CN216216330U - Magnetic suspension motor and magnetic suspension centrifugal compressor - Google Patents
Magnetic suspension motor and magnetic suspension centrifugal compressor Download PDFInfo
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- CN216216330U CN216216330U CN202122338869.5U CN202122338869U CN216216330U CN 216216330 U CN216216330 U CN 216216330U CN 202122338869 U CN202122338869 U CN 202122338869U CN 216216330 U CN216216330 U CN 216216330U
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- damper
- rotating shaft
- inner sleeve
- shell
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Abstract
The utility model belongs to the technical field of power devices, and particularly provides a magnetic suspension motor and a magnetic suspension centrifugal compressor. The utility model aims to solve the problem that a protective bearing of the existing magnetic suspension motor is easy to damage due to the collision of a rotating shaft, and therefore, the magnetic suspension motor comprises a shell, the rotating shaft, a radial magnetic suspension bearing, an axial thrust bearing, a protective bearing and a damper. Wherein, the rotating shaft is rotatably arranged in the shell. The radial magnetic suspension bearing is positioned on the inner side of the shell and fixedly connected with the shell, the axial thrust bearing is positioned on the inner side of the shell and fixedly connected with the shell, the protection bearing is positioned on the inner side of the shell, and the damper is arranged between the shell and the protection bearing and used for absorbing vibration of the protection bearing. The magnetic suspension motor can effectively protect the protective bearing, and the service life of the protective bearing is prolonged.
Description
Technical Field
The utility model belongs to the technical field of power devices, and particularly provides a magnetic suspension motor and a magnetic suspension centrifugal compressor.
Background
Magnetic levitation motors and magnetic levitation centrifugal compressors using the same are often used in refrigerators, air conditioners, and other cooling and heating devices. The magnetic suspension motor mainly comprises a machine shell, a stator, a rotating shaft, a radial magnetic suspension bearing and an axial thrust bearing, wherein the stator is arranged in the machine shell and is fixedly connected with the machine shell, the rotating shaft is arranged in the stator, the radial magnetic suspension bearing is used for supporting the rotating shaft to rotate, and the axial thrust bearing is used for keeping the axial position of the rotating shaft. The magnetic suspension motor also comprises a protective bearing arranged in the shell, and the protective bearing is used for bearing the static rotating shaft to prevent the rotating shaft from contacting with the radial magnetic suspension bearing, so that the radial magnetic suspension bearing is protected. When the magnetic suspension motor works, the radial magnetic suspension bearing is electrified to separate the rotating shaft from the protection bearing and suspend the rotating shaft.
When the magnetic suspension motor is powered off or the current and voltage are unstable, the rotating shaft rotating at high speed loses buoyancy or the buoyancy is unstable, so that the rotating shaft and the protective bearing repeatedly collide with each other with larger impact force, the protective bearing vibrates, and the protective bearing is easily damaged in the past.
SUMMERY OF THE UTILITY MODEL
One object of the present invention is to solve the problem that the protective bearing of the existing magnetic levitation motor is easily damaged due to the impact of the rotating shaft.
To achieve the above object, the present invention provides a magnetic levitation motor, comprising:
a housing;
a rotating shaft provided with a push disk extending outward in a radial direction thereof;
the radial magnetic suspension bearing is fixedly connected with the machine shell and is arranged between the machine shell and the rotating shaft along the radial direction of the rotating shaft;
the axial thrust bearing is fixedly connected with the shell and is arranged between the shell and the push disc along the axial direction of the rotating shaft;
a first annular gap is formed between the protection bearing and the shell, and a second annular gap is formed between the protection bearing and the rotating shaft;
a plurality of dampers disposed between the housing and the protective bearing.
Optionally, the damper is a rod damper which is telescopic along the self axial direction; and/or the number of dampers is even; and/or a plurality of dampers are distributed at equal intervals along the circumferential direction of the protection bearing.
Optionally, the damper comprises:
an outer sleeve;
the inner sleeve is arranged in the outer sleeve and divides the inner space of the outer sleeve into an annular cavity and a cylindrical cavity, and a plurality of damping holes distributed along the axial direction of the inner sleeve are formed in the side wall of the inner sleeve;
a piston slidably disposed within the inner sleeve;
the piston rod is fixedly connected with the piston;
one end of the spring is abutted with the piston, and the other end of the spring is abutted with the outer sleeve or the inner sleeve;
a damping fluid filled in the outer sleeve and capable of flowing between the annular chamber and the cylindrical chamber through the damping hole.
Optionally, the damping holes increase in diameter sequentially from the first end of the inner sleeve to the second end of the inner sleeve.
Optionally, the distribution density of the damping holes on the inner sleeve increases in sequence from the first end of the inner sleeve to the second end of the inner sleeve.
Optionally, the casing is provided with a plurality of mounting holes pointing to the rotating shaft, and the damper is inserted into the mounting holes and abuts against the protective bearing.
Optionally, at least a portion of the mounting hole is a threaded hole; the magnetic levitation motor further includes a screw member screwed into the screw hole and abutting against the damper.
Optionally, a roller is disposed at an end of the damper close to the protection bearing, so that the damper is in rolling contact with the protection bearing through the roller.
Optionally, the protective bearing is a ball bearing.
In addition, the utility model also provides a magnetic suspension centrifugal compressor which comprises the magnetic suspension motor in any one of the technical schemes.
Based on the foregoing description, it can be understood by those skilled in the art that, in the foregoing technical solution of the present invention, by forming the first annular gap between the protection bearing and the casing and providing the plurality of dampers between the casing and the protection bearing, the protection bearing can be displaced correspondingly with the movement of the rotating shaft when being impacted by the rotating shaft, and thus compress the dampers, so as to reduce the impact force of the rotating shaft on the protection bearing. Meanwhile, the compressed damper can also absorb the vibration generated by the protective bearing, so that the protective bearing is effectively protected, and the service life of the protective bearing is prolonged.
Further, the diameters of the damping holes in the inner sleeve are sequentially increased from the first end of the inner sleeve to the second end of the inner sleeve, and/or the distribution density of the damping holes in the inner sleeve is sequentially increased from the first end of the inner sleeve to the second end of the inner sleeve, so that the damping force of the damper is smaller when the damper is just compressed, and therefore a quick and sensitive response can be made to absorb and protect slight vibration of the bearing. When the shock of the protection bearing is large, the compression amount and the resistance of the damper are large, so that the damper can absorb the shock of the protection bearing as much as possible.
Still further, through screwing into the screw hole and with the attenuator butt for operating personnel can adjust the distance between attenuator and the protection bearing through the degree of depth of adjusting the screw member and screwing in, so that all attenuators all with protection bearing butt in the normal pivoted in-process of pivot, make protection bearing and pivot coaxial as far as possible, in order to prevent protection bearing and pivot contact.
Furthermore, the roller is arranged at one end, close to the protection bearing, of the damper, so that the damper can be in rolling contact with the protection bearing through the roller, and when the rotating shaft rotating at a high speed is in contact with the protection bearing and the outer ring of the protection bearing is driven to rotate, the friction resistance between the protection bearing and the damper is reduced, and the damper is prevented from being damaged by friction of the protection bearing.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly explain the technical solution of the present invention, some embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. Those skilled in the art will appreciate that elements or portions of the same reference number identified in different figures are the same or similar; the drawings of the utility model are not necessarily to scale relative to each other. In the drawings:
FIG. 1 is a schematic diagram of a magnetic levitation motor in some embodiments of the present invention;
FIG. 2 is an enlarged view of the A portion of the magnetic levitation motor of FIG. 1;
FIG. 3 is a schematic view of the distribution of dampers relative to a protective bearing in some embodiments of the present invention;
figure 4 is a schematic view of the damper configuration in some embodiments of the utility model.
Detailed Description
It should be understood by those skilled in the art that the embodiments described below are only a part of the embodiments of the present invention, not all of the embodiments of the present invention, and the part of the embodiments are intended to explain the technical principles of the present invention and not to limit the scope of the present invention. All other embodiments, which can be obtained by a person skilled in the art based on the embodiments provided by the present invention without inventive effort, shall still fall within the scope of protection of the present invention.
It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The magnetic levitation motor of the present invention will be described in detail with reference to fig. 1 to 4. Wherein, fig. 1 is a schematic structural diagram of a magnetic levitation motor in some embodiments of the present invention, fig. 2 is an enlarged view of a portion a of the magnetic levitation motor in fig. 1, fig. 3 is a schematic structural diagram of a damper in some embodiments of the present invention with respect to a protective bearing, and fig. 4 is a schematic structural diagram of a damper in some embodiments of the present invention.
It should be noted that, for convenience of description and to enable those skilled in the art to quickly understand the technical solution of the present invention, only the technical features that are strongly related (directly related or indirectly related) to the technical problem and/or the technical concept to be solved by the present invention will be described later, and no detailed description will be given to the technical features that are weakly related to the technical problem and/or the technical concept to be solved by the present invention. Since the technical features with the weak degree of association belong to the common general knowledge in the field, the present invention does not cause insufficient disclosure of the present invention even if the features with the weak degree of association are not described.
As shown in fig. 1 and 2, in some embodiments of the present invention, a magnetic levitation motor includes a housing 1, a rotating shaft 2, a radial magnetic levitation bearing 3, an axial thrust bearing 4, a protection bearing 5, a damper 6, and an optional screw member 7. Wherein, the rotating shaft 2 is rotatably arranged in the casing 1. The radial magnetic suspension bearing 3 is located inside the casing 1 and fixedly connected to the casing 1, and the radial magnetic suspension bearing 3 is used for providing a magnetic force in a radial direction to the rotating shaft 2 so that the rotating shaft 2 is magnetically suspended in the casing 1 in the radial direction. The axial thrust bearing 4 is located inside the casing 1 and is fixedly connected with the casing 1, and the axial thrust bearing 4 is used for providing an axial magnetic force for the rotating shaft 2 so that the rotating shaft 2 is magnetically suspended in the casing 1 in the axial direction. The protection bearing 5 is located inside the housing 1 and is used to carry the rotating shaft 2 at rest to avoid the rotating shaft 2 from contacting the radial magnetic suspension bearing 3, thereby protecting the radial magnetic suspension bearing 3 from being damaged by the rotating shaft 2. The damper 6 is disposed between the casing 1 and the protection bearing 5 for absorbing vibration of the protection bearing 5. The screw member 7 is installed on the housing 1 in a threaded manner and abuts against the damper 6, and the screw member 7 is used for adjusting the distance and the pretightening force between the damper 6 and the protection bearing 5.
With continued reference to fig. 1 and 2, the protection bearing 5 has a first annular gap 81 with the housing 1, and the protection bearing 5 has a second annular gap 82 with the rotating shaft 2. The first annular gap 81 serves to allow the protection bearing 5 to move in the radial direction with respect to the casing 1 to compress the damper 6, so that the damper 6 absorbs the shock of the protection bearing 5. The second annular gap 82 is used to keep the rotating shaft 2 from contacting the protective bearing 5.
Further, the sum of the first annular gap 81 and the second annular gap 82 is smaller than the gap between the radial magnetic bearing 3 and the rotating shaft 2 to ensure that the rotating shaft 2 does not contact the radial magnetic bearing 3.
With continued reference to fig. 1 and 2, the housing 1 is provided with a plurality of mounting holes 11, the mounting holes 11 being adapted to receive at least a portion of the damper 6 and to mount the threaded member 7. During the assembly of the magnetic levitation motor, the damper 6 is inserted into the mounting hole 11, and the screw member 7 is screwed into the mounting hole 11. Preferably, one damper 6 and one screw member 7 are installed in each of the installation holes 11.
Further, in order to achieve the mounting and fixing of the screw member 7, at least a portion of the mounting hole 11 is a screw hole, so that the screw member 7 is fixed to the cabinet 1 through the screw hole.
Further, in the case where the damper 6 can be mounted in the mounting hole 11 and can abut against the protective bearing 5, a person skilled in the art may also provide the damper 6 and the screw member 7 as a single body or omit the provision of the screw member 7 and provide the damper 6 with an external thread as necessary in other embodiments of the present invention. Further, it is also possible for those skilled in the art to set the mounting hole 11 as a counter bore opened from the inside of the cabinet 1 and to mount the damper 6 into the mounting hole 11 from the inside of the cabinet 1 as needed, which only tends to increase the difficulty of processing and assembling.
With continued reference to fig. 1 and 2, the shaft 2 is provided with a push plate 21 extending radially outwardly therefrom. An axial thrust bearing 4 is respectively arranged on two sides of the push disc 21 in the axial direction of the rotating shaft 2. The two axial thrust bearings 4 are used for providing magnetic force in the axial direction for the push disc 21, so that the push disc 21 is not in contact with the two axial thrust bearings 4 under the action of the magnetic force.
In the present invention, the protection bearing 5 may be a ball bearing or a roller bearing.
As shown in fig. 1 to 3, the damper 6 is preferably a rod-type damper that is stretchable in its own axial direction. Further, the damper 6 is plural, and the plural dampers 6 are distributed at equal intervals in the circumferential direction of the protection bearing 4. Preferably, the number of dampers 6 is even.
In the present invention, the damper 6 may be a pure spring type damper, a pneumatic type damper, or a hydraulic type damper. In the preferred embodiment of the present invention, the damper 6 is a hydraulic damper. The structure of the hydraulic damper 6 will be described in detail with reference to fig. 4.
As shown in fig. 4, the damper 6 includes an outer sleeve 61, an inner sleeve 62, a piston 63, a piston rod 64, a spring 65, a damping fluid (not shown in the drawings), and an optional roller 66. The damping fluid is filled in the outer sleeve 61, and may be any feasible fluid, such as water, oil, etc.
With continued reference to FIG. 4, the inner sleeve 62 is disposed within the outer sleeve 61 and divides the interior space of the outer sleeve 61 into an annular chamber 611 and a cylindrical chamber 612, and the side wall of the inner sleeve 62 is provided with a plurality of damping holes 621 distributed axially therealong. The damping fluid filled in the outer sleeve 61 can flow between the annular chamber 611 and the cylindrical chamber 612 through the damping hole 621.
Alternatively, the diameter of the damping hole 321 increases in order from the first end of the inner sleeve 62 (the lower end of the inner sleeve 62 in fig. 4) to the second end of the inner sleeve 62 (the upper end of the inner sleeve 62 in fig. 4); and/or the distribution density of the damping holes 621 in the inner sleeve 62 increases in order from the first end of the inner sleeve 62 (the lower end of the inner sleeve 62 in fig. 4) to the second end of the inner sleeve 62 (the upper end of the inner sleeve 62 in fig. 4).
It will be understood by those skilled in the art that the foregoing diameter and density characteristics of the damping hole 321 enable damping fluid to flow rapidly between the annular cavity 611 and the cylindrical cavity 612 when the damper 6 is just compressed (or compressed by a small amount), so that the damper 6 generates a small damping force, and can respond rapidly and sensitively to absorb slight vibration of the protection bearing 5; and when the damper 6 is compressed by a large amount, the damping liquid can slowly flow between the annular cavity 611 and the cylindrical cavity 612, so that the damper 6 generates a large damping force to absorb the strong vibration of the protection bearing 5, and the vibration of the protection bearing 5 is absorbed as much as possible.
With continued reference to fig. 4, a piston 63 is slidably disposed within the inner sleeve 62; the piston rod 64 is fixedly connected with the piston 63; one end of the spring 65 abuts against the piston 63, and the other end of the spring 65 abuts against the outer sleeve 61, or one skilled in the art may abut against the other end of the spring 65 against the inner sleeve 62 as necessary.
With continued reference to fig. 4, the roller 66 is disposed at an end of the piston rod 64 remote from the inner piston 632 such that the damper 6 is in rolling contact with the protection bearing 5 through the roller 66. When the rotating shaft 2 rotating at a high speed contacts the protective bearing 5 and thus rotates the outer ring of the protective bearing 5, the roller 66 can reduce the frictional resistance between the protective bearing 5 and the damper 6, preventing the damper 6 from being damaged by the friction of the protective bearing 5.
Based on the foregoing description, it can be understood by those skilled in the art that when the magnetic force provided by the radial magnetic suspension bearing 3 to the rotating shaft 2 is not enough to support the rotating shaft 2 to suspend, the rotating shaft 2 may collide with the protection bearing 5, so that the protection bearing 5 is displaced correspondingly with the collision of the rotating shaft 2, and thus the damper 6 is compressed, and the damper 6 absorbs the shock generated by the protection bearing 5, thereby effectively protecting the protection bearing 5 and prolonging the service life of the protection bearing 5.
Furthermore, although not shown in the figures, the utility model also provides a magnetically levitated centrifugal compressor comprising a centrifugal compressor and a magnetically levitated motor as described hereinbefore. The centrifugal compressor comprises a shell and an impeller arranged in the shell, wherein the shell is fixedly connected with a shell 1 of the magnetic suspension motor, and the impeller is coaxially and fixedly connected with a rotating shaft 2 of the magnetic suspension motor.
Furthermore, the magnetic suspension motor and the magnetic suspension centrifugal compressor can be applied to refrigerating and heating equipment such as refrigerators, freezers, air conditioners and the like.
So far, the technical solution of the present invention has been described in connection with the foregoing embodiments, but it is easily understood by those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Without departing from the technical principle of the present invention, a person skilled in the art may split and combine the technical solutions in the above embodiments, and may make equivalent changes or substitutions for related technical features, and any changes, equivalents, improvements, etc. made within the technical concept and/or technical principle of the present invention will fall within the protection scope of the present invention.
Claims (10)
1. A magnetically levitated motor, comprising:
a housing;
a rotating shaft provided with a push disk extending outward in a radial direction thereof;
the radial magnetic suspension bearing is fixedly connected with the machine shell and is arranged between the machine shell and the rotating shaft along the radial direction of the rotating shaft;
the axial thrust bearing is fixedly connected with the shell and is arranged between the shell and the push disc along the axial direction of the rotating shaft;
a first annular gap is formed between the protection bearing and the shell, and a second annular gap is formed between the protection bearing and the rotating shaft;
a plurality of dampers disposed between the housing and the protective bearing.
2. Magnetic levitation motor according to claim 1,
the damper is a rod type damper which can stretch along the self axial direction; and/or the like and/or,
the number of the dampers is even; and/or the like and/or,
the plurality of dampers are distributed at equal intervals along the circumferential direction of the protection bearing.
3. Magnetic levitation motor according to claim 2,
the damper includes:
an outer sleeve;
the inner sleeve is arranged in the outer sleeve and divides the inner space of the outer sleeve into an annular cavity and a cylindrical cavity, and a plurality of damping holes distributed along the axial direction of the inner sleeve are formed in the side wall of the inner sleeve;
a piston slidably disposed within the inner sleeve;
the piston rod is fixedly connected with the piston;
one end of the spring is abutted with the piston, and the other end of the spring is abutted with the outer sleeve or the inner sleeve;
a damping fluid filled in the outer sleeve and capable of flowing between the annular chamber and the cylindrical chamber through the damping hole.
4. Magnetic levitation motor according to claim 3,
the diameter of the orifice increases in order from the first end of the inner sleeve to the second end of the inner sleeve.
5. Magnetic levitation motor according to claim 3,
the distribution density of the damping holes on the inner sleeve is increased from the first end of the inner sleeve to the second end of the inner sleeve in sequence.
6. Magnetic levitation motor according to any of claims 2-5,
the casing is provided with a plurality of mounting holes pointing to the rotating shaft, and the damper is inserted into the mounting holes and abutted against the protective bearing.
7. Magnetic levitation motor according to claim 6,
at least one part of the mounting hole is a threaded hole;
the magnetic levitation motor further includes a screw member screwed into the screw hole and abutting against the damper.
8. Magnetic levitation motor according to any of claims 1-5,
and one end of the damper, which is close to the protective bearing, is provided with a roller, so that the damper is in rolling contact with the protective bearing through the roller.
9. Magnetic levitation motor according to any of claims 1-5,
the protective bearing is a ball bearing.
10. A magnetically levitated centrifugal compressor comprising a magnetically levitated motor according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122338869.5U CN216216330U (en) | 2021-09-26 | 2021-09-26 | Magnetic suspension motor and magnetic suspension centrifugal compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122338869.5U CN216216330U (en) | 2021-09-26 | 2021-09-26 | Magnetic suspension motor and magnetic suspension centrifugal compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216216330U true CN216216330U (en) | 2022-04-05 |
Family
ID=80922702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122338869.5U Active CN216216330U (en) | 2021-09-26 | 2021-09-26 | Magnetic suspension motor and magnetic suspension centrifugal compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216216330U (en) |
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2021
- 2021-09-26 CN CN202122338869.5U patent/CN216216330U/en active Active
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