CN210509968U - Magnetic suspension bearing system and tool with same - Google Patents

Abstract

The utility model provides a magnetic suspension bearing system and have its frock. The magnetic bearing system comprises: a main shaft; the thrust bearing is sleeved on the main shaft; the first axial iron core assembly is sleeved on the main shaft and is positioned on the first side of the thrust bearing; the second axial iron core assembly is sleeved on the main shaft and is positioned on the second side of the thrust bearing; a detection assembly integrated on the first axial core assembly or on the second axial core assembly. The utility model provides a magnetic suspension bearing system can improve owing to integrate the determine module on first axial iron core subassembly or second axial iron core subassembly the utility model provides a magnetic suspension bearing system's control accuracy to can reduce the length of main shaft, and then can improve the mechanical properties and the quality of main shaft.

Description

Magnetic suspension bearing system and tool with same

Technical Field

The utility model relates to a bearing technical field particularly, relates to a magnetic suspension bearing system and have its frock.

Background

The magnetic suspension bearing has the characteristics of no mechanical contact, no need of lubrication, high critical rotating speed, long service life, high reliability and the like, and is widely applied to the fields of high speed and ultrahigh speed. The sensor is an indispensable part of a magnetic suspension system, the detection precision of the sensor is very important, the position detection precision of the magnetic suspension system is improved, and the overall performance and the service life of the system can be improved.

Referring to fig. 1, the existing magnetic suspension bearing system adopts a sensing-actuating separation mode, and its basic structure includes an optical axis 1, a radial displacement sensor 2, a radial bearing 3, a motor rotor 4, an axial bearing iron core 5, an axial bearing coil 6, a rotor thrust disc 7 and an axial displacement sensor 8.

The axial bearing stators are arranged on two sides of the rotor thrust disc 7, the radial displacement sensor 2 for detecting the radial displacement of the rotor is arranged on one side of the radial bearing 3, the axial displacement sensor 8 for detecting the axial displacement of the rotor is arranged on the left end face of the optical axis 1, and the axial displacement sensor 8 and the bearing are separately installed. When the optical axis 1 is displaced radially or axially, the axial displacement sensor 8 converts the detected displacement change into a signal and transmits the signal to the system, and then the output of the axial bearing is controlled to enable the shaft to return to a safe position.

This structure has the following disadvantages:

1. the detection value of the axial displacement sensor is possibly inconsistent with the actual axial clearance data of the thrust bearing, and the control precision of the system is influenced;

2. the sensors and the axial bearings are arranged separately, so that the number of outlet terminals of the whole system is large;

3. the radial displacement sensor needs to occupy a certain axial space of the main shaft, so that the length of the main shaft is increased, the dynamic performance of the main shaft is reduced, and the cost of the whole system is increased.

SUMMERY OF THE UTILITY MODEL

A primary object of the utility model is to provide a magnetic suspension bearing system and have its frock to solve the magnetic suspension bearing system among the prior art and have its not high enough problem of frock control accuracy.

In order to achieve the above object, according to one aspect of the present invention, there is provided a magnetic suspension bearing system comprising: a main shaft; the thrust bearing is sleeved on the main shaft; the first axial iron core assembly is sleeved on the main shaft and is positioned on the first side of the thrust bearing; the second axial iron core assembly is sleeved on the main shaft and is positioned on the second side of the thrust bearing; a detection assembly integrated on the first axial core assembly or on the second axial core assembly.

Further, the detection assembly includes: an annular housing having a through hole in the center thereof; and the radial displacement sensor is arranged on the inner side wall surface of the through hole.

Further, the detection assembly further comprises: an axial displacement sensor disposed on an end face of the annular housing.

Further, the integrated setting of detection subassembly is in second axial iron core subassembly is kept away from one side of footstep bearing, the fixed axial displacement that is provided with on the main shaft detects the ring, axial displacement detects the ring and is close to second axial iron core subassembly sets up.

Furthermore, the magnetic suspension bearing system also comprises a sensor wire outlet circuit board and a bearing wire outlet circuit board, wherein the sensor wire outlet circuit board and the bearing wire outlet circuit board are arranged in a split manner or integrated into a whole.

Further, the first axial core assembly comprises: a first axial iron core, wherein a first annular groove and a second annular groove which are concentrically arranged are arranged on the end surface of the first axial iron core close to the thrust bearing, and the first annular groove is positioned outside the second annular groove; a first axial protection ring disposed within the second annular groove; a first axial coil disposed within the first annular groove.

Further, the second axial core assembly includes: a second axial iron core, wherein a third annular groove and a fourth annular groove which are concentrically arranged are arranged on the end surface of the second axial iron core close to the thrust bearing, and the third annular groove is positioned outside the fourth annular groove; a second axial protective ring disposed within the fourth annular groove; a second axial coil disposed within the third annular groove.

Further, the first axial protection ring and the second axial protection ring are made of self-lubricating materials.

Further, the first axial iron core and the second axial iron core are made of magnetic conductive materials, the detection assembly comprises an annular shell, and the annular shell is made of magnetic isolation materials.

Further, the axial displacement sensor and the radial displacement sensor are eddy current sensors.

According to the utility model discloses an on the other hand provides a frock, including the magnetic suspension bearing system, the magnetic suspension bearing system is foretell magnetic suspension bearing system.

Use the technical scheme of the utility model, because the utility model provides a detection assembly sets up on primary shaft iron core subassembly or secondary shaft iron core subassembly, can make detection assembly keep away from and be used for driving the parts that generate heat such as main shaft pivoted electric motor rotor, can avoid the position that the main shaft warp easily, and at this moment, the data that detection assembly detected are unanimous with the actual displacement data of footstep bearing and main shaft, can improve the utility model provides a magnetic suspension bearing system's control accuracy. And simultaneously, for the magnetic suspension bearing system among the prior art, the utility model provides a magnetic suspension bearing system can reduce the length of main shaft owing to integrate the determine module on first axial iron core subassembly or second axial iron core subassembly, and then can improve the mechanical properties and the quality of main shaft.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 schematically illustrates a front view of a prior art magnetic bearing system;

fig. 2 schematically shows a cross-sectional view of a first viewing angle of a magnetic bearing system of the invention;

figure 3 schematically shows a cross-sectional view of a second perspective of the magnetic bearing system of the present invention;

fig. 4 schematically shows a perspective view of the detection assembly of the present invention.

Wherein the figures include the following reference numerals:

10. a main shaft; 20. a thrust bearing; 30. a first axial core assembly; 31. a first axial core; 311. a first annular groove; 312. a second annular groove; 32. a first axial guard ring; 33. a first axial coil; 40. a second axial core assembly; 41. a second axial core; 411. a third annular groove; 412. a fourth annular groove; 42. a second axial guard ring; 43. a second axial coil; 50. a detection component; 51. an annular housing; 52. a radial displacement sensor; 53. an axial displacement sensor; 60. an axial displacement detection ring; 70. a sensor outlet circuit board; 80. bearing outgoing line circuit board.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Referring to fig. 2 to 4, according to an embodiment of the present invention, a magnetic suspension bearing system is provided, and the magnetic suspension bearing system in this embodiment includes a main shaft 10, a thrust bearing 20, a first axial core assembly 30, a second axial core assembly 40, a detection assembly 50, and a controller (not shown in the drawings).

Wherein, the thrust bearing 20 is sleeved on the main shaft 10; the first axial iron core assembly 30 is sleeved on the main shaft 10 and is positioned at a first side of the thrust bearing 20; the second axial iron core assembly 40 is sleeved on the main shaft 10 and is positioned at the second side of the thrust bearing 20; the detection assembly 50 is integrated on either the first axial core assembly 30 or the second axial core assembly 40 and is communicatively coupled to the controller.

During actual work, effect through determine module 50, be convenient for detect the axial and radial displacement of main shaft 10, determine module 50 converts the displacement change volume that detects into signal transmission and gives the controller, control effect through the controller, can control the electric current size of first axial iron core subassembly 30 and second axial iron core subassembly 40, and then control thrust bearing 20's axial displacement, prevent thrust bearing 20 and first axial iron core subassembly 30 and second axial iron core subassembly 40 from taking place axial collision, and then make main shaft 10 get back to safe position.

Because the utility model provides a detection assembly 50 sets up on first axial iron core subassembly 30 or second axial iron core subassembly 40, can make detection assembly 50 keep away from and be used for driving the main shaft 10 pivoted parts that generate heat such as electric motor rotor, can avoid the position that main shaft 10 is out of shape easily, and at this moment, the data that detection assembly 50 detected are unanimous with the actual displacement of footstep bearing 20 and main shaft 10, can improve the control accuracy of the magnetic suspension bearing system in this embodiment. Meanwhile, compared with the magnetic suspension bearing system in the prior art, the magnetic suspension bearing system in the embodiment can reduce the length of the main shaft 10 by integrating the detection assembly 50 on the first axial iron core assembly 30 or the second axial iron core assembly 40, so that the mechanical property and the quality of the main shaft 10 can be improved.

Specifically, the detecting assembly 50 in the present embodiment includes an annular housing 51, a radial displacement sensor 52, and an axial displacement sensor 53, wherein the annular housing 51 has a through hole in the center thereof, and the spindle 10 is located inside the annular housing 51 through the through hole; the radial displacement sensor 52 is arranged on the inner side wall surface of the through hole to facilitate the detection of the radial displacement of the spindle 10; an axial displacement sensor 53 is provided on an end surface of the annular housing 51, for facilitating detection of axial displacement of the spindle 10.

In another embodiment of the present invention, the detecting assembly 50 may only include the axial displacement sensor 53, which may also achieve the effect of improving the control accuracy of the magnetic suspension bearing system in this embodiment, but the control accuracy when the radial displacement sensor 52 is integrally disposed on the magnetic suspension bearing system may be more desirable.

The utility model discloses an in an embodiment, with the integrated one side of keeping away from thrust bearing 20 of the setting of detection component 50 at second axial iron core subassembly 40, correspondingly, in order to facilitate the axial displacement to main shaft 10 to detect, the fixed axial displacement that is provided with detects ring 60 on the main shaft 10 in this embodiment, this axial displacement detects ring 60 and is close to the setting of second axial iron core subassembly 40, axial displacement sensor 53 detects main shaft 10's axial displacement through the clearance that detects axial displacement detection ring 60 and axial displacement sensor 53, moreover, the steam generator is simple in structure, and the realization is convenient. It should be noted that the term "disposed close to the second axial core assembly 40" herein means that the second axial core assembly 40 is not disposed closely to the second axial core assembly 40, but disposed with a certain gap from the second axial core assembly 40.

The magnetic suspension bearing system in this embodiment further includes a sensor outgoing line circuit board 70 and a bearing outgoing line circuit board 80, and the sensor outgoing line circuit board 70 and the bearing outgoing line circuit board 80 may be separately arranged or may be integrally arranged together. When the sensor outgoing line circuit board 70 and the bearing outgoing line circuit board 80 are separately arranged, the bearing outgoing line circuit board 80 of the first axial iron core assembly 30 is installed on the first axial iron core assembly 30, the bearing outgoing line circuit board 80 of the second axial iron core assembly 40 is installed on the second axial iron core assembly 40, and the sensor outgoing line circuit board 70 and the detection assembly 50 are fixed on the same axial iron core assembly.

Referring again to fig. 2 and 3, the first axial core assembly 30 in the present embodiment includes a first axial core 31, a first axial protection ring 32, and a first axial coil 33, wherein the end surface of the first axial core 31 near the thrust bearing 20 has a first annular groove 311 and a second annular groove 312 concentrically arranged, and the first annular groove 311 is located outside the second annular groove 312; when installed, the first axial protection ring 32 is disposed within the second annular groove 312; the first axial coil 33 is disposed in the first annular recess 311.

Correspondingly, the second axial core assembly 40 includes a second axial core 41, a second axial protection ring 42 and a second axial coil 43, the end surface of the second axial core 41 close to the thrust bearing 20 is provided with a third annular groove 411 and a fourth annular groove 412 which are concentrically arranged, and the third annular groove 411 is positioned outside the fourth annular groove 412; when installed, the second axial protection ring 42 is disposed within the fourth annular groove 412; the second axial coil 43 is disposed in the third annular recess 411.

Preferably, the first axial protection ring 32 and the second axial protection ring 42 in this embodiment are made of a self-lubricating material, so as to protect the first axial core 31 and the second axial core 41. The self-lubricating material in this embodiment may be a self-lubricating material such as graphite.

The first axial core 31 and the second axial core 41 in this embodiment are made of a magnetic conductive material. The magnetic conductive material is preferably a material having good magnetic conductivity, such as 45# steel. The annular housing 51 is made of stainless steel or other materials with good magnetic isolation performance, which is convenient for improving the control precision of the magnetic suspension bearing system in the embodiment.

Preferably, the axial displacement sensor 53 and the radial displacement sensor 52 in the present embodiment are both eddy current sensors.

During actual assembly, the thrust bearing 20 is assembled on the main shaft 10, a first axial iron core assembly 30 and a second axial iron core assembly 40 are respectively arranged on two sides of the thrust bearing 20, and gaps are reserved between the first axial iron core assembly 30 and the thrust bearing 20 and between the second axial iron core assembly 40 and the thrust bearing 20; the outgoing line of the detection component 50 is fixed on the sensor outgoing line circuit board 70, and the sensor outgoing line circuit board 70 is fixed on the end face of the first axial iron core component 30, and the bearing outgoing line circuit board 80 is fixed on the second axial iron core component 40; the sensor outgoing line circuit board 70 adopts a multilayer PCB process, and plays a role in shielding and protecting weak current circuits; the axial displacement detecting ring 60 is assembled on the main shaft 10 with a certain gap from the axial displacement sensor.

In actual operation, the radial displacement sensor 52 is responsible for detecting the radial displacement of the main shaft 10, the axial displacement sensor 53 is responsible for detecting the axial displacement of the axial displacement detection ring 60, and when the system operates normally, the thrust bearing 20 and the first axial iron core assembly 30 and the second axial iron core assembly 40 on the two sides keep a set gap; when the thrust bearing 20 is axially displaced, the axial displacement detection ring 60 is also axially displaced, so that no heating shaft section exists between the axial displacement detection ring 60 and the thrust bearing 20, the axial displacement detection ring 60 can well reflect the axial displacement of the thrust bearing 20, the axial displacement sensor 53 transmits the detected displacement data of the axial displacement detection ring 60 to the system controller, and the system controller controls the axial position of the thrust bearing 20 by adjusting the magnitude of input current of the first axial iron core assembly 30 and the second axial iron core assembly 40, so as to prevent the thrust bearing 20 from axially colliding with the first axial iron core assembly 30 and the second axial iron core assembly 40, thereby ensuring the safe and stable operation of the whole magnetic suspension system; when the main shaft 10 is displaced radially, the radial displacement sensor 52 transmits the detected data of the radial displacement of the main shaft 10 to the system controller, and the system controller controls the radial position of the main shaft 10 by adjusting the input current of the radial bearing, so as to ensure the safe and stable operation of the whole magnetic suspension system.

It can be seen that, the utility model discloses on integrating detection component 50 in primary shaft iron core subassembly 30 or secondary shaft iron core subassembly 40, detection component 50 detects data and can see for being main shaft 10 and footstep bearing 20 actual clearance, and detection component 50 detects data and footstep bearing 20 actual clearance unanimously, has improved control accuracy, has reduced main shaft 10 length and quality, has improved main shaft 10 dynamic performance.

According to the utility model discloses a further aspect provides a frock, and the frock here can be the motor, can also be the compressor etc. and the frock in this embodiment includes the magnetic suspension bearing system, and this magnetic suspension bearing system is the magnetic suspension bearing system in above-mentioned embodiment.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the utility model integrates the detection component and the second axial iron core component, which can shorten the length of the main shaft, reduce the quality and processing cost of the main shaft and improve the rotor dynamic performance of the system; meanwhile, the detection assembly can avoid the main heating position of the main shaft, the axial displacement detection error is reduced, and the system control is more accurate.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (12)

1. A magnetic bearing system, comprising:

a main shaft (10);

the thrust bearing (20), the said thrust bearing (20) is fitted over the said main shaft (10);

the first axial iron core assembly (30), the first axial iron core assembly (30) is sleeved on the main shaft (10) and is positioned on the first side of the thrust bearing (20);

the second axial iron core assembly (40), the second axial iron core assembly (40) is sleeved on the main shaft (10) and is positioned at the second side of the thrust bearing (20);

an inspection assembly (50), the inspection assembly (50) being integrated on the first axial core assembly (30) or on the second axial core assembly (40).

2. Magnetic bearing system according to claim 1, characterized in that the detection assembly (50) comprises:

an annular housing (51), the annular housing (51) having a through hole in the center;

a radial displacement sensor (52), the radial displacement sensor (52) being disposed on an inner side wall surface of the through hole.

3. Magnetic bearing system according to claim 2, characterized in that the detection assembly (50) further comprises:

an axial displacement sensor (53), the axial displacement sensor (53) being disposed on an end face of the annular housing (51).

4. Magnetic bearing system according to claim 2, characterized in that the detection assembly (50) is arranged integrally on the side of the second axial core assembly (40) facing away from the thrust bearing (20).

5. Magnetic bearing system according to claim 4, characterized in that an axial displacement detection ring (60) is fixedly arranged on the main shaft (10), the axial displacement detection ring (60) being arranged adjacent to the second axial core assembly (40).

6. The magnetic suspension bearing system according to claim 1, further comprising a sensor outlet circuit board (70) and a bearing outlet circuit board (80), wherein the sensor outlet circuit board (70) and the bearing outlet circuit board (80) are separately arranged or integrally arranged.

7. Magnetic bearing system according to claim 2, characterized in that the first axial core assembly (30) comprises:

a first axial core (31), wherein the end surface of the first axial core (31) close to the thrust bearing (20) is provided with a first annular groove (311) and a second annular groove (312) which are concentrically arranged, and the first annular groove (311) is positioned outside the second annular groove (312);

a first axial protection ring (32), the first axial protection ring (32) disposed within the second annular groove (312);

a first axial coil (33), the first axial coil (33) disposed within the first annular groove (311).

8. Magnetic bearing system according to claim 7, characterized in that the second axial core assembly (40) comprises:

a second axial iron core (41), wherein the end face, close to the thrust bearing (20), of the second axial iron core (41) is provided with a third annular groove (411) and a fourth annular groove (412) which are concentrically arranged, and the third annular groove (411) is positioned outside the fourth annular groove (412);

a second axial protective ring (42), the second axial protective ring (42) disposed within the fourth annular groove (412);

a second axial coil (43), the second axial coil (43) being disposed within the third annular recess (411).

9. Magnetic bearing system according to claim 8, characterized in that the first axial protection ring (32) and the second axial protection ring (42) are made of a self-lubricating material.

10. Magnetic bearing system according to claim 8, characterized in that the first axial core (31) and the second axial core (41) are made of magnetically conductive material, the detection assembly (50) comprises an annular housing (51), and the annular housing (51) is made of magnetically isolating material.

11. Magnetic bearing system according to claim 3, characterized in that the axial displacement sensor (53) and the radial displacement sensor (52) are both eddy current sensors.

12. A tool comprising a magnetic bearing system, wherein the magnetic bearing system is according to any one of claims 1 to 11.

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