CN108512343B - Permanent magnet motor and submersible pump - Google Patents
Permanent magnet motor and submersible pump Download PDFInfo
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- CN108512343B CN108512343B CN201810617996.9A CN201810617996A CN108512343B CN 108512343 B CN108512343 B CN 108512343B CN 201810617996 A CN201810617996 A CN 201810617996A CN 108512343 B CN108512343 B CN 108512343B
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- 239000007788 liquid Substances 0.000 claims abstract description 123
- 230000003014 reinforcing effect Effects 0.000 claims description 22
- 238000004026 adhesive bonding Methods 0.000 claims description 4
- 229920000049 Carbon (fiber) Polymers 0.000 description 23
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 22
- 229910000831 Steel Inorganic materials 0.000 description 18
- 239000010959 steel Substances 0.000 description 18
- 230000001681 protective effect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000005484 gravity Effects 0.000 description 5
- 229910000975 Carbon steel Inorganic materials 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
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- 239000000835 fiber Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000010962 carbon steel Substances 0.000 description 3
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- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
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- 238000003754 machining Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
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- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/132—Submersible electric motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The application relates to the technical field of submersible pumps, in particular to a permanent magnet motor and a submersible pump. The permanent magnet motor comprises a shell, a shielding sleeve, a first bearing seat and a second bearing seat; the first bearing seat is connected to the first end of the shell through the first screen board, and the second bearing seat is connected to the second end of the shell through the second screen board; the first bearing seat and the rotor shaft form a first cavity; air is arranged in the first cavity; when the first cavity is immersed in the liquid, the liquid level is increased to compress air until the pressure of the air is the same as that of the liquid, and at the moment, the liquid level of the liquid is below the first bearing; the outer side of the rotor shaft is provided with a permanent magnet. The submersible pump includes a permanent magnet motor. The application provides a permanent magnet motor and a submersible pump, which are used for preventing a bearing, a rotor core and a motor stator in the motor from being contacted with liquid.
Description
Technical Field
The application relates to the technical field of submersible pumps, in particular to a permanent magnet motor and a submersible pump.
Background
The submersible pump is also called a submerged pump, and is a pump which works in potential water (under the liquid). The submerged pump is an important device for urban sewage discharge, sewage treatment, road and bridge engineering drainage, irrigation and drainage in hydraulic engineering, etc. With the perfection of national environmental regulations and the enhancement of environmental awareness of people, submersible pumps for sewage treatment are increasingly demanded and applied. The submersible pump is immersed into sewage with various water qualities for a long time to run, and the working environment is bad.
The prior art submersible pumps consist of an electric motor that operates under a liquid, while the entire rotor of the motor is immersed in the liquid. Wherein, when the motor rotor is immersed in the liquid, three parts are not contacted with the liquid: the first part is the bearing part, which involves lubrication and bearing life; the second part is a rotor core part, namely a permanent magnet part, and the permanent magnet is easy to lose magnetism due to the extremely bad working environment of the permanent magnet immersed in the liquid; the third part is the motor stator, which needs to be protected from liquid corrosion.
Accordingly, the present application addresses the above-described problems by providing a new permanent magnet motor and submersible pump.
Disclosure of Invention
The object of the present application is to provide a permanent magnet motor to avoid the contact of the bearings, rotor core and motor stator with liquid in the motor.
It is also an object of the present application to provide a submersible pump to further avoid contact of the bearings, rotor core and motor stator with liquid in the motor.
Based on the first object, the present application provides a permanent magnet motor, comprising a housing, a rotor assembly, a shielding sleeve, a first bearing seat, a second bearing seat, a first screen board and a second screen board;
the rotor assembly includes a rotor shaft and a permanent magnet;
the shell is of a vertical structure, and comprises a first end and a second end which are corresponding to each other along the height direction of the shell, wherein the first end is positioned above the second end;
the first bearing seat is connected to the first end of the shell through the first screen board, the second bearing seat is connected to the second end of the shell through the second screen board, and a cavity is formed among the shell, the first bearing seat, the second bearing seat, the first screen board and the second screen board;
the shielding sleeve is sleeved in the cavity and divides the cavity into a stator cavity and a rotor cavity which are not communicated with each other;
wherein the first screen plate, the inner wall of the shell, the outer wall of the shielding sleeve and the second screen plate form the stator cavity, and the stator cavity is a sealed cavity; the rotor cavity is formed among the first bearing seat, the inner wall of the shielding sleeve and the second bearing seat;
the shielding sleeve can transmit a magnetic field;
the rotor shaft is arranged in the shell, the rotor shaft is arranged in the shielding sleeve, one side of the rotor shaft, which is close to the first end, is connected with the first bearing seat through a first bearing, and one side of the rotor shaft, which is close to the second end, is connected with the second bearing seat through a second bearing;
a first cavity is formed between the first bearing seat and the rotor shaft, and the first bearing is positioned in the first cavity;
air is arranged in the first cavity;
when one side of the first cavity, which is close to the second end, is immersed in liquid, the liquid level of the liquid rises, and the air is compressed in the direction close to the first end until the pressure of the air is the same as that of the liquid, and at the moment, the liquid level of the liquid is below the first bearing;
the permanent magnets are arranged on the outer side of the rotor shaft.
In any of the above technical solutions, further, the permanent magnet motor of the present application further includes a first reinforcing ring; the first reinforcing ring is arranged at the first end of the shell, and is arranged between the first bearing seat and the shielding sleeve and used for supporting the shielding sleeve;
and/or, further comprising a second stiffening ring; the second reinforcing ring is arranged at the second end of the shell, and is arranged between the second bearing seat and the shielding sleeve and used for supporting the shielding sleeve.
In any of the above technical solutions, further, a second cavity is formed between the second bearing and the rotor shaft, and the second bearing is located in the second cavity;
air is arranged in the second cavity;
when one side of the second cavity, which is close to the second end, is immersed in the liquid, the liquid level of the liquid rises, and the air is compressed in the direction close to the first end until the pressure of the air is the same as that of the liquid, and at this time, the liquid level of the liquid is below the second bearing.
In any of the above technical solutions, further, the permanent magnet motor of the present application further includes a first bearing bracket; the first bearing is positioned with the shaft shoulder of the rotor shaft through the first bearing bracket; the first cavity is formed among the first bearing seat, the first bearing bracket and the shaft shoulder of the rotor shaft;
and/or, further comprising a second bearing bracket; the second bearing is positioned with the rotor shaft by the second bearing bracket near the shaft shoulder of the second end; the second cavity is formed among the second bearing bracket, the second bearing bracket and the shaft shoulder of the rotor shaft.
In any of the above technical solutions, further, in the present application, the first bearing is located at a side of the first cavity near the first end;
and/or the second bearing is positioned at one side of the second cavity close to the first end.
In any of the above technical solutions, further, the permanent magnet motor of the present application further includes a rotor balancing structure;
the rotor balancing structure comprises a balancing disc and a balancing plane Heng Zhu;
the balance disc is provided with a balance cavity, and the balance cavity penetrates through the balance disc along the extending direction of the balance cavity;
the rotor shaft is sleeved in the balance cavity and fixedly connected with the balance disc;
the balancing disc is provided with a column hole matched with the balancing column, and the axis direction of the column hole is offset relative to the axis direction of the balancing cavity;
the balance column is inserted into the column hole.
In any of the above technical solutions, further, in the present application, an axial direction of the pillar hole is parallel to an extending direction of the balance cavity.
In any of the above technical solutions, in the present application, there are a plurality of the post holes, and the plurality of post holes are arranged at intervals along the circumferential direction of the balancing disk.
In any of the above technical solutions, further, the balance post and the post hole of the present application are in clearance fit;
the balance column and the column hole are connected in a gluing or riveting mode.
Based on the second object, the application provides a submersible pump comprising the permanent magnet motor.
By adopting the technical scheme, the application has the following beneficial effects:
the first cavity is internally provided with air, when the submersible pump is arranged in liquid, liquid enters the submersible pump, meanwhile, one side, close to the second end, of the first cavity enters the first cavity, the liquid level of the liquid in the first cavity continuously rises along with deepening of the depth of the submersible pump immersed in the liquid, the liquid compresses the air towards the direction close to the first end, the pressure of the air on the liquid increases along with the air volume compressed until the pressure of the air is the same as the pressure of the liquid, at the moment, the liquid level of the liquid does not rise any more, and at the moment, the liquid level of the liquid is located below the first bearing so as to ensure that the first bearing cannot be contacted with the liquid, and the submersible pump can reliably work under the liquid. In summary, the first bearing is protected in air by using the pressure balance principle, so that the first bearing cannot be contacted with liquid, the reliability is improved, and the installation is convenient. In summary, avoiding contact of the first bearing and the rotor core with the liquid in the motor is achieved.
The stator cavity is used for accommodating a stator. When the motor works, the motor is immersed into liquid such as water and the like to run, the rotor cavity is immersed into the liquid, and the shielding sleeve divides the cavity into a stator cavity and a rotor cavity which are not communicated with each other, so that the liquid in the rotor cavity cannot enter the stator cavity; the first screen board, the inner wall of casing, the second screen board with the outer wall of shielding cover forms the stator chamber, just the stator chamber is sealed cavity, consequently, the stator chamber also can not be from other positions immersion liquid, makes the stator chamber form the dry-type cavity of no liquid, forms quiet seal to the stator to the protection stator is corroded, the pollution by liquid, prevents the stator. It should be noted that, since the shielding sleeve can transmit the magnetic field, the normal operation of the stator and the rotor is not affected. In summary, it is achieved that the bearings, the rotor core and the motor stator in the motor are prevented from being in contact with the liquid.
The submersible pump provided by the application comprises the permanent magnet motor, and further avoids the contact of a bearing, a rotor core and a motor stator in the motor with liquid.
Additional aspects and advantages of the application will be set forth in part in the description which follows, or may be learned by practice of the application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a permanent magnet motor according to an embodiment of the present application;
fig. 2 is a partial enlarged view of a portion a of the permanent magnet motor shown in fig. 1;
fig. 3 is a partial enlarged view of a portion B of the permanent magnet motor shown in fig. 1;
fig. 4 is a partial enlarged view of a portion C of the permanent magnet motor shown in fig. 1;
fig. 5 is a schematic structural diagram of a permanent magnet motor in an application process according to an embodiment of the present application.
Icon: 1-a shell; 21-a rotor shaft; 22-permanent magnets; 231-a first carbon fiber layer; 232-a steel wire layer; 233-a second carbon fiber layer; 24-stator; 31-a first bearing seat; 32-a second bearing block; 41-a first bearing; 42-a second bearing; 51-a shielding sleeve; 52-a first panel; 53-a second panel; 61-a first cavity; 62-a second cavity; 71-a first bearing support; 72-a second bearing support; 81-balancing discs; 82-balancing columns; 9-a second stiffening ring.
Detailed Description
The following description of the embodiments of the present application will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the application are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. 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.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1 to 5, the present embodiment provides a permanent magnet motor including a housing 1, a rotor assembly, a shield case 51, a first bearing housing 31, a second bearing housing 32, a first screen 52, and a second screen 53;
the rotor assembly comprises a rotor shaft 21 and permanent magnets 22;
the shell is of a vertical structure, and comprises a first end and a second end which are corresponding to each other along the height direction of the shell, wherein the first end is positioned above the second end;
the first bearing seat 31 is connected to the first end of the casing through the first screen plate 52, the second bearing seat 32 is connected to the second end of the casing through the second screen plate 53, and a cavity is formed among the casing, the first bearing seat, the second bearing seat, the first screen plate and the second screen plate;
the shielding sleeve 51 is sleeved in the cavity and divides the cavity into a stator cavity and a rotor cavity which are not communicated with each other;
wherein the first screen plate, the inner wall of the shell, the outer wall of the shielding sleeve and the second screen plate form the stator cavity, and the stator cavity is a sealed cavity; the rotor cavity is formed among the first bearing seat, the inner wall of the shielding sleeve and the second bearing seat;
the shielding sleeve can transmit a magnetic field;
the rotor shaft 21 is arranged in the casing, the rotor shaft 21 is arranged in the shielding sleeve 51, one side of the rotor shaft 21, which is close to the first end, is connected with the first bearing seat 31 through a first bearing 41, and one side of the rotor shaft 21, which is close to the second end, is connected with the second bearing seat 32 through a second bearing 42;
a first cavity 61 is formed between the first bearing seat 31 and the rotor shaft 21, and the first bearing 41 is located in the first cavity 61;
air is arranged in the first cavity 61;
when one side of the first cavity, which is close to the second end, is immersed in liquid, the liquid level of the liquid rises, and the air is compressed in the direction close to the first end until the pressure of the air is the same as that of the liquid, and at the moment, the liquid level of the liquid is below the first bearing;
the permanent magnets 22 are provided outside the rotor shaft 21.
The housing is a vertical housing, i.e. the axial direction of the housing is vertical.
The first cavity is internally provided with air, when the submersible pump is arranged in liquid, liquid enters the submersible pump, meanwhile, one side, close to the second end, of the first cavity enters the first cavity, the liquid level of the liquid in the first cavity continuously rises along with deepening of the depth of the submersible pump immersed in the liquid, the liquid compresses the air towards the direction close to the first end, the pressure of the air on the liquid increases along with the air volume compressed until the pressure of the air is the same as the pressure of the liquid, at the moment, the liquid level of the liquid does not rise any more, and at the moment, the liquid level of the liquid is located below the first bearing so as to ensure that the first bearing cannot be contacted with the liquid, and the submersible pump can reliably work under the liquid. In summary, the first bearing is protected in air by using the pressure balance principle, so that the first bearing cannot be contacted with liquid, the reliability is improved, and the installation is convenient.
In summary, avoiding contact of the first bearing and the rotor core with the liquid in the motor is achieved.
The stator cavity is used for accommodating a stator. When the motor works, the motor is immersed into liquid such as water and the like to run, the rotor cavity is immersed into the liquid, and the shielding sleeve divides the cavity into a stator cavity and a rotor cavity which are not communicated with each other, so that the liquid in the rotor cavity cannot enter the stator cavity; the first screen board, the inner wall of casing, the second screen board with the outer wall of shielding cover forms the stator chamber, just the stator chamber is sealed cavity, consequently, the stator chamber also can not be from other positions immersion liquid, makes the stator chamber form the dry-type cavity of no liquid, forms quiet seal to the stator to the protection stator is corroded, the pollution by liquid, prevents the stator. It should be noted that, since the shielding sleeve can transmit the magnetic field, the normal operation of the stator and the rotor is not affected.
In summary, it is achieved that the bearings, the rotor core and the motor stator in the motor are prevented from being in contact with the liquid.
Preferably, the protective sleeve is further included;
the protective sleeve comprises a first carbon fiber layer 231, a second carbon fiber layer 233 and a steel wire layer 232; the steel wire layer 232 is disposed on a side of the permanent magnet 22 away from the axis of the rotor shaft 21, and the first carbon fiber layer 231 is disposed between the permanent magnet 22 and the steel wire layer 232; the second carbon fiber layer 233 is disposed on a side of the steel wire layer 232 away from the first carbon fiber layer 231;
and one side, far away from the steel wire layer, of the second carbon fiber layer and the rotor shaft are coated with waterproof materials.
In addition, including setting up in the first carbon fiber layer in the permanent magnet outside through the protective sheath, first carbon fiber layer protection permanent magnet, the steel wire layer plays the effect that switches on the higher harmonic, and the protective sheath is favorable to the heat dissipation of rotor, is favorable to eliminating the influence of higher harmonic that the stator produced to the rotor. And one side, far away from the first carbon fiber layer, of the steel wire layer and the rotor shaft are coated with waterproof materials, so that the rotor assembly is prevented from being contacted with liquid in the waterproof coating.
The first carbon fiber layer and the second carbon fiber layer are made of carbon fiber materials, and the carbon fibers are novel fiber materials of high-strength and high-modulus fibers with carbon content of more than 95%. The microcrystalline graphite material is prepared by stacking organic fibers such as flaky graphite microcrystals along the axial direction of the fibers and performing carbonization and graphitization treatment. The carbon fiber is 'soft outside and rigid inside', has lighter mass than metal aluminum, has higher strength than steel, has the characteristics of corrosion resistance and high modulus, and is an important material in national defense and military industry and civil use. It not only has the inherent intrinsic characteristics of carbon materials, but also has the soft processability of textile fibers, and is a new generation of reinforcing fibers.
The carbon fiber has many excellent performances, high axial strength and modulus, low density, high specific performance, no creep deformation, ultrahigh temperature resistance under non-oxidation environment, good fatigue resistance, specific heat and conductivity between nonmetal and metal, small thermal expansion coefficient, anisotropy, good corrosion resistance and good X-ray permeability. Good electric and heat conductivity, good electromagnetic shielding performance, etc.
The steel wire layer is of a cylindrical structure formed by winding steel wires to form a spiral ring, and when the steel wires are wound, pulling force is applied to pull the steel wires, so that the tightness of the steel wires is ensured; the first carbon fiber layer, the second carbon fiber layer and the steel wire layer are alternately wound to form a protective sleeve, the first carbon fiber layer and the second carbon fiber layer play a role in protecting the permanent magnet, and the steel wire plays a role in conducting higher harmonics.
The carbon fiber layer and the steel wire layer can be wound outside the second carbon fiber layer again, so that the strength and the magnetic conductivity are ensured.
Preferably, referring to fig. 2, the permanent magnet motor according to the present embodiment further includes a first reinforcing ring; the first reinforcing ring is arranged at the first end of the shell, and is arranged between the first bearing seat and the shielding sleeve and used for supporting the shielding sleeve;
and/or further comprising a second reinforcing ring 9; the second reinforcing ring 9 is disposed at the second end of the casing 1, and disposed between the second bearing seat 32 and the shielding sleeve 51, for supporting the shielding sleeve 51.
Specifically, the first reinforcing ring is further included; the first reinforcing ring is arranged at the first end of the shell, is arranged between the first bearing seat and the shielding sleeve and is used for supporting the shielding sleeve.
Or, further comprising a second reinforcing ring; the second reinforcing ring is arranged at the second end of the shell, and is arranged between the second bearing seat and the shielding sleeve and used for supporting the shielding sleeve.
Or further comprising a first reinforcing ring; the first reinforcing ring is arranged at the first end of the shell, is arranged between the first bearing seat and the shielding sleeve and is used for supporting the shielding sleeve. And, further comprising a second reinforcing ring; the second reinforcing ring is arranged at the second end of the shell, and is arranged between the second bearing seat and the shielding sleeve and used for supporting the shielding sleeve.
Preferably, the first reinforcement ring is further included; the first reinforcing ring is arranged at the first end of the shell, is arranged between the first bearing seat and the shielding sleeve and is used for supporting the shielding sleeve. And, further comprising a second reinforcing ring; the second reinforcing ring is arranged at the second end of the shell, and is arranged between the second bearing seat and the shielding sleeve and used for supporting the shielding sleeve.
That is, the first bearing seat is sleeved in the shielding sleeve and is used for supporting one side, close to the first end, of the shielding sleeve, the first reinforcing ring is arranged between the first bearing seat and the shielding ring, the shielding sleeve is further supported, and the strength of the shielding sleeve is improved.
The second bearing seat is sleeved in the shielding sleeve and used for supporting one side, close to the second end, of the shielding sleeve, the second reinforcing ring is arranged between the second bearing seat and the shielding ring, the shielding sleeve is further supported, and the strength of the shielding sleeve is improved.
Preferably, the material of the shielding sleeve is metal. The shielding sleeve made of metal can transmit a magnetic field and can prevent corrosion.
Preferably, the shielding sleeve is in a thin-walled barrel shape and is formed by stamping.
Optionally, the casing comprises side walls which are sequentially connected end to end;
the side walls form the housing into a cylinder.
Referring to fig. 1, the permanent magnet motor according to the present embodiment further includes a stator 24;
in addition, the stator 24 of the present embodiment is disposed in the stator cavity and corresponds to the rotor shaft 21. Since the stator cavity and the rotor cavity are not communicated with each other, the stator and the rotor are separated, that is, the rotor is shielded by using the shielding sleeve, so that liquid in the rotor cavity is prevented from immersing into the stator cavity.
Preferably, the axial direction of the protective sleeve coincides with the axial direction of the rotor shaft, so that the structure is more reliable.
Alternatively, the protective sleeve outside the permanent magnet can have multiple layers, such as two layers, three layers, four layers, or the like.
Preferably, as shown in fig. 1, a second cavity 62 is formed between the second bearing 32 and the rotor shaft 21, and the second bearing 42 is located in the second cavity 62;
air is arranged in the second cavity 62;
when one side of the second cavity, which is close to the second end, is immersed in the liquid, the liquid level of the liquid rises, and the air is compressed in the direction close to the first end until the pressure of the air is the same as that of the liquid, and at this time, the liquid level of the liquid is below the second bearing.
Optionally, the first cavity is formed among the first bearing seat, one side of the rotor shaft close to the first end and a shaft shoulder of the rotor shaft;
a first gap is formed between one side of the first bearing seat far away from the first end and the shaft shoulder of the rotor shaft;
the first gap enables the first cavity to be communicated with the outside of the first bearing seat. Thereby immersing a side of the first cavity near the second end into the liquid and compressing air in the first cavity in a direction near the first end.
When one side of the second cavity, which is close to the second end, is immersed in the liquid, the liquid level of the liquid rises, and the air is compressed in the direction close to the first end until the pressure of the air is the same as that of the liquid, and at this time, the liquid level of the liquid is below the second bearing.
The second cavity is internally provided with air, when the submersible pump is arranged in the liquid, the liquid enters the submersible pump, meanwhile, one side, close to the second end, of the second cavity enters the second cavity, the liquid level of the liquid in the second cavity continuously rises along with deepening of the immersed depth of the submersible pump in the liquid, the air is compressed in the direction, close to the first end, of the liquid, the pressure of the air on the liquid increases along with the compressed air volume until the pressure of the air is the same as the pressure of the liquid, at the moment, the liquid level of the liquid does not rise any more, and at the moment, the liquid level of the liquid is located below the second bearing so as to ensure that the second bearing can not be contacted with the liquid, and the submersible pump can reliably work under the liquid.
In summary, the second bearing is protected in the air by using the pressure balance principle, so that the second bearing can not be contacted with the liquid, the structure of the submersible pump is further simplified, the reliability is improved, and the installation is convenient.
Preferably, referring to fig. 5, the permanent magnet motor according to the present embodiment further includes a first bearing bracket 71; the first bearing 41 is positioned with the shoulder of the rotor shaft 21 by the first bearing bracket 71; the first cavity is formed among the first bearing seat, the first bearing bracket and the shaft shoulder of the rotor shaft;
and/or further comprises a second bearing bracket 72; the second bearing 42 is positioned with the shoulder of the rotor shaft 21 adjacent the second end by the second bearing support 72; the second cavity is formed among the second bearing bracket, the second bearing bracket and the shaft shoulder of the rotor shaft.
Specifically, the first bearing bracket is also included; the first bearing is positioned with the shaft shoulder of the rotor shaft through the first bearing bracket; the first cavity is formed among the first bearing seat, the first bearing bracket and the shaft shoulder of the rotor shaft;
or, further comprising a second bearing bracket; the second bearing is positioned with the rotor shaft by the second bearing bracket near the shaft shoulder of the second end; the second cavity is formed among the second bearing bracket, the second bearing bracket and the shaft shoulder of the rotor shaft.
Or further comprising a first bearing support; the first bearing is positioned with the shaft shoulder of the rotor shaft through the first bearing bracket; the first cavity is formed among the first bearing seat, the first bearing bracket and the shaft shoulder of the rotor shaft; and, also include the second bearing bracket; the second bearing is positioned with the rotor shaft by the second bearing bracket near the shaft shoulder of the second end; the second cavity is formed among the second bearing bracket, the second bearing bracket and the shaft shoulder of the rotor shaft.
Preferably, the first bearing bracket is further included; the first bearing is positioned with the shaft shoulder of the rotor shaft through the first bearing bracket; the first cavity is formed among the first bearing seat, the first bearing bracket and the shaft shoulder of the rotor shaft; and, also include the second bearing bracket; the second bearing is positioned with the rotor shaft by the second bearing bracket near the shaft shoulder of the second end; the second cavity is formed among the second bearing bracket, the second bearing bracket and the shaft shoulder of the rotor shaft.
Preferably, referring to fig. 1, the first bearing is located at a side of the first cavity near the first end;
and/or the second bearing is positioned at one side of the second cavity close to the first end.
Specifically, the first bearing is located at one side of the first cavity near the first end;
alternatively, the second bearing is located on a side of the second cavity proximate the first end.
Or the first bearing is positioned on one side of the first cavity close to the first end; and the second bearing is positioned at one side of the second cavity close to the first end.
Preferably, the first bearing is located at a side of the first cavity near the first end; and the second bearing is positioned at one side of the second cavity close to the first end.
Thereby making the protection of the first bearing and the second bearing more reliable.
Preferably, referring to fig. 4, the permanent magnet motor according to the present embodiment further includes a rotor balancing structure;
the rotor balancing structure comprises a balancing disc 81 and a balancing column 82;
the balance disc 81 is provided with a balance cavity, and the balance cavity penetrates through the balance disc 81 along the extending direction of the balance cavity;
the rotor shaft 21 is sleeved in the balance cavity and is fixedly connected with the balance disc 81;
the balance disc 81 is provided with a column hole matched with the balance column, and the axis direction of the column hole is offset relative to the axis direction of the balance cavity;
the balance post 82 is inserted into the post hole.
It should be noted that, the axial direction of the column hole is offset relative to the axial direction of the balance cavity, namely: the axial direction of the column hole is parallel to and not coincident with the axial direction of the balance cavity, or an angle is formed between the axial direction of the column hole and the axial direction of the balance cavity.
In theory, the center of gravity of the rotor shaft of the motor is located on the axis of the rotating shaft, and in actual machining, the center of gravity of the rotor shaft deviates from the axis of the rotor shaft due to machining errors, so that unbalance occurs.
When the rotor balance structure provided by the embodiment is used, the motor rotor is sleeved in the balance cavity of the balance disc in a sleeved mode, and the rotating shaft is in interference fit with the balance disc, so that the balance disc rotates along with the rotor shaft when the rotor shaft rotates. When the rotor shaft is unbalanced, namely the center of gravity of the rotor shaft deviates from the axis of the rotor shaft, for example, the center of gravity of the rotor shaft deviates from the axis of the rotating shaft towards a first direction to generate vibration, a column hole of the balance disc is arranged in a second direction of the axis of the rotor shaft, and a balance column is inserted into the column hole to increase the weight of the rotor shaft in the second direction and balance the deviation of the center of the rotor shaft towards the first direction, so that dynamic balance of the motor rotor is realized, and the reduction of the reliability of the rotor caused by welding and turning is effectively avoided. Wherein the first direction and the second direction are opposite.
Optionally, the rotor balancing structure is disposed at two ends of the permanent magnet along the axial direction of the rotor shaft.
Preferably, the axial direction of the column hole is parallel to the extending direction of the balance cavity;
the column holes are multiple, and the column holes are arranged at intervals along the circumferential direction of the balance disc.
Thereby facilitating alignment of the position of the post hole according to the second direction so as to balance the deviation of the center of gravity of the rotation shaft.
Alternatively, the number of post holes is 2, 3, 4, 5, etc.
The more the number of the column holes is, the more accurate the balance column can be inserted into the column holes at the position close to the second direction, so that the balance of the rotating shaft is more stable and accurate.
Preferably, a plurality of the column holes are uniformly provided along the circumferential direction of the balance disc.
Optionally, the balance post and the post hole are in clearance fit;
the balance column and the column hole are connected in a gluing or riveting mode.
The balance column is in clearance fit with the column hole so as to facilitate fine adjustment of the position of the balance column in the column hole, thereby enabling the balance of the rotor to be more accurate.
It should be noted that, the balance post and the post hole may also be in interference fit.
Preferably, the balance column and the column hole are connected in a gluing or riveting mode, so that the connection strength of the balance column and the column hole is improved, and the phenomenon that the pin shaft flies out under the action of centrifugal force when the motor rotor rotates at a high speed is avoided.
Preferably, the materials of the balance disc and the balance column are carbon steel, stainless steel or alloy steel. Carbon steel mainly refers to steel having a mass fraction of carbon of less than 2.11% and containing no intentionally added alloying elements. Sometimes also called plain carbon steel or carbon steel, has high hardness, high strength and low cost.
The balance plate and the balance column may be made of other alloy materials such as stainless steel and alloy steel.
Example two
A second embodiment provides a submersible pump, where the submersible pump includes the permanent magnet motor described in the first embodiment, and technical features of the permanent magnet motor disclosed in the first embodiment are also applicable to the first embodiment, and technical features of the permanent magnet motor disclosed in the first embodiment are not repeated. Embodiments of the submersible pump are described in further detail below with reference to the accompanying drawings.
For economy of description, the improved features of this embodiment are also embodied in fig. 1-5, and therefore, the solution of this embodiment is described in connection with fig. 1-5.
Referring to fig. 1-5, the submersible pump provided in this embodiment includes the permanent magnet motor, and further avoids the contact of the bearing, the rotor core and the motor stator in the motor with liquid.
The submersible pump according to this embodiment has the advantages of the permanent magnet motor according to embodiment one, which have been described in detail in embodiment one and are not repeated here.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims below, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Claims (10)
1. The permanent magnet motor is characterized by comprising a shell, a rotor assembly, a shielding sleeve, a first bearing seat, a second bearing seat, a first screen board and a second screen board;
the rotor assembly includes a rotor shaft and a permanent magnet;
the shell is of a vertical structure, and comprises a first end and a second end which are corresponding to each other along the height direction of the shell, wherein the first end is positioned above the second end;
the first bearing seat is connected to the first end of the shell through the first screen board, the second bearing seat is connected to the second end of the shell through the second screen board, and a cavity is formed among the shell, the first bearing seat, the second bearing seat, the first screen board and the second screen board;
the shielding sleeve is sleeved in the cavity and divides the cavity into a stator cavity and a rotor cavity which are not communicated with each other;
wherein the first screen plate, the inner wall of the shell, the outer wall of the shielding sleeve and the second screen plate form the stator cavity, and the stator cavity is a sealed cavity; the rotor cavity is formed among the first bearing seat, the inner wall of the shielding sleeve and the second bearing seat;
the shielding sleeve can transmit a magnetic field;
the rotor shaft is arranged in the shell, the rotor shaft is arranged in the shielding sleeve, one side of the rotor shaft, which is close to the first end, is connected with the first bearing seat through a first bearing, and one side of the rotor shaft, which is close to the second end, is connected with the second bearing seat through a second bearing;
a first cavity is formed between the first bearing seat and the rotor shaft, and the first bearing is positioned in the first cavity;
air is arranged in the first cavity;
when one side of the first cavity, which is close to the second end, is immersed in liquid, the liquid level of the liquid rises, and the air is compressed in the direction close to the first end until the pressure of the air is the same as that of the liquid, and at the moment, the liquid level of the liquid is below the first bearing;
the permanent magnets are arranged on the outer side of the rotor shaft.
2. The permanent magnet motor of claim 1 further comprising a first stiffening ring; the first reinforcing ring is arranged at the first end of the shell, and is arranged between the first bearing seat and the shielding sleeve and used for supporting the shielding sleeve;
and/or, further comprising a second stiffening ring; the second reinforcing ring is arranged at the second end of the shell, and is arranged between the second bearing seat and the shielding sleeve and used for supporting the shielding sleeve.
3. The permanent magnet motor of claim 1 wherein a second cavity is formed between the second bearing mount and the rotor shaft, and the second bearing is located within the second cavity;
air is arranged in the second cavity;
when one side of the second cavity, which is close to the second end, is immersed in the liquid, the liquid level of the liquid rises, and the air is compressed in the direction close to the first end until the pressure of the air is the same as that of the liquid, and at this time, the liquid level of the liquid is below the second bearing.
4. A permanent magnet motor according to claim 3 further comprising a first bearing bracket; the first bearing is positioned with the shaft shoulder of the rotor shaft through the first bearing bracket; the first cavity is formed among the first bearing seat, the first bearing bracket and the shaft shoulder of the rotor shaft;
and/or, further comprising a second bearing bracket; the second bearing is positioned with the rotor shaft by the second bearing bracket near the shaft shoulder of the second end; the second cavity is formed among the second bearing bracket, the second bearing bracket and the shaft shoulder of the rotor shaft.
5. A permanent magnet motor according to claim 3 wherein the first bearing is located on a side of the first cavity adjacent the first end;
and/or the second bearing is positioned at one side of the second cavity close to the first end.
6. The permanent magnet motor of claim 1 further comprising a rotor balancing structure;
the rotor balancing structure comprises a balancing disc and a balancing plane Heng Zhu;
the balance disc is provided with a balance cavity, and the balance cavity penetrates through the balance disc along the extending direction of the balance cavity;
the rotor shaft is sleeved in the balance cavity and fixedly connected with the balance disc;
the balancing disc is provided with a column hole matched with the balancing column, and the axis direction of the column hole is offset relative to the axis direction of the balancing cavity;
the balance column is inserted into the column hole.
7. The permanent magnet motor according to claim 6, wherein an axial direction of the post hole is parallel to an extending direction of the balance cavity.
8. The permanent magnet motor of claim 7 wherein there are a plurality of the post holes and a plurality of the post holes are spaced circumferentially about the balance disc.
9. The permanent magnet motor of claim 8 wherein the balance post and the post hole are clearance fit;
the balance column and the column hole are connected in a gluing or riveting mode.
10. A submersible pump comprising a permanent magnet motor according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810617996.9A CN108512343B (en) | 2018-06-15 | 2018-06-15 | Permanent magnet motor and submersible pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810617996.9A CN108512343B (en) | 2018-06-15 | 2018-06-15 | Permanent magnet motor and submersible pump |
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| CN108512343A CN108512343A (en) | 2018-09-07 |
| CN108512343B true CN108512343B (en) | 2023-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810617996.9A Active CN108512343B (en) | 2018-06-15 | 2018-06-15 | Permanent magnet motor and submersible pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109474110B (en) * | 2018-12-05 | 2020-09-22 | 浙江西菱股份有限公司 | Motor for water pump |
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