CN211398263U - Static pressure gas radial bearing, compressor and air conditioning equipment - Google Patents

Abstract

The present disclosure relates to a static pressure gas radial bearing, a compressor and an air conditioning apparatus, wherein the static pressure gas radial bearing includes: the bearing base (1) comprises an annular base body (11), and a first through hole (111) is formed in the center of the annular base body (11); the porous layer (4) is of an annular structure and is coaxially arranged in the first through hole (111); the first foil (2) is coaxially sleeved outside the annular seat body (11), and a cavity (Q) is formed between the first foil (2) and the outer wall of the annular seat body (11); and the second foil (3) is elastic, coaxially sleeved outside the annular base body (11) and at least partially positioned in the cavity (Q), and the second foil (3) is pressed on the annular base body (11) through the first foil (2). Such a radial bearing is capable of adaptively adjusting its load-carrying capacity.

Description

Static pressure gas radial bearing, compressor and air conditioning equipment

Technical Field

The disclosure relates to the technical field of bearings, in particular to a static pressure gas radial bearing, a compressor and air conditioning equipment.

Background

The centrifugal compressor is an air conditioner compressor which utilizes the rotation of a high-speed impeller to generate centrifugal force to compress gas, and the air conditioner compressor is commonly used at present and has the advantages of fixed frequency, variable frequency, magnetic suspension and air suspension, wherein the air suspension centrifugal compressor has the advantages of simple structure, no oil, no friction, low cost and the like, and becomes the development trend of the future centrifugal compressor.

The centrifugal compressor is a device for compressing refrigerant, which mainly comprises a pneumatic system, a transmission system and the like, wherein a rotor is supported by a gas radial bearing so as to balance the radial force applied to the rotor. When the rotor is at different rotation speeds, the radial force applied to the rotor is changed. In addition, for the rotating machinery, the running state of the moving part is changeable, and the load borne by the moving part is also changed, so that the load borne by the bearing is also complicated and changeable.

At present, the compressor is found in the use process, and when the compressor is in different working conditions, the bearing capacity of the gas radial bearing is difficult to adapt to the requirement of a rotor under the condition of changing load.

Disclosure of Invention

The disclosure provides a static pressure gas radial bearing, a compressor and air conditioning equipment, which can enable the radial bearing to self-adaptively adjust the bearing capacity of the radial bearing.

An aspect of an embodiment of the present disclosure provides a static pressure gas radial bearing, including:

the bearing base comprises an annular base body, and a first through hole is formed in the center of the annular base body;

the porous layer is of an annular structure and is coaxially arranged in the first through hole;

the first foil is coaxially sleeved outside the annular base body, and a cavity is formed between the first foil and the outer wall of the annular base body; and

the second foil piece is elastic, coaxially sleeved outside the annular base body and at least partially positioned in the cavity, and is pressed on the annular base body through the first foil piece.

In some embodiments, the portion of the second foil within the cavity comprises: the bending parts extend along the axial direction, the bending parts are integrally protruded towards one side of the connecting part along the radial direction, and the protruding directions of the bending parts are consistent.

In some embodiments, two positioning grooves are circumferentially arranged on the outer side wall of the annular seat body at intervals;

the first foil comprises a first main body part and two first bending parts, the first main body part is of an annular structure with an open circumferential direction, and the two first bending parts are respectively connected to two ends of the first main body part along the circumferential direction;

the second foil comprises a second main body part and two second bending parts, the second main body part is of an annular structure with an open circumferential direction, and the two second bending parts are respectively connected to two ends of the first main body part along the circumferential direction;

wherein, the first bending part and the second bending part which are positioned at the same side are inserted into the corresponding positioning grooves for fixation.

In some embodiments, the annular seat body is provided with a pin hole along the axial direction, the pin hole penetrates through the positioning groove, and the pin penetrates through the pin hole to fix the first bending portion and the second bending portion.

In some embodiments, the bearing base further includes a rib connected to the outer wall of the annular base body between the two positioning grooves and extending in the axial direction;

the outer end surface of the convex edge along the radial direction is provided with a first air guide hole which is communicated with the first through hole so as to guide the gas into the porous layer.

In some embodiments, the rib extends along the whole axial direction of the annular seat body, and the first bleed air hole is arranged in the middle area of the rib along the axial direction.

In some embodiments, the two positioning slots extend in parallel to the direction close to the first through hole relative to the central plane of the annular seat body and are symmetrical relative to the central plane of the annular seat body, and the first bleed air hole is arranged in the middle area of the rib along the circumferential direction.

In some embodiments, a first air guiding hole is formed in the side wall of the bearing base, a vent groove is formed in the outer wall of the porous layer, the first air guiding hole is communicated with the vent groove, and the region, except the vent groove, of the outer wall of the porous layer abuts against the inner wall of the first through hole.

In some embodiments, the vent slot comprises: each first groove section is arranged at intervals along the circumferential direction and extends along the axial direction, each second groove section is arranged at intervals along the axial direction and extends along the circumferential direction, and the first groove sections and the second groove sections are communicated with each other.

In some embodiments, the first through hole includes a first hole section and two second hole sections along the axial direction, the two second hole sections are respectively located at two ends of the first hole section, the inner diameter of the second hole section is smaller than that of the first hole section, the porous layer is located in the first hole section, and two ends of the porous layer along the axial direction abut against a joint of the first hole section and the second hole section.

In some embodiments, a chamfer is arranged at a joint of the first hole section and the second hole section, and the porous layer and the annular seat body are connected through filling glue.

Another aspect of an embodiment of the present disclosure provides a compressor including:

a rotor; and

the hydrostatic gas radial bearing of the above embodiment;

the rotor penetrates through the second through hole in the center of the porous layer, and a second gap for forming an air film is formed between the porous layer and the rotor.

In some embodiments, the bearing pedestal further comprises a rib connected to the outer wall of the annular seat body, a first air guiding hole is formed in the outer end face of the rib along the radial direction, a mounting hole is formed in the bearing seat, the static pressure gas radial bearing is arranged in the mounting hole, a groove matched with the rib is formed in the inner wall of the mounting hole, a second air guiding hole is formed in the bearing seat, and the second air guiding hole is communicated with the first air guiding hole.

In some embodiments, the rotor is provided with at least two static pressure gas radial bearings along the axial direction, each static pressure gas radial bearing is supported by one bearing support, and the second air guide holes in the bearing supports are communicated with each other.

In another aspect, an embodiment of the present disclosure provides an air conditioning apparatus including the compressor of the above embodiment.

According to the static pressure gas radial bearing disclosed by the embodiment of the disclosure, the elastic second foil is added outside the bearing base, and the second foil has certain deformation capacity, so that when the radial load applied to the bearing is changed, the second foil can correspondingly adjust the self deformation, and the bearing capacity is adaptively adjusted. And due to the elastic action of the second foil, the damping device can provide additional damping for the radial bearing, so that the vibration generated when the rotating system works is reduced, and the running stability of the whole rotor system is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:

FIG. 1 is a cross-sectional schematic view of some embodiments of the hydrostatic gas radial bearing of the present disclosure;

FIG. 2 is a longitudinal cross-sectional schematic view of some embodiments of the hydrostatic gas radial bearing of the present disclosure;

FIG. 3 is an enlarged view taken at A in FIG. 1;

FIG. 4 is a cross-sectional schematic view of some embodiments of a bearing pad in the hydrostatic gas radial bearing of the present disclosure;

FIG. 5 is a schematic longitudinal cross-sectional view of some embodiments of a bearing pedestal in a hydrostatic gas radial bearing of the present disclosure;

FIG. 6 is a front view of some embodiments of a first foil in a hydrostatic gas radial bearing of the present disclosure;

FIG. 7 is a front view of some embodiments of a second foil in the hydrostatic gas radial bearing of the present disclosure;

FIG. 8 is an enlarged view of FIG. 7 at B;

FIG. 9 is a front view of some embodiments of the porous layer in the hydrostatic gas radial bearing of the present disclosure;

FIG. 10 is a schematic longitudinal cross-sectional view of some embodiments of a porous layer in a hydrostatic gas radial bearing of the present disclosure;

fig. 11 is a schematic structural view of some embodiments of the compressor of the present disclosure.

Description of the reference numerals

1. A bearing base; 2. a first foil; 3. a second foil; 4. a porous layer; 5. a rotor; 6. a first bearing support; 6', a second bearing support; 7. a second air vent; q, a cavity;

11. an annular base; 111. a first through hole; 111A, a first bore section; 111B, a second bore section; 111C, chamfering; 112. a pin hole; 113. positioning a groove; 12. a rib; 121. a first air vent;

21. a first main body portion; 22. a first bending portion; 221. a second mounting hole; 23. a first through hole; 24. a second groove;

31. a second main body portion; 311. a bending section; 312. a connecting portion; 32. a second bending portion;

41. a second through hole; 42. a first groove section; 43. a second groove section;

61. mounting holes; 62. a groove;

71. a gas supply section; 72. a first guide leg; 73. a second guide leg.

Detailed Description

The present disclosure is described in detail below. In the following paragraphs, different aspects of the embodiments are defined in more detail. Aspects so defined may be combined with any other aspect or aspects unless clearly indicated to the contrary. In particular, any feature considered to be preferred or advantageous may be combined with one or more other features considered to be preferred or advantageous.

The terms "first", "second", and the like in the present disclosure are merely for convenience of description to distinguish different constituent elements having the same name, and do not denote a sequential or primary-secondary relationship.

In the description of the present disclosure, it is to be understood that the terms "central," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present disclosure and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and therefore, should not be considered as limiting the scope of the present disclosure.

The air suspension compressor adopts an air bearing to support a rotor system of the air suspension compressor, and the air bearing is mainly divided into a dynamic pressure air bearing and a static pressure air bearing at present.

The gas bearing can be divided into a static pressure gas bearing and a dynamic pressure gas bearing according to different principles, wherein the dynamic pressure gas bearing is a self-acting pressure type flexible bearing, and operates by a layer of lubricating gas film formed by the dynamic pressure gas bearing, and the principle is a dynamic pressure principle. The static pressure gas bearing is a system for supporting a rotor by a pressure gas film generated in a small gap range, wherein gas enters the gap through a bearing gas supply hole and then passes through small holes (laser micropores and porous holes) on the surface of the bearing, and the pressure is increased due to the extrusion of the gas after entering the gap because the general gap (0.02mm-0.05mm) is small, thereby playing a supporting role. Because the gas friction coefficient is small, the static pressure gas bearing is a bearing basically without friction and with small loss.

The throttling technologies adopted by the conventional air hydrostatic bearing include single-pore throttling type, multi-pore throttling type, micro-groove throttling type, micropore throttling type and porous material throttling type, wherein the porous hydrostatic gas bearing utilizes a novel porous material as a bearing surface to obtain a lubricating gas film with good consistency. A large number of tiny air supply holes are distributed in the porous material, and an external air source enters the surface of the bearing through the porous material to form a pressure air film for supporting load.

The working principle of the porous gas bearing is complex, when external driving force is not provided for the rotor and only external gas source is provided, gas supplied by the bearing enters small holes (micropores and porous holes) of the static pressure gas bearing through the gas inlet holes, and finally a pressure gas film is formed at the gap between the rotor and the bearing to support external load, and under the working condition, the bearing is equivalent to a pure static pressure gas bearing; when external air pressure is not provided and only external driving force is provided for the rotor, lubricating gas is brought into the wedge-shaped gap due to the hydrodynamic effect and forms a lubricating gas film to bear external load, and at the moment, the bearing is equivalent to a pure hydrodynamic gas bearing; when an external air source and an external force for driving the rotor to rotate are provided at the same time, if the rotating speed is high, the dynamic pressure effect generated by the rotation of the rotor cannot be ignored at the moment.

The direct rigidity coefficients Kxx and Kyy of the porous hydrostatic bearing are increased along with the increase of the rotating speed, and the direct damping coefficients Cxx and Cyy are reduced along with the increase of the rotating speed, because the influence of the dynamic pressure effect on the dynamic characteristics of the bearing is far greater than the static pressure effect when the rotating speed is higher, the higher the rotating speed is, the stronger the wedge effect and the dynamic pressure effect of the air film are, the larger the bearing capacity of the bearing is, and the more difficult the formed air film thickness distribution is to be changed under the condition, so that the bearing shows larger rigidity.

In addition, under high-speed operating mode, the degree that the gas in the bearing clearance is compressed is higher to being extruded bearing rotor system, gaseous reduction makes the gas film kinematic viscosity reduce, thereby leads to the damping coefficient of bearing to reduce, and the damping reduces, leads to the bearing vibration in the operation process unable offset, therefore the operating stability of bearing can receive very big influence. In addition, for the rotary machine, the running state of the moving part is changeable, and the load borne by the moving part is also changeable, so that the load borne by the bearing is also complicated and changeable, and for the porous static pressure gas bearing, the self-adaptability is general, and the bearing capacity cannot be automatically adjusted.

Based on this, as shown in fig. 1-10, the present disclosure provides a hydrostatic gas radial bearing, in some embodiments, comprising: a bearing substrate 1, a porous layer 4, a first foil 2 and a second foil 3. The subsequent references to "circumferential", "axial" and "radial" are with respect to the radial bearing.

As shown in fig. 4 and 5, the bearing base 1 includes an annular base body 11, and a center of the annular base body 11 has a first through hole 111 along an axial direction of the bearing. The porous layer 4 is in a ring structure and is coaxially disposed in the first through hole 111, and for example, a porous graphite block is used. As shown in fig. 3, the first foil 2 is coaxially sleeved outside the annular base body 11, and a cavity Q is formed between the first foil 2 and the outer wall of the annular base body 11. The second foil 3 has elasticity, is coaxially sleeved outside the annular base body 11, is at least partially positioned in the cavity Q, and is pressed on the annular base body 11 through the first foil 2. The first foil 2 mainly serves for the connection force transmission for transmitting the force of the bearing support to the second foil 3.

Both the first foil 2 and the second foil 3 are made of a metallic material. The second foil 3 may be arranged along a complete turn or close to a complete turn of the bearing base 1.

In the embodiment, the elastic second foil 3 is added on the outer wall of the bearing base 1 of the radial bearing, because the second foil 3 has certain elastic deformation capacity, when the radial force applied to the rotor changes to generate vibration, the second foil 3 is transmitted to the second foil 3 through the air film to force the second foil 3 to generate elastic deformation to eliminate the vibration, and when the vibration is weakened, the deformation of the second foil 3 can be automatically adjusted, so that the bearing capacity can be adaptively adjusted.

Moreover, due to the elastic effect of the second foil 3, additional damping can be provided for the radial bearing, so that the vibration energy of the rotor is absorbed, the vibration of the rotor is reduced, and the operation stability of the whole rotor system is improved.

In addition, due to the elastic action of the second foil 3, when the rotor tilts in the rotating process, the elastic deformation of the second foil can change the air film gap, so that the rotor can return and run stably again under the action of the air film, and the running stability of the whole rotor system is improved.

As shown in fig. 8, the portion of the second foil 3 located in the cavity Q includes: the plurality of bending portions 311 and the plurality of connecting portions 312 are alternately arranged along the circumferential direction, the bending portions 311 extend along the entire axial direction, the bending portions 311 are integrally protruded toward one side of the connecting portion 312 along the radial direction, and the protruding directions of the bending portions 311 are consistent. For example, each bend 311 may project radially outward or inward. Thereby, each bent portion 311 and each connecting portion 312 form a wave-shaped structure in the circumferential direction.

For example, the curved portion 311 has a C-shape, a triangular shape, a square shape, or a trapezoidal shape, and the connecting portion 312 has a circular arc shape and is attached to the outer wall of the annular base 11.

The second foil 3 is designed to have a corrugated structure, so that the embodiment has good elastic deformation capability, and the bent portion 311 protrudes in the radial direction, so that the second foil 3 can be forced to deform by itself when the axial force applied to the bearing changes, so that the bearing has a certain self-adaptive capability. Furthermore, the second foil 3 can also provide an additional high damping of the bearing. Moreover, if each bent portion 311 protrudes outward in the radial direction, the connection portion 312 of the second foil 3 is completely contacted with the outer wall of the annular seat body 11, so that the installation stability of the second foil 3 can be improved; the first foil 2 and the second foil 3 are contacted through the top of the bending part 311, and the second foil 3 is easily forced to deform by the force of the first foil 2.

As shown in fig. 3 and 4, two positioning grooves 113 are circumferentially spaced on the outer side wall of the annular seat body 11. The first foil 2 includes a first main body 21 and two first bent portions 22, the first main body 21 is an annular structure with an open circumferential direction, and the two first bent portions 22 are respectively connected to two ends of the first main body 21 along the circumferential direction. The second foil 3 includes a second main body portion 31 and two second bent portions 32, the second main body portion 31 is an annular structure with an open circumferential direction, and the two second bent portions 32 are respectively connected to two ends of the first main body portion 21 along the circumferential direction. The first foil 2 and the second foil 3 may be formed by bending a metal sheet structure.

The first bending portion 22 and the second bending portion 32 located on the same side are inserted into the corresponding positioning grooves 113 and fixed, and the thickness of the positioning grooves 113 is matched with the total thickness of the first bending portion 22 and the second bending portion 32.

This embodiment can reliably fix the first foil 2 and the second foil 3 to the bearing base 1, prevent the first foil from being detached from the bearing base 1 when receiving vibration or external force, and elastically deform the second foil 3 when the bearing receives radial force transmitted from the rotor system.

In some embodiments, the static pressure gas radial bearing further includes a pin, the annular housing 11 is provided with a pin hole 112 along the axial direction, the pin hole 112 passes through the positioning slot 113, and the pin is inserted into the pin hole 112 to fix the first bending portion 22 and the second bending portion 32. This structure can more reliably fix the first bent portion 22 and the second bent portion 32, and after the pin is inserted into the pin hole 112, the first bent portion 22 and the second bent portion 32 can be bent toward the side wall where the two pin holes 112 are close to each other.

As shown in fig. 3, the bearing base 1 further includes a rib 12, and the rib 12 is connected to the outer wall of the annular base body 11 between the two positioning grooves 113 and extends in the axial direction. The outer end surface of the rib 12 in the radial direction is provided with a first gas introducing hole 121, and the first gas introducing hole 121 communicates with the first through hole 111 to introduce gas into the porous layer 4.

In the embodiment, by providing the rib 12, after the first bending portion 22 and the second bending portion 32 are inserted into the corresponding positioning grooves 113, the length section of the first bending portion 22 close to the first main body portion 21 can abut against the sidewall of the rib 12, so as to prevent the first foil 2 from being deformed by an external force at the bending position, and the reliability of the connection between the first foil 2 and the second foil 3 and the bearing base 1 can be improved.

As shown in fig. 11, the bearing is supported by a bearing support, the bearing support is provided with a mounting hole 61, the static pressure gas radial bearing is arranged in the mounting hole 61, and the inner wall of the mounting hole 61 is provided with a groove 62 matched with the convex rib 12. During assembly, the ribs 12 engage the grooves 62 to prevent the bearing from rotating in the radial direction.

As shown in fig. 5, the rib 12 extends along the entire axial direction of the annular holder body 11, and the first air guiding hole 121 is provided in the middle area of the rib 12 along the axial direction.

This embodiment enables the bearing to be smoothly installed into the mounting hole 61 from the side, and the first air introducing hole 121 is provided in the middle area of the rib 12 in the axial direction, so that the air can be introduced and simultaneously flow toward both sides in the axial direction, thereby making the air inlet distribution at both sides of the porous layer 4 more symmetrical, improving the stability of the air film formed between the porous layer 4 and the rotor 5, and preventing the rotor 5 from deflecting during operation.

As shown in fig. 3, the two positioning slots 113 extend in parallel to the central plane of the annular base 11 in a direction close to the first through hole 111, and are symmetrical to the central plane of the annular base 11, and the first air guiding hole 121 is disposed in the middle area of the protruding rib 12 along the circumferential direction. For example, the first gas introduction hole 121 has a circular hole structure to maintain the pressure of the introduced gas.

This embodiment can make the wall thickness of the rib 12 on both sides of the first air guiding hole 121 the same to guarantee the structural strength of the rib 12, prevent the high-pressure gas from being introduced for a long time to influence the strength of the weak portion, and can prevent the positioning groove 113 from being deformed, guaranteeing the fixing reliability to the first bending portion 22 and the second bending portion 32.

As shown in fig. 1 and 2, a first air guiding hole 121 is formed in a side wall of the bearing base 1, an air channel is formed in an outer wall of the porous layer 4 to serve as an air cavity, the first air guiding hole 121 is communicated with the air channel, and a region of the outer wall of the porous layer 4 except the air channel abuts against an inner wall of the first through hole 111.

After entering from the first air introducing hole 121, the outside air enters each of the pores of the porous layer 4 through the air flow channel to form an annular air film between the inner wall of the porous layer 4 and the rotor 5. The outer wall of the porous layer 4 abuts against the inner wall of the first through hole 111, so that stable supporting force can be provided for the porous layer 4, and the porous layer 4 is prevented from being broken when the stress is too large.

As shown in fig. 1 and 2, the vent groove includes: the porous layer 4 comprises a plurality of first groove sections 42 and a plurality of second groove sections 43, wherein the first groove sections 42 are arranged at intervals along the circumferential direction and extend along the axial direction, the second groove sections 43 are arranged at intervals along the axial direction and extend along the circumferential direction, the first groove sections 42 and the second groove sections 43 are crossed to form a grid shape and are communicated with each other, and ribs among the groove sections are in contact with the inner wall of the first through hole 111 to support the porous layer 4. As shown in fig. 4, four axially extending first groove segments 42 are provided at regular intervals in the circumferential direction, and as shown in fig. 5, three annular second groove segments 43 are provided at regular intervals in the axial direction.

By providing each of the first groove section 42 and the second groove section 43, the gas entering from the first gas introduction hole 121 can be introduced to each position of the porous layer 4 to form a uniform and stable gas film. Moreover, the gas is gathered in the vent grooves, so that the gas can enter the porous layer 4 more stably and sufficiently, and the gas can penetrate into the gaps more uniformly.

As shown in fig. 5, the first through hole 111 includes a first hole section 111A and two second hole sections 111B along the axial direction, the two second hole sections 111B are respectively located at two ends of the first hole section 111A, the inner diameter of the second hole section 111B is smaller than that of the first hole section 111A, the porous layer 4 is located in the first hole section 111A, and two ends of the porous layer 4 along the axial direction abut against a joint of the first hole section 111A and the second hole section 111B.

This embodiment can pack into first through-hole 111 the back to porous layer 4, carries on spacingly to porous layer 4 along axial both ends, is difficult to deviate from, improves the fastness of porous layer 4 installation.

As shown in fig. 5, a chamfer 111C is provided at the joint of the first hole section 111A and the second hole section 111B, and the porous layer 4 is connected to the annular base body 11 by filling adhesive, so that the structure is easy to fill adhesive and can reliably fix the porous layer 4.

The static pressure gas radial bearing disclosed by the embodiment of the disclosure has good damping characteristics and self-adaptive capacity, and can provide extra high damping for the bearing under the working condition of high rotating speed, so that the condition that the bearing is unstable when the damping of the bearing is reduced due to the fact that the dynamic pressure effect of the bearing is enhanced under the high rotating speed is prevented, and the defect that the porous static pressure gas bearing is low in damping under the high rotating speed state is well overcome. The bearing has certain self-adaptive capacity due to the deformation capacity of the second foil, large deformation is generated when vibration is large, deformation is recovered when vibration is small, and the bearing has flexible vibration resistance due to the change of rotor vibration, so that the rotating speed operation range of the porous static pressure bearing and the stability of the porous static pressure gas bearing are improved. Therefore, the bearing can improve the operation stability and reliability of the equipment rotor system, and solves the problem of rotor operation instability caused by the reduction of the damping of the static pressure gas bearing in a high rotating speed state.

In addition, the bearing can well fix the first foil piece 2 and the second foil piece 3 on the bearing base 1, so that the first foil piece 2 and the second foil piece 3 are prevented from being damaged in the working process, and the working reliability of the bearing is improved.

Secondly, the present disclosure provides a compressor, such as a centrifugal compressor. In some embodiments, as shown in fig. 11, the compressor includes: rotor 5 and the hydrostatic gas radial bearing of the above embodiment. The rotor 5 passes through the second through hole 41 in the center of the porous layer 4, and a second gap for forming a gas film is provided between the porous layer 4 and the rotor 5.

When the compressor of the embodiment is in different working conditions, the radial force applied to the rotor can be greatly changed, and the second foil 3 of the radial bearing has certain deformation capacity, so that the air film gap between the radial bearing and the rotor 5 can be adjusted by adjusting the deformation of the second foil, and the bearing capacity of the bearing can be adaptively adjusted, so that the radial bearing can have stable bearing capacity under each working condition of the compressor, and the adaptability is improved. Moreover, due to the elastic action of the second foil 3, additional damping can be provided for the radial bearing, so that the vibration generated when the rotation system works is reduced, and the running stability of the compressor is further improved.

In some embodiments, as shown in fig. 11, the compressor further includes a bearing support, the bearing base 1 further includes a rib 12 connected to the outer wall of the annular base 11, the outer radial end surface of the rib 12 is provided with a first air guiding hole 121, the bearing support is provided with a mounting hole 61, the static pressure air radial bearing is arranged in the mounting hole 61, the inner wall of the mounting hole 61 is provided with a groove 62 matched with the rib 12, the bearing support is provided with a second air guiding hole 7, and the second air guiding hole 7 is communicated with the first air guiding hole 121.

This embodiment not only can realize the location of the bearing and prevent the bearing from rotating in the mounting hole 61 by matching the rib 12 with the groove 62, but also can supply air to the first air guiding hole 121 through the second air guiding hole 7 inside the bearing support, thereby solving the problem of difficult air guiding caused by arranging the first foil 2 and the second foil 3 outside the bearing base 1.

In some embodiments, the rotor 5 is provided with at least two static gas radial bearings in the axial direction, each of which is supported by a bearing support, the second bleed air holes 7 in the bearing supports communicating with each other. The structure can lead the air supply pressure of each static pressure gas radial bearing to be consistent so as to lead the air film pressure generated by each radial bearing to be close, thereby providing more balanced supporting force for the rotor 5 and leading the rotor 5 to work stably.

For example, both ends of the rotor 5 are supported by one radial bearing, two radial bearings are supported by the first bearing support 6 and the second bearing support 6', respectively, and the first foil 2 is in contact with the hole wall of the mounting hole 61 of the bearing support to be transferred to the second foil 3 through the first foil 2 when the bearing support is subjected to vibration generated by a radial force, so that the second foil 3 is adapted to the change of the radial force by elastic deformation.

The second air guiding hole 7 includes an air supply section 71, a first guiding branch section 72 and a second guiding branch section 73, the air supply section 71 is used for introducing external air, two ends of the first guiding branch section 72 are respectively communicated with the air supply section 71 and the first air guiding hole 121, two ends of the second guiding branch section 73 are respectively communicated with the air supply section 71 and the second guiding branch section 73 of another bearing support, and the second guiding branch sections 73 of the two bearing supports are communicated. The first bearing support 6 and the second bearing support 6' and thus the second bleed holes 7 have different configurations, as a result of which the arrangement of the components in the compressor housing is influenced.

Thirdly, the present disclosure also provides an air conditioning apparatus including the compressor of the above embodiment.

The above has described in detail a hydrostatic gas radial bearing, a compressor and an air conditioning apparatus provided by the present disclosure. The principles and embodiments of the present disclosure are explained herein using specific examples, which are set forth only to help understand the method and its core ideas of the present disclosure. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present disclosure without departing from the principle of the present disclosure, and such improvements and modifications also fall within the scope of the claims of the present disclosure.

Claims (15)

1. A hydrostatic gas radial bearing, comprising:

the bearing base (1) comprises an annular base body (11), and a first through hole (111) is formed in the center of the annular base body (11);

the porous layer (4) is of an annular structure and is coaxially arranged in the first through hole (111);

the first foil (2) is coaxially sleeved outside the annular seat body (11), and a cavity (Q) is formed between the first foil (2) and the outer wall of the annular seat body (11); and

the second foil (3) is elastic, coaxially sleeved outside the annular base body (11) and at least partially positioned in the cavity (Q), and the second foil (3) is pressed on the annular base body (11) through the first foil (2).

2. The hydrostatic gas radial bearing of claim 1, wherein the portion of the second foil (3) located within the cavity (Q) comprises: the connecting structure comprises a plurality of bending parts (311) and a plurality of connecting parts (312), wherein the bending parts (311) and the connecting parts (312) are alternately arranged at intervals along the circumferential direction, the bending parts (311) extend along the axial direction, the bending parts (311) integrally bulge towards one side of the connecting parts (312) along the radial direction, and the bulging directions of the bending parts (311) are consistent.

3. The hydrostatic gas radial bearing of claim 1, wherein the outer side wall of the annular seat body (11) is provided with two positioning grooves (113) at intervals along the circumferential direction;

the first foil (2) comprises a first main body part (21) and two first bending parts (22), the first main body part (21) is of an annular structure with a circumferential opening, and the two first bending parts (22) are respectively connected to two ends of the first main body part (21) along the circumferential direction;

the second foil (3) comprises a second main body part (31) and two second bending parts (32), the second main body part (31) is of an annular structure with a circumferential opening, and the two second bending parts (32) are respectively connected to two ends of the first main body part (21) along the circumferential direction;

the first bending part (22) and the second bending part (32) which are positioned on the same side are inserted into the corresponding positioning grooves (113) and fixed.

4. The hydrostatic gas radial bearing of claim 3, further comprising a pin, wherein the annular seat body (11) is provided with a pin hole (112) along an axial direction, the pin hole (112) passes through the positioning groove (113), and the pin is inserted into the pin hole (112) to fix the first bending portion (22) and the second bending portion (32).

5. The static pressure gas radial bearing according to claim 3, wherein the bearing base (1) further comprises a rib (12), the rib (12) is connected to the outer wall of the annular seat body (11) between the two positioning grooves (113) and extends in the axial direction;

and a first air guide hole (121) is formed in the outer end face of the convex rib (12) along the radial direction, and the first air guide hole (121) is communicated with the first through hole (111) so as to guide the gas into the porous layer (4).

6. Static pressure gas radial bearing according to claim 5, wherein said rib (12) extends along the entire axial direction of said annular seat (11), said first air guiding hole (121) being provided in the middle area of said rib (12) in the axial direction.

7. The static pressure gas radial bearing according to claim 5, wherein two of said positioning grooves (113) extend in parallel to the direction close to said first through hole (111) with respect to the central plane of said annular seat body (11) and are symmetrical with respect to the central plane of said annular seat body (11), and said first air guide hole (121) is provided in the middle region of said rib (12) in the circumferential direction.

8. The hydrostatic gas radial bearing of claim 1, wherein the side wall of the bearing base (1) is provided with a first gas guiding hole (121), the outer wall of the porous layer (4) is provided with a vent groove, the first gas guiding hole (121) is communicated with the vent groove, and the outer wall of the porous layer (4) abuts against the inner wall of the first through hole (111) except the vent groove.

9. The hydrostatic gas radial bearing of claim 8, wherein the vent slots comprise: the groove structure comprises a plurality of first groove sections (42) and a plurality of second groove sections (43), wherein the first groove sections (42) are arranged at intervals along the circumferential direction and extend along the axial direction, the second groove sections (43) are arranged at intervals along the axial direction and extend along the circumferential direction, and the first groove sections (42) and the second groove sections (43) are communicated with each other.

10. The static pressure gas radial bearing according to claim 1, wherein the first through hole (111) comprises a first hole section (111A) and two second hole sections (111B) in an axial direction, the two second hole sections (111B) are respectively located at both ends of the first hole section (111A), an inner diameter of the second hole section (111B) is smaller than that of the first hole section (111A), the porous layer (4) is located in the first hole section (111A), and both ends of the porous layer (4) in the axial direction abut against a joint of the first hole section (111A) and the second hole section (111B).

11. The static pressure gas radial bearing according to claim 10, wherein a junction of the first bore section (111A) and the second bore section (111B) is provided with a chamfer (111C), and the porous layer (4) and the annular seat body (11) are connected by filling glue.

12. A compressor, comprising:

a rotor (5); and

the hydrostatic gas radial bearing of any of claims 1 to 11;

wherein the rotor (5) passes through a second through hole (41) in the center of the porous layer (4), and a second gap for forming a gas film is formed between the porous layer (4) and the rotor (5).

13. The compressor of claim 12, further comprising a bearing support (6; 6 '), wherein the bearing base (1) further comprises a rib (12) connected to an outer wall of the annular seat body (11), a first air guide hole (121) is formed in an outer end surface of the rib (12) in the radial direction, a mounting hole (61) is formed in the bearing support (6; 6 '), the static pressure gas radial bearing is arranged in the mounting hole (61), a groove (62) matched with the rib (12) is formed in an inner wall of the mounting hole (61), a second air guide hole (7) is formed in the bearing support (6; 6 '), and the second air guide hole (7) is communicated with the first air guide hole (121).

14. Compressor according to claim 13, characterized in that the rotor (5) is provided with at least two static gas radial bearings in axial direction, each static gas radial bearing being supported by one of the bearing supports (6; 6 '), the second gas guiding holes (7) in each of the bearing supports (6; 6') being in communication with each other.

15. An air conditioning apparatus comprising the compressor of any one of claims 12 to 14.

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