CN108412802B

CN108412802B - Bearing structure and compressor with same

Info

Publication number: CN108412802B
Application number: CN201810452275.7A
Authority: CN
Inventors: 李海; 尤宁; 丁惠文; 吴妙新; 王奇; 蔡卓礼; 王腾飞; 郑方超; 董磊
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2018-05-12
Filing date: 2018-05-12
Publication date: 2024-06-18
Anticipated expiration: 2038-05-12
Also published as: CN108412802A

Abstract

The invention provides a bearing structure and a compressor with the same. The bearing structure includes: the bearing body is provided with a shaft hole, the bearing body is provided with a first end and a second end, a plurality of straight surfaces and a plurality of oil wedge surfaces are arranged on the end face of the first end of the bearing body, the plurality of straight surfaces and the plurality of oil wedge surfaces are alternately arranged along the circumferential direction of the shaft hole, and the height of the oil wedge surfaces in the axial direction of the bearing body is gradually increased along the rotating direction of the rotating shaft. The end face of the bearing body is provided with a straight face and an oil wedge face which are alternately arranged. And the height of the oil wedge surface in the axial direction of the bearing body is gradually increased along the rotation direction of the rotating shaft arranged in the shaft hole. The arrangement can reduce friction damage of the bearing body and the contact of the matched parts, and effectively prolong the service life and improve the reliability of the bearing structure.

Description

Bearing structure and compressor with same

Technical Field

The invention relates to the technical field of compressor equipment, in particular to a bearing structure and a compressor with the same.

Background

At present, large-scale water chiller units are increasingly and widely applied to industries such as plastics, electroplating, electronics, chemical industry, pharmacy, printing, food processing, high-speed rail, subways, markets, hotels and the like and civil fields, a centrifugal compressor is a power source for compressing refrigerants of the water chiller units, and a motor is used as a key component of the centrifugal compressor, so that the reliability is of great importance. The motor bearing is used as a key core part of the centrifugal compressor motor, the reliability of the centrifugal compressor motor is directly affected by the quality of the structure, the size and the quality of the motor bearing, and once the bearing is abnormal, the motor, the centrifugal compressor and a water chilling unit are directly stopped, so that the production and the life of a user and the brand image of a company are seriously affected.

The centrifugal compressor needs to reliably operate under the working conditions of starting and stopping and a plurality of working conditions, including working conditions such as nominal refrigeration, low-temperature refrigeration, low-pressure difference refrigeration, high-pressure difference refrigeration, maximum refrigeration and the like, the bearing of the motor needs to bear radial force and axial force (forwards), and the structure and the size design of the bearing must ensure that the centrifugal compressor can normally work under all working conditions. Some radial bearings are adopted to bear radial force, and thrust bearings bear axial force, so that at least 2 radial bearings and 1 thrust bearing are needed, and the total number of the thrust bearings is 3, and the structure of a sliding bearing lubricating oil path is very complex. Some motor bearings with smooth thrust surfaces are adopted, so that the thickness of an oil film is small, the stability is poor, and the bearings are easy to scratch and wear.

Disclosure of Invention

The invention mainly aims to provide a bearing structure and a compressor with the same, so as to solve the problem that a bearing is easy to wear in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided a bearing structure comprising: the bearing body is provided with a shaft hole, the bearing body is provided with a first end and a second end, a plurality of straight surfaces and a plurality of oil wedge surfaces are arranged on the end face of the first end of the bearing body, the plurality of straight surfaces and the plurality of oil wedge surfaces are alternately arranged along the circumferential direction of the shaft hole, and the height of the oil wedge surfaces in the axial direction of the bearing body is gradually increased along the rotating direction of a rotating shaft arranged in the shaft hole.

Further, an oil groove is arranged between the adjacent oil wedge surface and the straight surface.

Further, an oil discharge port communicated with the oil groove is arranged at the outer edge of the first end of the bearing body.

Further, the width of the oil groove is w1, wherein 2 mm.ltoreq.w1.ltoreq.10mm, and/or the depth of the oil groove is L1, wherein 0.5 mm.ltoreq.L1.ltoreq.3mm.

Further, the width of the oil discharge port is w2, wherein w2 is more than or equal to 0.5mm and less than or equal to 5mm, and/or the depth of the oil discharge port is L1, wherein L2 is more than or equal to 0.5mm and less than or equal to 3mm.

Further, the outer edge of the first end of the bearing body of the part is provided with a sealing oil edge.

Further, the height of the sealing edge is the same as the height of the straight surface adjacent to the sealing edge.

Further, two adjacent oil wedge surfaces and a straight surface form a thrust surface unit, the oil wedge surface is positioned at the front end of the thrust surface unit along the rotation direction of the rotating shaft arranged in the shaft hole, the straight surface is positioned at the tail end of the thrust surface unit, the two adjacent thrust surface units are connected with the oil wedge surface at the front end of the next thrust surface unit through the straight surface at the tail end of the previous thrust surface unit, and an oil groove is formed at the joint of the two adjacent thrust surface units.

Further, the geometric center line of the oil groove in the radial direction is positioned at the joint of two adjacent thrust surface units, and the height difference between the front end of the oil wedge surface and the tail end of the oil wedge surface is L3, wherein L3 is more than or equal to 0.06mm and less than or equal to 0.3mm.

Further, in the thrust surface unit, the ratio of the area of the oil wedge surface to the sum of the areas of the upper oil wedge surface and the straight surface is t, wherein t is more than or equal to 0.5 and less than 1.

Further, the plurality of straight surfaces are located in the same plane in the radial direction of the bearing body.

Further, at least one oil supply hole is formed in the bearing body, extends along the radial direction of the bearing body and is communicated with the shaft hole.

Further, the bearing body includes: the first bearing piece is provided with a first arc-shaped notch; the second bearing piece is provided with a second arc notch, the second bearing piece is detachably connected with the first bearing piece, the first arc notch is matched with the second arc notch to form a shaft hole, and a plurality of straight surfaces and a plurality of oil wedge surfaces are respectively formed on the end surfaces of the first bearing piece and the second bearing piece.

Further, the first bearing member and the second bearing member are provided with a connecting hole, and the first bearing member and the second bearing member are connected through the connecting hole.

Further, one of the first bearing member and the second bearing member is provided with a positioning pin, and the other of the first bearing member and the second bearing member is provided with a positioning hole that mates with the positioning pin.

Further, the hole wall of the shaft hole comprises a first hole wall oil wedge surface, a second hole wall oil wedge surface, a third hole wall oil wedge surface and an arc surface, wherein R1/R is more than or equal to 1 and less than or equal to 1.005,0.001 and less than or equal to 0.01, and L=OO1; o is the axle center of the axle journal; o1 is the axle center of the first hole wall oil wedge surface; r1 is the radius of the oil wedge surface of the first hole wall; r is the radius of the arc surface.

Further, an oil through groove is formed at the starting point of at least one of the first hole wall oil wedge surface, the second hole wall oil wedge surface and the third hole wall oil wedge surface.

Further, the outer diameter of the first end of the bearing body is greater than the outer diameter of the second end of the bearing body.

Further, connecting holes are formed in the straight surface and/or the oil wedge surface.

According to another aspect of the present invention, there is provided a compressor comprising a bearing structure as described above.

By applying the technical scheme of the invention, the end face of the bearing body is provided with the straight face and the oil wedge face which are alternately arranged. And the height of the oil wedge surface in the axial direction of the bearing body is gradually increased along the rotation direction of the rotating shaft. The arrangement can reduce friction damage of the bearing body and the contact of the matched parts, and effectively prolong the service life and improve the reliability of the bearing structure.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

fig. 1 shows a schematic structural view of a first embodiment of a bearing structure according to the invention;

Fig. 2 shows a schematic structural view of a second embodiment of a bearing structure according to the invention;

FIG. 3 shows a schematic cross-sectional structural view of an embodiment of an oil sump and oil wedge of a bearing structure according to the present invention;

Fig. 4 shows a schematic structural view of a shaft hole of an embodiment of a bearing structure according to the present invention.

Wherein the above figures include the following reference numerals:

10. A bearing body; 11. straight surfaces; 12. an oil wedge surface; 13. an oil groove; 14. an oil discharge port; 15. oil through grooves; 16. sealing the oil edges;

20. An oil supply hole;

30. a shaft hole; 31. a first bore wall oil wedge surface; 32. a second bore wall oil wedge surface; 33. a third bore wall oil wedge surface;

40. and a connection hole.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims and drawings of the present application are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, that in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and that identical reference numerals are used to designate identical devices, and thus descriptions thereof will be omitted.

As shown in connection with fig. 1 to 4, a bearing structure is provided according to an embodiment of the present invention.

Specifically, the bearing structure includes a bearing body 10. The bearing body 10 has a shaft hole 30. The bearing body 10 has a first end and a second end, and a plurality of straight surfaces 11 and a plurality of oil wedge surfaces 12 are provided on an end surface of the first end of the bearing body 10, the plurality of straight surfaces 11 and the plurality of oil wedge surfaces are alternately provided along a circumferential direction of the shaft hole, and a height of the oil wedge surfaces in an axial direction of the bearing body 10 is gradually increased along a rotation direction of the rotating shaft provided in the shaft hole 30.

In this embodiment, the end face of the bearing body is provided with straight faces and oil wedge faces alternately arranged. And the height of the oil wedge surface in the axial direction of the bearing body 10 is gradually increased in the rotation direction of the rotation shaft. The arrangement can reduce friction damage of the bearing body and the contact of the matched parts, and effectively prolong the service life and improve the reliability of the bearing structure.

In order to ensure the lubrication of the bearing structure, an oil groove 13 is provided between the adjacent oil wedge surface 12 and the straight surface 11.

The outer edge of the first end of the bearing body 10 is provided with an oil discharge port 14 communicating with the oil groove 13. This arrangement can effectively improve the reliability of the bearing.

To further improve the reliability of the bearing structure, the width of the oil groove 13 is set to w1, wherein 2 mm.ltoreq.w1.ltoreq.10mm, and the depth of the oil groove 13 is L1, wherein 0.5 mm.ltoreq.L1.ltoreq.3mm. The width of the oil discharge port 14 is w2, wherein 0.5 mm.ltoreq.w2.ltoreq.5mm, and/or the depth of the oil discharge port 14 is L1, wherein 0.5 mm.ltoreq.L2.ltoreq.3mm.

The outer edge of the first end of a portion of the bearing body 10 is provided with a sealing rim. Preferably, the height of the selvedge is the same as the height of the straight face 11 adjacent thereto. The arrangement can play a role in stopping lubricating oil through the oil sealing edge, and the capacity of bearing axial force of the bearing structure is improved.

Wherein, two adjacent oil wedge surfaces and straight face form thrust surface unit, along the direction of rotation of the pivot that sets up in the shaft hole, the oil wedge surface is located thrust surface unit's front end, and the straight face is located thrust surface unit's tail end, and two adjacent thrust surface units are connected with the oil wedge surface of the front end of follow-up thrust surface unit through the straight face of the tail end of preceding thrust surface unit, and oil groove 13 has been seted up to the junction of two adjacent thrust surface units. The geometric center line of the oil groove 13 in the radial direction is positioned at the joint of two adjacent thrust surface units, and the height difference between the front end of the oil wedge surface and the tail end of the oil wedge surface is L3, wherein L3 is more than or equal to 0.06mm and less than or equal to 0.3mm.

Further, in the thrust surface unit, the ratio of the area of the oil wedge surface to the sum of the areas of the upper oil wedge surface and the straight surface is t, wherein t is more than or equal to 0.5 and less than 1. The arrangement can play a role in bearing axial force and protecting the bearing structure. The plurality of straight surfaces 11 are located in the same plane in the radial direction of the bearing body 10.

The bearing body 10 is provided with at least one oil supply hole 20, and the oil supply hole 20 extends along the radial direction of the bearing body 10 and is communicated with the shaft hole. The arrangement is convenient to guide external lubricating oil into the shaft hole.

The bearing body 10 includes a first bearing member and a second bearing member. The first bearing member has a first arcuate notch. The second bearing member has a second arc-shaped notch, and the second bearing member is detachably connected with the first bearing member, and the first arc-shaped notch cooperates with the second arc-shaped notch to form a shaft hole, and a plurality of straight surfaces 11 and a plurality of oil wedge surfaces 12 are respectively formed on end surfaces of the first bearing member and the second bearing member. This arrangement can improve the practicality of the bearing structure.

In order to improve the connection reliability of the first bearing member and the second bearing member, the first bearing member and the second bearing member are provided with connection holes through which the first bearing member and the second bearing member are connected.

Further, one of the first bearing member and the second bearing member is provided with a positioning pin, and the other of the first bearing member and the second bearing member is provided with a positioning hole that mates with the positioning pin. This can effectively improve the mounting accuracy of the first bearing member and the second bearing member.

The hole wall of the shaft hole is of a three-wedge surface structure, specifically, the hole wall of the shaft hole comprises a first hole wall oil wedge surface, a second hole wall oil wedge surface 32, a third hole wall oil wedge surface 33 and an arc surface 34 which are connected and surrounded, wherein R1/R1.005,0.001 is more than or equal to 1 and less than or equal to L/R is less than or equal to 0.01, and L=OO1; o is the axle center of the axle journal; o1 is the axle center of the first hole wall oil wedge surface; r1 is the radius of the oil wedge surface of the first hole wall; r is the radius of the arc surface 34.

Preferably, the outer diameter of the first end of the bearing body 10 is greater than the outer diameter of the second end of the bearing body 10. At least one of the straight surface 11 and the oil wedge surface 12 is provided with a connecting hole 40, so that the bearing can be conveniently fixed.

The bearing structure of the above embodiment can also be used in the technical field of compressor equipment, i.e. according to another aspect of the invention, a compressor is provided comprising a bearing structure, which is the bearing structure of the above embodiment.

The bearing structure adopting the structure effectively solves the problem that the bearing structure is complex because at least 2 radial bearings and 1 thrust bearing are required to be used. The problems of small thickness and poor stability of an oil film of a motor bearing with a smooth thrust surface of a bearing structure are solved; the problems of insufficient oil supply, high bearing temperature and uneven temperature of a smooth thrust surface of a bearing structure in the prior art are solved; the problem that a motor bearing thrust surface with a smooth thrust surface of a bearing structure in the prior art is easy to scratch and abrade is solved.

Compared with the adoption of independent radial bearings and thrust bearings, the bearing structure reduces the number of the bearings by 33%, and reduces the complexity of the lubricating oil path structure by more than 33%.

The radial wall surface of the shaft hole adopts a three-oil wedge structure, and the rotating shaft can stably run at high rotating speed. The adoption of the structure relative to the smooth thrust surface structure increases the thickness of an oil film by more than 100%, and is beneficial to the long-term stable operation of the rotor. In the embodiment, an oil wedge surface thrust surface structure is adopted, the utilization rate of lubricating oil is improved by 80%, the oil supply capacity of the thrust surface is improved, and the bearing temperature is reduced. The dirt holding capacity of the bearing is greatly improved, and the problem of scratch and abrasion of the bearing is reduced from 18% to 0%. The radial and thrust structures are integrated on the same motor bearing, so that the number of the bearings is reduced, and the shafting structure and the lubricating oil path structure of the centrifugal compressor are simplified.

Preferably, the thrust surfaces of the oil wedge surfaces are respectively provided with 6-20 oil wedge surfaces, the depth of the oil wedge is 0.06-0.30mm, the convergence direction of the oil wedge surfaces is the same as the rotation direction of the rotor, the oil sealing edges are radially arranged on the oil wedge surfaces, the height of the oil sealing edges is the same as the plane height of the thrust surfaces, an oil groove is arranged in front of each oil wedge surface, and the radial end surface of each oil groove is provided with an oil discharge port, so that the thickness of a bearing oil film is increased, the temperature of the bearing is reduced, the dirt holding capacity is improved, the rotor can stably run for a long time, and the bearing is not easy to scratch and wear.

In this embodiment, the bearing structure may be used in a motor of a compressor, that is, the bearing structure is a motor sliding bearing, and the bearing may be a unitary structure, wherein 2 oil supply holes may be provided on the bearing body. The oil supply hole penetrates through the radial surface from the outer circle of the bearing, and the aperture of the oil supply hole is formed inAnd thus, sufficient lubricating oil is ensured to enter the gap between the bearing and the journal from the external oil path through the oil supply hole.

The radial surface of the motor sliding bearing is of a three-oil-wedge structure, the radius of the arc surface 34 is R, the axle center of the axle journal is O, the radius of the first hole wall oil wedge surface 31 is R1, the axle center is O1, the radius of the second hole wall oil wedge surface 32 is R2, the axle center is O2, the radius of the third hole wall oil wedge surface 33 is R3, the axle center is O3, and the eccentricity formed by the distance between the axle center of the axle journal and the axle center of the oil wedge is L. Taking the oil wedge surface as an example, L=OO1, R1/R is between 1 and 1.005, and L/R is between 0.001 and 0.01. The three-oil wedge structure can enable the rotating shaft to stably operate at a high rotating speed.

The oil passage groove 15 is provided at the start point of at least one of the first, second, and third bore wall oil wedge surfaces 31, 32, 33. The cross section of the oil passing groove 15 can be an arc oil groove or a V-shaped oil groove, namely, the arc oil groove or the V-shaped oil groove is processed at the starting point of the convergence surface of each oil wedge surface of the radial surface, the oil groove axially penetrates to the end surface of the bearing from the oil wedge surface, the depth of the oil groove is between 0.5mm and 5mm, and the width of the oil groove is between 0.5mm and 50mm, so that a certain oil storage capacity is ensured in the radial direction, and lubricating oil can smoothly enter the oil wedge surface after passing through the radial surface.

The oil wedge surfaces are uniformly distributed by 6-20, the depth of the oil wedge surfaces is between 0.06-0.30mm, the oil wedge surfaces are inclined planes, the oil wedge surfaces occupy between 0.5-1, the convergence direction of the oil wedge surfaces is the same as the rotation direction of the rotor, the oil sealing edges are radially arranged on the oil wedge surfaces, and the height of the oil sealing edges is the same as that of the straight surfaces. In this embodiment, screws are used to fix the entire combination bearing to the bearing support of the centrifugal compressor through screw holes.

The bearing structure may be provided as a separate structure, i.e. comprising a first bearing member and a second bearing member, which in this example are fixed as one piece by adding cylindrical pins, screws, the remaining structure, dimensions being the same as in the preferred embodiment described above.

The number of the oil wedge surfaces of the three-oil-wedge structure can be set to be other numbers of the oil wedge structures, and the other structures and the sizes are the same as those of the optimal implementation mode. The anticlockwise rotation of the rotation shaft in the embodiment can be changed into clockwise rotation, the convergence direction of the oil wedge is the same as the rotation direction of the rotor, as shown in f in the figure, the other structures and the dimensions are the same as the optimal embodiment, f1 is the front end of the oil wedge surface, and f2 is the tail end of the oil wedge surface. .

In addition to the foregoing, references in the specification to "one embodiment," "another embodiment," "an embodiment," etc., indicate that the particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application, as generally described. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is intended that such feature, structure, or characteristic be implemented within the scope of the application.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A bearing structure, comprising:

The bearing comprises a bearing body (10), wherein the bearing body (10) is provided with a shaft hole, the bearing body (10) is provided with a first end and a second end, a plurality of straight surfaces (11) and a plurality of oil wedge surfaces (12) are arranged on the end face of the first end of the bearing body (10), the plurality of straight surfaces (11) and the plurality of oil wedge surfaces are alternately arranged along the circumferential direction of the shaft hole, and the height of the oil wedge surfaces in the axial direction of the bearing body (10) is gradually increased along the rotation direction of a rotating shaft arranged in the shaft hole; the bearing body (10) comprises:

A first bearing member having a first arcuate cutout;

The second bearing piece is provided with a second arc-shaped notch, the second bearing piece is detachably connected with the first bearing piece, the first arc-shaped notch is matched with the second arc-shaped notch to form the shaft hole, and a plurality of straight surfaces (11) and a plurality of oil wedge surfaces (12) are respectively formed on the end surfaces of the first bearing piece and the second bearing piece;

The first bearing piece and the second bearing piece are provided with connecting holes, and the first bearing piece and the second bearing piece are connected through the connecting holes;

The hole wall of the shaft hole comprises a first hole wall oil wedge surface (31), a second hole wall oil wedge surface (32), a third hole wall oil wedge surface (33) and an arc surface (34), wherein the arc surface (34) is arranged between the first hole wall oil wedge surface (31) and the second hole wall oil wedge surface (32), the arc surface (34) is respectively arranged between the second hole wall oil wedge surface (32) and the third hole wall oil wedge surface (33), the arc surface (34) is respectively arranged between the third hole wall oil wedge surface (33) and the first hole wall oil wedge surface (31),

1≤R1/R≤1.005，0.001≤L/R≤0.01，L =OO1；

O is the axle center of the axle journal;

o1 is the axle center of the first hole wall oil wedge surface (31);

R1 is the radius of the first hole wall oil wedge surface (31);

r is the radius of the arc surface (34);

An oil through groove (15) is formed at the starting point of at least one of the first hole wall oil wedge surface (31), the second hole wall oil wedge surface (32) and the third hole wall oil wedge surface (33).

2. Bearing structure according to claim 1, characterized in that an oil groove (13) is provided between the adjacent oil wedge surface (12) and the straight surface (11).

3. Bearing arrangement according to claim 2, characterized in that the outer edge of the first end of the bearing body (10) is provided with a discharge opening (14) communicating with the oil sump (13).

4. A bearing structure according to claim 2, wherein,

The width of the oil groove (13) is w1, wherein, the width of the oil groove is more than or equal to 2mm and less than or equal to w1 and less than or equal to 10mm, and/or

The depth of the oil groove (13) is L1, wherein L1 is more than or equal to 0.5mm and less than or equal to 3mm.

5. A bearing structure according to claim 3, wherein,

The width of the oil discharge opening (14) is w2, wherein w2 is more than or equal to 0.5mm and less than or equal to 5mm, and/or

The depth of the oil discharge port (14) is L1, wherein L2 is more than or equal to 0.5mm and less than or equal to 3mm.

6. A bearing arrangement according to claim 3, characterized in that the outer edge of the first end of a part of the bearing body (10) is provided with a sealing rim.

7. Bearing structure according to claim 6, characterized in that the height of the sealing edge is the same as the height of the straight face (11) adjacent thereto.

8. Bearing structure according to claim 2, characterized in that one of the oil wedge surfaces forms a thrust surface unit with an adjacent one of the straight surfaces, the oil wedge surface being located at the front end of the thrust surface unit and the straight surface being located at the rear end of the thrust surface unit in the direction of rotation of the shaft provided in the shaft hole, the adjacent two of the thrust surface units being connected to the oil wedge surface at the front end of the latter thrust surface unit by the straight surface at the rear end of the former thrust surface unit, the junction of the adjacent two of the thrust surface units being provided with the oil groove (13).

9. Bearing structure according to claim 8, wherein the geometrical centre line of the oil groove (13) in radial direction is located at the junction of two adjacent thrust surface units, the difference in height between the leading end of the oil wedge surface and the trailing end of the oil wedge surface being L3, wherein 0.06mm +.l3 +.0.3 mm.

10. The bearing structure according to claim 8, wherein in the thrust face unit, a ratio of an area of the oil wedge face to a sum of areas of the oil wedge face and the straight face is t, wherein 0.5.ltoreq.t < 1.

11. Bearing arrangement according to claim 1, characterized in that a plurality of said straight faces (11) lie in the same plane in the radial direction of the bearing body (10).

12. Bearing structure according to claim 1, characterized in that the bearing body (10) is provided with at least one oil supply hole (20), which oil supply hole (20) extends in the radial direction of the bearing body (10) and communicates with the shaft hole.

13. The bearing structure of claim 1, wherein one of the first bearing member and the second bearing member is provided with a locating pin, and the other of the first bearing member and the second bearing member is provided with a locating hole that mates with the locating pin.

14. Bearing structure according to claim 1, characterized in that the outer diameter of the first end of the bearing body (10) is larger than the outer diameter of the second end of the bearing body (10).

15. Bearing structure according to claim 1, characterized in that the straight surface (11) and/or the oil wedge surface (12) are provided with connecting holes (40).

16. A compressor comprising a bearing arrangement, characterized in that the bearing arrangement is as claimed in any one of claims 1 to 15.