CN221299481U - Compressor crankshaft, variable-frequency rolling single-rotor compressor and air conditioner - Google Patents

Abstract

A compressor crankshaft, a variable frequency rolling single rotor compressor and an air conditioner comprise a long shaft, a short shaft and an eccentric part; the long shaft and the short shaft are connected to form a shaft body, and the eccentric part is arranged on the shaft body; the eccentric part comprises a thrust and a cam, wherein the thrust and the cam are both eccentrically arranged on the shaft body, and the cam is coated on the outer side of the thrust. The thrust and the cams are uniformly distributed with the lightening structures, so that centrifugal inertia force and inertia moment of the rolling single-rotor compressor caused by eccentric operation can be greatly reduced, balancing weights and masses of the motor rotor are effectively reduced, and wind resistance is reduced.

Description

Compressor crankshaft, variable-frequency rolling single-rotor compressor and air conditioner

Technical Field

The utility model relates to the technical field of air conditioners, in particular to a compressor crankshaft, a variable-frequency rolling single-rotor compressor and an air conditioner.

Background

In recent years, in order to save cost, a single-rotor type variable frequency air conditioner is adopted. The symmetrical structure of the double-rotor compressor enables the self-rotation inertia force of the double-rotor compressor to be balanced, and only the rotation inertia moment generated by the fact that two eccentric masses are not on the same plane needs to be balanced. The motor balancing weight has small mass and low height, and the running wind resistance generated by the balancing weight is small, so the vibration of the whole machine is low. With the development of compressor technology, rolling rotor compressor single rotors have become a trend. The single rotor compressor is configured to have eccentric rotation characteristics of the eccentric portion and the piston, so that centrifugal inertial force generated during operation of the compressor cannot be balanced by itself, and the centrifugal inertial force needs to be offset by balancing weights at both ends of the motor rotor. Therefore, the weight of the balancing weight is unbalanced due to the eccentric part, and on the other hand, the centrifugal inertia force of the eccentric part needs to be counteracted due to the symmetrical structure without the double rotors, so that the motor balancing weight has large weight and high height compared with the double rotors. When the rolling single-rotor variable frequency compressor runs, the lower thrust of the eccentric part of the crankshaft is propped against the end face of the auxiliary bearing, the thrust surface of the auxiliary bearing bears the weight of the crankshaft and the motor rotor, but the thrust surface is of a planar structure, so that an oil film at the thrust surface is easy to break when the compressor rotates at a high speed, and abnormal abrasion is caused. The single rotor rolling rotor compressor has its complete vibration and power deteriorated due to the wind resistance of the balance weight and the wear of the thrust surface of the eccentric part.

Disclosure of utility model

The utility model aims to provide a compressor crankshaft, a variable-frequency rolling single-rotor compressor and an air conditioner, so as to solve the problem of increased running wind resistance caused by large rotor weights of a rotor compressor and a motor.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

a compressor crankshaft comprises a long shaft, a short shaft and an eccentric part; the long shaft and the short shaft are connected to form a shaft body, and the eccentric part is arranged on the shaft body; the eccentric part comprises a thrust and a cam, wherein the thrust and the cam are both eccentrically arranged on the shaft body, and the cam is coated on the outer side of the thrust.

Further, the thrust is provided with lightening holes along the axial length, the lightening holes are symmetrically distributed along the symmetry axis of the eccentric part, the number is n, and n is more than or equal to 1 and less than or equal to 7.

Further, the axial length of the thrust is H, the axial length of the cam is H, and H/H is more than or equal to 0.7 and less than or equal to 0.9.

Further, the inner radius of the thrust is r1, the minor axis radius is r, and the requirement that r1 is more than or equal to r is met.

Further, the diameter of the lightening hole on the thrust is phi, the outer radius of the thrust is r2, and (r 2-r 1)/2 is less than or equal to phi and less than or equal to (r 2-r 1) -1.2.

Furthermore, the cam is provided with lightening structures along the axial length, the lightening structures are symmetrically distributed along the symmetry axis of the eccentric part, the number of the lightening structures is N, and N is more than or equal to 1 and less than or equal to 7.

Further, the radius of the cam is R, the inner radius of the lightening structure is R1, the outer radius is R2, and R2 is less than or equal to R1, and R2 is less than or equal to R-1; r, R2 the center of a circle coincides with the axis of the eccentric part, and R1 the center of a circle coincides with the axis of the long shaft; the two axes are converged to an eccentric e in the direction of the symmetry axis of the eccentric part.

Further, the width of the lightening structure is a, and a is more than or equal to 1.5 and less than or equal to 2 times R2.

Further, the variable-frequency rolling single-rotor compressor comprises a compressor and a compressor crankshaft, wherein the compressor crankshaft is arranged on the compressor.

Further, the variable frequency air conditioner comprises a variable frequency rolling single-rotor compressor.

Compared with the prior art, the utility model has the following technical effects:

The thrust and the cams are uniformly distributed with the lightening structures, so that centrifugal inertia force and inertia moment of the rolling single-rotor compressor caused by eccentric operation can be greatly reduced, balancing weights and masses of the motor rotor are effectively reduced, and wind resistance is reduced. Meanwhile, oil can be stored in the crankshaft thrust lightening holes, and when the compressor runs at a high speed, the oil stored in the holes is lightened, so that the oil film thickness of the thrust surface can be effectively ensured, and abnormal abrasion is prevented. Therefore, the crankshaft structure improves the windage of the balance weight of the single-rotor rolling rotor compressor and the abrasion of the thrust surface of the eccentric part.

Drawings

FIG. 1 is a schematic diagram of a crankshaft according to an embodiment of the present utility model;

FIG. 2 is a perspective view of a crankshaft according to a first embodiment of the present utility model;

FIG. 3 is an enlarged scale illustration of a crankshaft eccentric portion provided in accordance with a first embodiment of the present utility model;

FIG. 4 is a perspective view of a crankshaft according to a second embodiment of the present utility model;

FIG. 5 is an enlarged scale drawing of a eccentric portion of a crankshaft according to a second embodiment of the present utility model;

FIG. 6 is a schematic diagram of a rolling single rotor variable frequency compressor.

Reference numerals illustrate:

1, a crankshaft; 2, a piston; 3, a motor rotor; 4, a motor stator; 5-cylinder; 6-auxiliary bearings; 11 eccentric parts; 12-long axis; short axis-13; 111 thrust; 111' -lower thrust; 111 "-upper thrust; 112-a cam; 1111-lightening holes; 1121-a mitigation structure; 31-a motor rotor lower balance weight; 32-a balancing block on the motor rotor; e-eccentricity.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that, as the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used for convenience in describing the present utility model and simplifying the description based on the azimuth or positional relationship shown in the drawings, it should not be construed as limiting the present utility model, but rather should indicate or imply that the devices or elements referred to must have a specific azimuth, be constructed and operated in a specific azimuth. Furthermore, the terms "first," "second," "third," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance.

In the description of the present utility model, it should be noted that unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1, the eccentric portion 11 of the crankshaft is composed of two parts, a thrust 111 and a cam 112. The axial length of the thrust 111 is H, the axial length of the cam 112 is H, and H/H is more than or equal to 0.7 and less than or equal to 0.9.

As shown in the crankshaft 1 of FIG. 2, the crankshaft thrust 111 has lightening holes 1111 distributed along the axial length, the lightening holes are symmetrically distributed along the symmetry axis O-O', the number is n, and 1.ltoreq.n.ltoreq.7. The diagram n=1.

As shown in the crankshaft 1 of FIG. 2, the inner radius of the crankshaft thrust 111 is r1, and the radius of the short shaft 13 of the crankshaft 1 is r, then r1 is equal to or greater than r.

As shown in the crankshaft 1 of FIG. 2, the diameter of the lightening hole 1111 in the crankshaft thrust 111 is phi, and when the outer radius of the thrust 111 is r2, (r 2-r 1)/2.ltoreq.phi.ltoreq.r 2-r 1) -1.2. The centers of r1 and r2 are coincident with the axis of the long shaft 12.

As shown in FIG. 2, the cam 112 of the eccentric part 11 of the crankshaft 1 is provided with lightening structures 1121 distributed along the axial length, the lightening structures are symmetrically distributed along the symmetry axis O-O', the number is N, and N is more than or equal to 1 and less than or equal to 7. The diagram n=1.

As shown in FIG. 3, the radius of the cam 112 of the eccentric part of the crankshaft 1 is R, the inner radius of the lightening structure 1121 on the cam is R1, and the outer radius of the lightening structure is R2, and then R2 is less than or equal to R1, and R2 is less than or equal to R-1.R, R2 the center of a circle coincides with the axis of the eccentric part 11, and R1 the center of a circle coincides with the axis of the long shaft 12. The two axes are separated by an eccentricity e in the direction of O-O'.

As shown in fig. 3, the width of the lightening structure 1121 on the cam 112 of the eccentric portion of the crankshaft 1 is a, and a is 1.5.ltoreq.a.ltoreq.2×r2.

The utility model also provides a variable frequency rolling single rotor compressor which comprises the crankshaft 1.

The utility model also provides an air conditioner which comprises the variable-frequency rolling single-rotor compressor, and can effectively improve the vibration and thrust abrasion of the compressor, thereby reducing the pipeline vibration of the air conditioner and the running power of the air conditioner.

Example two

As shown in the crankshaft 1 of FIG. 4, the crankshaft thrust 111 has lightening holes 1111 distributed along the axial length, the lightening holes are symmetrically distributed along the symmetry axis O-O', the number is n, and 1.ltoreq.n.ltoreq.7. The diagram n=7.

As shown in FIG. 5, the cam 112 of the eccentric part 11 of the crankshaft 1 is provided with lightening structures 1121 distributed along the axial length, the lightening structures are symmetrically distributed along the symmetry axis O-O', the number is N, and N is more than or equal to 1 and less than or equal to 7. The diagram n=7.

As shown in fig. 6, the power transmission in the rolling single-rotor variable frequency compressor is mainly completed by a crankshaft 1, the crankshaft is provided with an eccentric part 11, the central axis of the eccentric part is eccentrically arranged relative to the rotation center of the crankshaft, a long shaft 12 of the crankshaft is thermally sleeved with a motor rotor 3, when the compressor operates, the crankshaft 1 drives a piston 2 to rotate away from the rotation center of the long shaft 12 of the crankshaft under the driving of a motor stator 4 and the motor rotor 3, and centrifugal inertia force and inertia moment generated by rotation need to be balanced through balancing weights 31 and 32 positioned at two ends of the motor rotor. Meanwhile, when the compressor runs, the lower thrust 111' of the thrust 111 of the eccentric part 11 of the crankshaft 1 is abutted against the end face of the auxiliary bearing 5, the thrust face of the auxiliary bearing 5 carries the weight of the crankshaft 1, and the motor rotor 3 is of a planar structure, so that an oil film at the thrust face is easy to break when the compressor rotates at a high speed, and abnormal abrasion is caused. Therefore, the single-rotor rolling rotor compressor can make the whole machine vibration and power of the compressor worsen due to the abrasion of the thrust surface of the eccentric part and the windage of the balance weight.

Based on the problems, the crankshaft eccentric part 11, the thrust 111 and the cam 112 are respectively distributed with a lightening structure, so that centrifugal inertia force and inertia moment of the rolling single-rotor compressor caused by eccentric operation can be greatly reduced, the mass of balancing weights 31 and 32 of a motor rotor 3 is effectively reduced, and wind resistance is reduced. Meanwhile, the lightening holes 1111 of the crankshaft thrust 111 can store oil, and when the compressor runs at a high speed, the lightening of the oil stored in the holes can effectively ensure the thickness of an oil film of a thrust surface and prevent abnormal abrasion. Therefore, the crankshaft structure improves the windage of the balance weight of the single-rotor rolling rotor compressor and the abrasion of the thrust surface of the eccentric part.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. A compressor crankshaft, characterized by comprising a long shaft (12), a short shaft (13) and an eccentric portion (11); the long shaft (12) and the short shaft (13) are connected to form a shaft body, and the eccentric part (11) is arranged on the shaft body; the eccentric part (11) comprises a thrust (111) and a cam (112), wherein the thrust (111) and the cam (112) are eccentrically arranged on the shaft body, and the cam (112) is coated on the outer side of the thrust (111).

2. A compressor crankshaft according to claim 1, characterized in that the thrust (111) has lightening holes (1111) distributed along the axial length, the lightening holes being symmetrically distributed along the symmetry axis of the eccentric (11), the number n being 1.ltoreq.n.ltoreq.7.

3. A compressor crankshaft according to claim 1, wherein the thrust (111) has an axial length H, the cam (112) has an axial length H, and 0.7-H/H-0.9.

4. A compressor crankshaft according to claim 1, wherein the thrust (111) has an inner radius r1 and the stub (13) has a radius r, satisfying r 1. Gtoreq.r.

5. A compressor crankshaft as claimed in claim 4, wherein the diameter of the lightening hole (1111) of the thrust block (111) is Φ, and the outer radius of the thrust block (111) is r2, satisfying (r 2-r 1)/2 Φ (r 2-r 1) -1.2.

6. A compressor crankshaft according to claim 1, wherein the cams (112) are provided with lightening structures (1121) distributed along the axial length, the lightening structures being symmetrically distributed along the symmetry axis of the eccentric portion (11), the number N being 1.ltoreq.n.ltoreq.7.

7. The compressor crankshaft of claim 5 wherein the cam (112) has a radius R, the relief structure (1121) has an inner radius R1 and an outer radius R2, R2 being equal to or less than R1, R2 being equal to or less than R-1; r, R2 the center of a circle is coincident with the axis of the eccentric part (11), and the center of a circle R1 is coincident with the axis of the long shaft (12); the two axes are converged to an eccentric e in the direction of the symmetry axis of the eccentric part (11).

8. A compressor crankshaft according to claim 7, wherein the width of the relief structure (1121) is a, satisfying 1.5.ltoreq.a.ltoreq.2 x r2.

9. A variable frequency rolling single rotor compressor comprising a compressor and a compressor crankshaft according to any one of claims 1 to 8, the compressor crankshaft being mounted on the compressor.

10. A variable frequency air conditioner comprising the variable frequency rolling single rotor compressor of claim 9.