Compressor rotor assembly and control method thereof, compressor and air conditioning equipment

Abstract

The present disclosure relates to a compressor rotor assembly and a control method thereof, a compressor, and an air-conditioning device. The compressor rotor assembly includes: a bearing, which is a static pressure gas bearing and is provided with at least two radial air supply holes; a rotor, which is installed in the bearing; and at least two pressure supply components, which are respectively connected to the at least two radial air supply holes; wherein the air supply pressures of the at least two pressure supply components are different. In the initial stage of the rotor rotation, the at least two pressure supply components ventilate the at least two radial air supply holes respectively, which can realize the eccentric suspension of the rotor relative to the bearing, increase the speed threshold for the occurrence of vortex, so that the operating speed of the rotor is further away from the vortex speed, effectively suppress the vortex instability of the static pressure gas bearing, and improve the motion stability.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air compression equipment, and in particular to a compressor rotor assembly and a control method thereof, a compressor, and air-conditioning equipment. Background Art

[0002] Bearings are essential components that support rotating parts in rotating machinery. Common types include rolling bearings, plain bearings, and magnetic bearings. Due to the complex control systems of magnetic bearings, rolling and plain bearings, due to oil lubrication, inevitably rub against rotating parts, leading to energy loss. This has led to the development of a new gas bearing technology.

[0003] A gas bearing creates a pressured air film in the gap between the bearing and the guide surface, thereby levitating the moving parts. Based on their principle, they can be categorized as either static or dynamic gas bearings. Dynamic gas bearings utilize the wedge angle created by the relative motion between the bearing and the moving part to generate a pressured air film, thereby supporting the moving parts. Static gas bearings, on the other hand, utilize external gas introduced into the small gap (0.02-0.04mm) between the bearing and the guide surface to generate a pressured air film, thereby supporting the moving parts. Due to the low friction coefficient of gas, static gas bearings are virtually frictionless and low-loss bearings.

[0004] At present, the more common throttling technologies used in air static pressure gas bearings include single-hole throttling type, multi-hole throttling type, micro-groove throttling type, micropore throttling type, and porous material throttling type. The working principle of the gas bearing is relatively complicated. When no external driving force is provided to the rotor, and only an external gas source is provided, the bearing supply gas enters the small holes (micropores, porous holes) of the static pressure gas bearing through the air inlet hole, and finally forms a pressure gas film in the gap between the rotor and the bearing to support the external load. Under this working condition, the bearing is equivalent to a pure static pressure gas bearing; when no external air pressure is provided, and only an external driving force is provided to the rotor, due to the dynamic pressure effect of the fluid, the lubricating gas is brought into the wedge-shaped gap and forms a lubricating gas film to bear the external load. At this time, the bearing is equivalent to a pure dynamic pressure gas bearing; when an external gas source and an external force to drive the rotor to rotate are provided at the same time, if the speed is high, the dynamic pressure effect generated by the rotor rotation cannot be ignored.

[0005] When operating at high speeds, static gas bearings can experience vortex instability in their moving parts. This dynamic instability can cause the bearing to malfunction at high speeds, increasing the vibration amplitude of the rotating parts, wearing the bearings, and damaging their performance. This further increases the vibration amplitude of the rotating parts, affecting machine performance and, in severe cases, causing safety accidents. Therefore, it is crucial to effectively suppress vortex instability in static gas bearings. Summary of the Invention

[0006] The inventors have discovered that in the related art, when the static pressure gas bearing is working at high speed, the moving parts will often experience vortex instability, causing the gas bearing to malfunction at high speed and affecting the working performance of the machine.

[0007] In view of this, the embodiments of the present disclosure provide a compressor rotor assembly and a control method thereof, a compressor and an air-conditioning device, which can cause a certain eccentricity of the rotor relative to the bearing, increase the speed of vortex generation, and improve the motion stability of the rotor assembly.

[0008] In one aspect of the present disclosure, there is provided a compressor rotor assembly comprising:

[0009] The bearing is a static pressure gas bearing and is provided with at least two radial air supply holes;

[0010] a rotor mounted in the bearing; and

[0011] at least two pressure supply components, respectively connected to the at least two radial air supply holes;

[0012] The air supply pressures of the at least two pressure supply components are configured to cause the rotor to be eccentrically suspended relative to the bearing.

[0013] In some embodiments, the gas supply pressures of at least two pressure supply components are different.

[0014] In some embodiments, the gas supply pressures of at least two pressure supply components are adjustable.

[0015] In some embodiments, at least two radial air supply holes are arranged at equal intervals in the circumferential direction of the bearing.

[0016] In some embodiments, the at least two radial air supply holes are an even number and are arranged opposite to each other in the radial direction of the bearing.

[0017] In some embodiments, the at least two radial air supply holes include a first radial air supply hole and a second radial air supply hole that are arranged opposite to each other in a vertical direction and are located at the top and bottom of the bearing respectively.

[0018] In some embodiments, the at least two pressure supply components include a first pressure supply component and a second pressure supply component respectively connected to the first radial air supply hole and the second radial air supply hole, and the sum of the air supply pressure of the first pressure supply component and the gravity of the rotor is greater than or less than the air supply pressure of the second pressure supply component.

[0019] In some embodiments, the bearing is provided with at least two tangential air supply holes tangential to the inner circumference of the bearing, and the air supply direction of the at least two tangential air supply holes is opposite to the rotation direction of the rotor.

[0020] In some embodiments, the at least two tangential air supply holes are evenly arranged in the circumferential direction of the bearing.

[0021] In some embodiments, the at least two tangential air supply holes are four tangential air supply holes, which are respectively arranged at the upper end, the lower end, the left end and the right end of the inner circumference of the bearing.

[0022] In some embodiments, further comprising:

[0023] Elastic bearing support; first radial protrusions are provided on both axial sides of the outer peripheral surface, and a second radial protrusion is provided in the axial middle portion of the outer peripheral surface;

[0024] The bearing is installed in the elastic bearing support, the protrusion height of the first radial protrusion is greater than the protrusion height of the second radial protrusion, and a groove is formed between the first radial protrusion and the second radial protrusion.

[0025] In one aspect of the present disclosure, a method for controlling the aforementioned compressor rotor assembly is provided, comprising:

[0026] Ventilation step: at the initial stage of the rotor rotation, ventilate the at least two radial air supply holes through at least two pressure supply components respectively, so that the rotor is eccentrically suspended relative to the bearing.

[0027] In some embodiments, the air supply pressures of at least two pressure supply components are adjustable, and the ventilation step further comprises:

[0028] Adjustment step: adjust the air supply pressure of at least two pressure supply components until the rotor is in an eccentric suspension state relative to the bearing.

[0029] In one aspect of the present disclosure, a compressor is provided, comprising the aforementioned compressor rotor assembly.

[0030] In one aspect of the present disclosure, an air-conditioning device is provided, comprising the aforementioned compressor.

[0031] Therefore, according to the embodiment of the present disclosure, at least two pressure supply components are provided, which are respectively connected to at least two radial air supply holes. Before the rotor rotates, at least two pressure supply components ventilate the at least two radial air supply holes respectively, which can realize eccentric suspension of the rotor relative to the bearing, increase the speed threshold for the occurrence of vortex, and thus make the operating speed of the rotor further away from the vortex speed, effectively suppress the vortex instability of the static pressure gas bearing, and improve the motion stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0033] The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0034] Figure 1 is a cross-sectional view of some embodiments of a compressor rotor assembly according to the present disclosure;

[0035] Figure 2 is a longitudinal cross-sectional view of some embodiments of a compressor rotor assembly according to the present disclosure;

[0036] Figure 3 is a cross-sectional view of a bearing in some embodiments of a compressor rotor assembly according to the present disclosure;

[0037] Figure 4 is a longitudinal cross-sectional view of an elastic bearing support in some embodiments of a compressor rotor assembly according to the present disclosure.

[0038] Description of Reference Numerals

[0039] 1. Elastic bearing support; 2. Bearing; 3. Rotor; 4. Pressure supply component; 4-1. First pressure supply component; 4-2. Second pressure supply component;

[0040] 11. Tangential air supply hole of the support; 12. Radial air supply hole of the support; 13. First radial protrusion; 14. Second radial protrusion; 15. Groove; 21. Tangential air supply hole; 22. Radial air supply hole; 22-1. First radial air supply hole; 22-2. Second radial air supply hole; 23. Throttle nozzle. DETAILED DESCRIPTION

[0041] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure, its application, or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions, and numerical values set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0042] The terms "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The terms "include" or "comprises" and similar terms mean that the elements before the term include the elements listed after the term, and do not exclude the possibility of also including other elements. The terms "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] In the present disclosure, when a specific device is described as being located between a first device and a second device, an intervening device may or may not be present between the specific device and the first device or the second device. When a specific device is described as being connected to another device, the specific device may be directly connected to the other device without an intervening device, or may be not directly connected to the other device but with an intervening device.

[0044] All terms (including technical or scientific terms) used in this disclosure have the same meaning as those understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined herein.

[0045] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0046] Figure 1 1 is a cross-sectional view of some embodiments of a compressor rotor assembly according to the present disclosure. Figure 1 As shown, the compressor rotor assembly of this embodiment includes: an elastic bearing support 1, a bearing 2, a rotor 3 and at least two pressure supply components 4, wherein the elastic bearing support 1 is used to install and position the bearing 2, and the bearing 2 is installed in the elastic bearing support 1; the bearing 2 is a static pressure gas bearing, used to support the rotor 3, and is provided with at least two radial air supply holes 22; the rotor 3 is installed in the bearing 2; the at least two pressure supply components 4 are respectively connected to the at least two radial air supply holes 22, for realizing ventilation into the bearing 2 cavity, so as to form a pressure air film in the gap between the rotor 3 and the bearing 2 to support the rotor 3; the air supply pressure of the at least two pressure supply components 4 is configured to make the rotor 3 eccentrically suspended relative to the bearing 2.

[0047] Before the rotor 3 rotates, at least two pressure supply components 4 supply air to at least two radial air supply holes 22, so that the rotor 3 can generate the following relative to the bearing 2: Figure 1 The eccentricity shown increases the speed threshold for the occurrence of vortex, so that the operating speed of the rotor 3 is further away from the vortex speed, effectively suppressing the vortex energy of the rotor 3 at high speed, improving the movement stability of the rotor 3 at high speed, and improving the reliability of the compressor rotor assembly.

[0048] The radial air supply hole 22 refers to a hole whose opening direction points to the center of the bearing 2; and before the rotor 3 rotates refers to a preparation stage before the rotor starts to rotate.

[0049] In some embodiments, the air supply pressures of at least two pressure supply components 4 are different. Configuring the air supply pressures of at least two pressure supply components 4 in different configurations can quickly achieve an eccentric suspension of the rotor 3 relative to the bearing 2, facilitating implementation. In some embodiments, the air supply pressures of at least two pressure supply components 4 are adjustable. This allows technicians to adjust the air supply pressure in real time, even before the rotor 3 becomes eccentric relative to the bearing 2, until eccentricity occurs, providing a quick and convenient solution.

[0050] In some embodiments, at least two radial air supply holes 22 are arranged at equal intervals around the circumference of the bearing 2. The at least two radial air supply holes 22 arranged at equal intervals around the circumference facilitate the generation of an air film acting on the rotor 3 from different circumferential positions, making it easier to manipulate the rotor 3 to produce an eccentricity relative to the bearing 2. In some embodiments, the at least two radial air supply holes 22 are an even number and are arranged in pairs opposite each other in the radial direction of the bearing 2. In this structural embodiment, the pressure supply component 4 vents the pairwise opposite radial air supply holes 22, making it easier to manipulate the position of the rotor 3.

[0051] In some embodiments, the number of the at least two radial air supply holes 22 is three or four or more. Figure 1 and Figure 2 As shown, in some embodiments, there are two radial air supply holes 22, and the at least two radial air supply holes 22 include a first radial air supply hole 22-1 and a second radial air supply hole 22-2 that are arranged in a vertically opposed manner and located at the top and bottom of the bearing 2, respectively. In these embodiments, the first radial air supply hole 22-1 and the second radial air supply hole 22-2 are arranged in a vertically opposed manner, so that a pressure difference is generated between the upper and lower surfaces of the rotor 3, thereby enabling the position of the rotor 3 to be manipulated to produce vertical eccentricity. Compared to embodiments in which multiple radial air supply holes 22 are provided, the structure is the simplest, is easy to manufacture, and has good feasibility.

[0052] like Figure 1 and Figure 2 As shown, in some embodiments, at least two pressure supply components 4 include a first pressure supply component 4-1 and a second pressure supply component 4-2 that are respectively connected to the first radial air supply hole 22-1 and the second radial air supply hole 22-2. The sum of the air supply pressure of the first pressure supply component 4-1 and the gravity of the rotor 3 is greater than or less than the air supply pressure of the second pressure supply component 4-2. When the sum of the air supply pressure of the first pressure supply component 4-1 and the gravity of the rotor 3 is greater than the air supply pressure of the second pressure supply component 4-2, the rotor 3 generates the following relative to the bearing 2: Figure 1 and Figure 2When the sum of the air pressure of the first pressure supply component 4-1 and the weight of the rotor 3 is less than the air pressure of the second pressure supply component 4-2, the rotor 3 becomes upwardly eccentric relative to the bearing 2. The rotor 3 is suspended with downward or upward eccentricity relative to the bearing 2, which is highly feasible and increases the speed threshold for the occurrence of vortex motion. The rotor 3 has good motion stability at high speeds.

[0053] like Figure 1 and Figure 3 As shown, in some embodiments, the bearing 2 is provided with at least two tangential air supply holes 21 tangential to the inner circumference of the bearing 2, and the air supply direction of the at least two tangential air supply holes 21 is opposite to the rotation direction of the rotor 3. In this way, the circumferential circulation of the gas can be effectively eliminated, thereby suppressing or eliminating the vortex. In some other embodiments, the at least two tangential air supply holes 21 are evenly arranged in the circumference of the bearing 2, which has a better effect of eliminating the circumferential circulation of the gas. In some embodiments, the at least two tangential air supply holes 21 are two or more, such as Figure 1 and Figure 3 As shown, in some embodiments, at least two tangential air supply holes 21, or four tangential air supply holes 21, are respectively provided at the upper end, lower end, left end, and right end of the inner circumference of the bearing 2. Experimental results show that this structure significantly eliminates circumferential gas circulation, is easy to manufacture, and has good feasibility.

[0054] Combine Figures 1 to 4 As shown, in some embodiments, the elastic bearing support 1 is provided with a support tangential air supply hole 11 and a support radial air supply hole 12, the support tangential air supply hole 11 is communicated with the tangential air supply hole 21, the bearing 2 is provided with a throttling nozzle 23, the support radial air supply hole 12 is communicated with the throttling nozzle 23 through the radial air supply hole 22, and the throttling nozzle 23 can pressurize the gas to a certain extent, thereby reducing the gas consumption during pressurization.

[0055] In some embodiments, as Figure 4 As shown, a first radial protrusion 13 is provided on both axial sides of the outer circumference of the elastic bearing support 1, and a second radial protrusion 14 is provided in the axial middle part of the outer circumference; the protrusion height of the first radial protrusion 13 is greater than the protrusion height of the second radial protrusion 14, and a groove 15 is formed between the first radial protrusion 13 and the second radial protrusion 14.

[0056] The elastic bearing support 1 is an elastic rubber block structure, so it has a certain vibration absorption and shock absorption capability. This structural design can reduce the mating surface between the elastic bearing support 1 and other parts, thereby reducing the difficulty of assembly, and the first radial protrusion 13 can provide a first shock absorption effect. When the vibration of the rotor 3 increases during high-speed rotation, the first radial protrusion 13 is flattened and is not enough to absorb and absorb vibration. The second radial protrusion 14 can provide a second shock absorption effect, thereby greatly improving the shock absorption capability of the bearing and improving its operating stability. The main purpose of designing the groove 15 is to provide a certain space for the deformation of the first radial protrusion 13 and the second radial protrusion 14.

[0057] Accordingly, the present disclosure further provides a method for controlling the compressor rotor assembly in the above embodiment, comprising:

[0058] Ventilation step: At the initial stage of rotation of the rotor 3 , air is ventilated to the at least two radial air supply holes 22 through the at least two pressure supply components 4 , so that the rotor 3 is eccentrically suspended relative to the bearing 2 .

[0059] In the embodiment of the method, at the initial stage of the rotation of the rotor 3, different air supply pressures are applied to the at least two radial air supply holes 22 by at least two pressure supply components 4, and the rotor 3 generates the following relative to the bearing 2: Figure 1 The eccentricity shown increases the speed threshold for the occurrence of vortex, so that the operating speed of the rotor 3 is further away from the vortex speed, effectively suppressing the vortex energy of the rotor 3 at high speed, improving the movement stability of the rotor 3 at high speed, and improving the reliability of the compressor rotor assembly.

[0060] The radial air supply hole 22 refers to a hole whose opening direction points to the center of the bearing 2; and before the rotor 3 rotates refers to a preparation stage before the rotor starts to rotate.

[0061] In some embodiments, the air supply pressures of at least two pressure supply components 4 are adjustable, and the ventilation step further comprises:

[0062] Adjustment step: adjust the air supply pressure of at least two pressure supply components 4 until the rotor 3 is in an eccentrically suspended state relative to the bearing 2.

[0063] By using the method of this embodiment, technicians can adjust the air supply pressure in real time before the rotor 3 is eccentric relative to the bearing 2 until eccentricity occurs, which is convenient and quick.

[0064] The various embodiments of the compressor rotor assembly disclosed above can be applied to a compressor or an air conditioning device. Accordingly, the present disclosure provides a compressor comprising any of the aforementioned compressor rotor assembly embodiments. Accordingly, the present disclosure provides an air conditioning device comprising the aforementioned compressor.

[0065] Thus far, various embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0066] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A compressor rotor assembly, comprising: The bearing (2) is a static pressure gas bearing and is provided with at least two radial air supply holes (22); a rotor (3) mounted in the bearing (2); and At least two pressure supply components (4) are respectively connected to the at least two radial air supply holes (22); the air supply pressures of the at least two pressure supply components (4) are different; the air supply pressures of the at least two pressure supply components (4) are adjustable; the at least two radial air supply holes (22) are an even number and are arranged opposite to each other in the radial direction of the bearing (2); the at least two radial air supply holes (22) include a first radial air supply hole (22-1) and a second radial air supply hole (22-2) which are arranged opposite to each other in the vertical direction and are respectively located at the top and bottom of the bearing (2); The air supply pressures of the at least two pressure supply components (4) are configured to cause the rotor (3) to be eccentrically suspended relative to the bearing (2).

2. The compressor rotor assembly according to claim 1, wherein: The at least two radial air supply holes (22) are arranged at equal intervals in the circumferential direction of the bearing (2).

3. The compressor rotor assembly according to claim 1, wherein: The at least two pressure supply components (4) include a first pressure supply component (4-1) and a second pressure supply component (4-2) respectively connected to the first radial air supply hole (22-1) and the second radial air supply hole (22-2), and the sum of the air supply pressure of the first pressure supply component (4-1) and the gravity of the rotor (3) is greater than or less than the air supply pressure of the second pressure supply component (4-2).

4. The compressor rotor assembly according to claim 1, wherein: The bearing (2) is provided with at least two tangential air supply holes (21) tangential to the inner circumferential surface of the bearing (2), and the air supply direction of the at least two tangential air supply holes (21) is opposite to the rotation direction of the rotor (3).

5. The compressor rotor assembly according to claim 4, wherein: The at least two tangential air supply holes (21) are evenly arranged in the circumferential direction of the bearing (2).

6. The compressor rotor assembly according to claim 5, wherein: The at least two tangential air supply holes (21) are four tangential air supply holes (21), which are respectively arranged at the upper end, the lower end, the left end and the right end of the inner circumferential surface of the bearing (2).

7. The compressor rotor assembly of claim 1 , further comprising: An elastic bearing support (1); first radial projections (13) are provided on both axial sides of the outer peripheral surface, and a second radial projection (14) is provided in the axial middle portion of the outer peripheral surface; The bearing (2) is mounted in the elastic bearing support (1), the protrusion height of the first radial protrusion (13) is greater than the protrusion height of the second radial protrusion (14), and a groove (15) is formed between the first radial protrusion (13) and the second radial protrusion (14).

8. A method for controlling a compressor rotor assembly according to claim 1, comprising: Ventilation step: before the rotor (3) rotates, ventilate the at least two radial air supply holes (22) through the at least two pressure supply components (4) respectively, so that the rotor (3) is eccentrically suspended relative to the bearing (2).

9. The control method according to claim 8, wherein: The air supply pressures of the at least two pressure supply components (4) are adjustable, and the ventilation step further comprises: Adjustment step: adjusting the air supply pressure of the at least two pressure supply components (4) until the rotor (3) is in an eccentrically suspended state relative to the bearing (2).

10. A compressor comprising the compressor rotor assembly according to any one of claims 1 to 7.

11. An air conditioning device comprising the compressor according to claim 10.

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