CN215257367U

CN215257367U - Dynamic pressure gas foil bearing, compressor, air conditioner and automobile

Info

Publication number: CN215257367U
Application number: CN202121636144.8U
Authority: CN
Inventors: 刘华; 张治平; 钟瑞兴; 陈玉辉; 梁湖; 杨玉明
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-07-19
Filing date: 2021-07-19
Publication date: 2021-12-21
Anticipated expiration: 2031-07-19

Abstract

The present disclosure relates to a hydrodynamic gas foil bearing, a compressor, an air conditioner and an automobile, wherein the hydrodynamic gas foil bearing includes: a bearing seat; a top foil; and a supporting bump foil positioned between the bearing seat and the top foil; the bearing seat is provided with rigid supporting bosses on two sides of the supporting wave foil, the rigid supporting bosses are configured to limit the top layer foil in the direction of pressing the supporting wave foil, and the rigid supporting bosses are made of temperature-sensitive materials with expansion caused by heat and contraction caused by cold. The included angle slope of the top foil is correspondingly adjusted by controlling the height difference of the supporting bump foil and the rigid supporting boss, the height of the rigid supporting boss is changed along with the change of temperature, and the forming of a dynamic pressure bearing air film and the take-off of a rotor are facilitated when the rotating machine is at an initial starting speed; the bearing has high bearing capacity at high rotating speed, so that the running range of the bearing is widened, and the capability of the bearing facing complex and severe high-bearing working conditions is improved.

Description

Dynamic pressure gas foil bearing, compressor, air conditioner and automobile

Technical Field

The present disclosure relates to a dynamic pressure gas foil bearing, a compressor, an air conditioner and an automobile.

Background

The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.

The air suspension bearing has a series of advantages of low power consumption, good stability, small vibration, oil-free lubrication and the like, and has extremely wide application prospect in the fields of refrigeration compressors, machine tool manufacturing and the like in the future.

The air suspension bearing can be divided into a static pressure air bearing and a dynamic pressure air bearing according to the difference of the generation mechanism of a lubricating air film, wherein an axial dynamic pressure gas foil bearing is taken as one of the dynamic pressure air bearings, and mainly plays the roles of bearing axial load and providing axial rigidity and damping. The typical axial dynamic pressure gas foil bearing mainly comprises a bearing shell, a supporting bump foil and a top foil, wherein the supporting bump foil and the top foil are generally uniformly distributed along the circumference as fan-shaped thrust pads, the supporting bump foil has a special corrugated structure and serves as a supporting function similar to a spring and is a main source of the rigidity and the damping of the thrust bearing, the corresponding top foil is correspondingly arranged on the supporting bump foil, one end of the top foil is fixed on a bearing seat, the other end of the top foil is in a free sliding mode under the bearing force, the friction between the supporting bump foil and the top foil can limit the sliding of the top foil and the bearing shell, and the damping of the bearing is generated accordingly. In addition, a certain included angle is formed between the front end of the top foil and the bearing shell, the rear end of the top foil is parallel to the bearing shell, and a wedge-shaped area is formed under the effect of the included angle, so that a dynamic pressure air film is formed.

The included angle slope of the traditional typical hydrodynamic gas foil bearing is fixed, and the corresponding formed hydrodynamic gas film wedge slope is also shaped, the wedge slope is closely related to the gas film bearing capacity, and within a certain range, the smaller the included angle slope is, the higher the gas film bearing capacity is. However, in the existing refrigeration industry, some variable frequency compressors and high-speed electric spindles used on some high-end machine tools are used, the rotating speeds of the high-speed electric spindles are adjusted within a certain speed range, the corresponding axial forces under the corresponding rotating speeds are different, generally, the higher the rotating speed is, the larger the corresponding axial force is, a slope is always used correspondingly to meet all the rotating speeds and the working condition obviously cannot meet the normal operation requirement of the high-speed electric spindles, so that the abrasion of an axial gas bearing is prevented by controlling the operating rotating speed range of most of the existing gas suspension compressors, and the normal use of the gas suspension compressors is greatly limited.

SUMMERY OF THE UTILITY MODEL

One technical problem to be solved by the present disclosure is: the dynamic pressure gas foil bearing has low running precision and low working stability and reliability, and on the basis, the dynamic pressure gas foil bearing, the compressor, the air conditioner and the automobile can widen the running range of the dynamic pressure gas foil bearing and improve the capability of the dynamic pressure gas foil bearing facing complex and severe high-bearing working conditions.

Some embodiments of the present disclosure provide a hydrodynamic gas foil bearing, including: a bearing seat; a top foil; and a supporting bump foil positioned between the bearing seat and the top foil; the bearing seat is provided with rigid supporting bosses on two sides of the supporting wave foil, the rigid supporting bosses are configured to limit the top layer foil in the direction of pressing the supporting wave foil, and the rigid supporting bosses are made of temperature-sensitive materials with expansion caused by heat and contraction caused by cold.

In some embodiments, the temperature sensitive material comprises a modified nitinol.

In some embodiments, the coefficient of thermal expansion of the temperature sensitive material is configured to be between 0.001 mm/deg.C and 0.0015 mm/deg.C.

In some embodiments, the two sides of the top foil are respectively located above the rigid support bosses on the two sides.

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

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

In some embodiments, the corrugation height of the supporting wave foil is between 0.5mm and 0.6 mm.

In some embodiments, the height of the rigid support boss is configured to be 0.25mm to 0.35 mm.

Some embodiments of the present disclosure provide a compressor including the aforementioned dynamic pressure gas foil bearing.

Some embodiments of the present disclosure provide an air conditioner including the aforementioned compressor.

Some embodiments of the present disclosure provide an automobile including the aforementioned compressor or the aforementioned air conditioner.

In the technical scheme of this disclosure, the rigidity that is made by expend with heat and contract with cold's temperature sensing material through forming in the bearing frame is located the both sides of supporting the bump foil supports the boss, and the rigidity supports the boss and carries out spacing to top foil in the direction of oppression supporting the bump foil, then control the difference in height that supports bump foil and rigidity and support the boss and correspond the adjustment top foil contained angle slope, and the height of rigidity support boss rises along with the rising of temperature.

When the rotary machine runs at an initial starting speed, the height of the rigid support boss is at the lowest, and the included angle slope of the top foil is at the largest, so that the formation of a dynamic pressure bearing air film and the take-off of a rotor are facilitated.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 and 2 are schematic perspective and elevational views, respectively, of some embodiments of a hydrodynamic gas foil bearing of the present disclosure;

FIG. 3 is an enlarged partial view of the portion circled A in FIG. 2;

FIG. 4 is a schematic cross-sectional view of alternate embodiments of a hydrodynamic gas foil bearing according to the present disclosure;

FIGS. 5 and 6 are schematic perspective and exploded views, respectively, of further embodiments of the hydrodynamic gas foil bearing of the present disclosure;

FIG. 7 is a schematic side view of alternate embodiments of a hydrodynamic gas foil bearing according to the present disclosure;

fig. 8 is a partially enlarged schematic view of a portion circled B in fig. 7.

Description of the reference numerals

1. A radial bearing seat; 2. a radial support bump foil; 3. a radial top foil; 4. a radial rigid support boss; 11. an axial bearing seat; 12. axially supporting the corrugated foil; 13. an axial top foil; 14. the boss is supported in an axial rigid manner.

Detailed Description

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 disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.

The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

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 intervening devices between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, the particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.

All terms used in the present disclosure have the same meaning as understood by one of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

There is provided in accordance with some embodiments of the present disclosure a hydrodynamic gas foil bearing, including: the bearing seat is formed on two sides of the supporting wave foil, rigid supporting bosses are formed on the two sides of the supporting wave foil and are configured to limit the top layer foil in the direction of pressing the supporting wave foil, and the rigid supporting bosses are made of temperature-sensitive materials with expansion on heating and contraction on cooling.

In the illustrative embodiment, rigid supporting bosses made of temperature-sensitive materials expanding with heat and contracting with cold are formed on two sides of a supporting wave foil of a bearing seat, the rigid supporting bosses limit the top layer foil in the direction of pressing the supporting wave foil, then the height difference between the supporting wave foil and the rigid supporting bosses is controlled to correspondingly adjust the included angle slope of the top layer foil, the height of the rigid supporting bosses is increased along with the increase of the temperature, when a rotating machine runs at an initial starting speed, the height of the rigid supporting bosses is at the lowest, the included angle slope of the top layer foil is the largest, so that the formation of a dynamic pressure bearing air film and the take-off of a rotor are facilitated, when the rotor takes off, along with the increase of the rotating speed, correspondingly due to the increase of axial force, the temperature of a thrust bearing is increased along with the increase of the rotating speed of the rotor, and the height of the rigid supporting bosses is increased along with the increase of the temperature of the bearing, and then make support bump foil and rigid support boss difference in height reduce to make the top layer foil piece of thrust bearing be in low slope contained angle within range when high rotational speed, in order to guarantee that it possesses high bearing capacity under high rotational speed, and then widen the operating range of bearing and promote its ability to face complicated harsh high bearing operating mode.

It should be noted that, the thermal expansion and contraction temperature-sensitive material herein refers to a material whose volume is sensitive to change with temperature. In some embodiments, the coefficient of thermal expansion of the temperature sensitive material is configured to be between 0.001 mm/deg.C and 0.0015 mm/deg.C. Experimental studies have found that a temperature-sensitive material having a coefficient of thermal expansion within this range has high applicability.

In some embodiments, the two side edges of the top foil are respectively located above the rigid supporting bosses at the two sides, so that the position limitation is reliable and stable, and the practicability is high.

In some embodiments, the temperature-sensitive material comprises a modified nitinol alloy, which has been demonstrated by practical demonstration to have high feasibility. In other embodiments, the temperature-sensitive material comprises a material having the same temperature-sensitive effect as the modified nitinol.

Referring to fig. 1 to 4, taking a hydrodynamic gas foil bearing as an example of a hydrodynamic gas foil radial bearing, in some embodiments, the hydrodynamic gas foil radial bearing includes a radial bearing seat 1, a radial support bump foil 2, and a radial top foil 3, the radial support bump foil 2 is installed in the radial bearing seat 1 and 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 bump foil 2, and configured to limit the radial top foil 3 in a radial direction pressing the radial support bump foil 2, and the radial rigid support bosses 4 are made of a thermal-expansion and cold-contraction temperature-sensitive material.

In some embodiments, as shown in fig. 1 to 4, 9 fixing slots are uniformly distributed on the circumference of the radial bearing for the hydrodynamic gas foil at the position where the radial top foil 3 is installed, every three slots form a group, each group of middle slots is used for fixing the radial support bump foil 2, each group of slots with round holes on two sides is used for fixing the radial top foil 3, and the round holes are pin holes for fixing the top foil. The radial supporting wave foil 2 is composed of three sections of arc-shaped foil sheets, the surface of each radial supporting wave foil 2 is provided with corrugations, in some embodiments, the height of the corrugations of the radial supporting wave foil 2 is 0.3-0.6 mm, the diameter of the corrugations of the radial supporting wave foil 2 is 4-5 mm, and the angle of the same corresponding position point on the two adjacent corrugated shapes in the radial supporting wave foil 2 relative to the central angle is 3.5-5.5 degrees. The three sections of radial supporting corrugated foils 2 are all installed in a way of being tangent to the inner surface of the radial bearing seat 1, are installed in the same direction and are all inserted and fixed through the non-pin hole slots. The radial top foil 3 is of an integral circle, the installation direction of the radial top foil 3 is opposite to that of the three sections of radial supporting corrugated foils 2, and a pin for fixing the foils is inserted into a circular hole slot for fixing the radial top foil 3. As shown in fig. 2, the radial top foil 3 is bent back to tension to generate self-pretension, so that a pretensioning effect is generated between the radial top foil 3 and the radial supporting bump foil 2. The dynamic pressure gas radial bearing with the structure has excellent rigidity and damping in the high-speed operation process, can effectively prevent the self-excited vibration generated by the rotor in the high-speed operation process, and improves the high-speed stability of the bearing.

As shown in fig. 4, in the radial bearing with the dynamic pressure gas foil, it is particularly emphasized that the supporting bump foil is located at the middle position of the radial bearing seat 1 in the axial direction, and in some embodiments, the distance between two side edges of the supporting bump foil and two side edges of the bearing seat along the axial direction is 2.5mm to 4.5 mm; the radial top foil 3 is also positioned in the middle of the radial bearing seat 1 along the axial direction, and in some embodiments, the distances from the two sides of the radial top foil 3 to the two sides of the radial bearing seat 1 along the axial direction are both 0.3 mm-0.6 mm; in some embodiments, the height of the radial rigid support boss 4 is 0.05mm to 0.15mm lower than the support height of the radial support bump foil 2, which may be slightly different according to different material types, and as shown in fig. 4, the height difference needs to be reasonably controlled, and too small a height difference may cause too large rigidity of the radial bearing, and no effective damping mechanism may cause self-excited vibration of the gas foil at high rotation speed; when the height difference between the radial supporting wave foil and the radial supporting wave foil exceeds the elastic limit of the radial supporting wave foil 2, the radial supporting wave foil 2 still generates plastic deformation, so that the radial rigid supporting bosses 4 arranged on two sides of the radial bearing seat 1 cannot normally play a role, and further the running precision and the reliability of the bearing are influenced.

Referring to fig. 5 to 8, taking the example that the hydrodynamic foil bearing is a hydrodynamic foil axial bearing, in other embodiments, the hydrodynamic foil axial bearing includes an axial bearing seat 11, an axial supporting bump foil 12 and an axial top foil 13, the axial supporting bump 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 supporting bosses 14 on both sides of the axial supporting bump foil 12, the axial rigid supporting bosses 14 are configured to limit the axial top foil 13 in an axial direction pressing the axial supporting bump foil 12, and the axial rigid supporting bosses 14 are made of a temperature-sensitive material that expands with heat and contracts with cold.

As shown in fig. 6, in some embodiments, the axial supporting wave foil 12 is composed of eight fan-shaped supporting wave foil pieces, the wave foil surface is provided with ripples, the height of the ripples of the axial supporting wave foil 12 is 0.5mm to 0.6mm, the diameter of the ripples of the axial supporting wave foil 12 is 4mm to 5mm, and the angle of the same corresponding position point on two adjacent ripples of the axial supporting wave foil 12 with respect to the central angle is 3.5 ° to 5.5 °. The height of the axially rigid support boss 14 is configured to be 0.25mm to 0.35 mm. Eight fan-shaped wave foils are close to one side of the axial bearing seat 11 forming the axial rigid support boss 14, one surface of the flat section of the wave foil strip is tangent to the surface, the installation directions of the eight fan-shaped wave foils are the same, and the eight fan-shaped wave foils and the axial bearing seat 11 are welded through spot welding. The axial top foil 13 is also composed of eight fan-shaped foils, the axial top foil 13 is arranged on an 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 bump foil 12, the mounting directions of the axial top foil and the axial rigid support boss are the same, and the axial top foil 13 is fixed on the axial rigid support boss 14 through spot welding, as shown in fig. 6 specifically; it is also emphasized that the axial bearing seats 11 are circumferentially equispaced 8 axially rigidly supporting bosses 14.

In some embodiments, the height of the axially rigid supporting boss 14 at the highest rotation speed is lower than the supporting height of the axially supporting bump foil 12 by 0.05mm to 0.15mm, and the current highest rotation speed is about 100000rpm, and particularly, the height varies slightly according to different material types, and too small results in the reduction of the bearing rigidity, and further affects the stability thereof, and too large results in the reduction of the bearing load, and cannot achieve the purpose of load optimization, as shown in fig. 7 and 8. The height difference also needs to be reasonably controlled, and the axial bearing has smaller wedge-shaped degree due to the over-small height difference, so that the bearing capacity of the axial bearing is difficult to control; when the height difference between the axial bearing seat and the bearing exceeds the elastic limit of the supporting wave foil, the supporting wave foil still generates plastic deformation, so that the axial rigid supporting boss 14 arranged on the axial bearing seat 11 cannot normally function, and further the running precision and reliability of the bearing are influenced.

According to some embodiments of the present disclosure, a compressor is provided, which includes the above-mentioned dynamic pressure gas foil bearing, and accordingly has the above-mentioned advantageous technical effects. In some embodiments, the compressor is a vehicle fuel cell compressor.

According to some embodiments of the present disclosure, an air conditioner is provided, which includes the aforementioned compressor. The air conditioner has the beneficial technical effects correspondingly.

According to some embodiments of the present disclosure, an automobile is provided, which includes the aforementioned compressor or the aforementioned air conditioner. The automobile has the beneficial technical effects correspondingly. In some embodiments, the vehicle is a fuel cell vehicle.

Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof 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 gas dynamic foil bearing, comprising:

a bearing seat;

a top foil; and

a supporting bump foil located between the bearing seat and the top foil;

the bearing seat is provided with rigid support bosses on two sides of the support wave foil, the rigid support bosses are configured to limit the top foil in the direction of pressing the support wave foil, and the rigid support bosses are made of temperature-sensitive materials with expansion caused by heat and contraction caused by cold.

2. The kinetic gas foil bearing of claim 1 wherein the temperature sensitive material comprises a modified nickel titanium memory alloy.

3. The kinetic gas foil bearing of claim 1 wherein the temperature sensitive material has a coefficient of thermal expansion configured between 0.001 mm/c and 0.0015 mm/c.

4. The dynamical pressure gas foil bearing of claim 1, wherein both side edges of the top foil are respectively located above the rigid support bosses at both sides.

5. The foil hydrodynamic bearing of claim 1 wherein said foil hydrodynamic bearing is a foil hydrodynamic radial bearing.

6. The foil hydrodynamic bearing of claim 1 wherein said foil hydrodynamic bearing is a foil hydrodynamic axial bearing.

7. The dynamical pressure gas foil bearing of claim 6, wherein the corrugation height of the supporting bump foil is 0.5mm to 0.6 mm.

8. The dynamical pressure gas foil bearing of claim 6, wherein the height of the rigid support boss is configured to be 0.25mm to 0.35 mm.

9. A compressor comprising the dynamic pressure gas foil bearing according to any one of claims 1 to 8.

10. An air conditioner comprising the compressor of claim 9.

11. An automobile characterized by comprising the compressor of claim 9 or the air conditioner of claim 10.