Rotor, motor and turbomachinery

Abstract

The utility model provides a rotor, a motor and a turbomachinery, and the rotor comprises a magnetic part which comprises a first end and a second end; the rotating shaft comprises a first end shaft and a second end shaft, the first end shaft is connected with the first end, and the second end shaft is connected with the second end; and the sheath sleeves the magnetic piece, and the sheath and one of the first end shaft and the second end shaft are of an integrated structure and form a sheath shaft for protecting the magnetic piece. According to the rotor, the magnetic part and the first end shaft or the second end shaft are arranged into the integrated structure and form the sheath shaft, and during assembly, the sheath shaft is sleeved on the periphery of the magnetic part, so that the installation of the sheath and a certain end shaft is realized, and the arrangement of the sheath shaft simplifies the assembly process of the rotor and improves the assembly efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of engineering machinery, and in particular to a rotor, a motor and a turbine machinery. Background Art

[0002] With the development of modern turbine machinery, air bearings and electromagnetic bearings have been put into use, and turbine machinery has the prerequisite to reach high speed. In addition, users have higher requirements for efficiency. In order to meet user requirements, the motor design has too high speed and certain requirements for the overall volume. Usually, high-speed air compressors use gas suspension bearings, which have requirements for the outer diameter of the shaft. Utility Model Content

[0003] In view of this, the present application provides a rotor, wherein the rotor sleeve and one end of the rotating shaft are an integrated structure, which improves the assembly speed and reduces the outer diameter of the rotor. In addition, the present application also provides a motor including the above rotor, and a turbine machine including the above motor.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] A rotor comprising:

[0006] A magnetic member including a first end and a second end;

[0007] A rotating shaft, comprising a first end shaft and a second end shaft, wherein the first end shaft is connected to the first end, and the second end shaft is connected to the second end;

[0008] A sheath is provided to cover the magnetic component. The sheath is an integral structure with one of the first end shaft and the second end shaft, and forms a sheath shaft for protecting the magnetic component.

[0009] Optionally, in the above-mentioned rotor, the material of the sleeve shaft is an alloy, and the material grade of the alloy is GH4169.

[0010] Optionally, in the above rotor, the sleeve shaft is interference connected with the magnetic member.

[0011] Optionally, in the above-mentioned rotor, in the axial direction of the rotating shaft, the size of the sleeve shaft is A, the size of the rotor is B, and the size of the magnetic component is C, wherein AC≥0.5B.

[0012] A motor, comprising:

[0013] A housing having a receiving cavity;

[0014] A stator, arranged in the accommodating cavity;

[0015] A rotor, disposed in the accommodating cavity and located on the inner side of the stator, wherein the rotor is any one of the rotors described above;

[0016] The impeller is connected to the sleeve shaft of the rotor and can rotate synchronously with the sleeve shaft.

[0017] Optionally, in the above motor, in the projection plane orthogonal to the axial direction of the rotating shaft, the size of the magnetic component is D, and in the axial direction of the rotating shaft, the size of the magnetic component is E, wherein 15mm≤D≤16mm, 11mm≤E≤12mm.

[0018] Optionally, in the above motor, in a projection plane orthogonal to the axial direction of the rotating shaft, the outer diameter of the stator is F, and the inner diameter of the stator is G, wherein 46mm≤F≤50mm, and 23mm≤G≤27mm.

[0019] A turbomachinery comprises the motor described in any one of the above items.

[0020] The present application provides a rotor, which includes a magnetic part, a rotating shaft and a sleeve. In the axial direction of the magnetic part, the magnetic part has a first end and a second end. The rotating shaft includes a first end shaft and a second end shaft. The first end shaft is connected to the first end of the magnetic part, and the second end shaft is connected to the second end of the magnetic part. The sleeve is sleeved on the outer periphery of the magnetic part, and the sleeve and the first end shaft or the second end shaft are an integral structure. It should be noted that the sleeve and the first end shaft or the second end shaft are integrally formed to form a sleeve shaft. The sleeve shaft can be cast in a mold, and the sleeve shaft can both protect the magnetic part and transmit rotation. In the prior art, when assembling the rotor, the first end shaft and the second end shaft need to be assembled with the magnetic part respectively, and then the sleeve is sleeved on the outer periphery of the magnetic part to protect the magnetic part. In the present application, the magnetic part and the first end shaft or the second end shaft are arranged as an integral structure to form a sleeve shaft. During assembly, the sleeve shaft is sleeved on the outer periphery of the magnetic part, thus realizing the installation of the sleeve and a certain end shaft. It can be seen that the setting of the sleeve shaft simplifies the assembly process of the rotor and improves the assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of the structure of a motor provided in an embodiment of the present application;

[0023] Figure 2A schematic diagram of the structure of a rotor provided in an embodiment of the present application;

[0024] Figure 3 The first three modal vibration shapes and strain energy distribution diagram of the rotor provided in the embodiment of the present application;

[0025] Figure 4 The first-order modal vibration diagram provided in the embodiment of the present application;

[0026] Figure 5 A strain energy distribution diagram of the first-order mode provided in an embodiment of the present application;

[0027] Figure 6 The second-order modal vibration diagram provided in the embodiment of the present application;

[0028] Figure 7 A strain energy distribution diagram of the second-order mode provided in an embodiment of the present application;

[0029] Figure 8 The third-order modal vibration diagram provided in the embodiment of the present application;

[0030] Fig. 9 This is a strain energy distribution diagram of the third-order mode provided in an embodiment of the present application.

[0031] exist Figure 1-Figure 9 middle:

[0032] 1. Rotor; 2. Magnetic part; 3. Rotating shaft; 4. First end shaft; 5. Second end shaft; 6. Sleeve; 7. Sleeve shaft; 8. Casing; 9. Stator; 10. Impeller. DETAILED DESCRIPTION

[0033] The present application provides a rotor, wherein the rotor sleeve and one end of the rotating shaft are an integrated structure, which improves the assembly speed and reduces the outer diameter of the rotor. In addition, the present application also provides a motor including the above rotor, and a turbine machine including the above motor.

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] like Figure 1-Figure 9As shown, an embodiment of the present application provides a rotor 1, which includes a magnetic part 2, a rotating shaft 3 and a sleeve 6. In the axial direction of the magnetic part 2, the magnetic part 2 has a first end and a second end, the rotating shaft 3 includes a first end shaft 4 and a second end shaft 5, and the first end shaft 4 is connected to the first end of the magnetic part 2, and the second end shaft 5 is connected to the second end of the magnetic part 2. The sleeve 6 is sleeved on the outer periphery of the magnetic part 2, and the sleeve 6 and the first end shaft 4 or the second end shaft 5 are an integral structure. It should be noted that the sleeve 6 and the first end shaft 4 or the second end shaft 5 are integrally formed to form a sleeve shaft 7. The sleeve shaft 7 can be cast in a mold, and the sleeve shaft 7 can not only protect the magnetic part 2, but also transmit rotation. In the prior art, when assembling the rotor 1, the first end shaft 4 and the second end shaft 5 need to be assembled with the magnetic part 2 respectively, and then the sleeve 6 is sleeved on the outer periphery of the magnetic part 2 to protect the magnetic part 2. In the present application, the magnetic part 2 and the first end shaft 4 or the second end shaft 5 are arranged into an integral structure and form a sleeve shaft 7. During assembly, the sleeve shaft 7 is sleeved on the outer periphery of the magnetic part 2, thereby realizing the installation of the sleeve 6 and a certain end shaft. It can be seen that the setting of the sleeve shaft 7 simplifies the assembly process of the rotor 1 and improves the assembly efficiency.

[0036] In one example, the magnetic member 2 is a solid magnet.

[0037] Furthermore, the material of the sheath shaft 7 is an alloy, and the material grade of the alloy is GH4169. GH4169 is a high-temperature alloy material, which is a nickel-based alloy with excellent high-temperature strength, corrosion resistance, oxidation resistance and mechanical properties. As the material of the sheath shaft 7, it can ensure that the rotor 1 maintains stable performance in a high-temperature, corrosive and high-stress environment, prolong the service life of the sheath shaft 7 and improve its reliability.

[0038] In other optional embodiments, the material of the sleeve shaft 7 may also be but not limited to stainless steel, copper alloy, etc. That is to say, the material of the sleeve shaft 7 needs to comprehensively consider factors such as the working environment, mechanical performance requirements and cost, but it is necessary to be based on the premise that the sleeve shaft 7 can protect the magnetic part 2 and can transmit rotation.

[0039] In some optional embodiments, the sleeve shaft 7 is connected with the magnetic member 2 by interference fit. That is, the inner diameter of the sleeve shaft 7 is slightly smaller than the outer diameter of the magnetic member 2, and the sleeve shaft 7 is tightly connected with the magnetic member 2 by using external force, thereby improving the strength and bearing capacity of the connection between the sleeve shaft 7 and the magnetic member 2 and simplifying the assembly process.

[0040] In some other optional embodiments, the sleeve shaft 7 and the magnetic component 2 may also be connected by mechanical connection elements such as threads, pins, and pin shafts to fix the magnetic component 2 on the sleeve 6.

[0041] In some optional embodiments, in the axial direction of the magnetic part 2, the size of the sleeve shaft 7 is A, the total size of the rotor 1 is B, and the size of the magnetic part 2 is C, wherein AC≥0.5B. The sleeve shaft 7 includes a first sleeve section on which the magnetic part 2 is sleeved, and a second sleeve section connected to the first sleeve section. The length of the first sleeve section is slightly greater than the length of the magnetic part 2, so as to strengthen the connection between the sleeve shaft 7 and the magnetic part 2. It should be noted that the length of the first sleeve section may also be the same as the length of the magnetic part 2. In addition to protecting the magnetic part 2, the sleeve shaft 7 can also transmit rotation. Therefore, the second sleeve section of the sleeve shaft 7 has a certain length, so as to drive other accessories to rotate. For example, when the rotor 1 is installed in the motor, the second sleeve section of the sleeve shaft 7 can drive the impeller 10 at the end of the motor to rotate.

[0042] In addition, the present application also provides a motor, which includes a housing 8, a stator 9, a rotor 1 and an impeller 10. The housing 8 has a accommodating cavity, the stator 9 is arranged in the accommodating cavity, the rotor 1 is arranged in the accommodating cavity and is located on the inner side of the stator 9, the impeller 10 is connected to the sleeve shaft 7 of the rotor 1 and can rotate synchronously with the sleeve shaft 7, wherein the rotor 1 is the above-mentioned rotor 1, and the beneficial effects of the motor brought by the above-mentioned rotor 1, please refer to the above-mentioned description of the rotor 1, which will not be repeated here.

[0043] Furthermore, in the projection plane orthogonal to the axial direction of the rotating shaft 3, the size of the magnetic part 2 is C, and in the axial direction of the rotating shaft 3, the size of the magnetic part 2 is D, wherein 15mm≤C≤16mm, 11mm≤D≤12mm. The rotor 1 is disposed inside the motor, and the outer diameter of the magnetic part 2 ranges from 15mm to 16mm. In a certain example, the outer diameter of the magnetic part 2 is 15.5mm; the length of the magnetic part 2 ranges from 11mm to 12mm. In a certain example, the length of the magnetic part 2 is 11.6mm.

[0044] In some optional embodiments, in the projection plane orthogonal to the axial direction of the rotating shaft 3, the outer diameter of the stator 9 is E, where 46mm≤E≤50mm, and the inner diameter of the stator 9 is F, where 23mm≤F≤27mm. In a certain example, the outer diameter of the stator 9 is 48mm and the inner diameter is 25mm. It should be noted that the length of the motor is 105mm and the outer diameter of the motor is 58.9mm. It can be seen that the overall size of the motor is small and suitable for various turbine machines, and the smaller motor size is more suitable for turbine machines with higher speeds. The power of the above motor meets 100w and the speed meets 100000rpm.

[0045] Taking the air compressor of a certain project as an example, the general situation of the unit is as follows: 100000rpm speed, power is 200w. At this speed, it is guaranteed that the shaft 3 can operate normally. The extraction of modal calculation results is based on two criteria:

[0046] First, since the rotor 1 is symmetrical in the radial direction, when extracting the mode, the dynamic characteristics of the rotor 1 can be characterized by considering one radial direction, and the mode in the other symmetrical direction can be ignored.

[0047] Second: modal extraction generally considers the positive precession mode. During the startup process of rotor 1, a single excitation frequency is considered, that is, there is a certain imbalance, and the excitation frequency is the rotation frequency fn. Other conditions such as rotor-stator friction and the influence of aerodynamic cross-coupling stiffness are not considered.

[0048] Depend on Figure 3-Figure 9 It can be seen that the first-order critical speed is 59500rpm, the natural frequency of the system is 991.66Hz, the vibration mode is cone pendulum vibration mode, the first-order mode, the strain energy on the shaft 3 is 1.37%, and the strain energy on the bearing is 98.63%; the second-order critical speed is 69829pm, the natural frequency of the system is 1163.81Hz, the vibration mode is translation vibration mode, the second-order mode, the strain energy on the shaft 3 is 0.4%, and the strain energy on the bearing is 99.60%; the third-order critical speed is 448155rpm, the natural frequency of the system is 7469.25Hz, the vibration mode is the right shaft bending vibration mode, the third-order mode, the strain energy on the shaft 3 is 99.15%, and the strain energy on the bearing is 0.85%. It should be noted that in Figure 3-Figure 6 , potential energy distribution (s / w=1).

[0049] Therefore, it can be seen from the Campbell diagram and the modal vibration shape that the rotor 1 of this embodiment operates normally at a speed of 100,000 rpm without resonance, and has a safety margin, meeting the long-term operation requirements.

[0050] Through the above calculations, it can be determined that the magnet structure used for the inner rotor 1 is effective, meets the operating conditions, and can meet the following advantages: the rotation of the shaft 3 at a high speed not only ensures the motor performance, but also ensures that the size of the outer diameter of the shaft 3 is controlled to a certain small degree, and the outer diameter of the rotor 1 is reduced as much as possible, which is convenient for the application of gas suspension bearings. In addition, the reduction in the outer diameter of the rotor 1 can ensure the reduction in the volume of the whole machine and the reduction in parts, which is convenient for the development of micro high-speed motors.

[0051] In addition, the present application also provides a turbine machine. For the beneficial effects of the turbine machine brought about by the above-mentioned motor, please refer to the above-mentioned description of the motor and will not be repeated here.

[0052] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0053] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0054] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0055] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0056] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0057] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A rotor, characterized in that: include: A magnetic member including a first end and a second end; A rotating shaft, comprising a first end shaft and a second end shaft, wherein the first end shaft is connected to the first end, and the second end shaft is connected to the second end; A sheath is provided to cover the magnetic component. The sheath is an integral structure with one of the first end shaft and the second end shaft, and forms a sheath shaft for protecting the magnetic component.

2. The rotor according to claim 1, characterized in that The sleeve shaft is made of alloy, and the material grade of the alloy is GH4169.

3. The rotor according to claim 1, characterized in that The sleeve shaft is interference connected with the magnetic member.

4. The rotor according to claim 1, characterized in that In the axial direction of the rotating shaft, the size of the sleeve shaft is A, the size of the rotor is B, and the size of the magnetic component is C, wherein AC≥0.5B.

5. A motor, characterized in that: include: A housing having a receiving cavity; A stator, arranged in the accommodating cavity; A rotor, arranged in the accommodating cavity and located on the inner side of the stator, wherein the rotor is the rotor according to any one of claims 1 to 4 above; The impeller is connected to the sleeve shaft of the rotor and can rotate synchronously with the sleeve shaft.

6. The motor according to claim 5, characterized in that In the projection plane orthogonal to the axial direction of the rotating shaft, the size of the magnetic component is D, and in the axial direction of the rotating shaft, the size of the magnetic component is E, wherein 15 mm ≤ D ≤ 16 mm, and 11 mm ≤ E ≤ 12 mm.

7. The motor according to claim 6, characterized in that In a projection plane orthogonal to the axial direction of the rotating shaft, the outer diameter of the stator is F, and the inner diameter of the stator is G, wherein 46 mm ≤ F ≤ 50 mm, and 23 mm ≤ G ≤ 27 mm.

8. A turbomachinery, characterized in that: A motor comprising any one of claims 5 to 7.

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