CN216157899U - Crankshaft balance assembly and compressor - Google Patents

Abstract

The utility model provides a crankshaft balance assembly and a compressor, wherein the crankshaft balance assembly comprises: the crankshaft comprises a long shaft, an eccentric shaft and a short shaft, the short shaft is sleeved with the lower flange to support the short shaft, the sealing structure is further arranged on the short shaft, an exhaust cavity is formed between the sealing structure and the lower flange, and the crankshaft balance block is connected with the short shaft and is positioned in the exhaust cavity. According to the utility model, the series of problems of lower cavity lengthening caused by adding a balance cavity independently can be avoided, and the problem of upward movement of the center of gravity of the pump body is solved; the problems of power consumption increase, shaft system instability, poor reliability and the like caused by oil stirring of the crankshaft balance block in operation can be solved, and the problem of oil stirring of the balance block is effectively solved; the shape design of the crankshaft balance block is not limited, and the crankshaft balance block is easy to machine and assemble.

Description

Crankshaft balance assembly and compressor

Technical Field

The utility model relates to the technical field of compressors, in particular to a crankshaft balance assembly and a compressor.

Background

In the conventional vertical rotor compressor, because of the existence of the eccentric part of the crankshaft and the eccentric motion of the roller, the upper end and the lower end of the rotor are mostly respectively provided with a balance block to offset unbalanced force and moment. However, for a large-number-of-rotor compressor, particularly a double-cylinder or multi-cylinder compressor, the cylinder diameter, the cylinder height, the bearing span, the rotor eccentric mass and the rotational inertia arm are large, so that the deflection of a crankshaft is too large when the compressor runs at high frequency, the crankshaft and the bearing are easily engaged and abraded, and the reliability of the compressor is affected. The existing method reduces the weight of a balance block required by the upper end of a motor rotor by adding the balance block at the lower part of a crankshaft, thereby reducing the deformation of an eccentric crankshaft and improving the stability of a shafting and the reliability of a compressor.

The prior patents with patent numbers CN204371682U, CN103527482B and CN203614415U all disclose that an eccentric part and a balance part are arranged on a crankshaft of a single cylinder compressor at intervals along the axial direction, the eccentric part is located in a compression cavity, the balance part is located in a balance cavity defined separately below an air cylinder, and this structure adds a cavity separately for placing a crankshaft balance structure, which results in an overlong lower cavity, a complex structure, shift-up of the center of gravity of a pump body, and further causes unstable operation and aggravation of vibration of the compressor; meanwhile, the balance cavity of the compressor is communicated with the oil pool, so that oil stirring of a crankshaft balance block in operation can be caused, power consumption is increased, a shaft system is unstable, and the reliability of the compressor is further influenced;

patent No. CN103486036B and CN110685911A, its balanced chamber sets up in airtight or the cavity that partly surrounds, can avoid operating bent axle balancing piece to a certain extent to the excessive oil that stirs of oil bath, but also increased a chamber alone simultaneously and placed the bent axle balancing piece, has the cavity of resorption overlength equally, and the pump body focus moves upward to and the compressor that brings moves harmful effects such as unstable, the vibration aggravation.

Because a cavity is required to be independently arranged for placing the crankshaft balance block when the crankshaft balance block is arranged in the compressor in the prior art, the technical problems of overlong lower cavity, upward movement of the gravity center of a pump body, and adverse effects of unstable operation, aggravation of vibration and the like of the compressor are caused, and the crankshaft balance assembly and the compressor are researched and designed.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the utility model is to overcome the defects that when the crankshaft balance block is arranged in the compressor in the prior art, a cavity is required to be independently arranged for placing the crankshaft balance block, so that the lower cavity is too long, the gravity center of a pump body moves upwards, and adverse effects such as unstable operation, aggravation of vibration and the like of the compressor are brought, thereby providing the crankshaft balance assembly and the compressor.

In order to solve the above problems, the present invention provides a crankshaft balancer assembly, comprising:

the crankshaft comprises a long shaft, an eccentric shaft and a short shaft, the short shaft is sleeved with the lower flange to support the short shaft, the sealing structure is further arranged on the short shaft, an exhaust cavity is formed between the sealing structure and the lower flange, and the crankshaft balance block is connected with the short shaft and is positioned in the exhaust cavity.

In some embodiments, the sealing structure includes a cover plate disposed at an axial end of the stub shaft, the cover plate is fixedly connected to the lower flange, and the stub shaft is rotatable relative to the lower flange and the cover plate.

In some embodiments, the sealing structure further comprises a sealing member fixedly connected to an axial end portion of the short shaft, the axial end portion of the short shaft penetrates through the cover plate and is fixedly connected to the sealing member, and the sealing member is in sealing connection with the cover plate.

In some embodiments, the seal is an oil pump structure that is rotatable with rotation of the stub shaft to pump oil.

In some embodiments, the crankshaft balance weight includes an eccentric portion and a central portion, the central portion is disposed on the short shaft, the center of the central portion is concentric with the center of the short shaft, the eccentric portion is connected to the radially outer end of the central portion, and the center of mass of the eccentric portion is eccentric with the center of the short shaft.

In some embodiments, the central portion is a cylindrical barrel structure and the eccentric portion is a sector cylindrical structure.

In some embodiments, when a seal is included:

the crankshaft balance weight further comprises a protruding portion, one end of the protruding portion is connected with the central portion, the other end of the protruding portion extends towards the direction of the sealing element, and the protruding portion extends out of the cover plate and is connected with the sealing element.

In some embodiments, the stub shaft includes a first mating shaft section, a second mating shaft section, and a third mating shaft section sequentially arranged in an axial direction thereof, the first mating shaft section is mated with the lower flange, the second mating shaft section is mated with the crankshaft balance weight, the third mating shaft section is mated with the seal, and the first mating shaft section, the second mating shaft section, and the third mating shaft section are different in outer diameter from each other.

In some embodiments, the first mating shaft segment has an outer diameter that is greater than an outer diameter of the second mating shaft segment; and/or the crankshaft balance block and the second matching shaft section are in interference fit, or the crankshaft balance block and the second matching shaft section are fixedly connected through a key groove, or the crankshaft balance block and the second matching shaft section are integrally formed.

In some embodiments, the crankshaft counterbalance is bolted to the stub shaft; or the crankshaft balance weight and the short shaft are connected in a riveting mode or fixedly connected through a key groove, or the crankshaft balance weight and the short shaft are integrally formed.

In some embodiments, the center of mass of the crankshaft counterbalance is in a relative distribution with a phase difference of 180 ° with the center of mass of the eccentric shaft adjacent to the crankshaft in a projection plane perpendicular to the axis of the crankshaft; still include the rotor balancing piece, the rotor balancing piece is connected and is set up on electric motor rotor, and the barycenter of bent axle balancing piece with the barycenter of rotor balancing piece is the relative distribution who differs 180 looks degrees.

In some embodiments, the cover plate is further provided with a sinking groove, the sinking groove is communicated with the exhaust cavity, and at least a part of the crankshaft balance weight is arranged in the sinking groove and can rotate in the sinking groove.

In some embodiments, the exhaust device further comprises an isolation cover, the isolation cover is arranged in the exhaust cavity, the isolation cover is arranged outside the crankshaft balance weight, so that the crankshaft balance weight is located in a cavity surrounded by the isolation cover, and the isolation cover is fixedly connected to the cover plate and/or the lower flange.

The utility model also provides a compressor comprising the crankshaft balancing assembly of any one of the preceding claims.

The crankshaft balance assembly and the compressor provided by the utility model have the following beneficial effects:

according to the utility model, the exhaust cavity is arranged between the sealing structure and the lower flange, the crankshaft balance block is arranged in the exhaust cavity and is connected with the short shaft of the crankshaft, so that the crankshaft balance block can play a role of balancing the eccentric part of the crankshaft, and a cavity is not required to be independently added for placing the crankshaft balance block, thereby avoiding the series of problems of lower cavity lengthening caused by independently adding a balance cavity, preventing the center of gravity of the lengthened pump body from moving upwards, solving the problem of the center of gravity of the pump body from moving upwards, fully utilizing the space, greatly reducing the size of the pump body in the axial direction, being beneficial to the running stability of the compressor, and further improving the vibration and reliability of the compressor; the crankshaft balance block is arranged in the lower flange exhaust cavity and is matched with the crankshaft short shaft, and a sealing structure is arranged between the crankshaft and the cover plate and is completely isolated from the oil pool, so that the problems of power consumption increase, shaft system instability, poor reliability and the like caused by oil stirring of the crankshaft balance block in operation are solved, and the problem of oil stirring of the balance block is effectively solved; the shape design of the crankshaft balance block is not limited, and the crankshaft balance block is easy to machine and assemble.

Drawings

Fig. 1 is a longitudinal sectional view illustrating a crankshaft balancer assembly according to a first embodiment of the present invention;

FIG. 2a is a top view of the crankshaft counterbalance of FIG. 1;

FIG. 2b is a cross-sectional view A-A of the crankshaft counterbalance of FIG. 2 a;

FIG. 3 is a balance structure diagram of the crankshaft, rotor counterbalance, and crankshaft counterbalance of FIG. 1;

FIG. 4 is a longitudinal sectional view of the cover plate of FIG. 1;

fig. 5 is a longitudinal sectional view of a crankshaft balancer assembly according to a second embodiment of the present invention;

FIG. 6a is a top view of the crankshaft counterbalance of FIG. 5;

FIG. 6B is a cross-sectional view B-B of the crankshaft counterbalance of FIG. 6 a;

FIG. 7a is a longitudinal sectional view of a crankshaft balancer assembly according to a third embodiment of the present invention;

FIG. 7b is a view of the first variant of FIG. 7 a;

fig. 7c shows a second variant of fig. 7 a.

The reference numerals are represented as:

1. a crankshaft; 1a, a long axis; 1b, an eccentric shaft; 1b1, first eccentric shaft; 1b2, second eccentric shaft; 1c, minor axis; 1c1, a first mating shaft segment; 1c2, a second mating shaft segment; 1c3, a third mating shaft segment; 2. a rotor; 3. a rotor counterbalance; 4. an upper flange; 5. a first cylinder; 6. a first separator; 7. a second separator; 8. a second cylinder; 9. a lower flange; 10. a cover plate; 101. sinking a groove; 11. a seal member; 12. a crankshaft counterbalance; 12a, an eccentric portion; 12b, a central portion; 12c, a boss; 13. a second roller; 14. a first roller; 15. an isolation cover; 100. an exhaust chamber; 21. a first eccentric portion; 22. a second eccentric portion.

Detailed Description

In a first embodiment, as shown in fig. 1-4, the present invention provides a crankshaft balancing assembly, comprising:

the crankshaft comprises a crankshaft 1, a lower flange 9, a crankshaft balance weight 12 and a sealing structure, wherein the crankshaft 1 comprises 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 short shaft 1c is also provided with the sealing structure, an exhaust cavity 100 is formed between the sealing structure and the lower flange 9, and the crankshaft balance weight 12 is connected with the short shaft 1c and is positioned in the exhaust cavity 100. The sealing structure isolates the exhaust cavity from the oil sump.

According to the utility model, the exhaust cavity is arranged between the sealing structure and the lower flange, the crankshaft balance block is arranged in the exhaust cavity and is connected with the short shaft of the crankshaft, so that the crankshaft balance block can play a role of balancing the eccentric part of the crankshaft, and a cavity is not required to be independently added for placing the crankshaft balance block, thereby avoiding the series of problems of lower cavity lengthening caused by independently adding a balance cavity, preventing the center of gravity of the lengthened pump body from moving upwards, solving the problem of the center of gravity of the pump body from moving upwards, fully utilizing the space, greatly reducing the size of the pump body in the axial direction, being beneficial to the running stability of the compressor, and further improving the vibration and reliability of the compressor; the crankshaft balance block is arranged in the lower flange exhaust cavity and is matched with the crankshaft short shaft, and a sealing structure is arranged between the crankshaft and the cover plate and is completely isolated from the oil pool, so that the problems of power consumption increase, shaft system instability, poor reliability and the like caused by oil stirring of the crankshaft balance block in operation are solved, and the problem of oil stirring of the balance block is effectively solved; the shape design of the crankshaft balance block is not limited, and the crankshaft balance block is easy to machine and assemble. The utility model provides a crankshaft balance block pump body structure, simple structure is rationally distributed, can not cause the compressor consumption to increase, and the shafting is stable, the reliability is high, the vibration is little.

As shown in fig. 1, the pump body rotor assembly structure of the present application is sequentially provided with a rotor, a rotor balance block, an upper flange, a cylinder, a roller, a sliding vane (not shown), a lower flange, a crankshaft balance block, a cover plate, and a sealing member from top to bottom along the axial direction of a crankshaft;

wherein, the crankshaft comprises a long shaft, an eccentric shaft and a short shaft;

a lower flange supporting the crankshaft stub shaft and having an exhaust cavity;

a sealing structure comprising a cover plate and a sealing element; the upper end face of the cover plate is connected with the lower end face of the lower flange; the lower end face of the cover plate is connected with the sealing element; the sealing structure isolates the exhaust cavity from an oil sump in the compressor shell;

as shown in fig. 2a-2b, a crankshaft balance weight of the present application is connected to the crankshaft short shaft and received in the lower flange exhaust cavity; compared with the prior art in which a balance cavity is independently added, the lower cavity of the pump body is prevented from being lengthened, the space is reasonably utilized, the size of the pump body is greatly reduced in the axial direction, and the stability and the reliability of the shafting are favorably improved.

By combining the sealing structure and the lower flange exhaust cavity, the crankshaft balance block is arranged in the closed cavity completely isolated from the oil pool, so that the problem of oil stirring of the crankshaft balance block in the operation process in the prior art is solved, and the power consumption increase and the shafting instability caused by oil stirring are avoided.

In some embodiments, the sealing structure includes a cover plate 10, the cover plate 10 is sleeved on an axial end of the short shaft 1c, the cover plate 10 is fixedly connected with the lower flange 9, and the short shaft 1c can rotate relative to the lower flange 9 and the cover plate 10. The sealing structure is a preferable structure form of the sealing structure, the cover plate can be fixedly connected with the lower flange and effectively forms a sealed exhaust cavity, so that gas compressed in a cylinder of a pump body of the compressor enters the exhaust cavity, the crankshaft balance block is arranged in the exhaust cavity, oil stirring of the balance block can be prevented, no cavity is added, the phenomenon that the center of gravity of the pump body moves upwards due to the fact that the cavity is added at the lower part of the pump body is avoided, and the structure is more compact. And the cover plate is a supporting structure and is matched with the short shaft of the crankshaft.

Furthermore, the cover plate is of a supporting structure, is in clearance fit with the crankshaft short shaft and is used for supporting the crankshaft short shaft, reducing the bending deformation of the crankshaft, relieving the supporting effect of the upper flange and the lower flange on the crankshaft, reducing the abrasion of the crankshaft and the upper bearing and enhancing and improving the stability of a shafting.

In some embodiments, the sealing structure further includes a sealing member 11, the sealing member 11 is fixedly connected to an axial end portion of the short shaft 1c, the axial end portion of the short shaft 1c penetrates through the cover plate 10 and is fixedly connected to the sealing member 11, and the sealing member 11 is in sealing connection with the cover plate 10. The utility model also can seal the joint of the cover plate and the axial end part of the short shaft through the sealing element.

In some embodiments, the seal 11 is an oil pump structure that is rotatable with rotation of the stub shaft 1c to pump oil. This is the preferred form of construction for the seal of the utility model, which is sealed by the oil pump structure and also lubricated by rotating to pump the oil from the bottom up to the location of the moving friction pair. The preferred gear oil pump structure of sealing member has pump oil and one-way sealing effect concurrently.

Preferably, the sealing element can be a gear oil pump structure, and has the functions of pumping oil and sealing in a one-way mode through rotating along with a crankshaft; the gear oil pump has large oil supply amount, and oil films are easily formed in gaps between parts of the pump body and the bearing, so that abrasion is not easily generated.

In some embodiments, the crankshaft balance weight 12 includes an eccentric portion 12a and a central portion 12b, the central portion 12b is sleeved on the stub shaft 1c, the center of the central portion 12b is concentric with the center of the stub shaft 1c, the eccentric portion 12a is connected to the radially outer end of the central portion 12b, and the center of mass of the eccentric portion 12a is eccentric with the center of the stub shaft 1 c. This is a preferred configuration of the crankshaft counterbalance of the present invention, and the central portion can be effectively fixed to the short shaft of the crankshaft, while the eccentric portion can perform the eccentric function, thereby generating the balance function of the dynamic eccentric mass and the eccentric moment.

In some embodiments, the central portion 12b is a cylindrical structure and the eccentric portion 12a is a fan-shaped cylindrical structure. The central part of the utility model is preferably a cylindrical barrel which can be firmly sleeved on the short shaft, and the eccentric part of the fan-shaped cylindrical structure can play the role of eccentric balance mass and moment.

Example two:

in some embodiments, when the seal 11 is included:

the crankshaft balance weight 12 further includes a protruding portion 12c, one end of the protruding portion 12c is connected to the central portion 12b, the other end extends toward the sealing member 11, and the protruding portion 12c protrudes out of the cover plate 10 and is connected to the sealing member 11. Preferably, the seal is sleeved on the boss. The second embodiment of the utility model is a preferable structure, and the protruding portion can penetrate out of the cover plate and be inserted into the sealing element, so that the sealing effect can be further effectively improved.

In contrast to the first embodiment, as shown in fig. 5 to 6 b: a crankshaft counterweight structure, the crankshaft counterweight has an eccentric portion, a central portion, and a raised portion; the axis of the central part is collinear with the rotation central line of the crankshaft and is connected with the short shaft of the crankshaft; the bulge part is connected with the sealing element; the eccentric portion center of mass is eccentrically disposed with respect to the crankshaft rotation center;

specifically, the crankshaft balance block is connected with the crankshaft short shaft through a bolt; the lower ends of the crankshaft balance block and the crankshaft short shaft are provided with threaded holes.

Optionally, the crankshaft balance weight and the crankshaft short shaft can be connected in a riveting mode;

optionally, the crankshaft balance weight is fixedly connected with the crankshaft short shaft through a key slot;

optionally, the crankshaft balance weight and the short shaft are integrally formed by casting or numerical milling;

the crankshaft balance block structure of the embodiment can further simplify the structure of the pump body, and is easy for processing parts of the pump body and installing and positioning the crankshaft balance block.

In some embodiments, the stub shaft 1c includes a first mating shaft section 1c1, a second mating shaft section 1c2, and a third mating shaft section 1c3 arranged in this order along an axial direction thereof, the first mating shaft section 1c1 is mated with the lower flange 9, the second mating shaft section 1c2 is mated with the crankshaft balance weight 12, the third mating shaft section 1c3 is mated with the seal 11, and the first mating shaft section 1c1, the second mating shaft section 1c2, and the third mating shaft section 1c3 all have different outer diameters from one another. The stub shaft of the present invention preferably includes three mating shaft segments that respectively cooperate with the lower flange, crankshaft counterbalance, and seal.

In some embodiments, the outer diameter of the first mating shaft segment 1c1 is greater than the outer diameter of the second mating shaft segment 1c 2; and/or the crankshaft balance weight 12 and the second matching shaft section 1c2 are in interference fit, or the crankshaft balance weight 12 and the second matching shaft section 1c2 are fixedly connected through a key slot, or the crankshaft balance weight 12 and the second matching shaft section 1c2 are integrally formed. The inner diameter of the lower flange is larger than that of the crankshaft balance block, so that the outer diameter of the first matching shaft section is larger than that of the second matching shaft section; and preferably the crankshaft counterbalance may be interference fit, keyway fit or integrally formed with the second mating shaft section such that the crankshaft counterbalance is fixedly secured to the second mating shaft section of the stub shaft.

Further, as shown in fig. 1 and 3, the crankshaft short shaft is provided with matching shaft sections with different outer diameters in sequence downwards along the axis direction of the crankshaft; the cooperation shaft section including: a first mating shaft section that mates with the lower flange; the second matching shaft section is matched with the crankshaft balance block; a third mating shaft segment that mates with the seal;

the outer diameter of the first matching shaft section is larger than that of the second matching shaft section; the first matching shaft section of the crankshaft can be utilized to axially limit the crankshaft balance block by the arrangement.

Meanwhile, the crankshaft balance block and the first matching shaft section are assembled together in an interference fit mode and are installed by means of cold pressing or hot sleeving; optionally, the crankshaft balance weight and the first mating shaft section are fixedly connected through a key slot; optionally, the crankshaft counterbalance is integrally formed with the first mating shaft section.

In some embodiments, the crankshaft counterbalance 12 is bolted to the stub shaft 1 c; or the crankshaft balance weight 12 and the short shaft 1c are connected in a riveting mode or fixedly connected through a key groove, or the crankshaft balance weight 12 and the short shaft 1c are integrally formed. The crankshaft balance block can be fixedly assembled on the short shaft through screwing, riveting, key grooves or integrated forming.

Furthermore, the interference magnitude of the interference fit between the crankshaft balance block and the crankshaft short shaft is (0.02-0.04) mm, so that the problem that the crankshaft balance block is loosened or displaced due to vibration caused by high-speed operation can be solved, and adverse effects such as deformation and displacement of a pump body caused by excessive interference magnitude, difficult assembly and assembly can be prevented.

In some embodiments, the center of mass of the crankshaft balance mass 12 and the center of mass of the eccentric shaft 1b adjacent thereto are in a relative distribution with a phase difference of 180 ° in a projection plane perpendicular to the axis of the crankshaft 1; still include rotor balancing piece 3, rotor balancing piece 3 connects and sets up on electric motor rotor, and the barycenter of bent axle balancing piece 12 with rotor balancing piece 3's barycenter is the relative distribution that differs 180 looks degrees. The difference between the mass center of the crankshaft balance block and the mass center of the eccentric shaft by 180 degrees can play a role in effective mass and moment balance on the eccentric part of the crankshaft; the difference of the mass center of the crankshaft balance block and the mass center of the rotor balance block by 180 degrees can play a role in effective mass and moment balance for the eccentric part of the crankshaft, effectively reduce the weight of the rotor balance block, enable the whole balance system to move downwards, and ensure the balance of a shaft system and simultaneously minimize the deflection at the top of the crankshaft.

As shown in fig. 3, the crankshaft counterbalance is eccentrically disposed with respect to the center of rotation of the crankshaft; the center of mass of the crankshaft balance block and the center of mass of the crankshaft eccentric shaft adjacent to the center of mass of the crankshaft balance block are distributed in a phase opposite distribution of 180 degrees; preferably, the rotor balance block is arranged at the lower end of the rotor close to the pump body side, and is opposite to the center of mass of the crankshaft balance block by 180 degrees of phase difference; the application discloses bent axle balancing piece pump body structure satisfies:

M1*R1+M3*R3＝M2*R2+M4*R4

M1*R1*L1+M2*R2*L2+M3*R3*L3＝M4*R4*L4

as described above: the moment of the rotor balancing block, the moment of the crankshaft balancing block and the moment of the adjacent eccentric part (the second eccentric part 22 in the figure) of the crankshaft balancing block balance the moment far away from the eccentric part (the first eccentric part 21 in the figure) of the crankshaft balancing block together, so the arrangement can effectively reduce the weight of the rotor balancing block, and the whole balancing system moves down.

In some embodiments, the cover plate 10 is further provided with a sinking groove 101, the sinking groove 101 is communicated with the exhaust cavity 100, and at least a part of the crankshaft balance weight 12 is disposed in the sinking groove 101 and can rotate in the sinking groove 101. The utility model can effectively accommodate the crankshaft balance block in the sink groove and rotate, thereby effectively limiting the position of the crankshaft balance block. The cover plate comprises a sinking groove, and the sinking groove is communicated with the exhaust cavity. The crankshaft balance block is avoided, so that the lower cavity is distributed, and the pump body is simple to assemble and easy to implement.

In the third embodiment, as shown in fig. 7a to 7c, in some embodiments, the exhaust chamber 100 further includes a shielding cover 15, the shielding cover 15 is disposed in the exhaust chamber 100, the shielding cover 15 covers the outside of the crankshaft balance weight 12, so that the crankshaft balance weight 12 is located in the chamber surrounded by the shielding cover 15, and the shielding cover 15 is fixedly connected to the cover plate 10 and/or the lower flange 9. The crankshaft balance block can be further effectively protected by the arrangement of the isolation cover.

Example three:

on the basis of the first or second embodiment, as shown in fig. 7a-7 c: the crankshaft balance block pump body assembly structure further comprises an isolation cover, wherein the isolation cover is arranged in the lower flange exhaust cavity and surrounds the crankshaft balance block; the crankshaft balance block is isolated from the gas in the lower flange exhaust cavity, so that oil and gas dual isolation of the crankshaft balance block is realized, oil stirring and gas stirring of the crankshaft balance block in the operation process are avoided, the problems of unstable shafting, power consumption increase and the like are solved, and the stability and the reliability of the operation of the compressor can be further improved. The difference between fig. 7a-7c is the difference in the way of connection between the cage and the lower flange (whether a line or plane seal is achieved, etc.).

The utility model also provides a compressor comprising the crankshaft balancing assembly of any one of the preceding claims.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (14)

1. A crankshaft balance assembly, its characterized in that: the method comprises the following steps:

the crankshaft (1) comprises 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 short shaft (1c) is further provided with the sealing structure, an exhaust cavity (100) is formed between the sealing structure and the lower flange (9), and the crankshaft balance block (12) is connected with the short shaft (1c) and located in the exhaust cavity (100).

2. The crankshaft balancing assembly of claim 1, wherein:

the sealing structure comprises a cover plate (10), the cover plate (10) is sleeved at the axial end part of the short shaft (1c), the cover plate (10) is fixedly connected with the lower flange (9), and the short shaft (1c) can rotate relative to the lower flange (9) and the cover plate (10).

3. The crankshaft balancing assembly of claim 2, wherein:

the sealing structure further comprises a sealing element (11), the sealing element (11) is fixedly connected with the axial end part of the short shaft (1c), the axial end part of the short shaft (1c) penetrates through the cover plate (10) and is fixedly connected with the sealing element (11), and the sealing element (11) is connected with the cover plate (10) in a sealing mode.

4. The crankshaft balancing assembly of claim 3, wherein:

the sealing member (11) is of an oil pump structure which can rotate along with the rotation of the short shaft (1c) to pump oil.

5. The crankshaft balancing assembly of any one of claims 1 to 4, wherein:

the crankshaft balance block (12) comprises an eccentric portion (12a) and a central portion (12b), the central portion (12b) is sleeved on the short shaft (1c), the center of the central portion (12b) is concentric with the center of the short shaft (1c), the eccentric portion (12a) is connected and arranged at the radial outer end of the central portion (12b), and the center of mass of the eccentric portion (12a) is eccentric with the center of the short shaft (1 c).

6. The crankshaft balancing assembly of claim 5, wherein:

the central part (12b) is of a cylindrical barrel structure, and the eccentric part (12a) is of a fan-shaped cylindrical structure.

7. The crankshaft balancing assembly of claim 5, wherein:

when including seal (11) and apron (10):

the crankshaft balance weight (12) further comprises a protruding part (12c), one end of the protruding part (12c) is connected with the central part (12b), the other end of the protruding part extends towards the direction of the sealing element (11), and the protruding part (12c) extends out of the cover plate (10) and is connected with the sealing element (11).

8. The crankshaft balancing assembly of claim 3, wherein:

the short shaft (1c) comprises a first matching shaft section (1c1), a second matching shaft section (1c2) and a third matching shaft section (1c3) which are sequentially arranged along the axial direction of the short shaft, the first matching shaft section (1c1) is matched with the lower flange (9), the second matching shaft section (1c2) is matched with the crankshaft balance block (12), the third matching shaft section (1c3) is matched with the sealing element (11), and the first matching shaft section (1c1), the second matching shaft section (1c2) and the third matching shaft section (1c3) are different in outer diameter from one another.

9. The crankshaft balancing assembly of claim 8, wherein:

the first mating shaft segment (1c1) has an outer diameter greater than the outer diameter of the second mating shaft segment (1c 2); and/or the crankshaft balance weight (12) and the second matching shaft section (1c2) are in interference fit, or the crankshaft balance weight (12) and the second matching shaft section (1c2) are fixedly connected through a key slot, or the crankshaft balance weight (12) and the second matching shaft section (1c2) are integrally formed.

10. The crankshaft balancing assembly of claim 1, wherein:

the crankshaft balance block (12) is connected with the short shaft (1c) through a bolt; or the crankshaft balance weight (12) and the short shaft (1c) are connected in a riveting mode or fixedly connected through a key groove, or the crankshaft balance weight (12) and the short shaft (1c) are integrally formed.

11. The crankshaft balancing assembly of claim 1, wherein:

in a projection plane perpendicular to the axis of the crankshaft (1), the mass center of the crankshaft balance block (12) and the mass center of the eccentric shaft (1b) adjacent to the mass center of the crankshaft balance block are in relative distribution with a phase difference of 180 degrees; the motor rotor balance block structure is characterized by further comprising a rotor balance block (3), wherein the rotor balance block (3) is connected and arranged on the motor rotor, and the mass center of the crankshaft balance block (12) and the mass center of the rotor balance block (3) are distributed in a phase-difference mode of 180 degrees in a relative mode.

12. The crankshaft balancing assembly of claim 2, wherein:

the cover plate (10) is further provided with a sinking groove (101), the sinking groove (101) is communicated with the exhaust cavity (100), and at least part of the crankshaft balance block (12) is arranged in the sinking groove (101) and can rotate in the sinking groove (101).

13. The crankshaft balancing assembly of claim 2, wherein:

the exhaust cavity structure is characterized by further comprising a shielding case (15), the shielding case (15) is arranged in the exhaust cavity (100), the shielding case (15) is covered outside the crankshaft balance block (12), the crankshaft balance block (12) is located in a cavity defined by the shielding case (15), and the shielding case (15) is fixedly connected to the cover plate (10) and/or the lower flange (9).

14. A compressor, characterized by: comprising a crankshaft balancing assembly according to any of the claims 1-13.

Images