CN105604136A - Constant-pressure non-negative pressure water supplying unit adopting permanent magnet synchronous motors - Google Patents
Constant-pressure non-negative pressure water supplying unit adopting permanent magnet synchronous motors Download PDFInfo
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- CN105604136A CN105604136A CN201510662433.8A CN201510662433A CN105604136A CN 105604136 A CN105604136 A CN 105604136A CN 201510662433 A CN201510662433 A CN 201510662433A CN 105604136 A CN105604136 A CN 105604136A
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Abstract
The invention provides a constant-pressure non-negative pressure water supplying unit adopting permanent magnet synchronous motors. The constant-pressure non-negative pressure water supplying unit adopting the permanent magnet synchronous motors, provided by the invention, has the beneficial effects that the permanent magnet synchronous motors are adopted; when only one pump motor exists or two pump motors exist, variable frequency drivers are adopted to match with variable frequency driving permanent magnet synchronous motors; when two or more pump motors exist, a pump of one variable frequency driving permanent magnet synchronous motor is adopted as a main pump, several other motors which are used as auxiliary pumps adopt asynchronous starting permanent magnet synchronous motors, and a power-frequency power supply is directly used for supplying power, so that the trouble that common permanent magnet synchronous motors need mated variable frequency drivers is omitted, the cost is reduced, and the efficiency is increased; according to the scheme, the application problem of the permanent magnet synchronous motors on configuration of constant-pressure non-negative pressure multi-pump water supplying devices is solved, asynchronous motors in the constant-pressure non-negative pressure water supplying unit can be comprehensively replaced with the permanent magnet synchronous motors, and the maximum energy saving effect of the constant-pressure non-negative pressure water supplying unit can be achieved.
Description
Technical field
The invention belongs to water supplying machine technical group field, refer in particular to a kind of permagnetic synchronous motor constant voltage non-negative pressure method of water supply machineGroup.
Background technology
Along with improving constantly of living standards of urban and rural residents level, city and quelling, small city high building are more and more, buildingThe supply equipment of space is also in continuous renewal. The large portion of water supply of city building is all used permanent pressing non-negative-pressure at presentPump assembly supplies water, and adopts vector frequency converter to drive threephase asynchronous machine, by each group of pressure sensor, to enteringOutlet pipeline carries out constant voltage control, realizes the automation of building constant pressure water supply. Although this class unit is more single pump than in the pastThe efficiency that machine supplies water has improved a lot, but because the motor adopting is threephase asynchronous machine, is not efficientPermagnetic synchronous motor, therefore efficiency also has larger room for promotion.
Summary of the invention
The object of this invention is to provide a kind of full-automatic, safe and reliable, frequency conversion drive permanent magnetism that operating efficiency is highThe constant voltage non-negative pressure method of water supply machine of the centrifugal pump of synchronous motor and the combination of the centrifugal pump of line-start permanent magnetic synchronous motorGroup.
The object of the present invention is achieved like this:
Permagnetic synchronous motor constant voltage non-negative pressure method of water supply unit, comprises steady-flow tank, and the top of steady-flow tank is provided with pressurePower sensor and negative pressure canceller, be also provided with water inlet end and water side on steady-flow tank, water inlet end is provided with negativePress table, water side connects the house steward's I of confluxing, and a side of the house steward's I of confluxing is provided with the house steward's II of confluxing, and convergesStream house steward's I and the branch road being arranged in parallel by several between house steward's II that confluxes are communicated with, in each branch roadPortion is all in series with water pump and stop valve, and the house steward's II of confluxing connects the user mouth of a river; Described water pump comprises a masterPump and some auxiliary pumps, described main pump is the centrifugal pump of frequency conversion drive permagnetic synchronous motor, described auxiliary pump comprises oneThe centrifugal pump of individual above line-start permanent magnetic synchronous motor; Described frequency conversion drive permagnetic synchronous motor fromHeart pump is equipped with variable frequency drives, described pressure sensor to be connected with variable frequency drives respectively, variable frequency drivesGenerally be placed in switch board. Described line-start permanent magnetic synchronous motor does not need variable frequency drives operation.
Described auxiliary pump is the centrifugal pump of a frequency conversion drive permagnetic synchronous motor; Or, described auxiliary pump be one differentThe centrifugal pump of step starting and permanent magnet synchronous motor; Or described auxiliary pump is that two above asynchronous starting and permanent magnets are synchronousThe centrifugal pump of motor.
The synchronous centrifugal pump of described asynchronous starting and permanent magnet comprises the pump housing and motor, and the rotor of motor comprises and being arranged inThe rotating shaft of the heart and be enclosed within the rotor core in rotating shaft, rotor core is axially folded by multiple circular silicon steel sheet rotating shaftsAdd and form, described rotor core be circumferentially inserted with uniformly multiple sliver windings, all sliver windings surroundOne circular cage-shaped structure; On rotor core, be also provided with one group or two groups or permanent magnet more than two, foreverMagnet is symmetricly set on rotating shaft week side become up and down with circular mouse cage or mix overlappingly, and permanent magnet is at rotor coreOn radial section, form one group or two groups along this opposite pole symmetrical to permanent magnet radial centre lines.
Described epitrochanterian circular mouse cage is cast aluminium or copper, and permanent magnet is built in circular mouse cage.
Described permanent magnet comprises first order permanent magnet and second level permanent magnet, and first order permanent magnet is arranged on adjacentTwo sliver windings between, sliver winding between two adjacent first order permanent magnets inner side arranges to some extentState second level permanent magnet.
Described centrifugal pump is single-stage or multistage, vertical or horizontal, all kinds of centrifugal pumps of submersible type or land formula.
When described permanent magnet is built in rotor core, permanent magnet is built in rotor core according to level to number redial,Or tangential on board is in rotor core, or, radially and tangential interval mix and be built in rotor core; Forever describedMagnet is built on rotor core and is yi word pattern or V-type or U-shaped or W type.
The cross section of described sliver winding is rounded, pyriform, fall pyriform or other shapes.
Described permanent magnet comprises neodymium iron boron magnetic body, samarium-cobalt magnet and Ferrite.
In described switch board, be provided with variable frequency drives, the variable frequency regulating speed control circuit of variable frequency drives comprises letterNumber setup unit, A/D converting unit, data processing unit and D/A converting unit, A/D converting unit bagKuo Yi road external digital or input end of analog signal, external digital or input end of analog signal and described pressure passSensor connects, and data processing unit connects with signal sets unit, A/D converting unit, D/A converting unit;D/A converting unit has a numeral or analog signal output, the numeral of D/A converting unit or simulation letterNumber output is connected with frequency converter.
The centrifugal pump setting of described frequency conversion drive permagnetic synchronous motor also has two or three all to use frequency conversion driveThe pump of permagnetic synchronous motor, function also can realize, and the main frequency-variable controller still using is many, and cost increasesAdd.
The present invention compared to existing technology outstanding and useful technique effect is:
The present invention adopts permagnetic synchronous motor, in a pump motor or two pump motors, adopts variable frequency drivesAdd frequency conversion drive permagnetic synchronous motor, and when pump motor more than 2 or 2, adopt 1 frequency conversionDrive permagnetic synchronous motor, several pump motors adopt line-start permanent magnetic synchronous motor, asynchronous starting in additionPermagnetic synchronous motor operation do not need variable frequency drives, this programme solved permagnetic synchronous motor constant voltage withoutNegative pressure equipment configuration is upper, and a particularly application difficult problem for many pump motors can replace permagnetic synchronous motor comprehensivelyThe constant voltage non-negative pressure method of water supply of asynchronous machine frequency conversion, reaches maximum energy-saving effect.
Line-start permanent magnetic synchronous motor adds the one section of permanent magnet in surface in the space of circular cage-shaped structure, with circlePermanent magnet below shape cage-shaped structure becomes double-deck magnet structure, becomes the first permanent magnet and the second permanent magnet, circleShape cage-shaped structure mainly obtains starting torque, under the effect of stator coil rotating excitation field, and epitrochanterian permanent magnetismBody rotates immediately, in the time approaching the rotary speed of stator field, pulls in by permanent magnet. This is placed onPermanent magnet in the middle of sliver is because the position radius with respect to axle center is larger, and the moment that can play is larger, alsoHave magnet steel more to approach rotor surface, magnetic is close just larger, and permanent magnet is to obtain the needed torque of pulling in,Two aspects are fully taken into account, and make motor fully obtain larger starting torque and enough torques of pulling in. ThisStructure also can be used in conjunction with other combinations of legend, forms asynchronous starting and permanent magnet run-in synchronism motor.
The pump that the motor of line-start permanent magnetic synchronous motor forms and the efficient asynchronous machine of existing employingPump is compared, and its electric efficiency can also improve 5-7%, and the unit efficiency of pump is corresponding raising also, asynchronous startingThe synchronous stable speed function of permagnetic synchronous motor, can make pump in the time of grid voltage change and load variation, make pumpLift and flow remain unchanged. Also can be applicable to and do not join that all pumps of frequency converter are vertical or horizontal, single-stageOr on multistage centrifugal pump, realize efficient, stable work.
Brief description of the drawings
Fig. 1 is structure diagram of the present invention.
Fig. 2 is the structure diagram of steady-flow tank of the present invention.
Fig. 3 is the schematic diagram of variable frequency regulating speed control circuit of the present invention.
Fig. 4 is the structure diagram of the centrifugal pump of permanent-magnet synchronous of the present invention.
Fig. 5 is one of permanent magnet scheme of installation of the synchronous centrifugal pump of asynchronous starting and permanent magnet.
Fig. 6 be the synchronous centrifugal pump of asynchronous starting and permanent magnet permanent magnet scheme of installation two.
Fig. 7 be the synchronous centrifugal pump of asynchronous starting and permanent magnet permanent magnet scheme of installation three.
Fig. 8 be the synchronous centrifugal pump of asynchronous starting and permanent magnet permanent magnet scheme of installation four.
Fig. 9 be the synchronous centrifugal pump of asynchronous starting and permanent magnet permanent magnet scheme of installation five.
Figure 10 be the synchronous centrifugal pump of asynchronous starting and permanent magnet permanent magnet scheme of installation six.
Figure 11 be the synchronous centrifugal pump of asynchronous starting and permanent magnet permanent magnet scheme of installation seven.
Figure 12 be the synchronous centrifugal pump of asynchronous starting and permanent magnet permanent magnet scheme of installation eight.
Figure 13 be the synchronous centrifugal pump of asynchronous starting and permanent magnet permanent magnet scheme of installation nine.
In figure: 1-impeller; 2-motor; 3-rotating shaft; 4-rotor core; 5-sliver winding; 6-air is every magneticGroove; 7-permanent magnet; 8-the second permanent magnet; 9-first order permanent magnet; The 10-pump housing; 11-stator;
12-negative pressure canceller; 13-water inlet end; 14-water supply connector; 15-constant voltage chamber; 16-pressure stabilizing cavity; 17-Tank body; 18-leg; 19-bypass pipe; 20-water out adapter; 21-water side; 22-pipeline; 23-leg;
30-switch board; 31-pressurized tank; 32-base; The 33-house steward's I of confluxing; 34-frequency conversion drive permanent-magnet synchronousThe centrifugal pump of motor; 35-branch road; The 36-house steward's II of confluxing; 37-motor; 38-asynchronous starting and permanent magnet synchronous electricThe centrifugal pump of machine; The delivery port of 39-centrifugal pump; The water inlet of 40-centrifugal pump.
Detailed description of the invention
Below in conjunction with accompanying drawing, with specific embodiment, the invention will be further described:
Permagnetic synchronous motor constant voltage non-negative pressure method of water supply unit, comprises steady-flow tank, and the top of steady-flow tank is provided with pressurePower sensor and negative pressure canceller 12, be also provided with water inlet end 13 and water side, water inlet end setting on steady-flow tankHave vacuum table, water side connects the house steward's I of confluxing, and a side of the house steward's I of confluxing is provided with the house steward's II of confluxing,The house steward's I of confluxing and the branch road being arranged in parallel by several between house steward's II that confluxes are communicated with, each branch roadMiddle part is all in series with water pump and stop valve, and the house steward's II of confluxing connects user's water inlet; Described water pump comprises oneThe centrifugal pump of individual frequency conversion drive permagnetic synchronous motor and more than one line-start permanent magnetic synchronous motor centrifugalPump, the centrifugal pump of described frequency conversion drive permagnetic synchronous motor is equipped with transducer driver, and described pressure passesSensor, negative pressure canceller are connected with frequency-variable controller respectively.
Described auxiliary pump is the centrifugal pump of a line-start permanent magnetic synchronous motor; Or, described auxiliary pump be two withOn the centrifugal pump of line-start permanent magnetic synchronous motor. Or described auxiliary pump is a frequency conversion drive permanent-magnet synchronousThe centrifugal pump of motor.
The parameters such as several pump rated head flows of unit are the same, and the pump of the permagnetic synchronous motor of frequency conversion drive is doneFor conventional main pump. In pump operation process, pressure sensor passes the hydraulic pressure that the signal of coming and controller are setPower numeric ratio, drives pump motor through driver procedure, and automatically regulates suitable rotating speed operation, makes pumpThe pressure that impeller moves under this speed is just meeting the pressure requirement of setting. Reach after maximum at flow,Flow continues demand, in the time wanting this critical value, starts second pump, if this pump motor is also frequency conversionDrive permagnetic synchronous motor time, simultaneously frequency conversion of two pumps, keeps the pressure of water constant.
If second permagnetic synchronous motor that pump is asynchronous starting starting, the program of this frequency converter soDifferent again, reach after maximum at flow, flow continues demand, in the time wanting this critical value, frequency conversionThe program of controller starts the permagnetic synchronous motor of another asynchronous starting by port controlling A.C. contactor,The power supply of the permagnetic synchronous motor of this asynchronous starting be can't help frequency converter and is supplied with, but is directly switch to power frequency fortuneOK, reach maximum speed once starting, due to the rising of loine pressure value, the rotating speed of the main pump of VFCAgain can fast-descending, drop to the requirement of gross pressure, keep the pressure of pipeline constant. If in discharge demandRise above after the maximum of two pumps, just as principle above, start the 3rd pump. Reduce at water consumptionTime, also shut down one by one by this principle.
In order to keep the basicly stable of pump pressure, adopt force value and downforce value arranging of force valueTwo numerical value, there is a wider difference centre, pump motor is started shooting in the time reaching downforce value, to upperWhen force value, shut down, be unlikely to second (or the 3rd pump motor) frequent starting start or shut down.
Adopt constant voltage non-negative pressure method of water supply device and the common vector frequency converter of permagnetic synchronous motor to join phase asynchronous electricityThe constant voltage non-negative pressure method of water supply of machine is compared, and controls function and using method all substantially the same, is exactly mainly unit effectRate is different. Reason is that the efficiency of threephase asynchronous machine is original just confidential low than permanent magnet synchronous electric, uses frequency conversionWhen device is powered to asynchronous machine, current waveform does not have civil power power frequency waveform good, and the loss of electric machine will increase by 2%, then addsWant the loss approximately 3% of vector frequency converter itself, in other words, with after inverter supply, the efficiency of asynchronous machineAlso can decline approximately 5%, under calculating like this, use the pump assembly of synchronous motor just than the pump overall efficiency with asynchronous machineWant high 10% left and right. 10% energy-saving effect is very significant. This is that the efficiency of machine operation in the time of rated point is poorDistance.
The pump motor most of the time is operated in non-rated point, the efficiency of non-rated point than motor at rated pointEfficiency is low. Permanent magnet synchronous electric engine efficiency aspect, shows with regard to the experiment of the motor of 7.5KW, at rated power20% efficiency that has > 80% when above, when 10% rated power, efficiency has the specified merit of > 70%, 3%When rate, having the efficiency of > 60%, is all high efficiency in whole power section, and the efficiency of the each power points of asynchronous machine allFar less than the efficiency of permagnetic synchronous motor, differ especially large in the efficiency of the low speed segment of frequency conversion, can differ and reachMore than 15-20%.
The pump of permagnetic synchronous motor also has good performance, be exactly synchronous motor be exactly the frequency of rotating speed and power supplyBe consistent, and the variation of supply voltage (in rated range) is irrelevant, the constant lift that just means of rotating speedFlow held stationary is constant. If asynchronous machine, at full load, when supply voltage declines, can be madeBecome rotating speed to decline, reduce and make lift reduce flow. This is particularly useful for need the occasion of current stabilization at some.
The below of described steady-flow tank is provided with blowoff valve.
Steady-flow tank comprises that inside has tank body 17 and the inner pipeline 22 with constant voltage chamber 15 of pressure stabilizing cavity 16,The end of pipeline 22 has the water inlet end 13 and the water side 21 that are communicated with constant voltage chamber 15, water side 21 straightFootpath is less than the diameter in constant voltage chamber 15. At water inlet end, 13 places are welded with water supply connector 14, in water side 21 places welderingBe connected to water out adapter 20.
Pipeline 22 vertically arranges, and water inlet end 13 is positioned at the upper end of pipeline 22, and water side 21 is positioned at pipeline 22Lower end, between pipeline 22 and tank body 17, be provided with the bypass pipe for being communicated with pressure stabilizing cavity 16 and constant voltage chamber 1519, the junction of bypass pipe 19 and tank body 17 is positioned at the bottom of tank body 17, bypass pipe 19 and pipeline 22Junction is positioned at the below of tank body 17, and the top of tank body 17 is provided with the negative pressure canceller being communicated with pressure stabilizing cavity 1612。
The water inlet end 13 of pipeline 22 is connected with city planting ductwork, and water side 21 is connected with booster pump group. Positive reasonUnder condition, booster pump group directly by constant voltage chamber 15 to the water supply of pressurizeing of the water of city planting ductwork, bypass pipe 19The water in constant voltage chamber 15 is guided in pressure stabilizing cavity 16, and by the gas compression in pressure stabilizing cavity 16 to pressure stabilizing cavity 16In the negative pressure canceller 12 of top. When causing constant voltage chamber 15 internal pressures, city planting ductwork water pressure fluctuations changes shadowWhile ringing booster pump group normal water supply, the water in pressure stabilizing cavity 16 by the air in negative pressure canceller 12 by voltage stabilizingWater in chamber 16 is forced in constant voltage chamber 15, ensures pump group normal water supply.
Pipeline 22 is vertically arranged in the middle part of tank body 17.
Wherein, tank body 17 is tubular and horizontal positioned, and bypass pipe 19 is positioned at tank body with the junction of tank body 1717 lowest part, is provided with leg 18,23 in the bottom of tank body 17.
This steady-flow tank be specially adapted to building in supplying water without negative pressure equipment, at maximum performance steady-flow tankAutomatically regulate and supply water simultaneously, fully ensured that steady-flow tank is inner isolated with air, avoid waters air contact,Assure feed water safe and sanitary.
The synchronous centrifugal pump of described asynchronous starting and permanent magnet comprises the pump housing 10 and motor 2, and motor comprises stator and turnsSon, described stator and the stator of threephase asynchronous machine are basic identical, and described rotor comprises and is positioned at turning of centerAxle 3 and be enclosed within the rotor core 4 in rotating shaft, rotor core be by multiple circular silicon steel sheet rotating shafts axially stack andBecome, described rotor core be circumferentially inserted with uniformly multiple sliver windings 5, all sliver windings 5 surround oneCircular cage-shaped structure;
On rotor core, be provided with one group or two groups of permanent magnets 7, permanent magnet is symmetricly set on 3 weeks sides of rotating shaft alsoBecome up and down with circular mouse cage or mix overlappingly, permanent magnet 7 forms one group or two on rotor core radial sectionGroup is along this opposite pole symmetrical to permanent magnet radial centre lines.
Described centrifugal pump is single-stage or multistage, vertical or horizontal, all kinds of centrifugal pumps of submersible type or land formula.
Circular mouse cage cast aluminium or copper that described sliver winding 5 forms, permanent magnet is built in circular mouse cage.
The cross section of described sliver winding is circle, pyriform, fall pyriform or other shapes; On rotor coreThe notch that holds described sliver winding is open slot or enclosed slot.
Described permanent magnet is for being built in rotor core or being attached to rotor core surface.
When described permanent magnet is built in rotor core, permanent magnet is radially built in rotor core, or, permanent magnetTangential on board is in rotor core, or as shown in figure 13, permanent magnet is radially built in and turns with the mixing of tangential intervalSub-iron core.
Described permanent magnet comprises neodymium iron boron magnetic body, samarium-cobalt magnet, Ferrite and and other magnetic materials.
In described switch board, be provided with variable frequency regulating speed control circuit, variable frequency regulating speed control circuit comprises signal setsUnit, A/D converting unit, data processing unit and D/A converting unit, A/D converting unit comprises a roadExternal digital or input end of analog signal, external digital or input end of analog signal and described pressure sensor connectConnect, data processing unit connects with signal sets unit, A/D converting unit, D/A converting unit; D/AConverting unit has a numeral or analog signal output, and numeral or the analog signal of D/A converting unit are defeatedGoing out end is connected with frequency converter.
As another kind conversion, described permanent magnet is yi word pattern as shown in Figure 8 or V-type as shown in figure 10Or W type U-shaped or as shown in figure 12 is as shown in figure 11 built in rotor core.
As shown in Figure 5, described permanent magnet comprises first order permanent magnet 9 and second level permanent magnet 8, and the first order foreverMagnet 9 is arranged between two adjacent sliver windings 5, leading between two adjacent first order permanent magnetsBar winding inner side is provided with described second level permanent magnet 8.
Described line-start permanent magnetic synchronous motor stator winding is the sinusoidal wave distributed winding distributing. DistributeThe distributed winding of the stator structure of the three-phase synchronous motor of formula winding and ordinary three-phase synchronous is substantially poorMany, stator can be selected by common Y-series stator punching, and line bag insulator pin etc. are processed all with common three differentStep motor is the same. But the rotor of motor is different, this rotor extexine has the squirrel-cage bar of cast aluminium (or copper),There is magnet steel the inside. The rotor of old-fashioned three-phase or monophase machine is die casting aluminium ring in tooth window bar, and aluminium ring is to closeClose loop, in stator field, make cutting magnetic line and rotatablely move, along with stator field rotation and rotate,All the time the rotation that is slower than magnetic field forms asynchronous machine. The rotor of this die casting aluminium often loss is larger, generally accounts for5-7% of total losses, and the rotor that this product uses is squirrel-cage bar and magnet double-decker, squirrel-cage bar isAction use, after starting, permanent magnet is with the rotating excitation field rotation of stator line, and revolve in the magnetic field that approaches soon stator coilWhen rotary speed, after the pulsating torque of permanent magnet is pulled in rotor, the rotary synchronous in squirrel-cage bar and magnetic field,No longer produce magnetic force, substantially no longer include electric current and produce, thereby also no longer include the asynchronous machine eddy current in when workLoss, again because the wire circle of magneto reduces than asynchronous machine, conductive wire cross-section is long-pending to be increased, resistance valueAlso little, copper cash loss also reduces, and therefore overall loss is few more a lot of than asynchronous machine. Therefore asynchronous starting foreverThe efficiency of magnetic-synchro motor also will raise the efficiency 5-7% than the motor of the efficient YE3 of three-phase, than common Y2, Y3Motor is raised the efficiency 8-15%.
When the rotating speed of line-start permanent magnetic synchronous motor pull in reach stable after, squirrel-cage bar no longer produces electricityStream, ineffective, if continuing to increase, motor load arrives the torque losing when synchronous pull-out torque, thisTime motor will significantly rise until shut down by electric current. This pull-out torque conventionally than the twice of specified power orAbove, overload capacity also exceedes common asynchronous machine. When machine operation is within the scope of the rated power of designOperation, adds variously as safeguard measures such as overcurrents, just there will not be this possible. Asynchronous starting foreverMagnetic-synchro machine operation in the time that rated power is interval, owing to thering is net synchronization capability, in the time having load variations, itRotating speed can keep with the Frequency Synchronization of power supply and the variation that can not produce rotating speed. This make pump mix thisAfter synchronous motor, when variation that pump declines at load variations or supply voltage, pump can keep lift and flowConstant. This is to keeping the stable and don't valuable especially function during with the pump of frequency converter of pump discharge lift.
Above-described embodiment is only preferred embodiment of the present invention, not limits the scope of the invention according to this,Therefore: all equivalences of doing according to structure of the present invention, shape, principle change, and all should be covered by guarantor of the present inventionWithin protecting scope.
Claims (10)
1. permagnetic synchronous motor constant voltage non-negative pressure method of water supply unit, it is characterized in that, comprise steady-flow tank, the top of steady-flow tank is provided with pressure sensor and negative pressure canceller, on steady-flow tank, be also provided with water inlet end and water side, water side connects the house steward's I of confluxing, one side of the house steward's I of confluxing is provided with the house steward's II of confluxing, the house steward's I of confluxing and the branch road being arranged in parallel by several between house steward's II that confluxes are communicated with, the middle part of each branch road is all in series with booster water pump and stop valve, and the house steward's II of confluxing connects the user mouth of a river; Described water pump comprises a main pump and several auxiliary pumps, and described main pump is the centrifugal pump of frequency conversion drive permagnetic synchronous motor, and described auxiliary pump comprises the centrifugal pump of one or more line-start permanent magnetic synchronous motor; The centrifugal pump of described frequency conversion drive permagnetic synchronous motor is equipped with variable frequency drives, described pressure sensor to be connected with variable frequency drives respectively.
2. permagnetic synchronous motor constant voltage non-negative pressure method of water supply unit according to claim 1, is characterized in that, described auxiliary pump is the centrifugal pump of a line-start permanent magnetic synchronous motor; Or described auxiliary pump is the centrifugal pump of two above line-start permanent magnetic synchronous motors; Or, the centrifugal pump of a frequency conversion drive permagnetic synchronous motor of described auxiliary pump.
3. permagnetic synchronous motor constant voltage non-negative pressure method of water supply unit according to claim 1, it is characterized in that, the synchronous centrifugal pump of described asynchronous starting and permanent magnet comprises the pump housing and motor, the rotor of motor comprises and is positioned at the rotating shaft at center and is enclosed within the rotor core in rotating shaft, rotor core is to be axially formed by stacking by multiple circular silicon steel sheet rotating shafts, described rotor core be circumferentially inserted with uniformly multiple sliver windings, all sliver windings surround a circular cage-shaped structure; On rotor core, be also provided with one group or two groups of permanent magnets, permanent magnet is symmetricly set on rotating shaft week side become up and down with circular mouse cage or mix overlappingly, and permanent magnet forms one group or two groups along this opposite pole symmetrical to permanent magnet radial centre lines on rotor core radial section.
4. permagnetic synchronous motor constant voltage non-negative pressure method of water supply unit according to claim 3, is characterized in that, described epitrochanterian circular mouse cage is cast aluminium or copper, and permanent magnet is built in circular mouse cage.
5. permagnetic synchronous motor constant voltage non-negative pressure method of water supply unit according to claim 3, it is characterized in that, described permanent magnet comprises first order permanent magnet and second level permanent magnet, first order permanent magnet is arranged between two adjacent sliver windings, and the sliver winding inner side between two adjacent first order permanent magnets is provided with described second level permanent magnet.
6. permagnetic synchronous motor constant voltage non-negative pressure method of water supply unit according to claim 4, is characterized in that, described centrifugal pump is single-stage or multistage, vertical or horizontal, all kinds of centrifugal pumps of submersible type or land formula.
7. permagnetic synchronous motor constant voltage non-negative pressure method of water supply unit according to claim 4, it is characterized in that, when described permanent magnet is built in rotor core, permanent magnet is built in rotor core according to level to number redial, or, tangential on board is in rotor core, or body radially mixes and is built in rotor core with tangential interval; Described permanent magnet is built on rotor core and is yi word pattern or V-type or U-shaped or W type.
8. permagnetic synchronous motor constant voltage non-negative pressure method of water supply unit according to claim 4, is characterized in that, the cross section of described sliver winding is rounded, pyriform, fall pyriform or other shapes.
9. permagnetic synchronous motor constant voltage non-negative pressure method of water supply unit according to claim 4, is characterized in that, described permanent magnet comprises neodymium iron boron magnetic body, samarium-cobalt magnet and Ferrite.
10. permagnetic synchronous motor constant voltage non-negative pressure method of water supply unit according to claim 1, it is characterized in that, in described switch board, be provided with variable frequency drives, the variable frequency regulating speed control circuit of variable frequency drives comprises signal sets unit, A/D converting unit, data processing unit and D/A converting unit, A/D converting unit comprises road external digital or an input end of analog signal, external digital or input end of analog signal are connected with described pressure sensor, and data processing unit connects with signal sets unit, A/D converting unit, D/A converting unit; D/A converting unit has a numeral or analog signal output, and the numeral of D/A converting unit or analog signal output are connected with frequency converter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565786A (en) * | 2017-10-17 | 2018-01-09 | 河南全新机电设备有限公司 | A kind of permagnetic synchronous motor |
| CN109610553A (en) * | 2018-10-31 | 2019-04-12 | 南方泵业智水（杭州）科技有限公司 | A kind of full frequency-changing water supply device of permanent magnet synchronous motor driving |
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| EP2597310A2 (en) * | 2011-11-24 | 2013-05-29 | Robert Bosch Gmbh | Method for operating a variable-speed adjustable pump |
| CN202694047U (en) * | 2012-04-16 | 2013-01-23 | 杭州锐方科技有限公司 | Multi-machine constant-pressure water supply control apparatus based on one-chip microcomputer control |
| CN103452865A (en) * | 2013-09-02 | 2013-12-18 | 浙江创美机电有限公司 | High-speed in-pipe pump |
| CN104594452A (en) * | 2014-12-25 | 2015-05-06 | 江苏水智乐自动化设备有限公司 | Tap water high and low pressure compensation equipment with automatic cleaning function |
| CN205421417U (en) * | 2015-10-08 | 2016-08-03 | 浙江创美机电有限公司 | PMSM constant voltage does not have negative pressure water supply unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107565786A (en) * | 2017-10-17 | 2018-01-09 | 河南全新机电设备有限公司 | A kind of permagnetic synchronous motor |
| CN107565786B (en) * | 2017-10-17 | 2023-08-11 | 河南全新机电设备有限公司 | Permanent magnet synchronous motor |
| CN109610553A (en) * | 2018-10-31 | 2019-04-12 | 南方泵业智水（杭州）科技有限公司 | A kind of full frequency-changing water supply device of permanent magnet synchronous motor driving |
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Application publication date: 20160525 |