CN211370810U - Radial dynamic pressure gas bearing, compressor and air conditioning unit - Google Patents
Radial dynamic pressure gas bearing, compressor and air conditioning unit Download PDFInfo
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- CN211370810U CN211370810U CN202020041897.3U CN202020041897U CN211370810U CN 211370810 U CN211370810 U CN 211370810U CN 202020041897 U CN202020041897 U CN 202020041897U CN 211370810 U CN211370810 U CN 211370810U
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Abstract
The utility model relates to a radial dynamic pressure gas bearing, compressor and air conditioning unit, wherein radial dynamic pressure gas bearing includes bearing housing (10), ripples paper tinsel (20) and top paper tinsel (30), and ripples paper tinsel (20) are put between bearing housing (10) and top paper tinsel (30), has cavity (40) between the inner wall of bearing housing (10) and ripples paper tinsel (20), and bearing housing (10) are equipped with the passageway of ventilating, and the passageway of ventilating is used for introducing gas in to cavity (40). The compressor includes a radial dynamic pressure gas bearing. The air conditioning unit includes a compressor. The utility model discloses a passageway of ventilating that sets up on bearing housing can be to the inner wall that is located bearing housing and the cavity of ripples between the paper tinsel introducing gas, can adjust the rigidity of ripples paper tinsel through the gas of introducing, makes the bearing adapt to the vibration of rotor better, promotes the stability of the compressor of using this bearing at the operation in-process.
Description
Technical Field
The utility model relates to a compressor technical field especially relates to a radial dynamic pressure gas bearing, compressor and air conditioning unit.
Background
The wave foil pneumatic suspension centrifugal compressor supports the rotor to suspend by utilizing the force generated by the dynamic pressure effect of the gas bearing in the high-speed rotation process, the compressor can realize oil-free and friction-free operation, the bearing does not have mechanical power consumption, a complex oil circuit system can be omitted, the friction between lubricating oil and a high-speed shaft is also avoided, the friction loss is reduced, and the compressor is simple in structure, high in efficiency and simple and convenient to maintain.
However, in practical use, the dynamic pressure air suspension compressor is subjected to complex stress during starting and running processes, unstable vibration of the rotor is easily caused, the rigidity of the bearing cannot adapt to the vibration of the rotor, and the rotor still rubs against the bearing at certain stages, so that the service lives of the rotor and the bearing are influenced.
It is noted that the information disclosed in this background section of the invention is only for enhancement of understanding of the general background of the invention, and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a radial dynamic pressure gas bearing, compressor and air conditioning unit to improve the adaptability of bearing to rotor vibration.
In order to achieve the above object, the present invention provides a radial dynamic pressure gas bearing, including:
a bearing housing;
a top foil; and
the bump foil is arranged between the bearing shell and the top foil, a cavity is formed between the inner wall of the bearing shell and the bump foil, and the bearing shell is provided with a ventilation channel which is used for introducing gas into the cavity.
In some embodiments, the vent passage comprises a vent hole that extends radially through the bearing housing.
In some embodiments, the vent passage comprises a plurality of vent holes arranged in an axial and/or circumferential direction of the bearing housing.
In some embodiments, the bump foil includes a first wave band in contact with the inner wall of the bearing housing and a second wave band that is convex away from the inner wall of the bearing housing to form a cavity between the second wave band and the inner wall of the bearing housing, the vent hole being in communication with the cavity.
In some embodiments, the vent is disposed in a middle portion of a portion of the bearing housing corresponding to the second band.
In some embodiments, the vent passage includes a vent groove extending in an axial direction of the bearing housing, the vent hole communicating with the vent groove.
In some embodiments, the vent slot is provided on a side of the bearing housing remote from the bump foil.
In some embodiments, the cavity is in communication with a space between the bump foil and the top foil.
In order to achieve the above object, the present invention further provides a compressor, including the above radial dynamic pressure gas bearing.
In some embodiments, a delivery passage is provided in the compressor, the delivery passage is communicated with the ventilation passage for delivering gas to the ventilation passage, and the delivery passage is provided with a regulating valve.
In order to achieve the above object, the present invention further provides an air conditioning unit, including the above compressor.
In some embodiments, the air conditioning unit further includes a refrigerant delivery pipe, and the refrigerant delivery pipe is communicated with the ventilation channel.
In some embodiments, the air conditioning unit further comprises a booster pump, and an air outlet of the booster pump is communicated with the ventilation channel.
Based on above-mentioned technical scheme, the embodiment of the utility model provides an in be equipped with the passageway of ventilating on the bearing housing, through this passageway of ventilating, can be to the inner wall that is located the bearing housing and the wave foil in the cavity between the cavity introduce gas, can adjust the rigidity of wave foil through the gas of introducing, change the compressive capacity of wave foil, make the bearing adapt to the vibration of rotor better, promote and use the utility model discloses the compressor of bearing is at the stability of operation in-process.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
fig. 1 is a schematic structural diagram of an embodiment of the radial hydrodynamic gas bearing of the present invention.
Fig. 2 is a perspective view of an embodiment of the radial hydrodynamic gas bearing of the present invention.
Fig. 3 is a perspective view of another embodiment of the radial hydrodynamic gas bearing of the present invention.
Fig. 4 is a schematic partial structural view of an embodiment of the compressor of the present invention.
Fig. 5 is a schematic partial structural view of another embodiment of the compressor of the present invention.
Fig. 6 is a schematic partial structural view of another embodiment of the compressor of the present invention.
In the figure:
10. a bearing housing; 11. a vent hole; 12. a vent channel; 13. a gap; 20. a bump foil; 30. a top foil; 40. a cavity; 50. a delivery channel; 60. adjusting a valve; 70. a bearing support; 80. a rotor; 90. a stator; 100. a motor housing; 110. a refrigerant conveying pipe; 120. a booster pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "lateral", "longitudinal", "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the scope of the invention.
In order to adapt to the complex stress process of the rotor and improve the running stability of the rotor, the inventor finds that the rigidity characteristic of the bearing can be changed according to the vibration characteristic of the rotor in the running process of the rotor, so that the bearing can adapt to the vibration of the rotor.
Based on the above thought, the inventor has improved the bearing structure. Referring to fig. 1 and 2, in an embodiment of the radial hydrodynamic gas bearing provided by the present invention, the bearing includes a bearing housing 10, a bump foil 20 and a top foil 30, wherein the bump foil 20 is disposed between the bearing housing 10 and the top foil 30, a cavity 40 is provided between an inner wall of the bearing housing 10 and the bump foil 20, and the bearing housing 10 is provided with a vent channel for introducing gas into the cavity 40.
In the above-mentioned embodiment, be equipped with the passageway of ventilating on the bearing housing 10, through this passageway of ventilating, can be to the cavity 40 that is located between the inner wall of bearing housing 10 and the ripples foil 20 in introducing gas, can adjust the rigidity of ripples foil 20 through the gas of introducing, change the compressive capacity of ripples foil 20, make the bearing adapt to the vibration of rotor better, promote and use the utility model discloses the compressor of bearing is at the stability of operation in-process.
The bearing housing 10 is cylindrical in shape, circular in cross section, hollow in the middle, and the rotor is disposed in the central through hole of the bearing housing 10.
The specific configuration of the vent passage can be selected in many ways.
As shown in fig. 1 and 2, the vent passage includes a vent hole 11, and the vent hole 11 radially penetrates the bearing housing 10. Through the vent holes 11, gas can be guided from the outside to the inside of the bearing housing 10.
The vent channel may comprise a plurality of vent holes 11, and the plurality of vent holes 11 may be arranged in the axial and/or circumferential direction of the bearing housing 10.
As shown in fig. 1, a plurality of vent holes 11 are arranged along the circumferential direction of the bearing housing 10. Wherein a part of the ventilation holes 11 are arranged at even intervals.
As shown in fig. 2, a plurality of vent holes 11 are uniformly arranged in the axial direction of the bearing housing 10, and a plurality of rows are arranged in the circumferential direction.
The bump foil 20 includes a first wave band contacting the inner wall of the bearing housing 10 and a second wave band protruding in a direction away from the inner wall of the bearing housing 10 to form a cavity 40 between the second wave band and the inner wall of the bearing housing 10, and the vent hole 11 communicates with the cavity 40.
The convex shape of the second wavelength band in a direction away from the inner wall of the bearing housing 10 may be a semicircle or an arch.
The vent hole 11 is provided in the middle of the portion of the bearing housing 10 corresponding to the second band. The arrangement can ensure that the vent hole 11 is far away from the position of the bearing shell 10, which is in contact with the first wave band, so that the vent hole 11 is not covered by the first wave band, and the gas flowing out of the vent hole 11 can smoothly enter the cavity 40.
The axis of the vent 11 may be co-linear with the point of the cavity 40 furthest from the inner wall of the bearing housing 10, which may further ensure that the vent 11 is spaced away from the location of the bearing housing 10 in contact with the first wave band so that the vent 11 is uncovered by the first wave band.
As shown in fig. 3, the vent passage may further include a vent groove 12, the vent groove 12 extending in the axial direction of the bearing housing 10, and the vent hole 11 communicating with the vent groove 12.
Through setting up the air channel 12, can communicate a plurality of air vents 11 simultaneously along the axial, can reach a plurality of air vents 11 like this when letting in air vent 12, need not make every air vent 11 communicate with the air supply alone, be favorable to simplifying the arrangement of communicating pipe.
The vent grooves 12 are provided on the side of the bearing housing 10 remote from the bump foil 20 to facilitate communication of the vent grooves 12 with the air supply source.
The cavity 40 is interconnected with the space between the bump foil 20 and the top foil 30, such that gas introduced into the cavity 40 may also flow into the space between the bump foil 20 and the top foil 30 to increase the stiffness of the top foil 30 and change the pressure resistance of the top foil 30.
Based on foretell radial dynamic pressure gas bearing, the utility model discloses still provide a compressor, this compressor includes foretell radial dynamic pressure gas bearing.
As shown in fig. 4, a delivery passage 50 is provided in the compressor, the delivery passage 50 is communicated with the ventilation passage for delivering gas to the ventilation passage, and the delivery passage 50 is provided with a regulating valve 60.
The feed channel 50 may be provided on the motor housing 100 and the bearing support 70. By providing the regulating valve 60, the pressure of the gas delivered by the delivery channel 50 can be regulated, thereby regulating the stiffness of the bump foil 20 and the top foil 30 and changing the pressure resistance of the bump foil 20 and the top foil 30.
Based on foretell compressor, the utility model discloses still provide an air conditioning unit, this air conditioning unit includes foretell compressor.
As shown in fig. 5, the air conditioning unit further includes a refrigerant delivery pipe 110, and the refrigerant delivery pipe 110 is communicated with the ventilation channel. Therefore, the rigidity of the wave foil 20 and the rigidity of the top foil 30 can be adjusted by using the refrigerant in the air conditioning unit, the utilization value of the refrigerant is improved, and the cost for arranging an external air supply source is saved.
Specifically, the refrigerant in the refrigerant delivery pipe 110 may be from an exhaust port of the compressor or from a location such as a condenser.
The refrigerant delivery pipe 110 may be directly connected to the ventilation passage, or may be indirectly connected to the ventilation passage through the delivery passage 50.
As shown in fig. 6, the air conditioning unit may further include a booster pump 120, and an air outlet of the booster pump 120 is communicated with the ventilation passage. By providing the booster pump 120, high-pressure gas can be supplied into the ventilation passage. Compared with the refrigerant in the air conditioning unit, the scheme of arranging the booster pump 120 is more convenient for controlling the pressure of the introduced gas, has higher degree of freedom, and does not lose the refrigerating capacity of the air conditioning unit. Moreover, when the compressor is in the starting stage and the pressure difference is not established at the inlet and the outlet of the compressor, the gas introduced into the ventilation channel can be provided by the booster pump 120, so that the problem that the gas cannot be normally introduced due to the absence of the pressure difference is avoided, and the problem that the rigidity of the bearing cannot be adjusted in the starting stage of the compressor is solved.
The positive technical effects of the radial dynamic pressure gas bearing in the above embodiments are also applicable to the compressor and the air conditioning unit, and are not described herein again.
The structure of an embodiment of the radial hydrodynamic gas bearing and the structure of a compressor using the same according to the present invention will be described in detail below with reference to fig. 1 to 6:
as shown in fig. 1, the radial hydrodynamic gas bearing includes a bearing housing 10, a bump foil 20, and a top foil 30, the bump foil 20 being located between the bearing housing 10 and the top foil 30. The top foil 30 has a cylindrical shape formed by bending a sheet foil, a gap 13 is formed at a joint of both ends, and the top foil 30 is continuous in the circumferential direction. The top foil 30 is fixed to the bearing housing 10 at one end and is free at the other end.
The bump foil 20 has a segmented structure, and includes three segments, and one end of each segment of the bump foil 20 is fixed to the bearing housing 10, and the other end is a free end. Each band foil 20 includes a plurality of first bands and a plurality of second bands, the first bands and the second bands being spaced apart. The first wave band is in contact with the inner wall of the bearing housing 10 and the second wave band is convex away from the inner wall of the bearing housing 10 to form a cavity 40 between the inner wall of the bearing housing 10 and the bump foil 20.
The bearing shell 10 is provided with a plurality of vent holes 11, the vent holes 11 are communicated with the cavities 40, the vent holes 11 correspond to the cavities 40 one by one, and the number of the vent holes 11 is equal to that of the cavities 40. Also, the vent hole 11 is opened in the middle of the portion of the bearing housing 10 corresponding to the second band.
As shown in fig. 2, a plurality of vent holes 11 are uniformly arranged in the bearing housing 10 in the axial direction, and a plurality of rows are arranged in the circumferential direction.
As shown in fig. 3, a plurality of ventilation grooves 12 extending in the axial direction are further provided on the outer side of the bearing housing 10, and the ventilation holes 11 are opened in the bottom of the ventilation grooves 12.
As shown in fig. 4, the compressor includes a radial dynamic pressure gas bearing, a rotor 80, a stator 90, and a motor housing 100. The stator 90 is fixed to the motor housing 100, and the bearing holder 70 is coupled to the motor housing 100. The two bearing supports 70 are respectively located at two ends of the motor housing 100, and the two radial dynamic pressure gas bearings are respectively installed on the corresponding bearing supports 70.
The radial hydrodynamic gas bearing comprises a bearing housing 10, a bump foil 20 and a top foil 30. The rotor 80 is inserted into the central through hole of the bearing housing 10, inside the top foil 30. A gas film gap is formed between the top foil 30 and the rotor 80, and when the compressor is in operation, gas enters the gas film gap to form a dynamic pressure gas film, so that the rotor is suspended.
The motor housing 100 and the bearing support 70 are both provided with a conveying channel 50, and the conveying channel 50 is provided with a regulating valve 60.
As shown in fig. 5, the compressor further includes a refrigerant delivery pipe 110, a refrigerant participating in a cooling or heating cycle is disposed in the refrigerant delivery pipe 110, the refrigerant delivery pipe 110 is communicated with the delivery passage 50, and the delivery passage 50 is communicated with the vent hole 11.
As shown in fig. 6, the compressor further includes a booster pump 120, the booster pump 120 being for supplying a high-pressure gas, the booster pump 120 being communicated with the delivery passage 50 through a delivery pipe, the delivery passage 50 being communicated with the vent hole 11.
In other embodiments, the compressor may be provided with the refrigerant delivery pipe 110 and the booster pump 120 which are communicated with the delivery passage 50 at the same time, so that when the compressor is just started, gas can be provided by the booster pump 120 to be introduced into the ventilation passage, and the rigidity of the bearing is adjusted; when the compressor works normally, the high-pressure side gas (namely, refrigerant) of the unit can be utilized and is input into the ventilation channel through the regulating valve, the rigidity of the bearing is regulated, the variable rigidity of the bearing is realized, and the anti-interference capability of the compressor in the operation process is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the utility model discloses a do not deviate from under the prerequisite of the principle, still can be right the utility model discloses a specific embodiment modifies or carries out the equivalent replacement to some technical features, and these are modified and should be covered with the equivalent replacement in the middle of the technical scheme scope of the utility model.
Claims (13)
1. A radial hydrodynamic gas bearing, comprising:
a bearing housing (10);
a top foil (30); and
a bump foil (20) arranged between the bearing housing (10) and the top foil (30) with a cavity (40) between the inner wall of the bearing housing (10) and the bump foil (20), the bearing housing (10) being provided with a venting channel for introducing gas into the cavity (40).
2. Radial hydrodynamic gas bearing according to claim 1, characterized in that the venting channels comprise venting holes (11), the venting holes (11) extending radially through the bearing housing (10).
3. Radial hydrodynamic gas bearing according to claim 2, characterized in that the venting channel comprises a plurality of said venting holes (11), the plurality of venting holes (11) being arranged in the axial and/or circumferential direction of the bearing housing (10).
4. The radial hydrodynamic gas bearing according to claim 2, characterized in that the bump foil (20) includes a first wave band contacting an inner wall of the bearing housing (10) and a second wave band protruding away from the inner wall of the bearing housing (10) to form the cavity (40) between the second wave band and the inner wall of the bearing housing (10), the vent hole (11) communicating with the cavity (40).
5. The radial hydrodynamic gas bearing according to claim 4, characterized in that the vent hole (11) is provided in the middle of the portion of the bearing housing (10) corresponding to the second wave band.
6. Radial hydrodynamic gas bearing according to claim 2, characterized in that the venting channel comprises a venting groove (12), the venting groove (12) extending in the axial direction of the bearing housing (10), the venting hole (11) communicating with the venting groove (12).
7. Radial hydrodynamic gas bearing according to claim 6, characterized in that the venting grooves (12) are provided on the side of the bearing housing (10) remote from the bump foil (20).
8. Radial hydrodynamic gas bearing according to claim 1, characterized in that the cavity (40) is in communication with the space between the bump foil (20) and the top foil (30).
9. A compressor comprising the radial dynamic pressure gas bearing according to any one of claims 1 to 8.
10. Compressor according to claim 9, characterized in that a delivery channel (50) is provided in the compressor, said delivery channel (50) communicating with said ventilation channel for delivering gas to said ventilation channel, said delivery channel (50) being provided with a regulating valve (60).
11. Air conditioning assembly, characterized in that it comprises a compressor according to claim 9 or 10.
12. The air conditioning unit as set forth in claim 11, further comprising a refrigerant delivery pipe (110), the refrigerant delivery pipe (110) communicating with the vent passage.
13. The air conditioning assembly as set forth in claim 11, further comprising a booster pump (120), an air outlet of said booster pump (120) being in communication with said vent passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020041897.3U CN211370810U (en) | 2020-01-09 | 2020-01-09 | Radial dynamic pressure gas bearing, compressor and air conditioning unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020041897.3U CN211370810U (en) | 2020-01-09 | 2020-01-09 | Radial dynamic pressure gas bearing, compressor and air conditioning unit |
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| CN211370810U true CN211370810U (en) | 2020-08-28 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112664470A (en) * | 2020-12-24 | 2021-04-16 | 北京理工大学 | High-speed air compressor convenient to heat dissipation |
| CN112682336A (en) * | 2020-12-28 | 2021-04-20 | 北京理工大学 | Centrifugal air compressor for fuel cell system |
| CN112682345A (en) * | 2020-12-24 | 2021-04-20 | 北京理工大学 | Air compressor for hydrogen fuel cell system |
| CN112727927A (en) * | 2020-12-28 | 2021-04-30 | 北京理工大学 | Air bearing for air compressor of fuel cell system |
-
2020
- 2020-01-09 CN CN202020041897.3U patent/CN211370810U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112664470A (en) * | 2020-12-24 | 2021-04-16 | 北京理工大学 | High-speed air compressor convenient to heat dissipation |
| CN112682345A (en) * | 2020-12-24 | 2021-04-20 | 北京理工大学 | Air compressor for hydrogen fuel cell system |
| CN112682336A (en) * | 2020-12-28 | 2021-04-20 | 北京理工大学 | Centrifugal air compressor for fuel cell system |
| CN112727927A (en) * | 2020-12-28 | 2021-04-30 | 北京理工大学 | Air bearing for air compressor of fuel cell system |
| CN112727927B (en) * | 2020-12-28 | 2021-11-02 | 北京理工大学 | Air bearing for air compressor of fuel cell system |
| CN112682336B (en) * | 2020-12-28 | 2022-06-14 | 北京理工大学 | Centrifugal air compressor for fuel cell system |
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