Axial partition type tangential circulation air suspension bearing and compressor

Abstract

The invention discloses an axial partition type tangential circulation air suspension bearing and a compressor, and belongs to the technical field of air suspension bearings, the axial partition type tangential circulation air suspension bearing comprises an air suspension bearing seat, a rotating shaft, a sealing cover and a partition plate, the partition plate is assembled in the air suspension bearing seat so as to axially divide an inner cavity of the air suspension bearing seat into an air inlet section cavity and an air outlet section cavity, the cavity wall of the air inlet section cavity and the cavity wall of the air outlet section cavity are separated from the rotating shaft to form air film gaps; an annular air inlet flow channel and a plurality of tangential introduction channels communicated with the annular air inlet flow channel are arranged in the air inlet section cavity, and the other ends of the tangential introduction channels are communicated to the air film gap; the air outlet section cavity is provided with an annular air outlet flow channel and a plurality of tangential leading-out channels of the annular air outlet flow channel, and the other ends of the tangential leading-out channels are all communicated to the air film gap. By adopting the air suspension bearing, the technical problems that film forming is difficult, air film stability is poor due to cross interference of inlet and exhaust flow fields, and an air film medium is easily mixed with main circulating fluid of a compressor to cause pollution are solved.

Description

Technical Field

[0001] This invention relates to the field of air suspension bearing technology, and in particular to an axially partitioned tangential circulating air suspension bearing and compressor. Background Technology

[0002] In the field of high-speed rotating machinery, the core advantages of air suspension bearings, namely no friction and no oil pollution, have been widely recognized. In order to improve the performance of air film support, related technologies have explored solutions such as tangential air supply and phase change fluid film formation. For example, some technologies use tangential flow channels to make the fluid injection direction coordinate with the shaft rotation.

[0003] However, existing technologies still have significant drawbacks. Traditional tangential air supply schemes, due to the lack of complete physical isolation between intake and exhaust functions, are prone to cross-interference, vortices, and pressure disturbances in the flow field, severely affecting the stability and load-bearing efficiency of the gas film. Existing electrothermal phase change schemes rely on additional electrothermal phase change drive devices and centrifugal suction devices to achieve fluid circulation, which not only increases energy consumption but also makes the system structure more complex. At the same time, existing schemes either directly use low-viscosity working fluids such as carbon dioxide to form a film themselves, which is difficult to form a sufficiently rigid gas film due to insufficient viscosity, or there is a risk of mixing between the gas film fluid and the main circulating working fluid, making it impossible to effectively adapt to low-viscosity working fluid compressors, thus restricting the efficiency improvement and large-scale application of the equipment. Summary of the Invention

[0004] The purpose of this invention is to provide an axially partitioned tangential circulating air suspension bearing and compressor to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides an axially partitioned tangential circulating air suspension bearing, comprising an air suspension bearing housing, a rotating shaft, and caps corresponding to both ends of the air suspension bearing housing, and further comprising: A partition is provided, which is a closed ring assembly inside the air suspension bearing housing, and its edge end is sealed to the inner wall of the air suspension bearing housing, so as to axially divide the inner cavity of the air suspension bearing housing into an air intake section chamber and an air outlet section chamber that are isolated from each other and work independently. The cavity walls of the air intake section chamber and the cavity walls of the air outlet section chamber are both spaced apart from the rotating shaft to form an air film gap. The air intake chamber is provided with an annular air intake channel communicating with the outside and multiple tangential inlet channels communicating with the annular air intake channel. The other end of each of the multiple tangential inlet channels is connected to the air film gap, which is used to inject the working medium into the air film gap in the same direction as the rotation of the rotating shaft. The outlet section chamber is provided with an annular outlet air passage communicating with the outside and multiple tangential outlet channels communicating with the annular outlet air passage. The other end of each of the multiple tangential outlet channels is connected to the air film gap, which is used to throw the working medium in the air film gap out in a tangential direction and merge it into the annular outlet air passage so as to be discharged from the outlet section chamber.

[0006] Preferably, the outer wall of the air suspension bearing housing is provided with an air inlet and an air outlet corresponding to the air inlet section chamber and the air outlet section chamber, respectively.

[0007] Preferably, it further includes tangential flow guiding inserts. The inner circumferential walls of the intake section chamber and the outlet section chamber are respectively provided with a plurality of wedge-shaped grooves I and a plurality of wedge-shaped grooves II spaced apart circumferentially. The tangential flow guiding inserts include tangential inlet inserts and tangential outlet inserts. There are multiple tangential inlet inserts, which are correspondingly mounted on the wedge-shaped grooves I, and a tangential inlet channel is formed between two adjacent tangential inlet inserts. There are multiple tangential outlet inserts, which are correspondingly mounted on the wedge-shaped grooves II, and a tangential outlet channel is formed between two adjacent tangential outlet inserts.

[0008] Preferably, the extension directions of the tangential inlet channel and the tangential outlet channel are both consistent with the circumferential tangent direction of the rotating shaft, and the tangential direction of the tangential inlet channel is the same as the rotation direction of the rotating shaft, while the tangential direction of the tangential outlet channel is opposite to the rotation direction of the rotating shaft.

[0009] Preferably, the axial thickness of the tangential insertion plug is greater than the axial thickness of the tangential exit plug.

[0010] Preferably, the working medium is a high-viscosity phase change fluid.

[0011] Preferably, the cover corresponds to the air inlet section chamber and the air outlet section chamber as an air inlet end cover and an air outlet end cover, respectively. The air inlet end cover is a closed cover structure, and the air outlet end cover is provided with a through hole for the rotating shaft to pass through, and a sealing device is provided at the through hole.

[0012] Preferably, a compressor includes the aforementioned axially partitioned tangential circulating air suspension bearing.

[0013] Preferably, the compressor is a carbon dioxide compressor, the working fluid of the carbon dioxide compressor is carbon dioxide, and the working medium located in the axial partitioned tangential circulating air suspension bearing is a high-viscosity phase change fluid independent of carbon dioxide.

[0014] Therefore, the present invention employs the above-mentioned axially partitioned tangential circulating air suspension bearing and compressor, which has the following beneficial effects: 1. The bearing housing cavity is axially divided into independent inlet and outlet chambers by an annular baffle. Combined with the annular inlet and outlet air channels and multiple tangential inlet and outlet channels, a directional internal circulation of the working medium is achieved, which is "tangential injection - axial passage through the air film - tangential ejection". This eliminates the cross interference between the inlet and outlet airflows, completely eliminates vortices and pressure disturbances in the flow field, and makes the air film flow field more stable. At the same time, the tangential inlet channel is aligned with the rotation direction of the rotating shaft, which greatly enhances the hydrodynamic pressure effect. The tangential outlet channel achieves efficient flow by means of the centrifugal force of the shaft rotation, without the need for an additional drive device. This not only improves the rigidity and load-bearing capacity of the air film, but also simplifies the circulation structure and reduces operating energy consumption.

[0015] 2. By assembling modular tangential inlet and tangential outlet inserts in the wedge-shaped grooves of the inner circumferential wall of the bearing housing, a regular tangential channel is directly formed between adjacent inserts, replacing the traditional complex spatial interlaced flow channel processing, which greatly reduces the processing accuracy requirements and manufacturing costs, while facilitating assembly and maintenance; moreover, the axial thickness of the tangential inlet insert is greater than that of the tangential outlet insert, which extends the air inlet film formation area, allowing the working medium to fully form a uniform, high-pressure supporting gas film, further optimizing the bearing's load-bearing performance and improving structural reliability.

[0016] 3. Using a high-viscosity phase change fluid independent of the compressor's working fluid as the gas film working medium completely eliminates the dependence on the film-forming characteristics of low-viscosity main working fluid, solving the problem of difficulty in forming a stable gas film when using low-viscosity working fluids such as carbon dioxide; at the same time, the inlet end adopts a closed cap, and the outlet end cap is equipped with a through hole with a sealing device. The double protection effectively avoids gas film fluid leakage and mixing with the main circulating working fluid, which not only ensures the independence and stability of the gas film circulation, but also eliminates problems such as pollution and carbon buildup caused by medium mixing, thus improving the long-term reliability of the equipment.

[0017] 4. The axial partitioned tangential circulation air suspension bearing is integrated into the compressor, especially for the operating conditions of carbon dioxide compressors. Through the synergy of independent high-viscosity phase change fluid film formation and efficient internal circulation, a high-performance and highly reliable bearing solution is provided for low-viscosity working fluid compressors. This not only overcomes the limitations of traditional air suspension bearings in low-viscosity working fluid compressors, such as insufficient load-bearing capacity and poor stability, but also improves the overall energy efficiency of the compressor by leveraging the advantages of frictionless and oil-free bearings. This provides core support for the large-scale and efficient application of equipment such as carbon dioxide refrigeration units.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 An axial cross-sectional view of an axially partitioned tangential circulating air suspension bearing provided by the present invention; Figure 2 An axial cross-sectional view of an axially partitioned tangential circulating air suspension bearing facing the air inlet end, provided by the present invention. Figure 3 This is an axial cross-sectional view of an axially partitioned tangential circulating air suspension bearing facing the outlet end, provided by the present invention.

[0020] Figure Labels 1. Air suspension bearing housing; 111. Annular air inlet channel; 112. Tangential inlet channel; 113. Wedge groove one; 121. Annular air outlet channel; 122. Tangential outlet channel; 123. Wedge groove two; 13. Air film gap; 14. Air inlet; 15. Air outlet; 161. Tangential inlet insert; 162. Tangential outlet insert; 2. Rotating shaft; 31. Air inlet end cover; 32. Air outlet end cover; 33. Sealing device; 4. Partition plate. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments of the present invention and are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of this application. Examples of embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0022] It should be noted that the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, such as a process, method, system, product, or server that includes a series of steps or units, not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or device.

[0023] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] While existing technologies have explored ways to improve the performance of air suspension bearings, such as tangential air supply and phase change fluid film formation, and some solutions attempt to achieve synergy between fluid and shaft rotation through tangential flow channels, these technologies still have key drawbacks: traditional tangential air supply solutions do not completely physically isolate the intake and exhaust functions, often integrating them in the same radial plane or circumferential region, leading to easy cross-interference, vortices, and pressure disturbances in the flow field, severely affecting the stability of the air film and load-bearing efficiency; the flow channel design is complex and requires high machining precision, and there are also problems such as uneven fluid distribution and large pressure loss. Moreover, some solutions rely on additional electrothermal phase change drive devices or centrifugal blades to achieve fluid circulation and discharge, which increases energy consumption and manufacturing costs, and also increases the risk of system failure; at the same time, for compressors with low-viscosity working fluids such as carbon dioxide, existing solutions either directly use the low-viscosity working fluid itself to form a film, which is difficult to form a sufficiently rigid air film due to insufficient viscosity, or cannot effectively avoid the mixing of the air film fluid with the main circulating working fluid, leading to the risk of contamination or carbon buildup. These problems together restrict the efficient and stable application of air suspension bearings in high-speed, high-load conditions and low-viscosity working fluid compressors.

[0025] Based on the above analysis, this invention is designed. (See appendix.) Figure 1-3 An axially partitioned tangential circulating air suspension bearing and compressor, comprising: an air suspension bearing housing 1, a rotating shaft 2, and caps corresponding to both ends of the air suspension bearing housing, and further comprising: The partition 4 is a closed ring assembly inside the air suspension bearing seat 1, and its edge end is sealed to the inner wall of the air suspension bearing seat 1 to axially divide the inner cavity of the air suspension bearing seat 1 into an air intake section chamber and an air outlet section chamber that are isolated from each other and work independently. The cavity walls of the air intake section chamber and the cavity walls of the air outlet section chamber are separated from the rotating shaft 2 to form an air film gap 13. The air intake section is provided with an annular air intake channel 111 that communicates with the outside and multiple tangential inlet channels 112 that communicate with the annular air intake channel 111. The other end of each of the multiple tangential inlet channels 112 is connected to the air film gap 13, which is used to inject the working medium into the air film gap 13 in the same direction as the rotation of the rotating shaft 2. The outlet section chamber is provided with an annular outlet air passage 121 that communicates with the outside and multiple tangential outlet channels 122 that communicate with the annular outlet air passage 121. The other end of the multiple tangential outlet channels 122 is connected to the air film gap 13, which is used to throw out the working medium in the air film gap 13 in the tangential direction and merge it into the annular outlet air passage 121 so as to be discharged from the outlet section chamber.

[0026] In a specific embodiment of the air suspension bearing housing 1 of this invention, an air inlet 14 and an air outlet 15 are respectively provided on the outer wall of the air suspension bearing housing 1 corresponding to the air inlet section chamber and the air outlet section chamber. The separate air inlet 14 and air outlet 15 on the outer wall of the air suspension bearing housing 1 enable precise and independent connection between the external fluid transport and recovery system and the annular air inlet and outlet channels inside the bearing. This ensures the continuity of the directional circulation of the high-viscosity phase change fluid, avoids mutual interference between the air inlet and outlet flows at the external interface, simplifies the layout and assembly process of external pipelines, and facilitates subsequent processing such as centralized cooling and pressurization of the circulating medium. Combined with the axial partitioning and tangential channel design inside the bearing, this further reduces the risk of fluid leakage, ensures the stable pressure and flow supply required for gas film formation, and improves the reliability and ease of maintenance of the bearing operation.

[0027] In the above embodiment, a tangential flow guide is also included. The inner circumferential walls of the intake section chamber and the exhaust section chamber are respectively provided with a plurality of wedge-shaped grooves 113 and a plurality of wedge-shaped grooves 123 spaced apart in the circumferential direction. The tangential flow guide includes a tangential inlet plug 161 and a tangential outlet plug 162. There are multiple tangential inlet plugs 161 and they are correspondingly assembled on the wedge-shaped grooves 113. A tangential inlet channel 112 is formed between two adjacent tangential inlet plugs 161. There are multiple tangential outlet plugs 162 and they are correspondingly assembled on the wedge-shaped grooves 123. A tangential outlet channel 122 is formed between two adjacent tangential outlet plugs 162. The tangential guide insert 161 is fitted onto the wedge-shaped groove 113 on the circumferential wall of the intake section chamber, and the tangential exit insert 162 is fitted onto the wedge-shaped groove 123 on the circumferential wall of the outlet section chamber. Utilizing the precise positioning references provided by the wedge-shaped grooves 113 and 123, the tangential guide insert 161 and the tangential exit insert 162 are quickly assembled and securely fixed. Furthermore, a regular tangential guide channel 112 is naturally formed between adjacent tangential guide inserts 161, and adjacent tangential guide inserts 162... The orderly tangential outlet channels 122 are naturally formed between the outlet plugs 162, eliminating the need for complex flow channel milling, which greatly reduces the processing difficulty and manufacturing cost. At the same time, the modular plug design facilitates subsequent maintenance and replacement. The orderly tangential inlet channels 112 and tangential outlet channels 122 can ensure that the high viscosity phase change fluid flows stably in the preset tangential direction, forming an efficient synergy with the rotation of the rotating shaft 2, further improving the uniformity and rigidity of the gas film in the gas film gap 13, and enhancing the bearing's load-bearing performance and operational reliability.

[0028] In the above embodiments, the extension directions of the tangential inlet channel 112 and the tangential outlet channel 122 are both consistent with the circumferential tangent direction of the rotating shaft 2, and the tangential direction of the tangential inlet channel 112 is the same as the rotation direction of the rotating shaft 2, while the tangential direction of the tangential outlet channel 122 is opposite to the rotation direction of the rotating shaft 2. The extension directions of both the tangential inlet channel 112 and the tangential outlet channel 122 are consistent with the circumferential tangential direction of the rotating shaft 2. Furthermore, the tangential direction of the tangential inlet channel 112 is the same as the rotation direction of the rotating shaft 2. This allows the high-viscosity phase change fluid to obtain initial kinetic energy in coordination with the rotation of the rotating shaft 2 when injected into the gas film gap 13, greatly enhancing the hydrodynamic pressure effect and helping to quickly form a uniform, high-pressure rigid gas film. On the other hand, the tangential direction of the tangential outlet channel 122 is opposite to the rotation direction of the rotating shaft 2. It can form efficient drainage by utilizing the centrifugal force generated by the rotation of the rotating shaft 2 and the fluid flow inertia, accelerating the fluid that has completed its work in the gas film gap 13 to quickly flow into the annular outlet channel 121. This avoids flow field disturbance caused by fluid stagnation and eliminates the need for additional suction devices. This not only improves fluid circulation efficiency but also enhances the stability of the gas film and the bearing load-bearing capacity, further reducing operating energy consumption and system complexity.

[0029] In the above embodiment, the axial thickness of the tangential inlet plug 161 is greater than the axial thickness of the tangential outlet plug 162. This greater axial thickness provides a longer film-forming area for the high-viscosity phase change fluid within the inlet chamber, allowing the fluid to fully coordinate with the rotation of the rotating shaft 2 within the gas film gap 13, gradually establishing a uniform and high-pressure rigid gas film, effectively improving the bearing's load-bearing capacity and gas film stability. Simultaneously, the thinner design of the tangential outlet plug 162 makes the drainage area of ​​the outlet chamber more compact. Combined with the counter-rotating design of the tangential outlet channel 122, this accelerates the rapid flow of the fluid completing its work within the gas film gap 13 into the annular outlet channel 121, avoiding flow field interference caused by fluid stagnation, further optimizing circulation efficiency, balancing gas film formation quality and fluid discharge efficiency, and improving the overall operational reliability of the bearing.

[0030] In the above embodiments, the working medium is a high-viscosity phase change fluid. The high viscosity of the working medium allows for the rapid formation of a supportive gas film with sufficient thickness and rigidity within the gas film gap 13, effectively resisting the radial load during high-speed rotation of the rotating shaft 2 and ensuring the stability of the bearing's non-contact suspension. Simultaneously, its phase change characteristics enable it to perfectly adapt to the directional circulation path formed by the annular inlet channel 111, the tangential inlet channel 112, the annular outlet channel 121, and the tangential outlet channel 122. Throughout the injection, gas film passage, and ejection process, it maintains a stable flow state and film-forming performance, completely eliminating dependence on the film-forming characteristics of the compressor's low-viscosity working fluid. This avoids gas film instability caused by insufficient medium viscosity and prevents mixing with the main circulating fluid, eliminating the risk of contamination and carbon buildup, and significantly improving the operational reliability and service life of the bearing and the corresponding compressor.

[0031] In a specific embodiment of the present invention, the inlet end cover 31 and the outlet end cover 32 correspond to the inlet section chamber and the outlet section chamber, respectively. The inlet end cover 31 is a closed cover structure, and the outlet end cover 32 has a through hole for the rotating shaft 2 to pass through, and a sealing device 33 is provided at the through hole. The closed cover structure of the inlet end cover 31 can firmly block the axial leakage of the high-viscosity phase change fluid in the gas film gap 13, providing a stable pressure environment for the formation and maintenance of the gas film in the inlet section chamber. The through hole of the outlet end cover 32 is precisely adapted to the installation and high-speed rotation requirements of the rotating shaft 2. The sealing device 33 at its through hole can not only effectively prevent the gas film working medium from leaking out, but also reliably isolate external impurities from the compressor's main circulation fluid, avoiding the mixing of the gas film medium with it and causing pollution or performance interference. This specific structural design, through differentiated sealing protection of the inlet and outlet ends, combined with the axial partitioning and tangential circulation design inside the bearing, ensures continuous and stable directional circulation, significantly improving the sealing performance, safety, and long-term reliability of the bearing operation.

[0032] Specifically, a compressor includes the aforementioned axially partitioned tangential circulating air suspension bearing. The compressor integrates the axially partitioned tangential circulating air suspension bearing, utilizing the high-rigidity supporting air film formed by the high-viscosity phase change fluid within the air film gap 13 to achieve frictionless, high-speed, and stable rotation of the rotating shaft 2, significantly reducing the compressor's operating energy consumption and mechanical losses.

[0033] In the above embodiments, the compressor is a carbon dioxide compressor, the working fluid of the carbon dioxide compressor is carbon dioxide, and the working medium located in the axially partitioned tangential circulating air suspension bearing is a high-viscosity phase change fluid independent of carbon dioxide. The working fluid of the carbon dioxide compressor is carbon dioxide. The working medium in the axially partitioned tangential circulation air suspension bearing is a high-viscosity phase change fluid independent of carbon dioxide, which completely eliminates the industry bottleneck that low-viscosity carbon dioxide is difficult to form a stable supporting gas film. With the coordinated design of the tangential introduction channel 112 and the rotating shaft 2 rotating in the same direction, a high-rigidity and uniform supporting gas film can be quickly formed in the gas film gap 13, ensuring the high-speed and stable rotation of the rotating shaft 2. Combined with the axial partitioned structure of the inlet section chamber and the outlet section chamber, as well as the directional circulation path formed by the annular inlet channel 111, the tangential introduction channel 112, the annular outlet channel 121, and the tangential outlet channel 122, the working medium flows efficiently without interfering with the main carbon dioxide circulation. At the same time, relying on the regular channel formed by the tangential introduction plug 161 and the tangential outlet plug 162 of the tangential flow guide plug, the gas film formation quality and circulation efficiency are further optimized, significantly improving the load-bearing capacity, operating stability and overall energy efficiency of the carbon dioxide compressor.

[0034] Specifically, the high-viscosity phase change fluid adapted to this carbon dioxide compressor is 500cs~1000cs methylphenyl silicone oil and pentaerythritol tetraoctanoate. The high viscosity of methylphenyl silicone oil allows it to quickly form a uniform and highly rigid supporting gas film when injected into the gas film gap 13 through the tangential introduction channel 112, perfectly compensating for the inability of low-viscosity CO2 to form a film. Its moderate volume expansion rate during phase change allows for stable pressure formation within the inlet chamber, and combined with the circulation path, efficient flow can be achieved without additional drive devices. Complete isolation from CO2, thanks to the sealing device 33 of the outlet end cap 32, prevents media mixing, avoids CO2 main circulation contamination or carbon buildup, and ensures the high-speed operation of the carbon dioxide compressor. It can operate stably for a long time under high-speed and high-pressure conditions, improving the overall energy efficiency of the unit. The high viscosity and wide temperature range phase change characteristics of pentaerythritol tetraoctanoate are suitable for the extreme temperature conditions of carbon dioxide compressors, ranging from -50℃ to 150℃. The gas film formed in the gas film gap 13 has both rigidity and toughness, which can effectively buffer the radial load of the rotating shaft 2. When liquid, it has moderate fluidity and can be evenly distributed to each tangential inlet channel 112 through the annular inlet channel 111. When gaseous, it is easily thrown out quickly by the tangential outlet channel 122, resulting in low circulation loss. Its environmental protection characteristics are in line with the green working fluid positioning of CO2 compressors. It does not react with CO2. With the axially partitioned inlet and outlet chambers, it ensures independent and stable gas film circulation and reduces equipment maintenance costs.

[0035] In addition, among other types of compressors, ammonia compressors can use polyetheretherketone (PEEK) based synthetic fluids, which have strong resistance to ammonia corrosion and a kinematic viscosity of 80~120 mmHg at 25°C. 2 / s, capable of forming a stable rigid gas film within the gas film gap 13, adaptable to the tangential circulation and axial partition structure of the bearing, avoiding mixing with the main ammonia circulation, resisting ammonia corrosion, and ensuring high-speed stable rotation of the rotating shaft 2; the propane compressor is compatible with hydrogenated benzyl silicone oil, which has good low-temperature phase change stability, can compensate for the insufficient film formation of propane at low viscosity, and is efficiently injected into the gas film gap 13 through the tangential introduction channel 112, achieving independent circulation with the sealing device 33, suitable for the low-temperature operating conditions of propane compressors for cold chain; the helium compressor uses perfluoropolyether oil, which has extremely strong chemical inertness and resistance to ultra-high pressure, and can cope with the extremely low viscosity and easy permeability of helium. The permeable properties form a dense supporting gas film in the gas film gap 13. With the help of the axial partition of the bearing and the regular channels of the tangential flow guide plug, the frictionless and stable operation of the ultra-high pressure helium compressor is ensured. The ethylene compressor can use alkyl naphthalene oil, which has a high viscosity index, high pressure resistance and is immiscible with ethylene. It can make up for the film-forming defects of low viscosity ethylene. It is evenly distributed to the tangential introduction channel 112 through the annular inlet air channel 111, forming an anti-interference gas film in the gas film gap 13. With the help of the sealing device 33, the ethylene and the gas film medium are isolated, avoiding the risk of carbon accumulation caused by the polymerization reaction, and ensuring the long-term reliable operation of the ethylene compressor under high pressure conditions.

[0036] The working principle of the axially partitioned tangential circulating air suspension bearing of the present invention is as follows: After the high-viscosity phase change fluid enters the annular inlet channel of the bearing housing through the inlet, it is directionally injected into the gas film gap through multiple tangential introduction channels in the same direction as the rotation of the rotating shaft. Under the synergistic effect of the initial kinetic energy of the fluid and the rotation of the shaft, a high-pressure, uniform, rigid support gas film is quickly formed, achieving non-contact suspension of the rotating shaft. Subsequently, the fluid that has completed its support function flows axially through the gas film gap to the outlet section under the combined action of the gas film pressure difference and the centrifugal force of the rotating shaft. It is then efficiently ejected through the tangential outlet channel in the opposite direction of the rotation of the rotating shaft, merges into the annular outlet channel, and is discharged from the outlet. After entering the external circulation system for cooling and pressurization, it is sent back to the inlet end to form a stable directional circulation. At the same time, the closed cap at the inlet end and the sealing device at the outlet end ensure the independence of the fluid circulation, avoid media leakage or mixing with the main circulation fluid of the compressor, and ensure the continuous and stable operation of the bearing.

[0037] In summary, this invention solves the problems of existing technologies, such as the difficulty in forming a stable supporting gas film with low-viscosity working fluids, the susceptibility of the gas film flow field to vortices and pressure fluctuations due to inlet and outlet interference, the complexity and high cost of flow channel processing, the easy mixing and contamination of the gas film medium and the compressor's main circulation fluid, and the high energy consumption of some solutions that rely on additional drive devices. It can not only quickly form a high-pressure, uniform, and rigid gas film to achieve frictionless, high-speed, and stable rotation of the rotating shaft, but also simplify the structural layout and processing and maintenance procedures, reduce manufacturing costs and operating energy consumption. At the same time, the differentiated sealing design ensures the independence and sealing of the medium circulation, significantly improving the load-bearing capacity, operational stability, and overall energy efficiency of various compressors, and providing core technical support for the large-scale and efficient application of low-viscosity working fluid compressors.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. An axially partitioned tangential circulating air suspension bearing, comprising an air suspension bearing housing (1), a rotating shaft (2), and caps corresponding to both ends of the air suspension bearing housing, characterized in that: Also includes: The partition (4) is a closed ring assembly inside the air suspension bearing seat (1), and its edge end is sealed to the inner wall of the air suspension bearing seat (1) to axially divide the inner cavity of the air suspension bearing seat (1) into an air intake section chamber and an air outlet section chamber that are isolated from each other and work independently. The cavity wall of the air intake section chamber and the cavity wall of the air outlet section chamber are both spaced apart from the rotating shaft (2) to form an air film gap (13). The air intake chamber is provided with an annular air intake channel (111) that communicates with the outside and multiple tangential inlet channels (112) that communicate with the annular air intake channel (111). The other end of each of the multiple tangential inlet channels (112) is connected to the air film gap (13) for injecting the working medium into the air film gap (13) in the same direction as the rotation of the rotating shaft (2). The outlet section chamber is provided with an annular outlet air passage (121) communicating with the outside and multiple tangential outlet channels (122) communicating with the annular outlet air passage (121). The other end of each of the multiple tangential outlet channels (122) is connected to the gas film gap (13) to throw the working medium in the gas film gap (13) out in the tangential direction and merge into the annular outlet air passage (121) so as to be discharged from the outlet section chamber.

2. The axially partitioned tangential circulating air suspension bearing according to claim 1, characterized in that: An air inlet (14) and an air outlet (15) are respectively provided on the outer wall of the air suspension bearing seat (1) corresponding to the air inlet section chamber and the air outlet section chamber.

3. The axially partitioned tangential circulating air suspension bearing according to claim 1, characterized in that: It also includes a tangential drainage insert, wherein the inner circumferential walls of the air intake section chamber and the air outlet section chamber are respectively provided with a plurality of wedge-shaped grooves one (113) and a plurality of wedge-shaped grooves two (123) spaced apart in the circumferential direction. The tangential drainage insert includes a tangential inlet insert (161) and a tangential outlet insert (162). There are multiple tangential inlet inserts (161) and they are respectively assembled on the plurality of wedge-shaped grooves one (113), and a tangential inlet channel (112) is formed between two adjacent tangential inlet inserts (161). There are multiple tangential outlet inserts (162) and they are respectively assembled on the plurality of wedge-shaped grooves two (123), and a tangential outlet channel (122) is formed between two adjacent tangential outlet inserts (162).

4. The axially partitioned tangential circulating air suspension bearing according to claim 3, characterized in that: The extension directions of the tangential inlet channel (112) and the tangential outlet channel (122) are both consistent with the circumferential tangent direction of the rotating shaft (2), and the tangential direction of the tangential inlet channel (112) is the same as the rotation direction of the rotating shaft (2), while the tangential direction of the tangential outlet channel (122) is opposite to the rotation direction of the rotating shaft (2).

5. The axially partitioned tangential circulating air suspension bearing according to claim 3, characterized in that: The axial thickness of the tangential lead-in plug (161) is greater than the axial thickness of the tangential lead-out plug (162).

6. The axially partitioned tangential circulating air suspension bearing according to claim 1, characterized in that: The working medium is a high-viscosity phase change fluid.

7. The axially partitioned tangential circulating air suspension bearing according to claim 1, characterized in that: The cover corresponds to the air inlet section chamber and the air outlet section chamber as an air inlet end cover (31) and an air outlet end cover (32), respectively. The air inlet end cover (31) is a closed cover structure. The air outlet end cover (32) is provided with a through hole for the rotating shaft (2) to pass through and a sealing device (33) is provided at the through hole.

8. A compressor, characterized in that, Including the axially partitioned tangential circulating air suspension bearing as described in any one of claims 1-7.

9. A compressor according to claim 8, characterized in that: The compressor is a carbon dioxide compressor, and the working fluid of the carbon dioxide compressor is carbon dioxide. The working medium located in the axial partitioned tangential circulating air suspension bearing is a high-viscosity phase change fluid independent of carbon dioxide.

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