Hydrodynamic gas foil bearings, compressors, air conditioners and automobiles

Abstract

The present disclosure relates to a dynamic pressure gas foil bearing, a compressor, an air conditioner and an automobile, wherein the dynamic pressure gas foil bearing comprises: a bearing seat; a top foil; and a support foil, which is located between the bearing seat and the top foil; wherein the bearing seat is provided with rigid support bosses on both sides of the support foil, which are configured to limit the top foil in the direction of pressing the support foil. By forming rigid support bosses on both sides of the bearing seat located at the support foil, the rigid support bosses limit the top foil in the direction of pressing the support foil, so as to control the deformation of the support foil, thereby making the deformation of the gas foil bearing foil controllable and adjustable, ensuring that even when it works in a huge impact and a strong gravity field, the foil only undergoes elastic deformation, thereby improving the accuracy of the dynamic pressure gas foil bearing operation, the stability and reliability of the operation, and the breadth of the operating conditions.

Description

Technical Field

[0001] The present disclosure relates to a dynamic pressure gas foil bearing, a compressor, an air conditioner and a car. Background Art

[0002] The statements herein merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] Gas-lubricated bearings use gas as a lubricating medium. Relying on the viscosity and compressibility of the gas, the fluid dynamic pressure effect and static pressure effect are used during the working process to form an air film that supports the load. At present, gas-lubricated bearings can be divided into dynamic pressure gas bearings, static pressure gas bearings and extrusion gas bearings according to the different processes of lubricating gas film generation. Gas lubrication technology has developed rapidly in the 1950s. Its emergence has greatly enriched the types of lubricated bearings. In particular, under working conditions with simple structures, few transmission parts and high speeds, traditional oil-lubricated sliding bearings are more likely to expose their problems such as excessive energy consumption, low linear speed and insufficient stability. Gas-lubricated bearings are often selected as an ideal replacement for traditional oil bearings due to their advantages such as low friction loss, good stability and low vibration. Especially in the field of ultra-high-speed rotating machinery technology, gas-lubricated bearings have a very broad application prospect.

[0004] However, the current hydrodynamic gas bearings or static gas bearings have certain limitations during use, and in most cases cannot meet the requirements of some complex and harsh working conditions. For example, the hydrodynamic gas bearing uses the wedge effect generated by the wedge space formed between the rotor and the bearing surface. As the rotor speed continues to increase, due to the viscosity of the gas, the surrounding gas is continuously dragged into the wedge space, so that the air pressure in the wedge space continues to increase. Only when the bearing speed reaches a certain value can a hydrodynamic gas film be formed and enter a stable gas lubrication state. Under the hydrodynamic effect, the higher the speed, the higher the bearing's load-bearing capacity. However, under some complex and harsh operating conditions with large impacts, such as the hydrodynamic bearings used in aircraft air cycle machines and the gas foil bearings in automotive fuel cell air compressors used in hydrogen fuel vehicles, due to the extremely large gravitational acceleration during aircraft acceleration and the instantaneous huge acceleration impact caused by changes in road conditions during vehicle operation, the top foil and wave foil positions at the contact point between the hydrodynamic foil bearing and the rotor are instantly subjected to huge impact forces several times or even dozens of times the gravity of the rotor, causing severe plastic deformation of the wave foil of the hydrodynamic gas foil bearing, thereby affecting the fit clearance between the rotor and the bearing, which will directly lead to a sharp decline in the operating accuracy and reliability of the gas bearing. Summary of the invention

[0005] One of the technical problems to be solved by the present disclosure is that the operating accuracy and working stability and reliability of the dynamic pressure gas foil bearing are not high. Based on this, the present disclosure provides a dynamic pressure gas foil bearing, a compressor, an air conditioner and a car, which can improve the operating accuracy, working stability and reliability of the dynamic pressure gas foil bearing and the breadth of operating conditions.

[0006] According to some embodiments of the present disclosure, a hydrodynamic gas foil bearing is provided, comprising: a bearing seat; a top foil; and a supporting foil located between the bearing seat and the top foil; wherein the bearing seat is provided with rigid supporting bosses on both sides of the supporting foil, which are configured to limit the top foil in the direction of compressing the supporting foil.

[0007] In some embodiments, two side edges of the top foil are respectively located above the rigid support bosses on both sides.

[0008] In some embodiments, the hydrodynamic gas foil bearing is a hydrodynamic gas foil radial bearing.

[0009] In some embodiments, the protruding height of the rigid supporting boss is 0.05 mm to 0.15 mm lower than the supporting height of the supporting bump foil.

[0010] In some embodiments, the distances from the two side edges of the supporting corrugated foil to the two side edges of the bearing seat along the axial direction are both 2.5 mm to 4.5 mm.

[0011] In some embodiments, the distances from both sides of the top foil to both sides of the bearing seat along the axial direction are 0.3 mm to 0.6 mm.

[0012] In some embodiments, the hydrodynamic gas foil bearing is a hydrodynamic gas foil axial bearing.

[0013] In some embodiments, the protruding height of the rigid supporting boss is 0.03 mm to 0.1 mm lower than the supporting height of the supporting bump foil.

[0014] In some embodiments, the corrugation height of the support corrugated foil is 0.3 mm to 0.6 mm, the corrugation diameter of the support corrugated foil is 4 mm to 5 mm, and the relative central angle between the same corresponding positions of two adjacent corrugated shapes in the support corrugated foil is 3.5° to 5.5°.

[0015] A compressor provided according to some embodiments of the present disclosure includes the aforementioned hydrodynamic gas foil bearing.

[0016] An air conditioner provided according to some embodiments of the present disclosure includes the aforementioned compressor.

[0017] According to some embodiments of the present disclosure, a car is provided, comprising the aforementioned compressor or the aforementioned air conditioner.

[0018] In the technical solution disclosed in the present invention, rigid supporting bosses are formed on both sides of the bearing seat to limit the top foil in the direction of compressing the supporting foil, so as to control the deformation of the supporting foil. Therefore, the deformation of the supporting foil does not completely depend on the strength and stiffness of the foil material itself or the size of the impact and gravity field, thereby making the deformation of the gas foil bearing foil controllable and adjustable, ensuring that even when it works in a huge impact and a strong gravity field, the foil only undergoes elastic deformation, and the bearing size remains normal when the strong impact disappears or the gravity field returns to normal, instead of permanent plastic deformation of the metal foil, which may cause abnormal operation of the gas foil bearing. This improves the operation accuracy of the dynamic pressure gas foil bearing, the stability and reliability of its operation, and the breadth of operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 and Figure 2 They are respectively a three-dimensional structural schematic diagram and a front view structural schematic diagram of some embodiments of the dynamic pressure gas foil bearing disclosed in the present invention;

[0021] Figure 3 yes Figure 2 A partial enlarged schematic diagram of the middle circle A part;

[0022] Figure 4 Schematic diagrams of cross-sectional structures of other embodiments of the dynamic pressure gas foil bearing disclosed in the present invention;

[0023] Figure 5 and Figure 6 They are respectively a three-dimensional structural schematic diagram and an exploded structural schematic diagram of other embodiments of the dynamic pressure gas foil bearing disclosed in the present invention;

[0024] Figure 7 is a schematic side view of the structure of other embodiments of the dynamic pressure gas foil bearing disclosed in the present invention;

[0025] Figure 8 yes Figure 7 A partial enlarged schematic diagram of part B in the middle circle.

[0026] Description of Reference Numerals

[0027] 1. Radial bearing seat; 2. Radial support corrugated foil; 3. Radial top foil; 4. Radial rigid support boss; 11. Axial bearing seat; 12. Axial support corrugated foil; 13. Axial top foil; 14. Axial rigid support boss. DETAILED DESCRIPTION

[0028] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0029] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0031] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0032] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0033] According to some embodiments of the present disclosure, a dynamic pressure gas foil bearing is provided, comprising: a bearing seat, a supporting wave foil and a top layer foil, wherein the supporting wave foil is located between the bearing seat and the top layer foil, and the bearing seat is provided with rigid supporting bosses on both sides of the supporting wave foil, which are configured to limit the top layer foil in the direction of compressing the supporting wave foil.

[0034] In this illustrative embodiment, rigid support bosses are formed on both sides of the bearing seat to limit the top foil in the direction of compressing the support foil, so as to control the deformation of the support foil. This makes the deformation of the support foil not entirely dependent on the strength and stiffness of the foil material itself or the size of the impact and gravity field, thereby making the deformation of the gas foil bearing foil controllable and adjustable, ensuring that even when it works in a huge impact and a strong gravity field, the foil only undergoes elastic deformation, and the bearing size remains normal when the strong impact disappears or the gravity field returns to normal, rather than the metal foil undergoing permanent plastic deformation that may cause abnormal operation of the gas foil bearing, thereby improving the operating accuracy of the dynamic pressure gas foil bearing, the stability and reliability of its operation, and the breadth of operating conditions.

[0035] In some embodiments, both side edges of the top foil are respectively located above the rigid support bosses on both sides, and the positioning is reliable and stable, with high feasibility.

[0036] Combination Figure 1 to Figure 4 As shown, taking the dynamic pressure gas foil bearing as a dynamic pressure gas foil radial bearing as an example, in some embodiments, the dynamic pressure gas foil radial bearing includes a radial bearing seat 1, a radial support wave foil 2 and a radial top foil 3. The radial support wave foil 2 is installed in the radial bearing seat 1 and is located between the radial bearing seat 1 and the radial top foil 3. The radial bearing seat 1 is formed with radial rigid support bosses 4 on both sides of the radial support wave foil 2, which are configured to limit the radial top foil 3 in the radial direction of compressing the radial support wave foil 2.

[0037] In some embodiments, Figure 1 to Figure 4As shown, the dynamic pressure gas foil radial bearing has 9 fixed wire grooves evenly distributed around the circumference at the position where the radial top foil 3 is installed. Every three wire grooves form a group. The middle wire grooves of each group are used to fix the radial support wave foil 2. The wire grooves with round holes on both sides of each group are used to fix the radial top foil 3. The round holes are pin holes for fixing the top foil. The radial support wave foil 2 is composed of three sections of arc-shaped foils with corrugations on the surface. In some embodiments, the corrugation height of the radial support wave foil 2 is 0.3mm~0.6mm, the corrugation diameter of the radial support wave foil 2 is 4mm~5mm, and the relative center angle of the same corresponding position point on the two adjacent corrugated shapes in the radial support wave foil 2 is 3.5°~5.5°. The three sections of radial support wave foil 2 are all installed tangent to the inner surface of the radial bearing seat 1, and the installation direction is the same. They are all inserted and fixed through the non-pin hole wire grooves. The radial top foil 3 is a one-piece integral type, and the installation direction of the radial top foil 3 is opposite to the installation direction of the three-section radial support corrugated foil 2. The circular hole wire groove for fixing the radial top foil 3 is inserted with a foil fixing pin. Figure 2 As shown, this fixing method generates self-preload through the bending back tension of the radial top foil 3, so that a preload effect is generated between the radial top foil 3 and the radial support corrugated foil 2. The dynamic pressure gas radial bearing of this structure has excellent stiffness and damping during high-speed operation, which can effectively prevent the self-excited vibration of the rotor during high-speed operation and improve the high-speed stability of the bearing.

[0038] like Figure 4 As shown, in this dynamic pressure gas foil radial bearing, it should be particularly emphasized that the support wave foil is axially located in the middle of the radial bearing seat 1. In some embodiments, the distances between the two side edges of the support wave foil and the two side edges of the bearing seat along the axial direction are both 2.5mm~4.5mm; the radial top foil 3 is also axially located in the middle of the radial bearing seat 1. In some embodiments, the distances between the two side edges of the radial top foil 3 and the two side edges of the radial bearing seat 1 along the axial direction are both 0.3mm~0.6mm; in some embodiments, the protruding height of the radial rigid support boss 4 is 0.05mm~0.15mm lower than the supporting height of the radial support wave foil 2, which may vary slightly depending on the type of material, as shown in FIG. Figure 4 As shown, the height difference needs to be reasonably controlled. If the height difference between the two is too small, the radial bearing stiffness will be too large and there will be no effective damping mechanism, which may cause self-excited vibration of the gas foil at high speed; when the height difference between the two is too large and exceeds the elastic limit of the radial support foil 2, the radial support foil 2 will still undergo plastic deformation, which will cause the radial rigid support bosses 4 arranged on both sides of the radial bearing seat 1 to not function normally, thereby affecting the bearing operation accuracy and reliability.

[0039] Combination Figures 5 to 8As shown, taking the dynamic pressure gas foil bearing as a dynamic pressure gas foil axial bearing as an example, in other embodiments, the dynamic pressure gas foil axial bearing includes an axial bearing seat 11, an axial support wave foil 12 and an axial top foil 13. The axial support wave foil 12 is installed between the axial bearing seat 11 and the axial top foil 13. The axial bearing seat 11 is formed with axial rigid support bosses 14 on both sides of the axial support wave foil 12, which are configured to limit the axial top foil 13 in the axial direction of pressing the axial support wave foil 12.

[0040] like Figure 6 As shown, in some embodiments, the axial support wave foil 12 is composed of eight fan-shaped support wave foils, the wave foil surface is corrugated, the wave height of the axial support wave foil 12 is 0.3mm-0.6mm, the wave diameter of the axial support wave foil 12 is 4mm-5mm, and the relative central angle of the same corresponding position points of two adjacent corrugated shapes in the axial support wave foil 12 is 3.5°-5.5°. The eight fan-shaped wave foils are all close to the side of the axial bearing seat 11 to form the axial rigid support boss 14, and the wave foil has a straight section tangent to the surface, and each piece has the same installation direction, and is welded to the surface of the axial bearing seat 11 by spot welding. The axial top foil 13 is also composed of eight fan-shaped foils. The axial top foil 13 is arranged on the axial rigid support boss 14 on the surface of the axial bearing seat 11. The tail end of the axial top foil 13 needs to be aligned with the tail end of the axial support wave foil 12. The two have the same installation direction. The axial top foil 13 is also fixed to the axial rigid support boss 14 by spot welding. Figure 6 As shown; it is also necessary to emphasize that the axial bearing seat 11 has 8 axial rigid support bosses 14 evenly distributed along the circumference. In some embodiments, the protruding height of the axial rigid support boss 14 is 0.03mm to 0.1mm lower than the support height of the axial support foil 12. The specific height also varies slightly depending on the type of material. Figure 7 and Figure 8 The height difference also needs to be reasonably controlled. If the height difference is too small, the wedge degree of the axial bearing will be small, making it difficult to control the bearing capacity of the axial bearing. If the height difference is too large and exceeds the elastic limit of the support foil, the support foil will still undergo plastic deformation, which will cause the axial rigid support boss 14 provided on the axial bearing seat 11 to not function properly, thereby affecting the bearing operation accuracy and reliability.

[0041] According to some embodiments of the present disclosure, a compressor is provided, comprising the above-mentioned dynamic pressure gas foil bearing, and the compressor accordingly has the above-mentioned beneficial technical effects. In some embodiments, the compressor is a fuel cell compressor for a vehicle.

[0042] According to some embodiments of the present disclosure, an air conditioner is provided, comprising the aforementioned compressor, and the air conditioner accordingly has the aforementioned beneficial technical effects.

[0043] According to some embodiments of the present disclosure, a car is provided, comprising the aforementioned compressor or the aforementioned air conditioner. The car accordingly has the above-mentioned beneficial technical effects. In some embodiments, the car is a fuel cell car.

[0044] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0045] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A dynamic pressure gas foil bearing, characterized in that: include: Bearing seat; Top layer of foil; as well as a support foil, located between the bearing seat and the top foil; Wherein, the bearing seat is formed with rigid support bosses on both sides of the supporting wave foil, and the two side edges of the top foil are respectively located above the rigid support bosses on both sides, which are configured to limit the top foil in the direction of pressing the supporting wave foil; And wherein, the dynamic pressure gas foil bearing is a dynamic pressure gas foil radial bearing, the rigid support boss is a radial rigid support boss (4) on both sides of the supporting wave foil along the axial direction of the dynamic pressure gas foil radial bearing, and the top foil on both sides of the axial direction of the dynamic pressure gas foil radial bearing are respectively located radially inside the radial rigid support boss (4) on the corresponding side; or the dynamic pressure gas foil bearing is a dynamic pressure gas foil axial bearing, the rigid support boss is an axial rigid support boss (14) on both sides of the supporting wave foil along the circumferential direction of the dynamic pressure gas foil axial bearing, and the top foil on both sides of the circumferential direction of the dynamic pressure gas foil axial bearing are respectively located axially outside the axial rigid support boss (14) on the corresponding side.

2. The dynamic pressure gas foil bearing according to claim 1, characterized in that: The protruding height of the radial rigid supporting boss (4) is 0.05 mm to 0.15 mm lower than the supporting height of the supporting corrugated foil.

3. The dynamic pressure gas foil bearing according to claim 1, characterized in that: The dynamic pressure gas foil bearing is a dynamic pressure gas foil radial bearing, and the distances between the two side edges of the supporting wave foil and the two side edges of the bearing seat along the axial direction are both 2.5mm to 4.5mm.

4. The dynamic pressure gas foil bearing according to claim 1, characterized in that: The dynamic pressure gas foil bearing is a dynamic pressure gas foil radial bearing, and the distances between the two side edges of the top foil and the two side edges of the bearing seat along the axial direction are both 0.3mm to 0.6mm.

5. The dynamic pressure gas foil bearing according to claim 1, characterized in that: The protruding height of the axial rigid supporting boss (14) is 0.03 mm to 0.1 mm lower than the supporting height of the supporting corrugated foil.

6. The dynamic pressure gas foil bearing according to any one of claims 1 to 5, characterized in that: The corrugation height of the supporting corrugated foil is 0.3 mm to 0.6 mm, the corrugation diameter of the supporting corrugated foil is 4 mm to 5 mm, and the relative central angle between the same corresponding position points of two adjacent corrugated shapes in the supporting corrugated foil is 3.5° to 5.5°.

7. A compressor, characterized in that: It comprises the dynamic pressure gas foil bearing described in any one of claims 1 to 6. An air conditioner comprising the compressor according to claim 7.

9. A car, characterized in that: Comprising the compressor according to claim 7 or the air conditioner according to claim 8.

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