CN217010608U - Magnetic suspension compressor abnormal shutdown protection device - Google Patents
Magnetic suspension compressor abnormal shutdown protection device Download PDFInfo
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- CN217010608U CN217010608U CN202123271764.9U CN202123271764U CN217010608U CN 217010608 U CN217010608 U CN 217010608U CN 202123271764 U CN202123271764 U CN 202123271764U CN 217010608 U CN217010608 U CN 217010608U
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- auxiliary bearing
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Abstract
An abnormal shutdown protection device of a magnetic suspension compressor is arranged at the rear end of a motor spindle and comprises a bearing seat, an auxiliary bearing, a buffer device and a limiting and locking nut. The rear end of the motor spindle comprises at least two stages of steps which are a first step and a second step from front to back in sequence, and the radial dimension of the first step and the second step decreases gradually backwards. The auxiliary bearing is sleeved at the rear end of the motor spindle, the front side face of the auxiliary bearing is in clearance fit with the first step, and the rear side face of the auxiliary bearing is in clearance fit with the buffer device. The auxiliary bearing is arranged in a bearing seat, and the front end of the bearing seat is fixedly connected with the rear thrust magnetic bearing. The rear end of the motor spindle is sleeved with the buffer device, the front side face of the buffer device is abutted against the second step and is positioned, and the rear side face of the buffer device is attached to the limiting locking nut. The buffer device comprises a buffer washer sleeved at the rear end of the motor spindle and positioned between the auxiliary bearing and the limiting locking nut. And the limiting locking nut is connected and fixed with the rear end of the motor spindle in a threaded fit manner. The utility model reduces the cost of the compressor and improves the reliability of the compressor.
Description
Technical Field
The utility model relates to the technical field of magnetic suspension compressors, in particular to an abnormal shutdown protection device for a magnetic suspension compressor.
Background
The magnetic suspension compressor applies expensive to almost inaccessible magnetic suspension bearing technology used in the aerospace field to the traditional compressor, replaces a mechanical bearing with an electromagnetic bearing, breaks through the limitation of rotating speed, can rotate at high speed of more than 10000RPM by using an impeller with a small diameter, obtains enough separation speed, and thoroughly realizes the miniaturization of the centrifugal compressor.
In the operation process of the magnetic suspension compressor, if the magnetic suspension compressor is in emergency power off or the magnetic suspension compressor is abnormally stopped to cause state instability, instantaneous axial movement can be caused due to the fact that front-back pressure difference is formed by high-speed rotation of an impeller, the auxiliary bearing needs to absorb large axial impact load, if good protection measures are not provided, the auxiliary bearing is easily damaged, and therefore the reliability of the magnetic suspension compressor is reduced.
In order to avoid damaging the bearing, the existing solution in the industry is to select an ultra-precise ceramic bearing, and the strength of the bearing is enhanced to bear the axial impact load, however, the method still has some problems in the actual use process:
the ultra-precise ceramic bearing is high in price, so that the hardware cost of the whole machine is increased;
second, through changing the intensity that the bearing material promoted shock resistance, though can solve the problem to a certain extent, nevertheless along with live time's lapse, its structural strength still can the gradual variation, finally still can't avoid damaging.
In conclusion, the prior art has the defects of high cost, incapability of ensuring the service life, low reliability and the like. Therefore, how to solve the above-mentioned deficiencies of the prior art is a problem to be solved by the present invention.
Disclosure of Invention
The utility model aims to provide an abnormal shutdown protection device for a magnetic suspension compressor.
In order to achieve the purpose, the utility model adopts the technical scheme that: the magnetic suspension compressor abnormal shutdown protection device is characterized in that: is arranged corresponding to the rear end of the motor main shaft; the protection device comprises a bearing seat, an auxiliary bearing, a buffer device and a limiting and locking nut;
the rear end of the motor spindle comprises at least two steps, namely a first step and a second step from front to back in sequence, and the radial sizes of the steps are gradually reduced backwards;
the auxiliary bearing is sleeved at the rear end of the motor main shaft, and the front side surface of the auxiliary bearing is in clearance fit with the first step; the auxiliary bearing is arranged in the bearing seat, and the front end of the bearing seat is fixedly connected with a rear thrust magnetic bearing in a thrust assembly;
the rear side surface of the auxiliary bearing is in clearance fit with the buffer device;
the buffer device is sleeved at the rear end of the motor spindle, the front side surface of the buffer device abuts against and is positioned on the second step, and the rear side surface of the buffer device is attached to the limiting and locking nut; the buffer device comprises a buffer washer, the buffer washer is sleeved at the rear end of the motor spindle and is positioned between the auxiliary bearing and the limiting and locking nut, and the buffer washer is used for buffering an axial impact load generated when the magnetic suspension compressor is abnormally stopped;
and the limiting and locking nut is connected and fixed with the rear end of the motor spindle in a threaded fit manner.
The relevant content in the above technical solution is explained as follows:
1. in the above scheme, the thrust assembly further comprises a front thrust magnetic bearing and a thrust disk, the thrust disk and the motor spindle are fixed by a hot jacket, and the front thrust magnetic bearing and the rear thrust magnetic bearing are respectively arranged on the front side and the rear side of the thrust disk and are in clearance fit with the thrust disk.
2. In the above scheme, the locking device further comprises a third step, the third step is located on the rear side of the second step, the radial size of the third step is smaller than that of the second step, and the front side face of the limiting locking nut abuts against and is located on the third step.
3. In the above scheme, the buffering device further comprises two limiting washers, one of the limiting washers is arranged between the buffering washer and the auxiliary bearing, and the other limiting washer is arranged between the buffering washer and the limiting lock nut.
4. In the above scheme, the cushion washer is of an annular structure, and a notch is arranged on the annular structure.
5. In the above scheme, the buffer washer is a metal washer, one of two stress surfaces of the buffer washer is a buffer surface, the buffer surface is provided with uniformly distributed special-shaped bulges, and the buffer surface is opposite to the auxiliary bearing.
6. In the above scheme, the buffer washer is a metal washer, one of two stress surfaces of the buffer washer is a buffer surface, the buffer surface is provided with uniformly distributed wave structures, and the buffer surface is opposite to the auxiliary bearing.
7. In the above scheme, the cushion ring is a metal cushion ring, two stress surfaces of the cushion ring are cushion surfaces, and each cushion surface is provided with uniformly distributed special-shaped bulges.
8. In the above scheme, the cushion washer is a metal washer, two stress surfaces of the cushion washer are cushion surfaces, and each cushion surface is provided with a uniformly distributed wave structure.
9. In the above scheme, the irregular-shaped protrusion comprises an elliptical protrusion and a circular protrusion.
10. In the above scheme, the cushion washer is a rubber washer.
The working principle of the utility model is as follows:
the magnetic suspension compressor abnormal shutdown protection device is arranged at the rear end of a motor spindle and comprises a bearing seat, an auxiliary bearing, a buffer device and a limiting locking nut. The rear end of the motor spindle comprises at least two stages of steps which are a first step and a second step from front to back in sequence, and the radial dimension of the first step and the second step decreases gradually backwards. The auxiliary bearing is sleeved at the rear end of the motor spindle, the front side surface of the auxiliary bearing is in clearance fit with the first step, and the rear side surface of the auxiliary bearing is in clearance fit with the buffer device. The auxiliary bearing is arranged in a bearing seat, and the front end of the bearing seat is fixedly connected with the rear thrust magnetic bearing. The rear end of the motor spindle is sleeved with the buffer device, the front side face of the buffer device is abutted against the second step and is positioned, and the rear side face of the buffer device is attached to the limiting locking nut. The buffer device comprises a buffer washer sleeved at the rear end of the motor spindle and positioned between the auxiliary bearing and the limiting locking nut. And the limiting locking nut is connected and fixed with the rear end of the motor spindle in a threaded fit manner. The utility model reduces the cost of the whole compressor and improves the reliability of the compressor.
Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages and effects:
1. because the buffer scheme combining the auxiliary bearing and the buffer device is adopted, the buffer scheme using expensive bearings such as ultra-precise ceramic bearings and the like originally is replaced, and the hardware cost of the whole machine is reduced.
2. Because the buffer device is used, the axial impact load acting on the auxiliary bearing is reduced, the possibility of damaging the auxiliary bearing is reduced, and the service life of the auxiliary bearing is prolonged.
3. Because the buffer device is arranged between the auxiliary bearing and the limiting lock nut, the buffer device is utilized to absorb the axial impact load, the axial force required to be borne by the auxiliary bearing is reduced, and the reliability is enhanced.
Drawings
FIG. 1 is a schematic structural diagram of a magnetic suspension compressor abnormal shutdown protection device in a normal working state according to an embodiment of the present invention;
FIG. 2 is a sectional view of the magnetic levitation compressor abnormal shutdown protection apparatus of the embodiment of the present invention under a normal working condition;
FIG. 3 is an enlarged view of FIG. 2 at A;
FIG. 4 is an exploded view of a damping device and a limit lock nut according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of a cushion ring according to an embodiment of the present invention;
FIG. 6 is a front view of a cushion ring according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of the magnetic levitation compressor abnormal shutdown protection device in an abnormal shutdown state according to the embodiment of the present invention;
FIG. 8 is a sectional view of the magnetic levitation compressor abnormal shutdown protection apparatus according to the embodiment of the present invention in an abnormal shutdown state;
FIG. 9 is an enlarged view of FIG. 8 at B;
FIG. 10 is a front view of a cushion ring in normal operation in accordance with an embodiment of the present invention;
FIG. 11 is a side view of a cushion ring in normal operation in accordance with an embodiment of the present invention;
FIG. 12 is an enlarged view at C of FIG. 11;
FIG. 13 is a front view of a cushion ring in an abnormal shutdown condition in accordance with an embodiment of the present invention;
FIG. 14 is a side view of a cushion ring in an abnormal shutdown condition in accordance with an embodiment of the present invention;
FIG. 15 is an enlarged view at D of FIG. 14;
FIG. 16 is an exploded view of another embodiment including only a cushion ring;
FIG. 17 is a schematic structural view of another embodiment of a cushion ring according to an embodiment of the present invention;
FIG. 18 is a front view of another embodiment cushion ring in accordance with an embodiment of the present invention;
FIG. 19 is a schematic structural view of another embodiment of a cushion ring according to an embodiment of the present invention;
FIG. 20 is a front view of another embodiment cushion ring in accordance with an embodiment of the present invention;
FIG. 21 is a schematic view of another embodiment of a cushion ring according to the present invention;
FIG. 22 is a front view of another embodiment cushion ring in accordance with an embodiment of the present invention;
FIG. 23 is a schematic structural view of another embodiment of a cushion ring according to an embodiment of the present invention;
FIG. 24 is a front view of another embodiment of a cushion ring in accordance with an embodiment of the present invention;
FIG. 25 is a schematic view of another embodiment of a cushion ring according to the present invention;
fig. 26 is a front view of another embodiment cushion ring in accordance with an embodiment of the present invention.
In the drawings above: 1. a motor spindle; 2. a motor rotor; 3. a front thrust magnetic bearing; 4. a thrust plate; 5. a rear thrust magnetic bearing; 6. an impeller; 7. a bearing seat; 8. an auxiliary bearing; 901. a limiting washer; 902. a limiting washer; 10. a cushion washer; 11. limiting and locking the nut; 12. irregular bulges; 13. a first step; 14. a second step; 15. a third step; 16. and (3) a waveform structure.
Detailed Description
The utility model is further described with reference to the following figures and examples:
the present disclosure will be described in detail and with reference to the drawings, and it is to be understood that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms "a", "an", "the" and "the", as used herein, also include the plural forms.
As used herein, "connected" or "positioned" refers to two or more elements or devices being in direct or indirect physical contact with each other, and may also refer to two or more elements or devices being in operation or action with each other.
As used herein, the terms "comprising," "including," "having," and the like are open-ended terms that mean including but not limited to.
As used herein, the term (terms), unless otherwise indicated, shall generally have the ordinary meaning as commonly understood by one of ordinary skill in the art, in this written description and in the claims. Certain words used to describe the disclosure are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the disclosure.
The terms "front" and "back" used herein are directional terms, and are used only for describing the positional relationship between the structures, and are not intended to limit the protection schemes and the actual implementation directions.
The embodiment is as follows: abnormal shutdown protection device for magnetic suspension compressor
Referring to fig. 1 to 4, the magnetic levitation compressor abnormal shutdown protection device is provided corresponding to the rear end of the motor spindle 1. The protection device comprises a bearing seat 7, an auxiliary bearing 8, a buffer device and a limiting lock nut 11.
The rear end of the motor spindle 1 comprises three steps, namely a first step 13, a second step 14 and a third step 15 from front to back in sequence, and the radial size of the steps is gradually reduced backwards.
The auxiliary bearing 8 is sleeved at the rear end of the motor main shaft 1, and the front side surface of the auxiliary bearing 8 is in clearance fit with the first step 13; the auxiliary bearing 8 is arranged in the bearing seat 7, and the front end of the bearing seat 7 is fixedly connected with a rear thrust magnetic bearing 5 in a thrust assembly.
The thrust assembly further comprises a front thrust magnetic bearing 3 and a thrust disc 4, the thrust disc 4 and the motor spindle 1 are fixed in a hot-sleeved mode, and the front thrust magnetic bearing 3 and the rear thrust magnetic bearing 5 are respectively arranged on the front side and the rear side of the thrust disc 4 and are in clearance fit with the thrust disc 4.
The rear side of the auxiliary bearing 8 is in clearance fit with the buffer device.
The rear end of the motor spindle 1 is sleeved with the buffer device, the front side face of the buffer device abuts against and is positioned on the second step 14, and the rear side face of the buffer device is attached to the limiting locking nut 11.
The buffer device comprises two limit washers and a buffer washer 10, wherein one limit washer 901 is arranged between the buffer washer 10 and the auxiliary bearing 8, and the other limit washer 902 is arranged between the buffer washer 10 and the limit lock nut 11, so as to increase the contact surface between the auxiliary bearing 8 and the buffer device. The buffer washer 10 is sleeved at the rear end of the motor spindle 1, is positioned between the two limiting washers, and is used for buffering an axial impact load generated when the magnetic suspension compressor is abnormally stopped.
And the limiting locking nut 11 is connected and fixed with the rear end of the motor spindle 1 in a threaded fit manner.
As shown in fig. 5, the cushion washer 10 is a metal washer, two stress surfaces of the cushion washer 10 are cushion surfaces, and each cushion surface is provided with uniformly distributed irregular protrusions 12. The cushion ring 10 is an annular structure, and a gap is formed in the annular structure.
The specific working principle of the embodiment of the utility model is summarized as follows:
when the compressor normally operates, the thrust disc maintains a rotor assembly at a theoretical central position under the action of the front thrust magnetic bearing 3 and the rear thrust magnetic bearing 5, wherein the rotor assembly comprises an impeller 6, a motor spindle 1 and a motor rotor 2. In the normal operation process, the impeller 6, the motor spindle 1, the motor rotor 2 and the thrust disc operate together. As shown in fig. 3, when the compressor normally operates, the auxiliary bearing 8 is kept in conformity with the clearance between the first step 13 and the front and rear sides of the buffer device, which is the theoretical clearance δ; as shown in fig. 10 to 12, in this state, the cushion washer 10 is in a free state, and in order to ensure the normal operation of the compressor, a telescopic space is reserved for the cushion washer 10, and a notch is formed in the cushion washer 10, and the angle of the notch is α °.
As shown in fig. 7 to 9, when the compressor is in emergency shutdown, the front thrust magnetic bearing 3 and the rear thrust magnetic bearing 5 are suddenly de-energized, and the shafting suspension cannot be guaranteed, at this time, the impeller 6, the motor spindle 1, the motor rotor 2 and the thrust disc rapidly move forward under the action of the front-rear pressure difference of the impeller 6, the rear side surface of the auxiliary bearing 8 contacts the buffer device first, and the buffer washer 10 is compressed to absorb the axial impact load. As shown in fig. 9, in order to ensure safe shutdown of the compressor in case of emergency shutdown, the compression amount of the cushion washer 10 is x, and the gap between the front side surface of the auxiliary bearing 8 and the first step 13 is (2 δ + x); as shown in fig. 13 to 15, when the emergency stop is performed, the cushion washer 10 is compressed by the instant axial impact load, the reserved compression space is reduced, the gap is smaller by β °, and the angle is changed to (α - β) °.
Other embodiments and structural variations of the present invention are described below:
1. in the above embodiment, the buffer device includes two limiting washers and one buffering washer 10, but the present invention is not limited thereto, and as shown in fig. 16, the buffer device may include only one buffering washer 10. With this structure, it is only necessary to align the cushion face of the cushion washer 10 with the auxiliary bearing 8 for withstanding the axial impact load at the time of abnormal shutdown.
2. In the above embodiment, the cushion washer 10 is a metal washer, the two stressed surfaces of the cushion washer 10 are cushion surfaces, and each cushion surface is provided with the uniformly distributed irregular protrusions 12. However, the present invention is not limited to this, and as shown in fig. 17 to 26, the cushion washer 10 may be a metal washer provided with the uniformly distributed irregular protrusions 12 on only one side, a metal washer with circular protrusion wave points, a metal washer with a wave structure, or a rubber washer.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The magnetic suspension compressor abnormal shutdown protection device is characterized in that: is arranged corresponding to the rear end of the motor spindle (1); the protection device comprises a bearing seat (7), an auxiliary bearing (8), a buffer device and a limiting lock nut (11);
the rear end of the motor spindle (1) comprises at least two steps, namely a first step (13) and a second step (14) from front to back in sequence, and the radial sizes of the steps are gradually reduced backwards;
the auxiliary bearing (8) is sleeved at the rear end of the motor main shaft (1), and the front side surface of the auxiliary bearing (8) is in clearance fit with the first step (13); the auxiliary bearing (8) is arranged in the bearing seat (7), and the front end of the bearing seat (7) is fixedly connected with a rear thrust magnetic bearing (5) in a thrust assembly;
the rear side surface of the auxiliary bearing (8) is in clearance fit with the buffer device;
the buffer device is sleeved at the rear end of the motor spindle (1), the front side surface of the buffer device abuts against and is positioned on the second step (14), and the rear side surface of the buffer device is attached to the limiting and locking nut (11); the buffer device comprises a buffer washer (10), and the buffer washer (10) is sleeved at the rear end of the motor spindle (1) and is positioned between the auxiliary bearing (8) and the limiting locking nut (11);
and the limiting locking nut (11) is connected and fixed with the rear end of the motor spindle (1) in a threaded fit manner.
2. The magnetic levitation compressor abnormal shutdown protection device as recited in claim 1, wherein: the limiting and locking nut is characterized by further comprising a third step (15), the third step (15) is located on the rear side of the second step (14), the radial size of the third step (15) is smaller than that of the second step (14), and the front side face of the limiting and locking nut (11) abuts against and is located on the third step (15).
3. The magnetic levitation compressor abnormal shutdown protection device as recited in claim 1, wherein: the buffer device further comprises two limiting washers, one limiting washer (901) is arranged between the buffer washer (10) and the auxiliary bearing (8), and the other limiting washer (902) is arranged between the buffer washer (10) and the limiting lock nut (11).
4. The magnetic levitation compressor abnormal shutdown protection device as recited in claim 1, wherein: the buffer gasket (10) is of an annular structure, and a notch is formed in the annular structure.
5. The magnetic levitation compressor abnormal shutdown protection device as recited in claim 1, wherein: the buffer washer (10) is a metal washer, one of two stress surfaces of the buffer washer (10) is a buffer surface, the buffer surface is provided with uniformly distributed special-shaped bulges (12), and the buffer surface is opposite to the auxiliary bearing (8).
6. The magnetic levitation compressor abnormal shutdown protection device as recited in claim 1, wherein: the buffer washer (10) is a metal washer, one of two stress surfaces of the buffer washer (10) is a buffer surface, the buffer surface is provided with uniformly distributed wave structures (16), and the buffer surface is opposite to the auxiliary bearing (8).
7. The magnetic levitation compressor abnormal shutdown protection device as recited in claim 1, wherein: the buffer gasket (10) is a metal gasket, two stress surfaces of the buffer gasket (10) are buffer surfaces, and each buffer surface is provided with uniformly distributed special-shaped bulges (12).
8. The magnetic levitation compressor abnormal shutdown protection device as recited in claim 1, wherein: the buffer gasket (10) is a metal gasket, two stress surfaces of the buffer gasket (10) are buffer surfaces, and each buffer surface is provided with a uniformly distributed wave-shaped structure (16).
9. Abnormal shutdown protection device for a magnetic levitation compressor as claimed in claim 5 or 7, characterized in that: the special-shaped bulge (12) is an oval bulge or a circular bulge.
10. The magnetic levitation compressor abnormal shutdown protection device as recited in claim 1, wherein: the buffer gasket (10) is a rubber gasket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123271764.9U CN217010608U (en) | 2021-12-23 | 2021-12-23 | Magnetic suspension compressor abnormal shutdown protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123271764.9U CN217010608U (en) | 2021-12-23 | 2021-12-23 | Magnetic suspension compressor abnormal shutdown protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217010608U true CN217010608U (en) | 2022-07-19 |
Family
ID=82387697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123271764.9U Active CN217010608U (en) | 2021-12-23 | 2021-12-23 | Magnetic suspension compressor abnormal shutdown protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217010608U (en) |
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2021
- 2021-12-23 CN CN202123271764.9U patent/CN217010608U/en active Active
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