CN217682814U - Radial bearing, compressor and heating and ventilation equipment - Google Patents

Abstract

The utility model discloses a journal bearing, compressor and warm equipment of leading to, journal bearing includes along radially nested mount pad, ripples paper tinsel and the top paper tinsel in proper order, the ripples paper tinsel has the ripple section, the mount pad is equipped with spacing boss along axial at least one end, spacing boss protrusion the inner peripheral surface of mount pad, just spacing boss is less than the top of ripple section. According to the embodiment of the utility model provides an in the radial bearing, can be when the rotor unstability, protection ripples paper tinsel and top paper tinsel avoid the rotor to pound the ripples paper tinsel to and lead to the fact wearing and tearing to the top paper tinsel, thereby reach the protection effect to radial bearing.

Description

Radial bearing, compressor and heating and ventilation equipment

Technical Field

The utility model relates to a bearing technology field especially relates to a radial bearing, have this radial bearing's compressor and have this radial bearing or warm equipment of leading to of compressor.

Background

China is the biggest world refrigeration product production, consumption and export country, and the refrigeration energy consumption accounts for 15% of the total social energy consumption. During the peak period in summer, the increase of the refrigeration load of an air conditioner and the like not only brings heavy burden to a power grid, but also generates a large amount of greenhouse gas emission. Therefore, promoting green high-efficiency refrigeration has become an important and urgent need for promoting energy conservation and emission reduction and coping with climate change in various countries.

In the context of current "carbon neutralization, carbon peaking," low carbon refrigeration equipment must be developed. The core component of a refrigeration system is a refrigeration compressor, a lubricating medium of a sliding bearing in the traditional refrigeration compressor is lubricating oil, but the lubricating medium has high viscosity, can generate high friction power consumption at high rotating speed, and has the existence of the lubricating oil, so that the heat exchange effect of a heat exchanger can be influenced after long-term use, and the performance of the refrigeration system is reduced. The magnetic suspension bearing has the advantages of low friction loss and good stability, but the cost is higher, and the advantages are not obvious in the application of small and medium-sized compressors.

The dynamic pressure gas bearing has the advantages of high rotating speed, high efficiency and low friction loss, and is very suitable for small and medium-sized compressors. The foil gas dynamic pressure bearing is divided into a radial foil gas dynamic pressure bearing and an axial foil gas dynamic pressure bearing, the radial foil gas dynamic pressure bearing is used for supporting the rotor to be in radial suspension, and the axial foil gas dynamic pressure bearing is used for supporting the axial suspension to avoid axial movement; when the rotor rotates at a high speed, gas is brought into the wedge-shaped area and extruded to form a high-pressure gas film, so that the rotor is suspended radially; however, the air bearing has a small gas viscosity coefficient, large leakage and low bearing capacity, and the rotor may be unstable and collide with the bearing at a high speed under some extreme impacts, so that the bearing is impacted and fails.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving one of the technical problems in the related art at least to a certain extent. Therefore, an object of the present invention is to provide a radial bearing, which can protect the bump foil and the top foil when the rotor is unstable, avoid the rotor from breaking the bump foil, and cause abrasion to the top foil, thereby achieving the protection effect to the radial bearing.

Another object of the present invention is to provide a compressor, which includes the radial bearing.

The utility model discloses a still another purpose with propose warm logical equipment, warm logical equipment includes aforementioned radial bearing or compressor.

According to the utility model provides an in the embodiment of the utility model provides a radial bearing, radial bearing includes along radially nested mount pad, ripples paper tinsel and the top paper tinsel in proper order, the ripples paper tinsel has the ripple section, the mount pad is equipped with spacing boss along axial at least one end, spacing boss protrusion the inner peripheral surface of mount pad, just spacing boss is less than the top of ripple section.

According to the embodiment of the utility model provides an in the radial bearing, can be when the rotor unstability, protection ripples paper tinsel and top paper tinsel avoid the rotor to pound the ripples paper tinsel to and lead to the fact wearing and tearing to the top paper tinsel, thereby reach the protection effect to radial bearing.

In addition, according to the radial bearing in the above embodiment, the following technical features may be specifically included:

optionally, an end of the top foil extends beyond the bump foil and is opposite to the position-limiting boss in the radial direction.

Optionally, a self-lubricating coating is disposed on the top foil at a position opposite to the limiting boss.

Optionally, a self-lubricating coating is arranged on the inner side surface of the limiting boss.

Optionally, the self-lubricating coating is a graphite layer or a high molecular polymer layer.

Optionally, the limiting boss is a graphite block.

Optionally, the ratio of the height of the limiting boss protruding from the inner circumferential surface of the mounting seat to the height of the bump foil is greater than 0 and less than or equal to 20%.

Optionally, a positioning notch is formed in an end of the mounting seat, and the limiting boss is embedded into the positioning notch and protrudes out of the inner circumferential surface of the mounting seat.

Optionally, the limiting boss is annular and is in interference fit with the mounting seat; or the limiting boss is welded with the mounting seat.

Optionally, the limiting boss and the mounting seat are integrally formed.

Optionally, the limiting boss is a convex ring extending along the circumferential direction of the mounting seat.

According to the embodiment of the present invention, the compressor includes the radial bearing in the above embodiment.

The heating and ventilation equipment provided by the embodiment of the utility model comprises the air bearing; or comprises a compressor according to the foregoing.

Drawings

Fig. 1 is a schematic view of a radial bearing in some embodiments of the present invention.

Fig. 2 is an enlarged view of a portion of the embodiment of fig. 1.

Fig. 3 is a cross-sectional view of a radial bearing in some embodiments of the present invention.

Fig. 4 is a schematic structural view of a radial bearing according to some embodiments of the present invention.

Fig. 5 is an isometric view of a radial bearing in some embodiments of the invention.

Reference numerals:

the radial bearing 100, the mounting seat 10, the bump foil 20, the top foil 30, the limiting boss 40, the positioning notch 50 and the rotor 60.

Detailed Description

In the related technology, the bump foil can only be protected from being smashed when the rotor is unstable, the effect of protecting the top foil cannot be achieved, and the failure of the top foil is easy to cause the failure of the bearing.

The bearing protection structure in the related art needs to be provided with a plurality of grooves on the mounting seat, and has the disadvantages of high processing difficulty, long processing time and high processing cost.

The bump foil structure in the related art is a single wave structure, and the contact area of each wave with the mounting seat is small, so that the contact damping between the bump foil and the mounting seat is small, and the stability of the bearing supporting the rotor during operation is poor.

The utility model provides a novel radial gaseous dynamic pressure bearing structure with protect function designs two protection end links at its radial gaseous dynamic pressure bearing both ends, and this end link is the optimum graphite of choosing as the material, and the graphite ring passes through interference fit with the mount pad to be fixed on radial mount pad.

The protection effect is worse as the value of x deviates from the limit displacement value which can appear at the maximum bearing force under the maximum rotating speed, and simultaneously 0< -x < -20% of wave foil height value is less.

The utility model provides a journal bearing 100 and compressor that has this journal bearing 100 can be when rotor 60 unstability, and protection ripples paper tinsel 20 and top paper tinsel 30 avoid rotor 60 to pound bad ripples paper tinsel 20 to and lead to the fact wearing and tearing to top paper tinsel 30, thereby reach the protection effect to journal bearing 100.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

As shown in fig. 1 to 5, according to the radial bearing 100 in the embodiment of the present invention, the radial bearing 100 includes a mounting seat 10, a bump foil 20 and a top foil 30 that are nested in sequence along a radial direction, wherein the bump foil 20 and the top foil 30 are both arranged along a circumferential direction of the mounting seat 10, the bump foil 20 has a ripple section, at least one end of the mounting seat 10 along an axial direction is provided with a limiting boss 40, the limiting boss 40 protrudes out of an inner circumferential surface of the mounting seat 10, and the limiting boss 40 is lower than a top of the ripple section, so that when the rotor 60 is unstable, the rotor 60 is prevented from smashing the bump foil 20 and wearing the top foil 30, thereby achieving an objective of protecting the radial bearing 100.

Wherein, under the state that rotor 60 is in high-speed rotation, can form the wedge air film between rotor 60 and the top foil 30, and the power of this wedge air film can act on ripples foil 20, makes ripples foil 20 produce elastic deformation to a certain extent, and ripples foil 20 produces the slip on the inner peripheral surface of mount pad 10 to can provide the damping for the high-speed rotation of rotor 60, in order to guarantee the stability of rotor 60 pivoted, thereby realize the elastic support of ripples foil 20 to top foil 30.

Specifically, when the rotor 60 is unstable, the rotor 60 may press against the radial bearing 100, and before the rotor 60 collides against the top foil 30, a wedge-shaped air film between the rotor 60 and the radial bearing 100 may compress the top foil 30 and the bump foil 20, and compress the top foil 30 and the bump foil 20 to be flush with or below the height of the limit boss 40, at this time, the radial bearing 100 approaches its load-bearing limit, and the limit boss 40 may stop the rotor 60, so as to avoid over-compression of the bump foil 20, which may cause plastic deformation of the bump foil 20, and high-speed rotation of the rotor 60 may cause abrasion of the top foil 30, thereby achieving a protection effect on the radial bearing 100.

Therefore, according to the radial bearing 100 of the embodiment of the present invention, when the rotor 60 is unstable, the bump foil 20 and the top foil 30 can be protected, the rotor 60 is prevented from smashing the bump foil 20, and the top foil 30 is prevented from being worn, so as to achieve the protection effect on the radial bearing 100.

It should be added that the base material of the top foil 30 may be nickel-based alloy, or beryllium bronze, etc.

Of course, the wave foil 20 structure in the radial bearing 100 may be a single layer, or may be a double layer or a multiple layer, but this is not a limitation to the scope of the present invention, and the single layer wave foil 20 structure is described as an example below.

Similarly, the top foil 30 structure in the radial bearing 100 may be a single layer, or may be a double layer or a multi-layer, but this is not a limitation to the scope of the present invention, and the following description will take the single-layer top foil 30 structure as an example.

In some embodiments of the utility model, the tip of top paper tinsel 30 stretches out ripples paper tinsel 20 to can be relative along radial with spacing boss 40, can play the effect of protection to ripples paper tinsel 20, avoid ripples paper tinsel 20 compression excessive, cause the plastic deformation of ripples paper tinsel 20, lead to journal bearing 100 to damage.

The end of the top foil 30 extends out of the bump foil 20 and can be opposite to the limit boss 40 in the radial direction of the radial bearing 100, that is, when the top foil 30 moves towards the inner circumferential surface of the mounting seat 10 and reaches the stop position, the limit boss 40 can stop the end of the top foil 30, so that the top foil 30 cannot move along the original direction.

Specifically, when the rotor 60 is in a state of high-speed rotation, a wedge-shaped air film is formed between the rotor 60 and the radial bearing 100, when the rotor 60 is unstable, the rotor 60 can press the radial bearing 100, before the rotor 60 collides with the radial bearing 100, the wedge-shaped air film between the radial bearing 100 and the rotor 60 can compress the top foil 30 and the wave foil 20, so that the wave foil 20 is elastically deformed, when the end of the top foil 30 reaches the stop position, the limit boss 40 can stop the top foil 30, and can stop the rotor 60 at the same time, so that the rotor 60 is prevented from being pressed downwards continuously, the phenomenon that the wedge-shaped air film is excessively compressed on the wave foil 20 to cause plastic deformation of the wave foil 20 is avoided, and a protection effect on the radial bearing 100 is achieved.

In some embodiments of the present invention, the position of the top foil 30 relative to the limiting boss 40 may be provided with a self-lubricating coating, which may reduce the friction between the rotor 60 and the radial bearing 100, and achieve the effect of protecting the radial bearing 100.

Specifically, when the rotor 60 is in a high-speed rotation state and is unstable, because the end of the top foil 30 extends out of the bump foil 20 and is opposite to the limit boss 40 in the radial direction of the radial bearing 100, the wedge-shaped gas film between the rotor 60 and the radial bearing 100 can compress the top foil 30 and the bump foil 20, and when the top foil 30 and the bump foil 20 are compressed to be flush with or below the height of the limit boss 40, the radial bearing 100 approaches its load-bearing limit, at this time, due to the supporting effect of the limit boss 40 on the end of the top foil 30, the rotor 60 can collide with the end of the top foil 30 and be stopped by the limit boss 40 against the rotor 60, so as to prevent the bump foil 20 from being further compressed and ensure that the bump foil 20 is not plastically deformed, and in addition, the position of the top foil 30 opposite to the limit boss 40 can be provided with a self-lubricating coating, that is, the end of the top foil 30 can be provided with a self-lubricating coating, so that the friction between the rotor 60 and the end of the top foil 30 can be reduced, and the wear of the top foil can be reduced, thereby achieving the effect of protecting the radial bearing 100.

The utility model discloses an in some embodiments, can be provided with self-lubricating coating on the medial surface of spacing boss 40, can reduce the friction between journal bearing 100 and the rotor 60, reduce the wearing and tearing of rotor 60 and journal bearing 100 to reach the purpose of protection journal bearing 100 and rotor 60.

Wherein, when the rotor 60 is in a state of high-speed rotation and is unstable, the rotor 60 will gradually press towards the top foil 30 and the wave foil 20, and because of the high-speed rotation of the rotor 60, a wedge-shaped air film is provided between the rotor 60 and the radial bearing 100, before the rotor 60 contacts with the top foil 30, the wedge-shaped air film can compress the top foil 30 and the wave foil 20 to a position flush with or below the height of the limit boss 40, at this time, the position is just close to the bearing limit of the radial bearing 100, and the rotor 60 collides with the limit boss 40, and the limit boss 40 stops the rotor 60, so as to prevent the rotor 60 from continuously compressing the top foil 30 and the wave foil 20, and damaging the radial bearing 100, in addition, a self-lubricating coating may be provided on the inner side surface of the limit boss 40, so as to reduce the friction force generated when the rotor 60 rotates at high speed on the limit boss 40, thereby achieving the protection effect of the radial bearing 100.

The utility model discloses an in some embodiments, self-lubricating coating can be graphite layer or polymer layer, and wherein, the lubricating property and the wear resistance on graphite layer or polymer layer are good to can reduce the frictional force between rotor 60 and journal bearing 100, reach the effect of protection journal bearing 100.

For example, the polymer layer may be a polyimide coating, which may improve the wear resistance and lubrication performance of the radial bearing 100, and achieve the protection effect on the radial bearing 100.

In some embodiments of the present invention, the limiting boss 40 is a graphite block, which can protect the top foil 30 and the corrugated foil 20 in the radial bearing 100, and in addition, can also reduce the friction between the rotor 60 and the radial bearing 100, and can protect the radial bearing 100 to a certain extent.

Specifically, when the rotor 60 rotating at a high speed collides with the limit boss 40, the limit boss 40 may stop the rotor 60, so as to prevent the rotor 60 from excessively compressing the top foil 30 and the bump foil 20, which may damage the top foil 30 and the bump foil 20, and thus protect the radial bearing 100.

In addition, because the graphite block is made of a softer material than the rotor 60, the powder ground on the limiting boss 40 by the rotor 60 rotating at a high speed can play a role in lubricating between the rotor 60 and the radial bearing 100, so that the friction force between the rotor 60 and the radial bearing 100 can be reduced, the abrasion of the radial bearing 100 is reduced, and the radial bearing 100 is protected.

The utility model discloses an in some embodiments, the ratio of the height of spacing boss 40 protrusion mount pad 10 inner peripheral surface and the height of ripples paper tinsel 20 is greater than 0 and is less than or equal to 20%, can guarantee that radial bearing 100 when reaching the biggest bearing capacity, and spacing boss 40 can play the effect of ending to rotor 60 to the realization is to radial bearing 100's guard action.

When the radial bearing 100 is in a just-produced state, or when the rotor 60 is disposed in the radial bearing 100 but is not rotating, the ratio of the height of the limiting boss 40 protruding from the inner circumferential surface of the mounting seat 10 to the height of the bump foil 20 is greater than 0 and less than or equal to 20%.

Specifically, when the rotor 60 is in a high-speed rotation state, a wedge-shaped air film is generated between the top foil 30 and the rotor 60, and when the rotor 60 is unstable, the rotor 60 is pressed against the top foil 30 and the bump foil 20, at this time, the wedge-shaped air film compresses the bump foil 20 to generate elastic deformation, and when the bump foil 20 is about to generate plastic deformation, the limiting boss 40 can realize a stopping effect on the rotor 60, so that the rotor 60 cannot be pressed down continuously, and the bump foil 20 can be protected, and the bump foil 20 is prevented from generating plastic deformation, so that the radial bearing 100 is damaged.

In addition, the ratio of the height of the limit boss 40 protruding from the inner peripheral surface of the mounting seat 10 to the height of the bump foil 20 may have an error range of ± 0.01 mm.

As shown in fig. 1, 4 and 5, in some embodiments of the present invention, the end of the mounting seat 10 may be provided with a positioning notch 50, and the limiting boss 40 is embedded into the positioning notch 50 and protrudes out of the inner peripheral surface of the mounting seat 10, so as to circumferentially position the limiting boss 40, thereby ensuring that the limiting boss 40 can protect the radial bearing 100.

In addition, the limiting boss 40 may be multiple, that is, the end of the mounting seat 10 may be provided with multiple corresponding positioning notches 50, so as to achieve the effect of circumferentially positioning the multiple limiting bosses 40.

The utility model discloses an in some embodiments, spacing boss 40 is the annular and can carry out interference fit with mount pad 10 to can make mount pad 10 fix a position spacing boss 40, avoid rotor 60 to take spacing boss 40 away and drop at high-speed pivoted in-process, be convenient for spacing boss 40 can realize the protection effect to journal bearing 100 better.

In addition, at least one end of the mounting seat 10 may be provided with a step, the step may facilitate the installation of the limiting boss 40 at one end of the mounting seat 10, and the step may also perform an axial limiting function on the limiting boss 40.

In other embodiments of the present invention, the limiting boss 40 may be welded to the mounting seat 10, so as to better protect the radial bearing 100 from the limiting boss 40.

The utility model discloses an in some embodiments, spacing boss 40 can with mount pad 10 integrated into one piece, and combine aforementioned embodiment, can set up self-lubricating coating on the medial surface of spacing boss 40, make spacing boss 40 can stop to high-speed pivoted rotor 60, avoid rotor 60 to pound bad ripples paper tinsel 20 and top paper tinsel 30, and can also reduce the frictional force between rotor 60 and the spacing boss 40, avoid journal bearing 100 to produce wearing and tearing.

As shown in fig. 1 to 5, in some embodiments of the present invention, the limiting boss 40 is a convex ring extending along the circumferential direction of the mounting seat 10, and can protect the radial bearing 100 in the circumferential direction.

Specifically, when the rotor 60 is unstable, in the process that the rotor 60 presses the top foil 30 and the bump foil 20, the limiting boss 40 may stop the rotor 60, so that the top foil 30 may be prevented from being worn by the rotor 60 rotating at a high speed, and the bump foil 20 may be prevented from being excessively compressed by the rotor 60, so that the bump foil 20 is prevented from being plastically deformed, and the radial bearing 100 is protected.

Of course, the limiting bosses 40 may be provided in plural along the circumferential direction of the mounting seat 10, so as to achieve the circumferential protection effect on the radial bearing 100.

In some embodiments of the present invention, one end of the wave foil 20 may be fixedly connected to the mounting seat 10, the plurality of wave foils 20 may extend toward the same direction along the circumferential direction of the mounting seat 10, and the other end may movably cooperate with the mounting seat 10 and the top foil 30, that is, the wave foil 20 may slide along the circumferential direction of the inner circumferential surface of the mounting seat 10, so as to realize the elastic supporting function of the wave foil 20 on the top foil 30.

In some embodiments of the present invention, the positioning groove is disposed on the inner peripheral surface of the mounting seat 10 (the inner peripheral surface of the mounting seat 10 is the surface of the mounting seat 10 opposite to the top foil 30), wherein the ends of at least two wave foils 20 in the plurality of wave foils 20 can be inserted into the same positioning groove, and in addition, the ends of the plurality of wave foils 20 can also be inserted into the plurality of positioning grooves respectively, so as to enhance the connection stability between the wave foils 20 and the mounting seat 10, and ensure the normal use of the radial bearing 100.

In some embodiments of the present invention, the one end of the wave foil 20 and the one end of the top foil 30 can be both fixedly connected to the mounting seat 10, and the top foil 30 can extend along the circumferential direction of the radial bearing 100 with the wave foil 20 toward the opposite direction, therefore, when the rotor 60 rotates at a high speed, a wedge-shaped air film is formed between the top foil 30 and the rotor 60, and the wedge-shaped air film can make the wave foil 20 generate elastic deformation, that is, the wave foil 20 can slide along the direction opposite to the direction in which the top foil 30 extends, so as to provide damping for the high-speed rotation of the rotor 60, thereby ensuring the stability of the rotation of the rotor 60.

The utility model discloses an in some embodiments, be provided with the constant head tank that is used for ripples paper tinsel 20 and top paper tinsel 30 grafting location on the inner peripheral surface of mount pad 10, be provided with location breach 50 on the inside wall of constant head tank, be provided with embedding location breach 50 on the mount pad 10 with the locating pin of location ripples paper tinsel 20 or top paper tinsel 30, can be used for strengthening the joint strength between ripples paper tinsel 20, top paper tinsel 30 and the mount pad 10.

One end of the top foil 30 and one end of the wave foil 20 can be inserted into the positioning groove and embedded into the positioning notch 50 by the positioning pin, so that circumferential positioning of the top foil 30 and the wave foil 20 is realized, and the top foil 30 and the wave foil 20 are prevented from being separated from the radial bearing 100 when the rotor 60 rotates in the radial bearing 100.

As shown in fig. 2, in some embodiments of the present invention, the limiting boss 40 may be a graphite ring and is disposed at an end of the mounting seat 10, wherein an inner diameter of the limiting boss 40 may be larger than an inner diameter of the top foil 30, when the rotor 60 is unstable, the bump foil 20 in the journal bearing 100 may be elastically deformed downward by a certain distance, and then the rotor 60 may be stopped by the limiting boss 40, so as to prevent the bump foil 20 from being excessively compressed, which may cause plastic deformation of the bump foil 20 and damage to the journal bearing 100.

According to the embodiment of the present invention, the compressor includes the radial bearing 100 of any one of the above embodiments, wherein the radial bearing 100 in the compressor can protect the bump foil 20 and the top foil 30 in the radial bearing 100 when the rotor 60 is unstable, for example, the limit boss 40 in the radial bearing 100 can stop the rotor 60, so as to avoid the excessive compression of the bump foil 20 by the rotor 60, which results in the plastic deformation of the bump foil 20 and thus the damage to the radial bearing 100; for another example, a self-lubricating coating may be disposed on the top foil 30 and the limiting boss 40, so as to reduce a friction force between the rotor 60 and the top foil 30 and the limiting boss 40, and avoid the rotor 60 rotating at a high speed from causing abrasion to the top foil 30, which may result in damage to the radial bearing 100, further, the limiting boss 40 may be set as a graphite block, or a graphite layer may be disposed on the limiting boss 40, when the rotor 60 rotating at a high speed rotates on the limiting boss 40, powder ground from the limiting boss 40 by the rotor 60 may have a lubricating effect, so as to reduce abrasion of the rotor 60 to the radial bearing 100, thereby achieving a purpose of protecting the radial bearing 100.

According to some specific examples of the present invention, the present invention provides a radial gas dynamic pressure bearing with a protection structure, the structure of which is shown in fig. 1 to 5, and the structure is composed of parts such as a protection ring (i.e. a limit boss 40), a radial mounting seat (mounting seat 10), a radial bearing bump foil 20, and a radial top foil 30.

The protection ring may be an annular structure, and the optimal material is graphite, and the inner diameter of the graphite ring protection ring is D, and the graphite ring is fixed at two ends of the mounting base 10 through interference fit with the mounting base 10.

Secondly, the bearing base is a finish-machined bearing sleeve, two grooves and fixed pin holes are formed above the bearing base and used for fixing the bump foil 20 and the top foil 30, and steps for installing graphite rings are machined at two ends of the installation base 10.

In addition, the radial wave foil 20 is an annular wave structure composed of successive wave structures, and is installed in the middle of the mounting seat 10, and this embodiment only takes a single-layer wave foil 20 structure as an example, and may also be a double-layer or multi-layer wave foil 20 structure or other elastic structures, such as a bubble structure, a spring structure, a wire mesh structure, and the like.

Furthermore, the radial bearing top foil 30 may be an annular structure, the base material thereof is nickel-based alloy or beryllium bronze, and a high molecular wear-resistant lubricating coating such as polyimide coating is sprayed on the inner surface of the annular structure; in the present application, the single-layer top foil 30 is merely taken as an example, and the multi-layer top foil 30 structure may be adopted.

According to some specific examples of the present invention, the graphite ring guard ring inner diameter is D, the radial bearing top foil 30 inner diameter is D, these two dimensions satisfy D-D = x, the optimum value of x is ± 0.01mm on the basis of the ultimate displacement value that may appear in the top foil 30 at the time of maximum bearing capacity at the maximum rotation speed of the radial bearing 100, the farther the value of x deviates from the ultimate displacement value that may appear at the time of maximum bearing capacity at the maximum rotation speed, the worse its protective effect, while 0< x < (20% height value of the bump foil 20).

According to some specific examples of the utility model, gas suspension bearing rotor 60 runs in the compressor and meets when big impact leads to rotor 60 unstability, rotor 60 is under high speed, before rotor 60 runs into top paper tinsel 30, its air film pressure compresses top paper tinsel 30 and ripples paper tinsel 20 to the graphite ring height flush below even, just be close radial gas dynamic pressure bearing's the limit of bearing this moment, rotor 60 runs into the graphite ring under high speed on, rotor 60 rubs out top paper tinsel 30 when avoiding pounding bad ripples paper tinsel 20 and high speed, the graphite ring is softer than rotor 60 simultaneously, the powder that grinds down under the high speed has the lubrication action, can not have secondary destruction effect to axial gas suspension bearing.

In addition, the utility model also provides a heating and ventilation device, which comprises the axial bearing; or comprises a compressor according to the foregoing. The utility model provides a compressor and warm equipment that leads to of circumference bearing and this axial bearing can be when the rotor unstability, and protection ripples paper tinsel and top paper tinsel are avoided the rotor to pound bad ripples paper tinsel to and lead to the fact wearing and tearing to the top paper tinsel, thereby reach the protection effect to radial bearing.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, a first feature "on" or "under" a second feature may be directly contacting the second feature or the first and second features may be indirectly contacting the second feature through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (13)

1. The radial bearing is characterized by comprising a mounting seat (10), a corrugated foil (20) and a top foil (30) which are sequentially nested in the radial direction, wherein the corrugated foil (20) is provided with a corrugated section, at least one axial end of the mounting seat (10) is provided with a limiting boss (40), the limiting boss (40) protrudes out of the inner peripheral surface of the mounting seat (10), and the limiting boss (40) is lower than the top of the corrugated section.

2. Radial bearing according to claim 1, wherein the end of the top foil (30) protrudes beyond the bump foil (20) and is opposite to the stop boss (40) in the radial direction.

3. Radial bearing according to claim 2, wherein the top foil (30) is provided with a self-lubricating coating at a position opposite to the stop boss (40).

4. Radial bearing according to claim 1, wherein the inner side of the stop boss (40) is provided with a self-lubricating coating.

5. The radial bearing of claim 3 or 4, wherein said self-lubricating coating is a graphite layer or a high molecular polymer layer.

6. Radial bearing according to claim 1, wherein the stop boss (40) is a graphite block.

7. The radial bearing according to any one of claims 1 to 4, wherein the ratio of the height of the stopper boss (40) protruding from the inner peripheral surface of the mount (10) to the height of the bump foil (20) is greater than 0 and less than or equal to 20%.

8. The radial bearing of claim 1, wherein the end of the mounting seat (10) is provided with a positioning notch (50), and the limiting boss (40) is embedded in the positioning notch (50) and protrudes out of the inner circumferential surface of the mounting seat (10).

9. Radial bearing according to claim 1 or 8, wherein the stop boss (40) is annular and has an interference fit with the mounting seat (10); or the limiting boss (40) is welded with the mounting seat (10).

10. Radial bearing according to any of claims 1 to 4, wherein the stop boss (40) is integrally formed with the mounting seat (10).

11. Radial bearing according to any of claims 1-4, wherein the stop boss (40) is in the form of a convex ring extending in the circumferential direction of the mounting seat (10).

12. A compressor, characterized by comprising a radial bearing according to any one of claims 1-11.

13. Heating and ventilation device, characterized in that it comprises a radial bearing according to any one of claims 1 to 11; or comprising a compressor according to claim 12.

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