CN111503134A - Air compressor, motor and gas dynamic pressure radial bearing - Google Patents

Air compressor, motor and gas dynamic pressure radial bearing Download PDF

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Publication number
CN111503134A
CN111503134A CN202010349366.5A CN202010349366A CN111503134A CN 111503134 A CN111503134 A CN 111503134A CN 202010349366 A CN202010349366 A CN 202010349366A CN 111503134 A CN111503134 A CN 111503134A
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China
Prior art keywords
foil
flat
adjusting
flat foil
radial bearing
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Granted
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CN202010349366.5A
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Chinese (zh)
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CN111503134B (en
Inventor
华青松
邱瑞林
仙存妮
刘亚波
李胜永
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Beijing Wenli Tech Co ltd
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Beijing Wenli Tech Co ltd
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Priority to CN202010349366.5A priority Critical patent/CN111503134B/en
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Publication of CN111503134B publication Critical patent/CN111503134B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • F16C17/024—Sliding-contact bearings for exclusively rotary movement for radial load only with flexible leaves to create hydrodynamic wedge, e.g. radial foil bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Power Engineering (AREA)
  • Support Of The Bearing (AREA)

Abstract

The invention discloses an air compressor, a motor and a gas dynamic pressure radial bearing. According to the scheme, the top foil is designed into a combined structure of the first flat foil, the adjusting foil and the second flat foil, and the air gap between the top foil and the rotor is adjusted by adjusting the thickness of the top foil. Specifically, in the area where the first flat foil and the second flat foil are not supported by the adjusting foil, a gap is formed between the first flat foil and the second flat foil, the gap between the first flat foil and the second flat foil is subjected to micro-deformation under the action of pneumatic force, and the gap between the first flat foil and the second flat foil is adjusted by changing the number and the thickness of the adjusting foils, so that the adjustment of the wedge-shaped air gap between the top foil and the rotor is realized.

Description

Air compressor, motor and gas dynamic pressure radial bearing
Technical Field
The invention relates to the technical field of air compressors, in particular to an air compressor, a motor and a gas dynamic pressure radial bearing.
Background
A gas bearing is a sliding bearing that uses a gas as a lubricant.
The foil type gas dynamic pressure radial bearing is one kind of gas bearing and includes top foil, corrugated foil and bearing seat. In the operation process of the bearing, the corrugated foil can be slightly deformed under the action of pneumatic force, so that the self-adaptability of the bearing is enhanced.
The prior art discloses a gas dynamic foil bearing with an adjustable air gap, in which a gradual wedge gap between the rotor and the top foil is achieved by varying the height of the waves of the corrugated foil. However, the mode for realizing the wedge-shaped gap between the rotor and the top foil has high precision requirement on the stamping process and great processing difficulty.
Therefore, how to reduce the processing difficulty of the aerodynamic radial bearing becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of this, the present invention provides a gas dynamic pressure radial bearing to reduce the processing difficulty of the gas dynamic pressure radial bearing. The invention also provides an air compressor and a motor.
In order to achieve the purpose, the invention provides the following technical scheme:
a gas dynamic pressure radial bearing comprises a bearing seat, a bottom foil, a corrugated foil and a top foil which are coaxially arranged from outside to inside in sequence, wherein a positioning groove is formed in the inner wall of the bearing seat;
the width of the bottom foil, the width of the corrugated foil and the width of the top foil are equal to the width of the bearing, openings are formed in the bottom foil, the width of the corrugated foil and the width of the top foil, one ends of the openings are free ends, the other ends of the openings are fixed ends, fixing plates are arranged on the fixed ends, the fixing plates of the bottom foil, the width of the corrugated foil and the width of the top foil are mutually connected, the fixing plates can be embedded into the positioning grooves, and the free ends of the corrugated foil are opposite to the free ends of the bottom foil and the width of the top foil;
the top foil comprises a first flat foil, an adjusting foil and a second flat foil which are sequentially arranged from outside to inside, the first flat foil and the second flat foil are coaxially arranged, the first flat foil and the second flat foil are provided with openings, one end of each opening is a free end, the other end of each opening is a fixed end, the fixed ends are provided with fixing plates, the adjusting foils are strip-shaped foils, the number of the adjusting foils is multiple and the number of the adjusting foils is uniform in the circumferential direction of the second flat foil, and the length of the adjusting foils is equal to the width of the second flat foil.
Preferably, in the above aerodynamic radial bearing, the number of the adjustment foils is 3 to 12;
the width of the adjusting foil along the circumferential direction of the second flat foil is (0.25-0.75) × 2/(n pi r) mm, wherein n is the number of the adjusting foils, and r is the radius of the bearing seat.
Preferably, in the above aerodynamic radial bearing, the adjustment foil is bonded to the first flat foil and/or the second flat foil;
or, the adjusting foil is welded with the first flat foil and/or the second flat foil;
alternatively, the adjustment foil is riveted to the first flat foil and/or the second flat foil.
Preferably, in the above aerodynamic radial bearing, the adjustment foil is integrally formed with the first flat foil or the second flat foil.
Preferably, in the above aerodynamic radial bearing, the first flat foil and the second flat foil are both copper alloy foils, and both the outer surface of the first flat foil and the inner surface of the second flat foil are provided with a fluororesin layer.
Preferably, in the above aerodynamic radial bearing, a distance between a free end and a fixed end of each of the first flat foil, the second flat foil, and the corrugated foil is (2-5) × pi Δ R, where Δ R is a difference in radius between an inner hole of the bearing housing and the rotor.
Preferably, in the aerodynamic radial bearing, a fixing plate of the bottom foil is provided with a rivet, and the fixing plates of the corrugated foil, the first flat foil and the second flat foil are provided with rivet holes that are engaged with the rivet.
Preferably, in the aerodynamic radial bearing, an annular baffle is disposed at one end of the bearing seat, one end of the annular baffle is flush with an end face of the bearing seat, and the other end of the annular baffle can abut against end faces of the bottom foil, the corrugated foil and the top foil;
an inserting plate is arranged at one end, abutted against the annular baffle plate, of the adjusting foil, and a slot corresponding to the inserting plate is formed in the annular baffle plate;
one end of the fixing plate, which is close to the annular baffle plate, is provided with a positioning notch, and a positioning boss matched with the positioning notch is arranged in the mounting groove.
An electric machine comprising a gas dynamic pressure radial bearing as described in any one of the above aspects.
An air compressor comprises a motor, wherein the motor is the motor in the scheme.
According to the technical scheme, the aerodynamic radial bearing comprises a bearing seat, a bottom foil, a corrugated foil and a top foil. According to the scheme, the top foil is designed into a combined structure of the first flat foil, the adjusting foil and the second flat foil, and the air gap between the top foil and the rotor is adjusted by adjusting the thickness of the top foil. Specifically, in the area where the first flat foil and the second flat foil are not supported by the adjusting foil, a gap is formed between the first flat foil and the second flat foil, the gap between the first flat foil and the second flat foil is subjected to micro-deformation under the action of pneumatic force, and the gap between the first flat foil and the second flat foil is adjusted by changing the number and the thickness of the adjusting foils, so that the adjustment of the wedge-shaped air gap between the top foil and the rotor is realized.
The scheme also discloses a motor which comprises the aerodynamic radial bearing, wherein the aerodynamic radial bearing is recorded in any one scheme. Since the aerodynamic radial bearing has the technical effects, the motor with the aerodynamic radial bearing also has the same technical effects, and the details are not repeated herein.
The scheme also discloses an air compressor which comprises a motor, wherein the motor is recorded in the scheme. Because the motor has the technical effects, the air compressor with the motor also has the same technical effects, and the details are not repeated herein.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a gas dynamic radial bearing (without a bearing seat) according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a top foil structure according to an embodiment of the present invention;
FIG. 3 is a front view of a top foil provided by an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a corrugated foil according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a bottom foil according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a bearing seat provided in an embodiment of the present invention;
FIG. 7 is a schematic view of a partial structure of a top foil, a corrugated foil and a bottom foil before riveting according to an embodiment of the invention;
fig. 8 is a schematic partial structure diagram of a riveted top foil, a riveted corrugated foil and a riveted bottom foil according to an embodiment of the invention.
1. The bearing seat comprises a bearing seat 11, an annular baffle 12, a slot 13, a positioning boss 2, a bottom foil 21, a rivet 3, a corrugated foil 4, a top foil 41, a first flat foil 42, a second flat foil 43 and an adjusting foil.
Detailed Description
The invention discloses a gas dynamic pressure radial bearing, which aims to reduce the processing difficulty of the gas dynamic pressure radial bearing. The invention also discloses an air compressor and a motor.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 8, the present invention discloses a gas dynamic radial bearing, which includes a bearing seat 1, a bottom foil 2, a corrugated foil 3, and a top foil 4.
As shown in fig. 1, the bottom foil 2, the corrugated foil 3 and the top foil 4 are all cylindrical structures and are coaxially arranged from outside to inside in sequence.
The bearing seat 1 is sleeved outside the bottom foil 2, the bottom foil 2 is bent into a cylindrical structure with the same shape as the inner cavity of the bearing seat 1, the corrugated foil 3 is positioned in the inner cavity of the bottom foil 2 and is bent into a cylindrical structure with the same shape as the inner cavity of the bottom foil 2, the top foil 4 is positioned in the inner cavity of the corrugated foil 3 and is bent into a cylindrical structure with the same shape as the inner cavity of the corrugated foil 3, and the rotor is positioned in the inner cavity of the top foil 4.
The width of the bottom foil 2, the corrugated foil 3 and the top foil 4 is equal to the width of the bearing housing 1. Here, the width of the bearing seat 1 is the length of the bearing seat 1 along the axial direction thereof, and the widths of the bottom foil 2, the corrugated foil 3 and the top foil 4 are the lengths of the bottom foil 2, the corrugated foil 3 and the top foil 4 along the axial direction of the bearing seat 1.
As shown in fig. 1 to 5, the bottom foil 2, the corrugated foil 3 and the top foil 4 are all provided with openings, i.e. the cylindrical structures into which the bottom foil 2, the corrugated foil 3 and the top foil 4 are respectively bent are not closed cylindrical structures. The openings on the bottom foil 2, the corrugated foil 3 and the top foil 4 are all opened along the cylinder wall of each cylinder and are parallel to the axis of each bent cylindrical structure.
As shown in fig. 1-5, one end of the opening is a free end, the other end of the opening is a fixed end, and a fixed plate is arranged on the fixed end. Specifically, the free end is one end of the bottom foil 2, the corrugated foil 3 and the top foil 4 which can move along the circumferential direction of the free end under the action of aerodynamic force, and is used for absorbing circumferential deformation of the bottom foil 2, the corrugated foil 3 and the top foil 4 caused by the action of radial aerodynamic force; the fixing plate is used for fixing the bottom foil 2, the corrugated foil 3 and the top foil 4 in the positioning groove of the bearing seat 1 and limiting the circumferential and axial movement of the bottom foil 2, the corrugated foil 3 and the top foil 4 in the bearing seat 1.
The opening in this scheme needs to have certain size along the circumference of bearing frame 1, has the clearance between the stiff end and the free end of bottom foil 2, ripple foil 3 and top foil 4 promptly, guarantees that the motion of respective free end is unimpeded.
In a specific embodiment of the present solution, the distance between the free end and the fixed end of the first flat foil 41, the second flat foil 42 and the corrugated foil 3 is (2-5) × pi Δ R, where Δ R is the radius difference between the inner hole of the bearing seat 1 and the rotor.
The bottom foil 2 is used for enveloping the corrugated foil 3 and the top foil 4, so that the whole structure consisting of the bottom foil 2, the corrugated foil 3 and the top foil 4 is conveniently arranged in the bearing seat 1, meanwhile, the free end of the bottom foil 2 is used for ensuring that the bottom foil 2, the corrugated foil 3 and the top foil 4 can be slightly adjusted in the outer diameter of a cylindrical structure enclosed by the bottom foil 2 after being arranged in the bearing seat 1, and after the gas dynamic pressure radial bearing is machined, the outer wall of a cylinder enclosed by the bottom foil 2 is in tight fit with the inner hole of the bearing seat 1.
As shown in fig. 1, after the bottom foil 2, the corrugated foil 3 and the top foil 4 are sequentially sleeved, the free end of the corrugated foil 3 is opposite to the free ends of the bottom foil 2 and the top foil 4, and the fixing plates of the bottom foil 2, the corrugated foil 3 and the top foil 4 are sequentially stacked.
During installation, the fixing plates of the bottom foil 2, the corrugated foil 3 and the top foil 4 are connected to fix the fixing ends of the bottom foil 2, the corrugated foil 3 and the top foil 4, then the whole body formed by the bottom foil 2, the corrugated foil 3 and the top foil 4 is placed into the inner cavity of the bearing seat 1, and the fixing plates of the bottom foil 2, the corrugated foil 3 and the top foil 4 are embedded into the positioning grooves.
In one embodiment of the present disclosure, the top foil 4 includes a first flat foil 41, a regulating foil 43 and a second flat foil 42 sequentially arranged from outside to inside. The adjusting foil 43 is located between the first flat foil 41 and the second flat foil 42, the adjusting foil 43 is a sheet-like structure, the first flat foil 41 and the second flat foil 42 are both bent into a cylindrical structure, and the cylindrical structures formed by bending the first flat foil 41 and the second flat foil 42 are coaxially arranged.
The first flat foil 41 and the second flat foil 42 are both provided with openings, one end of each opening is a free end, the other end of each opening is a fixed end, and a fixed plate is arranged on each fixed end.
The adjusting foils 43 are strip-shaped foils, the number of the adjusting foils 43 is multiple, the adjusting foils are uniformly distributed along the circumferential direction of the second flat foil 42, the length of the adjusting foils 43 is equal to the width of the second foils, and the width of the adjusting foils 43 is far smaller than the circumferential length of the second foils. Here, the width of the second foil is the length of the second foil in the axial direction of the bearing housing 1, the length of the adjustment foil 43 is also the length in the axial direction of the bearing housing 1, and the width of the adjustment foil 43 is the length in the circumferential direction of the cylinder surrounded by the second foil.
In the scheme, the top foil 4 is designed to be a combined structure of the first flat foil 41, the adjusting foil 43 and the second flat foil 42, and the air gap between the top foil 4 and the rotor is adjusted by adjusting the thickness of the top foil 4. Specifically, in the area where the first flat foil 41 and the second flat foil 42 are not supported by the adjusting foil 43, a gap is formed between the first flat foil 41 and the second flat foil 42, the gap between the first flat foil 41 and the second flat foil 42 is slightly deformed under the action of pneumatic power, and the gap between the first flat foil 41 and the second flat foil 42 is adjusted by changing the number and the thickness of the adjusting foil 43, so that the adjustment of the wedge-shaped air gap between the top foil 4 and the rotor is realized, that is, the air gap between the top foil 4 and the rotor can be adjusted by only selecting the adjusting foil 43 with a proper thickness, and compared with the prior art that the air gap is adjusted by making corrugations with different heights on the corrugated foil 3 through a stamping process, the processing difficulty of the aerodynamic radial bearing is reduced.
The gas dynamic pressure radial bearing disclosed by the scheme can adjust the bearing capacity of the gas dynamic pressure radial bearing and ensure that a rotor supported by the gas dynamic pressure radial bearing can stably run at a high speed.
In a specific embodiment of the present solution, the number of the adjusting foils 43 is 3-12, that is, the number of the adjusting foils 43 may be 3, 4, 5, 6 … … 10, 11 or 12, and the number of the adjusting foils 43 is selected by those skilled in the art according to the size of the bearing and the requirement of the air gap.
The number of the adjustment foils 43 is not limited to the above number, and may be other numbers, which are selected by those skilled in the art according to actual needs, but the number of the adjustment foils 43 is determined to be an integer.
In a particular embodiment of the solution, the width of the adjusting foil 43 is (0.25-0.75) × 2/(n pi r) mm, where n is the number of adjusting foils 43, r is the radius of the bearing housing 1 and pi is the circumferential ratio.
The adjustment foils 43 are uniformly distributed along the circumferential direction of the second flat foil 42, and a plurality of gaps uniformly distributed along the circumferential direction of the second flat foil 42 are formed between the first flat foil 41 and the second flat foil 42. When the device is used, the top foil 4 is uniformly deformed in the circumferential direction, the bearing capacity of the gas dynamic pressure radial bearing is adjusted, and the rotor supported by the gas dynamic pressure radial bearing can stably run at a high speed.
The adjustment foil 43 may be connected only to the first flat foil 41, only to the second flat foil 42, or to both the first flat foil 41 and the second flat foil 42.
The connection of the adjusting foil 43 and the first flat foil 41 and/or the second flat foil 42 can be as follows:
first, the adjustment foil 43 is adhered to the first flat foil 41 and/or the second flat foil 42;
secondly, the adjusting foil 43 is welded with the first flat foil 41 and/or the second flat foil 42;
third, the adjustment foil 43 is riveted to the first flat foil 41 and/or the second flat foil 42.
The connection manner of the adjustment foil 43 and the first flat foil 41 and/or the second flat foil 42 is not limited to the above, and other connection manners of the adjustment foil 43 and the first flat foil 41 and/or the second flat foil 42 may also be implemented, and are not limited in particular herein.
The adjustment foil 43 may be a separate part with respect to the first and second flat foils 41 and 42, or may be a part of the first or second flat foil 41 or 42.
When the adjustment foil 43 is a part of the first flat foil 41 or the second flat foil 42, the adjustment foil 43 is a sheet-shaped protrusion integrally formed with the first flat foil 41 or the second flat foil 42.
In the scheme, the first flat foil 41 and the second flat foil 42 are both copper alloy foils, and the outer surface of the first flat foil 41 and the inner surface of the second flat foil 42 are both provided with fluororesin layers, that is, the first flat foil 41 and the second flat foil 42 are both of a copper alloy-fluororesin double-layer composite structure, and the fluororesin layers of the first flat foil 41 and the second flat foil 42 are opposite.
In the copper alloy-fluorine resin double-layer composite structure, the copper alloy can be one of tin bronze, beryllium bronze or copper nickel tin alloy, and the fluorine resin can be tetrafluoroethylene and hexafluoropropylene copolymer (FEP) or a mixture of tetrafluoroethylene, hexafluoropropylene copolymer and polytetrafluoroethylene.
The thickness of the top foil 4 of the copper alloy-fluororesin double-layer composite structure can reach 0.05mm at least, and the thickness of the top foil 4 is reduced, so that the overall size of the gas dynamic pressure radial bearing is reduced, and the compactness of the gas dynamic pressure radial bearing is improved.
In a specific embodiment of the present embodiment, the top foil 4 has a total thickness of 0.2mm, wherein the copper alloy layer has a thickness of 0.07mm, the fluororesin layer has a thickness of 0.03mm, and the adjustment foil 43 has a thickness of 0.1mm and is 3 in number.
In another embodiment of the present embodiment, the top foil 4 has a total thickness of 0.30mm, in which the copper alloy layer has a thickness of 0.12mm, the fluororesin layer has a thickness of 0.03mm, and the adjustment foil 43 has a thickness of 0.15mm and the number of pieces is 3.
In addition, the copper alloy-fluororesin double-layer composite structure has good binding force, the working durability of the gas dynamic pressure radial bearing is prolonged, and the service life of the gas dynamic pressure radial bearing is longer.
The fluororesin layer is a self-lubricating coating of the rotor and the bearing, has lower dynamic friction coefficient and static friction coefficient, and ensures that the pneumatic dynamic pressure radial bearing achieves higher bearing efficiency because of low friction power in the starting and normal operation processes.
In a specific embodiment of the present embodiment, the adjusting foil 43 is also a copper alloy foil, a fluororesin layer is not disposed on a side of the adjusting foil 43 connected to the first flat foil 41 and/or the second flat foil 42, and a fluororesin layer is disposed on a side of the adjusting foil 43 not connected to the first flat foil 41 and/or the second flat foil 42, and accordingly, the adjusting foil 43 of the present embodiment is also a copper alloy-fluororesin double-layer composite structure.
In one embodiment of the present disclosure, the fixing plates of the bottom foil 2, the corrugated foil 3, the first flat foil 41 and the second flat foil 42 are connected by the rivet 21.
Specifically, the fixing plate of the bottom foil 2 is provided with a rivet 21, the fixing plates of the corrugated foil 3, the first flat foil 41 and the second flat foil 42 are respectively provided with a rivet hole matched with the rivet 21, the rivet 21 sequentially penetrates through the rivet hole of the corrugated foil 3, the rivet hole of the first flat foil 41 and the rivet hole of the second flat foil 42, and then the bottom foil 2, the corrugated foil 3, the first flat foil 41 and the second flat foil 42 are connected by punching the rivet 21 through a punching machine.
Specifically, a rivet hole may be formed in the fixing plate of the bottom foil 2, the rivet 21 may be disposed on the bottom foil 2 through the rivet hole of the bottom foil 2, or the bottom foil 2 and the rivet 21 may be integrally formed, and in this embodiment, the rivet hole does not need to be formed in the bottom foil 2.
In the embodiment where the base foil 2 is integrally formed with the rivet 21, the rivet 21 is formed by punching the rivet 21 integrally with the base foil 2 through a punching process.
Preferably, the number of the rivets 21 is 2-4, and the number of the rivet holes is equal to the number of the rivets 21.
The fixing plates of the bottom foil 2, the corrugated foil 3, the first flat foil 41 and the second flat foil 42 may be further connected by bonding or welding.
The connection of the bottom foil 2, the corrugated foil 3, the first flat foil 41 and the second flat foil 42 is realized through riveting, welding or bonding and other processes, the process is simple and easy to realize, and the large-scale production of the aerodynamic radial bearing is facilitated.
As shown in fig. 6, one end of the bearing seat 1 is provided with an annular baffle plate 11, one end of the annular baffle plate 11 is flush with the end face of the bearing seat, the other end of the annular baffle plate can be abutted against the end faces of the bottom foil 2, the corrugated foil 3 and the top foil 4, and the annular baffle plate 11 realizes axial limiting of the bottom foil 2, the corrugated foil 3 and the top foil 4. When the bearing seat is installed, the bottom foil 2, the corrugated foil 3 and the top foil 4 extend into the bearing seat 1 from one end of the bearing seat 1, which is not provided with the annular baffle plate 11, to be abutted against the annular baffle plate 11.
An inserting plate (not shown) is disposed at one end of the adjusting foil 43, which is abutted against the annular baffle plate 11, and as shown in fig. 6, the annular baffle plate 11 is provided with an inserting groove 12 corresponding to the inserting plate. After the bottom foil 2, the corrugated foil 3 and the top foil 4 extend into the bearing seat 1, the inserting plate of the adjusting foil 43 is inserted into the inserting groove 12, and the inserting groove 12 realizes the axial and circumferential positioning of the adjusting foil 43.
Preferably, the adjusting foil 43 is integrally formed with the insert plate.
As shown in fig. 1, 2, 4 and 5, one end of the fixing plate close to the annular baffle 11 is provided with a positioning notch, and a positioning boss 13 matched with the positioning notch is arranged in the mounting groove.
The scheme also discloses a motor which comprises the aerodynamic radial bearing, wherein the aerodynamic radial bearing is recorded in any one scheme.
Since the aerodynamic radial bearing has the technical effects, the motor with the aerodynamic radial bearing also has the same technical effects, and the details are not repeated herein.
The scheme also discloses an air compressor which comprises a motor, wherein the motor is recorded in the scheme.
Because the motor has the technical effects, the air compressor with the motor also has the same technical effects, and the details are not repeated herein.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A gas dynamic pressure radial bearing is characterized by comprising a bearing seat (1), a bottom foil (2), a corrugated foil (3) and a top foil (4) which are coaxially arranged from outside to inside in sequence, wherein a positioning groove is formed in the inner wall of the bearing seat (1);
the width of the bottom foil (2), the width of the corrugated foil (3) and the width of the top foil (4) are equal to the width of the bearing, openings are formed in the bottom foil (2), the width of the corrugated foil (3) and the width of the top foil (4), one end of each opening is a free end, the other end of each opening is a fixed end, a fixing plate is arranged on each fixed end, the fixing plates of the bottom foil (2), the width of the corrugated foil (3) and the width of the top foil (4) are mutually connected, the fixing plates can be embedded into the positioning grooves, and the free ends of the corrugated foil (3) are opposite to the free ends of the bottom foil (2) and the width of the top foil (4);
the top foil (4) comprises a first flat foil (41), an adjusting foil (43) and a second flat foil (42) which are sequentially arranged from outside to inside, the first flat foil (41) and the second flat foil (42) are coaxially arranged, the first flat foil (41) and the second flat foil (42) are all provided with openings, one ends of the openings are free ends, the other ends of the openings are fixed ends, the fixed ends are provided with fixing plates, the adjusting foil (43) is a long strip-shaped foil, the number of the adjusting foils (43) is multiple and is along the circumferential uniform distribution of the second flat foil (42), and the length of the adjusting foil (43) is equal to the width of the second flat foil (42).
2. Aerodynamic radial bearing according to claim 1, characterized in that the number of adjusting foils (43) is 3-12;
the width of the adjusting foil (43) along the circumferential direction of the second flat foil (42) is (0.25-0.75) × 2/(n pi r) mm, wherein n is the number of the adjusting foils (43), and r is the radius of the bearing seat (1).
3. Aerodynamic radial bearing according to claim 1, characterized in that the adjusting foil (43) is bonded to the first flat foil (41) and/or the second flat foil (42);
or the adjusting foil (43) is welded with the first flat foil (41) and/or the second flat foil (42);
alternatively, the adjustment foil (43) is riveted to the first flat foil (41) and/or the second flat foil (42).
4. Aerodynamic radial bearing according to claim 1, characterized in that the adjusting foil (43) is integrally formed with the first flat foil (41) or the second flat foil (42).
5. The aerodynamic radial bearing according to claim 1, wherein the first flat foil (41) and the second flat foil (42) are both copper alloy foils, and wherein an outer surface of the first flat foil (41) and an inner surface of the second flat foil (42) are both provided with a fluororesin layer.
6. Aerodynamic radial bearing according to claim 1, characterized in that the distance between the free and fixed ends of the first flat foil (41), the second flat foil (42) and the corrugated foil (3) is (2-5) × pi Δ R, where Δ R is the radius difference between the inner bore of the bearing housing (1) and the rotor.
7. The aerodynamic radial bearing according to claim 1, wherein a rivet (21) is provided on the fixing plate of the bottom foil (2), and rivet holes for fitting the rivet (21) are formed in the fixing plates of the corrugated foil (3), the first flat foil (41), and the second flat foil (42).
8. Aerodynamic radial bearing according to claim 1, characterized in that one end of the bearing seat (1) is provided with an annular baffle (11), one end of the annular baffle (11) being flush with the end face of the bearing seat (1), the other end of the annular baffle (11) being capable of abutting against the end faces of the bottom foil (2), the corrugated foil (3) and the top foil (4);
an inserting plate is arranged at one end, abutted against the annular baffle plate (11), of the adjusting foil sheet (43), and a slot (12) corresponding to the inserting plate is formed in the annular baffle plate (11);
one end of the fixing plate, which is close to the annular baffle (11), is provided with a positioning notch, and a positioning boss (13) matched with the positioning notch is arranged in the mounting groove.
9. An electrical machine comprising a gas dynamic radial bearing as claimed in any one of claims 1 to 8.
10. An air compressor comprising an electric motor as claimed in claim 10.
CN202010349366.5A 2020-04-28 2020-04-28 Air compressor, motor and gas dynamic pressure radial bearing Active CN111503134B (en)

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CN112943789A (en) * 2021-04-08 2021-06-11 烟台东德实业有限公司 Radial air dynamic pressure bearing with adjustable slots
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CN116972067B (en) * 2023-09-25 2023-11-28 天津飞旋科技股份有限公司 Dynamic and static pressure mixed foil bearing and shafting

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