Radial dynamic pressure gas bearings, compressors and air conditioning units

Abstract

The present invention relates to a radial dynamic pressure gas bearing, a compressor and an air conditioning unit, wherein the radial dynamic pressure gas bearing comprises a bearing housing (10), a bump foil (20) and a top foil (30), the bump foil (20) being arranged between the bearing housing (10) and the top foil (30), a cavity (40) being provided between the inner wall of the bearing housing (10) and the bump foil (20), and the bearing housing (10) being provided with a ventilation channel, the ventilation channel being used to introduce gas into the cavity (40). The compressor comprises a radial dynamic pressure gas bearing. The air conditioning unit comprises a compressor. The present invention can introduce gas into the cavity between the inner wall of the bearing housing and the bump foil through the ventilation channel arranged on the bearing housing, and the stiffness of the bump foil can be adjusted by the introduced gas, so that the bearing can better adapt to the vibration of the rotor, thereby improving the stability of the compressor using the bearing during operation.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a radial dynamic pressure gas bearing, a compressor and an air conditioning unit. Background Art

[0002] The foil dynamic pressure gas suspension centrifugal compressor uses the force generated by the dynamic pressure effect of the gas bearing during high-speed rotation to support the rotor suspension. The compressor can achieve oil-free and friction-free operation, the bearings have no mechanical power consumption, and the complex oil circuit system can be eliminated. It also avoids the friction between the lubricating oil and the high-speed shaft, reducing friction losses. The compressor has a simple structure, high efficiency and easy maintenance.

[0003] However, in actual use, the dynamic pressure air suspension compressor is subjected to complex forces during startup and operation, which can easily cause unstable vibration of the rotor. The stiffness of the bearing cannot adapt to the vibration of the rotor. The rotor will still rub against the bearing at certain stages, affecting the service life of the rotor and bearings.

[0004] It should be noted that the information disclosed in the background technology section of the present invention is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes prior art already known to those skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide a radial dynamic pressure gas bearing, a compressor and an air conditioning unit to improve the adaptability of the bearing to rotor vibration.

[0006] To achieve the above object, the present invention provides a radial dynamic pressure gas bearing, comprising:

[0007] Bearing housing;

[0008] Top foil; and

[0009] The corrugated foil is arranged between the bearing shell and the top foil, and a cavity is provided between the inner wall of the bearing shell and the corrugated foil. The bearing shell is provided with a ventilation channel, and the ventilation channel is used to introduce gas into the cavity.

[0010] In some embodiments, the ventilation channel includes a ventilation hole that radially penetrates the bearing housing.

[0011] In some embodiments, the ventilation channel includes a plurality of ventilation holes, and the plurality of ventilation holes are arranged along the axial direction and / or the circumferential direction of the bearing housing.

[0012] In some embodiments, the wave foil includes a first wave band and a second wave band, the first wave band contacts the inner wall of the bearing housing, the second wave band protrudes 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, and the vent hole is connected to the cavity.

[0013] In some embodiments, the vent hole is disposed in a middle portion of a portion of the bearing housing corresponding to the second band.

[0014] In some embodiments, the ventilation channel includes a ventilation groove extending along the axial direction of the bearing housing, and the ventilation hole is in communication with the ventilation groove.

[0015] In some embodiments, the ventilation groove is disposed on a side of the bearing housing away from the bump foil.

[0016] In some embodiments, the cavity is in communication with the space between the bump foil and the top foil.

[0017] To achieve the above object, the present invention also provides a compressor, comprising the above radial dynamic pressure gas bearing.

[0018] In some embodiments, a delivery channel is provided in the compressor, the delivery channel is connected to the ventilation channel for delivering gas to the ventilation channel, and a regulating valve is provided on the delivery channel.

[0019] To achieve the above object, the present invention also provides an air conditioning unit, comprising the above compressor.

[0020] In some embodiments, the air conditioning unit further includes a refrigerant delivery pipe, which is connected to the ventilation channel.

[0021] In some embodiments, the air conditioning unit further includes a booster pump, and an air outlet of the booster pump is connected to the ventilation channel.

[0022] Based on the above technical solution, in the embodiment of the present invention, a ventilation channel is provided on the bearing shell, through which gas can be introduced into the cavity between the inner wall of the bearing shell and the corrugated foil. The introduced gas can adjust the stiffness of the corrugated foil and change the pressure resistance of the corrugated foil, so that the bearing can better adapt to the vibration of the rotor and improve the stability of the compressor using the bearing of the embodiment of the present invention during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 It is a schematic structural diagram of an embodiment of a radial dynamic pressure gas bearing of the present invention.

[0025] Figure 2 It is a stereoscopic diagram of an embodiment of a radial dynamic pressure gas bearing of the present invention.

[0026] Figure 3 It is a stereoscopic view of another embodiment of the radial dynamic pressure gas bearing of the present invention.

[0027] Figure 4 It is a partial structural schematic diagram of an embodiment of a compressor of the present invention.

[0028] Figure 5 It is a partial structural schematic diagram of another embodiment of the compressor of the present invention.

[0029] Figure 6 This is a partial structural schematic diagram of another embodiment of a compressor of the present invention.

[0030] In the figure:

[0031] 10. Bearing housing; 11. Vent hole; 12. Vent groove; 13. Gap; 20. Corrugated foil; 30. Top foil; 40. Cavity; 50. Delivery channel; 60. Regulating valve; 70. Bearing support; 80. Rotor; 90. Stator; 100. Motor housing; 110. Refrigerant delivery pipe; 120. Booster pump. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0034] In order to adapt to the complex force process of the rotor and improve the stability of the rotor operation, the inventors have found through research that the stiffness characteristics of the bearing can be changed according to the vibration characteristics of the rotor during the operation of the rotor so that the bearing can adapt to the vibration of the rotor.

[0035] Based on the above ideas, the inventors have improved the bearing structure. Figure 1 and Figure 2As shown, in one embodiment of the radial dynamic pressure 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 arranged between the bearing housing 10 and the top foil 30, and a cavity 40 is provided between the inner wall of the bearing housing 10 and the bump foil 20, and the bearing housing 10 is provided with a ventilation channel, which is used to introduce gas into the cavity 40.

[0036] In the above embodiment, a ventilation channel is provided on the bearing housing 10, through which gas can be introduced into the cavity 40 between the inner wall of the bearing housing 10 and the bump foil 20. The introduced gas can adjust the stiffness of the bump foil 20 and change the pressure resistance of the bump foil 20, so that the bearing can better adapt to the vibration of the rotor and improve the stability of the compressor using the bearing of the embodiment of the present invention during operation.

[0037] The bearing housing 10 is cylindrical in shape, has a circular cross section, is hollow in the middle, and the rotor is disposed in a central through hole of the bearing housing 10 .

[0038] There are many options for the specific structural form of the ventilation channel.

[0039] like Figure 1 and Figure 2 As shown, the ventilation channel includes ventilation holes 11, and the ventilation holes 11 radially penetrate the bearing housing 10. Through the ventilation holes 11, gas can be guided from the outside of the bearing housing 10 to the inside.

[0040] The ventilation channel may include a plurality of ventilation holes 11 , and the plurality of ventilation holes 11 may be arranged along the axial direction and / or the circumferential direction of the bearing housing 10 .

[0041] like Figure 1 As shown, a plurality of vent holes 11 are arranged along the circumference of the bearing housing 10. Some of the vent holes 11 are arranged at even intervals.

[0042] like Figure 2 As shown, a plurality of ventilation holes 11 are evenly arranged along the axial direction of the bearing housing 10 , and are arranged in a plurality of rows along the circumferential direction.

[0043] The bump foil 20 includes a first band and a second band, the first band contacts the inner wall of the bearing housing 10, the second band protrudes away from the inner wall of the bearing housing 10 to form a cavity 40 between the second band and the inner wall of the bearing housing 10, and the vent hole 11 is connected to the cavity 40.

[0044] The shape of the second wave band protruding in the direction away from the inner wall of the bearing housing 10 may be semicircular or arched.

[0045] The vent hole 11 is arranged in the middle of the portion corresponding to the second band of the bearing housing 10. This arrangement can ensure that the vent hole 11 is away from the position of the bearing housing 10 that contacts the first band, so that the vent hole 11 is not covered by the first band, and ensure that the gas flowing out of the vent hole 11 can smoothly enter the cavity 40.

[0046] The axis of the vent hole 11 can be colinear with the point of the cavity 40 farthest from the inner wall of the bearing housing 10, which can further ensure that the vent hole 11 is away from the position of the bearing housing 10 that contacts the first band, so that the vent hole 11 is not covered by the first band.

[0047] like Figure 3 As shown, the ventilation channel may further include a ventilation groove 12 , the ventilation groove 12 extends along the axial direction of the bearing housing 10 , and the ventilation hole 11 is in communication with the ventilation groove 12 .

[0048] By providing the ventilation groove 12, multiple ventilation holes 11 can be connected simultaneously along the axial direction, so that when the gas is passed into the ventilation groove 12, it can reach multiple ventilation holes 11, and there is no need to connect each ventilation hole 11 to the gas supply source separately, which is conducive to simplifying the layout of the connecting pipeline.

[0049] The ventilation groove 12 is disposed on a side of the bearing housing 10 away from the bump foil 20 , so as to facilitate the communication between the ventilation groove 12 and an air supply source.

[0050] The cavity 40 is interconnected with the space between the bump foil 20 and the top foil 30 , so that the gas introduced into the cavity 40 can also flow into the space between the bump foil 20 and the top foil 30 to increase the rigidity of the top foil 30 and change the pressure resistance of the top foil 30 .

[0051] Based on the above-mentioned radial dynamic pressure gas bearing, the present invention also proposes a compressor, which includes the above-mentioned radial dynamic pressure gas bearing.

[0052] like Figure 4 As shown, a delivery channel 50 is provided in the compressor, and the delivery channel 50 is connected with the ventilation channel for delivering gas to the ventilation channel. A regulating valve 60 is provided on the delivery channel 50 .

[0053] The delivery channel 50 can be arranged on the motor housing 100 and the bearing support 70. By setting the regulating valve 60, the pressure of the gas delivered by the delivery channel 50 can be adjusted, thereby adjusting the rigidity 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.

[0054] Based on the above compressor, the present invention also proposes an air conditioning unit, which includes the above compressor.

[0055] like Figure 5As shown, the air conditioning unit further includes a refrigerant delivery pipe 110, which is connected to the ventilation channel. In this way, the refrigerant in the air conditioning unit can be used to adjust the stiffness of the corrugated foil 20 and the top foil 30, thereby improving the utilization value of the refrigerant and saving the cost of setting up an external air supply source.

[0056] Specifically, the refrigerant in the refrigerant delivery pipe 110 may come from the exhaust port of the compressor, or from a condenser or other location.

[0057] The refrigerant delivery pipe 110 may be directly connected to the ventilation channel, or may be indirectly connected to the ventilation channel through the delivery channel 50 .

[0058] like Figure 6 As shown, the air conditioning unit may further include a booster pump 120, and the air outlet of the booster pump 120 is connected to the ventilation channel. By providing the booster pump 120, high-pressure gas can be delivered to the ventilation channel. Compared with using the refrigerant in the air conditioning unit, the scheme of providing the booster pump 120 is more convenient to control the pressure of the introduced gas, has a higher degree of freedom, and does not lose the refrigeration capacity of the air conditioning unit. Moreover, when the compressor is in the startup stage, when the pressure difference between the inlet and outlet of the compressor has not yet been established, the booster pump 120 can be used to provide gas to be introduced into the ventilation channel, avoiding the problem that the gas cannot be introduced normally due to the lack of pressure difference, and solving the problem that the stiffness of the bearing cannot be adjusted during the startup stage of the compressor.

[0059] The positive technical effects of the radial dynamic pressure gas bearings in the above-mentioned embodiments are also applicable to compressors and air-conditioning units, which will not be described in detail here.

[0060] The following is combined with Figures 1 to 6 The structure of an embodiment of the radial dynamic pressure gas bearing of the present invention and the structure of a compressor using the radial dynamic pressure gas bearing are described in detail:

[0061] like Figure 1 As shown, the radial dynamic pressure gas bearing comprises a bearing housing 10, a bump foil 20 and a top foil 30, wherein the bump foil 20 is located between the bearing housing 10 and the top foil 30. The top foil 30 is a cylindrical shape formed by bending a sheet foil, and a gap 13 is formed at the butt joint of both ends, and the circumferential direction of the top foil 30 is continuous. One end of the top foil 30 is fixed on the bearing housing 10, and the other end is a free end.

[0062] The bump foil 20 is a segmented structure, including three segments in total. 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 segment of the bump foil 20 includes a plurality of first segments and a plurality of second segments, and the first segments and the second segments are arranged alternately. The first segment contacts the inner wall of the bearing housing 10, and the second segment protrudes in a direction 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.

[0063] The bearing housing 10 is provided with a plurality of vent holes 11, which are connected to the cavity 40, and the vent holes 11 correspond to the cavity 40 one by one, and the number of the vent holes 11 is equal to the number of the cavity 40. Moreover, the vent holes 11 are opened in the middle of the portion of the bearing housing 10 corresponding to the second band.

[0064] like Figure 2 As shown, a plurality of vent holes 11 are evenly arranged along the axial direction on the bearing housing 10 , and are arranged in a plurality of rows along the circumferential direction.

[0065] like Figure 3 As shown, the outer side of the bearing housing 10 is further provided with a plurality of ventilation grooves 12 extending in the axial direction, and the ventilation holes 11 are opened at the bottom of the ventilation grooves 12 .

[0066] like Figure 4 As shown, 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 support 70 is connected to the motor housing 100. The two bearing supports 70 are respectively located at both ends of the motor housing 100, and the two radial dynamic pressure gas bearings are respectively installed on the corresponding bearing supports 70.

[0067] The radial dynamic pressure gas bearing comprises a bearing housing 10, a wave foil 20 and a top foil 30. The rotor 80 is inserted into the central through hole of the bearing housing 10 and is located on the inner side of the top foil 30. An air film gap is formed between the top foil 30 and the rotor 80. When the compressor is running, gas enters the air film gap to form a dynamic pressure air film, so that the rotor is suspended.

[0068] The motor housing 100 and the bearing support 70 are both provided with a delivery channel 50 , and the delivery channel 50 is provided with a regulating valve 60 .

[0069] like Figure 5 As shown, the compressor further includes a refrigerant delivery pipe 110 , in which there is a refrigerant participating in a refrigeration or heating cycle. The refrigerant delivery pipe 110 is connected to the delivery channel 50 , and the delivery channel 50 is connected to the vent hole 11 .

[0070] like Figure 6 As shown, the compressor further includes a booster pump 120 , which is used to provide high-pressure gas. The booster pump 120 is connected to the delivery channel 50 through a delivery pipe, and the delivery channel 50 is connected to the vent hole 11 .

[0071] In other embodiments, a refrigerant delivery pipe 110 and a booster pump 120 connected to the delivery channel 50 may be simultaneously provided in the compressor. In this way, when the compressor is just started, the booster pump 120 can provide gas to pass into the ventilation channel to adjust the stiffness of the bearing; when the compressor is working normally, the high-pressure side gas (i.e., refrigerant) of the unit itself can be used to input into the ventilation channel after passing through the regulating valve to adjust the stiffness of the bearing, thereby realizing variable stiffness of the bearing and improving the anti-interference ability of the compressor during operation.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that without departing from the principles of the present invention, the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents, and these modifications and equivalent replacements should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A radial dynamic pressure gas bearing, characterized in that: include: Bearing housing (10); a top foil (30); and A bump foil (20) is arranged between the bearing housing (10) and the top foil (30), and a cavity (40) is provided between the inner wall of the bearing housing (10) and the bump foil (20), and the bearing housing (10) is provided with a ventilation channel, and the ventilation channel is used to introduce gas into the cavity (40); The ventilation channel comprises a ventilation hole (11), and the ventilation hole (11) penetrates the bearing housing (10) in a radial direction; The ventilation channel comprises a ventilation groove (12), the ventilation groove (12) extending along the axial direction of the bearing housing (10), and the ventilation hole (11) is in communication with the ventilation groove (12); The cavity (40) is in communication with the space between the bump foil (20) and the top foil (30).

2. The radial dynamic pressure gas bearing according to claim 1, characterized in that: The ventilation channel comprises a plurality of ventilation holes (11), and the plurality of ventilation holes (11) are arranged along the axial direction and / or the circumferential direction of the bearing housing (10).

3. The radial dynamic pressure gas bearing according to claim 1, characterized in that: The wave foil (20) comprises a first wave band and a second wave band, the first wave band is in contact with the inner wall of the bearing housing (10), the second wave band protrudes in a direction 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), and the vent hole (11) is in communication with the cavity (40).

4. The radial dynamic pressure gas bearing according to claim 3, characterized in that: The vent hole (11) is arranged in the middle of a portion of the bearing housing (10) corresponding to the second wave band.

5. The radial dynamic pressure gas bearing according to claim 1, characterized in that: The ventilation groove (12) is arranged on a side of the bearing housing (10) away from the bump foil (20).

6. A compressor, characterized in that: It comprises a radial dynamic pressure gas bearing as described in any one of claims 1 to 5.

7. The compressor according to claim 6, characterized in that A delivery channel (50) is provided in the compressor, the delivery channel (50) being in communication with the ventilation channel for delivering gas to the ventilation channel, and a regulating valve (60) is provided on the delivery channel (50).

8. An air conditioning unit, characterized in that: Comprising a compressor as claimed in claim 6 or 7.

9. The air conditioning unit according to claim 8, characterized in that: It also includes a refrigerant delivery pipe (110), wherein the refrigerant delivery pipe (110) is in communication with the ventilation channel.

10. The air conditioning unit according to claim 8, characterized in that: It also includes a booster pump (120), wherein an air outlet of the booster pump (120) is in communication with the ventilation channel.

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