CN217107867U - Bearing structure and water chilling unit - Google Patents
Bearing structure and water chilling unit Download PDFInfo
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- CN217107867U CN217107867U CN202122995617.XU CN202122995617U CN217107867U CN 217107867 U CN217107867 U CN 217107867U CN 202122995617 U CN202122995617 U CN 202122995617U CN 217107867 U CN217107867 U CN 217107867U
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Abstract
The utility model provides a bearing structure and cooling water set, the bearing structure includes the bearing body that has the dead eye, and the internal face of dead eye is provided with a plurality of bar grooves that set up along the circumference interval of dead eye, and the both ends of each bar groove are first end and second end respectively and extend the setting towards the both ends of dead eye respectively; the second end of each strip-shaped groove is deviated from the first end thereof by a predetermined angle in the circumferential direction of the bearing hole. Through setting up a plurality of bar grooves to the liquid film structure that forms when making the bearing structure of this application adopt refrigerant lubrication bearing is more stable, has solved the problem that the liquid film that refrigerant lubrication bearing among the prior art formed is easy to break.
Description
Technical Field
The utility model relates to a bearing technical field particularly, relates to a bearing structure and cooling water set.
Background
At present, an oil lubrication bearing is dominant in a centrifugal water chilling unit, but due to the existence of lubricating oil, an oil lubrication system for supplying and returning oil and an oil separation system are required to be considered in the design of the water chilling unit, so that the complexity of design, manufacture, maintenance and control is increased, huge initial cost and operation and maintenance cost are increased, and environmental pollution is caused by the leakage of the lubricating oil; meanwhile, lubricating oil enters the evaporator and the condenser along with the refrigerant, the heat exchange effect and the system energy efficiency are influenced, and the performance of the unit is degraded after long-term operation, so that the oil-free centrifugal water chilling unit is the development direction of the centrifugal water chilling unit.
At present, oilless is mainly developed in three development directions of an air bearing, a magnetic suspension bearing and a refrigerant lubrication bearing, and the air bearing is only suitable for a small-cooling-capacity unit due to the characteristic of high speed and light load; the magnetic suspension bearing has a plurality of sensors and a complex control system, so that the problem of reliability of the unit during sudden power failure cannot be completely solved; the refrigerant bearing scheme realizes the oilless effect of the water chilling unit by adopting the pure refrigerant to lubricate the bearing, improves the energy efficiency of the water chilling unit, greatly simplifies the system design, reduces the manufacturing and maintenance cost of the system, and eliminates the environmental problems caused by lubricating oil.
The refrigerant lubrication bearing forms a liquid film according to fluid dynamic pressure, namely, the refrigerant on the friction surface is brought into the wedge-shaped clearance to form a high-pressure water film by means of high-speed relative motion between the shaft and the bearing, so that the shaft and the two friction surfaces of the bearing are separated, and the abrasion of the bearing is reduced. However, since the refrigerant has a great difference in physical properties from the conventional lubricating oil, the refrigerant has the characteristics of low viscosity, poor lubricity, volatility and the like, so that when the refrigerant is used for lubrication, a refrigerant liquid film formed between bearing gaps is very thin and easily breaks, abrasion of a sliding bearing is very easily caused, the service life of the sliding bearing is very long, and great difficulty is brought to design and development of a centrifugal chiller.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a bearing structure and a water chiller to solve the problem of easy breakage of the liquid film formed by the refrigerant lubrication bearing in the prior art.
In order to achieve the above object, according to an aspect of the present invention, a bearing structure is provided, which includes a bearing body having a bearing hole, wherein a plurality of strip-shaped grooves are formed on an inner wall surface of the bearing hole at intervals along a circumferential direction of the bearing hole, and two ends of each strip-shaped groove are respectively a first end and a second end and respectively extend toward two ends of the bearing hole; the second end of each strip-shaped groove is deviated from the first end thereof by a predetermined angle in the circumferential direction of the bearing hole.
Furthermore, the second ends of the strip-shaped grooves deviate along the clockwise direction or deviate along the anticlockwise direction; and/or two ends of each strip-shaped groove respectively extend to two end faces of the bearing hole; and/or the number of the strip-shaped grooves is even.
Furthermore, each strip-shaped groove is provided with a longitudinal section perpendicular to the extending direction of the strip-shaped groove, and the shape of the longitudinal section is any one of trapezoid, rectangle and triangle; or the outer periphery of the longitudinal section is a part of a predetermined circle; or the outer periphery of the longitudinal section is a part of a predetermined ellipse.
Furthermore, each strip-shaped groove extends along a preset curve or a preset straight line, and the preset curve is a smooth curve; the value range of the preset angle is 20 degrees to 40 degrees; and/or the length of the bearing body along the axial direction is L, the bore diameter of the bearing hole is D, the length-diameter ratio is L/D, and the value range of the length-diameter ratio is 1.8-2.
Furthermore, each strip-shaped groove extends along a preset curve, the preset curve comprises a first smooth curve section, a second line section and a third smooth curve section which are connected in sequence, and the second line section is a smooth curve section or a straight line section; the first smooth curved section is provided with a connecting end connected with the second line section and a free end far away from the second line section, the free end of the first smooth curved section forms a first end of the strip-shaped groove, the connecting end of the first smooth curved section deviates from the free end of the first smooth curved section along the circumferential direction of the bearing hole by a first set angle, the first set angle is an acute angle, and the deviation direction of the connecting end of the first smooth curved section is the same as the deviation direction of the second end of the strip-shaped groove; and/or the second line segment is provided with a first end connected with the first smooth curve segment and a second end far away from the first smooth curve segment, the second end of the second line segment deviates from the first end by a second set angle relative to the circumferential direction of the bearing hole, the second set angle is an acute angle, and the deviation direction of the second end of the second line segment is the same as the deviation direction of the second end of the strip-shaped groove; and/or the third circular smooth curve section is provided with a connecting end connected with the second line section and a free end far away from the second line section, the free end of the third circular smooth curve section forms a second end of the strip-shaped groove, the free end of the third circular smooth curve section deviates from the connecting end of the third circular smooth curve section by a third set angle relative to the circumferential direction of the bearing hole, the third set angle is an acute angle, and the deviation direction of the free end of the third circular smooth curve section relative to the connecting end of the third circular smooth curve section is the same as the deviation direction of the second end of the strip-shaped groove relative to the first end of the strip-shaped groove.
Further, the value range of the first set angle is 25 degrees to 50 degrees; and/or the value range of the second set angle is 15 degrees to 25 degrees; and/or the value range of the third set angle is 25 degrees to 50 degrees; and/or a length between the connecting end and the free end of the first rounded curvilinear section in the axial direction of the bearing body is 1/6 of a length of the bearing body in the axial direction thereof; and/or the length in the axial direction of the bearing body between the connecting end and the free end of the third smooth curved section is 1/6 the length in the axial direction of the bearing body; and/or the length of the bearing body along the axial direction is L, the bore diameter of the bearing hole is D, the length-diameter ratio is L/D, and the value range of the length-diameter ratio is 1.8-2.
Furthermore, the radius of the hole of the bearing hole is R, the radius of the rotating shaft arranged in the bearing hole is R, and the radius gap delta is R-R; the distance between the hole center line of the bearing hole and the central axis of the rotating shaft is an eccentricity, the eccentricity is the ratio of the eccentricity to the radius clearance, and the value range of the eccentricity is 0.5-0.8; and/or the relative clearance is C ═ R/R, where C ranges from 0.5% to 2%.
Furthermore, a plurality of annular grooves are formed in the outer wall surface of the bearing body at intervals along the axial direction of the bearing body, and elastic rings are arranged in the annular grooves; and/or the bearing body is made of silicon nitride ceramic material; and/or the inner wall surface of the bearing hole is provided with a solid lubricating layer.
Further, the material composition of the solid lubricating layer comprises polytetrafluoroethylene, graphite, a binder and molybdenum disulfide; wherein, the content of the polytetrafluoroethylene is 10 to 20 percent, the content of the graphite is 5 to 10 percent, and the content of the binder is 1 to 3 percent; the granularity of the molybdenum disulfide is less than 10 mu m; and/or the thickness of the solid lubricating layer is greater than 0.5 mm.
According to another aspect of the present invention, there is provided a water chiller, which includes a compressor, the compressor including the above-mentioned bearing structure.
By applying the technical scheme of the utility model, the bearing structure comprises a bearing body with a bearing hole, the inner wall surface of the bearing hole is provided with a plurality of strip-shaped grooves which are arranged along the circumferential interval of the bearing hole, and the two ends of each strip-shaped groove are respectively a first end and a second end and are respectively extended towards the two ends of the bearing hole; the second end of each strip-shaped groove is deviated from the first end thereof by a predetermined angle in the circumferential direction of the bearing hole. Through setting up a plurality of bar grooves to the liquid film structure that forms when making the bearing structure of this application adopt refrigerant lubrication bearing is more stable, has solved the easy cracked problem of liquid film that the refrigerant lubrication bearing among the prior art formed.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a schematic structural view of a first embodiment of a bearing body of a bearing structure according to the invention;
FIG. 2 shows a side view block diagram of a bearing body of the bearing structure of FIG. 1;
fig. 3 shows a schematic structural view of a second embodiment of a bearing body of a bearing structure according to the invention;
FIG. 4 shows a side view block diagram of a bearing body of the bearing structure of FIG. 3;
fig. 5 shows a schematic structural view of a third embodiment of a bearing body of a bearing structure according to the invention;
fig. 6 shows a schematic structural view of a fourth embodiment of a bearing body of a bearing structure according to the invention;
FIG. 7 shows a side view block diagram of a bearing body of the bearing structure of FIG. 6;
fig. 8 shows a schematic structural view of a fifth embodiment of a bearing body of a bearing structure according to the invention;
fig. 9 shows a schematic view of a matching structure of a bearing structure and a rotating shaft according to the present invention;
fig. 10 shows a schematic view of the eccentricity between the bearing hole and the rotation shaft of the bearing structure according to the present invention;
fig. 11 shows a schematic structural view of an elastic ring arranged on a bearing body according to the present invention.
Wherein the figures include the following reference numerals:
10. a bearing body; 11. a bearing bore; 12. a strip-shaped groove; 121. a first groove section; 122. a second groove section; 123. a third groove section; 13. a solid lubricating layer; 14. an elastic ring; 20. a rotating shaft.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
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 example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The utility model provides a bearing structure, please refer to fig. 1 to 11, the bearing structure includes a bearing body 10 having a bearing hole 11, an inner wall surface of the bearing hole 11 is provided with a plurality of strip-shaped grooves 12 arranged along a circumferential direction of the bearing hole 11 at intervals, two ends of each strip-shaped groove 12 are respectively a first end and a second end and are respectively extended towards two ends of the bearing hole 11; the second end of each strip-shaped groove 12 is deviated from the first end thereof by a predetermined angle in the circumferential direction of the bearing hole 11. Through setting up a plurality of bar grooves 12 to make the bearing arrangement of this application adopt the refrigerant lubricated bearing formed liquid film structure relatively stable, solved the problem that the liquid film that the refrigerant lubricated bearing among the prior art formed is fragile.
Compare the straight flute structure that ordinary axial extension along dead eye 11 set up, the bearing body 10 that has bar groove 12 of this application can possess better heat radiation characteristic when guaranteeing that the bearing capacity is higher, has avoided the refrigerant to influence the liquid film stability because the high gasification of temperature, and the structure of this application bar groove 12 is favorable to the refrigerant to discharge from bar groove 12.
Specifically, the predetermined angle is an acute angle.
Specifically, the second ends of the plurality of bar-shaped grooves 12 are all deviated in the clockwise direction or are all deviated in the counterclockwise direction.
Specifically, both ends of each strip-shaped groove 12 extend to both end faces of the bearing hole 11, respectively.
In the present embodiment, the number of the stripe grooves 12 is an even number, for example, the number of the stripe grooves 12 is 4, or 6, or 8, and the number of the stripe grooves 12 is 6 is the most preferable case.
In the present embodiment, each strip-shaped groove 12 has a longitudinal section perpendicular to its extension, the first arrangement of the longitudinal section being: as shown in fig. 1 to 5, the longitudinal section has any one of a trapezoidal, rectangular, and triangular shape; when the shape of the longitudinal section is triangular, the shape of the longitudinal section can be preferably isosceles triangle; a second arrangement of the longitudinal section is: the outer periphery of the longitudinal section is a part of a predetermined circle, and the outer periphery of the longitudinal section is preferably a semicircle; a third arrangement of the longitudinal section is: as shown in fig. 6 and 7, the outer periphery of the longitudinal section is a part of a predetermined ellipse, and the outer periphery of the longitudinal section is preferably a half ellipse.
In the specific implementation process, when the shape of the longitudinal section of the strip-shaped groove 12 is an isosceles triangle, the bearing capacity and the lubrication performance of the bearing body 10 are the highest, and secondly, when the shape of the longitudinal section of the strip-shaped groove 12 is a semi-ellipse and when the shape of the longitudinal section of the strip-shaped groove 12 is a trapezoid, and thirdly, when the shape of the longitudinal section of the strip-shaped groove 12 is a rectangle.
In the present embodiment, the first structural form of the strip-shaped groove 12 is: each strip-shaped groove 12 extends along a predetermined curve or a predetermined straight line, the predetermined curve is a smooth curve, and the predetermined curve is preferably an arc line; the predetermined angle ranges from 20 degrees to 40 degrees.
It was found that the liquid film pressure at the intermediate position is the largest in the axial direction of the bearing body 10, the liquid film between the 1/6 position from the end of the bearing body 10 and the intermediate position does not vary much, and the liquid film pressure between the 1/6 position from the end of the bearing body 10 and the end of the bearing body 10 rapidly decreases; therefore, in this embodiment, the second structural form of the strip-shaped groove 12 is: as shown in fig. 8, each strip-shaped groove 12 extends along a predetermined curve, the predetermined curve includes a first smooth curve section, a second line section and a third smooth curve section which are connected in sequence, and the second line section is a smooth curve section or a straight line section; the strip-shaped groove 12 includes a first groove segment 121, a second groove segment 122, and a third groove segment 123 connected in sequence, where the first groove segment 121, the second groove segment 122, and the third groove segment 123 are respectively disposed in one-to-one correspondence with the first smooth curve segment, the second line segment, and the third smooth curve segment, that is, the first groove segment 121 extends along the first smooth curve segment, the second groove segment 122 extends along the second line segment, and the third groove segment 123 extends along the third smooth curve segment.
Optionally, the first smooth curve segment is an arc segment, and the third smooth curve segment is an arc segment; when the second line segment is a smooth curved line segment, the second line segment is preferably an arc line segment.
Specifically, the first smooth curved section has a connecting end connected with the second line section and a free end far away from the second line section, the free end of the first smooth curved section forms a first end of the strip-shaped groove 12, the connecting end of the first smooth curved section deviates from the free end of the first smooth curved section by a first set angle along the circumferential direction of the bearing hole 11, the first set angle is an acute angle, and the deviation direction of the connecting end of the first smooth curved section is the same as the deviation direction of the second end of the strip-shaped groove 12; optionally, the first setting angle is in a range of 25 degrees to 50 degrees.
Specifically, the second line segment has a first end connected with the first smooth curved segment and a second end far away from the first smooth curved segment, the second end of the second line segment deviates from the first end by a second set angle in the circumferential direction of the bearing hole 11, the second set angle is an acute angle, and the deviation direction of the second end of the second line segment is the same as the deviation direction of the second end of the strip-shaped groove 12; optionally, the second setting angle is in a range of 15 degrees to 25 degrees.
Specifically, the third circular smooth curve segment has a connecting end connected with the second line segment and a free end far away from the second line segment, the free end of the third circular smooth curve segment forms a second end of the strip-shaped groove 12, the free end of the third circular smooth curve segment deviates from the connecting end of the third circular smooth curve segment by a third set angle along the circumferential direction of the bearing hole 11, the third set angle is an acute angle, and the deviation direction of the free end of the third circular smooth curve segment from the connecting end of the third circular smooth curve segment is the same as the deviation direction of the second end of the strip-shaped groove 12 from the first end of the strip-shaped groove; optionally, the third setting angle is in a range of 25 degrees to 50 degrees.
Specifically, the length in the axial direction of the bearing body 10 between the connection end and the free end of the first rounded curved section is 1/6 of the length in the axial direction of the bearing body 10, and the length in the axial direction of the bearing body 10 between the connection end and the free end of the third rounded curved section is 1/6 of the length in the axial direction of the bearing body 10.
For the structural arrangement of the strip-shaped groove 12 of the second structural form, the torsion angle of the second groove section 122 is smaller, the length of the strip-shaped groove 12 along the extending direction thereof is smaller, so that the contact line between the strip-shaped groove 12 and the rotating shaft in the bearing hole 11 along the extending direction of the strip-shaped groove 12 is shorter, the contact area between the strip-shaped groove 12 and the rotating shaft in the bearing hole 11 is smaller, and further, under the condition that the axial length and the radius of the bearing hole 11 are constant values, the contact area between the hole wall of the bearing hole 11 (the wall surface left after removing the strip-shaped groove 12) and the rotating shaft is larger, and the contact area between the hole wall and the rotating shaft is in direct proportion to the bearing capacity of the bearing, that is, the larger the bearing capacity is, so that the bearing body 10 has higher bearing capacity by making the torsion angle of the second groove section 122 smaller; meanwhile, because the torsion angle of the first groove section 121 and the third groove section 123 is large, the length of the strip-shaped groove 12 in the extending direction thereof is long, the contact line of the rotating shaft in the strip-shaped groove 12 and the bearing hole 11 in the extending direction of the strip-shaped groove 12 is long, the contact area of the rotating shaft in the strip-shaped groove 12 and the bearing hole 11 is large, the heat dissipation area of the bearing body 10 is large, and the heat dissipation characteristic is enhanced.
When the rotating shaft rotates, a convergent wedge, namely a dynamic pressure lubricating film is formed between the bearing and the rotating shaft so as to support the force applied on the rotating shaft, and the bearing capacity of the bearing is relatively low because the lubricating liquid film which can be formed in the gap of the bearing is relatively thin due to the low viscosity of the refrigerant relative to the refrigeration oil; in addition, the refrigerant is easy to gasify when heated or the pressure is reduced, the dynamic pressure effect disappears in a liquid film diffusion area, when the pressure is lower than the gasification pressure of the refrigerant or the refrigerant absorbs more heat, the refrigerant liquid film can generate cavitation phenomenon, namely gasification, the cavitation can erode the surface of a rotating shaft, the lubricating property is poor, the vibration of the rotating shaft is caused, and the shafting stability is poor, so that the refrigerant bearing is required to have good heat dissipation property.
The main parameters influencing the bearing capacity W of the water lubrication sliding bearing comprise the length-diameter ratio L/D of the bearing, the relative clearance C of the bearing and the eccentricity x of the bearing; as shown in fig. 9 to 11, the length of the bearing body 10 along the axial direction thereof is L, the bore diameter of the bearing bore 11 is D, and the length-diameter ratio is L/D; the bore radius of the bearing bore 11 is R, the radius of the rotating shaft 20 disposed in the bearing bore 11 is R, and the radius gap δ is R-R, that is, δ is R-R; center line P of bearing hole 11 1 And a central axis P of the rotary shaft 20 2 Parallel to each other, the center line P of the bearing hole 11 1 And a central axis P of the rotary shaft 20 2 The distance between the two is eccentricity e, eccentricityx is the ratio of the eccentricity e to the radius gap delta, namely x is e/delta; c ═ R (R-R)/R.
In this embodiment, the eccentricity x ranges from 0.5 to 0.8, and the C ranges from 0.5% to 2%; when each strip-shaped groove 12 is in the first structural form, the length-diameter ratio ranges from 1.8 to 2; when each strip-shaped groove 12 is in the second structural form, the length-diameter ratio ranges from 1.8 to 2, so that the bearing structure has relatively high bearing capacity and good heat dissipation property.
Since the refrigerant lubrication bearing clearance (clearance between the bearing and the shaft when the shaft in the bearing hole 11 rotates) is only ten or more micrometers, and the bearing body 10 is required to have good elasticity and vibration absorption, as shown in fig. 11, the outer wall surface of the bearing body 10 is provided with a plurality of annular grooves arranged at intervals in the axial direction of the bearing body 10, and the annular grooves are provided with elastic rings 14; because the lubricating oil film is arranged between the hole wall of the bearing hole 11 and the rotating shaft 20, the lubricating oil film can generate certain pressure on the bearing body 10, the bearing body 10 can float under the action of the pressure, the elastic ring 14 is arranged to adapt to the floating of the bearing body 10, and the pressure generated by the lubricating oil film on the bearing body 10 is absorbed (namely, the elastic ring 14 has vibration absorption performance), so that the bearing body 10 can be automatically adjusted under the elastic action of the elastic ring 14 when in work, the lubricating oil film forming is facilitated, the shafting vibration is reduced, and the shafting stability is improved.
Specifically, the elastic ring 14 is a gray ring, or the elastic ring 14 is made of teflon.
Since the viscosity of the refrigerant is low, a lubricating liquid film capable of being formed in the bearing gap is thin and is easy to break, which requires a bearing structure to have good self-lubricating performance, the bearing body 10 uses silicon nitride (Si) 3 N 4 ) The ceramic material, silicon nitride ceramic material has the advantages of high temperature resistance, corrosion resistance, high specific strength, good wear resistance, small thermal expansion coefficient and the like.
Because the silicon nitride ceramic material has high brittleness and poor embedding performance on abrasive particles, the abrasion resistance of the bearing body 10 on the abrasive particles is weak, and the solid lubricating layer 13 is arranged on the inner wall surface of the bearing hole 11 of the bearing body 10, so that the self-lubricating performance of the bearing structure is realized. Optionally, the solid lubrication layer 13 is a plating layer.
In particular, molybdenum disulfide (MoS) 2 ) Because weak van der waals force exists between the layers, when external force is applied, slippage is easy to occur between the layers, so that the lubricating oil is beneficial to lubrication of the layers, and the lubricating oil has excellent lubricating performance particularly under the conditions of high temperature, low temperature, high load, high rotating speed and ultra-vacuum; research shows that the wear resistance and wear resistance of the molybdenum disulfide added with polytetrafluoroethylene and graphite are better, so that the material components of the solid lubricating layer 13 comprise polytetrafluoroethylene, graphite, a binder and molybdenum disulfide, the value range of the content of the polytetrafluoroethylene is 10% -20%, the value range of the content of the graphite is 5% -10%, the value range of the content of the binder is 1% -3%, and the balance is molybdenum disulfide, so that the bearing body 10 is suitable for the environment of a centrifugal refrigeration compressor under high temperature and high pressure.
Specifically, the granularity of the molybdenum disulfide is less than 10 μm, the thickness of the solid lubrication layer 13 is greater than 0.5mm, the solid lubrication layer 13 has high compressive strength, good wear resistance, strong adhesiveness and lower friction factor, has better film forming structural characteristics, can generate a film with good stability under high pressure, further prevents the bearing body 10 from failing due to the breakage of a liquid film, and further improves the stability of a shafting and prolongs the service life of the bearing.
The bearing structure of the application has the following advantages: 1. the self-lubricating property is good, the bearing abrasion is small, and the service life is long; 2. the bearing has high bearing capacity; 3. the bearing has good damping characteristic; 4. the bearing has good heat dissipation property.
The utility model also provides a cooling water set, it includes the compressor, and the compressor includes foretell bearing arrangement.
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:
in the bearing structure of the present invention, the bearing structure includes a bearing body 10 having a bearing hole 11, the inner wall surface of the bearing hole 11 is provided with a plurality of bar-shaped grooves 12 arranged along the circumferential direction of the bearing hole 11 at intervals, and both ends of each bar-shaped groove 12 are respectively a first end and a second end and are respectively extended toward both ends of the bearing hole 11; the second end of each strip-shaped groove 12 is deviated from the first end thereof by a predetermined angle in the circumferential direction of the bearing hole 11. Through setting up a plurality of bar grooves 12 to make the bearing arrangement of this application adopt the refrigerant lubricated bearing formed liquid film structure relatively stable, solved the problem that the liquid film that the refrigerant lubricated bearing among the prior art formed is fragile.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is 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 … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship 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 of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The bearing structure is characterized by comprising a bearing body (10) with a bearing hole (11), wherein a plurality of strip-shaped grooves (12) are formed in the inner wall surface of the bearing hole (11) and are arranged at intervals along the circumferential direction of the bearing hole (11), and the two ends of each strip-shaped groove (12) are respectively a first end and a second end and are respectively arranged in an extending mode towards the two ends of the bearing hole (11); the second end of each of the strip-shaped grooves (12) is deviated from the first end thereof by a predetermined angle in the circumferential direction of the bearing hole (11).
2. The bearing structure according to claim 1,
the second ends of the strip-shaped grooves (12) deviate along the clockwise direction or deviate along the anticlockwise direction; and/or
Two ends of each strip-shaped groove (12) respectively extend to two end faces of the bearing hole (11); and/or
The number of the strip-shaped grooves (12) is even.
3. Bearing structure according to claim 1, characterized in that each of said strip-shaped grooves (12) has a longitudinal section perpendicular to its extension,
the shape of the longitudinal section is any one of trapezoid, rectangle and triangle; or
The outer periphery of the longitudinal cross section is a part of a predetermined circle; or
The outer periphery of the longitudinal cross-section is a portion of a predetermined ellipse.
4. A bearing construction according to claim 3, wherein each of said strip-shaped grooves (12) extends along a predetermined curve or a predetermined straight line, said predetermined curve being a rounded curve;
the value range of the preset angle is 20-40 degrees; and/or
The bearing comprises a bearing body (10), wherein the length of the bearing body (10) in the axial direction is L, the inner diameter of a bearing hole (11) is D, the length-diameter ratio is L/D, and the value range of the length-diameter ratio is 1.8-2.
5. The bearing structure according to claim 2, wherein each of the strip-shaped grooves (12) extends along a predetermined curve, the predetermined curve comprises a first smooth curve section, a second line section and a third smooth curve section which are connected in sequence, and the second line section is a smooth curve section or a straight line section;
the first smooth curved section is provided with a connecting end connected with the second line section and a free end far away from the second line section, the free end of the first smooth curved section forms a first end of the strip-shaped groove (12), the connecting end of the first smooth curved section deviates from the free end of the first smooth curved section along the circumferential direction of the bearing hole (11) by a first set angle, the first set angle is an acute angle, and the deviation direction of the connecting end of the first smooth curved section is the same as that of the second end of the strip-shaped groove (12); and/or
The second line segment is provided with a first end connected with the first smooth curved segment and a second end far away from the first smooth curved segment, the second end of the second line segment deviates from the first end of the second line segment by a second set angle along the circumferential direction of the bearing hole (11), the second set angle is an acute angle, and the deviation direction of the second end of the second line segment is the same as the deviation direction of the second end of the strip-shaped groove (12); and/or
The third smooth curve section is provided with a connecting end connected with the second line section and a free end far away from the second line section, the free end of the third smooth curve section forms a second end of the strip-shaped groove (12), the free end of the third smooth curve section deviates a third set angle relative to the connecting end along the circumferential direction of the bearing hole (11), the third set angle is an acute angle, and the deviation direction of the free end of the third smooth curve section relative to the connecting end is the same as the deviation direction of the second end of the strip-shaped groove (12) relative to the first end.
6. The bearing structure according to claim 5,
the value range of the first set angle is 25-50 degrees; and/or
The value range of the second set angle is 15-25 degrees; and/or
The value range of the third set angle is 25-50 degrees; and/or
The length between the connecting end and the free end of the first rounded curvilinear section in the axial direction of the bearing body (10) is 1/6 of the length of the bearing body (10) in the axial direction thereof; and/or
The length between the connecting end and the free end of the third smooth curved section in the axial direction of the bearing body (10) is 1/6 of the length of the bearing body (10) in the axial direction thereof; and/or
The bearing comprises a bearing body (10), wherein the length of the bearing body (10) in the axial direction is L, the inner diameter of a bearing hole (11) is D, the length-diameter ratio is L/D, and the value range of the length-diameter ratio is 1.8-2.
7. The bearing structure according to claim 1, wherein the bearing hole (11) has a hole radius R, and the rotating shaft (20) disposed in the bearing hole (11) has a radius R,
the radius gap delta is R-R; the distance between the hole center line of the bearing hole (11) and the central axis of the rotating shaft (20) is an eccentricity, the eccentricity is the ratio of the eccentricity to the radius clearance, and the value range of the eccentricity is 0.5-0.8; and/or
The relative clearance is C, (R-R)/R, with C ranging from 0.5% to 2%.
8. The bearing structure according to claim 1,
the outer wall surface of the bearing body (10) is provided with a plurality of annular grooves which are arranged at intervals along the axial direction of the bearing body (10), and elastic rings (14) are arranged in the annular grooves; and/or
The bearing body (10) is made of silicon nitride ceramic material; and/or
And a solid lubricating layer (13) is arranged on the inner wall surface of the bearing hole (11).
9. Bearing structure according to claim 8, characterized in that the thickness of the solid lubrication layer (13) is larger than 0.5 mm.
10. A water chilling unit including a compressor, characterised in that the compressor includes a bearing arrangement according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122995617.XU CN217107867U (en) | 2021-11-30 | 2021-11-30 | Bearing structure and water chilling unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122995617.XU CN217107867U (en) | 2021-11-30 | 2021-11-30 | Bearing structure and water chilling unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217107867U true CN217107867U (en) | 2022-08-02 |
Family
ID=82588027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122995617.XU Active CN217107867U (en) | 2021-11-30 | 2021-11-30 | Bearing structure and water chilling unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217107867U (en) |
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2021
- 2021-11-30 CN CN202122995617.XU patent/CN217107867U/en active Active
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