CN217682816U - Axial bearing, compressor and heating and ventilation equipment - Google Patents

Abstract

The utility model discloses an axial bearing, compressor and warm equipment of leading to, the bearing includes along axial stack gradually mount pad, ripples paper tinsel and top paper tinsel, the ripples paper tinsel has the ripple section, along radial at least one end being equipped with spacing boss on the mount pad, spacing boss protrusion the mount pad towards the surface of top paper tinsel one side, just spacing boss is less than the top of ripple section. According to the embodiment of the utility model provides an 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 axial bearing.

Description

Axial bearing, compressor and heating and ventilation equipment

Technical Field

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

Background

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.

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; as shown in the schematic diagram of the original axial foil aerodynamic bearing structure of fig. 1, the axial foil bearing is composed of four parts, namely a 1-front axial mounting seat, a 2-front axial bearing axial bump foil, a 3-front axial bearing bump foil and a 4-thrust disk, and seven parts, namely a 5-rear axial bearing top foil, a 6-rear axial bearing bump foil and a 7-rear axial mounting seat; the principle is as shown in fig. 2, when the thrust plate rotates at high speed, gas is brought into the wedge-shaped area to form a high-pressure gas film, and the thrust plate is axially suspended; however, the air bearing has low bearing capacity due to small gas viscosity coefficient and large leakage, and the dynamic pressure air suspension bearing has low rigidity and damping, the height between the sheets is difficult to ensure, and the yield is low when the bearing is produced in mass.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the utility model is to provide an axial bearing, can be when the rotor unstability, protection ripples paper tinsel and top paper tinsel avoid 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 axial bearing.

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

According to the embodiment of the utility model provides an axial bearing, the bearing includes along axial direction stack gradually's mount pad, ripples paper tinsel and top paper tinsel, the ripples paper tinsel has the ripple section, be equipped with spacing boss along radial at least one end on the mount pad, spacing boss protrusion the mount pad towards the surface of top paper tinsel one side, just spacing boss is less than the top of ripple section.

According to the embodiment of the utility model provides an axial 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 axial bearing.

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

optionally, an end of the top foil extends out of the bump foil and is opposite to the limit boss in the axial 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 end face 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 surface of the limiting boss protruding out of the mounting seat to the height of the bump foil is greater than 0 and less than or equal to 20%.

Optionally, the inner periphery andor the inner periphery of the surface of the mounting seat is provided with a positioning notch, and the limiting boss is embedded into the positioning notch and protrudes out of the 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.

Optionally, the mounting seat is in the shape of a hollow annular plate.

According to the embodiment of the present invention, the compressor includes any one of the above axial bearings.

According to the embodiment of the utility model, the heating and ventilation device comprises the axial bearing; or comprises a compressor according to the foregoing.

Drawings

Fig. 1 is a schematic view of an axial bearing in some embodiments of the invention.

Fig. 2 is a top view of an axial bearing in some embodiments of the invention.

Fig. 3 is a cross-sectional view of the embodiment of fig. 2.

Fig. 4 is an enlarged view of a portion of the embodiment of fig. 3.

Reference numerals:

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

Detailed Description

The traditional axial bearing is not provided with a protection device, the rotor is subjected to axial impact instability under some unexpected environments such as sudden power failure under a high-pressure ratio, external impact causes rotor instability, surge under the high-pressure ratio and the like, the thrust disc collides against the axial bearing, the bump foil of the axial bearing is possibly crushed, the elastic damping effect is lost, the axial clearance is abnormal, the machine cannot continue to operate, and meanwhile, the rotor axial instability at a high speed causes bearing top foil abrasion failure.

The utility model provides an axial bearing 100 and compressor that has this axial bearing 100 can be when the rotor unstability, protection ripples paper tinsel 20 and top paper tinsel 30, avoid the rotor 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 axial 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 4, according to the axial bearing 100 of the embodiment of the present invention, the bearing includes a mounting seat 10, a bump foil 20 and a top foil 30 which are stacked in sequence along an axial direction, the bump foil 20 has a bump section, at least one end of the mounting seat 10 in a radial direction is provided with a limiting boss 40, the limiting boss 40 protrudes from a surface of the mounting seat 10 facing one side of the top foil 30, and the limiting boss 40 is lower than a top of the bump section.

The thrust disc 50 is provided in the axial bearing 100, the thrust disc 50 may be connected to the rotor, when the rotor is in a state of rotating at a high speed, a wedge-shaped air film may be formed between the thrust disc 50 and the top foil 30, and the wedge-shaped air film may apply a force to the top foil 30 and the bump foil 20, so that the bump foil 20 is compressed downward and generates elastic deformation, that is, the bump foil 20 may move on the inner circumferential surface of the mounting base 10 along the circumferential direction of the mounting base 10, so that damping may be provided for the high-speed rotation of the thrust disc 50, so as to ensure the stability of the rotation of the thrust disc 50, and may implement an elastic supporting effect of the bump foil 20 on the top foil 30.

Specifically, when the rotor is unstable, the thrust disk 50 connected to the rotor presses against the top foil 30 and the bump foil 20, before the thrust disk 50 collides with the top foil 30, the wedge-shaped gas film compresses the top foil 30 and the bump foil 20 to compress the top foil 30 and the bump foil 20 to be flush with or below the fiber boss, at this time, the axial bearing 100 approaches the load limit of itself, and at the same time, the limit boss 40 can stop the thrust disk 50 to prevent the thrust disk 50 from continuing to compress the top foil 30 and the bump foil 20, so as to avoid the thrust disk 50 from compressing the bump foil 20 too much, which leads to plastic deformation of the bump foil 20, and the high-speed rotation of the thrust disk 50 wears the top foil 30, thereby achieving the purpose of protecting the axial bearing 100.

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

The base material of the top foil 30 may be a nickel-based alloy, or beryllium bronze.

Of course, the structure of the bump foil 20 in the axial 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 bump foil 20 structure is described as an example below.

Similarly, the top foil 30 structure in the axial 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 present invention, the end of the top foil 30 extends out of the wave foil 20 and can be axially opposite to the limit boss 40, so that the protection effect on the wave foil 20 can be realized, the excessive compression of the rotor on the wave foil 20 is avoided, and the wave foil 20 is plastically deformed, resulting in the damage of the axial bearing 100.

Wherein, the end of the top foil 30 extends out of the bump foil 20 and can be opposite to the limit projection 40 along the axial direction of the axial 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 projection 40 can stop the end of the top foil 30, thereby limiting the top foil 30 from moving further towards the inner circumferential surface of the mounting seat 10.

Specifically, when the rotor is in a state of rotating at a high speed, a wedge-shaped air film may be formed between the rotor and the axial bearing 100, when the rotor is unstable, the thrust disc 50 may press toward the axial bearing 100, before the rotor collides with the axial bearing 100, the wedge-shaped air film between the axial bearing 100 and the thrust disc 50 may compress the top foil 30 and the bump foil 20, and may elastically deform the bump foil 20, when the end of the top foil 30 reaches the stop position, the limit boss 40 may stop the top foil 30, and may simultaneously stop the thrust disc 50, so as to prevent the thrust disc 50 from continuously pressing down, avoid causing excessive compression of the wedge-shaped air film on the bump foil 20, and plastic deformation of the bump foil 20, and perform a protection effect on the axial bearing 100.

The utility model discloses an in some embodiments, the position relative with spacing boss 40 on the top foil 30 is provided with self-lubricating coating, can reduce the friction between thrust dish 50 and axial bearing 100, reaches the effect of protection axial bearing 100.

Specifically, when the rotor is in a high-speed rotation state, when the rotor 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 axial direction of the axial bearing 100, the wedge-shaped air film between the thrust disk 50 and the axial 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 at or below the height level of the limit boss 40, the axial bearing 100 approaches the load limit of itself, at this time, due to the supporting effect of the limit boss 40 on the end of the top foil 30, the thrust disk 50 can collide with the end of the top foil 30 and be stopped by the limit boss 40 against the thrust disk 50, so as to prevent the bump foil 20 from being compressed continuously and ensure that the bump foil 20 is not plastically deformed, in addition, a self-lubricating coating can be provided on the position of the top foil 30 opposite to the limit boss 40, that is, a self-lubricating coating can be provided on the end of the top foil 30, so that the friction between the end of the thrust disk 50 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 axial bearing 100.

The utility model discloses an in some embodiments, be equipped with self-lubricating coating on the terminal surface of spacing boss 40, can reduce the friction between axial bearing 100 and the thrust dish 50, reduce the wearing and tearing of thrust dish 50 and axial bearing 100 to reach the purpose of protection axial bearing 100.

When the rotor is in a high-speed rotation state, when the rotor is unstable, the thrust disk 50 connected with the rotor gradually presses the top foil 30 and the wave foil 20, and due to the high-speed rotation of the thrust disk 50, a wedge-shaped air film is arranged between the thrust disk 50 and the axial bearing 100, before the thrust disk 50 and the top foil 30 are contacted, 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 the moment, the bearing limit of the axial bearing 100 is just approached, the thrust disk 50 collides against the limit boss 40, and the limit boss 40 stops the thrust disk 50, so that the thrust disk 50 is prevented from continuously compressing the top foil 30 and the wave foil 20, and the axial bearing 100 is prevented from being damaged, in addition, a self-lubricating coating can be arranged on the inner side face of the limit boss 40, and therefore, the friction force generated when the rotor rotates at a high speed on the limit boss 40 can be reduced, and the protection effect on the axial bearing 100 is realized.

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 thrust dish 50 and axial bearing 100, reach the effect of protection axial bearing 100.

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

In some embodiments of the present invention, the limiting boss 40 may be a graphite block, which can protect the top foil 30 and the bump foil 20 in the axial bearing 100, and in addition, can also reduce the friction between the thrust plate 50 and the axial bearing 100, and can protect the axial bearing 100 to a certain extent.

Specifically, when the thrust disk 50 rotating at a high speed collides with the limit boss 40, the limit boss 40 can stop the thrust disk 50, so as to prevent the thrust disk 50 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 axial bearing 100.

In addition, because the graphite block is made of a softer material than the thrust plate 50, the powder ground off the limiting boss 40 by the thrust plate 50 rotating at a high speed can play a role in lubricating between the thrust plate 50 and the axial bearing 100, so that the friction force between the thrust plate 50 and the axial bearing 100 can be reduced, the abrasion of the axial bearing 100 can be reduced, and the axial bearing 100 can be protected.

The utility model discloses an in some embodiments, the ratio of the height on the surface of spacing boss 40 protrusion mount pad 10 and the height of ripples paper tinsel 20 is greater than 0 and is less than or equal to 20%, can guarantee that axial bearing 100 when reaching the biggest bearing capacity, spacing boss 40 can be thrust plate 50 and play the effect of ending to the realization is to axial bearing 100's guard action.

Wherein, when the axial bearing 100 is in a just-produced state, or when the rotor is disposed on the axial bearing 100 but is not rotating, the ratio of the height of the surface of the limit boss 40 protruding out 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, under the state that the rotor is in high-speed rotation, a wedge-shaped air film can be generated between the top foil 30 and the thrust disc 50, and when the rotor is unstable, the thrust disc 50 can press the top foil 30 and the bump foil 20, at the moment, the wedge-shaped air film can compress the bump foil 20 to generate elastic deformation, and when the bump foil 20 is to generate plastic deformation, the limiting boss 40 can realize the stopping effect on the thrust disc 50, so that the thrust disc 50 cannot be pressed down continuously, the bump foil 20 can be protected, and the bump foil 20 is prevented from generating plastic deformation, so that the axial bearing 100 is damaged.

In addition, the ratio of the height of the surface of the limiting boss 40 protruding out of the mounting seat 10 to the height of the bump foil 20 can have a tolerance range of ± 0.01 mm.

The utility model discloses an in some embodiments, the internal periphery on the surface of mount pad 10 andor the internal periphery is equipped with the location breach, and spacing boss 40 imbeds the surface of location breach and protrusion mount pad 10, can carry out the circumference location to spacing boss 40, guarantees that spacing boss 40 can realize the guard action to axial bearing 100.

In addition, the limiting boss 40 may be multiple, that is, the inner peripheral element of the surface of the mounting seat 10 may be provided with multiple corresponding positioning notches, 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 with mount pad 10 interference fit to can make mount pad 10 fix a position spacing boss 40, avoid thrust plate 50 to take spacing boss 40 away and drop at high-speed pivoted in-process and be convenient for spacing boss 40 can realize the protection effect to axial bearing 100 better.

In addition, a step may be provided at an end of the mounting seat 10 close to the thrust disk 50, the step may facilitate the installation of the limit boss 40 on the mounting seat 10, and the step may also perform an axial limit function on the limit boss 40.

The utility model discloses an in some embodiments, spacing boss 40 and mount pad 10 integrated into one piece, and combine aforementioned embodiment, can be provided with self-lubricating coating on the medial surface of spacing boss 40, make spacing boss 40 can carry out the child brother to high-speed pivoted thrust disc 50, avoid thrust disc 50 to pound bad ripples paper tinsel 20 and top paper tinsel 30, and can also reduce the frictional force between thrust disc 50 and the spacing boss 40, avoid axial bearing 100 to produce wearing and tearing.

As shown in fig. 1 to 4, 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, which can protect the axial bearing 100 and can also improve the stopping effect on the thrust plate 50.

In some embodiments of the present invention, the mounting seat 10 is in the shape of a hollow annular plate, which can reduce the weight of the axial bearing 100 and can also reduce the manufacturing cost of the axial bearing 100.

According to the embodiment of the present invention, the compressor includes the axial bearing 100 of any one of the above embodiments, wherein the axial bearing 100 in the compressor can protect the bump foil 20 and the top foil 30 in the axial bearing 100 when the rotor is unstable, for example, the limit boss 40 in the axial bearing 100 can stop the thrust disk 50, so as to avoid the excessive compression of the bump foil 20 by the thrust disk 50, which leads to the plastic deformation of the bump foil 20 and thus to the damage of the axial 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 the friction between the thrust disk 50 and the top foil 30 and the limiting boss 40, and avoid the wear of the top foil 30 caused by the thrust disk 50 rotating at a high speed, resulting in the damage to the axial 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 thrust disk 50 rotating at a high speed rotates on the limiting boss 40, the powder ground down by the thrust disk 50 from the limiting boss 40 may have a lubricating effect, reduce the wear of the thrust disk 50 to the axial bearing 100, and achieve the purpose of protecting the axial 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 axial 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 fixedly connected to the mounting seat 10, and the top foil 30 can extend toward the opposite direction along the circumference of the axial bearing 100 with the wave foil 20, therefore, when the rotor rotates at a high speed, a wedge-shaped air film is formed between the top foil 30 and the thrust disk 50, 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, thereby ensuring the stability of the rotation of the rotor.

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

One end of the top foil 30 and one end of the bump foil 20 can be inserted into the positioning groove and inserted into the positioning notch by the positioning pin, so that circumferential positioning of the top foil 30 and the bump foil 20 is realized, and the top foil 30 and the bump foil 20 cannot be separated from the axial bearing 100 when the thrust disc 50 rotates in the axial bearing 100.

According to some specific examples of the present invention, the present invention provides a radial gas dynamic pressure bearing (i.e. axial bearing 100) with a protection structure, which consists of a front axial mounting seat (i.e. mounting seat 10); the bump foil 20 of the front axial bearing 100; the top foil 30 of the front axial bearing 100; the graphite guard ring of the front axial bearing 100; a thrust disk 50; a rear axial mount (i.e., mount 10); the bump foil 20 of the rear axial bearing 100; the top foil 30 of the rear axial bearing 100; the graphite ring of the rear axial bearing 100, and the like.

According to some specific examples of the utility model, to take preceding axial mount pad in axial mount pad (mount pad 10) as an example, its structure is an annular flat board, and the inner circle design has annular step to be used for installing graphite protection ring (graphite ring mounted position is the optimal solution at the inner circle in axial mount pad (mount pad 10 promptly), and the mounted position also can at the outer lane, perhaps all installs at the inner and outer lane, and axial mount pad (mount pad 10 promptly) is close to outer lane position design and has the mounting hole for installation axial bearing 100.

According to some specific examples of the present invention, the bump foil 20 in the axial bearing 100 is a kind of elastic element of the axial bearing 100, and the present invention takes the fan-shaped bump foil 20 in a continuous wave shape as an example, and here may also be a double-layer or multi-layer bump foil 20 structure or other elastic structure, such as a bubble structure, a spring structure, a wire mesh structure, etc.

According to some embodiments of the present invention, the top foil 30 of the axial bearing 100 is a planar foil with a wedge angle and parallel to the mounting seat 10, and the surface of the top foil 30 near the thrust plate 50 side is coated with a wear-resistant self-lubricating coating of high molecular polymer.

According to some specific examples of the present invention, the protection ring is a front axial bearing 100 graphite protection ring, the material of which is preferably graphite, the graphite ring is in interference fit with the axial mounting seat (i.e. mounting seat 10), after the graphite protection ring is installed in the axial mounting seat (i.e. mounting seat 10), the axial height of the graphite protection ring is lower than the height of the axial top foil 30, the height difference value of the graphite protection ring is d, the optimal value of d is ± 0.01mm on the basis of the limit displacement value which may occur when the top foil 30 has the maximum bearing capacity at the maximum rotation speed of the axial bearing 100, the farther the value of x deviates from the limit displacement value which may occur when the maximum bearing capacity at the maximum rotation speed, the worse the protection effect is, and at the same time, 0 x < (20% height value of the wave foil 20)

According to some specific examples of the utility model, when the thrust disc 50 of air suspension axial bearing 100 runs in the compressor and meets big impact and lead to rotor axial unstability, the rotor is under high speed, before the rotor bumps to top paper tinsel 30, its air film pressure compresses top paper tinsel 30 and bump paper tinsel 20 to graphite ring height flush even below, the limit of bearing that has just been close radial gaseous dynamic pressure bearing this moment, thereby the rotor is run into on the graphite ring under high speed and is avoided pounding bad bump tinsel 20 and high-speed bad top paper tinsel 30 of grinding, the graphite ring is softer than the rotor simultaneously, the powder that grinds down at high speed has the lubrication action, can not have secondary destruction effect to axial air bearing.

In some embodiments of the present invention, an axial gas dynamic pressure bearing structure with protection function, which is designed with a graphite protection ring at the axial bearing 100 on both sides of the thrust plate 50, where the selectable implementation mode selects the graphite ring to be set in the inner circle of the axial bearing 100 for explaining as the force, the same graphite ring is set in the outer circle of the axial bearing 100, or the inner and outer circles of the axial bearing 100 are designed with the graphite ring at the same time, and the graphite ring is fixed with the axial mounting seat (i.e. the mounting seat 10) by interference fit.

Wherein, the height difference between the top foil 30 of the axial bearing 100 and the graphite ring is d, the optimal value of d is +/-0.01mm on the basis of the limit displacement value possibly appearing on the top foil 30 when the axial bearing 100 has the maximum bearing capacity at the maximum rotating speed, the farther the value of d deviates from the limit displacement value possibly appearing at the maximum rotating speed, the worse the protection effect is, meanwhile, the height value of 0 to x to 20 percent of the wave foil 20 is, and meanwhile, the coating thickness of the top foil 30 is more than or equal to 0.02mm.

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 an axial bearing and have this axial bearing's compressor and warm equipment of leading to can be when the rotor unstability, and protection ripples paper tinsel and top paper tinsel avoid 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", "rear", "left", "right", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; 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 herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 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 (14)

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

2. Axial bearing in accordance with claim 1, characterized in that the end of the top foil (30) protrudes beyond the bump foil (20) and is opposite the stop boss (40) in the axial direction.

3. Axial 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. Axial bearing in accordance with claim 1, characterized in that the end faces of the stop bosses (40) are provided with a self-lubricating coating.

5. Axial bearing according to claim 3 or 4, characterised in that the self-lubricating coating is a graphite layer or a high molecular polymer layer.

6. Axial bearing in accordance with claim 1, characterized in that the limiting elevation (40) is a graphite block.

7. Axial bearing according to any of claims 1-4, characterized in that the ratio of the height of the surface of the stop boss (40) protruding the mounting seat (10) to the height of the bump foil (20) is greater than 0 and less than or equal to 20%.

8. Axial bearing according to claim 1, characterized in that the inner circumference and/or the inner circumference of the surface of the mounting seat (10) is provided with a positioning indentation, into which the stop lug (40) engages and protrudes from the surface of the mounting seat (10).

9. Axial bearing according to claim 1 or 8, wherein the limiting 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. Axial bearing in accordance with one of claims 1-4, characterized in that the stop boss (40) is formed integrally with the mounting seat (10).

11. Axial bearing in accordance with one of claims 1-4, characterized in that the limit boss (40) is in the form of a convex ring extending in the circumferential direction of the mounting seat (10).

12. Axial bearing in accordance with one of claims 1-4, characterized in that the mounting seat (10) is in the form of a hollow annular plate.

13. A compressor, characterized by comprising an axial bearing according to any one of claims 1-12.

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

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