A rotor assembly and electric machine

Abstract

The application provides a rotor assembly and a motor, and the rotor assembly comprises a rotating shaft and a gas bearing, the rotating shaft comprises an axial end face, a gas guide area I and a bearing area, the bearing area is located on the outer circumferential surface of the rotating shaft and is used for being connected with the gas bearing, the gas guide area I is located on the outer circumferential surface of the rotating shaft and is connected with the axial end face, and the bearing area is connected with the gas guide area I; a first gas guide groove is arranged on the axial end face, a second gas guide groove is arranged on the gas guide area I, the first gas guide groove can introduce external gas, one end of the second gas guide groove is communicated with the first gas guide groove, and the other end of the second gas guide groove can guide the gas to the bearing area and into the gap between the rotating shaft and the gas bearing. According to the application, the gas can be introduced and pressurized into the radial rotating system, the gas suction flow of the gas bearing is improved, the air inlet is prevented from being blocked, the bearing capacity of the bearing is improved, and the problem that the foil gas dynamic pressure bearing is blocked due to high rotating speed, the bearing and the rotating shaft are locked, and the motor is disabled is solved.

Description

Technical Field

[0001] This invention relates to the field of gas bearing technology, and more specifically to a rotor assembly and a motor. Background Technology

[0002] Gas hydrodynamic bearings have advantages such as high precision, no pollution, high speed and simple structure. They have been widely used in high-speed rotating machinery such as oil-free turbines for aero engines, micro gas turbines and air circulation machines for aircraft, both domestically and internationally.

[0003] CN 211343130 U proposes a rotor system and a micro gas turbine, including a shaft, a motor, a radial bearing, a compressor, a thrust bearing, and a turbine; air slots are designed in the thrust bearing and shaft to achieve airflow guidance. CN 109944871A proposes a hydrodynamic radial bearing and a centrifugal pump, including a hydrodynamic radial bearing and a centrifugal pump, with axial flow boosting structures on both sides of the bearing body to suppress cavitation in the hydrodynamic bearing and improve bearing reliability.

[0004] Because existing foil gas dynamic bearings suffer from technical problems such as bearing seizure due to air intake blockage at high speeds, leading to motor failure, this invention researches and designs a rotor assembly and a motor. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the foil gas dynamic bearing in the prior art that causes the bearing and the shaft to seize due to air intake blockage at high speed, resulting in motor failure, thereby providing a rotor assembly and a motor.

[0006] To address the above problems, the present invention provides a rotor assembly comprising:

[0007] A rotating shaft and a gas bearing are provided. The rotating shaft includes an axial end face, a gas guiding area, and a bearing area. The bearing area is located on the outer circumferential surface of the rotating shaft and is used to connect with the gas bearing to support the rotating shaft. The gas guiding area is located on the outer circumferential surface of the rotating shaft and is connected to the axial end face. The bearing area is connected to the gas guiding area. A first gas duct is provided on the axial end face, and a second gas duct is provided on the gas guiding area. The first gas duct can introduce external gas, and one end of the second gas duct is connected to the first gas duct, while the other end can guide the gas to the bearing area and into the gap between the rotating shaft and the gas bearing.

[0008] In some implementations...

[0009] The first air intake groove is a groove structure formed on the axial end face. One end of the first air intake groove is spaced at a preset distance greater than 0 from the radial outer edge of the axial end face, forming a gas inlet. The other end of the first air intake groove is located at the radial outer edge of the axial end face, forming a gas outlet. External gas can enter the first air intake groove through the gas inlet, and the gas in the first air intake groove can enter the second air intake groove through the gas outlet.

[0010] In some implementations...

[0011] The distance between the gas inlet and the center of the axial end face is greater than 0; the flow cross-sectional area of ​​the first gas duct gradually increases along the direction from the gas inlet to the gas outlet.

[0012] In some implementations...

[0013] The first gas vent has an arc-shaped groove structure. The gas inlet and the gas outlet are offset in the radial direction. The circumferential direction from the gas inlet to the gas outlet is the same as the rotation direction of the rotating shaft.

[0014] In some implementations...

[0015] The second air intake groove is a groove structure formed on the outer peripheral surface of the rotating shaft. One end of the second air intake groove is located at the axial end of the outer peripheral surface of the rotating shaft, forming a second gas inlet. The second gas inlet is connected to and communicates with the first gas outlet. The other end of the second air intake groove extends to a position connected to the bearing area, forming a second gas outlet, so that the gas in the first air intake groove can reach the bearing area through the second air intake groove and enter the gap between the gas bearing and the rotating shaft.

[0016] In some implementations...

[0017] The second gas vent has an arc-shaped groove structure. The second gas inlet and the second gas outlet are offset in the axial direction. The circumferential direction from the second gas inlet to the second gas outlet is the same as the rotation direction of the rotating shaft.

[0018] And / or, along the direction from the second gas inlet to the second gas outlet, the flow cross-sectional area of ​​the second gas duct gradually increases.

[0019] In some implementations...

[0020] Both the first and second air intake grooves have a spiral groove structure, and the groove depth of both the first and second air intake grooves is 0.01mm-0.05mm.

[0021] In some implementations...

[0022] There are multiple first air intake grooves, which are spaced apart along the circumferential direction on the axial end face; there are multiple second air intake grooves, which are spaced apart along the circumferential direction on the outer circumferential surface of the rotating shaft; the second air intake grooves correspond one-to-one with the first air intake grooves and are connected; and / or,

[0023] The gas bearing completely covers the load-bearing area, and the gas bearing also covers the gas outlet.

[0024] In some implementations...

[0025] It also includes a second gas guiding area. The first gas guiding area is connected to one axial end of the bearing area. The second gas guiding area is located on the outer circumferential surface of the rotating shaft and is connected to the other axial end of the bearing area. The second gas guiding area is provided with a third air duct. One end of the third air duct can introduce air from the middle of the rotating shaft or the motor cavity, and the other end can guide the gas to the bearing area and into the gap between the rotating shaft and the gas bearing.

[0026] In some implementations...

[0027] The third air intake groove is a groove structure formed on the outer peripheral surface of the rotating shaft. One end of the third air intake groove is spaced at a distance greater than 0 from the other end of the axial direction of the bearing area, forming a gas inlet three. The other end of the third air intake groove extends to a position connected with the bearing area, forming a gas outlet three, so that the gas in the third air intake groove can reach the bearing area and enter the gap between the gas bearing and the rotating shaft.

[0028] In some implementations...

[0029] The third gas vent has an arc-shaped groove structure. The gas inlet three and the gas outlet three are offset in the axial direction. The circumferential direction from the gas inlet three to the gas outlet three is the same as the rotation direction of the rotating shaft.

[0030] And / or, along the direction from the gas inlet three to the gas outlet three, the flow cross-sectional area of ​​the third gas duct gradually increases.

[0031] In some implementations...

[0032] The third air intake groove has a spiral groove structure, and the groove depth of the third air intake groove is 0.01mm-0.05mm.

[0033] In some implementations...

[0034] There are multiple third air intake slots, and these multiple third air intake slots are spaced apart along the circumferential direction on the outer circumferential surface of the rotating shaft; and / or,

[0035] The gas bearing completely covers the load-bearing area, and in some embodiments, the gas bearing also covers the gas outlet.

[0036] The height of the outer peripheral surface of the bearing area is lower than the height of the gas guiding area one where the second air intake groove is not opened, that is, the radial radius of the outer peripheral surface of the bearing area is smaller than the radial radius of the gas guiding area one where the second air intake groove is not opened; the height of the outer peripheral surface of the bearing area is lower than the height of the gas guiding area two where the third air intake groove is not opened, that is, the radial radius of the outer peripheral surface of the bearing area is smaller than the radial radius of the gas guiding area two where the third air intake groove is not opened; so as to form a groove in the bearing area.

[0037] In some implementations...

[0038] The radial radius of the outer periphery of the bearing area is 0.02mm-0.1mm smaller than the radial radius of the gas guiding area one where the second air intake groove is not opened; the radial radius of the outer periphery of the bearing area is 0.02mm-0.1mm smaller than the radial radius of the gas guiding area two where the third air intake groove is not opened.

[0039] In some implementations...

[0040] The gas bearing further includes a flat foil and a corrugated foil. The flat foil includes a flat foil bearing section and a flat foil fixing section. The corrugated foil includes a corrugated foil flat section, a corrugated foil support section, and a corrugated foil fixing section. The flat foil bearing section is disposed on the outer periphery of the rotating shaft. The corrugated foil flat section is located on the outer periphery of the flat foil bearing section. The corrugated foil support section is connected to the corrugated foil flat section and protrudes toward the flat foil bearing section to support the flat foil bearing section. The first air duct and the second air duct can introduce gas into the gap between the bearing area and the flat foil bearing section.

[0041] The present invention also provides an electric motor comprising the aforementioned rotor assembly.

[0042] The rotor assembly and motor provided by this invention have the following beneficial effects:

[0043] 1. This invention provides a first air intake groove on the axial end face of a rotating shaft, a gas guide area 1 on the outer circumferential surface of the rotating shaft and at the junction with the bearing area, and a second air intake groove on the gas guide area 1. Gas can be introduced through the first air intake groove on the axial end face. The first air intake groove and the second air intake groove are connected. The gas can be introduced into the gap between the rotating shaft and the gas bearing in the bearing area through the first air intake groove on the axial end face and the second air intake groove on the outer circumferential surface. That is, the gas is introduced and pressurized into the radial rotation system, which effectively improves the gas bearing's intake flow rate, prevents air intake blockage, improves the bearing's load-bearing capacity, and solves the problem that existing foil gas dynamic bearings cause the bearing and rotating shaft to seize at high speeds due to air intake blockage, resulting in motor failure.

[0044] 2. The present invention also forms a groove structure in the bearing area by making the height of the outer peripheral surface of the bearing area lower than the height of the position where the second air vent is not opened in the first gas guiding area, and / or the height of the outer peripheral surface of the bearing area lower than the height of the position where the third air vent is not opened in the second gas guiding area, that is, the shaft has a shallow groove in the middle of the radial bearing position, which can facilitate the storage of high pressure gas in the bearing bearing area, reduce high pressure gas leakage, and improve the overall bearing performance of the radial rotation system. Attached Figure Description

[0045] Figure 1 This is a three-dimensional structural diagram of the shaft portion of the rotor assembly of the present invention;

[0046] Figure 2 This is a three-dimensional structural diagram of the rotor assembly of the present invention, consisting of a rotating shaft and a gas bearing.

[0047] Figure 3 yes Figure 2 Axial structural diagram.

[0048] The attached figures are labeled as follows:

[0049] 1. Rotating shaft; 2. Gas bearing; 3. Axial end face; 4. Gas guiding area one; 5. Bearing area; 6. First gas venting groove; 101. Gas inlet one; 102. Gas outlet one; 7. Second gas venting groove; 103. Gas inlet two; 104. Gas outlet two; 8. Gas guiding area two; 9. Third gas venting groove; 106. Gas outlet three; 107. Gas inlet three; 10. Flat foil; 11. Corrugated foil; 201. Flat foil fixing section; 202. Flat foil bearing section; 301. Corrugated foil fixing section; 302. Corrugated foil support section; 303. Corrugated foil flat section. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0052] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0053] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0054] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0055] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0056] like Figure 1-3 As shown, the present invention provides a rotor assembly comprising:

[0057] The rotating shaft 1 and the gas bearing 2 are provided. The rotating shaft 1 includes an axial end face 3, a gas guiding area 4, and a bearing area 5. The bearing area 5 is located on the outer peripheral surface of the rotating shaft 1 and is used to connect with the gas bearing 2. The gas bearing 2 supports the rotating shaft 1. The gas guiding area 4 is located on the outer peripheral surface of the rotating shaft 1 and is connected with the axial end face 3. The bearing area 5 is connected with the gas guiding area 4. A first gas duct 6 is provided on the axial end face 3, and a second gas duct 7 is provided on the gas guiding area 4. The first gas duct 6 can introduce external gas. One end of the second gas duct 7 is connected to the first gas duct 6, and the other end can guide the gas to the bearing area 5 and into the gap between the rotating shaft 1 and the gas bearing 2.

[0058] This invention provides a first air-guiding groove on the axial end face of a rotating shaft, and a gas guiding area on the outer circumferential surface of the rotating shaft at the junction with the bearing area. A second air-guiding groove is formed on the gas guiding area. Gas can be introduced through the first air-guiding groove on the axial end face. The first air-guiding groove and the second air-guiding groove are connected. The gas can be introduced into the gap between the rotating shaft and the gas bearing in the bearing area through the first air-guiding groove on the axial end face and the second air-guiding groove on the outer circumferential surface. That is, the gas is introduced and pressurized into the radial rotation system, which effectively improves the intake flow rate of the gas bearing, prevents intake blockage, improves the bearing capacity, and solves the problem of existing foil gas dynamic bearings causing the bearing and rotating shaft to seize at high speeds due to intake blockage, resulting in motor failure.

[0059] The improvement of this invention is as follows:

[0060] 1. In the radial rotation system (rotor assembly), the shaft is designed with helical grooves (i.e., first and second air intake grooves) at both ends and on both sides of the radial bearing position to introduce and pressurize gas (further optimized by the helical grooves through the arc grooves) into the interior of the radial rotation system, thereby improving the stability of the radial rotation system;

[0061] 2. In the radial rotation system, a shallow groove (i.e., the groove formed in the bearing area 5) is opened in the middle of the radial bearing position of the shaft to reduce high-pressure gas leakage and improve the bearing performance of the bearing system.

[0062] In some implementations...

[0063] The first air intake groove 6 is a groove structure formed on the axial end face 3. One end of the first air intake groove 6 is spaced from the radial outer edge of the axial end face 3 by a preset distance greater than 0, forming a gas inlet 101. The other end of the first air intake groove 6 is located at the radial outer edge of the axial end face 3, forming a gas outlet 102. External gas can enter the first air intake groove 6 through the gas inlet 101, and the gas in the first air intake groove 6 can enter the second air intake groove 7 through the gas outlet 102.

[0064] This is a preferred structural form of the first air intake groove of the present invention, namely, a groove formed on the axial end face, and the gas inlet of the first air intake groove is spaced apart from the radial outer edge, and the gas outlet of the first air intake groove is located at the radial outer edge. Therefore, when in use, by venting towards the axial end face of the rotating shaft, the gas is guided from the gas inlet to the gas outlet through the first air intake groove, and then guided to the second air intake groove on the outer circumferential surface of the rotating shaft.

[0065] In some implementations...

[0066] The distance between the gas inlet 101 and the center of the axial end face 3 is greater than 0; along the direction from the gas inlet 101 to the gas outlet 102, the flow cross-sectional area of ​​the first gas duct 6 gradually increases.

[0067] The gas inlet of the present invention is located radially outward from the center position, which can effectively guide the gas by utilizing the centrifugal force when the shaft rotates, guiding the gas from the gas inlet to the gas outlet. Furthermore, the present invention preferably gradually increases the cross-sectional area of ​​the flow from the gas inlet to the gas outlet, which can reduce the resistance of the channel as the airflow moves, thereby improving the gas intake efficiency as the shaft rotates, further increasing the intake volume at the gas bearing, and further improving the bearing capacity.

[0068] In some implementations...

[0069] The first gas venting groove 6 has an arc-shaped groove structure. The gas inlet 101 and the gas outlet 102 are offset in the radial direction. The direction from the gas inlet 101 to the gas outlet 102 along the circumferential direction is the same as the rotation direction of the rotating shaft 1.

[0070] This is a further preferred structural form of the first air intake groove of the present invention. The gas inlet and the gas outlet are offset in the radial direction, and the direction from the gas inlet to the gas outlet, that is, the extension direction of the first air intake groove (the circumferential direction), is consistent with the rotation direction of the rotating shaft. This can effectively utilize the centrifugal force generated by the rotation of the rotating shaft to effectively throw the gas in the first air intake groove to the gas outlet and then into the second air intake groove, thereby improving the air intake efficiency and the suction efficiency, increasing the suction volume, and improving the bearing capacity.

[0071] In some implementations...

[0072] The second air intake groove 7 is a groove structure formed on the outer peripheral surface of the rotating shaft 1. One end of the second air intake groove 7 is located at the axial end of the outer peripheral surface of the rotating shaft 1, forming a second gas inlet 103. The second gas inlet 103 is connected to and communicates with the first gas outlet 102. The other end of the second air intake groove 7 extends to the position connected to the bearing area 5, forming a second gas outlet 104, so that the gas in the first air intake groove 6 can reach the bearing area 5 through the second air intake groove 7 and enter the gap between the gas bearing 2 and the rotating shaft 1.

[0073] This is a preferred structural form of the second air intake groove of the present invention, namely, a groove formed on the outer peripheral surface of the rotating shaft, and the gas inlet of the second air intake groove is located at the radial outer edge to introduce gas from the first air intake groove, and the gas outlet of the second air intake groove extends to connect with the bearing area to effectively receive the gas introduced in the first air intake groove and guide it to the bearing area through the second air intake groove to provide gas support between the bearing and the rotating shaft.

[0074] In some implementations...

[0075] The second gas venting groove 7 has an arc-shaped groove structure. The second gas inlet 103 and the second gas outlet 104 are offset in the axial direction. The direction from the second gas inlet 103 to the second gas outlet 104 along the circumferential direction is the same as the rotation direction of the rotating shaft 1.

[0076] And / or, along the direction from the gas inlet 2 103 to the gas outlet 2 104, the flow cross-sectional area of ​​the second gas duct 7 gradually increases.

[0077] This is a further preferred structural form of the second air intake groove of the present invention. The second gas inlet and the second gas outlet are offset in the axial direction, and the direction from the second gas inlet to the second gas outlet, that is, the extension direction of the second air intake groove (the circumferential direction), is consistent with the rotation direction of the rotating shaft. This effectively utilizes the centrifugal force generated by the rotation of the rotating shaft to effectively throw the gas in the second air intake groove to the second gas outlet, and then into the bearing area, thereby improving the air intake efficiency and the suction efficiency, increasing the suction volume, and improving the bearing capacity. The flow cross-sectional area of ​​the second gas inlet to the second gas outlet gradually increases, which can reduce the resistance of the channel with the flow of air, and improve the air intake efficiency of the gas with the rotation of the rotating shaft, further increasing the suction volume at the gas bearing and further improving the bearing capacity.

[0078] In some implementations...

[0079] Both the first air-drawing groove 6 and the second air-drawing groove 7 are spiral groove structures, and the groove depth of both the first air-drawing groove 6 and the second air-drawing groove 7 is 0.01mm-0.05mm. This is the preferred structural form and preferred groove depth of the first and second air-drawing grooves of the present invention. The spiral grooves serve two purposes: firstly, to draw in air, and secondly, to pressurize the gas. The preferred groove depth can improve the air-drawing effect without affecting the structural strength of the shaft, thereby improving the bearing's support capacity.

[0080] The rotating shaft of this invention is designed with helical groove structures (i.e., first and second air intake grooves) at both the end and on both sides of the radial bearing position. Multiple helical grooves are evenly distributed along the radial direction of the rotating shaft at its outer circumference. The first air intake groove is wider at the outer edge and narrower at the inner edge, and deeper at the outer edge and shallower at the inner edge (i.e., the cross-sectional area gradually increases along the flow direction), making it easier to introduce gas into the internal gap of the bearing when the rotor shaft rotates, thus improving air intake efficiency. The depth is preferably designed to be between 0.01mm and 0.05mm. During shaft operation, gas is drawn into the first air intake groove 6 from the gas inlet 101 on the end face under centrifugal force and ejected from the gas outlet 102 onto the end face of the rotating shaft.

[0081] In some implementations...

[0082] There are multiple first air-guiding grooves 6, which are spaced apart along the circumferential direction on the axial end face 3; there are multiple second air-guiding grooves 7, which are spaced apart along the circumferential direction on the outer circumferential surface of the rotating shaft 1; the second air-guiding grooves 7 correspond one-to-one with the first air-guiding grooves 6 and are connected; and / or,

[0083] The gas bearing 2 completely covers the bearing area 5, and the gas bearing 2 also covers the gas outlet 104.

[0084] The first and second air intake slots of the present invention are preferably multiple slots spaced apart in the circumferential direction, which can enhance the gas supply to the bearing area in the circumferential direction, further improve the intake volume, and further improve the bearing capacity of the bearing; and the gas bearing of the present invention covers the bearing area and also covers the second gas outlet, which can effectively ensure that the gas flow discharged from the second gas outlet can effectively enter the interior of the bearing area and enhance the gas support for the rotating shaft, and the force of the gas support is provided by the gas bearing.

[0085] In some implementations...

[0086] It also includes a second gas guiding area 8, which is connected to one axial end of the first gas guiding area 4 and the second gas guiding area 8 is located on the outer circumferential surface of the rotating shaft and connected to the other axial end of the bearing area 5. A third air duct 9 is provided on the second gas guiding area 8. One end of the third air duct 9 can introduce air from the middle of the rotating shaft 1 or the motor cavity, and the other end can guide the gas to the bearing area 5 and into the gap between the rotating shaft 1 and the gas bearing 2.

[0087] The present invention further provides a second gas guiding area on the outer circumferential surface of the other end of the bearing area of ​​the rotating shaft, and provides a third air vent on the second gas guiding area. This structure can effectively introduce air from the middle of the rotating shaft 1 or the motor cavity into the bearing area 5, further enhancing the amount of gas supplied to the rotating shaft part in the bearing area and improving the support performance of the gas bearing.

[0088] In some implementations...

[0089] The third air intake groove 9 is a groove structure formed on the outer peripheral surface of the rotating shaft 1. One end of the third air intake groove 9 is spaced more than 0 from the other end of the axial direction of the bearing area 5, forming a gas inlet 107. The other end of the third air intake groove 9 extends to a position connected with the bearing area 5, forming a gas outlet 106, so that the gas in the third air intake groove 9 can reach the bearing area 5 and enter the gap between the gas bearing 2 and the rotating shaft 1.

[0090] This is a preferred structural form of the third air intake groove of the present invention, namely, a groove formed on the outer peripheral surface of the rotating shaft, and the gas inlet three of the third air intake groove is spaced at a certain distance from the bearing area to introduce gas from the middle of the rotating shaft or the motor cavity. The gas outlet three of the third air intake groove extends to connect with the bearing area to effectively receive the gas introduced from the middle of the rotating shaft or the motor cavity and guide it to the bearing area through the third air intake groove, so as to further enhance the gas support between the bearing and the rotating shaft and improve the bearing performance of the gas bearing.

[0091] In some implementations...

[0092] The third gas vent 9 has an arc-shaped groove structure. The gas inlet 3 107 and the gas outlet 3 106 are offset in the axial direction. The direction from the gas inlet 3 107 to the gas outlet 3 106 along the circumferential direction is the same as the rotation direction of the rotating shaft 1.

[0093] And / or, along the direction from the gas inlet 3 107 to the gas outlet 3 106, the flow cross-sectional area of ​​the third gas duct 9 gradually increases.

[0094] This is a further preferred structural form of the third air intake groove of the present invention. The gas inlet three and the gas outlet three are staggered in the axial direction, and the direction from the gas inlet three to the gas outlet three, that is, the extension direction of the third air intake groove (the circumferential direction), is consistent with the rotation direction of the rotating shaft. This can effectively utilize the centrifugal force generated by the rotation of the rotating shaft to effectively throw the gas in the third air intake groove to the gas outlet three, and then into the bearing area, thereby improving the air intake efficiency and the gas suction efficiency, increasing the gas suction volume, and improving the bearing capacity. The flow cross-sectional area of ​​the gas inlet three to the gas outlet three of the present invention gradually increases, which can reduce the resistance of the channel with the flow of air, and improve the air intake efficiency of the gas with the rotation of the rotating shaft, further increasing the gas suction volume at the gas bearing and further improving the bearing capacity.

[0095] In some implementations...

[0096] The third air intake groove 9 has a spiral groove structure, and the groove depth of the third air intake groove 9 is 0.01mm-0.05mm. This is the preferred structural form and preferred groove depth of the third air intake groove of the present invention. The spiral groove serves two purposes: firstly, to intake air, and secondly, to pressurize the gas. The preferred groove depth can improve the air intake effect without affecting the structural strength of the rotating shaft, thereby improving the bearing's support capacity.

[0097] In this invention, multiple spiral grooves are also designed in the axial direction of the rotating shaft, evenly distributed at the radial bearing position. These are the gas inlet 103 and gas outlet 104 of the second air intake groove 7, and the gas outlet 106 and gas inlet 107 of the third air intake groove 9. The spiral grooves are wider inward and narrower outward in the radial bearing direction, and deeper inward and shallower outward (the spiral grooves serve two purposes: to intake gas and to pressurize the gas; the wider inward and narrower outward design means that the flow area gradually increases along the flow direction, which can improve the intake efficiency). The depth of the second and third air intake grooves is preferably designed to be between 0.01mm and 0.05mm. The positions of the second gas inlet 103 and the first gas outlet 102 correspond one-to-one. The gas thrown out from the first air intake groove 6 is drawn into the second air intake groove 7, flows from the second gas inlet 103 into the second gas outlet 104, and after being intakeed and pressurized (by the spiral grooves) by the first air intake groove 6 and the second air intake groove 7, it enters the air gap between the rotating shaft and the radial bearing. On the other hand, air in the middle of the shaft or in the motor cavity flows from the gas inlet 3 107 through the third air duct 9 into the air gap between the shaft and the radial bearing through the gas outlet 3 106. The spiral groove structure of the shaft can realize efficient gas flow in the radial rotation system, reduce the temperature rise of the radial rotation system, and improve the stability of the radial rotation system.

[0098] The groove width and position of gas inlet 2 103, gas outlet 2 104, gas outlet 3 106, and gas inlet 3 107 can be designed independently, and the appropriate size and position layout can be selected according to the gas flow rate and flow efficiency in the motor cavity on both sides of the radial bearing. In addition, under high-speed and heavy-load conditions, the radial rotation system needs to draw in enough gas to support the shaft. The spiral groove structure of the shaft can increase the gas flow velocity in the motor cavity, increase the gas in the air gap of the shaft bearing, improve the bearing load capacity, and prevent the radial rotation system from malfunctioning or failing.

[0099] In some implementations...

[0100] There are multiple third air intake grooves 9, and the multiple third air intake grooves 9 are spaced apart along the circumferential direction on the outer circumferential surface of the rotating shaft 1; and / or,

[0101] The gas bearing 2 completely covers the bearing area 5, and the gas bearing 2 also covers the gas outlet 3 106.

[0102] The third air intake groove of the present invention is preferably a plurality of grooves spaced apart along the circumferential direction, which can enhance the gas supply to the bearing area in the circumferential direction, further improve the intake volume, and further improve the bearing capacity of the bearing; and the gas bearing of the present invention covers the bearing area while also covering the gas outlet three, which can effectively ensure that the airflow discharged from the gas outlet three can effectively enter the interior of the bearing area and enhance the gas support for the rotating shaft, and the force of the gas support is provided by the gas bearing.

[0103] In some implementations...

[0104] The height of the outer peripheral surface of the bearing area 5 is lower than the height of the gas guiding area 4 at the position where the second gas duct 7 is not opened, that is, the radial radius of the outer peripheral surface of the bearing area 5 is smaller than the radial radius of the gas guiding area 4 at the position where the second gas duct 7 is not opened; the height of the outer peripheral surface of the bearing area 5 is lower than the height of the gas guiding area 8 at the position where the third gas duct 9 is not opened, that is, the radial radius of the outer peripheral surface of the bearing area 5 is smaller than the radial radius of the gas guiding area 8 at the position where the third gas duct 9 is not opened; so as to form a groove in the bearing area.

[0105] The present invention also forms a groove structure in the bearing area by making the height of the outer peripheral surface of the bearing area lower than the height of the position where the second air vent is not opened in the first gas guiding area, and / or the height of the outer peripheral surface of the bearing area lower than the height of the position where the third air vent is not opened in the second gas guiding area, that is, the shaft has a shallow groove in the middle of the radial bearing position, which can facilitate the storage of high pressure gas in the bearing bearing area, reduce high pressure gas leakage, and improve the overall bearing performance of the radial rotation system.

[0106] In some implementations...

[0107] The radial radius of the outer periphery of the bearing area 5 is 0.02mm-0.1mm smaller than the radial radius of the gas guiding area 4 without the second air intake groove 7; the radial radius of the outer periphery of the bearing area 5 is smaller than the radial radius of the gas guiding area 8 without the third air intake groove 9.

[0108] 0.02mm-0.1mm.

[0109] This is the preferred dimension of the bearing area groove of the present invention (i.e., the dimension relative to the gas guiding area one and two recesses). The present invention has a groove (shallow groove) designed in the bearing area 5 at the middle position of the radial bearing position by the rotating shaft 1. The groove diameter is slightly lower than that on both sides of the groove by 0.02mm-0.1mm. This groove structure is conducive to the storage of high pressure gas in the bearing bearing area, reducing high pressure gas end leakage and improving the overall bearing performance of the radial rotation system (because the bearing area 5 is a high pressure area and the other sections are low pressure areas. If the bearing area 5 is not provided with a groove, the introduced gas will easily flow out from the low pressure areas on both sides, and will not play the role of gas guiding, forming end leakage). The present invention effectively suppresses end leakage and improves the bearing performance of the bearing.

[0110] In some implementations...

[0111] The gas bearing 2 further includes a flat foil 10 and a corrugated foil 11. The flat foil 10 includes a flat foil carrying section 202 and a flat foil fixing section 201. The corrugated foil 11 includes a corrugated foil flat section 303, a corrugated foil support section 302, and a corrugated foil fixing section 301. The flat foil carrying section 202 is disposed on the outer periphery of the rotating shaft 1. The corrugated foil flat section 303 is located on the outer periphery of the flat foil carrying section 202. The corrugated foil support section 302 is connected to the corrugated foil flat section 303 and protrudes toward the flat foil carrying section 202 to support the flat foil carrying section 202. The first air duct 6 and the second air duct 7 can introduce gas into the gap between the carrying area 5 and the flat foil carrying section 202.

[0112] This is a preferred structural form of the gas bearing of the present invention, in which the corrugated foil support section supports the flat foil support section, further supporting the rotating shaft. Gas introduced into the axial end face of the rotating shaft enters the gap between the bearing area and the flat foil support section, so as to form gas pressure through the gas bearing to support the rotating shaft.

[0113] The present invention also provides an electric motor comprising the aforementioned rotor assembly.

[0114] This invention proposes a radial rotation system, as shown in Figures 1-3. The radial rotation system structure consists of a rotating shaft 1, a flat foil 10, and a corrugated foil 11. The rotating shaft 1 and the flat foil 10 are positioned correspondingly, that is, the flat foil bearing section 202 is designed between gas inlet 2 103 and gas inlet 3 107. When the rotating shaft rotates at high speed, a wedge-shaped gap is formed between the rotating shaft 1 and the inner surface of the flat foil 10. The viscous gas enters the wedge-shaped gap and is compressed due to Bernoulli's principle, causing the gas film to generate high pressure at the small gas gap. When the pressure of the gas film is sufficient to balance the load on the rotating shaft, the rotating shaft and the bearing completely separate.

[0115] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A rotor assembly, characterized in that: include: A rotating shaft (1) and a gas bearing (2) are provided. The rotating shaft (1) includes an axial end face (3), a gas guiding area (4), and a bearing area (5). The bearing area (5) is located on the outer circumferential surface of the rotating shaft (1) and is used to connect with the gas bearing (2). The rotating shaft (1) is supported by the gas bearing (2). The gas guiding area (4) is located on the outer circumferential surface of the rotating shaft (1) and is connected with the axial end face (3). The bearing area (5) is connected with the gas guiding area (4). A first gas venting groove (6) is provided on the axial end face (3). A second gas venting groove (7) is provided on the gas guiding area (4). The first gas venting groove (6) can introduce external gas. One end of the second gas venting groove (7) is connected to the first gas venting groove (6), and the other end can guide the gas to the bearing area (5) and enter the gap between the rotating shaft (1) and the gas bearing (2). It also includes a second gas guiding area (8), the first gas guiding area (4) is connected to one axial end of the bearing area (5), the second gas guiding area (8) is located on the outer circumferential surface of the rotating shaft and is connected to the other axial end of the bearing area (5), the second gas guiding area (8) is provided with a third air vent (9), one end of the third air vent (9) can introduce air from the middle of the rotating shaft (1) or the motor cavity, and the other end can guide the gas to the bearing area (5) and enter the gap between the rotating shaft (1) and the gas bearing (2).

2. The rotor assembly according to claim 1, characterized in that: The first gas inlet groove (6) is a groove structure opened on the axial end face (3). One end of the first gas inlet groove (6) is spaced from the radial outer edge of the axial end face (3) by a preset distance greater than 0, forming a gas inlet (101). The other end of the first gas inlet groove (6) is located at the radial outer edge of the axial end face (3), forming a gas outlet (102). External gas can enter the first gas inlet groove (6) through the gas inlet (101), and the gas in the first gas inlet groove (6) can enter the second gas inlet groove (7) through the gas outlet (102).

3. The rotor assembly according to claim 2, characterized in that: The distance between the center position of the gas inlet (101) and the center position of the axial end face (3) is greater than 0; along the direction from the gas inlet (101) to the gas outlet (102), the flow cross-sectional area of ​​the first gas vent (6) gradually increases.

4. The rotor assembly according to claim 2, characterized in that: The first gas vent (6) has an arc-shaped groove structure. The gas inlet (101) and the gas outlet (102) are offset in the radial direction. The direction from the gas inlet (101) to the gas outlet (102) along the circumferential direction is the same as the rotation direction of the rotating shaft (1).

5. The rotor assembly according to claim 2, characterized in that: The second air intake groove (7) is a groove structure formed on the outer peripheral surface of the rotating shaft (1). One end of the second air intake groove (7) is located at the axial end of the outer peripheral surface of the rotating shaft (1) and forms a second gas inlet (103). The second gas inlet (103) is connected to and communicates with the first gas outlet (102). The other end of the second air intake groove (7) extends to the position connected to the bearing area (5) and forms a second gas outlet (104), so that the gas in the first air intake groove (6) can reach the bearing area (5) through the second air intake groove (7) and enter the gap between the gas bearing (2) and the rotating shaft (1).

6. The rotor assembly according to claim 5, characterized in that: The second gas vent (7) has an arc-shaped groove structure. The second gas inlet (103) and the second gas outlet (104) are offset in the axial direction. The direction from the second gas inlet (103) to the second gas outlet (104) along the circumferential direction is the same as the rotation direction of the rotating shaft (1). And / or, along the direction from the second gas inlet (103) to the second gas outlet (104), the flow cross-sectional area of ​​the second gas vent (7) gradually increases.

7. The rotor assembly according to claim 6, characterized in that: The first air intake groove (6) and the second air intake groove (7) are both spiral groove structures, and the groove depth of the first air intake groove (6) and the second air intake groove (7) is 0.01mm-0.05mm.

8. The rotor assembly according to claim 5, characterized in that: There are multiple first air intake grooves (6), which are spaced apart along the circumferential direction on the axial end face (3); there are multiple second air intake grooves (7), which are spaced apart along the circumferential direction on the outer circumferential surface of the rotating shaft (1); the second air intake grooves (7) correspond one-to-one with the first air intake grooves (6) and are connected; and / or, The gas bearing (2) completely covers the bearing area (5), and the gas bearing (2) also covers the gas outlet (104).

9. The rotor assembly according to claim 1, characterized in that: The third air intake groove (9) is a groove structure opened on the outer peripheral surface of the rotating shaft (1). One end of the third air intake groove (9) is spaced at a distance greater than 0 from the other end of the axial direction of the bearing area (5) to form a gas inlet three (107). The other end of the third air intake groove (9) extends to the position connected with the bearing area (5) to form a gas outlet three (106), so that the gas in the third air intake groove (9) can reach the bearing area (5) and enter the gap between the gas bearing (2) and the rotating shaft (1).

10. The rotor assembly according to claim 9, characterized in that: The third gas inlet groove (9) has an arc-shaped groove structure. The gas inlet three (107) and the gas outlet three (106) are offset in the axial direction. The direction from the gas inlet three (107) to the gas outlet three (106) along the circumferential direction is the same as the rotation direction of the rotating shaft (1). And / or, along the direction from the gas inlet three (107) to the gas outlet three (106), the flow cross-sectional area of ​​the third gas vent (9) gradually increases.

11. The rotor assembly according to claim 10, characterized in that: The third air intake groove (9) has a spiral groove structure, and the groove depth of the third air intake groove (9) is 0.01mm-0.05mm.

12. The rotor assembly according to claim 9, characterized in that: There are multiple third air intake grooves (9), and the multiple third air intake grooves (9) are spaced apart along the circumferential direction on the outer circumferential surface of the rotating shaft (1); and / or, The gas bearing (2) completely covers the bearing area (5), and the gas bearing (2) also covers the gas outlet three (106).

13. The rotor assembly according to claim 1, characterized in that: The height of the outer periphery of the bearing area (5) is lower than the height of the gas guiding area one (4) at the position where the second gas vent (7) is not opened, that is, the radial radius of the outer periphery of the bearing area (5) is smaller than the radial radius of the gas guiding area one (4) at the position where the second gas vent (7) is not opened; the height of the outer periphery of the bearing area (5) is lower than the height of the gas guiding area two (8) at the position where the third gas vent (9) is not opened, that is, the radial radius of the outer periphery of the bearing area (5) is smaller than the radial radius of the gas guiding area two (8) at the position where the third gas vent (9) is not opened; so as to form a groove in the bearing area.

14. The rotor assembly according to claim 13, characterized in that: The radial radius of the outer periphery of the bearing area (5) is 0.02mm-0.1mm smaller than the radial radius of the gas guiding area one (4) at the point where the second gas vent (7) is not opened; the radial radius of the outer periphery of the bearing area (5) is 0.02mm-0.1mm smaller than the radial radius of the gas guiding area two (8) at the point where the third gas vent (9) is not opened.

15. The rotor assembly according to claim 1, characterized in that: The gas bearing (2) further includes a flat foil (10) and a corrugated foil (11). The flat foil (10) includes a flat foil bearing section (202) and a flat foil fixing section (201). The corrugated foil (11) includes a corrugated foil flat section (303), a corrugated foil support section (302), and a corrugated foil fixing section (301). The flat foil bearing section (202) is disposed on the outer periphery of the rotating shaft (1). The corrugated foil flat section (303) is located on the outer periphery of the flat foil bearing section (202). The corrugated foil support section (302) is connected to the corrugated foil flat section (303) and protrudes toward the flat foil bearing section (202) to support the flat foil bearing section (202). The first air vent (6) and the second air vent (7) can introduce gas into the gap between the bearing area (5) and the flat foil bearing section (202).

16. An electric motor, characterized in that: The rotor assembly includes any one of claims 1-15.

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