CN113982937A - Eccentric shaft assembly, scroll compressor and air conditioner - Google Patents

Abstract

The invention provides an eccentric shaft assembly, a scroll compressor and an air conditioner, wherein the eccentric shaft assembly comprises a driving main shaft and an eccentric shaft eccentrically arranged at one end of the driving main shaft, the eccentric shaft is provided with an eccentric part and an eccentric sleeve, the eccentric sleeve is provided with a rotation angle limiting structure, when the eccentric shaft is driven to rotate, the eccentric part and the rotation angle limiting structure are matched to form a first rotation angle limiting position and a second rotation angle limiting position, the first rotation direction and the second rotation direction are opposite, and the first rotation direction and the second rotation direction are opposite. According to the invention, the circumferential rotation limit of the segregation shaft sleeve is realized only by utilizing the internal structure of the assembly, the requirement of matching and reforming adjacent parts is not needed, and the structural size of the assembly is more compact while the shaft system length of the eccentric shaft assembly is reduced.

Description

Eccentric shaft assembly, scroll compressor and air conditioner

Technical Field

The invention belongs to the technical field of compressor manufacturing, and particularly relates to an eccentric shaft assembly, a scroll compressor and an air conditioner.

Background

As shown in fig. 1 and 2, the related art discloses an eccentric shaft assembly, which includes a driving main shaft a9 and an eccentric shaft a17 eccentrically disposed with respect to the driving main shaft a9, an eccentric sleeve a18 is fitted around the outer circumference of the eccentric shaft a17, in order to limit the circumferential rotation angle of the eccentric sleeve a18 around the eccentric shaft a17, a limiting part protruding the end surface of the eccentric sleeve a18 towards the end of the driving main shaft a9 is arranged in the prior art, and the limit of the circumferential rotation angle is realized through the matching relation of the limit part and an adjacent part, such as an upper bracket a7, in this way, because the limit part protrudes out of one side of the shaft end of the eccentric sleeve a18, thereby increasing the axial length of the eccentric shaft assembly, namely increasing the shafting length of the compressor, this will undoubtedly increase the weight, cost and even operational vibration noise of the compressor.

Disclosure of Invention

Therefore, the invention provides an eccentric shaft assembly, a scroll compressor and an air conditioner, which can overcome the defect that the length of a shaft system is larger due to the fact that the circumferential rotation angle of an eccentric sleeve needs to be limited in the eccentric shaft assembly in the related art.

In order to solve the above problems, the present invention provides an eccentric shaft assembly, including a driving main shaft and an eccentric shaft eccentrically located at one end of the driving main shaft, wherein the eccentric shaft has an eccentric portion, and further includes an eccentric sleeve, the eccentric sleeve has a rotation angle limiting structure, when the eccentric shaft is driven to rotate, the eccentric portion and the rotation angle limiting structure cooperate to form a first rotation angle limiting position for the eccentric sleeve in a first rotation direction and a second rotation angle limiting position in a second rotation direction, and the first rotation direction is opposite to the second rotation direction.

In some embodiments, any plane perpendicular to the axis of the driving spindle is a first projection plane, the projection of the eccentric portion is a first circle in projection on the first projection plane, the projection of the rotation angle limiting structure includes a first circular arc, a center of the first circular arc does not coincide with a center of the first circle, the first rotation angle limiting position includes a first end point of the first circular arc, and the second rotation angle limiting position includes a second end point of the first circular arc.

In some embodiments, the projection of the rotation angle limiting structure further includes a second circular arc, a center of the second circular arc does not coincide with a center of the first circular arc, the first rotation angle limiting position further includes a third end point of the second circular arc, the third end point is disposed corresponding to the first end point, the second rotation angle limiting position further includes a fourth end point of the second circular arc, and the fourth end point is disposed corresponding to the second end point.

In some embodiments, the eccentric portion has a first protruding shaft section and a second protruding shaft section at two axial ends thereof, wherein the first protruding shaft section is connected to the driving spindle, the eccentric sleeve has a sleeve and a counterweight portion connected to the sleeve through a connecting portion, the sleeve is sleeved on the second protruding shaft section, and the first arc and/or the second arc are located within a projection range of the sleeve on the first projection plane.

In some embodiments, the rotation angle limiting structure is located on a side of the connecting portion facing the drive spindle.

In some embodiments, any plane perpendicular to the axis of the driving main shaft is a first projection plane, a projection of the eccentric portion on the first projection plane is a first circle, a projection of the rotation angle limiting structure includes a third circular arc and a fourth circular arc which intersect, the first rotation angle limiting position includes a first point tangent to the first circle, and the second rotation angle limiting position includes a second point tangent to the first circle, wherein the first point is on the third circular arc, and the second point is on the fourth circular arc.

In some embodiments, any plane perpendicular to the axis of the driving spindle is a first projection plane, a projection of the eccentric portion on the first projection plane is a first sector, a projection of the rotation angle limiting structure includes a first limiting edge corresponding to a first radial edge of the first sector and a second limiting edge corresponding to a second radial edge of the first sector, the first rotation angle limiting position includes the first limiting edge, and the second rotation angle limiting position includes the second limiting edge.

In some embodiments, a contact portion of the eccentric portion and the rotation angle limiting structure is provided with a vibration damping and sound absorbing material; and/or the eccentric part and the eccentric shaft are integrally formed; or the eccentric part and the eccentric shaft are detachably connected.

The invention also provides a scroll compressor which comprises the eccentric shaft assembly.

The invention also provides an air conditioner which comprises the scroll compressor.

According to the eccentric shaft assembly, the scroll compressor and the air conditioner, the rotation angle of the eccentric sleeve is limited through the matching position of the eccentric part of the eccentric shaft and the eccentric sleeve, namely the circumferential rotation limit of the segregation shaft sleeve is realized only by using the internal structure of the assembly, the requirement on the matching transformation of adjacent components is not needed, the structural size of the assembly is more compact while the shaft system length of the eccentric shaft assembly is reduced, the distance between the dynamic disc support bearing and the driving main bearing is shortened after the eccentric shaft assembly is applied to the compressor, the vibration noise and the length and weight of the compressor are reduced, and the eccentric shaft assembly, the scroll compressor and the air conditioner are very suitable for the design trend of light weight and compactness of the compressor for the electric vehicle.

Drawings

FIG. 1 is a schematic view of the internal structure of a scroll compressor of the related art;

FIG. 2 is a schematic view of the assembled structure of FIG. 1 at the eccentric shaft assembly location;

FIG. 3 is a schematic view of an eccentric shaft assembly according to an embodiment of the present invention;

FIG. 4 is a schematic view of the assembled structure of the eccentric shaft assembly of FIG. 2 and other components of the compressor;

FIG. 5 is an embodiment of the eccentric shaft of FIG. 1;

FIG. 6 is another embodiment of the eccentric shaft of FIG. 1;

FIG. 7 is an embodiment of the eccentric sleeve of FIG. 1;

FIG. 8 is a schematic view of the circumferential rotational spacing between the eccentric sleeve and the eccentric shaft of FIG. 7;

FIG. 9 is another embodiment of the eccentric sleeve of FIG. 1;

FIG. 10 is a schematic view of the circumferential rotational spacing between the eccentric sleeve and the eccentric shaft of FIG. 9;

FIG. 11 is yet another embodiment of the eccentric sleeve of FIG. 1;

FIG. 12 is a schematic view of the circumferential rotational spacing between the eccentric sleeve and the eccentric shaft of FIG. 11;

FIG. 13 is yet another embodiment of the eccentric sleeve of FIG. 1;

fig. 14 is a schematic view of circumferential rotation limitation between the eccentric sleeve and the eccentric shaft in fig. 13.

The reference numerals are represented as:

1. driving the main shaft; 2. an eccentric shaft; 21. an eccentric portion; 22. a first protruding shaft section; 23. a second projecting shaft section; 3. an eccentric sleeve; 31. a rotation angle limiting structure; 311. a first endpoint; 312. a second endpoint; 313. a third endpoint; 314. a fourth endpoint; 315. a first point; 316. a second point; 317. a first limit edge; 318. a second limit edge; 32. a sleeve; 33. a connecting portion; 34. a counterweight portion; a1, an upper cover; a2, an O-shaped sealing ring; a4, a fixed scroll; a5, moving the scroll; a6, an annular sealing ring; a7, an upper bracket; a8, a shell; a9, driving a main shaft; a10, a rotor; a11, a stator; a12, a secondary bearing; a13, a secondary balance weight; a14, a main balance weight; a15, sealing the shaft seal; a16, a main bearing; a17, an eccentric shaft; a18, an eccentric sleeve; a19, and driving the bearing by the movable disc.

Detailed Description

Referring to fig. 1 and 2, a related art scroll compressor includes an upper cover a1, an O-ring seal a2, a fixed scroll a4, a moving scroll a5, a ring seal a6, an upper bracket a7, a casing a8, a driving main shaft a9, a rotor a10, a stator a11, a secondary bearing a12, a secondary balance a13, a main balance a14, a seal shaft seal a15, a main bearing a16, an eccentric shaft a17, an eccentric sleeve a18, and a moving disk driving bearing a19, wherein a stator a11 and a rotor a10 constituting a driving motor are built in the casing a8, the driving motor drives the main shaft a9 to rotate, a crankshaft is circumferentially and radially constrained by the secondary bearing a12 and the main bearing a16 to ensure coaxiality of a shaft system, and a driving end of the crankshaft drives the moving scroll a5 to orbit around the fixed scroll a4 by supporting the eccentric sleeve a18 by the eccentric shaft a 17. The volume of a compression chamber formed by the fixed scroll a4 and the movable scroll a5 in the machine shell a8 is periodically increased and decreased to form a compression chamber for compressing refrigerant, thereby completing the continuous compression of the refrigerant sucked into the compression chamber. The eccentric shaft assembly comprises a driving main shaft a9, an eccentric shaft a17 and an eccentric sleeve a18, and particularly comprises the driving main shaft a9 and the eccentric shaft a17 eccentrically arranged on the main shaft, the eccentric shaft a17 is axially arranged in a corresponding main shaft pin hole from the main shaft close to the side end face of the movable disc, the eccentric sleeve a18 is nested between the main shaft and the movable disc, the eccentric sleeve can contain the eccentric shaft in the axial direction, the external part of the eccentric shaft can support the movable disc driving bearing a19, and the eccentric sleeve can freely rotate between every two parts. The eccentric sleeve is accommodated in the accommodating space of the upper support, and the movable disc driving bearing is arranged in the movable disc bearing accommodating hole. So set up, when the main shaft is rotatory around self axis eccentric drive eccentric shaft a17 is rotatory, eccentric shaft drive eccentric cover, eccentric cover support driving disk drive bearing final drive move the coil and revolve around bent axle center certain distance, final drive motor drive moves the vortex and coils the motion of quiet vortex dish according to restraint design distance, realizes moving and forms periodic variation's compression chamber between the quiet dish, accomplishes breathing in, compress and exhaust to the refrigerant. Simultaneously, because eccentric cover can be rotatory around the eccentric shaft, the eccentric cover axial region that drives driving disk drive bearing promptly can be around eccentric shaft circumference rotation, and driving disk center promptly can be around the eccentric shaft rotation, and along with the rotation of driving disk around the eccentric shaft, final driving disk and quiet dish central distance can change in certain extent, realize the contact force between dynamic vortex dish tooth wall and the quiet vortex dish tooth wall under the special operating mode, improve compressor reliability and performance. In order to prevent the compressor from being unstable in operation or interfering with the support accommodating cavity due to the fact that the axial rotation angle of the eccentric sleeve around the eccentric shaft is large under the conditions of starting, aligning, abnormal shutdown and the like, the circumferential rotation angle of the eccentric sleeve around the eccentric shaft needs to be limited. There are deficiencies, as mentioned in the background, upon which improvements to eccentric shaft assemblies are based.

Referring to fig. 3 to 14 in combination, according to an embodiment of the present invention, there is provided an eccentric shaft assembly, including a driving main shaft 1 and an eccentric shaft 2 eccentrically disposed at one end of the driving main shaft 1, where the eccentric shaft 2 has an eccentric portion 21, and further including an eccentric sleeve 3, the eccentric sleeve 3 has a rotation angle limiting structure 31, and when the eccentric shaft 2 is driven to rotate, the eccentric portion 21 and the rotation angle limiting structure 31 cooperate to form a first rotation angle limiting position in a first rotation direction and a second rotation angle limiting position in a second rotation direction for the eccentric sleeve 3, and the first rotation direction is opposite to the second rotation direction. In the technical scheme, the eccentric part 21 of the eccentric shaft 2 and the eccentric sleeve 3 are matched to limit the rotation angle of the eccentric sleeve 3, namely, the circumferential rotation limit of the eccentric sleeve 3 is realized only by using the internal structure of the assembly, the requirement for matching transformation of adjacent parts is not needed, the length of a shaft system of the eccentric shaft assembly is reduced, the structural size of the assembly is more compact, the distance between the dynamic disc support bearing and the driving main bearing is shortened when the assembly is applied to a compressor, the vibration noise and the length and weight of the compressor are reduced, and the assembly is very suitable for the design trend of light weight and compactness of the compressor for the electric vehicle. In addition, in some cases, the axial dimension of the rotation angle limiting structure 31 can be designed to be increased, so that the problem of reliability of fracture failure caused by low structural strength of the rotation angle limiting structure 31 and the eccentric part 21 when the compressor is stopped at a high speed and is frequently started and stopped is solved, and the reliability of the compressor is improved.

Referring to fig. 7 and 8 in combination, in some embodiments, any plane perpendicular to the axis of the driving spindle 1 is a first projection plane, a projection of the eccentric portion 21 on the first projection plane is a first circle, a projection of the rotation angle limiting structure 31 includes a first circular arc, a center of the first circular arc does not coincide with a center of the first circle, the first rotation angle limiting position includes a first end point 311 of the first circular arc, and the second rotation angle limiting position includes a second end point 312 of the first circular arc, that is, in this technical solution, the first end point 311 and the second end point 312 achieve limitation on circumferential rotation of the eccentric sleeve 3 through different contact points of the first circular arc and the first circular arc that are not concentric, that is, the first end point 311 and the second end point 312, which are actually understood, the first end point 311 and the second end point 312 are formed by projections, which in practice correspond to two contact lines, respectively, extending in the axial direction of the drive spindle 1. It should be noted that the specific positions of the first end point 311 and the second end point 312 are related to the diameter of the eccentric portion 21, the diameter of the arc section where the rotation angle limiting structure 31 is matched with the eccentric portion 21, the eccentricity of the two, and other dimensions, which are conventional for those skilled in the art, and the present invention is not described in detail herein, but it is clear that no matter what manner is adopted, the eccentric portion 21 should only contact between the first rotation angle limiting position and the rotation angle limiting structure 31, and no contact point should exist in the rotation process between the two, and this principle goes through all embodiments of the present invention and is not described in detail herein.

With continued reference to fig. 9 and 10, in some embodiments, the projection of the rotation angle limiting structure 31 further includes a second circular arc, a center of the second circular arc does not coincide with a center of the first circle, the first rotation angle limiting position further includes a third end point 313 of the second circular arc, the third end point 313 is disposed corresponding to the first end point 311, the second rotation angle limiting position further includes a fourth end point 314 of the second circular arc, and the fourth end point 314 is disposed corresponding to the second end point 312. In this technical solution, the first end point 311 and the third end point 313 jointly define the position of the eccentric sleeve 3 at the first rotation angle limit position, and the second end point 312 and the fourth end point 314 jointly define the position of the eccentric sleeve 3 at the second rotation angle limit position, so that simultaneous multi-point (multi-line) limiting can be formed, the impact force of limiting contact is balanced, the stability of contact limiting is increased, the strength and contact noise of the limiting position are reduced, the disadvantages such as wear and the like caused by contact can be effectively reduced, and the service life of parts is prolonged.

The axial two ends of the eccentric portion 21 are respectively provided with a first extending shaft section 22 and a second extending shaft section 23, wherein the first extending shaft section 22 is connected with the driving spindle 1, the eccentric sleeve 3 is provided with a sleeve 32 and a counterweight portion 34 connected with the sleeve 32 through a connecting portion 33, the sleeve 32 is sleeved on the second extending shaft section 23, and the first arc and/or the second arc are/is located in a projection range of the sleeve 32 on the first projection plane, so that the slotted position of the rotation angle limiting structure 31 is more distant from the sleeve 32, and the longer cantilever structure arm length caused by the longer distance is effectively prevented, and the structural strength of the eccentric sleeve 3 is further influenced.

The rotation angle limiting structure 31 is located on a side of the connecting portion 33 facing the driving spindle 1, so that the connecting portion 33 can form an axial reliable limit under the clamping of the upper bracket and the eccentric portion 21 adjacent thereto.

Referring to fig. 11 and 12, in some embodiments, any plane perpendicular to the axis of the driving spindle 1 is a first projection plane, a projection of the eccentric portion 21 on the first projection plane is a first circle, a projection of the rotation angle limiting structure 31 includes a third circular arc and a fourth circular arc that intersect, the first rotation angle limiting position includes a first point 315 that is tangent to the first circle, the second rotation angle limiting position includes a second point 316 that is tangent to the first circle, wherein the first point 315 is on the third circular arc, the second point 316 is on the fourth circular arc, and in a specific embodiment, the third circular arc and the fourth circular arc may be configured as an elliptical hole, and the first point 315 and the second point 316 are tangent to the first circle, which can effectively prevent the eccentric sleeve 3 from being stuck at the first rotation angle limiting position and the second rotation angle limiting position, and the matched components are protected.

Referring to fig. 13 and 14, in some embodiments, any plane perpendicular to the axis of the driving spindle 1 is a first projection plane, a projection of the eccentric portion 21 on the first projection plane is a first sector, a projection of the rotation angle limiting structure 31 includes a first limiting edge 317 corresponding to a first radial edge of the first sector and a second limiting edge 318 corresponding to a second radial edge of the first sector, the first rotation angle limiting position includes the first limiting edge 317, the second rotation angle limiting position includes the second limiting edge 318, which is different from the above-mentioned technical solutions in that the first radial edge and the second radial edge are virtually a plane, and the first limiting edge 317 and the second limiting edge 318 corresponding to the first radial edge and the second radial edge form a plane, the line contact limiting is improved into plane limiting in the technical scheme, impact force is balanced when the circumferential limiting is carried out, and the device has the advantages of small limiting stress, small noise, stability in limiting and timely separation of limiting.

In some embodiments, the contact portion of the eccentric portion 21 and the rotation angle limiting structure 31 has a vibration damping and sound absorbing material, and it can be understood that, in some cases, the eccentric portion 21 may be made of the aforementioned vibration damping and sound absorbing material, specifically, the corresponding portion is wrapped with engineering plastics, so that impact during limiting can be buffered and damped.

In some embodiments, the eccentric portion 21 may be integrally formed with the eccentric shaft 2, so that the assembly process can be reduced and the production efficiency can be improved; or, eccentric portion 21 with can dismantle the connection between the eccentric shaft 2, at this moment, eccentric portion 21 can adopt the preparation of aforementioned damping sound absorbing material to form, compares with the technical scheme that sets up damping sound absorbing material at the driving spindle terminal surface among the correlation technique, the size of eccentric portion 21 can be set up littleer, and then reduces damping sound absorbing material's materials, effectively reduces parts production and processing and shock-absorbing material use cost.

According to an embodiment of the invention, a scroll compressor is also provided, which comprises the eccentric shaft assembly.

According to an embodiment of the invention, an air conditioner is also provided, which comprises the scroll compressor.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (10)

1. An eccentric shaft assembly is characterized by comprising a driving main shaft (1) and an eccentric shaft (2) eccentrically arranged at one end of the driving main shaft (1), wherein the eccentric shaft (2) is provided with an eccentric part (21), the eccentric shaft assembly further comprises an eccentric sleeve (3), the eccentric sleeve (3) is provided with a rotation angle limiting structure (31), when the eccentric shaft (2) is driven to rotate, the eccentric part (21) and the rotation angle limiting structure (31) are matched to form a first rotation angle limiting position of the eccentric sleeve (3) in a first rotation direction and a second rotation angle limiting position of the eccentric sleeve in a second rotation direction, and the first rotation direction is opposite to the second rotation direction.

2. The eccentric shaft assembly according to claim 1, characterized in that any plane perpendicular to the axis of the driving spindle (1) is a first projection plane, on the projection of which the projection of the eccentric (21) is a first circle, the projection of the rotational angle limiting structure (31) comprises a first circular arc, the center of which does not coincide with the center of the first circle, the first rotational angle limiting location comprises a first end point (311) of the first circular arc, and the second rotational angle limiting location comprises a second end point (312) of the first circular arc.

3. The eccentric shaft assembly according to claim 2, characterized in that the projection of the rotation angle limiting structure (31) further comprises a second circular arc, the center of the second circular arc does not coincide with the center of the first circle, the first rotation angle limiting structure further comprises a third end point (313) of the second circular arc, the third end point (313) is arranged corresponding to the first end point (311), the second rotation angle limiting structure further comprises a fourth end point (314) of the second circular arc, and the fourth end point (314) is arranged corresponding to the second end point (312).

4. The eccentric shaft assembly according to claim 3, characterized in that the eccentric portion (21) has a first protruding shaft section (22) and a second protruding shaft section (23) at its two axial ends, wherein the first protruding shaft section (22) is connected to the drive spindle (1), the eccentric sleeve (3) has a sleeve (32) and a weight portion (34) connected to the sleeve (32) by a connecting portion (33), the sleeve (32) is sleeved on the second protruding shaft section (23), and the first arc and/or the second arc is within a projection range of the sleeve (32) on the first projection plane.

5. The eccentric shaft assembly according to claim 4, characterized in that the rotational angle limiting structure (31) is at the side of the connection (33) facing the drive spindle (1).

6. The eccentric shaft assembly according to claim 1, characterized in that any plane perpendicular to the axis of the drive spindle (1) is a first projection plane, on the projection of which the projection of the eccentric (21) is a first circle, the projection of the rotational angle limiting structure (31) comprises a third arc and a fourth arc intersecting, the first rotational angle limit position comprises a first point (315) tangential to the first circle, the second rotational angle limit position comprises a second point (316) tangential to the first circle, wherein the first point (315) is on the third arc and the second point (316) is on the fourth arc.

7. The eccentric shaft assembly according to claim 1, characterized in that any plane perpendicular to the axis of the drive spindle (1) is a first projection plane, on the projection of which the projection of the eccentric portion (21) is a first sector, the projection of the rotational angle limiting structure (31) comprises a first limiting edge (317) corresponding to a first radial edge of the first sector and a second limiting edge (318) corresponding to a second radial edge of the first sector, the first rotational angle limiting bit comprises the first limiting edge (317), and the second rotational angle limiting bit comprises the second limiting edge (318).

8. The eccentric shaft assembly according to claim 1, characterized in that the contact part of the eccentric part (21) and the rotation angle limiting structure (31) is provided with a vibration damping and sound absorbing material; and/or the eccentric part (21) is integrally formed with the eccentric shaft (2); or the eccentric part (21) and the eccentric shaft (2) are detachably connected.

9. A scroll compressor comprising the eccentric shaft assembly of any one of claims 1 to 8.

10. An air conditioner characterized by comprising the scroll compressor of claim 9.

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