阅读说明：本技术 压缩机的轴承、压缩机及制冷设备 (Bearing of compressor, compressor and refrigeration equipment ) 是由 郭莉娟 叶容君 陈晓育 于 2021-08-26 设计创作，主要内容包括：本发明公开了一种压缩机的轴承、压缩机及制冷设备,其中轴承包括轴承部和法兰部,轴承部设有轴孔,轴孔沿轴承部的轴向贯穿轴承部,法兰部设于轴承部的外周壁；通过在轴孔的内周壁设置第一凹部和第二凹部,且第一凹部和第二凹部为轴对称设置,使轴孔内周壁形成对称的凹陷结构；相对于传统轴承的呈规则圆形的轴孔,通过第一凹部和第二凹部能够改变曲轴与轴孔的内周壁的间隙,从而使得沿圆周方向的油膜刚度和阻尼不同,达到调谐法兰部周向刚度不均匀带来的曲轴和转子组件振动问题,同时可以降低轴承和轴孔间的摩擦损耗,有利于提高压缩机性能。(The invention discloses a bearing of a compressor, the compressor and refrigeration equipment, wherein the bearing comprises a bearing part and a flange part, the bearing part is provided with a shaft hole, the shaft hole penetrates through the bearing part along the axial direction of the bearing part, and the flange part is arranged on the peripheral wall of the bearing part; the first concave part and the second concave part are arranged on the inner peripheral wall of the shaft hole and are arranged in an axisymmetric mode, so that the inner peripheral wall of the shaft hole forms a symmetrical concave structure; compared with a regular circular shaft hole of a traditional bearing, the gap between the crankshaft and the inner peripheral wall of the shaft hole can be changed through the first concave part and the second concave part, so that the oil film rigidity and the damping along the circumferential direction are different, the vibration problem of the crankshaft and the rotor assembly caused by uneven circumferential rigidity of the tuning flange part is solved, meanwhile, the friction loss between the bearing and the shaft hole can be reduced, and the performance of the compressor is favorably improved.)

1. A bearing for a compressor, comprising:

a bearing portion provided with a shaft hole that penetrates the bearing portion in an axial direction of the bearing portion;

a flange portion provided on an outer peripheral wall of the bearing portion;

the inner circumferential wall of the shaft hole is provided with a first concave portion and a second concave portion, the first concave portion and the second concave portion extend along the circumferential direction of the shaft hole, and the first concave portion and the second concave portion are arranged in an axisymmetric mode.

2. The bearing of claim 1, wherein at least a partial contour of the first recess and the second recess on a plane of projection perpendicular to the axial direction comprises at least one of a circular arc or a spline curve.

3. The bearing of claim 2, wherein at least a portion of contours of the first and second recesses comprise straight lines that connect with contours of the inner circumferential wall.

4. The bearing according to any one of claims 1 to 3, wherein the maximum depth of the first recess and the second recess in the radial direction of the shaft hole is A, and 0mm < A ≦ 0.15mm is satisfied.

5. The bearing according to claim 1, wherein the contour lines of the first concave portion and the second concave portion and the contour line of the inner circumferential wall enclose an elliptical contour line on a projection plane perpendicular to the axial direction.

6. The bearing of claim 1, wherein the first and second recesses are located at least at an end of the bearing portion distal from the flange portion, and both the first and second recesses extend in the axial direction.

7. A compressor comprising a cylinder, a crankshaft, a rotor assembly, an upper bearing and a lower bearing, wherein a piston is arranged in the cylinder, the rotor assembly drives the piston to rotate in the cylinder through the crankshaft, the upper bearing and the lower bearing are used for supporting the crankshaft, and the upper bearing and/or the lower bearing are/is the bearing of any one of claims 1 to 6.

8. The compressor of claim 7, wherein a sliding vane is further disposed in the cylinder, a central axis of the sliding vane along a radial direction of the shaft hole is a 0 ° line, a connecting line between maximum distances of the first concave portion and the second concave portion is a long axis, an included angle between the long axis and the O ° line is Φ 1, and the included angle is 0 ° ≦ Φ 1 ≦ 100 °.

9. The compressor of claim 8, wherein, in the circumferential direction of the shaft hole, the central angle corresponding to the connection of the two ends of the first concave portion and the center of the shaft hole is Φ 2, and the central angle corresponding to the connection of the two ends of the second concave portion and the center of the shaft hole is Φ 3, and the requirements of 20 ° ≦ Φ 2 ≦ 180 °, and 20 ° ≦ Φ 3 ≦ 180 °, are satisfied.

10. The compressor of claim 8, wherein a line in the shaft hole perpendicular to the long axis and passing through a center of the shaft hole is a short axis, a difference between a radius of the shaft hole in the direction of the long axis and a radius of the crankshaft is B, a difference between a radius of the shaft hole in the direction of the short axis and a radius of the crankshaft is C, and 2 ≤ B/C ≤ 13 is satisfied.

11. A refrigeration apparatus, characterized by comprising a compressor according to any one of claims 7 to 10.

Technical Field

The invention relates to the technical field of compressors, in particular to a bearing of a compressor, the compressor and refrigeration equipment.

Background

In the related technology, a rotor assembly of the compressor drives a crankshaft to rotate, the crankshaft is supported by an upper bearing and a lower bearing, the rotor assembly is close to one side of the upper bearing, the support mode can be regarded as a cantilever-like support mode, and when the compressor runs, a bending swing mode of the rotor assembly is easily excited under the combined action of unbalanced magnetic tension of a motor and uneven circumferential rigidity of a flange part to generate vibration; and the crankshaft is in dynamic pressure lubrication and is in an inclined state when running in the two bearing structures, so that an unstable oil film is formed between the crankshaft and the bearings, the friction loss is increased, the vibration of the crankshaft is aggravated, and further noise radiation is generated.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the bearing of the compressor can improve the stability of an oil film between a crankshaft and the bearing, is beneficial to inhibiting the bending vibration of a rotor assembly, effectively reduces noise radiation, and is more practical and reliable.

The invention also provides a compressor and refrigeration equipment comprising the bearing.

A bearing of a compressor according to an embodiment of a first aspect of the present invention includes:

a bearing portion provided with a shaft hole that penetrates the bearing portion in an axial direction of the bearing portion;

a flange portion provided on an outer peripheral wall of the bearing portion;

the inner circumferential wall of the shaft hole is provided with a first concave portion and a second concave portion, the first concave portion and the second concave portion extend along the circumferential direction of the shaft hole, and the first concave portion and the second concave portion are arranged in an axisymmetric mode.

The bearing of the compressor provided by the embodiment of the invention has at least the following beneficial effects:

the first concave part and the second concave part are arranged on the inner peripheral wall of the shaft hole and are arranged in an axisymmetric mode, so that the inner peripheral wall of the shaft hole forms a symmetrical concave structure; compared with a regular circular shaft hole of a traditional bearing, the gap between the crankshaft and the inner peripheral wall of the shaft hole can be changed through the first concave part and the second concave part, so that the oil film rigidity and the damping along the circumferential direction are different, the vibration problem of the crankshaft and the rotor assembly caused by uneven circumferential rigidity of the tuning flange part is solved, meanwhile, the friction loss between the bearing and the shaft hole can be reduced, and the performance of the compressor is favorably improved.

According to some embodiments of the invention, at least a partial contour line of the first concavity and the second concavity includes at least one of a circular arc line or a spline curve on a projection plane perpendicular to the axial direction.

According to some embodiments of the invention, at least part of the contour lines of the first and second concave portions further include a straight line connecting with the contour line of the inner circumferential wall.

According to some embodiments of the present invention, the maximum depth of the first concave portion and the second concave portion in the radial direction of the shaft hole is A, and 0mm < A ≦ 0.15mm is satisfied.

According to some embodiments of the present invention, on a projection plane perpendicular to the axial direction, the contour lines of the first concave portion and the second concave portion and the contour line of the inner circumferential wall enclose an elliptical contour line.

According to some embodiments of the invention, the first recess and the second recess are located at least at an end of the bearing portion remote from the flange portion, and both the first recess and the second recess extend in the axial direction.

The compressor according to the embodiment of the second aspect of the present invention comprises a cylinder, a crankshaft, a rotor assembly, an upper bearing and a lower bearing, wherein a piston is arranged in the cylinder, the rotor assembly drives the piston to rotate in the cylinder through the crankshaft, the upper bearing and the lower bearing are used for supporting the crankshaft, and the upper bearing and/or the lower bearing are/is the bearing of any one of claims 1 to 6.

The compressor provided by the embodiment of the invention has at least the following beneficial effects:

the upper bearing of the compressor can be the bearing of the embodiment, the upper bearing is close to the rotor assembly, or the upper bearing and the lower bearing both adopt the bearing of the embodiment, and the gap between the crankshaft and the inner peripheral wall of the shaft hole can be changed through the first concave part and the second concave part, so that the oil film rigidity and the damping along the circumferential direction are different, the vibration problem of the crankshaft and the rotor assembly caused by uneven circumferential rigidity of the tuning flange part is solved, meanwhile, the friction loss between the bearing and the shaft hole can be reduced, and the performance of the compressor is improved.

According to some embodiments of the invention, a sliding sheet is further arranged in the cylinder, a central axis of the sliding sheet along the radial direction of the shaft hole is a 0-degree line, a connecting line between the maximum distances of the first concave part and the second concave part is a long axis, an included angle between the long axis and the O-degree line is phi 1, and the included angle is more than or equal to 0 degrees and less than or equal to phi 1 and less than or equal to 100 degrees.

According to some embodiments of the invention, in the circumferential direction of the shaft hole, a central angle corresponding to connection of both ends of the first concave portion and the center of the shaft hole is phi 2, and a central angle corresponding to connection of both ends of the second concave portion and the center of the shaft hole is phi 3, and the requirements that phi 2 is greater than or equal to 20 degrees and phi 3 is greater than or equal to 180 degrees are satisfied.

According to some embodiments of the present invention, a connection line in the shaft hole perpendicular to the long axis and passing through a center of the shaft hole is a short axis, a difference between a radius of the shaft hole in the direction of the long axis and a radius of the crankshaft is B, a difference between a radius of the shaft hole in the direction of the short axis and a radius of the crankshaft is C, and B/C is greater than or equal to 2 and less than or equal to 13.

The refrigeration equipment provided by the embodiment of the third aspect of the invention comprises the compressor provided by the embodiment of the second aspect.

The refrigeration equipment adopts all the technical solutions of the compressor of the above embodiments, and therefore has at least all the advantages brought by the technical solutions of the above embodiments.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic plan view of a bearing according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of a bearing according to an embodiment of the present invention;

FIG. 3 is a schematic front view of a bearing according to an embodiment of the present invention;

FIG. 4 is an enlarged schematic view of a shaft hole according to an embodiment of the present invention;

FIG. 5 is a schematic front view of a bearing according to another embodiment of the present invention;

FIG. 6 is an enlarged schematic view of a shaft hole according to another embodiment of the present invention;

fig. 7 is a schematic view of an internal structure of a compressor according to an embodiment of the present invention.

Reference numerals:

a bearing 100; a flange portion 110; a valve seat 111; an exhaust hole 112; mounting holes 113; a bearing portion 120; a shaft hole 130; the first recess 131; a second recess 132; an inner circumferential wall 133; a major axis 134; a short shaft 135; a control line 136;

an upper bearing 200;

a lower bearing 300;

a cylinder 400; a slip sheet 410;

a rotor assembly 500;

crankshaft 600.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "axial," "radial," "circumferential," "up," "down," and the like refer to an orientation or positional relationship based on that shown in the drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, is not to be construed as limiting the present invention.

In the description of the present invention, greater than, less than, exceeding, etc. are understood as excluding the present numbers, and the above, below, inside, etc. are understood as including the present numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, it should be noted that the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the terms in the present invention by combining the specific contents of the technical solutions.

At present, most compressors are designed towards miniaturization, light weight and high efficiency, so that the noise problem is increasingly prominent. The rotary compressor generally utilizes a rotor assembly to drive a crankshaft to rotate, a piston is driven to rotate in a cylinder through the crankshaft, an upper bearing and a lower bearing are respectively arranged on two sides of the cylinder, the crankshaft is supported through the upper bearing and the lower bearing, and the rotor assembly is located above the cylinder and close to the upper bearing.

This support mode can be regarded as a class cantilever support mode, and when the operation, the crooked swing mode of rotor subassembly is aroused more easily under the uneven combined action of the unbalanced magnetic pull of motor and flange portion circumference rigidity, produces the vibration, and the rotor subassembly operation is unstable, and the bent axle is in the dynamic pressure lubrication when operation in two bearing arrangement, is the tilt state, forms unstable oil film between messenger's bent axle and the bearing, and increase friction loss leads to its vibration aggravation, and then produces the noise radiation.

According to the bearing 100 suitable for the compressor provided by the embodiment of the invention, the first concave part 131 and the second concave part 132 are arranged on the inner circumferential wall 133 of the shaft hole 130, the first concave part 131 and the second concave part 132 are arranged in an axisymmetric manner, and the inner circumferential wall 133 of the shaft hole 130 forms a symmetrical concave structure. Compared with the regular circular shaft hole 130, the gap between the crankshaft 600 and the inner peripheral wall 133 of the shaft hole 130 can be changed through the first concave part 131 and the second concave part 132, the contact area between the bearing 100 and the crankshaft 600 can be reduced, the stability of an oil film is improved, the friction loss between the bearing 100 and the shaft hole 130 is reduced, the rigidity and the damping of the oil film along the circumferential direction can be different through the symmetrically distributed concave parts, the problem that the crankshaft 600 and the rotor assembly 500 vibrate due to the fact that the circumferential rigidity of the tuning flange part 110 is uneven is solved, vibration noise is effectively reduced, and the structure is more practical and reliable.

The bearing 100 according to the embodiment of the present invention is described with reference to fig. 1 to 6, and is applicable to a rotary compressor, and particularly, may be used as the upper bearing 200 or the lower bearing 300 of the cylinder 400, and the bearing 100 will be described below with a specific example.

Referring to fig. 1, a bearing 100 according to an embodiment of the present invention includes a flange portion 110 and a bearing portion 120, the bearing portion 120 is connected to a central position of the flange portion 110, the flange portion 110 is located on an outer circumferential wall of the bearing portion 120, and the flange portion 110 is configured to be connected to a shell of a compressor. Bearing portion 120 is provided with a shaft hole 130, shaft hole 130 penetrates bearing portion 120 in the axial direction of bearing portion 120, shaft hole 130 is matched with crankshaft 600 of the compressor, shaft hole 130 is used for penetrating crankshaft 600, and crankshaft 600 is rotatably assembled on bearing 100.

Referring to fig. 1 and 2, the bearing portion 120 has a substantially cylindrical shape, the flange portion 110 has a substantially circular disk shape, the position where the bearing portion 120 is connected to the flange portion 110 is a bearing root portion, and the bearing portion 120 and the flange portion 110 are integrally formed. Due to the presence of the valve seat 111 and the exhaust hole 112, the circumferential rigidities of the flange portion 110 and the bearing portion 120 are not uniform, thereby affecting oil film formation.

It should be noted that, the shaft hole of the conventional bearing is regular circular, that is, the cross section of the shaft hole is circular, the inner peripheral wall of the shaft hole is a circular arc surface, and because the crankshaft has an eccentric structure, the crankshaft is affected by the acting force of compressed gas, the bearing supporting force and the like to generate bending deformation in the use process, and the deformation of the rotor assembly is increased under the combined action of unbalanced magnetic pulling force of the motor and uneven circumferential rigidity of the flange part, and an unstable oil film is formed between the crankshaft and the bearing, so that the crankshaft is subjected to adverse effects such as abrasion, vibration and the like, and further generates noise.

In the embodiment of the present invention, two recesses are disposed in the shaft hole 130, and the two recesses are symmetrically disposed. Compared with the regular circular shaft hole 130, the gap between the crankshaft 600 and the inner peripheral wall 133 of the shaft hole 130 can be changed through the concave part, so that the oil film rigidity and the damping along the circumferential direction are different, and the problem of vibration of the crankshaft 600 and the rotor assembly 500 caused by uneven circumferential rigidity of the tuning flange part 110 is solved.

Specifically, a first recess 131 and a second recess 132 are provided on an inner circumferential wall 133 of the shaft hole 130, and both the first recess 131 and the second recess 132 are transitionally connected to the inner circumferential wall 133 of the shaft hole 130. In the embodiment shown in fig. 1, the dotted line in the circumferential direction in the shaft hole 130 is a comparison line 136 of the inner circumferential wall 133 of the shaft hole 130 with respect to the first recess 131 and the second recess 132.

In the embodiment, the inner circumferential wall 133 of the shaft hole 130 is formed in a cylindrical shape as a whole, and the diameter of the shaft hole 130 is slightly larger than the diameter of the crankshaft 600, so that the crankshaft 600 can rotate in the shaft hole 130. The first recess 131 and the second recess 132 are arranged along the circumferential direction of the shaft hole 130, and at radial positions corresponding to the first recess 131 and the second recess 132, a gap between the crankshaft 600 and the inner circumferential wall 133 can be increased, a contact area between the inner circumferential wall 133 and the crankshaft 600 is reduced, and a stable oil film is favorably formed in a dynamic pressure lubrication process of the crankshaft 600, so that the bearing capacity of the oil film is effectively improved.

It can be understood that, because the first concave part 131 and the second concave part 132 are symmetrically arranged, the oil films formed at the positions of the first concave part 131 and the second concave part 132 are also symmetrically distributed, and the symmetrically distributed oil films can provide a symmetrical bearing capacity for the crankshaft 600, so that on one hand, the friction between the crankshaft 600 and the bearing 100 can be reduced, and further, the purpose of reducing the friction loss can be achieved; on the other hand, the bearing capacity of the symmetrical distribution can be beneficial to reducing the vibration of the crankshaft 600, and the vibration caused by the bending and swinging of the upper part of the rotor assembly 500 can be inhibited, so that the influence of unbalanced magnetic tension on the rotor assembly 500 and the uneven circumferential rigidity of the flange part 110 is reduced, the generation of vibration noise is effectively reduced, and the structure is simple and practical.

It should be noted that, as shown in fig. 3 and 4, in the embodiment, the first recess 131 and the second recess 132 respectively extend along the circumferential direction of the shaft hole 130, so that the shaft hole 130 forms a similar elliptical shape on the cross section where the two recesses are located.

The projection plane along the axial direction is taken as a reference plane, and the projection plane is perpendicular to the axial direction of the shaft hole 130, and it can be understood that the projections of the first concave portion 131 and the second concave portion 132 and the inner circumferential wall 133 of the shaft hole 130 on the projection plane respectively have contour lines. Since the first concave portion 131 and the second concave portion 132 are symmetrically distributed in the circumferential direction, and projected contour lines thereof are also symmetrically distributed, contour lines of the first concave portion 131 and the second concave portion 132 are uniformly transitionally connected with contour lines of the inner circumferential wall 133.

Referring to fig. 4, a dotted line in the circumferential direction in the shaft hole 130 in fig. 4 is a comparison line 136 of the first recess 131 and the second recess 132 with respect to the inner circumferential wall 133 of the shaft hole 130, wherein the crankshaft 600 can be understood to match the position of the dotted line, the contour lines of the first recess 131 and the second recess 132 are substantially arc-shaped, and the gaps between the two recesses and the crankshaft 600 vary in the circumferential direction. Specifically, the two recesses are understood to be symmetrical concave structures formed on the inner circumferential wall 133 of the shaft hole 130, and both the two recesses are transitionally connected with the inner circumferential wall 133, and a non-circular contour line is defined on a projection plane by the two recesses and the inner circumferential wall 133. In this way, relative to the position where the crankshaft 600 is in close contact with the inner circumferential wall 133, a stable oil film can be formed in the gap between the first concave portion 131, the second concave portion 132 and the crankshaft 600, and the bearing capacity of the oil film at the symmetrical position can be improved without destroying the integrity of the oil film in the shaft hole 130, so that on one hand, the friction loss between the crankshaft 600 and the shaft hole 130 can be reduced, on the other hand, the symmetrical concave portions generate a stable oil film, and have a bearing effect symmetrical in the radial direction, thereby being beneficial to inhibiting the vibration caused by the bending swing of the rotor assembly 500, achieving the problem of the vibration of the crankshaft 600 and the rotor assembly 500 caused by the non-uniform circumferential rigidity of the tuning flange portion 110, and further effectively reducing the generation of vibration noise.

Referring to fig. 3 and 4, in some embodiments, at least a portion of the contour line of the shaft hole 130 is a circular arc line, and the contour lines of the first concave portion 131 and the second concave portion 132 are circular arc lines, so that the gap distance can be uniformly changed. It is understood that the number of arc segments of the arc lines of the two concave portions may be one or more, that is, the outlines of the first concave portion 131 and the second concave portion 132 may be formed by connecting one or more arc lines.

It should be noted that, the gaps between the first concave portion 131 and the second concave portion 132 and the crankshaft 600 may also vary with the number of segments of the arc line, and the stability of the oil film may be greatly improved by increasing the number of segments of the arc line within a certain gap range, where the number of segments of the arc line is specifically set according to the requirement of the gap between the concave portion and the crankshaft 600, for example, the number of segments of the arc line may be 3, 4, 5, and the like, and is not limited specifically.

In some embodiments, it is understood that at least part of the contour lines of the first concave portion 131 and the second concave portion 132 may also be spline curves, and the number of the spline curves of the two concave portions may be one or more, that is, the contour lines of the first concave portion 131 and the second concave portion 132 may be formed by connecting one or more spline curves. The spline curve means a curve obtained by giving a set of control points, the approximate shape of which is controlled by the control points, by which recesses can be constructed so that the clearances between the two recesses and crankshaft 600 can be uniformly changed in the circumferential direction.

For example, taking the first concave part 131 as an example, the gap at the center of the first concave part 131 is maximized, the gaps at both sides are symmetrically distributed, and the first concave part 131 and the inner peripheral wall 133 of the shaft hole 130 are smoothly transited by connecting a plurality of spline curves, which is beneficial to improving the stability of the oil film.

It should be noted that the contour lines of the two recesses may also be a combination of a circular arc line and a spline curve, and the number of segments of the circular arc line and the spline curve is not limited to one segment, for example, a plurality of circular arc lines and a plurality of spline curves may be connected to form the contour line of the first recess 131; for another example, the middle positions of the first recesses 131 are connected by spline curves, and both sides of the first recesses 131 are connected to the contour line of the shaft hole 130 by arc lines, so that the clearance between the first recesses 131 and the crankshaft 600 is uniformly changed or changed at intervals in the circumferential direction by the combination of the arc lines and the spline curves, and the first recesses 131 and the inner circumferential wall 133 of the shaft hole 130 are smoothly transited, thereby effectively improving the stability of the oil film.

In some embodiments, the outlines of the first recess 131 and the second recess 132 are connected to the outline of the shaft hole 130 by a straight line, which is not shown in the drawings. For example, both ends of the contour line of the first recess 131 are connected with the contour line of the shaft hole 130 through straight line transition, so that the first recess 131 and the inner circumferential wall 133 of the shaft hole 130 are in plane transition along the circumferential direction of the shaft hole 130, the transition position has enough smoothness, and the requirements of continuity and smoothness are met, so that the jump of the oil film thickness change is small, the friction between the crankshaft 600 and the inner circumferential wall 133 of the shaft hole 130 is favorably reduced, and the vibration can be reduced.

The contour lines of the first concave portion 131 and the second concave portion 132 may be a combination of an arc line and a straight line, a combination of a spline curve and a straight line, or a combination of an arc line, a spline curve and a straight line, and the above-described combination structure is not shown in the drawing.

Referring to fig. 4, it can be understood that the first and second recesses 131 and 132 extend in the circumferential direction of the shaft hole 130 and are transitionally connected with the inner circumferential wall 133 of the shaft hole 130, the gap at the transitional connection is minimized, and the contour lines of the recesses are formed according to different curves, so that gaps with different pitches can be formed. In the radial direction of the shaft hole 130, the depth of the first recess 131 and the second recess 132 may be understood as the width of the recess, and may also be understood as the radial distance of the first recess 131 and the second recess 132 from the inner circumferential wall 133 of the shaft hole 130.

In the embodiment shown in fig. 4, in the radial direction of the shaft hole 130, the depths of the two sides of the first concave part 131 and the second concave part 132 in the circumferential direction are smaller, and the depth of the middle position between the first concave part 131 and the second concave part 132 is larger, wherein the maximum depth of the two concave parts is A, and 0mm < A ≦ 0.15mm is satisfied. Because the first concave part 131 and the second concave part 132 are symmetrically arranged, the maximum depths of the first concave part 131 and the second concave part 132 are the same, and can be 0.1mm, 0.15mm and the like, so that the requirement of oil film stability is met, the reduction of the oil film stability caused by overlarge depth is avoided, and details are not repeated.

It should be noted that, in the height direction of the bearing portion 120, the height of the first concave portion 131 and the second concave portion 132 may be equal to the height of the bearing portion 120, that is, the first concave portion 131 and the second concave portion 132 extend from the upper end of the inner circumferential wall 133 to the lower end of the inner circumferential wall 133, so that the areas of the two concave portions are larger, and the generated oil film is more stable and reliable. Of course, the height of both the recesses may be smaller than the height of the bearing portion 120 so that the recesses cover at least a part of the inner circumferential wall 133 in the axial direction.

In some embodiments, the first recess 131 and the second recess 132 are preferably disposed at the upper end of the bearing portion 120, that is, the two recesses are at least located at one end of the bearing portion 120 far away from the flange portion 110, which can effectively reduce friction between the crankshaft 600 and the upper end of the bearing 100, and is beneficial to improving structural stability.

Referring to fig. 4, it can be understood that, on the projection plane in the axial direction, the contour lines of the first concave portion 131 and the second concave portion 132 and the contour line of the shaft hole 130 are arranged to surround to form a contour line in a shape of an ellipse with two sides protruding, and since the first concave portion 131 and the second concave portion 132 are arranged in an axisymmetric manner, the connection line between the maximum distances of the first concave portion 131 and the second concave portion 132 can be understood as a major axis 134 of the contour line in a shape of an ellipse, and the line perpendicular to the major axis 134 and passing through the center of the shaft hole 130 is a minor axis 135. In the embodiment, the inner circumferential wall 133 of the shaft hole 130 can be attached to the outer surface of the crankshaft 600, and stable oil films are formed in the first recess 131 and the second recess 132, respectively.

Referring to fig. 5 and 6, the contour lines of the first recess 131 and the second recess 132 and the contour line of the inner circumferential wall 133 enclose an elliptical contour line. The connecting line between the maximum distances of the first concave portion 131 and the second concave portion 132 is the major axis 134 of the elliptical contour line, and the connecting line perpendicular to the major axis 134 and passing through the center of the shaft hole 130 is the minor axis 135. The clearance between the crankshaft 600 and the inner peripheral wall 133 is small in the short axis 135 direction, and the clearance between the crankshaft 600 and the maximum depth is large in the long axis 134 direction, so that a more stable oil film can be formed, and the oil film bearing capacity can be further improved.

Referring to fig. 6, taking first recess 131 as an example, the difference between the radius of shaft hole 130 and the radius of crankshaft 600 in the direction of major axis 134 is B, the difference between the radius of shaft hole 130 and the radius of crankshaft 600 in the direction of minor axis 135 is C, and 2 ≦ B/C ≦ 13 is satisfied, that is, there is a certain gap between crankshaft 600 and the side wall of shaft hole 130 in both the directions of major axis 134 and minor axis 135, and the ratio of the gap in the direction of major axis 134 to the gap in the direction of minor axis 135 is 2 or more and 13 or less. It should be noted that, because the first concave portion 131 and the second concave portion 132 are symmetrically disposed, the maximum depth of the second concave portion 132 also satisfies the proportional relationship, which is not described in detail again. Through the setting of the proportional relation, the gap between the crankshaft 600 and the inner peripheral wall 133 in the short shaft 135 direction can meet dynamic pressure lubrication, an oil film which is more stable and symmetrically distributed can be formed in the long shaft 134 direction, the bearing capacity of the oil film is effectively improved, the vibration of the crankshaft 600 can be effectively inhibited, and the vibration reduction and noise reduction effects are better.

Referring to fig. 2, 3 and 5, in some embodiments, a valve seat 111 is provided on the flange portion 110, the valve seat 111 is used to mount an exhaust assembly (not shown), the valve seat 111 is provided with an exhaust hole 112 and a mounting hole 113, the exhaust hole 112 communicates with the cylinder 400 for discharging a refrigerant, and the mounting hole 113 is used to fix the exhaust assembly, through which the exhaust hole 112 can be opened or closed. By forming the valve seat 111 by recessing the upper surface of the flange portion 110, the valve seat 111 is disposed near the root portion of the bearing portion 120.

Considering that the flange part 110 is in a disc shape as a whole, since the valve seat 111 is formed on the upper surface of the flange part 110, the rigidity of the flange part 110 in the circumferential direction is not uniform, and the compressor exhausts air by driving the piston to compress air by the crankshaft 600, the force applied to the flange part 110 is different along with the rotation angle of the crankshaft 600, so that when the compressor operates, an unstable oil film is formed between the crankshaft 600 and the bearing 100, the friction force is increased, and the unbalanced magnetic pulling force of the motor makes the rotor assembly 500 operate unstably, which causes the vibration to be intensified, and further generates radiation noise.

Therefore, in the embodiment, the first recess 131 and the second recess 132 are provided on the inner circumferential wall 133 of the shaft hole 130, the gap between the crankshaft 600 and the inner circumferential wall 133 of the shaft hole 130 can be effectively increased by the two recesses, the contact area between the shaft hole 130 and the crankshaft 600 can be reduced, the bearing capacity of the oil film at the symmetrical position can be improved without destroying the integrity of the oil film in the shaft hole 130 during the hydrodynamic lubrication of the crankshaft 600, on one hand, the friction loss between the crankshaft 600 and the shaft hole 130 can be reduced, on the other hand, the oil film rigidity and damping along the circumferential direction can be different by the symmetrically distributed recesses, the problem of vibration of the crankshaft 600 and the rotor assembly 500 caused by the non-uniform rigidity of the tuning flange part 110 in the circumferential direction can be achieved, and the generation of vibration noise can be effectively reduced.

A compressor according to an embodiment of the present invention, which is a rotary compressor to which the bearing 100 of the above embodiment is applied, will be described with reference to fig. 7, and the compressor will be described with a specific example.

Referring to fig. 7, the compressor according to the embodiment includes a housing (not shown in the drawings), in which a cylinder 400, a crankshaft 600 and a rotor assembly 500 are installed, wherein a piston is disposed in the cylinder 400, the crankshaft 600 is connected to the rotor assembly 500, the rotor assembly 500 drives the piston to rotate in the cylinder 400 through the crankshaft 600, an upper bearing 200 is disposed on an upper side of the cylinder 400, a lower bearing 300 is disposed on a lower side of the cylinder 400, the crankshaft 600 is supported by the upper bearing 200 and the lower bearing 300, and the upper bearing 200 and the lower bearing 300 are engaged with the cylinder 400 to form a closed cavity in the cylinder 400.

The rotor assembly 500 is located above the cylinder 400 and close to the upper bearing 200, and the crankshaft 600 sequentially passes through the upper bearing 200, the cylinder 400 and the lower bearing 300 from top to bottom. Considering that the rotor assembly 500 vibrates under the unbalanced magnetic pulling force of the motor during operation, and the crankshaft 600 is in a hydrodynamic lubrication state and is in an inclined state during operation in the upper bearing 200 and the lower bearing 300, an unstable oil film is formed between the crankshaft 600 and the bearing 100, friction loss is increased, vibration of the crankshaft 600 is intensified, and noise radiation is generated.

In addition, the flange portion 110 of the upper bearing 200 is provided with the valve seat 111, so that the rigidity of the flange portion 110 in the circumferential direction is not uniform, the compressor has a special exhaust mode, the force applied to the upper bearing 200 and the lower bearing 300 is different along with the rotation angle of the crankshaft 600, the force difference between the two is large, when the compressor runs, an unstable oil film is formed between the crankshaft 600 and the upper bearing 200 and the lower bearing 300, the friction between the crankshaft 600 and the bearing 100 is increased, the vibration is further intensified, and the radiation noise is more serious. Based on this, the bearing 100 of the above embodiment may be used as the upper bearing 200, or the bearing 100 of the above embodiment may be used as both the upper bearing 200 and the lower bearing 300, so as to reduce friction between the crankshaft 600 and the bearing 100, suppress vibration of the crankshaft 600, and achieve vibration damping and noise reduction effects.

As described above with the bearing 200 as an example, the first concave portion 131 and the second concave portion 132 are disposed on the inner circumferential wall 133 of the shaft hole 130 along the circumferential direction, and the first concave portion 131 and the second concave portion 132 can reduce the contact area between the shaft hole 130 and the crankshaft 600, so that stable oil films are formed at the positions of the first concave portion 131 and the second concave portion 132 in a symmetrical distribution during the hydrodynamic lubrication of the crankshaft 600, and the bearing capacity of the oil films is effectively improved, on one hand, the friction between the crankshaft 600 and the shaft hole 130 can be reduced, the friction loss between the bearing 100 and the shaft hole 130 is reduced, the load of the compressor is reduced, the performance of the compressor is improved, and the refrigeration effect is improved; and on the other hand, the stable oil films symmetrically formed on the other side have a bearing effect symmetrical along the radial direction, so that the vibration caused by the bending swing of the rotor assembly 500 is favorably inhibited, the vibration caused by the uneven stress of the flange part 110 along the circumferential direction can be further reduced, the generation of vibration noise is effectively reduced, and the running stability of the compressor is improved.

It should be noted that the valve seat 111 may be disposed on at least one of the upper bearing 200 and the lower bearing 300, that is, the valve seat 111 may be disposed on the upper bearing 200 or the lower bearing 300, or both the upper bearing 200 and the lower bearing 300 may be disposed with the valve seat 111, so that the cylinder 400 has three exhaust structures, which is not described in detail again.

In some embodiments, a sliding vane 410 is disposed in the cylinder 400, a sliding groove is disposed on a side wall of the cylinder 400, a spring is disposed in the sliding groove, one end of the sliding vane 410 is connected to the spring, and the other end of the sliding vane 410 abuts against the piston under the action of the spring, so that the cavity of the cylinder 400 is partitioned to form an air inlet cavity and an air outlet cavity, and the valve seat 111 is disposed near the sliding vane 410. The figures do not show the specific structure of the slider 410 and the runner.

Referring to fig. 4, in the embodiment, the first concave portion 131 and the second concave portion 132 and the contour line of the inner circumferential wall 133 are arranged to form an ellipse-like contour line, the central axis of the sliding vane 410 in the radial direction is a 0 ° line, the connection line between the maximum distances of the first concave portion 131 and the second concave portion 132 is the major axis 134 of the ellipse-like contour line, and the connection line perpendicular to the major axis 134 and passing through the center of the shaft hole 130 is the minor axis 135.

Taking first recess 131 as an example, fig. 4 shows a plan view angle, and a counterclockwise direction of crankshaft 600 is taken as a reference direction, an O ° line is taken as an initial position, and an angle by which major axis 134 rotates counterclockwise is an angular position corresponding to a maximum depth of first recess 131. Because the valve seat 111 is opened close to the sliding piece 410 and the valve seat 111 is close to the position between 270 ° and 360 ° in the counterclockwise direction, the flange portions 110 on both sides of the sliding piece 410 are unevenly stressed. In the embodiment shown in FIG. 4, the dashed line within axial bore 130130 is a comparison line 136 of the recess relative to the inner circumferential wall 133 of axial bore 130.

It is understood that, in the embodiment shown in fig. 4, the depths of both sides of the first concave portion 131 in the circumferential direction are smaller, the depth in the middle of the concave portion is larger, the included angle of the maximum depth position of the first concave portion 131 in the radial direction is φ 1, and it is satisfied that 0 ° ≦ φ 1 ≦ 100 °, for example, the maximum depth position of the concave portion may be at the positions corresponding to angles of 20 °, 60 °, 100 ° and the like, so that by properly arranging the positions of the maximum depths of the first concave portions 131 in the circumferential direction, a more stable oil film can be formed in the angle range of 0 ° ≦ φ 1 ≦ 100 °.

It should be noted that, because the first concave portion 131 and the second concave portion 132 are symmetrically disposed, an angle corresponding to the maximum depth of the second concave portion 132 is different from an angle corresponding to the maximum depth of the first concave portion 131 by 180 °, for example, when the angle of the maximum depth position of the first concave portion 131 is 30 °, the angle corresponding to the maximum depth position of the second concave portion 132 is 210 °, which is not described again. The angles of the maximum depth positions of the first concave portion 131 and the second concave portion 132 are set according to actual installation requirements, so that stable bearing capacity generated by symmetrically distributed oil films is guaranteed, the stability of the crankshaft 600 in the radial direction is effectively improved, and the problem of stress difference caused by uneven rigidity of the upper bearing 200 in the circumferential direction due to the arrangement of the valve seat 111 is better solved.

Referring to fig. 4, it can be understood that, in the circumferential direction, a central angle phi 2 corresponds to a line connecting both ends of the first recess 131 and the center of the shaft hole 130, and satisfies 20 ° ≦ phi 2 ≦ 180 °. For example, the central angle corresponding to the first concave portion 131 may be 20 °, 90 °, 180 °, that is, the maximum central angle is 180 °, the specific angle position is adjusted according to the actual product requirement, the central angle corresponding to the second concave portion 132 is consistent with the central angle corresponding to the first concave portion 131, that is, the central angle corresponding to the connection line between the two ends of the second concave portion 132 and the center of the shaft hole 130 is Φ 3, and it is satisfied that Φ 3 is greater than or equal to 20 ° and less than or equal to 180 °, and further description thereof is omitted. By reasonably arranging the angular positions and the central angles of the first concave part 131 and the second concave part 132 in the circumferential direction, the formed oil film is better ensured to have better bearing capacity.

Referring to fig. 6, it should be noted that, when the central angles corresponding to the first concave portion 131 and the second concave portion 132 are all 180 °, the contour lines of the first concave portion 131 and the second concave portion 132 may be defined to form an elliptical contour line, at this time, an included angle of the maximum depth position of the first concave portion 131 in the radial direction shown in fig. 6 is Φ 1, and satisfies that Φ 1 is greater than or equal to 0 ° and less than or equal to 100 °, specifically referring to the embodiment shown in fig. 4, and will not be described herein again.

It should be noted that, in some embodiments, the upper bearing 200 and the lower bearing 300 are both provided with the first concave portion 131 and the second concave portion 132, and at this time, the angular positions, the lengths, the shapes, and the like of the first concave portion 131 and the second concave portion 132 of the upper bearing 200 and the lower bearing 300 need to be consistent. In the upper bearing 200, the height of the first recess 131 and the second recess 132 in the axial direction is equal to the height of the upper bearing 200, and in the lower bearing 300, the height of the first recess 131 and the second recess 132 in the axial direction is equal to the height of the lower bearing 300, which will not be described in detail.

It can be understood that, with respect to the regular circular shaft hole 130, the gap between the crankshaft 600 and the inner peripheral wall 133 of the shaft hole 130 can be changed through the first concave part 131 and the second concave part 132, and stable oil films can be respectively formed between the crankshaft 600 and the upper bearing 200 and between the crankshaft 600 and the lower bearing 300, so that the bearing capacity of the oil films of the upper bearing 200 and the lower bearing 300 is effectively improved, on one hand, the friction between the crankshaft 600 and the shaft hole 130 can be reduced, the friction loss between the bearing 100 and the shaft hole 130 is reduced, the load of the compressor is reduced, the performance of the compressor is improved, and the refrigeration effect is improved; and on the other hand, the stable oil films symmetrically formed on the other side have a bearing effect symmetrical along the radial direction, so that the vibration caused by the bending swing of the rotor assembly 500 is favorably inhibited, the vibration caused by the uneven stress of the flange part 110 along the circumferential direction can be further reduced, the generation of vibration noise is effectively reduced, and the running stability of the compressor is improved.

The embodiment of the invention also provides a refrigeration device (not shown in the attached drawing), wherein the refrigeration device can be an air conditioner, a refrigerator and other household appliances, and the refrigeration device is applied to the compressor of the embodiment. Since the refrigeration equipment adopts all technical solutions of the compressor of the above embodiment, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.