Radial air suspension bearing, rotor system and air cycle machine

Abstract

The utility model provides a radial air suspension bearing, a rotor system and an air cycle machine, the radial air suspension bearing is used for providing support for the radial direction of a rotating shaft, the radial air suspension bearing is provided with an air entraining structure, and the air entraining structure is used for entraining air to provide support for the rotating shaft. And the rotating shaft is prevented from making contact with the side wall of the radial air suspension bearing under the action of the gravity of the rotating shaft. According to the technical scheme provided by the utility model, when the rotor system is in the start-stop stage, high-pressure gas can be introduced through the gas introduction structure to support the rotating shaft, so that the rotating shaft is prevented from being in contact with the side wall of the radial gas suspension bearing under the action of self gravity, and the friction loss between the rotating shaft and the bearing in the start-stop stage of the rotor system can be avoided; and the service lives of the rotating shaft and the bearing are prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of gas suspension bearing, concretely relates to a radial gas suspension bearing, rotor system and air cycle machine. BACKGROUND

[0002] The high efficient and stable operation of air cycle machine is closely related to the working state of rotor system, since the rotor system size of air cycle machine is small, in order to reach enough processing capacity, its stable operation speed often exceeds 50000 revolutions per minute, at this time, a high efficient and stable shaft-bearing cooperation is needed to satisfy this speed requirement. Since the conventional roller bearing is prone to generate a large amount of friction heat, etc., it is easy to cause bearing damage, even to occur sticking, leading to rotor system damage, therefore, the non-contact gas suspension bearing has been widely applied.

[0003] As shown in the structure diagram of air cycle machine, Figure 1 As shown in the structure diagram of air cycle machine, Figure 2 The air cycle machine adopts three-wheel boost type structure, which mainly includes turbine 1, compressor 2 and fan 3 three parts. The bleed air source from engine enters the compressor inlet 101 after heat exchange and cooling, is discharged from the compressor outlet 102, enters turbine 1 after water removal and further cooling and expands to do work, is discharged from turbine outlet 104 and enters the cabin after temperature adjustment. In the ground state, the ambient air is sucked into the heat exchanger by fan 3 to cool the bleed air source. The rotating shaft 20 of rotor system is supported by the first radial gas suspension bearing 4 and the second radial gas suspension bearing 5. In the starting and stopping process of rotor system, the rotating speed of rotating shaft 20 is low, the rotating shaft 20 is in contact with the radial gas suspension bearing under the action of its own gravity, which causes friction between the rotating shaft 20 and the radial gas suspension bearing, and causes wear between the rotating shaft 20 and the bearing, and further destroys the stability of the rotating shaft 20. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a radial gas suspension bearing, rotor system and air cycle machine, which can solve the technical problem that in the starting and stopping process of rotor system, the rotating shaft is in contact with the radial gas suspension bearing under the action of its own gravity, which causes friction between the rotating shaft and the radial gas suspension bearing, and causes wear between the rotating shaft and the bearing.

[0005] In order to solve the above problems, the utility model provides a radial gas suspension bearing for providing radial support to the rotating shaft, the radial gas suspension bearing is provided with an air guide structure, the air guide structure is used for guiding air to provide support to the rotating shaft, so as to prevent the rotating shaft from being in contact with the side wall of the radial gas suspension bearing under the action of its own gravity.

[0006] In some embodiments, the air entraining structure comprises an air entraining hole set arranged on the radial air suspension bearing, and air entraining holes in the air entraining hole set pass through from the outer sidewall to the inner sidewall of the radial air suspension bearing; wherein the air entraining structure provides support for the rotating shaft by introducing gas through the air entraining hole set.

[0007] In some embodiments, the air entraining hole set comprises a first air entraining hole, and a center line of the first air entraining hole intersects perpendicularly with the axis of the radial air suspension bearing.

[0008] In some embodiments, the air entraining hole set comprises two symmetrically arranged second air entraining holes, and center lines of the two second air entraining holes both intersect perpendicularly with the axis of the radial air suspension bearing, and an included angle γ of the center lines of the two second air entraining holes satisfies: 0 degrees < γ < 180 degrees.

[0009] In some embodiments, γ < 60 degrees.

[0010] In some embodiments, when the air entraining hole set comprises a first air entraining hole, a center line of the first air entraining hole intersects perpendicularly with the axis of the radial air suspension bearing, the center lines of the two second air entraining holes are symmetric about the center line of the first air entraining hole, and a gas outlet direction of each of the second air entraining holes has a first component in the direction of the center line of the first air entraining hole, and the direction of each of the first components is the same as the gas outlet direction of the first air entraining hole.

[0011] In some embodiments, the number of the air entraining hole sets is more than two, and the air entraining hole sets are arranged in sequence along the axial direction of the radial air suspension bearing.

[0012] In some embodiments, the number of the air entraining hole sets is two, and the two air entraining hole sets are a first air entraining hole set and a second air entraining hole set, respectively, center lines of air entraining holes in the first air entraining hole set are located on a first plane, and center lines of air entraining holes in the second air entraining hole set are located on a second plane; the first plane and the second plane are arranged in parallel, and both are perpendicular to the axis of the radial air suspension bearing.

[0013] wherein the first plane and the second plane are symmetric about the axial center plane of the radial air suspension bearing, and the distance between the first plane and the second plane is d2, the axial length of the radial air suspension bearing is L, and d2 is greater than L / 2.

[0014] The utility model also provides a rotor system, which comprises the radial air suspension bearing of any one of the above-mentioned embodiments.

[0015] In some embodiments, the rotating shaft has a first section for the radial air suspension bearing to be sleeved, and a gas collection groove is arranged on the outer wall of the first section and extends along the axial direction of the rotating shaft, and the two ends of the gas collection groove along the axial direction of the rotating shaft are respectively a first end and a second end; wherein the gas collection groove is used to draw air through the first end and the second end when the rotating shaft rotates, so that the air at the first end and the air at the second end are collected to the middle part of the gas collection groove.

[0016] In some embodiments, the gas collection groove has a first groove section and a second groove section connected in sequence along the axial direction of the rotating shaft, the first groove section has the first end, the second groove section has the second end, and the first groove section and the second groove section are both arranged in a V shape.

[0017] In some embodiments, the groove depth of the gas collection groove is h, h = 0.1-0.3 mm;

[0018] And / or, the included angle between the first groove section and the second groove section is β, β = 90-120°;

[0019] And / or, the first groove section and the second groove section are symmetrically arranged, the width of the first end and the second end is both d1, d1 = 1-3 mm.

[0020] In some embodiments, when the air guide structure includes an air guide hole group arranged on the radial air suspension bearing, and the air guide structure provides support for the rotating shaft by introducing air through the air guide hole group; the number of the air guide hole group is two, and the two are respectively a first air guide hole group and a second air guide hole group; the center line of each air guide hole in the first air guide hole group is located on a first plane, and the center line of each air guide hole in the second air guide hole group is located on a second plane; the first plane and the second plane are both arranged in parallel, and both are perpendicular to the axis of the radial air suspension bearing; when the first plane and the second plane are symmetric about the axial center plane of the radial air suspension bearing, the first end intersects the first plane, and the second end intersects the second plane.

[0021] In some embodiments, the first groove section and the second groove section are both symmetric about the axial center plane of the radial air suspension bearing; the distance between the first plane and the second plane is d2, the maximum distance between the first end and the second end is d3, and the width of the first end and the second end is both d1, wherein d3 = d2-d1.

[0022] In some embodiments, the number of the gas collection grooves is more than two, and they are uniformly arranged in the circumferential direction of the first section.

[0023] The utility model also provides an air circulating machine, it includes the radial air suspension bearing of any one of the above, or including the rotor system of any one of the above.

[0024] In some embodiments, the air circulating machine has a turbine volute, and the bleed air structure is configured to bleed air from within the turbine volute.

[0025] The radial air suspension bearing, the rotor system and the air circulating machine provided by the utility model have the following advantages

[0026] Advantages:

[0027] 1. When the rotor system is in the start-stop stage, high-pressure gas can be introduced into the rotor system through the bleed air structure to provide support for the rotating shaft, so that the rotating shaft can be prevented from contacting the side wall of the radial air suspension bearing under the action of its own gravity, thereby avoiding friction loss between the rotating shaft and the bearing in the start-stop stage of the rotor system, and the service life of the rotating shaft and the bearing is improved.

[0028] 2. The radial air suspension bearing is fixed, and the rotating shaft rotates at high speed inside the radial air suspension bearing. The higher the rotating speed of the rotating shaft, the more air is drawn into the middle part of the gas collection groove from both ends of the gas collection groove and collected, and the higher the air pressure in the middle part of the gas collection groove, so that the high-pressure area of the inner surface of the radial air suspension bearing can be widened, the gas film thickness is increased, the load of the radial air suspension bearing is improved, and the rotating shaft can stably operate at a lower rotating speed, so that the rotor system can operate more stably and in a wider rotating speed range, and the wear is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. The drawings in the following description are only exemplary, and those skilled in the art can also obtain other implementation drawings according to the provided drawings without creating creative labor.

[0030] Figure 1 It is the structure schematic view of the air circulating machine in the prior art;

[0031] Figure 2 It is the structure schematic view of the rotor system of the air circulating machine in the prior art; Figure 1

[0032] Figure 3 It is the structure schematic view of the rotor system provided by an embodiment of the utility model;

[0033] Figure 4 It is the sectional view of the radial air suspension bearing provided by an embodiment of the utility model;

[0034] ​Figure 5 is a sectional view of another perspective of the radial air bearing;

[0035] Figure 6 is a structural schematic view of the gas collecting groove.

[0036] The reference signs are:

[0037] 1, turbine; 2, compressor; 3, fan; 4, first radial air bearing; 5, second radial air bearing; 6, bleed hole group; 10, radial air bearing; 20, rotating shaft; 21, first section; 22, gas collecting groove; 61, first bleed hole group; 62, second bleed hole group; 101, compressor inlet; 102, compressor outlet; 103, turbine inlet; 104, turbine outlet; 221, first groove section; 222, second groove section; 601, first plane; 602, second plane; 603, axial center plane; M, air outlet direction of the second bleed hole; M1, first component; m1, center line of the first bleed hole; m2, center line of the second bleed hole; 2a, first end; 2b, second end; 2c, middle part of the gas collecting groove; 6a, first bleed hole; 6b, second bleed hole. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be apparently and completely described in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is only illustrative in nature and by no means as any limitation to the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative labor fall within the scope of protection of the present application.

[0039] In the description of the present application, it is understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation to the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0040] For purposes of the description hereinafter, spatial relations terms are used, such as "above", "below", "upper", "lower", and the like, relative to the device as shown in the figures. It is to be understood that the spatial terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device is inverted consistent with its being turned over or reversed from the orientation shown in the figures, parts described as above other parts or elements would then be oriented below the other parts or elements. Accordingly, the examples "above" and "below" can encompass both orientations "above" and "below". The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial descriptions used herein interpreted accordingly.

[0041] In addition, it should be noted that the use of "first", "second", and the like words of distinction do not carry special meaning and are used only to distinguish one part from another, unless otherwise stated. Thus, the use of such words is not to be construed as limiting the scope of the present application.

[0042] With reference to the accompanying drawings Figures 3-5 As shown in the drawings, according to the embodiments of the present application, a radial gas suspension bearing 10 is provided for supporting the radial direction of the rotating shaft 20. The radial gas suspension bearing 10 is provided with a gas introduction structure. The gas introduction structure is used to introduce gas to support the rotating shaft 20, so as to prevent the rotating shaft 20 from contacting the side wall of the radial gas suspension bearing 10 under the action of its own gravity.

[0043] In the above example, when the rotor system is in the start-stop phase, high-pressure gas can be introduced by the gas introduction structure to support the rotating shaft 20, so as to prevent the rotating shaft 20 from contacting the side wall of the radial gas suspension bearing 10 under the action of its own gravity. Thus, the frictional loss between the rotating shaft 20 and the bearing during the start-stop phase of the rotor system can be avoided, and the service life of the rotating shaft 20 and the bearing is improved.

[0044] In order to achieve the function of the aforementioned gas introduction structure, in some embodiments, as shown in the drawings, Figures 3-5 As shown in the drawings, the aforementioned gas introduction structure can include a gas introduction hole group 6 arranged on the radial gas suspension bearing 10. The gas introduction holes in the gas introduction hole group 6 pass through from the outer side wall to the inner side wall of the radial gas suspension bearing 10. The gas introduction structure introduces gas through the gas introduction hole group 6 to support the rotating shaft 20, so as to prevent the rotating shaft 20 from contacting the side wall of the radial gas suspension bearing 10 under the action of its own gravity.

[0045] In some embodiments, as shown in the drawings, Figure 5As shown, the aforementioned air inlet hole group 6 can include a first air inlet hole 6a, a center line m1 of which is perpendicular to the axis of the radial air suspension bearing 10.

[0046] In the above example, when the radial air suspension bearing 10 of the present application is assembled with the rotating shaft 20, if the axis of the rotating shaft 20 is horizontally arranged, the first air inlet hole 6a can be directly opposite to the bottom of the rotating shaft 20, and the gas of the first air inlet hole 6a can provide a vertical upward force to the rotating shaft 20 to overcome the gravity of the rotating shaft 20, so that the rotating shaft 20 can be suspended without contacting the side wall of the radial air suspension bearing 10.

[0047] In some embodiments, as shown in FIG. 2, the aforementioned air inlet hole group 6 can include a second air inlet hole 6b. Figure 5 As shown, the aforementioned air inlet hole group 6 can include two symmetrically arranged second air inlet holes 6b. The center lines m2 of the two second air inlet holes are both perpendicular to the axis of the radial air suspension bearing 10, and the included angle γ of the center lines m2 of the two second air inlet holes satisfies: 0 degrees < γ < 180 degrees.

[0048] In the above example, when the radial air suspension bearing 10 of the present application is assembled with the rotating shaft 20, if the axis of the rotating shaft 20 is horizontally arranged, the two second air inlet holes 6b can be opposite to the lower part of the rotating shaft 20, and the center lines m2 of the two second air inlet holes are symmetric about the vertical direction. At this time, the gas of the two second air inlet holes 6b can provide a support force to the rotating shaft 20, which can be decomposed into a horizontal component and a vertical component. The horizontal components of the gas of the two second air inlet holes 6b applied to the rotating shaft 20 are equal in size and opposite in direction, so that the horizontal components of the gas of the two second air inlet holes 6b applied to the rotating shaft 20 cancel each other out. The vertical components of the gas of the two second air inlet holes 6b applied to the rotating shaft 20 are both vertically upward, and the two vertical components can overcome the gravity of the rotating shaft 20, so that the rotating shaft 20 can be suspended without contacting the side wall of the radial air suspension bearing 10.

[0049] In some embodiments, the aforementioned γ < 60 degrees, so as to reduce the air inlet loss and improve the support effect. When designing the second air inlet hole 6b, a preliminary γ value is first determined, and then the diameter of the second air inlet hole and the air inlet pressure are obtained according to the force balance, but are related to the size of the rotating shaft 20. According to the air inlet flow demand, the diameter of the second air inlet hole 6b cannot be too large, so a suitable value can be obtained. Preferably, the aforementioned γ = 30°.

[0050] In some embodiments, as shown in FIG. 3, the aforementioned air inlet hole group 6 can include a third air inlet hole 6c. Figure 5As shown, when the air intake hole group 6 includes a first air intake hole 6a, and the center line m1 of the first air intake hole intersects perpendicularly with the axis of the radial air suspension bearing 10, the center lines m2 of the two second air intake holes are symmetrical about the center line m1 of the first air intake hole, and the air outlet direction M of each second air intake hole 6b has a first component M1 in the direction of the center line m1 of the first air intake hole, and the direction of each first component M1 is the same as the air outlet direction of the first air intake hole 6a.

[0051] In the above example, the above arrangement allows the second air vent 6b and the first air vent 6a to be located on the same side of the rotating shaft 20. When assembling the radial air suspension bearing 10 of the present invention with the rotating shaft 20, if the axis of the rotating shaft 20 is horizontally set, the first air vent 6a and the two second air vents 6b can be opposite to the lower part of the rotating shaft 20. At this time, the first air vent 6a and the two second air vents 6b can provide a vertically upward force to the rotating shaft 20, thereby overcoming the gravity of the rotating shaft 20 and allowing the rotating shaft 20 to suspend without contacting the side wall of the radial air suspension bearing 10.

[0052] In some implementations, such as Figure 4 As shown, the number of the aforementioned air intake hole groups 6 can be two or more, and they are arranged sequentially at intervals along the axial direction of the radial air suspension bearing 10.

[0053] In the above example, the combination of a larger number of air vents 6 can improve the support effect on the rotating shaft 20, ensuring that the rotating shaft 20 can be suspended without contacting the side wall of the radial air suspension bearing 10.

[0054] In some implementations, such as Figure 4 As shown, the aforementioned air intake hole group 6 can be two, namely a first air intake hole group 61 and a second air intake hole group 62. The center line of each air intake hole in the first air intake hole group 61 is located on the first plane 601, and the center line of each air intake hole in the second air intake hole group 62 is located on the second plane 602. The first plane 601 and the second plane 602 are arranged in parallel, and both are perpendicular to the axis of the radial air suspension bearing 10. The first plane 601 and the second plane 602 are symmetrical about the axial center plane 603 of the radial air suspension bearing 10, and the distance between the first plane 601 and the second plane 602 is d2, the axial length of the radial air suspension bearing 10 is L, and d2 is greater than L / 2. Preferably, d2 = 2 * L / 3.

[0055] The value of d2 relative to L has a certain impact on the support stability of the rotating shaft 20. In the example above, by making d2 greater than L / 2, the stability of the support of the two air vent groups 6 on the rotating shaft 20 can be guaranteed.

[0056] In some embodiments, the diameter of each air hole in the air hole group 6 is related to the weight of the rotating shaft 20 and the air pressure. According to the weight of the rotating shaft 20, the diameter of each air hole in the air hole group 6 is d, and according to F = P * S, the diameter of each air hole in the air hole group 6 is 1.5 mm to 3.6 mm. Preferably, d = 3 mm.

[0057] As shown in Figure 3 The utility model also provides a rotor system which can include the radial air bearing 10 of any one of the above. Because the rotor system uses the radial air bearing 10, when the rotor system starts and stops, the rotating shaft 20 can be supported by the gas introduced by the air introduction structure to prevent the rotating shaft 20 from contacting the side wall of the radial air bearing 10 under the action of its own gravity, thereby avoiding the friction loss between the rotating shaft 20 and the bearing during the start and stop of the rotor system and improving the service life of the rotating shaft 20 and the bearing.

[0058] In some embodiments, as shown in Figure 3 The rotating shaft 20 has a first section 21 for the radial air bearing 10 to be sleeved. The outer wall of the first section 21 is provided with a gas collection groove 22 extending along the axial direction of the rotating shaft 20. The two ends of the gas collection groove 22 along the axial direction of the rotating shaft 20 are respectively a first end 2a and a second end 2b. The gas collection groove 22 is used to draw gas through the first end 2a and the second end 2b when the rotating shaft 20 rotates, so that the gas at the first end 2a and the gas at the second end 2b are collected in the middle part 2c of the gas collection groove.

[0059] In the above example, the radial air bearing 10 is fixed, and the rotating shaft 20 rotates at high speed inside the radial air bearing 10. The higher the rotating speed of the rotating shaft 20, the more air is drawn into the middle part 2c of the gas collection groove 22 from the two ends of the gas collection groove 22 and collected, and the higher the air pressure in the middle part of the gas collection groove 22, thereby widening the high-pressure area of the inner surface of the radial air bearing 10, increasing the gas film thickness, and improving the load capacity of the radial air bearing 10, so that the rotating shaft 20 can also operate stably at a lower rotating speed, thereby making the rotor system more stable and capable of operating in a wider rotating speed range and reducing wear.

[0060] To realize the function of the gas collection groove 22, the gas collection groove 22 is used to draw gas through the first end 2a and the second end 2b when the rotating shaft 20 rotates, so that the gas at the first end 2a and the gas at the second end 2b are collected in the middle part 2c of the gas collection groove. In some embodiments, as shown in Figure 3 The gas collection groove 22 has a first groove section 221 and a second groove section 222 connected in sequence along the axial direction of the rotating shaft 20. The first groove section 221 has the first end 2a, and the second groove section 222 has the second end 2b. The first groove section 221 and the second groove section 222 are both V-shaped.

[0061] In the above example, the gas collecting groove 22 is designed as a V-shaped groove. Similar to tire drainage, the V-shaped groove arrow direction is consistent with the rotation direction, which is easy to drain. In this application, it is desirable that the gas flow is not easily dispersed, which plays a supporting role for the rotating shaft 20. Therefore, in actual use, the rotating direction of the rotating shaft 20 can be opposite to the arrow direction of the V-shaped groove, so that the V-shaped groove can draw gas through the first end 2a and the second end 2b when the rotating shaft 20 rotates, and the gas at the first end 2a and the gas at the second end 2b converge at the inflection point in the middle of the V-shaped groove to improve the carrying capacity of the rotating shaft 20, so that the rotating shaft 20 can obtain a lower stable operating speed, so that the rotor system can be more stable and can operate in a wider speed range, and the wear is reduced.

[0062] In some embodiments, both the first groove section 221 and the second groove section 222 described above can also be arranged in a herringbone shape.

[0063] In some embodiments, the groove depth of the aforementioned gas collecting groove 22 is h, h = 0.1-0.3mm. Preferably, h = 0.2mm. Wherein the gas belongs to viscous compressible gas, the depth h of the gas collecting groove 22 has a greater impact on the carrying capacity of the bearing-rotor system, and by making h = 0.1-0.3mm, the rotating shaft 20 can have a stable operating speed.

[0064] In some embodiments, as shown in Figure 6 The angle between the first groove section 221 and the second groove section 222 described above is β, β = 90-120°. Preferably, β = 112°. Wherein the setting of the β angle has a greater impact on the bearing carrying capacity, and by making β = 90-120°, the rotating shaft 20 can have a stable operating speed.

[0065] In some embodiments, as shown in Figure 3 The first groove section 221 and the second groove section 222 described above are symmetrically arranged, the width of the first end 2a and the second end 2b is d1, and d1 = 1-3mm. Preferably, d1 = 1.5mm. Wherein the setting of d1 has a greater impact on the bearing carrying capacity, and by making d1 = 1-3mm, the rotating shaft 20 can have a stable operating speed.

[0066] In some embodiments, as shown in Figure 3As shown, when the air lead structure includes the air lead hole set 6 arranged on the radial air suspension bearing 10, and the air lead structure provides support to the rotating shaft 20 by introducing gas through the air lead hole set 6; the number of the air lead hole set 6 is two, and respectively the first air lead hole set 61 and the second air lead hole set 62; the center line of each air lead hole in the first air lead hole set 61 is located on the first plane 601, and the center line of each air lead hole in the second air lead hole set 62 is located on the second plane 602; the first plane 601 and the second plane 602 are both arranged in parallel, and both are perpendicular to the axis of the radial air suspension bearing 10; when the first plane 601 and the second plane 602 are both symmetric about the axial center plane 603 of the radial air suspension bearing 10, the first end 2a intersects the first plane 601, and the second end 2b intersects the second plane 602.

[0067] In the above example, by making the first end 2a intersect the first plane 601, it is beneficial to make the gas of the first air lead hole set 61 flow into the first end 2a. And by making the second end 2b intersect the second plane 602, it is beneficial to make the gas of the second air lead hole set 62 flow into the second end 2b.

[0068] In some embodiments, as shown in Figure 4 and Figure 6 the first groove segment 221 and the second groove segment 222 are both symmetric about the axial center plane 603 of the radial air suspension bearing 10. The distance between the first plane 601 and the second plane 602 is d2, the maximum distance between the first end 2a and the second end 2b is d3, and the width of the first end 2a and the second end 2b is both d1, where d3=d2-d1.

[0069] In the above example, by making d3=d2-d1, it is beneficial to make the gas of the first air lead hole set 61 flow into the first end 2a, and make the gas of the second air lead hole set 62 flow into the second end 2b, so as to facilitate the air lead to the middle part 2c of the gas collection groove, and further improve the rotor-bearing load.

[0070] In some embodiments, as shown in Figure 3 the number of the aforementioned gas collection grooves 22 is more than two, and is uniformly arranged in the circumferential direction of the first segment 21, which is beneficial to increase the gas film thickness and further improve the load of the radial air suspension bearing 10, so that the rotating shaft 20 can also operate stably at a lower speed.

[0071] In some embodiments, the number of the aforementioned gas collection grooves 22 should be between 13 and 16, and the number and groove area of the gas collection grooves 22 have a great influence on the load of the rotating bearing. According to the size and weight of the rotating shaft and the size of the air lead pressure, the preferred number of the gas collection grooves 22 can be 14.

[0072] In the above scheme, the air guide hole group 6 is arranged on the radial air suspension bearing 10, by reducing the pressure of the radial air suspension bearing 10, the static friction of the rotating shaft 20 is reduced, the wear of the rotating shaft 20 and the radial air suspension bearing 10 is reduced, and the service life of the rotor system is prolonged. In the processing of the matched shaft, the V-shaped gas collecting groove 22 is opened on the rotating shaft 20, the high gas film pressure is formed in the gas collecting groove 22, the high pressure area of the bearing surface is widened, the gas film thickness of the inner side of the bearing is increased, the load of the radial air suspension bearing 10 is improved, and the radial air suspension bearing 10 can also stably operate at a lower rotating speed.

[0073] In some embodiments, the air circulating machine can include the radial air suspension bearing 10 of any one of the above, or include the rotor system of any one of the above. Since the air circulating machine adopts the radial air suspension bearing 10 or the rotor system, when the rotor system is started and stopped, the gas introduced by the air guide structure can support the rotating shaft 20 to prevent the rotating shaft 20 from contacting the side wall of the radial air suspension bearing 10 under the action of its own gravity, thereby avoiding the friction loss between the rotating shaft 20 and the bearing during the start and stop of the rotor system, and improving the service life of the rotating shaft 20 and the bearing.

[0074] In some embodiments, the air circulating machine has a turbine volute, and the air guide structure is used to guide air from the turbine volute to introduce high-pressure gas in the turbine volute, which is conducive to forming a gas film to support the rotating shaft 20. The air guide structure can include an air guide pipe for connecting the inside of the turbine volute and each air guide hole in the air guide hole group 6 to introduce high-pressure gas in the turbine volute into each air guide hole in the air guide hole group 6.

[0075] It should be noted that the gas collecting groove 22 and the air guide hole group 6 cooperate to optimize the start and stop process of the rotor system of the air circulating machine, reduce the loss of the rotor system, reduce the wear of the rotor system, improve the stability of the rotor system, and prolong the service life of the rotor system. In addition, the structure of the gas collecting groove 22 and the air guide hole group 6 is simple to process, which is conducive to reducing the production cost.

[0076] It is easy for those skilled in the art to understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0077] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A radial air gas suspension bearing (10) for providing radial support to a rotating shaft (20), characterized in that: The radial air suspension bearing (10) is provided with an air guiding structure for guiding air to support the rotating shaft (20) to prevent the rotating shaft (20) from contacting the side wall of the radial air suspension bearing (10) under the action of gravity; The air guiding structure comprises an air guiding hole group (6) arranged on the radial air suspension bearing (10), and the air guiding holes in the air guiding hole group (6) penetrate from the outer side wall to the inner side wall of the radial air suspension bearing (10); wherein the air guiding structure guides air through the air guiding hole group (6) to support the rotating shaft (20); The air guiding hole group (6) comprises two symmetrically arranged second air guiding holes, the center lines (m2) of the two second air guiding holes are both perpendicular to the axis of the radial air suspension bearing (10), and the included angle γ of the center lines (m2) of the two second air guiding holes satisfies: 0 degrees < γ < 180 degrees.

2. The radial air suspension bearing (10) according to claim 1, wherein: The air guiding hole group (6) comprises a first air guiding hole (6a), and the center line (m1) of the first air guiding hole is perpendicular to the axis of the radial air suspension bearing (10).

3. The radial air suspension bearing (10) according to claim 1, wherein: γ < 60 degrees.

4. The radial air suspension bearing (10) according to claim 1, wherein: When the air guiding hole group (6) comprises a first air guiding hole (6a), the center line (m1) of the first air guiding hole is perpendicular to the axis of the radial air suspension bearing (10), the center lines (m2) of the two second air guiding holes are symmetric about the center line (m1) of the first air guiding hole, and the air outlet directions (M) of the two second air guiding holes (6b) each have a first component (M1) in the direction of the center line (m1) of the first air guiding hole, and the directions of the first components (M1) are the same as the air outlet direction of the first air guiding hole (6a).

5. The radial air suspension bearing (10) according to any one of claims 1-4, wherein: The number of the air guiding hole groups (6) is more than two, and the air guiding hole groups (6) are arranged in sequence along the axial direction of the radial air suspension bearing (10).

6. The radial air suspension bearing (10) according to claim 5, wherein: The number of the air guiding hole groups (6) is two, and the two air guiding hole groups are a first air guiding hole group (61) and a second air guiding hole group (62), the center lines of the air guiding holes in the first air guiding hole group (61) are located on a first plane (601), and the center lines of the air guiding holes in the second air guiding hole group (62) are located on a second plane (602); the first plane (601) and the second plane (602) are both arranged in parallel, and both are perpendicular to the axis of the radial air suspension bearing (10). The first plane (601) and the second plane (602) are both symmetric about an axial center plane (603) of the radial air suspension bearing (10), and a distance between the first plane (601) and the second plane (602) is d2, an axial length of the radial air suspension bearing (10) is L, and d2 is greater than L / 2.

7. A rotor system characterized by: The rotor system comprises the radial air suspension bearing (10) according to any one of claims 1-6.

8. The rotor system according to claim 7, characterized in that: The rotating shaft (20) has a first section (21) for sleeving the radial air suspension bearing (10), and a gas collecting groove (22) is arranged on an outer wall of the first section (21) and extends in an axial direction of the rotating shaft (20), and the gas collecting groove (22) has a first end (2a) and a second end (2b) at two axial ends of the rotating shaft (20); wherein the gas collecting groove (22) is used for collecting gas at the first end (2a) and the second end (2b) of the rotating shaft (20) during rotation of the rotating shaft (20), so that the gas at the first end (2a) and the gas at the second end (2b) are collected to a middle part (2c) of the gas collecting groove.

9. The rotor system according to claim 8, characterized in that: The gas collecting groove (22) has a first groove section (221) and a second groove section (222) connected in sequence in the axial direction of the rotating shaft (20), the first groove section (221) has the first end (2a), the second groove section (222) has the second end (2b), and the first groove section (221) and the second groove section (222) are both arranged in a V shape.

10. The rotor system according to claim 9, characterized in that: The groove depth of the gas collecting groove (22) is h, and h = 0.1-0.3 mm; And / or, an included angle between the first groove section (221) and the second groove section (222) is β, and β = 90-120°; And / or, the first groove section (221) and the second groove section (222) are both symmetrically arranged, and the width of the first end (2a) and the second end (2b) is both d1, and d1 = 1-3 mm.

11. The rotor system according to claim 9 or 10, characterized in that: When the air guide structure comprises an air guide hole group (6) arranged on the radial air suspension bearing (10), and the air guide structure provides support for the rotating shaft (20) by introducing gas through the air guide hole group (6); the number of the air guide hole group (6) is two, and the air guide hole group (6) is respectively a first air guide hole group (61) and a second air guide hole group (62); the center line of each air guide hole in the first air guide hole group (61) is located on a first plane (601), and the center line of each air guide hole in the second air guide hole group (62) is located on a second plane (602); the first plane (601) and the second plane (602) are arranged in parallel, and both are perpendicular to the axis of the radial air suspension bearing (10); when the first plane (601) and the second plane (602) are symmetrical about the axial center plane (603) of the radial air suspension bearing (10), the first end (2a) intersects the first plane (601), and the second end (2b) intersects the second plane (602).

12. The rotor system according to claim 11, wherein: the first slot section (221) and the second slot section (222) are symmetrical about the axial center plane (603) of the radial air suspension bearing (10); the distance between the first plane (601) and the second plane (602) is d2, the maximum distance between the first end (2a) and the second end (2b) is d3, and the width of the first end (2a) and the second end (2b) is d1, wherein d3 = d2 - d1.

13. The rotor system according to any one of claims 8-10, 12, wherein: the number of the gas collection slots (22) is more than two, and the gas collection slots (22) are uniformly arranged in the circumferential direction of the first section (21).

14. An air circulating machine characterized by: The radial air suspension bearing (10) according to any one of claims 1-6; or the rotor system according to any one of claims 7-13.

15. The air circulating machine of claim 14, wherein: The air circulation machine has a turbine volute, and the air guide structure is used to guide air from the turbine volute.

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