in the present disclosure is not restricted, and it is easy to realize processing and assembly.

Description

Technical Field

[0001] The present disclosure relates to the technical field of compressors, and particularly relates to a crankshaft balance assembly and a compressor. Background Art

[0002] In a conventional vertical rotor compressor, due to the existence of the eccentric part of the crankshaft and the eccentric movement of the roller, balance weights are usually arranged at the upper and lower ends of the rotor respectively to offset the unbalanced force and torque. However, for large-capacity rotor compressors, especially double-cylinder or multi-cylinder compressors, the cylinder diameter, cylinder height, and bearing span are large, the eccentric mass of the rotor is large, and the rotational inertia arm is long, resulting in excessive deflection of the crankshaft during high-frequency operation of the compressor, which easily causes biting wear between the crankshaft and the bearing, affecting the reliability of the compressor. Currently, by adding a balance weight at the lower part of the crankshaft, the weight of the balance weight required at the upper end of the motor rotor is reduced, thereby reducing the deformation of the eccentric crankshaft and improving the stability of the shafting and the reliability of the compressor.

[0003] Patents with patent numbers CN204371682U, CN103527482B, and CN203614415U disclose that an eccentric part and a balance part are arranged at intervals along the axial direction on the crankshaft of a single-cylinder compressor. The eccentric part is located in the compression chamber, and the balance part is located in a balance chamber separately defined below the cylinder. This structure separately adds a chamber for placing the crankshaft balance structure, resulting in an overly long lower chamber, complex structure, and upward movement of the pump body center of gravity, thereby causing unstable operation and increased vibration of the compressor; at the same time, its balance chamber is connected to the oil sump, which will cause the crankshaft balance weight to stir the oil during operation, resulting in increased power consumption and unstable shafting, further affecting the reliability of the compressor;

[0004] Patents with patent numbers CN103486036B and CN110685911A have their balance chambers arranged in a sealed or partially enclosed cavity, which can avoid excessive oil stirring of the oil sump by the crankshaft balance weight during operation to a certain extent, but also separately add a chamber for placing the crankshaft balance weight, and there are also problems such as an overly long lower chamber, upward movement of the pump body center of gravity, and adverse effects such as unstable operation and increased vibration of the compressor.

[0005] Since the compressor in the prior art needs to separately set up a chamber for placing the crankshaft balance weight when setting the crankshaft balance weight, this will lead to problems such as an overly long lower chamber, upward movement of the pump body center of gravity, and adverse effects such as unstable operation and increased vibration of the compressor. Therefore, the present disclosure researches and designs a crankshaft balance assembly and a compressor.

[0006] Disclosed content

[0007] Therefore, the technical problem to be solved by the present disclosure is to overcome the defects of the compressor in the prior art that when setting the crankshaft balance weight, a separate cavity needs to be set to place the crankshaft balance weight, which will cause the lower cavity to be too long, the center of gravity of the pump body to move upward, and the adverse effects such as unstable operation and increased vibration of the compressor, so as to provide a crankshaft balance assembly and a compressor.

[0008] To solve the above problems, the present disclosure provides a crankshaft balance assembly, which includes:

[0009] A crankshaft, a lower flange, a crankshaft balance weight and a sealing structure. The crankshaft includes a long shaft, an eccentric shaft and a short shaft. The lower flange is sleeved on the short shaft to support the short shaft. The sealing structure is also arranged on the short shaft. An exhaust cavity is formed between the sealing structure and the lower flange. The crankshaft balance weight is connected to the short shaft and is located in the exhaust cavity.

[0010] In some embodiments, the sealing structure includes a cover plate. The cover plate is sleeved on the axial end of the short shaft, and the cover plate is fixedly connected to the lower flange. The short shaft can rotate relative to the lower flange and the cover plate.

[0011] In some embodiments, the sealing structure further includes a seal. The seal is fixedly connected to the axial end of the short shaft. The axial end of the short shaft passes through the cover plate and is fixedly connected to the seal. The seal is in sealed connection with the cover plate.

[0012] In some embodiments, the seal is an oil pump structure. The oil pump structure can rotate with the rotation of the short shaft to pump oil.

[0013] In some embodiments, the crankshaft balance weight includes an eccentric part and a central part. The central part is sleeved on the short shaft, and the center of the central part is concentric with the center of the short shaft. The eccentric part is connected and arranged at the radially outer end of the central part, and the centroid of the eccentric part is eccentric with the center of the short shaft.

[0014] In some embodiments, the central part is a cylindrical barrel structure, and the eccentric part is a fan-shaped columnar structure.

[0015] In some embodiments, when including a seal:

[0016] The crankshaft balance weight further includes a convex part. One end of the convex part is connected to the central part, and the other end extends towards the seal. The convex part extends out of the cover plate and is connected to the seal.

[0017] In some embodiments, the short shaft includes a first mating shaft section, a second mating shaft section, and a third mating shaft section arranged in sequence along its axial direction. The first mating shaft section mates with the lower flange, the second mating shaft section mates with the crankshaft balance weight, the third mating shaft section mates with the seal, and the outer diameters of the first mating shaft section, the second mating shaft section, and the third mating shaft section are all different from each other.

[0018] In some embodiments, the outer diameter of the first mating shaft section is greater than the outer diameter of the second mating shaft section; and / or, the crankshaft balance weight is press-fitted with the second mating shaft section, or the crankshaft balance weight is fixedly connected to the second mating shaft section through a keyway, or the crankshaft balance weight and the second mating shaft section are integrally formed.

[0019] In some embodiments, the crankshaft balance weight is connected to the short shaft by bolts; or the crankshaft balance weight is connected to the short shaft by riveting or fixedly connected through a keyway, or the crankshaft balance weight and the short shaft are integrally formed.

[0020] In some embodiments, in the projection plane perpendicular to the axis of the crankshaft, the centroid of the crankshaft balance weight and the centroid of the adjacent eccentric shaft are relatively distributed with a phase difference of 180°; a rotor balance weight is further included, and the rotor balance weight is connected to the motor rotor, and the centroid of the crankshaft balance weight and the centroid of the rotor balance weight are relatively distributed with a phase difference of 180°.

[0021] In some embodiments, a counterbore is further provided on the cover plate. The counterbore communicates with the exhaust cavity, and at least a part of the crankshaft balance weight is disposed in the counterbore and can rotate in the counterbore.

[0022] In some embodiments, a partition cover is further included. The partition cover is disposed in the exhaust cavity. The partition cover covers the outside of the crankshaft balance weight, so that the crankshaft balance weight is located in the cavity surrounded by the partition cover. The partition cover is fixedly connected to the cover plate and / or the lower flange.

[0023] The present disclosure further provides a compressor, which includes the crankshaft balance assembly described in any one of the preceding items.

[0024] A crankshaft balance assembly and a compressor provided by the present disclosure have the following beneficial effects:

[0025] The present disclosure can enable the crankshaft balance weight to balance the eccentric part of the crankshaft by providing an exhaust cavity between the sealing structure and the lower flange, and arranging the crankshaft balance weight in the exhaust cavity and connecting it to the short shaft of the crankshaft. Moreover, there is no need to separately add a cavity to place the crankshaft balance weight, avoiding the problem of the lengthening of the lower cavity series caused by adding a separate balance cavity, preventing the center of gravity of the lengthened pump body from rising, solving the problem of the rising center of gravity of the pump body, making full use of the space, significantly reducing the size of the pump body in the axial direction, being beneficial to the stability of the compressor operation, and further improving the vibration and reliability of the compressor. And since the crankshaft balance weight of the present disclosure is arranged in the exhaust cavity of the lower flange and is installed in cooperation with the short shaft of the crankshaft, there is a sealing structure between the crankshaft and the cover plate, which is completely isolated from the oil sump, avoiding problems such as increased power consumption, unstable shafting, and poor reliability caused by the crankshaft balance weight churning oil during operation, effectively solving the problem of the balance weight churning oil. And the shape design of the crankshaft balance weight of the present disclosure is not restricted, and it is easy to realize processing and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a longitudinal sectional view of the crankshaft balance assembly according to the first embodiment of the present disclosure;

[0027] Figure 2a is Figure 1 the top view of the crankshaft balance weight in

[0028] Figure 2b is Figure 2a the A-A sectional view of the crankshaft balance weight in

[0029] Figure 3 is Figure 1 the balance structure diagram of the crankshaft, the rotor balance weight and the crankshaft balance weight in

[0030] Figure 4 is Figure 1 the longitudinal sectional view of the cover plate in

[0031] Figure 5 is a longitudinal sectional view of the crankshaft balance assembly according to the second embodiment of the present disclosure;

[0032] Figure 6a is Figure 5 the top view of the crankshaft balance weight in

[0033] Figure 6b is Figure 6a the B-B sectional view of the crankshaft balance weight in

[0034] Figure 7a is a longitudinal sectional view of the crankshaft balance assembly according to the third embodiment of the present disclosure;

[0035] Figure 7b is Figure 7a the first variant embodiment of

[0036] Figure 7c The second variant embodiment of Figure 7a is as follows.

[0037] The reference numerals are shown as:

[0038] 1. Crankshaft; 1a. Long shaft; 1b. Eccentric shaft; 1b1. First eccentric shaft; 1b2. Second eccentric shaft; 1c. Short shaft; 1c1. First mating shaft section; 1c2. Second mating shaft section; 1c3. Third mating shaft section; 2. Rotor; 3. Rotor balance weight; 4. Upper flange; 5. First cylinder; 6. First partition; 7. Second partition; 8. Second cylinder; 9. Lower flange; 10. Cover plate; 101. Sunk groove; 11. Seal; 12. Crankshaft balance weight; 12a. Eccentric part; 12b. Central part; 12c. Protrusion; 13. Second roller; 14. First roller; 15. Isolation cover; 100. Exhaust cavity; 21. First eccentric part; 22. Second eccentric part. Specific implementation manner

[0039] In the first embodiment, as Figures 1 - 4 shown, the present disclosure provides a crankshaft balance assembly, which includes:

[0040] A crankshaft 1, a lower flange 9, a crankshaft balance weight 12 and a sealing structure, the crankshaft 1 includes a long shaft 1a, an eccentric shaft 1b and a short shaft 1c, the lower flange 9 is sleeved on the short shaft 1c to support the short shaft 1c, and the sealing structure is further arranged on the short shaft 1c, an exhaust cavity 100 is formed between the sealing structure and the lower flange 9, and the crankshaft balance weight 12 is connected to the short shaft 1c and is located in the exhaust cavity 100. The sealing structure isolates the exhaust cavity from the oil sump.

[0041] The present disclosure can enable the crankshaft balance weight to balance the eccentric part of the crankshaft by providing an exhaust cavity between the sealing structure and the lower flange, and arranging the crankshaft balance weight in the exhaust cavity and connecting it to the short shaft of the crankshaft. Moreover, there is no need to separately add a cavity to place the crankshaft balance weight, avoiding the problem of the lengthening of the lower cavity series caused by separately adding a balance cavity, preventing the upward movement of the center of gravity of the lengthened pump body, solving the problem of the upward movement of the pump body center of gravity, making full use of the space, greatly reducing the size of the pump body in the axial direction, being beneficial to the stability of the compressor operation, and further improving the vibration and reliability of the compressor. And since the crankshaft balance weight of the present disclosure is arranged in the exhaust cavity of the lower flange and is installed in cooperation with the short shaft of the crankshaft, there is a sealing structure between the crankshaft and the cover plate, which is completely isolated from the oil sump, avoiding problems such as increased power consumption, unstable shafting, and poor reliability caused by the crankshaft balance weight churning oil during operation, effectively solving the problem of the balance weight churning oil. And the shape design of the crankshaft balance weight of the present disclosure is not restricted, and it is easy to realize processing and assembly. The crankshaft balance weight pump body structure of the present application has a simple structure and reasonable layout, will not cause an increase in the power consumption of the compressor, and has stable shafting, high reliability, and small vibration.

[0042] As Figure 1 shown, the pump body rotor assembly structure of the present application is sequentially provided with a rotor, a rotor balance weight, an upper flange, a cylinder, rollers, sliding vanes (not shown), a lower flange, a crankshaft balance weight, a cover plate, and a seal along the axial direction of the crankshaft from top to bottom;

[0043] Among them, the crankshaft includes a long shaft, an eccentric shaft, and a short shaft;

[0044] The lower flange supports the short shaft of the crankshaft and has an exhaust cavity;

[0045] The sealing structure includes a cover plate and a seal; the upper end surface of the cover plate is connected to the lower end surface of the lower flange; the lower end surface of the cover plate is connected to the seal; the sealing structure isolates the exhaust cavity from the oil sump in the compressor housing;

[0046] As Figures 2a - 2b shown, a kind of crankshaft balance weight of the present application is connected to the short shaft of the crankshaft and is received in the exhaust cavity of the lower flange; compared with adding a separate balance cavity in the prior art, it avoids the lengthening of the lower cavity of the pump body, reasonably utilizes the space, greatly reduces the size of the pump body in the axial direction, and is beneficial to improving the stability and reliability of the shafting.

[0047] Combined with the above sealing structure and the exhaust cavity of the lower flange, the crankshaft balance weight is arranged in a closed cavity completely isolated from the oil sump, solving the problem of the crankshaft balance weight churning oil during operation in the prior art, thereby avoiding the increased power consumption and unstable shafting caused by churning oil.

[0048] In some embodiments, the sealing structure includes a cover plate 10. The cover plate 10 is sleeved on the axial end of the short shaft 1c, and the cover plate 10 is fixedly connected to the lower flange 9. The short shaft 1c can rotate relative to the lower flange 9 and the cover plate 10. This is a preferred structural form of the sealing structure of the present disclosure. By the cover plate being able to be fixedly connected to the lower flange and effectively forming a sealed exhaust cavity, the compressed gas in the compressor pump body cylinder can enter this exhaust cavity. And the crankshaft balance weight is arranged in the exhaust cavity, which can prevent the balance weight from agitating the oil and will not add an additional cavity, avoiding the center of gravity of the pump body from rising due to the additional cavity at the lower part, making the structure more compact. The cover plate is a support structure and cooperates with the short shaft of the crankshaft.

[0049] Further, the cover plate is a support structure and has a clearance fit with the short shaft of the crankshaft, and is used to support the short shaft of the crankshaft, reduce the bending deformation of the crankshaft, relieve the supporting effect of the upper and lower flanges on the crankshaft, reduce the wear of the crankshaft and the upper bearing, and strengthen and improve the stability of the shafting.

[0050] In some embodiments, the sealing structure further includes a seal 11. The seal 11 is fixedly connected to the axial end of the short shaft 1c. The axial end of the short shaft 1c penetrates through the cover plate 10 and is fixedly connected to the seal 11. The seal 11 is in sealing connection with the cover plate 10. The present disclosure also uses the seal to seal the connection between the cover plate and the axial end of the short shaft.

[0051] In some embodiments, the seal 11 is an oil pump structure. The oil pump structure can rotate with the rotation of the short shaft 1c to pump oil. This is a preferred structural form of the seal of the present disclosure. Through the oil pump structure, while sealing, it can also rotate to pump the oil at the bottom upward to the position of the moving friction pair for lubrication. The seal is preferably a gear oil pump structure, which has both the functions of pumping oil and one-way sealing.

[0052] Preferably, the seal can be a gear oil pump structure, which takes into account the functions of pumping oil with the rotation of the crankshaft and one-way sealing; the gear oil pump has a large oil supply, and it is easy to form an oil film in the gaps of the pump body parts and bearings, and thus it is not easy to generate wear.

[0053] In some embodiments, the crankshaft balance weight 12 includes an eccentric part 12a and a central part 12b. The central part 12b is sleeved on the short shaft 1c, and the center of the central part 12b is concentric with the center of the short shaft 1c. The eccentric part 12a is connected and arranged at the radial outer end of the central part 12b, and the center of mass of the eccentric part 12a is eccentric with the center of the short shaft 1c. This is a preferred structural form of the crankshaft balance weight of the present disclosure. Through the central part, it can be effectively fixedly connected to the short shaft of the crankshaft, and through the eccentric part, it can play an eccentric role, generating a balance effect of dynamic eccentric mass and eccentric moment.

[0054] In some embodiments, the central portion 12b is a cylindrical barrel structure, and the eccentric portion 12a is a sector-shaped columnar structure. The central portion of the present disclosure is preferably a cylindrical barrel, which can be firmly sleeved on the short shaft. The eccentric portion with a sector-shaped columnar structure can play a role in eccentric balance of mass and torque.

[0055] Embodiment Two:

[0056] In some embodiments, when the seal 11 is included:

[0057] The crankshaft balance weight 12 further includes a protrusion 12c. One end of the protrusion 12c is connected to the central portion 12b, and the other end extends towards the direction of the seal 11. The protrusion 12c extends out of the cover plate 10 and is connected to the seal 11. Preferably, the seal is sleeved on the protrusion. This is the preferred structural form of Embodiment Two of the present disclosure. By providing the protrusion, it can penetrate through the cover plate and be inserted into the seal, which can further effectively improve the sealing effect.

[0058] Different from Embodiment One, as Figures 5 to 6b shown: A crankshaft balance weight structure, the crankshaft balance weight having an eccentric portion, a central portion, and a protrusion; the axis of the central portion is collinear with the rotation center line of the crankshaft and is connected to the short shaft of the crankshaft; the protrusion is connected to the seal; the centroid of the eccentric portion is eccentrically arranged relative to the rotation center of the crankshaft;

[0059] Specifically, the crankshaft balance weight and the short shaft of the crankshaft are connected by bolts; threaded holes are provided at both the lower ends of the crankshaft balance weight and the short shaft of the crankshaft.

[0060] Optionally, the crankshaft balance weight and the short shaft of the crankshaft can also be connected by riveting;

[0061] Optionally, the crankshaft balance weight and the short shaft of the crankshaft are fixedly connected by a keyway;

[0062] Optionally, the crankshaft balance weight and the short shaft are integrally formed by casting or digital milling, etc.;

[0063] The crankshaft balance weight structure of this embodiment can further simplify the pump body structure, and is easy for the processing of pump body components and the installation and positioning of the crankshaft balance weight.

[0064] In some embodiments, the short shaft 1c includes a first mating shaft section 1c1, a second mating shaft section 1c2, and a third mating shaft section 1c3 arranged in sequence along its axis direction. The first mating shaft section 1c1 mates with the lower flange 9, the second mating shaft section 1c2 mates with the crankshaft balance weight 12, and the third mating shaft section 1c3 mates with the seal 11. The outer diameters of the first mating shaft section 1c1, the second mating shaft section 1c2, and the third mating shaft section 1c3 are different from each other. The short shaft of the present disclosure preferably includes three mating shaft sections, which can respectively cooperate with the lower flange, the crankshaft balance weight, and the seal.

[0065] In some embodiments, the outer diameter of the first mating shaft section 1c1 is greater than the outer diameter of the second mating shaft section 1c2; and / or, the crankshaft balance weight 12 is press-fitted with the second mating shaft section 1c2, or the crankshaft balance weight 12 is fixedly connected to the second mating shaft section 1c2 through a keyway, or the crankshaft balance weight 12 is integrally formed with the second mating shaft section 1c2. Since the inner diameter of the lower flange is larger than the inner diameter of the crankshaft balance weight, the outer diameter of the first mating shaft section is greater than the outer diameter of the second mating shaft section; and preferably, the crankshaft balance weight can be press-fitted, keyway-fitted, or integrally formed with the second mating shaft section, so that the crankshaft balance weight is firmly fixed to the second mating shaft section of the short shaft.

[0066] Further, as Figure 1 and Figure 3 shown, along the axis direction of the crankshaft, the crankshaft short shaft is sequentially provided with mating shaft sections having different outer diameters downward; the mating shaft sections include: a first mating shaft section, which mates with the lower flange; a second mating shaft section, which mates with the crankshaft balance weight; a third mating shaft section, which mates with the seal;

[0067] The outer diameter of the first mating shaft section is greater than that of the second mating shaft section; such a setting can axially limit the crankshaft balance weight by using the first mating shaft section of the crankshaft.

[0068] At the same time, the crankshaft balance weight is press-fitted with the first mating shaft section together and installed by cold pressing or hot sleeving; alternatively, the crankshaft balance weight is fixedly connected to the first mating shaft section through a keyway; alternatively, the crankshaft balance weight is integrally formed with the first mating shaft section.

[0069] In some embodiments, the crankshaft balance weight 12 is connected to the short shaft 1c by bolts; or the crankshaft balance weight 12 is connected to the short shaft 1c by riveting or through a keyway, or the crankshaft balance weight 12 is integrally formed with the short shaft 1c. The crankshaft balance weight of the present disclosure can be fixedly assembled to the short shaft by screwing, riveting, keyway, or integral forming.

[0070] Furthermore, the interference amount of the crankshaft balance weight and the short shaft of the crankshaft in interference fit is (0.02 - 0.04) mm, which can not only avoid the problems of loosening or displacement of the crankshaft balance weight caused by vibration during high-speed operation, but also prevent excessive interference amount, difficult assembly and adverse effects such as deformation and displacement of the pump body caused by assembly.

[0071] In some embodiments, in the projection plane perpendicular to the axis of the crankshaft 1, the centroid of the crankshaft balance weight 12 and the centroid of the adjacent eccentric shaft 1b are relatively distributed with a phase difference of 180°. It further includes a rotor balance weight 3, which is connected to the motor rotor, and the centroid of the crankshaft balance weight 12 and the centroid of the rotor balance weight 3 are relatively distributed with a phase difference of 180°. Through the centroid of the crankshaft balance weight and the centroid of the eccentric shaft having a phase difference of 180°, the present disclosure can effectively balance the mass and torque of the eccentric part of the crankshaft; through the centroid of the crankshaft balance weight and the centroid of the rotor balance weight having a phase difference of 180°, it can effectively balance the mass and torque of the eccentric part of the crankshaft, effectively reduce the weight of the rotor balance weight, lower the entire balance system, and minimize the deflection at the top of the crankshaft while ensuring the balance of the shafting.

[0072] As Figure 3 shown, the crankshaft balance weight is eccentrically arranged relative to the rotation center of the crankshaft; the centroid of the crankshaft balance weight and the centroid of the adjacent crankshaft eccentric shaft are relatively distributed with a phase difference of 180°; preferably, the rotor balance weight is arranged at the lower end of the rotor near the pump body side and is relatively arranged with a phase difference of 180° from the centroid of the crankshaft balance weight; the crankshaft balance weight pump body structure of the present application satisfies:

[0073] M1*R1 + M3*R3 = M2*R2 + M4*R4

[0074] M1*R1*L1 + M2*R2*L2 + M3*R3*L3 = M4*R4*L4

[0075] As described above: the torques of the rotor balance weight, the crankshaft balance weight and the adjacent eccentric part of the crankshaft (the second eccentric part 22 in the figure) jointly balance the torque of the eccentric part far from the crankshaft balance weight (the first eccentric part 21 in the figure). Such a setting can effectively reduce the weight of the rotor balance weight, lower the entire balance system, minimize the deflection at the top of the crankshaft while ensuring the balance of the shafting, reduce the wear of the upper and lower flanges, reduce power consumption, improve the stability and reliability of the shafting, especially with more obvious improvement effects during high-speed and high-load operation, and at the same time reduce the vibration of the compressor and improve the comprehensive performance of the compressor.

[0076] In some embodiments, a sunk groove 101 is further provided on the cover plate 10. The sunk groove 101 communicates with the exhaust cavity 100, and at least part of the crankshaft balance weight 12 is disposed in the sunk groove 101 and can rotate in the sunk groove 101. The present disclosure can effectively accommodate the crankshaft balance weight therein and perform rotational movement through the sunk groove, and effectively limit the position of the crankshaft balance weight. The cover plate includes a sunken groove that communicates with the exhaust cavity. It is used to avoid the crankshaft balance weight, so as to facilitate the layout of the lower cavity, and the pump body assembly is simple and easy to implement.

[0077] Embodiment 3, as Figures 7a - 7c , in some embodiments, an isolation cover 15 is further included. The isolation cover 15 is disposed in the exhaust cavity 100, and the isolation cover 15 covers the outside of the crankshaft balance weight 12, so that the crankshaft balance weight 12 is located in the cavity surrounded by the isolation cover 15. The isolation cover 15 is fixedly connected to the cover plate 10 and / or the lower flange 9. The present disclosure can further effectively protect the crankshaft balance weight through the setting of the isolation cover.

[0078] Embodiment 3:

[0079] Based on the above Embodiment 1 or Embodiment 2, as Figures 7a - 7c shown: A structure of a crankshaft balance weight pump body assembly further includes an isolation cover. The isolation cover is disposed in the exhaust cavity of the lower flange and surrounds the crankshaft balance weight; it is used to isolate the gas between the crankshaft balance weight and the exhaust cavity of the lower flange, thereby realizing double isolation of oil and gas for the crankshaft balance weight, avoiding oil and gas agitation by the crankshaft balance weight during operation, and improving problems such as unstable shaft system and increased power consumption, so as to further improve the stability and reliability of the compressor operation. Figures 7a - 7c The difference lies in the difference in the connection method between the isolation cover and the lower flange (realizing line seal or plane seal, etc.).

[0080] The present disclosure also provides a compressor, which includes the crankshaft balance assembly described in any one of the previous items.

[0081] The above are only the preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present disclosure shall be included within the protection scope of the present disclosure. The above is only the preferred implementation manner of the present disclosure. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present disclosure, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present disclosure.

Claims

1. A crankshaft balance assembly, characterized in that: comprising: a crankshaft (1), a lower flange (9), a crankshaft balance weight (12) and a sealing structure. The crankshaft (1) includes a long shaft (1a), an eccentric shaft (1b) and a short shaft (1c). The lower flange (9) is sleeved on the short shaft (1c) to support the short shaft (1c). The sealing structure is further provided on the short shaft (1c). An exhaust cavity (100) is formed between the sealing structure and the lower flange (9). The crankshaft balance weight (12) is connected to the short shaft (1c) and is located in the exhaust cavity (100); the sealing structure includes a cover plate (10), and the cover plate (10) is fixedly connected to the lower flange (9). The short shaft (1c) can rotate relative to the lower flange (9) and the cover plate (10); the sealing structure further includes a seal (11). The seal (11) is fixedly connected to the axial end of the short shaft (1c). The axial end of the short shaft (1c) penetrates through the cover plate (10) and is fixedly connected to the seal (11). The seal (11) is in sealing connection with the cover plate (10); the crankshaft balance weight (12) includes a central portion (12b) and a convex portion (12c). One end of the convex portion (12c) is connected to the central portion (12b), and the other end extends towards the direction of the seal (11). The convex portion (12c) extends out of the cover plate (10) and is in contact with the seal (11).

2. The crankshaft balance assembly according to claim 1, characterized in that: the seal (11) is an oil pump structure, and the oil pump structure can rotate with the rotation of the short shaft (1c) to pump oil.

3. The crankshaft balance assembly according to claim 1, characterized in that: the crankshaft balance weight (12) further includes an eccentric portion (12a). The central portion (12b) is sleeved on the short shaft (1c), and the center of the central portion (12b) is concentric with the center of the short shaft (1c). The eccentric portion (12a) is connected to the radially outer end of the central portion (12b), and the centroid of the eccentric portion (12a) is eccentric with the center of the short shaft (1c).

4. The crankshaft balance assembly according to claim 3, characterized in that: the central portion (12b) is a cylindrical barrel structure, and the eccentric portion (12a) is a fan-shaped columnar structure.

5. The crankshaft balance assembly according to claim 1, characterized in that: the short shaft (1c) includes a first mating shaft section (1c1), a second mating shaft section (1c2) and a third mating shaft section (1c3) arranged in sequence along its axis. The first mating shaft section (1c1) cooperates with the lower flange (9), the second mating shaft section (1c2) cooperates with the crankshaft balance weight (12), and the outer diameters of the first mating shaft section (1c1), the second mating shaft section (1c2) and the third mating shaft section (1c3) are different from each other.

6. The crankshaft balance assembly according to claim 5, characterized in that: The outer diameter of the first mating shaft section (1c1) is greater than the outer diameter of the second mating shaft section (1c2); and / or, the crankshaft balance weight (12) is press-fitted with the second mating shaft section (1c2), or the crankshaft balance weight (12) is fixedly connected to the second mating shaft section (1c2) through a keyway, or the crankshaft balance weight (12) is integrally formed with the second mating shaft section (1c2).

7. The crankshaft balance assembly according to any one of claims 1-6, wherein: The crankshaft balance weight (12) is connected to the short shaft (1c) by bolts; or the crankshaft balance weight (12) is connected to the short shaft (1c) by riveting or fixedly connected through a keyway, or the crankshaft balance weight (12) is integrally formed with the short shaft (1c).

8. The crankshaft balance assembly according to claim 1, wherein: In the projection plane perpendicular to the axis of the crankshaft (1), the centroid of the crankshaft balance weight (12) and the centroid of the adjacent eccentric shaft (1b) are relatively distributed with a phase difference of 180°; further comprising a rotor balance weight (3), the rotor balance weight (3) is connected to the motor rotor, and the centroid of the crankshaft balance weight (12) and the centroid of the rotor balance weight (3) are relatively distributed with a phase difference of 180°.

9. The crankshaft balance assembly according to claim 1, wherein: The cover plate (10) is further provided with a counterbore (101), the counterbore (101) communicates with the exhaust cavity (100), and at least a part of the crankshaft balance weight (12) is disposed in the counterbore (101) and can rotate in the counterbore (101).

10. The crankshaft balance assembly according to claim 1, wherein: Further comprising an isolation cover (15), the isolation cover (15) is disposed in the exhaust cavity (100), the isolation cover (15) covers the outside of the crankshaft balance weight (12), such that the crankshaft balance weight (12) is located in the cavity surrounded by the isolation cover (15), and the isolation cover (15) is fixedly connected to the cover plate (10) and / or the lower flange (9).

11. A compressor, wherein: Comprising the crankshaft balance assembly according to any one of claims 1-10.

Images