CN103075350B - Structure improvement of permanent magnet canned pump - Google Patents

Structure improvement of permanent magnet canned pump Download PDF

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Publication number
CN103075350B
CN103075350B CN201110330019.9A CN201110330019A CN103075350B CN 103075350 B CN103075350 B CN 103075350B CN 201110330019 A CN201110330019 A CN 201110330019A CN 103075350 B CN103075350 B CN 103075350B
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China
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motor
bonnet
rotor
axle
impeller
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CN201110330019.9A
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CN103075350A (en
Inventor
简焕然
王锦城
施志贤
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Assoma Inc
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Assoma Inc
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Priority to CN201110330019.9A priority Critical patent/CN103075350B/en
Priority to CN201510099840.2A priority patent/CN104791257B/en
Publication of CN103075350A publication Critical patent/CN103075350A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/064—Details of the magnetic circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0088—Testing machines

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

The invention provides the structure improvement of a permanent magnet canned pump made of plastic or provided with a plastic liner. The rigidity improvement method comprises the following steps that a pumping rear cover axal hole base and a metal rear box axal supporting base axially enter into an internal diameter space of a motor rotor main yoke; the axal supporting base is closely combined with the axal hole base so as to increase the rigidity of a fixing shaft and shorten the length of a moment arm of loading force; the rear cover axal hole base is provided with a sensor according to requirements; the sensor is formed by a secondary magnet group and sensing components, and a close loop magnetic line is formed between the secondary magnet group and the sensing components; the secondary magnet group is arranged on the inner side of the main yoke of the motor rotor, is opposite to a main magnet group and is packaged with the motor rotor; the sensing components are formed by a secondary yoke and a sensing component; when the motor rotor rotates, the sensing component outputs a sensing voltage signal by cutting a magnetic line, and the sensing component is arranged in an annular groove of the rear cover axal hole base and is protected by the rear cover; and the sensing component can be a plurality of sensing coils, a plurality of Hall components and the like, and can be used for monitoring bearing abrasion or satisfying driving requirements.

Description

Permanent magnetism canning pump structure is improved
Technical field
Shaftless sealed cans armored pump is that motor and pumping are made of one, and its motor rotor and stator coil are all encapsulate isolated protection through resistant material, and be directly contact with conveying liquid, the drive motor of shaftless sealed cans armored pump can divide into induction motor, hereinafter referred to as the canned pump of induction, with permanent magnet motor, hereinafter referred to as permanent magnetism canning pump, many zero leakage demands industrial use be gradually user pay attention to, especially containing toxic, inflammable, the chemical liquids such as high corrosion, in addition, the rotor of shaftless sealed cans armored pump is that directly liquid is carried in contact, majority selects the ceramic material sliding bearing of abrasion performance, such as graphite, aluminium oxide, Carborundum etc., but bearing wear can cause rotor eccentricity to operate, fixed axle structure must bear higher centrifugal force and moment thereof, and cause rotor and sealed cans bonnet mutually to rub to damage and leakage failure, the structure of motor drive shaft system is made to become one of design focus, under the high-reliability demand of zero leakage, common method is installing bearing wear monitoring device.
Therefore, this creation is the permanent magnetism canning pump structure improvement of plastics or plastic inner lining, and the structural rigidity that object is promoting stationary axle also can install sensor, such as bearing wear monitoring device.
Background technique
Metal induction canned pump system is with extremely low magnetic conduction and the cylindric sealed cans of anti-corrosion sheetmetal encapsulate motor rotor and stator, sealed cans system is installed in diameter of stator bore face and is used for isolated liquid and stator coil, isolated liquid is also carried out with sheetmetal encapsulation in cage rotor surface, therefore the air gap of motor is by the monolateral radial distance of stator teeth silicon steel plate surface to rotor teeth portion silicon steel plate surface, total width of air gap majority is less than 3mm, and motor is characterized as small air gap motor configuration, also shaftless sealed cans armored pump purposes is needed at clean non-corrosiveness Liquid transfer, as car engine cooling waterpump, normal use is high temperature resistant but the heat resistant plastic material that corrosion resistance is restricted makes, as PPS, encapsulate motor stator and motor rotor, monolateral more than the 1.5mm of the corrosion-free nargin of its package thickness, total width of air gap, usually above more than 4mm, makes motor be characterized as high air gap motor configuration, meeting high toxicity, highly corrosive chemical liquid is carried, as hydrofluoric acid etc., must serviceability temperature more than 85 DEG C time low intensive corrosion-resistant plastic structural member or liner easily fall, as PP, the materials such as fluorine resin, encapsulate motor stator and motor rotor, due to the use of corrosion-resistant plastic material, the structural strength of motor drive shaft system is made to become one of design focus, and in motor rotor system, also therefore divide into rotatingshaft and stationary axle, this creation proposes preferred version for Fixed-axis system, because package thickness is containing monolateral more than the 3mm of corrosion allowance, total width of air gap is usually above more than 7mm, motor is made to be characterized as high air gap motor configuration, therefore, permanent magnet synchronous motor is the better selection of high air gap motor, although shaftless envelope canning pump has used ceramic material sliding bearing, but bearing still can because of bearing wear, anhydrous idle running, reasons such as too high vibrations and wearing and tearing, therefore, its reliability promoted by the sensor of installation monitoring bearing abrasion is necessary means, in addition, the sensor of this creation also can select Hall subassembly, makes the driving mode of permanent magnetism canning pump except sensorless drive, sensor also can have been used to drive, to reduce the convenience dependence of particular drive being contributed to the apolegamy of user's equipment,
Following case of quoting as proof is for the known solution of shaftless sealed cans armored pump, and comprise fixed axle structure, sensorless drive and have sensor to drive and the scheme such as bearing wear monitoring, the relevant case of quoting as proof of known techniques is described as follows:
Quote case one as proof:
The structure improvement of Taiwan Patent TWM369391 permanent magnetism canning pump in 2009, be applied to corrosion-and high-temp-resistant purposes, its motor configuration is cantilever fixed axle structure but motor is the design of radial air gap internal rotor, originally the package thickness of case is quoted as proof containing corrosion allowance, its monolateral thickness is the total width of air gap 8mm of 3mm, use sensing assembly method to calculate position of magnetic pole to drive permanent magnet motor, use rigid composite fixed axle structure to meet high temperature, high pass filter number purposes; But originally quote the structure bearing-free abrasion monitoring function of case as proof.
Quote case two as proof:
Japan Patent JP2005344589A-CANNED MOTOR PUMP in 2005, be applied to the permanent magnetism canning pump of engine cooling, originally to quote case as proof be small-power pumping is simple fixed axle structure, pottery magnetic axis is fixed by heat resistant plastice supports, containing tripod and pumping bonnet, secondary magnet and ear assembly is suddenly equiped with in the inner diameter volume in main magnet yoke portion, be used for detecting position of magnetic pole to drive permanent magnet motor, this suddenly ear assembly axially stretch out by bottom bonnet, and rotor magnet length also extends the axial elongation amount reducing independent ear assembly suddenly to axial; Clean liquid conveying need not be considered the load that bearing wear increases to use simple fixed axle structure, but increase magnet length can increase cost, and the magnetic line of force can only detecting magnet surface diffusion is unfavorable for that magnetic pole exact position is detected.
Quote case three as proof:
Japan Patent JP2008220008A--BRUSHLESS MOTOR AND FLUID PUMP DEVICE in 2008, be applied to the permanent magnetism canning pump of engine cooling, originally to quote case as proof be small-power pumping is simple fixed axle structure, pottery magnetic axis is fixed by heat resistant plastice supports, containing tripod and pumping bonnet, bottom back cover of motor, outer survey is equiped with Hall subassembly and driving circuit board thereof, be used for detecting position of magnetic pole to drive permanent magnet motor, magnet length axially lengthens and makes its tail end close to Hall subassembly, and magnet tail end is processed into inclined-plane, the oblique injection of magnetic power is made to detect precision through the installing assembly of ear suddenly on circuit boards to improve position of magnetic pole, clean liquid conveying need not be considered the load that bearing wear increases to use simple fixed axle structure, but increase magnet length can increase cost, and the magnetic line of force can only detecting the oblique diffusion of magnet surface is unfavorable for that magnetic pole exact position is detected.
Quote case four as proof:
US Patent No. 4211973A-Apparatus for detecting faults to beoccurred or initially existing in a running electric rotary machine in 1980, be applied to the canned pump of induction, the length of its inductor coil contains stator to amass thick total length, inductor coil can export periodically induced voltage, comprise and line lock main flux induced voltage and the rotor induced harmonics voltage caused by rotor slippage, the trace of size of gaps can be caused to change when bearing wear, this change also can be reflected on the induced voltage of coil output, when two at the coil of stator teeth fractional radial position, its output voltage values can only leave periodic harmonic voltage because subtracting each other, when bearing wear makes rotor generation eccentric operating, the value of periodic harmonic voltage can increase, be applicable to radial air gap induction motor and axial air-gap induction motor, this method also simultaneously can monitoring motor power issue or the problem of coil own, the problems such as such as three imbalances, but this case is only applicable to the radial bearing wear monitoring of induction motor, do not comprise axial thrust bearing abrasion monitoring.
Quote case five as proof:
1999 US Patent No. 5926001A-Canned motor bearing wear monitoring device, be applied to the canned pump of induction, its device respectively makes four in stator two end tooth portion internal side diameter space angle margin 90 to amount to two groups eight seam caves, make stator two end have eight independent teeth portion and can install inductor coil, there is identical space angle in stator two end corresponding seam cave, and eight groups of coils can sense the abrasion of bearing radial direction, axially abrasion and the functions such as abrasion that tilt;
Quote case six as proof:
1999 US Patent No. 5955880A-Sealless pump rotor position and bearingmonitor, be applied to the canned pump of induction, it is the high frequency excitation coil groups that the opposite polarity coil of use two and yoke form a group, this coil groups is fixed on sealed cans outer surface by yoke side by side, and be positioned at axial position outside stator two end, first its magnetic line of force of this coil groups can pass sealed cans and enter rotor two end outer space, and the permeability magnetic material of disk via rotor two side in rotating shaft, turned to by space again and get back to through sealed cans the airtight magnetic circuit that polarity opposite coil forms radial direction, namely permeability magnetic material and coil groups are concentric position relation, coil be with three lines and around a coil be used for high frequency excitation another two for inductor coil, one of this two-lines circle bar is used for making radial another coil of sensing as axial sensing, when monolateral bearing has radial abrasion, the radial position of disk can produce radial deflection, can make disk can closer to or leave coil groups, namely the magnetic resistance of magnetic circuit can change, namely the output voltage of coil groups can change, when same axial position be equiped with space angle each other 4 coil groups of 90 degree time, just can detect the radial direction abrasion of bearing, when rotor two side shaft end is all equiped with coil groups and disk, just can increase the detecting of axial displacement, axially the signal process of sensing utilizes the voltage signal of rotor two end-coil to compare, to calculate the axial displacement of rotor, in addition, 1K-4K high-frequency signals can avoid motor original coil harmonic wave signal to disturb, in addition, originally case is quoted as proof at stator coil tail end increase magnetic conduction isolation mounting for reducing humorous wave interference.
Quote case seven as proof:
US Patent No. 6114966A--Motor having a bearing wear monitoringdevice in 2000, be applied to the canned pump of induction, although originally quote case as proof to know that pointing out to install additional in the front end and back end of stator axis that plural inductor coil can reach detecting bearing really weares and teares, but motor maintenance may change stator, rotor, axle center and inductor coil, at this moment stator cannot be consistent with electric axially locating with the mechanical axially locating possibility of rotor, or inductor coil coiling is inconsistent again, the great exception of signal will be caused, namely detecting device must can adjust relative position and the signal that axially weares and teares is made zero, its method is exactly that rotor has slightly long compared with stator long-pending thick, must confirm relative to stator faces distance at shaft end side rotor end-face during assembling, rotor end-face alignment hub of a spool, rotor slightly the long-pending thick of length stretches out stator breech face, rotor tail end is contained coil completely and is had axial enough and to spare, rotor reach during current thrust bearing wearing and tearing, and coil signal variation in front end is more obvious, but the variation of the coil signal of tail end is lower,
Quote case eight as proof:
US Patent No. 6429781B2-Axial bearing wear detector device forcanned motor in 2002, be applied to the canned pump of induction, its device is one group of coil is that space angle 180 degree is corresponding, containing two coils of stator one teeth portion full width, one group of coil groups contains two coils of stator two ends teeth portion, although originally quote case as proof to know that pointing out to install additional in the front end and back end of stator axis that plural inductor coil can reach detecting bearing really weares and teares, but the axial length of wear ring is longer than the axial length of the front and back thrust bearing of rotor before and after motor, rotor can between the wear ring of front and back free axial displacement ± 2.5mm, bearing shaft must distinguish the normal axial displacement of rotor and abnormal abrasion displacement to abrasion detecting device, namely must really detect the actual abrasion loss of bearing, originally quoting case as proof uses a reference circuit and a dead point circuit to compare sensing coil signal respectively, no in normal range (NR) to distinguish rotor axial displacement.
Quote case nine as proof:
US Patent No. 7019661B2-Axial abrasion detector of bearing incanned motor in 2006, be applied to the canned pump of induction, use and quote the identical coil transduces method of case eight as proof, although originally quote case as proof to know that pointing out to install additional in the front end and back end of stator axis that plural inductor coil can reach detecting bearing really weares and teares, really attrition value can be obtained after signal zero, but inductor coil output voltage signal value usually can have migration phenomenon by the impact of motor running voltage, cause the difficulty of signal flyback action, namely bearing wear value is incorrect, this case proposes the method and apparatus of signal process, really signal can be made zero.
The comprehensive above canned pump of induction and permanent magnetism canning pump structure solution can be divided into following three kinds:
1, install sensor and increase pumping reliability with monitoring bearing;
2, install Hall subassembly drive pumping to facilitate but must magnet be lengthened;
3, improve stationary axle rigidity and increase pumping reliability.
The various problem proposed and solution thereof have its exploitativeness, but these schemes also cannot meet raising stationary axle, and rigidity can install again sensor to improve the demand of reliability, and the structure improvement of the permanent magnetism canning pump of this creation must overcome following problem simultaneously:
Problem 1: the intensity weakness of material itself
Improve structural rigidity enable avoid temperature more than 85 DEG C time corrosion-resistant plastic structural member or liner low intensive problem is easily fallen, also can increase pumping reliability without under sensor;
Problem 2: bearing wear monitoring requirements
Meet the demand for security of high toxicity, the conveying of highly corrosive chemical liquid, installing sensor can be used for continuing to monitor bearing wear state to promote pumping reliability;
Problem 3: the low cost demand of high air gap motor characteristic
Permanent magnet motor is the better selection of high air gap motor, but needs a large amount of magnet using costliness, and the length directly extending main magnet provides inductive component signal source, then magnet cost increases relatively;
Problem 4: the humorous wave interference avoiding the high-frequency PWM driving of permanent magnet motor.
The structure of sensor must can avoid the humorous wave interference of high-frequency PWM driving;
Problem 5: signal quality requirement during use sensor.
Larger axial free displacement space is had, the magnetic line of force of the sensor easier deviation of distribution and signal must avoid the difference because of supply voltage to cause the drift of signal at the rotor of the canned pump of highly corrosion resistant purposes;
Problem 6: easily carry out keeping in repair and renewal part
Maintain and replace part must can avoid the problem because location and other personal factor produce;
The structure improvement of this creation makes the permanent magnetism canning pump of various power range under reasonable cost, its stationary axle rigidity can be strengthened and can sensor be installed on demand, reach and promote reliability and the object increased the service life, be applicable to simple fixed axle structure and Relationship for Compound-Axis Structure.
Summary of the invention
Permanent magnetism canning pump structure improvement main purpose also can install sensor on demand in enhancement stationary axle rigidity, as bearing wear monitoring device and other sensor, to promote pumping reliability and other demand, when the application demand of high temperature, high corrosion processing procedure, solution is described as follows:
The permanent magnetism canning pump structure improvement structural rigidity that object is promoting stationary axle also can install sensor on demand, the inner diameter volume that the method that its stationary axle rigidity is promoted makes the after-frame axle supporting base of the Structural Hardware of motor after-frame axially stretch into the main yoke of motor rotor, and carry out isolated corrosive liquid by bonnet and boss thereof, axle supporting base boss of combining closely grips length to promote stationary axle rigidity with preferably axle, and the moment forces arm lengths of multi-load strength can be shortened, stationary axle rigidity is promoted will improve structural reliability, and bonnet boss has enough radial directions and axial space to install sensor, such as bearing wear monitoring device, promote pumping total reliability or other demand, the structure system of sensor is made up of secondary group of magnets and sensing component, and the sensing magnetic circuit system loop circuit magnetic line of force therebetween, secondary group of magnets quantity is equal with main magnet group but volume is less than 1/10th, encapsulate to avoid liquid to corrode together with rotor back to main magnet group inside the main yoke that secondary group of magnets system is installed on rotor, both main magnetic circuits magnetic line of force sensing magnetic circuit and main magnet is made to coexist in main yoke, namely the magnetic line of force of sensor is interference-free through main yoke, the length lengthening main yoke when using compared with long bearing to meet loading demand installs secondary group of magnets to facilitate, sensing component system is made up of secondary yoke and sensing component, when rotor rotates, sensing component exports induced voltage signal by cutting magnetic line, and protect by bonnet in the circular groove that sensing component is arranged on bonnet boss, sensing component can be plural inductor coil, plural number is ear assembly etc. suddenly, installing inductor coil be used for monitoring bearing wearing and tearing, install ear assembly suddenly and be then used for detecting magnetic pole to drive canned permanent magnet pump, make the driving mode of permanent magnetism canning pump except sensorless drive also, also sensor can be used to drive the convenience contributing to the apolegamy of user's equipment,
The axial length of the secondary magnet of sensor is at least more than two times of rotor axial displacement length (containing bearing shaft to abrasion), its magnetic line of force is penetrated by secondary magnet surface and arrives secondary yoke through air gap, get back to and other originally adjacent secondary magnet via secondary yoke again, and get back to original secondary magnet via main yoke and form airtight sensing magnetic circuit, sensing component system is sensing component, as inductor coil and ear assembly suddenly, be installed in secondary yoke surface and become an assembly through insulation material package, be installed in the circular groove bottom bonnet, this groove has an opening that sensing component can be installed by bonnet bottom outside, secondary yoke internal diameter and axle supporting base external diameter fit tightly fixing, and the trailing edge of secondary yoke is provided with an electrical angle locating point, this locating point system links the axle center locating point of the axle supporting base of motor after-frame, and link the electrical angle locating point of motor stator coils winding,
Use the sensing component of inductor coil, each inductor coil becomes in circumferential width system with secondary magnet number of poles but is all not more than 180 degree of electrical angles, each inductor coil cutting magnetic line under certain rotating speed can export induced voltage signal, plural number inductor coil can be divided into the two coil group of electrical angle difference 90 degree, its arrangement mode of the inductor coil of each coil groups have living space angle each other 180 degree simultaneously have again axial context, the signal of plural number inductor coil can calculate rotor speed through computing, axle center eccentric angle, axial position and radial position, axle center eccentric angle can provide the details of the movement locus of rotor axis, comparison rotor-position can obtain the abrasion loss of radial bearing and thrust bearing, or send abrasion alert news or stop the running of permanent magnetism canning pump, the output voltage of inductor coil will reduce with rotating speed and reduce its output voltage, therefore the purposes of rated speed less than 40% is not suitable for, such as rated speed is 3000rpm,
This creation provides optimum scheme to meet user's demand for the problems referred to above completely, and its novelty is described as follows:
Countermeasure 1: the permanent magnetism canning pump structure improvement structural rigidity that object is promoting stationary axle also can install sensor on demand, its stationary axle rigidity method of promoting axially stretches into the inner diameter volume of the main yoke of motor rotor and carrys out isolated corrosive liquid by the boss of bonnet making the after-frame axle supporting base of the Structural Hardware of motor after-frame, axle supporting base combines closely boss with longer axle gripping length to promote stationary axle rigidity, and the moment forces arm lengths of multi-load strength can be shortened, stationary axle rigidity is promoted will improve structural reliability.
Countermeasure 2: the inner diameter volume of main yoke makes bonnet boss can have the space of installing sensor, such as bearing wear monitoring device, promote pumping reliability, the structure system of sensor is made up of secondary group of magnets and sensing component, and have the loop circuit magnetic line of force to exist therebetween, encapsulate to avoid liquid to corrode together with rotor back to main magnet group inside the main yoke that secondary group of magnets system is installed on rotor, sensing component system is made up of secondary yoke and sensing component, and protect by bonnet in the circular groove that sensing component is arranged on bonnet boss, sensing component can be plural inductor coil be used for monitoring bearing wearing and tearing.
Countermeasure 3: the sensor of the inner diameter volume of main yoke comprises secondary group of magnets and sensing component; secondary group of magnets only has main magnet volume less than 1/10th; magnet cost can be reduced than directly lengthening main magnet length; in addition; often can use comparatively long bearing under the high capacity, the length that at this moment fitted bearing length increases main yoke just can install secondary group of magnets.
Countermeasure 4: the main magnetic circuit institute conducting that the magnetic line of force that the high-frequency PWM driving power being input to stator coil by frequency variator produces and harmonic wave all will be made up of main yoke, the sensor of this creation is installed on main yoke inner diameter volume and will be subject to the protection of main yoke; The secondary group of magnets quantity of sensor is equal with main magnet group and back to main magnet group inside the main yoke being installed on rotor, make sensing magnetic circuit coexist in main yoke with the magnetic line of force both main magnetic circuit, and namely the magnetic line of force of sensor through main yoke but without interruption; Its magnetic line of force of sensing magnetic circuit is penetrated by secondary magnet surface and arrives secondary yoke through air gap, then gets back to and other originally adjacent secondary magnet via secondary yoke, and gets back to original secondary magnet via main yoke and form airtight magnetic circuit; When rotor rotates, sensing component exports induced voltage signal by cutting magnetic line, therefore voltage signal does not independently disturb by external voltage.
Countermeasure 5: independently the axial length of its annular secondary yoke of sensor is except containing the axial length of secondary magnet, more comprise rotor axial movable length, and the length contained needed for inductor coil axially-aligned, the axial length of each inductor coil is more than 60% of secondary magnet axial length, axial overall length after arrangement is greater than secondary magnet axial length and adds rotor axial free displacement length, namely sense magnetic circuit stablely mobile with rotor running not have deviation situation and can increase signal stability, do not disturb by outer power voltage, axially its cutting of tandem inductor coil magnetic line of force quantity and rotor axial displacement or wear away linear, its induced voltage of inductor coil and the radial displacement of radial 180 degree or wear away linear.
Countermeasure 6: the trailing edge of secondary yoke is provided with an electrical angle locating point, locating point directly over the axle center of the axle supporting base of this locating point system link motor after-frame, and link the electrical angle reference point of coil winding when motor stator is arranged on center, the sensing component that sensing component and yoke are packaged as a whole, easily and can guarantee during maintain and replace that electrical Location is correct.
This creation will with having structure and whether sensor installation be described further, but other design can reaching identical effect is not limited with the following example:
1, without the canned permanent magnet pump of sensor:
Sensorless drive device need be used to drive pumping;
(a) simple stationary axle: the general service being applicable to high-low power bearing-free abrasion misgivings, the bonnet boss axially stretched into and axle supporting base shorten the moment forces arm lengths of multi-load strength, and by axle supporting base boss of combining closely, stationary axle rigidity are improved.
(b) composite solid dead axle: the high power, high temperature, the low NPSHr purposes that are used in bearing-free abrasion misgivings, the bonnet boss axially stretched into and axle supporting base can shorten the moment forces arm lengths of multi-load strength, compression is tightly locked by the rounded nose of metal shaft and the compressing surface of axle supporting base by its Ceramic shaft sleeve system, and cantilevered axle rigidity is improved.
2, the canned permanent magnet pump of tool bearing wear monitoring:
Sensorless drive device need be used to drive pumping;
(a) simple stationary axle: be applicable to the general service that high-low power has bearing wear misgivings, the bonnet boss axially stretched into and axle supporting base shorten the moment forces arm lengths of multi-load strength, and by axle supporting base boss of combining closely, stationary axle rigidity are improved; Back to main magnet group inside the main yoke that the secondary group of magnets of sensor is installed on rotor, the sensing component of sensor is made up of secondary yoke and inductor coil, be arranged in the circular groove of bonnet boss, and be closely fixed on and axle supporting base be used for monitoring bearing wearing and tearing; Longer bearing can be used when heavy duty demand especially, suitably can increase main yoke length and coordinate secondary group of magnets is installed.
(b) composite solid dead axle: the high power being used in bearing wear misgivings, high temperature, low NPSHr purposes, the bonnet boss axially stretched into and axle supporting base can shorten the moment forces arm lengths of multi-load strength, compression is tightly locked by the rounded nose of metal shaft and the compressing surface of axle supporting base by its Ceramic shaft sleeve system, cantilevered axle rigidity is improved, back to main magnet group inside the main yoke that the secondary group of magnets of sensor is installed on rotor, the sensing component of sensor is made up of secondary yoke and inductor coil, be arranged in the circular groove of bonnet boss, and be closely fixed on and axle supporting base be used for monitoring bearing wearing and tearing, longer bearing can be used when heavy duty demand especially, suitably can increase main yoke length and coordinate secondary group of magnets is installed.
3, sensor construction:
The structure system of sensor is made up of secondary group of magnets and sensing component, back to main magnet group inside the main yoke that secondary group of magnets system is installed on rotor, sensing component system is made up of secondary yoke and plural inductor coil, monitoring bearing wearing and tearing are used in the circular groove being arranged on axially extended bonnet boss, at this moment the driver without sensor must be used to drive, when sensing component use simultaneously suddenly ear assembly and inductor coil time, the driver of sensor can also have been selected drive.
Accompanying drawing explanation
Fig. 1 (A): this creation permanent magnetism canning pump is the generalized section of the fixed axle structure without sensor bilateral support.
Fig. 1 (B): this creation permanent magnetism canning pump is for there being the generalized section of the bilateral support fixed axle structure of sensor.
Fig. 1 (C): this creation permanent magnetism canning pump is the generalized section of the monolateral supporting cantilever Relationship for Compound-Axis Structure without sensor.
Fig. 1 (D): this creation permanent magnetism canning pump is for there being the generalized section of the monolateral supporting cantilever Relationship for Compound-Axis Structure of sensor.
Fig. 1 (E): this creation permanent magnetism canning pump, for there being the bilateral support fixed axle structure of sensor, uses the generalized section of extension shaft bearing structure.
Fig. 2: this creates first embodiment's motor rotor and the integral generalized section of impeller.
Fig. 3 (A): the generalized section of the pumping bonnet of this creation bilateral support stationary axle.
Fig. 3 (B): the generalized section of the pumping bonnet of this creation cantilever stationary axle.
Fig. 4 (A): the axis of this creation bilateral support stationary axle grips the generalized section of length L.
Fig. 4 (B): the axis of this creation cantilever stationary axle grips the generalized section of length L.
Fig. 5 (A): the generalized section of this creation motor rotor and moment of torsion stressed at bilateral support stationary axle multi-load.
Fig. 5 (B): the generalized section of this creation motor rotor and moment of torsion stressed at side cantilever stationary axle multi-load.
Fig. 6 (A): the radial section schematic diagram of this creation motor bearing abrasion monitoring device.
Fig. 6 (B): the axial schematic diagram of section of this creation bearing wear monitoring device.
Fig. 6 (C): the monitoring device schematic diagram of the bearing wear of this creation use 8 inductor coils.
Fig. 6 (D): this creation bearing wear monitoring device 3D schematic diagram ().
Fig. 6 (E): this creation bearing wear monitoring device 3D schematic diagram (two).
Fig. 6 (F): the monitoring device schematic diagram of the bearing wear of this creation use 4 inductor coils.
Fig. 7: this creation permanent magnetism canning pump sensor is equiped with the schematic diagram of Hall subassembly.
Embodiment
First embodiment: without the permanent magnetism canning pump of sensor bilateral support fixed axle structure, Fig. 1 (A);
Refer to shown in Fig. 1 (A), the permanent magnetism canning pump 1 of the present embodiment is the fixed axle structure of the bilateral support without sensor, and major part includes: pump protecgulum 4, tripod 31, impeller 5, bonnet 41, stationary axle 3 and canned motor 8, wherein:
Pump protecgulum 4 is provided with an entrance 44, outlet 45 and a flow channel space 47, and be used for holding impeller 5, be provided with an entrance thrust ring 46 at entrance 44 place inside pump protecgulum 4, being used for is coupled with the impeller thrust bearing 53 of impeller 5 inlet side forms axial thrust bearing jointly;
Tripod 31 is be fixed on pump protecgulum 4 ingress, can axially across impeller hub bore 54, is used for supporting one end of stationary axle 3;
It is inner that impeller 5 is installed in pump protecgulum 4, tripod 31 can axially across impeller boss perforate 54, be used for supporting one end of stationary axle 3, impeller boss 52 is used for being combined with the axial extension part 76 of motor rotor 7, impeller 5 is integrally formed or the two mutually embeds and is combined into one with motor rotor 7;
Bonnet 41 is a cup-shaped shell construction, bottom have tool ring channel structures boss 413 and without any through hole, guarantee that bonnet 41 does not have and how to leak generation, the flange part 411 of its front end, in conjunction with the center flange 811 of pump protecgulum 4 and canned motor 8, is used for preventing the leakage of corrosion liquid, the cylindrical part 412 of bonnet 41 side passes the internal diameter of stator 83, therebetween be slip loose fit, and fit tightly with motor after-frame 82 bottom bonnet 41, when conveying fluid pressure is born in bonnet 41 internal capacity room space 415, the silicon steel plate of stator 83 is repeatedly long-pending can provide enough support strengths with motor after-frame 82, boss 413 is located at bonnet 41 bottom centre and axially inner side extends in main yoke 72 inner diameter volume, protrude for inner side and there is central shaft hole 413a (as Fig. 3 (A)), it is the structure of circular groove 413b (as Fig. 3 (A)) outside it, the outer rim of its axis hole 413a is equiped with thrust ring 414 (as Fig. 3 (A)), be used for being coupled into axial thrust bearing with the bearing 79 of rotor 7, the outer side surface of axis hole 413a is completely by axle supporting base 821a combine closely and the support of motor after-frame 82, and the internal diameter of the bump backward 823 of the bottom of axis hole 413a and motor after-frame 82 is completely closely sealed, and the length of bump 823 coordinates the depth H of axis hole 413a (as Fig. 3 (A)) can give the support of the high rigidity of stationary axle 3 completely, namely bonnet 41 itself only provides corrosion protection isolation features directly not provide stationary axle 3 rigid support,
Stationary axle 3 is bilateral support structure, be made up of the corrosion-resistant stupalith with abrasion performance, its front end by tripod 31 support with rear end by the boss 413 axially stretched out support fixing, the rotation that in the middle of stationary axle 3, part is coupled for supporting motor rotor 7 with bearing 79, and intermediate portion part length is to meet the length of bearing 79 to bear the composite force suffered by motor rotor 7, and the axis of reserved motor rotor 7 moves freely space, the circular groove 413b (as Fig. 3 (A)) of boss 413, completely by motor after-frame 82 axle supporting base 821a combine closely with support and provide axle to grip length L, and the problem that can overcome plastics material intensity Yin Wendu rising and reduce,
Canned motor 8 is made up of with motor rotor 7 stator 83, motor center 81, motor after-frame 82;
Stator 83 is fastening to be installed in motor center 81, it is wound with coil input PWM power supply can produce magnetic flux and be used for and motor rotor 7 magnetic field interaction effect, make motor rotor 7 produce moment of torsion and rotate and impeller 5 output stream merit, the coil of stator 83 avoids corrosion liquid by pumping bonnet 41 protection and corrodes;
Motor center 81 is used for tightly locking bonnet 41 flange part 411 and pump protecgulum 4 at the flange 811 of pumping side, to prevent the leakage of corrosion liquid, the rear flange of center 81 is used for tightly locking motor after-frame 82 to provide complete structure support force, makes the axle supporting base 821a on motor after-frame 82 can provide support force needed for stationary axle 3;
Motor after-frame 82 is tightly locked in the rear flange 811 of motor center 81 pumping side, makes the axle supporting base 821a on motor after-frame 82 can provide support force needed for stationary axle 3, and the power line of motor stator 83 coil 831 exports 822 by power cable and receives driving power;
Motor rotor 7 is the ring type structures be made up of with axial extension part 76 main magnet group 71, main yoke 72, and the annular rotor encapsulate 74 of a zero leakage seam is overmolding to by corrosion resistant engineering plastics, the intermediate hole of motor rotor 7 is equiped with bearing 79, impeller boss 52 is used for being combined with the axial extension part 76 of motor rotor 7, impeller 5 is integrally formed or the two mutually embeds and is combined into one with motor rotor 7;
When pumping operates, fluid flow direction 6 becomes the fluid with pressure after flowing through the runner of impeller 5, as flow direction 61, and exported by outlet 45, there is segment fluid flow simultaneously, as flow direction 62, dorsal part via impeller 5 enters the room space 415 of bonnet 41, and via outside motor rotor 7 with the gap of bonnet 41 internal diameter to bonnet 41 flows, again via the Clearance Flow of stationary axle 3 with bearing 79, finally flow through impeller hub bore 54, as flow direction 65, get back to impeller 5 entrance, the circulating of this fluid is used to provide ceramic bearing 79 and lubricates required and take away the heat that motor rotor 7 produces,
Second embodiment: without the permanent magnetism canning pump of the monolateral supporting cantilever Relationship for Compound-Axis Structure of sensor, Fig. 1 (C);
Refer to shown in Fig. 1 (C), the permanent magnetism canning pump of the present embodiment is the cantilever Relationship for Compound-Axis Structure of the monolateral support without sensor, and major part includes: pump protecgulum 4a, impeller 5a, bonnet 41a, stationary axle 3a and canned motor 8, wherein:
Pump protecgulum 4a is provided with an entrance 44, outlet 45 and a flow channel space 47, be used for holding impeller 5a, pump protecgulum 4a is metal casting pot body, criticize in it and be covered with coffin 4b in anticorrosive plastic, be provided with an entrance thrust ring 46 at entrance 44 place inside it, being used for is coupled with the impeller thrust bearing 53 of impeller 5a inlet side forms axial thrust bearing jointly;
It is inner that impeller 5a is installed in pump protecgulum 4a, impeller boss 52 is used for being combined with the axial extension part 76 of motor rotor 7, impeller 5a is integrally formed or the two mutually embeds and is combined into one with motor rotor 7, the perforate of impeller boss plate 55 central authorities of impeller hub bore 54a system one, be used for allowing circulating liquid reflux, as shown in flow direction 65, the runner that pump protecgulum 4a entrance 44 becomes a level and smooth flaring with the entrance of impeller 5a does not have other obstacle, and the shape of impeller boss plate 55 is also smooth surface, effectively can reduce flow rate of liquid to guarantee that pumping has good anti-cavitation (NPSHr) performance,
Bonnet 41a is a cup-shaped shell construction, and boss 418 structure of a perforate is arranged at bottom, and the flange part 411 of its front end, in conjunction with the center flange 811 of pump protecgulum 4a and canned motor 8, is used for preventing the leakage of corrosion liquid; The cylindrical part 412 of bonnet 41a side passes the internal diameter of stator 83, therebetween be slip loose fit, and fit tightly with motor after-frame 82 bottom bonnet 41a, when conveying fluid pressure is born in bonnet 41a internal capacity room space 415, the silicon steel plate of stator 83 is repeatedly long-pending can provide enough support strengths with motor after-frame 82; Boss 418 is located at bonnet 41a bottom centre and axially inner side extends in main yoke 72 inner diameter volume, protrude for inner side and there is center hole 418a (as Fig. 3 (B)), inward recess 418b (as Fig. 3 (B)) is relatively become outside it, the through hole at boss 418 center is used for installing stationary axle 3a, the sealing surface 418d of boss 418 seals by with axle sleeve 33 end face of O type ring and the axle supporting base 821c packing of motor after-frame 82, how to leak generation to guarantee that bonnet 41a does not have, present case is unkitted sensor cannot provide bearing wear monitoring function;
To be cantilever structure formed with motor after-frame 82 by corrosion-resistant Ceramic shaft sleeve 33 with abrasion performance, metal shaft 32, and jointly formed complete axle sealing system with bonnet 41a stationary axle 3a, one end of stationary axle 3a can obtain required support strength when being installed in the axle supporting base 821c of motor after-frame 82, wherein metal shaft 32 is through the center hole 332 (as Fig. 5 (B)) of Ceramic shaft sleeve 33, and the front-end face 333 (as Fig. 5 (B)) of Ceramic shaft sleeve 33 is pressed on the one end with rounded nose 321, the axis extension boss 418 of spiro tooth part 323 through bonnet 41a and the center through hole of axle supporting base 821c of metal shaft 32, and be tightly locked on motor after-frame 82a with nut, make Ceramic shaft sleeve 33 thrust ring portion 331 (as Fig. 5 (B)) be pressed on the end face of axle supporting base 821c, the rounded nose 321 (as Fig. 5 (B)) of metal shaft 32 is then with plastic, rubber-coating 322 (as Fig. 5 (B)), which is provided with O type ring to reach the anti-corrosion function of sealing, the thrust ring portion 331 (as Fig. 5 (B)) of Ceramic shaft sleeve 33 is used for being coupled mutually with bearing 79 forming liquid hydrodynamic thrust bearing, the end face of the end face of thrust ring portion 331 and the axle supporting base 821c of after-frame 82 tightly locks compression, the sealing surface 418d of the two middle also packing boss 418, and by thrust ring portion 331 end face seal with O type ring, how to leak generation to guarantee that bonnet 41a does not have, and form the combined type stationary axle 3a of a high rigidity,
Canned motor 8 is made up of with motor rotor 7 stator 83, motor center 81, motor after-frame 82;
Stator 83 is fastening to be installed in motor center 81, it is wound with coil input PWM power supply can produce magnetic flux and be used for and motor rotor 7 magnetic field interaction effect, make motor rotor 7 produce moment of torsion and rotarily drive impeller 5a output stream merit, the coil 831 of stator 83 avoids corrosion liquid by pumping bonnet 41a protection and corrodes;
Motor center 81 is used for tightly locking bonnet 41a flange part 411 and pump protecgulum 4a at the flange 811 of pumping side, to prevent the leakage of corrosion liquid, the rear flange 811 of motor center 81 is used for tightly locking motor after-frame 82 to provide complete structure support force, makes the axle supporting base 821c on motor after-frame 82 can provide support force needed for composite solid dead axle 3a;
Motor after-frame 82 is tightly locked in the rear flange 811 of motor center 81 pumping side, makes the axle supporting base 821c on motor after-frame 82 can provide support force needed for stationary axle 3a, and the power line of motor stator 83 coil 831 exports 822 by power cable and receives driving power;
Motor rotor 7 is the ring type structures be made up of with axial extension part 76 main magnet group 71, main yoke 72, and the annular rotor encapsulate 74 of a zero leakage seam is overmolding to by corrosion resistant engineering plastics, the intermediate hole of motor rotor 7 is equiped with bearing 79, impeller boss 52 is used for being combined with the axial extension part 76 of motor rotor 7, impeller 5a is integrally formed or the two mutually embeds and is combined into one with motor rotor 7;
When pumping operates, fluid flow direction 6 becomes the fluid with pressure after flowing through the runner of impeller 5a, as flow direction 61, and exported by outlet 45, there is segment fluid flow simultaneously, as flow direction 62, dorsal part via impeller 5a enters the room space 415 of bonnet 41a, and via outside motor rotor 7 with the gap of bonnet 41a internal diameter to bonnet 41a flows, again via the Clearance Flow of stationary axle 3a and bearing 79, finally flow through the impeller hub bore 54a of impeller boss plate 55 central authorities, as flow direction 65, get back to impeller 5 entrance, the circulating of this fluid is used to provide ceramic bearing 79 and lubricates required and take away the heat that motor rotor 7 produces,
3rd embodiment: the permanent magnetism canning pump having sensor bilateral support fixed axle structure, Fig. 1 (B), Fig. 1 (E);
Refer to shown in Fig. 1 (B), the permanent magnetism canning pump 1 of the present embodiment is for there being the fixed axle structure of sensor bilateral support, major part includes: pump protecgulum 4, tripod 31, impeller 5, bonnet 41, sensor 9, stationary axle 3 and canned motor 8, wherein:
Pump protecgulum 4 is provided with an entrance 44, outlet 45 and a flow channel space 47, and be used for holding impeller 5, be provided with an entrance thrust ring 46 at entrance 44 place inside pump protecgulum 4, being used for is coupled with the impeller thrust bearing 53 of impeller 5 inlet side forms axial thrust bearing jointly;
Tripod 31 is be fixed on pump protecgulum 4 ingress, can axially across impeller hub bore 54, is used for supporting one end of stationary axle 3;
It is inner that impeller 5 is installed in pump protecgulum 4, tripod 31 can axially across impeller hub bore 54, be used for supporting one end of stationary axle 3, impeller boss 52 is used for being combined with the axial extension part 76 of motor rotor 7, impeller 5 is integrally formed or the two mutually embeds and is combined into one with motor rotor 7;
Bonnet 41 is a cup-shaped shell construction, bottom have tool ring channel structures boss 413 and without any through hole, guarantee that bonnet 41 does not have and how to leak generation, the flange part 411 of its front end, in conjunction with the center flange 811 of pump protecgulum 4 and canned motor 8, is used for preventing the leakage of corrosion liquid, the cylindrical part of bonnet 41 side passes the internal diameter of stator 83, therebetween be slip loose fit, and fit tightly with motor after-frame 82 bottom bonnet 41, when conveying fluid pressure is born in bonnet 41 internal capacity room space 415, the silicon steel plate of stator 83 is repeatedly long-pending can provide enough support strengths with motor after-frame 82, boss 413 is located at bonnet 41 bottom centre and axially inner side extends in main yoke 72 inner diameter volume, protrude for inner side and there is central shaft hole 413a (as Fig. 3 (A)), it is the structure of circular groove 413b (as Fig. 3 (A)) outside it, the outer rim of its axis hole 413a is equiped with thrust ring 414 (as Fig. 3 (A)), be used for being coupled into axial thrust bearing with the bearing 79 of rotor 7, and the inside installing sensing component 93 of circular groove 413b is containing secondary yoke 91 (as Fig. 3 (A)) and plural inductor coil 92 (as Fig. 3 (A)), the outer wall of axis hole 413a combined closely by the axle supporting base 821b of motor after-frame 82 and secondary yoke 91 completely, and the internal diameter of the bump backward 823 of the bottom of axis hole 413a and motor after-frame 82 is completely closely sealed, and the length of bump 823 coordinates the depth H (as Fig. 3 (A)) of axis hole 413a completely, the support of the high rigidity of stationary axle 3 can be given, namely bonnet 41 itself only provides corrosion protection isolation features directly not provide stationary axle 3 rigid support,
Sensor 9 be arranged on axially extended bonnet boss 413 circular groove 413b (as Fig. 3 (A)) in be used for monitoring bearing 79 and wear and tear, its structure system is made up of secondary group of magnets 73 and sensing component 93, the quantity of secondary group of magnets 73 is identical with main magnet group 71, secondary group of magnets 73 is one end bottom bonnet 41 of main yoke 72 internal diameter of being installed on motor rotor 7 and back to main magnet group 71, the axial length of secondary magnet 73 is at least more than two times of rotor 7 axial displacement length (containing bearing shaft to abrasion), sensing component 93 is be made up of secondary yoke 91 (as Fig. 3 (A)) and plural inductor coil 92 (as Fig. 3 (A)), secondary yoke 91 is to aim at the center of secondary magnet 73 for benchmark, the axial length of secondary yoke 91 is divided into two sections, front and back, axial front and rear edge axially mobile front and back two segment limit that all can not exceed secondary yoke 91 of secondary magnet 73.
Stationary axle 3 is bilateral support structure, be made up of the corrosion-resistant stupalith with abrasion performance, its front end by tripod 31 support with rear end by the boss 413 axially stretched out support fixing, in the middle of stationary axle 3 part be coupled with bearing 79 for support the rotation of motor rotor 7 and intermediate portion part length to meet the length of bearing 79, and the axis of reserved motor rotor 7 moves freely space, the circular groove 413b of boss 413 is mutually combined closely by both the axle supporting base 821b of motor after-frame 82 and secondary yoke 91 completely and supports and provide axle to grip length L, and the problem that can overcome plastics material intensity Yin Wendu rising and reduce,
Canned motor 8 is made up of with motor rotor 7 stator 83, motor center 81, motor after-frame 82;
Stator 83 is fastening to be installed in motor center 81, it is wound with coil input PWM power supply can produce magnetic flux and be used for and motor rotor 7 magnetic field interaction effect, make motor rotor 7 produce moment of torsion and rotarily drive impeller 5 output stream merit, the coil of stator 83 avoids corrosion liquid by pumping bonnet 41 protection and corrodes;
Motor center 81 is used for tightly locking bonnet 41 flange part 411 and pump protecgulum 4 at the flange 811 of pumping side, to prevent the leakage of corrosion liquid, the rear flange of motor center 81 is used for tightly locking motor after-frame 82 to provide complete structure support force, makes the axle supporting base 821b on motor after-frame 82 can provide support force needed for stationary axle 3;
Motor after-frame 82 is tightly locked in the rear flange of center 81 pumping side, makes the axle supporting base 821b on motor after-frame 82 can provide support force needed for stationary axle 3, and the power line of motor stator 83 coil exports 822 by power cable and receives driving power;
Motor rotor 7 is the ring type structures be made up of with axial extension part 76 main magnet group 71, main yoke 72, secondary group of magnets 73, the quantity of secondary group of magnets 73 is identical with main magnet group 71, secondary group of magnets 73 is one end bottom bonnet 41 of main yoke 72 internal diameter of being installed on motor rotor 7 and back to main magnet group 71, the intermediate hole of motor rotor 7 is equiped with bearing 79, impeller boss 52 is used for being combined with the axial extension part 76 of motor rotor 7, impeller 5 is integrally formed or the two mutually embeds and is combined into one with motor rotor 7;
When pumping operates, fluid flow direction 6 becomes the fluid with pressure after flowing through the runner of impeller 5, as flow direction 61, and exported by outlet 45, there is segment fluid flow simultaneously, as flow direction 62, dorsal part via impeller 5 enters the room space 415 of bonnet 41, and via outside motor rotor 7 with the gap of bonnet 41 internal diameter to bonnet 41 flows, again via the Clearance Flow of stationary axle 3 with bearing 79, finally flow through impeller hub bore 54, as flow direction 65, get back to impeller 5 entrance, it is required and take away the heat that rotor produces that the circulating of this fluid is used to provide ceramic bearing lubrication,
Refer to shown in Fig. 1 (E), the permanent magnetism canning pump of the present embodiment is for there being the fixed axle structure of the bilateral support of sensor, major part includes: pump protecgulum 4, tripod 31, impeller 5, bonnet 41, sensor 9, stationary axle 3 and canned motor 8, when pump operation condition has special demands, such as high-lift, the length of bearing 79 can be suitable lengthening, therefore, pumping configuration design suitably can increase the length that main yoke 72 length carrys out fitted bearing 79, and secondary group of magnets 73 mounting point is also be positioned at main yoke 72 internal diameter.
4th embodiment: the permanent magnetism canning pump having the monolateral supporting cantilever Relationship for Compound-Axis Structure of sensor, Fig. 1 (D);
Refer to shown in Fig. 1 (D), the permanent magnetism canning pump of the present embodiment is for there being the cantilever Relationship for Compound-Axis Structure of the monolateral support of sensor, and pumping system is made up of pump protecgulum 4a, impeller 5a, bonnet 41a, sensor 9, stationary axle 3a and canned motor 8;
Pump protecgulum 4a is provided with entrance 44, outlet 45 and flow channel space 47, be used for holding impeller 5a, pump protecgulum 4a is metal casting pot body, criticize in it and be covered with coffin 4b in anticorrosive plastic, be provided with a thrust ring 46 at entrance 44 place inside it, being used for is coupled with the thrust bearing 53 of impeller 5a inlet side forms axial thrust bearing jointly;
It is inner that impeller 5a is installed in pump protecgulum 4a, impeller boss 52 is used for being combined with the axial extension part 76 of motor rotor 7, impeller 5a is integrally formed or the two mutually embeds and is combined into one with motor rotor 7, the perforate of impeller boss plate 55 central authorities of impeller hub bore 54a system one is used for allowing circulating liquid reflux, as shown in flow direction 65, the runner that pump protecgulum entrance 44 becomes a level and smooth flaring with the entrance of impeller 5a does not have other obstacle, and the shape of impeller boss plate 55 is also smooth surface, effectively can reduce flow rate of liquid to guarantee that pumping has good anti-cavitation (NPSHr) performance,
Bonnet 41a is a cup-shaped shell construction, and boss 418 structure of a perforate is arranged at bottom, and the flange part 411 of its front end, in conjunction with the center flange 811 of pump protecgulum 4a and motor 8, is used for preventing the leakage of corrosion liquid, the cylindrical part of bonnet 41a side passes the internal diameter of stator 83, therebetween be slip loose fit, and fit tightly with motor after-frame 82 bottom bonnet 41a, when conveying fluid pressure is born in bonnet 41a internal capacity room space 415, the silicon steel plate of stator 83 is repeatedly long-pending can provide enough support strengths with motor after-frame 82, boss 418 is located at bonnet 41a bottom centre and axially inner side extends in main yoke 72 inner diameter volume, protrude for inner side and there is center hole 418a, inward recess 418b is relatively become outside it, the ring surface of inward recess 418b is equiped with sensing component 93, sensing component 93 is containing secondary yoke 91 and plural inductor coil 92, secondary yoke 91 and axle supporting base 821d tight knot close, the through hole at boss 418 center is used for installing stationary axle 3a, the sealing surface 418d of boss 418 seals by with axle sleeve 33 end face of O type and the axle supporting base 821d packing of motor after-frame 82, how generation is leaked to guarantee that bonnet 41a does not have,
Monitoring bearing wearing and tearing are used in the ring surface that sensor 9 is arranged on the outside inward recess 418b (as Fig. 3 (B)) of axially extended bonnet boss 418, its structure system is made up of secondary group of magnets 73 and sensing component 93, the quantity of secondary group of magnets 73 is identical with main magnet group 71, secondary group of magnets 73 is one end bottom bonnet 41a of main yoke 72 internal diameter of being installed on rotor and back to main magnet group 71, the axial length of secondary magnet 73 is at least more than two times of rotor 7 axial displacement length (containing bearing shaft to abrasion), sensing component 93 is be made up of secondary yoke 91 (as Fig. 3 (B)) and plural inductor coil 92 (as Fig. 3 (B)), secondary yoke 91 is to aim at the axial centre of secondary magnet 73 for benchmark, the axial length of secondary yoke 91 is divided into two sections, front and back, axial front and rear edge axially mobile front and back two segment limit that all can not exceed secondary yoke 91 of secondary magnet 73.
To be cantilever structure formed with motor after-frame 82 by corrosion-resistant Ceramic shaft sleeve 33 with abrasion performance, metal shaft 32, and jointly formed complete axle sealing system with bonnet 41a stationary axle 3a, one end of stationary axle 3a can obtain required support strength when being installed in the axle supporting base 821d of motor after-frame 82, wherein metal shaft 32 is through the center hole 332 (as Fig. 5 (B)) of Ceramic shaft sleeve 33, and the front-end face 333 (as Fig. 5 (B)) of Ceramic shaft sleeve is pressed on the one end with rounded nose 321 (as Fig. 5 (B)), the axis extension boss 418 of spiro tooth part 323 through bonnet 41a and the center through hole of axle supporting base 821d of metal shaft 32, and be tightly locked on motor after-frame 82a with nut, make the end face of the thrust ring portion 331 (as Fig. 5 (B)) of Ceramic shaft sleeve 33 can be pressed on the end face of axle supporting base 821d, the rounded nose 321 (as Fig. 5 (B)) of metal shaft 32 then with plastic, rubber-coating 322 (sign), on it and be provided with O type ring with reach sealing anti-corrosion function, the thrust ring portion 331 of Ceramic shaft sleeve 33 is used for being coupled mutually with rotor bearing 79 forming liquid hydrodynamic thrust bearing, the end face of the end face of thrust ring portion 331 and the axle supporting base 821d of after-frame 82 tightly locks compression, the sealing surface 418d of the two middle also packing boss 418, and by thrust ring portion 331 end face seal with O type ring, how to leak generation to guarantee that bonnet 41a does not have, and form the combined type stationary axle 3a of a high rigidity,
Canned motor 8 is made up of with motor rotor 7 stator 83, motor center 81, motor after-frame 82;
Stator 83 is fastening to be installed in motor center 81, it is wound with coil input PWM power supply can produce magnetic flux and be used for and motor rotor 7 magnetic field interaction effect, make motor rotor 7 produce moment of torsion and rotarily drive impeller 5a output stream merit, the coil 831 of stator 83 avoids corrosion liquid by pumping bonnet 41a protection and corrodes;
Motor center 81 is used for tightly locking bonnet 41a flange part 411 and pump protecgulum 4a at the flange 811 of pumping side, to prevent the leakage of corrosion liquid, the rear flange 811 of motor center 81 is used for tightly locking motor after-frame 82 to provide complete structure support force, makes the axle supporting base 821d on motor after-frame 82 can provide support force needed for composite solid dead axle 3a;
Motor after-frame 82 is tightly locked in the rear flange of center 81 pumping side, makes the axle supporting base 821d on motor after-frame 82 can provide support force needed for stationary axle 3a, and the power line of motor stator 83 coil 831 exports 822 by power cable and receives driving power;
Motor rotor 7 is by main magnet group 71, main yoke 72, the ring type structure that secondary group of magnets 73 and axial extension part 76 are formed, the quantity of secondary group of magnets 73 is identical with main magnet group 71, secondary group of magnets 73 is one end bottom bonnet 41a of main yoke 72 internal diameter of being installed on motor rotor 7 and back to main magnet group 71, and the annular rotor encapsulate 74 of a zero leakage seam is overmolding to by corrosion resistant engineering plastics, the intermediate hole of motor rotor 7 is equiped with bearing 79, impeller boss 52 is used for being combined with the axial extension part 76 of motor rotor 7, impeller 5a is integrally formed or the two mutually embeds and is combined into one with motor rotor 7,
When pumping operates, fluid flow direction 6 becomes the fluid with pressure after flowing through the runner of impeller 5a, as flow direction 61, and exported by pump discharge 45, there is segment fluid flow simultaneously, as flow direction 62, dorsal part via impeller 5a enters the room space 415 of bonnet 41a, and via outside motor rotor 7 with the gap of bonnet 41a internal diameter to bonnet 41a flows, again via the Clearance Flow of stationary axle 3a and bearing 79, finally flow through the impeller hub bore 54a of impeller boss plate 55 central authorities, as flow direction 65, get back to impeller 5a entrance, the circulating of this fluid is used to provide ceramic bearing 79 and lubricates required and take away the heat that motor rotor 7 produces,
Refer to shown in Fig. 2, this legend only carries out the explanation of thin portion with the motor rotor 7 of the 3rd embodiment with impeller 5 integrative-structure, the extended structure of this legend also will be applicable to this and create other embodiment, motor rotor 7 hollow portion is provided with bearing 79, be used for being coupled into liquid hydraulic bearing system with stationary axle 3 to support rotation and the transmission of power of motor rotor 7, axial extension part 76 is used for combining integral with impeller boss 52, effectively to transmit the power of motor rotor 7, one end inside the main yoke 72 that secondary group of magnets 73 is installed on motor rotor 7 bottom bonnet 41 and back to main magnet group 71, this secondary group of magnets 73 encapsulates together with motor rotor 7 avoids liquid to corrode, secondary group of magnets 73 quantity is equal with main magnet group 71 but volume is less than ten/ㄧ,
Refer to shown in Fig. 3 (A), for the bonnet 41 of the 3rd embodiment, the installation of its circular groove 413b structure and sensing component 93 is described in detail, bonnet 41 is a cup-shaped shell construction, and guarantee not have how to leak generation without any through hole, the flange part 411 of its front end, in conjunction with the center flange 811 (as Fig. 1 (A)) of pump protecgulum 4 and canned motor 8 (as Fig. 1 (A)), is used for preventing the leakage of corrosion liquid, boss 413 is located at bonnet bottom centre and axially inner side extends in main yoke 72 (as Fig. 1 (A)) inner diameter volume, axial extension G system is counted toward flange part 411 side bottom bonnet 41, protrude for inner side and there is central shaft hole 413a, the depth H of axis hole 413a is then counted bottom axis hole 413a by boss 413 opening, it is the structure of circular groove 413b outside it, the outer rim of its axis hole 413a can install thrust ring 414, circular groove 413b outside boss 413 can install sensing component 93, containing secondary yoke 91 and plural inductor coil 92, the outer wall of axis hole 413a completely by motor after-frame 82 axle supporting base 821a (as Fig. 4 (A)) and secondary yoke 91 combine closely, and the internal diameter of the bump backward 823 of the bottom of axis hole 413a and motor after-frame 82 is completely closely sealed, and the length of bump 823 (as Fig. 1 (A)) coordinates the depth H of axis hole 413a can give the support of stationary axle 3 (as Fig. 1 (A)) high rigidity completely, namely bonnet 41 itself only provides corrosion protection isolation features directly not provide stationary axle 3 rigid support,
Refer to shown in Fig. 3 (B), for the bonnet 41 of the 4th embodiment, the installation of its inward recess 418b structure and sensing component 93 is described in detail, bonnet 41a is a cup-shaped shell construction, its bottom centre has a perforate to be used for installing stationary axle 3a (as Fig. 1 (C)), the flange part 411 of its front end, in conjunction with the center flange 811 (as Fig. 1 (C)) of pump protecgulum 4a and canned motor 8 (as Fig. 1 (C)), is used for preventing the leakage of corrosion liquid, boss 418 is located at bonnet bottom centre and axially inner side extends in main yoke 72 (as Fig. 1 (C)) inner diameter volume, protrude for inner side and there is the protrusion hole structure of center hole 418a, sealing surface 418d is counted toward flange part 411 side bottom bonnet 41 in its axial extension G system, be inward recess 418b relatively outside it, the internal spherical surface installing sensing component 93 of inward recess 418b, sensing component 93 is containing secondary yoke 91 and plural inductor coil 92, secondary yoke 91 and axle supporting base 821d tight knot close, the through hole at boss 418 center is used for installing stationary axle 3a (as Fig. 1 (C)), the sealing surface 418d of boss 418 seals by with axle sleeve 33 (as Fig. 1 (the C)) end face of O type ring and the axle supporting base 821d packing of motor after-frame 82, how generation is leaked to guarantee that bonnet 41a does not have, and the rigid support of stationary axle 3a is completely from the center hole length L of motor after-frame 82 and axle supporting base 821d thereof,
Refer to shown in Fig. 4 (A), for the bilateral support stationary axle 3 of the 3rd embodiment, elaborate to axially gripping length L, boss 413 is located at bonnet 41 bottom centre and axially inner side extends in main yoke 72 (as Fig. 1 (C)) inner diameter volume, protrude for inner side and there is central shaft hole 413a (as Fig. 3 (A)), it is the structure of circular groove 413b (as Fig. 3 (A)) outside it, and the inside installing sensing component 93 of circular groove 413b is containing secondary yoke 91 and plural inductor coil 92, the axle supporting base 821a of motor after-frame 82 and secondary yoke 91 are combined closely and are given the outer wall maximum support intensity of axis hole 413a completely, and the support strength of motor after-frame 82 is from motor center 81, therefore can give stationary axle 3 high rigid support,
Axle grips length L system and determines with the axial extension G of boss 413 and axis hole depth H, and energy is actual provide axle rigid support, the longer problem that more can overcome plastics material intensity Yin Wendu rising and reduction of axle gripping length L;
Refer to shown in Fig. 4 (B), grip length L with the axis of the cantilever stationary axle 3a of the 4th embodiment (as Fig. 1 (C)) to elaborate, bonnet 41a is a cup-shaped shell construction, its bottom centre has a boss 418 and axially inner side extends in main yoke 72 inner diameter volume, be used for installing stationary axle 3a, protrude for inner side and there is the protrusion hole structure of center hole 418a, be inward recess 418b relatively outside it, the internal spherical surface installing sensing component 93 of inward recess 418b, the axle supporting base 821d of motor after-frame 82 and the end face of thrust ring portion 331 (as Fig. 5 (B)) tightly lock compression, and the sealing surface 418d of packing boss 418 guarantees to seal zero leakage,
Axle grips length L system and determines with the axial extension G of boss 418 and axis hole degree of depth L, actually can provide axle rigid support, axle grips that length L is longer more can bear multi-load power and moment of torsion thereof, and the plastics material intensity Yin Wendu that the Relationship for Compound-Axis Structure of this creation can avoid bonnet 41a completely raises and the problem of reduction;
Refer to shown in Fig. 5 (A), with the motor rotor 7 of the first embodiment or the 3rd embodiment, at the multi-load of bilateral support stationary axle 3, stressed and moment of torsion elaborates, stationary axle 3 is made up of the corrosion-resistant stupalith with abrasion performance, its front end is supported by the tripod 31 of plastics material, rear end by the boss 413 axially stretched out support fixing, and the intensity of boss 413 provided from the axle supporting base 821b combined closely and secondary yoke 91, in the middle of stationary axle 3 part be coupled with bearing 79 for support the rotation of motor rotor 7 and intermediate portion part length to meet the length of bearing 79, and the axis of reserved motor rotor 7 moves freely space, as the A in figure, B and C, axial clearance A is still had between bearing 79 and thrust ring 414 when motor rotor 7 real-world operation, axial clearance C is had between rotor bearing 79 and tripod 31, axial clearance B is had between rotor 7 and bonnet 41, this three gap can because of entrance thrust ring 46, thrust bearing 53, the wearing and tearing of thrust ring 414 and the end wear of bearing 79 and change, most situation motor rotor 7 can move forward because of the end thrust of impeller 5, thrust ring 46 is made to be coupled to slide with bearing 53 and to operate, so, the width of clearance C must be greater than the tear-and-wear allowance amount of thrust ring 46 and bearing 53, and gap B can strengthen its width because clearance C diminishes, but under pumping operates at the condition of high flow capacity low lift, backward motor rotor 7 may move because of the axial momentum of fluid, thrust ring 414 is made to be coupled to slide with bearing 79 and to operate, at this moment the width of gap A is decreased to zero, so the width of gap B must be greater than the abrasion loss that gap A adds upper bearing (metal) 79 end face and thrust bearing 414, breakage is caused to avoid motor rotor 7 direct friction bonnet 41, namely the axial free displacement length of motor rotor 7 equals gap A and adds clearance C, because plastic bonnet 41 is larger with the size distortion amount of protecgulum 4, each reserved gap size all must comprise manufacturing tolerances, under above-mentioned operating condition, stationary axle 3 and supporting structure thereof must bear multi-load power, containing gravity W, centrifugal force X, the moment of torsion of lateral force P and each force, the wherein power that produces for rotor weight of gravity W, centrifugal force X is that rotor centroid is because causing eccentric centrifugal power in bearing 79 gap, lateral force P is that the boiling fluid pressure of the flow channel space 47 of pump protecgulum 4 causes the power being applied to impeller 5, and gravitational moment is exactly gravity W is multiplied by arm of force WL, centrifugal moment is exactly that centrifugal force X is multiplied by arm of force XL, side direction moment is exactly that lateral force P is multiplied by arm of force PL, the conjunction of these power and moment just become be applied to fixing axle head make a concerted effort and moment of torsion, and the supporting structure by stationary axle 3 rear end born by the power of majority and moment, because the tripod of corrosion-resistant plastic 31 can raise and reduce its intensity by Yin Wendu, bearing 79 wear away caused eccentric centrifugal power X be stationary axle 3 structural rigidity maximum fluctuating load source, higher eccentric centrifugal power X is larger for abrasion loss, secondly for boiling fluid pressure causes the lateral force P being applied to impeller 5, because having the longest arm of force PL by impeller 5 external diameter to stationary axle 3 rear end, also can cause produce between motor rotor 7 center and stationary axle 3 axle center crooked, be directed at the continuous deformation of supporting structure, the length of arm of force PL due to axial extension G substantial reduction, and grip length L increase stationary axle 3a to the ability to bear of moment of torsion, can slow down and improve above-mentioned crooked and constructional variant problem, and significantly reduce the demand of the tripod 31 supporting structure intensity of stationary axle 3 front end,
Refer to shown in Fig. 5 (B), to the motor rotor 7 of the second embodiment or the 4th embodiment, at the multi-load of side cantilever stationary axle 3a, stressed and moment of torsion elaborates, stationary axle 3a is made up of metal shaft 32 and Ceramic shaft sleeve 33, one end of stationary axle 3a can obtain required support strength when being installed in the axle supporting base 821d of motor after-frame 82, wherein metal shaft 32 is through the center hole 332 of Ceramic shaft sleeve 33, and the front-end face 333 of Ceramic shaft sleeve is pressed on the one end with rounded nose 321, the boss 418 of spiro tooth part 323 through bonnet 41a and the center through hole of axle supporting base 821d of metal shaft 32, and be tightly locked on motor after-frame 82 with nut, make the end face of the thrust ring portion 331 of Ceramic shaft sleeve 33 can be pressed on the end face of axle supporting base 821d, and form high rigid composite stationary axle 3a, stationary axle 3a is coupled for supporting the rotation of motor rotor 7 and its length meets the length requirement of bearing 79 with bearing 79, and the axis of reserved motor rotor 7 moves freely space, as A and B in figure, when motor rotor 7 real-world operation bearing 79 with still have axial clearance A (coordinating Fig. 5 (A)) between thrust ring 414, axial clearance B is had between motor rotor 7 and bonnet 41a, this two gap can because of entrance thrust ring 46, thrust bearing 53, the wearing and tearing of thrust ring 414 and the end wear of bearing 79 and change, most situation motor rotor 7 can move forward because of the end thrust of impeller 5a, thrust ring 46 is made to be coupled to slide with bearing 53 and to operate, and therefore gap B can strengthen its width, but under pumping operates at the condition of high flow capacity low lift, backward motor rotor 7 can move because of the axial momentum of fluid, thrust ring 414 is made to be coupled to slide with bearing 79 and to operate, the width of gap A is decreased to zero, so the width of gap B must be greater than the abrasion loss that gap A adds upper bearing (metal) 79 end face and thrust bearing 414, breakage is caused to avoid motor rotor 7 direct friction bonnet 41a, namely gap A changes with the axial free displacement of motor rotor 7, because the size distortion amount of plastic bonnet 41a is larger, each reserved gap size all must comprise manufacturing tolerances, stationary axle 3a and supporting structure thereof must bear multi-load power, containing gravity W, centrifugal force X, lateral force P and moment of torsion thereof, the wherein power that produces for rotor weight of gravity W, centrifugal force X is that rotor centroid is because causing the eccentric centrifugal power of disalignment in bearing 79 gap, lateral force P is that the boiling fluid pressure of the flow channel space 47 of pump protecgulum 4a causes the power being applied to impeller 5a, and gravitational moment is exactly gravity W is multiplied by arm of force WL, centrifugal moment is exactly that centrifugal force X is multiplied by arm of force XL, side direction moment is exactly that lateral force P is multiplied by arm of force PL, the conjunction of these power and moment just become be applied to fixing axle head make a concerted effort and moment of torsion, and the supporting structure by stationary axle 3a rear end born by whole power and moment, it is maximum fluctuating load source that bearing 79 wears away caused eccentric centrifugal power X, higher eccentric centrifugal power X is larger for abrasion loss, secondly for boiling fluid pressure causes the lateral force P being applied to impeller 5, because having the longest arm of force PL by impeller 5 external diameter to stationary axle 3a rear end, also can cause produce between motor rotor 7 center and stationary axle 3a axle center crooked, be directed at the continuous deformation of supporting structure, the length of arm of force PL due to axial extension G substantial reduction, and grip length L increase stationary axle 3a to the ability to bear of moment of torsion, can slow down and improve above-mentioned crooked and constructional variant problem,
5th embodiment: the bearing wear monitoring device structure of permanent magnetism canning pump, Fig. 6 (A), Fig. 6 (B), Fig. 6 (C) and Fig. 6 (D);
Shown in Fig. 6 (A), this figure illustrates the radial structure of bearing wear monitoring device, this legend adopt 8 pole 8 coil design systems be only used for illustrate one of example, other design can reaching identical effect is not limited with the present embodiment, the structure system of sensor 9 is made up of secondary group of magnets 73 and sensing component 93, near bonnet 41 bottom end and back to main magnet group 71 inside the main yoke 72 that secondary group of magnets 73 is installed on motor rotor 7, secondary group of magnets 73 quantity is equal with main magnet group 71 but volume is less than 1/10th, and its area and thickness at least can provide magnetomotive force needed for inductor coil and Magnetic flux density, according to secondary magnet quantity 8, circumference down is become eight electrical angles 180 degree and space angle 45 degree herein, its magnetic line of force of main magnetic circuit 96a is arrived the teeth portion 83a of stator 83 through air gap 98 by the injection of main magnet 71a surface, again also again get back to and originally adjacent main magnet 71b through air gap 98 through adjacent fingers 83c via stator yoke iron 83b, and get back to original main magnet 71a via main yoke 72 and form airtight magnetic circuit 96a, its magnetic line of force of sensing magnetic circuit 96 arrives secondary yoke 91 by the injection of secondary magnet 73a surface through air gap 97, again get back to and originally adjacent secondary magnet 73b and secondary magnet 73c through air gap 97 via secondary yoke again, and get back to original secondary magnet via main yoke 72 and form airtight magnetic circuit 96, sensing magnetic circuit 96 is made to coexist in main yoke with both main magnetic circuit 96a magnetic line of force, namely the magnetic line of force of sensor is interference-free through main yoke, when motor rotor 7 rotates, sensing component exports induced voltage signal by cutting magnetic line, therefore voltage signal does not independently disturb by external voltage, sensing component 93 is be made up of secondary yoke 91 and plural inductor coil 92, plural number inductor coil 92 is be installed in secondary yoke 91 surface, alignment secondary magnet axial centre 73g has the axial arranged adjacent of front inductor coil 92a and rear inductor coil 92b, at circumferencial direction, inductor coil 92 is divided into coil α and coil β bis-groups again, often organized four inductor coils in radial 180 degree of mutual correspondences, 8 inductor coils are respectively α 11, α 12, α 21, α 22, β 11, β 12, β 21, β 22and measure-alike, and coil α differs 90 degree (270 degree) at electrical angle with coil β, namely on space angle Θ, differ 22.5 degree (67.5 degree), inductor coil 92a has coil α 11, coil α 21, coil β 11, coil β 21, inductor coil 92b has coil α 12, coil α 22, coil β 12, coil β 22, the electric angle location of above-mentioned inductor coil 92 is reached by the electrical Location point 911 of the trailing edge 91b being positioned at secondary yoke 91 with space angle positioning systems, and electrical Location point 911 aligns inductor coil α 11center, electrical angle 90 degree of space angle 22.5 degree, to facilitate the maintain and replace of sensing component 93, the axial length of inductor coil 92 is not less than secondary magnet axial length and adds the free axial displacement of motor rotor 7 (containing thrust bearing abrasion limit value), and the circumferential width of inductor coil 92 is not more than electrical angle 180 degree, the axial length of secondary yoke 91 be greater than inductor coil 92 arrange after axial overall length and its leading edge 91a and trailing edge 91b can contain its inductor coil 92 completely, during to guarantee motor rotor 7 axial displacement, the magnetic line of force of the sensing magnetic circuit 96 of secondary magnet still can keep stablizing unaffected and distortion or deviation, can guarantee that the voltage signal stability of inductor coil 92 is with linear, its influence electricity pressure reduction can be obtained when motor rotor 7 has radial direction, axial displacement, the influence electricity pressure reduction of different inductor coil combinations can represent axis or radial displacement, when displacement amount exceedes displacement gaps, representing bearing has abrasion occur and can calculate abrasion loss, displacement must to give a warning notice when exceeding abrasion warning value, and displacement exceedes when wearing away limits value pumping must be stopped to operate,
Refer to shown in Fig. 6 (B), Fig. 6 (C), Fig. 6 (D) Yu Fig. 6 (E), this figure is used for illustrating inductor coil actual arrangement mode and the calculation of lightning induced voltage method of bearing wear monitoring device, this legend adopt 8 pole 8 coil design systems be only used for illustrate one of example, other can reach the design of identical effect or numeration is not limited with the present embodiment, and detecting device adopts 8 inductor coils 92 to be respectively α 11, α 12, α 21, α 22, β 11, β 12, β 21, β 22form a rotating magnetic field when motor rotor 7 rotates between secondary magnet and inductor coil 92 and export induced voltage, these induced voltage signals can use the method for d-q axle to calculate, and be converted to axial displacement and the radial displacement of motor rotor 7 further, as bearing wear basis for estimation, be described as follows:
The signal of the detecting device of 8 groups of coils adopts the signal of mean value, its average value signal:
e αT = 1 4 ( e α 11 + e α 12 + e α 21 + e α 22 ) - - - ( 1 a )
e βT = 1 4 ( e β 11 + e β 12 + e β 21 + e β 22 ) - - - ( 1 b )
Because above-mentioned average value signal will not affect by axial and radial bearing wear, and e α Tand e β Tsignal phase differ 90 °, suppose e α Tand e β Tfunction be:
e αT = λ mT ′ ω r cos θ r - f - - - ( 2 )
e βT = λ mT ′ ω r sin θ r - f - - - ( 3 )
ω in formula rfor rotating speed, λ mTfor the secondary magnet 73 of detecting device and inductor coil 92 are coupled equivalent magnetic flux, θ r-ffor the electrical angle position of detecting device signal.
ω rand θ r-fcan be learnt by (2) and (3):
ω ^ r = 1 λ mT ′ e αT 2 + e βT 2 - - - ( 4 )
θ ^ r - f = tan - 1 e βT e αT - - - ( 5 )
Wherein, can be obtained by actual measurement, and pumping actual speed and space angle can be obtained by following formula:
n pfor number of poles, this routine N p=8 (6a)
θ m = 2 N p θ r - f - - - ( 6 b )
In order to carry out axis and the gauge wear of calculation bearing, each coil signal is converted to magnetic field d-q axial coordinate, as follows:
e αβ11＝[e α11e β11] T(7a)
e αβ12＝[e α12e β12] T(7b)
e αβ21＝[e α21e β21] T(7c)
e αβ22＝[e α22e β22] T(7d)
T θ ( θ ^ r - f ) = cos θ ^ r - f - sin θ ^ r - f sin θ ^ r - f cos θ ^ r - f - - - ( 8 )
e qd 11 = T θ ( θ ^ r - f ) e αβ 11 - - - ( 9 a )
e qd 12 = T θ ( θ ^ r - f ) e αβ 12 - - - ( 9 b )
e qd 21 = T θ ( θ ^ r - f ) e αβ 21 - - - ( 9 c )
e qd 22 = T θ ( θ ^ r - f ) e αβ 22 - - - ( 9 d )
The basis for estimation of bearing axial displacement and abrasion is that the two large person of difference following is as the criterion:
ε a11＝e qd11-e qd12(10a)
ε a21＝e qd21-e qd22(10b)
The basis for estimation of bearing radial displacement and abrasion is that the two large person of difference following is as the criterion:
ε r11＝e qd11-e qd21(11a)
ε r21＝e qd12-e qd22(11b)
Bearing is radial to be as the criterion according to for the two large person of difference following with the comprehensive descision of axial displacement and abrasion:
ε m11＝e qd11-e qd22(12a)
ε m12＝e qd12-e qd21(12b)
Center displacement amount and the Angle Position of rotor just can be calculated, namely the actual motion track of rotor axis according to above formula.
6th embodiment: the bearing wear monitoring device structure of permanent magnetism canning pump, Fig. 6 (F);
Refer to shown in Fig. 6 (F), this figure illustrates that the inductor coil 92 of the bearing wear monitoring device of the 5th embodiment is reduced to 4, this legend example that one of adopts 8 pole 4 coil design systems to be only used for illustrating, other can reach the design of identical effect or numeration is not limited with the present embodiment; The area of secondary magnet 73 and thickness at least can provide magnetomotive force needed for inductor coil and Magnetic flux density, and sensing component 93 is be made up of secondary yoke 91 and plural inductor coil 92; According to secondary magnet 73 quantity eight, circumference down is become electrical angle 180 degree and eight equal portions of space angle 45 degree herein; Inductor coil 92 is divided into coil α and coil β bis-groups, is respectively α 1, α 2with β 1, β 2, wherein difference 22.5 degree (67.5 degree) on α and β coil electric angle difference 90 degree of (270 degree) space angle Θ, each group two sub-inductor coil radial direction 180 degree is corresponding, inductor coil α 1, α 2, β 1, β 2for measure-alike coil, and axial length is the length being not less than secondary magnet adds that motor rotor 7 free axis is to shift length (containing thrust bearing abrasion limit value), and the circumferential width of inductor coil 92 is not more than electrical angle 180 degree; α 1with β 2the leading edge 91a of coil leading edge alignment secondary yoke 91, α 1with β 2the trailing edge 73f of coil trailing edge alignment secondary magnet 73, α 2with β 1the leading edge 73e of coil leading edge alignment secondary magnet 73, α 2with β 1coil trailing edge near the trailing edge 91b of secondary yoke 91, namely α 1, α 2, β 1, β 2for alignment secondary magnet shaft forward trailing edge mode be axially staggered; The electric angle location of above-mentioned inductor coil 92 is reached by electrical Location point 911 with space angle positioning systems, and electrical Location point 911 is positioned at the trailing edge 91b of secondary yoke 91 and aligns inductor coil α 1center, electrical angle 90 degree of space angle 22.5 degree, to facilitate the maintain and replace of sensing component 93; The axial overall length of secondary yoke 91 be greater than inductor coil 92 arrange after axial overall length and its leading edge 91a and trailing edge 91b can contain its inductor coil 92 completely, during to guarantee motor rotor 7 axial displacement, the magnetic line of force of the sensing magnetic circuit 96 of secondary magnet still can keep stablizing unaffected and distortion or deviation, maintain and be stably distributed in secondary yoke 91 surface, can guarantee that the voltage signal stability of inductor coil 92 is with linear; The induced voltage difference calculating coil 92 can obtain rotor at axis and radial displacement, when displacement amount exceed motor rotor 7 move freely threshold value time, represent thrust bearing and radial bearing to have to wear away and occur and can abrasion loss be calculated, displacement must give a warning when exceeding bearing wear warning value notice, pumping must be stopped to operate when displacement exceedes bearing wear limits value;
The signal of the detecting device of 4 coils adopts the signal of mean value, its average value signal and be
e αT = 1 2 ( e α 1 + e α 2 ) - - - ( 13 a )
e βT = 1 2 ( e β 1 + e β 2 ) - - - ( 13 b )
Because above-mentioned average value signal will not affect by axial and radial pivot friction, and e α Tand e β Tsignal phase differ 90 °, suppose e α Tand e β Tfunction be:
e αT = λ mT ′ ω r cos θ r - f - - - ( 14 )
e βT = λ mT ′ ω r sin θ r - f - - - ( 15 )
ω in formula rfor rotating speed, λ mTfor magnet and the coil coupling equivalence magnetic flux of detecting device, θ r-ffor the electrical angle position of detecting device signal.ω rand θ r-fcan be learnt by (2) and (3):
ω ^ r = 1 λ mT ′ e αT 2 + e βT 2 - - - ( 16 )
θ ^ r - f = tan - 1 e βT e αT - - - ( 17 )
Wherein, can be obtained by actual measurement, and pumping actual speed and space angle can be obtained by following formula:
n pfor number of poles, this routine N p=8 (18a)
θ m = 2 N p θ r - f - - - ( 18 b )
In order to carry out axis and the gauge wear of calculation bearing, each coil signal is converted to magnetic field d-q axial coordinate, as follows:
e a12＝[e α1e β2] T(19a)
e a21＝[e α2e β1] T(19b)
e r11＝[e α1e β1] T(19c)
e r22＝[e α2e β2] T(19d)
T θ ( θ ^ r - f ) = cos θ ^ r - f - sin θ ^ r - f sin θ ^ r - f cos θ ^ r - f - - - ( 20 )
e qd 12 = T θ ( θ ^ r - f ) e a 12 - - - ( 21 a )
e qd 21 = T θ ( θ ^ r - f ) e a 21 - - - ( 22 b )
e qd 11 = T θ ( θ ^ r - f ) e r 11 - - - ( 23 a )
e qd 22 = T θ ( θ ^ r - f ) e r 22 - - - ( 24 b )
The basis for estimation of bearing axial displacement and abrasion is following difference:
ε a＝e qd12-e qd21(25)
The basis for estimation of bearing radial displacement and abrasion is following difference:
ε r＝e qd11-e qd22(26)
The comprehensive descision foundation of bearing radial direction and axial displacement and abrasion is for consider ε simultaneously awith ε r, center displacement amount and the Angle Position θ of rotor just can be calculated according to above formula m, the namely actual motion track of rotor axis.
7th embodiment: permanent magnetism canning pump sensor is equiped with Hall subassembly, Fig. 7;
Refer to shown in Fig. 7, illustrate that Hall subassembly 94 is installed in the position description of sensing component, this legend example that one of adopts the compound detective device system of 3,8 pole ear assembly 94 and 4 inductor coils 92 to be suddenly only used for illustrating, other design can reaching identical effect is not limited with the present embodiment, inductor coil 92 is divided into coil α and coil β bis-groups, is respectively α 1, α 2with β 1, β 2, wherein difference 22.5 degree (67.5 degree) on α and β coil electric angle difference 90 degree of (270 degree) space angle Θ, each group two sub-inductor coil radial direction 180 degree is corresponding, inductor coil α 1, α 2, β 1, β 2for measure-alike coil, and axial length is the length being not less than secondary magnet adds that motor rotor 7 free axis is to shift length (containing thrust bearing abrasion limit value), and the circumferential width of inductor coil 92 is not more than electrical angle 180 degree; α 1with β 2the leading edge 91a of coil leading edge alignment secondary yoke 91, α 1with β 2the trailing edge 73f of coil trailing edge alignment secondary magnet 73, α 2with β 1the leading edge 73e of coil leading edge alignment secondary magnet 73, α 2with β 1coil trailing edge near the trailing edge 91b of secondary yoke 91, namely α 1, α 2, β 1, β 2for alignment secondary magnet shaft forward trailing edge mode be axially staggered; The electric angle location of above-mentioned inductor coil 92 is reached by electrical Location point 911 with space angle positioning systems, and electrical Location point 911 is positioned at the trailing edge 91b of secondary yoke 91 and aligns inductor coil α 1center, electrical angle 90 degree of space angle 22.5 degree, to facilitate the maintain and replace of sensing component 93; 3 Hall subassembly 94 electrical angle differences, 120 degree of space angle differences 30 degree, the Hall subassembly 94 of intermediate position is just in time positioned at inductor coil α 2inside center, electrical angle 90 degree of space angle 202.5 degree, all the other 2 Hall subassemblies 94 are positioned at inductor coil α 2both sides external interval electrical angle 120 degree; The axial overall length of secondary yoke 91 be greater than inductor coil 92 arrange after axial overall length and its inductor coil 92 outer rim can be contained completely, during to guarantee motor rotor 7 axial displacement, the magnetic line of force of the sensing magnetic circuit 96 of secondary magnet still can keep stablizing unaffected and distortion or deviation, maintain and be stably distributed in secondary yoke 91 surface, can guarantee that the voltage signal stability of inductor coil 92 is with linear; The induced voltage difference calculating coil 92 can obtain rotor at axis and radial displacement, when displacement amount exceed motor rotor 7 move freely threshold value time, represent thrust bearing and radial bearing to have to wear away and occur and can abrasion loss be calculated, displacement must give a warning when exceeding bearing wear warning value notice, displacement must stop pumping operating when exceeding bearing wear limits value, and bearing wear computational methods are as shown in the 6th embodiment; When motor rotor 7 operates and when having axial displacement to occur; the magnetic line of force of sensing magnetic circuit 96 still can keep stablizing unaffected and being out of shape or deviation; the voltage signal stability of Hall subassembly 94 can be guaranteed; and the voltage signal of reversal of magnetism can be provided to be used for calculating magnetic pole angle, to provide the driver of sensor to drive permanent magnetism canning pump.

Claims (9)

1. a permanent magnetism canning pump structure, permanent magnetism canning pump is the fixed axle structure of the bilateral support without sensor, and major part includes: pump protecgulum, tripod, impeller, bonnet, stationary axle and canned motor, is characterized in that: wherein,
Be covered with an entrance, outlet and a flow channel space before pump, be used for holding impeller, be provided with an entrance thrust ring in ingress inside pump protecgulum, being used for is coupled with the impeller thrust bearing of impeller eye side forms axial thrust bearing jointly;
Tripod system is fixed on pump protecgulum ingress, can axially across impeller hub bore, is used for supporting one end of stationary axle;
It is inner that impeller is installed in pump protecgulum, and tripod can axially across impeller hub bore, and be used for supporting one end of stationary axle, impeller boss is used for being combined with the axial extension part of motor rotor, impeller is integrally formed or the two mutually embeds and is combined into one with motor rotor;
Bonnet is a cup-shaped shell construction, and bottom has the boss of tool ring channel structures and without any through hole, guarantee that bonnet does not have and how to leak generation, the outer rim of its axis hole is equiped with thrust ring, is used for being coupled into axial thrust bearing with the bearing of rotor; The flange part of bonnet front end, in conjunction with the center flange of pump protecgulum and motor, is used for preventing the leakage of corrosion liquid; The cylindrical part of bonnet side, through the internal diameter of stator, is slip loose fit therebetween, and fits tightly with motor after-frame bottom bonnet;
Boss is located at bonnet bottom centre and axially inner side extends in main yoke inner diameter volume, and protruding for inner side and have central shaft hole, is the structure of circular groove outside it; The outer side surface of axis hole, completely by axially extended axle supporting base combine closely and the support of the motor after-frame of high support strength, can give the support of stationary axle height support strength;
Stationary axle is bilateral support structure, be made up of the corrosion-resistant stupalith with abrasion performance, its front end is supported by tripod and is supported fixing with rear end by the boss axially stretched out, stationary axle is coupled for the rotation of support rotor with bearing, and its length meets the length of bearing to bear the composite force suffered by rotor;
Canned motor is made up of stator, motor center, motor after-frame and motor rotor;
Stator is fastening to be installed in motor center, it is wound with coil input PWM power supply can produce magnetic flux and be used for and rotor field interaction effect, make rotor produce moment of torsion and rotate and impeller output stream merit, the coil of stator avoids corrosion liquid by the protection of pumping bonnet and corrodes;
Motor center is fabricated metals, be used for tightly locking bonnet flange part and pump protecgulum at the flange of pumping side, to prevent the leakage of corrosion liquid, the rear flange of motor center is used for tightly locking after-frame to provide complete structure support force, makes the axle supporting base on motor after-frame can provide support force needed for stationary axle;
Motor after-frame is fabricated metals, is tightly locked in the rear flange of motor center pumping side, and the power line of motor stator coils is exported by power cable receives driving power;
Axle supporting base on motor after-frame is axial inner side extended structure, and axle supporting base is combined closely the boss of bonnet bottom centre, and provides the support force needed for stationary axle to comprise required axle to grip length;
Motor rotor is the ring type structure be made up of main magnet group, main yoke and axial extension part, be installed on bonnet room space, main magnet group is installed in main yoke outer ring surface equal angles, and the annular rotor encapsulate of a zero leakage seam is overmolding to by corrosion resistant engineering plastics, the intermediate hole of motor rotor is equiped with the composite force that ceramic bearing is used for being coupled with stationary axle to bear suffered by motor rotor, impeller boss is used for being combined with the axial extension part of motor rotor, impeller is integrally formed or the two mutually embeds and is combined into one with motor rotor;
The inner diameter volume of main yoke can be held and is installed in bonnet bottom centre and the axle supporting base of the axially boss that extends of inner side and motor after-frame.
2. a permanent magnetism canning pump structure, permanent magnetism canning pump is the cantilever fixed axle structure of the monolateral support without sensor, and major part includes: pump protecgulum, impeller, bonnet, composite shaft and canned motor, is characterized in that: wherein,
An entrance, outlet and a flow channel space is covered with before pump, be used for holding impeller, the runner that the entrance of pump protecgulum entrance and impeller becomes a level and smooth flaring does not have other obstacle, pump protecgulum is metal casting pot body, criticize in it and be covered with anticorrosive plastic liner, be provided with an entrance thrust ring in ingress inside it, being used for is coupled with the impeller thrust bearing of impeller eye side forms axial thrust bearing jointly;
It is inner that impeller is installed in pump protecgulum, impeller boss is used for being combined with the axial extension part of motor rotor, impeller is integrally formed or the two mutually embeds and is combined into one with motor rotor, the perforate of impeller boss plate central authorities of impeller hub bore system one is used for allowing circulating liquid reflux, the runner that the entrance of pump protecgulum entrance and impeller becomes a level and smooth flaring does not have other obstacle, and the shape of impeller boss plate is also smooth surface;
Bonnet is a cup-shaped shell construction, and the boss structure of a perforate is arranged at bottom, and the flange part of its front end, in conjunction with the center flange of pump protecgulum and motor, is used for preventing the leakage of corrosion liquid; The cylindrical part of bonnet side, through the internal diameter of stator, is slip loose fit therebetween, and fits tightly with motor after-frame bottom bonnet;
Boss is located at bonnet bottom centre and axially inner side extends in main yoke inner diameter volume, protrude for inner side and there is center hole, relatively become inward recess outside it, and outer side surface is completely by axially extended axle supporting base combine closely and the support of the motor after-frame of high support strength; The through hole at boss center is used for installing stationary axle, and the sealing surface of boss seals by with the end face of shaft bush of O type ring and the axle supporting base packing of motor after-frame, how to leak generation to guarantee that bonnet does not have;
To be cantilever structure be made up of corrosion-resistant Ceramic shaft sleeve, metal shaft and motor after-frame with abrasion performance stationary axle, and jointly form complete axle sealing system with bonnet, one end of stationary axle can obtain required support strength when being installed in the axle supporting base of motor after-frame, stationary axle is coupled with bearing the rotation for supporting motor rotor, and its length meets the length of bearing to bear the composite force suffered by motor rotor;
Metal shaft is through the center hole of Ceramic shaft sleeve, and the front-end face of Ceramic shaft sleeve is pressed on the one end with rounded nose, the axis extension boss of spiro tooth part through bonnet of metal shaft and the center through hole of axle supporting base, and be tightly locked on motor after-frame with nut, make Ceramic shaft sleeve thrust ring portion be pressed on the end face of axle supporting base, the rounded nose of metal shaft, then with plastic, rubber-coating, which is provided with O type ring to reach the anti-corrosion function of sealing;
The thrust ring portion of Ceramic shaft sleeve is used for being coupled mutually with rotor bearing forming liquid hydrodynamic thrust bearing, the end face of the end face of thrust ring portion and the axle supporting base of after-frame tightly locks compression, the sealing surface of the two middle also packing boss, and sealed by the thrust ring end surface with O type ring, how to leak generation to guarantee that bonnet does not have;
The axle supporting base that on after-frame, axially inner side extends is combined closely the boss of bonnet bottom centre, and provide the support force needed for stationary axle to comprise required axle gripping length, when metal shaft is tightly locked on motor after-frame with nut, the biend of Ceramic shaft sleeve is tightly pushed down by the end face of the rounded nose of metal shaft and axle supporting base, and forms the combined type stationary axle of a high support strength;
Canned motor is made up of motor stator, motor center, motor after-frame and rotor;
Stator is fastening to be installed in motor center, it is wound with coil input PWM power supply can produce magnetic flux and be used for and rotor field interaction effect, make rotor produce moment of torsion and rotarily drive impeller output stream merit, the coil of stator avoids corrosion liquid by the protection of pumping bonnet and corrodes;
Motor center is fabricated metals, be used for tightly locking bonnet flange part and pump protecgulum at the flange of pumping side, to prevent the leakage of corrosion liquid, the rear flange of motor center is used for tightly locking after-frame to provide complete structure support force, makes the axle supporting base on motor after-frame can provide support force needed for composite solid dead axle;
Motor after-frame is fabricated metals, is tightly locked in the rear flange of motor center pumping side, and the power line of motor stator coils is exported by power cable receives driving power;
Axle supporting base on motor after-frame is axial inner side extended structure, to combine closely the boss of bonnet bottom centre, and provide the support force needed for stationary axle to comprise required axle gripping length, the end face of the end face of axle supporting base and the thrust ring portion of Ceramic shaft sleeve tightly locks compression, the sealing surface of the two middle also packing boss, and sealed by the thrust ring end surface with O type ring, how to leak generation to guarantee that bonnet does not have;
Motor rotor is the ring type structure be made up of main magnet group, main yoke and axial extension part, be installed on bonnet room space, main magnet group is installed in main yoke outer ring surface equal angles, and the annular rotor encapsulate of a zero leakage seam is overmolding to by corrosion resistant engineering plastics, the intermediate hole of motor rotor is equiped with the composite force that ceramic bearing is used for being coupled with stationary axle to bear suffered by motor rotor, impeller boss is used for being combined with the axial extension part of motor rotor, impeller is integrally formed or the two mutually embeds and is combined into one with motor rotor;
The inner diameter volume of main yoke can be held and is installed in bonnet bottom centre and the axle supporting base of the axially boss that extends of inner side and after-frame.
3. a permanent magnetism canning pump structure, permanent magnetism canning pump is for there being the fixed axle structure of the bilateral support of sensor, and major part includes: pump protecgulum, tripod, impeller, bonnet, sensor, stationary axle and canned motor, is characterized in that: wherein,
Be covered with an entrance, outlet and a flow channel space before pump, be used for holding impeller, be provided with an entrance thrust ring in ingress inside pump protecgulum, being used for is coupled with the impeller thrust bearing of impeller eye side forms axial thrust bearing jointly;
Tripod system is fixed on pump protecgulum ingress, can axially across impeller hub bore, is used for supporting one end of stationary axle;
It is inner that impeller is installed in pump protecgulum, and tripod can axially across impeller hub bore, and be used for supporting one end of stationary axle, impeller boss is used for being combined with the axial extension part of motor rotor, impeller is integrally formed or the two mutually embeds and is combined into one with motor rotor;
Bonnet is a cup-shaped shell construction, and bottom has the boss of tool ring channel structures and without any through hole, guarantee that bonnet does not have and how to leak generation, the outer rim of its axis hole is equiped with thrust ring, is used for being coupled into axial thrust bearing with the bearing of rotor; The flange part of bonnet front end, in conjunction with the center flange of pump protecgulum and motor, is used for preventing the leakage of corrosion liquid; The cylindrical part of bonnet side, through the internal diameter of stator, is slip loose fit therebetween, and fits tightly with motor after-frame bottom bonnet;
Boss is located at bonnet bottom centre and axially inner side extends in main yoke inner diameter volume, and protrude for inner side and have central shaft hole, be the structure of circular groove outside it, this groove has an opening that sensing component can be installed by bonnet bottom outside; Secondary yoke is closely fixed on the axially extended axle supporting base of motor after-frame, and the two and combine closely with the outer side surface of axis hole and form the high support strength support of boss, the support of stationary axle height support strength can be given;
Sensor system includes secondary group of magnets and sensing component,
The quantity of secondary group of magnets is identical with main magnet group; One end bottom bonnet of the main yoke internal diameter that secondary group of magnets system is installed on motor rotor and installing back to main magnet, its pole orientation is contrary with main magnet group, encapsulates to avoid liquid to corrode together with motor rotor; The axial length of secondary magnet is that rotor axial displacement length contains bearing shaft to more than two times that wear away; Its magnetic line of force is penetrated by secondary magnet surface and arrives secondary yoke through air gap, then gets back to and other originally adjacent secondary magnet via secondary yoke, and gets back to original secondary magnet via main yoke and form airtight sensing magnetic circuit; Make both main magnetic circuits magnetic line of force sensing magnetic circuit and main magnet coexist in main yoke, namely the magnetic line of force of sensor through main yoke but without interruption;
Sensing component system includes secondary yoke and plural inductive component, and sensing component system is installed in the ring-like secondary yoke surface of magnetic conductivity sensing component and becomes an assembly through insulation material package, and is installed in the circular groove of boss bottom bonnet; Secondary yoke internal diameter and axle supporting base external diameter fit tightly fixing; And the trailing edge of secondary yoke is provided with an electrical angle locating point, this locating point system links the axle center locating point of the axle supporting base of motor after-frame, and links the electrical angle locating point of motor stator coils winding; The axial front and rear edge axially mobile axial range that all can not exceed secondary yoke of secondary magnet; Each sensing component cutting magnetic line under motor rotor rotates can export induced voltage signal;
Stationary axle is bilateral support structure, be made up of the corrosion-resistant stupalith with abrasion performance, its front end is supported by tripod and is supported fixing with rear end by the boss axially stretched out, stationary axle is coupled for the rotation of support rotor with bearing, and its length meets the length of bearing to bear the composite force suffered by motor rotor;
Canned motor is made up of stator, motor center, motor after-frame and motor rotor;
Stator is fastening to be installed in motor center, it is wound with coil input PWM power supply can produce magnetic flux and be used for and rotor field interaction effect, make motor rotor produce moment of torsion and rotate and impeller output stream merit, the coil of stator avoids corrosion liquid by the protection of pumping bonnet and corrodes;
Motor center is fabricated metals, be used for tightly locking bonnet flange part and pump protecgulum at the flange of pumping side, to prevent the leakage of corrosion liquid, the rear flange of motor center is used for tightly locking motor after-frame to provide complete structure support force, makes the axle supporting base on motor after-frame can provide support force needed for stationary axle;
Motor after-frame is fabricated metals, is tightly locked in the rear flange of motor center pumping side, and the power line of motor stator coils is exported by power cable receives driving power;
Axle supporting base on motor after-frame is axial inner side extended structure, its outer ring surface is combined closely secondary yoke internal diameter, and the two and combine closely with the outer side surface of axis hole and form the high support strength support of boss, and provide the support force needed for stationary axle, grip length containing required axle;
Motor rotor is by main magnet group, main yoke, secondary group of magnets, the ring type structure that bearing and axial extension part are formed, be installed on bonnet room space, main magnet group is installed in main yoke outer ring surface equal angles, the quantity of secondary group of magnets is identical with main magnet group, secondary group of magnets system is installed on main yoke internal diameter one end bottom bonnet of motor rotor, and install back to main magnet, its pole orientation is contrary with main magnet group, the ring-type encapsulate that motor rotor is stitched by the coated all-in-one-piece zero leakage of corrosion resistant engineering plastics, the intermediate hole of rotor is equiped with the composite force that ceramic bearing is used for being coupled with stationary axle to bear suffered by rotor, impeller boss is combined with the axial extension part of motor rotor, impeller is integrally formed with motor rotor, or the two mutually embeds and is combined into one,
The inner diameter volume of main yoke can be held secondary magnet and be installed in bonnet bottom centre and the axle supporting base of the boss extended inside axis and after-frame, and is equiped with sensing component in the circular groove of boss.
4. a permanent magnetism canning pump structure, permanent magnetism canning pump is for there being the cantilever Relationship for Compound-Axis Structure of the monolateral support of sensor, and major part includes: pump protecgulum, impeller, bonnet, sensor, stationary axle and canned motor, is characterized in that: wherein,
An entrance, outlet and a flow channel space is covered with before pump, be used for holding impeller, the runner that the entrance of pump protecgulum entrance and impeller becomes a level and smooth flaring does not have other obstacle, pump protecgulum is metal casting pot body, criticize in it and be covered with anticorrosive plastic liner, be provided with an entrance thrust ring in ingress inside it, being used for is coupled with the impeller thrust bearing of impeller eye side forms axial thrust bearing jointly;
It is inner that impeller is installed in pump protecgulum, impeller boss is used for being combined with the axial extension part of motor rotor, impeller is integrally formed or the two mutually embeds and is combined into one with motor rotor, the perforate of impeller boss plate central authorities of impeller hub bore system one is used for allowing circulating liquid reflux, the runner that the entrance of pump protecgulum entrance and impeller becomes a level and smooth flaring does not have other obstacle, and the shape of impeller boss plate is also smooth surface;
Bonnet is a cup-shaped shell construction, and the boss structure of a perforate is arranged at bottom, and the flange part of its front end, in conjunction with the center flange of pump protecgulum and motor, is used for preventing the leakage of corrosion liquid; The cylindrical part of bonnet side, through the internal diameter of stator, is slip loose fit therebetween, and fits tightly with motor after-frame bottom bonnet;
Boss is located at bonnet bottom centre and axially inner side extends in main yoke inner diameter volume, protrude for inner side and there is center hole, relatively become inward recess outside it, the ring surface of inward recess is equiped with sensing component, and secondary yoke internal diameter is arranged on axle supporting base outer ring surface; The through hole at boss center is used for installing stationary axle, and the sealing surface of boss seals by with the end face of shaft bush of O type ring and the axle supporting base packing of motor after-frame, to guarantee that bonnet does not have any leakage and produces;
Sensor system includes secondary group of magnets and sensing component,
The quantity of secondary group of magnets is identical with main magnet group; Secondary group of magnets system is installed on main yoke internal diameter one end bottom bonnet of rotor, and installs back to main magnet, and its pole orientation is contrary with main magnet group, encapsulates to avoid liquid to corrode together with rotor; The axial length of secondary magnet is that rotor axial displacement length contains bearing shaft to more than two times that wear away; Its magnetic line of force is penetrated by secondary magnet surface and arrives secondary yoke through air gap, then gets back to and other originally adjacent secondary magnet via secondary yoke, and gets back to original secondary magnet via main yoke and form airtight sensing magnetic circuit; Make both main magnetic circuits magnetic line of force sensing magnetic circuit and main magnet coexist in main yoke, namely the magnetic line of force of sensor through main yoke but without interruption;
Sensing component system includes secondary yoke and plural inductive component, and sensing component system is installed in the ring-like secondary yoke surface of magnetic conductivity sensing component and becomes an assembly through insulation material package, and is installed in the ring surface of the inward recess of boss bottom bonnet; Secondary yoke internal diameter is fixed on axle supporting base external diameter; And the trailing edge of secondary yoke is provided with an electrical angle locating point, this locating point system links the axle center locating point of the axle supporting base of motor after-frame, and links the electrical angle locating point of motor stator coils winding; The axial front and rear edge axially mobile axial range that all can not exceed secondary yoke of secondary magnet; Each sensing component cutting magnetic line under rotor turns can export induced voltage signal;
To be cantilever structure be made up of corrosion-resistant Ceramic shaft sleeve, metal shaft and motor after-frame with abrasion performance stationary axle, and jointly form complete axle sealing system with bonnet, one end of stationary axle can obtain required support strength when being installed in the axle supporting base of motor after-frame, stationary axle is coupled for the rotation of support rotor with bearing, and its length meets the length of bearing to bear the composite force suffered by rotor;
Metal shaft is through the center hole of Ceramic shaft sleeve, and the front-end face of Ceramic shaft sleeve is pressed on the one end with rounded nose, the axis extension boss of spiro tooth part through bonnet of metal shaft and the center through hole of axle supporting base, and be tightly locked on motor after-frame with nut, make Ceramic shaft sleeve thrust ring portion be pressed on the end face of axle supporting base, the rounded nose of metal shaft, then with plastic, rubber-coating, which is provided with O type ring to reach the anti-corrosion function of sealing;
The thrust ring portion of Ceramic shaft sleeve is used for being coupled mutually with rotor bearing forming liquid hydrodynamic thrust bearing, the end face of the end face of thrust ring portion and the axle supporting base of motor after-frame tightly locks compression, the sealing surface of the two middle also packing boss, and sealed by the thrust ring end surface with O type ring, how to leak generation to guarantee that bonnet does not have;
Axle supporting base on motor after-frame is combined closely the boss of bonnet bottom centre, and provide the support force needed for stationary axle to comprise required axle gripping length, when metal shaft is tightly locked on motor after-frame with nut, the biend of Ceramic shaft sleeve is tightly pushed down by the end face of the rounded nose of metal shaft and axle supporting base, and forms the combined type stationary axle of a high rigidity;
Canned motor is made up of stator, motor center, motor after-frame and motor rotor;
Stator is fastening to be installed in motor center, it is wound with coil input PWM power supply can produce magnetic flux and be used for and rotor field interaction effect, make rotor produce moment of torsion and rotarily drive impeller output stream merit, the coil of stator avoids corrosion liquid by the protection of pumping bonnet and corrodes;
Motor center is fabricated metals, be used for tightly locking bonnet flange part and pump protecgulum at the flange of pumping side, to prevent the leakage of corrosion liquid, the rear flange of motor center is used for tightly locking motor after-frame to provide complete structure support force, makes the axle supporting base on motor after-frame can provide support force needed for composite solid dead axle;
Motor after-frame is fabricated metals, is tightly locked in the rear flange of motor center pumping side, and the power line of motor stator coils is exported by power cable receives driving power;
The outer ring surface of the axle supporting base on after-frame is equiped with sensing component, to combine closely the boss of bonnet bottom centre, and provide the support force needed for stationary axle to comprise required axle gripping length, the end face of the end face of axle supporting base and the thrust ring portion of Ceramic shaft sleeve tightly locks compression, the sealing surface of the two middle also packing boss, and sealed by the thrust ring end surface with O type ring, how to leak generation to guarantee that bonnet does not have;
Motor rotor is by main magnet group, main yoke, secondary group of magnets, the ring type structure that bearing and axial extension part are formed, be installed on bonnet room space, main magnet group is installed in main yoke outer ring surface equal angles, the quantity of secondary group of magnets is identical with main magnet group, secondary group of magnets system is installed on main yoke internal diameter one end bottom bonnet of motor rotor, and install back to main magnet, its pole orientation is contrary with main magnet group, the ring-type encapsulate that motor rotor is stitched by the coated all-in-one-piece zero leakage of corrosion resistant engineering plastics, the intermediate hole of motor rotor is equiped with the composite force that ceramic bearing is used for being coupled with stationary axle to bear suffered by rotor, impeller boss is combined with the axial extension part of motor rotor, impeller is integrally formed with motor rotor, or the two mutually embeds and is combined into one,
The inner diameter volume of main yoke can be held secondary magnet and be installed in bonnet bottom centre and the axle supporting base of the boss extended inside axis and after-frame, and is equiped with sensing component in the circular groove of boss.
5. permanent magnetism canning pump structure as claimed in claim 1 or 2 or 3 or 4, it is characterized in that: wherein, the bearing of canned motor is coupled for the rotation of support rotor with stationary axle, and its length meets the composite force suffered by rotor; Wherein, the main yoke length energy fitted bearing length of motor rotor and lengthening, bears high capacity running to meet pumping.
6. permanent magnetism canning pump structure as claimed in claim 1 or 2 or 3 or 4, it is characterized in that: wherein, boss supported by the axle supporting base of after-frame, its axial extension system by bottom bonnet to axis hole opening only, axial extension is more than 0.5 times of the diameter of axle.
7. permanent magnetism canning pump structure as claimed in claim 1 or 2 or 3 or 4, it is characterized in that: wherein, the axle supporting base of motor after-frame can provide the length of the gripping needed for stationary axle, is fixed on the total length after on axle supporting base containing secondary yoke, and it grips more than 0.6 times that length is the diameter of axle.
8. a permanent magnetism canning pump structure, the structural rigidity that object is promoting stationary axle also can install sensor, it is characterized in that: wherein can install sensor system and reach by increasing rotor main yoke inner diameter volume, motor is made up of stator, motor center, motor after-frame and motor rotor;
Stator is fastening to be installed in motor center, it is wound with coil input PWM power supply and can produces magnetic flux and be used for and rotor field interaction effect, make rotor produce moment of torsion and rotarily drive impeller output stream merit;
Motor center is fabricated metals, and the rear flange of motor center is used for tightly locking motor after-frame to provide complete structure support force, makes the axle supporting base on motor after-frame can provide support force needed for stationary axle;
Motor after-frame is fabricated metals, is tightly locked in the rear flange of motor center pumping side; The outer ring surface of the axle supporting base on motor after-frame can install sensing component;
Motor rotor is the ring type structure be made up of main magnet group, main yoke, secondary group of magnets, bearing and axial extension part, main magnet group is installed in main yoke outer ring surface, the quantity of secondary group of magnets is identical with main magnet group, the main yoke internal diameter that secondary group of magnets lies in motor rotor is installed back to main magnet, and pole orientation is contrary with main magnet group, the ring-type encapsulate that motor rotor is stitched by the coated all-in-one-piece zero leakage of corrosion resistant engineering plastics; The inner diameter volume of main yoke can hold the axle supporting base of the motor after-frame that secondary magnet extends with axial inner side, and axle supporting base external diameter surface can be equiped with sensing component.
9. permanent magnetism canning pump structure as claimed in claim 8, is characterized in that: wherein, and the axis inner side extended length system of axle supporting base is counted by the end of main yoke near motor after-frame, and axial extension is more than 0.5 times of the diameter of axle.
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