CN203151350U

CN203151350U - Clearance tube motor

Info

Publication number: CN203151350U
Application number: CN 201220731093
Authority: CN
Inventors: 王永凡
Original assignee: LTI Drive Systems Shanghai Co Ltd
Current assignee: Kekong Industry Automation Equipment Shanghai Co ltd
Priority date: 2012-12-27
Filing date: 2012-12-27
Publication date: 2013-08-21
Anticipated expiration: 2022-12-27

Abstract

Disclosed in the utility model is a clearance tube motor that comprises a rotor, a stator, a clearance tube arranged between the rotor and the stator, and bearing devices. At least two bearing devices are separated from the rotor in the axial direction; and at least one bearing device is used as a bearing drive device. The bearing drive device includes a motor drive device and a magnetic bearing device and is used for driving the rotor; and the rotor can be suspended without any contact at the radial direction by the bearing drive device, wherein the bearing drive device is a bearing-free motor with a motor winding. Besides, a plurality of pole pairs P of motor windings and a plurality of pole pairs P+/-1 of control windings are arranged on the stator.

Description

A kind of gas tube motor

Technical field

The utility model belongs to a kind of component of machine technical field, relates in particular to a kind of gas tube that is positioned between rotor and stator.

Background technology

In actual applications, if having aggressive liquids or highly purified water in the pump, be essential with isolating fully between drive motors and the pump.Employed isolation method comprises gas tube motor or sealing motor in the known prior art.The characteristics of gas tube motor are gapped pipe between stator and rotor.Known bearing by hydrostatics or slip can suspend the rotor of gas tube motor.For example the gas tube motor has individual sliding bearing, and shortcoming is that the abrasive material material that contains in the liquid after short-time running can damage sliding bearing.In addition, the particulate matter of sliding bearing also can contaminated liquid.For example the gas tube motor has individual hydrostatic bearing, and its dry runnability is poor.And containing the liquid of volatile materials, the liquid that namely contains gas componant transmits very poor.

The utility model content

In order to overcome the defective that exists in the prior art, the purpose of this utility model is to provide a kind of more economic gas tube motor.

The utility model proposes a kind of gas tube motor, it is characterized in that, comprise: a rotor, one stator and be positioned at described rotor, gas tube between the stator and bearing arrangement, wherein at least two described bearing arrangements have certain space with described rotor in the axial direction, and at least one described bearing arrangement is in order to as a bearing drive unit, described bearing drive unit comprises a motor driver and a magnetic bearing device, be used for to drive described rotor and diametrically by the described bearing drive unit described rotor that contactlessly suspends, described bearing drive unit is the bearing-free motor of a translator winding, comprises on the described stator that some number of pole-pairs P and described winding comprise some number of pole-pairs P ± 1.

A nearlyer step ground, described bearing comprises a motor with described bearing drive unit and separates the magnetic bearing device of installing with one.Described rotor is an internal rotor or an external rotor.Described bearing arrangement is magnetic bearing device, and at least diametrically with the contactless suspension of described rotor.Described gas tube motor comprises that at least a transducer is in order to detect the position of described rotor, intermittently pipe is arranged between described transducer and described rotor, described transducer is based on the Magnetic Measurement principle, and described transducer is current vortex sensor or inductor transducer or Hall element.Described gas tube motor comprises an active magnetizing coil in order to influence the axial location of rotor, and described gas tube extends between described rotor and described active magnetizing coil.Described gas tube motor comprises a three-phase rotatory current control device, and described three-phase rotatory current control device is used for the described magnetic bearing device signal of feedback.

The utility model also proposes the pump that a kind of and above-mentioned gas tube electric drilling match uses, and it is characterized in that, described pump is used for fluid.

Satisfy this target especially needs gas tube motor comprise a rotor, a stator and be positioned at rotor and stator between gas tube; Wherein with regard to rotor, settle two bearing arrangements in the axial direction at least; And at least one bearing arrangement is formed by the bearing drive unit and comprises a motor driver and a magnetic bearing device simultaneously, just can use this bearing drive unit in order to drive rotor and to suspend diametrically to need not to contact.

In gas tube motor advantageous embodiments, for the fluid latter will be connected to conveyer, particularly be connected to a centrifugal pump.In further advantageous embodiments, by at least two magnetic bearing devices in the axial direction, the rotor of gas tube motor is that magnetic suspension need not contact.In further advantageous embodiments, a magnetic bearing device of gas tube motor is as a bearing drive unit, and it has comprised a motor driver and a magnetic bearing device.In a particularly advantageous embodiment, the bearing drive unit of gas tube motor is arranged in the bearing-free motor that stator has the motor winding as one, and the motor winding has some number of pole-pairs p and control winding that some number of pole-pairs p ± 1 is arranged.

According to the utility model can see the advantage of gas tube motor be rotor can be designed to have passive fully operating assembly and wherein coil be magnetic suspension or magnetic drive rotor, thereby so just the gapped pipe of energy separates with rotor.So the rotor magnetic suspension need not to contact and separate by gas tube and stator are airtight in the space of peritrochanteric.In this manner, can produce a gas tube pump, it has the space of suspend contactless rotor and a peritrochanteric to separate by gas tube and stator are airtight.Separate by sealing according to the utility model, the gas tube pump is suitable for, especially for the transmission of the high purity substance as the enzyme of water or biochemical process.The abrasive material material that contains chemicals according to the utility model also can transmit by using the gas tube pump, and contactless because rotor suspends, the abrasive material material just can not damage bearing arrangement like this.According to the utility model, the gas tube pump has fabulous dry runnability, even lack fluid or lack strong venting or the high volatile volatile fluid because the rotor magnetic suspension is contactless.

Description of drawings

Can describe in detail and appended graphic being further understood by following utility model about advantage of the present utility model and spirit.

Fig. 1 is the gas tube motor of symmetry arrangement and the A-A profile that is positioned at the centrifugal pump of center;

Fig. 2 is the profile of a kind of embodiment of gas tube motor of centrifugal pump of ining succession;

Fig. 3 is the gas tube motor of symmetry arrangement and the profile that is positioned at the centrifugal pump of center;

Fig. 4,5,6,7 is the further profile of the gas tube motor of the centrifugal pump of ining succession;

Fig. 8 be one as the structural representation of the embodiment of the magnetic journal bearing of one pole bearing.

Embodiment

Describe specific embodiment of the utility model in detail below in conjunction with accompanying drawing.

Fig. 2 is the profile of a kind of embodiment of gas tube motor of centrifugal pump of ining succession.Fig. 2 has shown a gas tube motor 1, and it has an external rotor 3 and is connected to centrifugal pump 2 by axle 9c.Centrifugal pump 2 sucks liquid by air admission hole 20 and makes it to flow to outlet 21 in the 24a direction toward the 24a direction and by impeller 22.Gas tube motor 1 and centrifugal pump 2 have a common rotational axis A.The stator 4 of gas tube motor 1 is at inside and 4a unshakable in one's determination that have individual magnetic conductive material (particularly iron) to form, is one deck tagger 11 on its surface, toward radially extending and by the mode that motor is used to the have electric conductor 12 of nuzzling therein.All taggers 11 form a stacked stator pack together.Arrange electric conductor 12 can produce rotary electromagnetic field in order to make outboard rotor 3 rotations like this.Stator 4 has a cylindrical aperture 4c to respond to roller bearing 10.In the running, centrifugal pump 2 produces the power that acts on the flow direction 24a and passes through an axle 9c, and 9a and roller bearing 10 are transferred in the stator 4.Hollow cylinder rotor 3 as external rotor be centered around stator 4 outer and around stator 4 axially extended inner surface permanent magnet 8 is housed.Also can set rotor 3 like this, namely induction machine or reluctance motor and stator 4 connect together.Near the terminal position of centrifugal pump 2, hollow cylinder rotor 3 has one to be connected to circular distal parts 3b on the 9c with drives impeller 22.In addition, rotor 3 can have a

hollow cylinder joint

9d, and 3b is connected to centrifugal pump 2 with the circular distal parts, and wherein the diameter of the embodiment center tap 9d in Fig. 2 is consistent with the overall diameter of rotor 3.

The shell of gas tube motor 1 and centrifugal pump 2 is common pressure casings 5.Gas tube motor 1 has a gas tube 18, and wherein at least 18 of liquid impermeable or gas tube 18 is trapped among the surface of rotor 4 or in the face of outside the thin slice 11 of rotor 3.This gas tube 18 is formed by the such alloy composition of metal, Hastelloy C22 or by corrosion resistant material.

Gas tube electric-

motor pump

1,2 form by this way, an opening 23 that is used for fluid passage is arranged, on liquid at first begins to be flowing in axial 7a between rotor 3 and the shell 5 from the high-pressure section of pump 2 like this, flow to then in the other direction, be on the axial 7b between rotor 3 and the stator 4, so just formed the Hydrodynamic journal bearing of rotor 3.Liquid flows to the axle of rotation A again, through radially to the axle of rotation A between stator 4 and the circular portion 3b, so at the reverse Hydrodynamic cod of formation rotor 3 between the one side of the end face of stator 4 and circular 3b.Liquid flows to a 9c by opening 9b and flow to the inlet side 20 of centrifugal pump 2 by hollow shaft 9c.Axle 9c has individual extension 9a, and roller bearing 10 makes it to be suspended among the cylinder perforate 4c of stator 4.Roller bearing 10 is essential, especially is used for starting centrifugal pump 2, and in view of during transmitting, the Hydrodynamic cod that produces between stator 4 and the circular 3b enough comes the power of compensating action on axially.

Rounded termination part 3b can be connected to a 9a, 9c does not have aperture 9b yet.Therefore gap 6a is full of liquid among the 6b, but flow direction 7a, and 7b is axial A.Rotor 3 has the hydrodynamic bearing effect like this, especially diametrically.

As shown, rotor 3 can be furnished with permanent magnet 8 or as a cage rotor or reluctance rotor.

Stator 4 can have cavity, for example on the electric conductor 12 on stator 4 ends.Such cavity can be filled or be filled with oil by the such inserts of casting resin, and the thin layer of liquid impermeable is also arranged on inserts like this.

Advantage according to the visible gas tube motor 1 of the utility model is actually the surface that fluid-tight thin slice 18 is positioned at cylinder shape stator 4.The load because thin slice 18 only is under pressure, it can be done very thinly and/or be made of the such elastomeric material of plastics.Gas tube motor 1 further advantage is to be flowing in gap 6a, 6b, and the liquid among the 6c can have very high pressure and not damage fluid-tight thin slice 18.Further advantage is that the iron core 4a of stator 4 also can make with pottery again, and the compression strength height of stator 4 and roller bearing 10 load-carrying properties are favourable like this.

Gas tube motor 1 has two bearing arrangement 30a that separate with determining deviation and two on axial A all be so-called bearing-free motor.Such bearing-free motor produces torque at rotor 3 driving directions and has also produced power to rotor 3 simultaneously diametrically, for contactless suspension rotor 3.The stator 4 of this bearing-free motor has the winding 12 of some number of pole-pairs p to produce torque and the additional next contactless suspension rotor 3 of control winding 12a, and wherein controlling winding 12a has some number of pole-pairs p ± 1.Integrated position transducer 15 is positioned on the stator 4, in order to measure rotor 3 with respect to the position of stator 4 and to be passed to control or adjusting device 40.The passage 4b of stator 4 receives electric conductor 13, begins to lead to winding 12 from

distributor

14,12a and transducer 15.The signal of measurement mechanism 45 receiving sensors 15 and feed-in control device 40, control device 40 can and be positioned at 14 pairs of windings of distributor 12 of back and

control winding

12,12a excitation by setting device or controller 41,42,43,44.

Electric-control system 40 receives value and the excitation control windings 12 of

transducer

15,12a, and the location-controlled of rotor 3 is in radially and/or axially, and rotor 3 is connected with centrifugal pump 2 magnetic suspensions that impeller is arranged also that energy freely rotate like this.Such magnetic bearing has superiority, and for example is used for the startup of centrifugal pump 2 and stops, because liquid is relatively low in this mode of operation downforce, so be flowing in gas tube 6a, the liquid 7a among the 6b, 7b need not guarantee that rotor 3 and stator 4 are not in contact with one another.The active adjustment magnetic bearing prevents being in contact with one another of 4 of rotor 3 and stators, especially when motor is static, under situation about producing more energetically with emergency operation bearing 10 or roller bearing 10 with transmitting effect power to stator 4.This can prove that it is favourable arranging an active axial magnetic bearing at stator 4.Fig. 2 has shown the active magnet on the end face of cylinder shape stator 4, and this active magnet is on terminal part 16a annular and that have Circular Winding 16 to be positioned to have good magnetic conductance.There is the active magnet of Circular Winding 16 to make rotor 3 near stator 4.During this period, liquid is between the rounded termination of the rounded termination part 16a of stator 4 and rotor 3 and has produced hydrodynamic bearing, and its active force acts on towards the direction of centrifugal pump 22.There is the active magnet of Circular Winding 16 to produce the power opposite with the former.Transducer 15 detects two terminal part 3b, the distance between the 16a.Sensor signal feed-in control device 40, this has encouraged the active of Circular Winding 16 magnet, meets preset value.

Fig. 1 a has shown the cross section by Fig. 3 along A-A.Stator 4 has several perforate 4e or groove 4e to run parallel to an A.The electric conductor 12 that embeds in the cross section of Fig. 1 a only illustrates in order to simplify this illustration in some groove 4e.Yet in the motor of assembling, fluted 4e the electric conductor 12 of an embedding is arranged.So can arrange and excitation conductor 12, like this

By rotatory current running and in stator 4, form rotating magnetic field.Do not have explanation to arrive the not thin slice 18 of liquid permeable among Fig. 3, just gas tube 18, can find in Fig. 1 a.Ecto-entad sees that at first rotor 3 has antiseepage fluid or liquid level 18, then is lamination armature assembly 3a, is the permanent magnet 8 that polarizes diametrically of one deck again and is antiseepage fluid or liquid level 18 on the permanent magnet 8 at last.For permanent magnet 8, represent that with arrow magnetized direction is accompanied by footpath upwardly extending magnetization and individual other permanent magnet 8 arranged in proximity at circumferencial direction, produced magnetization like this and radially outward pointed to the zone and radially inwardly point to the zone.Gap 6b covers on lamination armature assembly 11 and the groove 4e, and one deck antiseepage fluid or liquid level 18 are wherein arranged, and the liquid of protecting whole stator to avoid among the 6b of gap like this influences.

Fig. 3 has shown the sectional side elevation of gas tube motor 1, and wherein two asymmetrically distributed stators 4 link to each other by common axle 9c with two rotors 3.Centrifugal pump 2 is fixed on the common axle 9c.Centrifugal pump 2 and gas tube motor 1 are installed in pressure casing 5 jointly, and 5a is among the 5b.Again will be not thin layer 18 devices of liquid permeable on the surface of stator 4.From pressure face 24b, gap stream flows between shell 5 and rotor 3 by axial 7a, further flows between rotor 3 and stator 4 by opposite direction 7b and leads to a 9c by aperture 9b.The inlet side 24a of centrifugal pump 2 is flowed out and flow to

rear casing

5 and 3 of rotors at the center of upward axis 9c of flowing through then again by the opening 9b of 4 of rotor 3 and stators at the motor 1 in left side.Therefore realized hydrodynamic bearing.In the embodiments of figure 3, two motors 1 are bearing-free motor, as depicted in figure 2.As seen the advantage of Fig. 3 embodiment is that the layout of motor 1 symmetry has produced less bearing capacity, thereby wherein the lever arm between centrifugal pump 2 and the motor 1 is short and may operate a pump that a plurality of pressure stages are arranged in a simple manner between two motors 1.

Fig. 4 has shown the further embodiment of the centrifugal pump 2 that is driven by gas tube motor 1.Gas tube motor 1 has a stator 4 in inside, there is individual rotor 3 outside.Gas tube motor 1 has a liquid flow 7a again, and the formed journal bearing of 7b and one is by radially going up the Hydrodynamic spring bearing that the 7f that flows produces, wherein the direction of flow fluid bearing device 30c that flows of the supercentral perforate of axle 9c in the axial direction.Fluid flow back into the inlet side 24a of direction 7d and the last centrifugal pump 2 of 7e.The fluid bearing device 30c that is positioned at the right side has produced radial and axial suspension of going up axle 9c.In the embodiment of Fig. 4, again with bearing drive unit 30a as a bearing-free motor.

Fig. 5 has shown the further embodiment that the gas tube of external rotor 3 motor 1 is arranged.There is a bearing drive unit 30a in stator 4 left sides, and it is as bearing-free motor; There is a bearing arrangement 30b on the right side, and it is as active adjustment radial direction magnetic bearing 27.In addition, stator has active adjustment journal bearing 16,16a.Transducer 15 monitoring rotors 3 are with respect to the position of stator 4.The rounded termination 3b of rotor 3 has individual circular openings 26b.Stator 4 has individual annular protruding portion 26a, on perforate 26b opposite.These two assembly 26a, 26b forms passive mode 26a jointly, and 26b adjusts hydrodynamic bearing.Passive mode 26a, 26b is used for compensating in the axial direction with respect to stator 4 position of rotor 3.

Fig. 6 has shown gas tube motor 1 further embodiment, wherein gas tube 18 and external stator 4, and 4a is centered around outside the internal rotor 3.Gas tube motor 1 has two bearing arrangement 30a, and 30b is positioned in the axial direction with spaced apart respectively and at radial stator 4, among the 4a by the floating contactless support rotor 3 of type of action of magnetic.Wherein bearing arrangement 30a is as bearing-free motor, and its stator 4a has the motor winding of some number of pole-pairs p and the control winding of some number of pole-pairs p ± 1.In the rotor 3 of bearing-free motor 30a, winding 12c extends axially, and wherein the rotating magnetic field that is produced by motor winding 12 and control winding 12 is come induced current.Winding 12c is as short-circuited winding.Another bearing arrangement 30b is as the magnetic bearing of a band control winding 12b.But such control winding 12b comprises the winding of three or four separate excitations usually in order to be rotor 3 contactless suspensions.The as close as possible impeller 22 of magnetic bearing 30b is short as much as possible in the length of magnetic bearing 30b and 22 extensions of impeller with retainer shaft 9a part, and with respect to the power of impeller 22 generations, this part of axle 9a only forms the quarter butt arm diametrically like this.The footpath makes progress, and the distance between stator 4 and the rotor 3 is 1mm, and the thickness of gas tube 1 is that 0.6mm and air gap are separated 0.4mm.The position of transducer 15 monitoring rotors 3 is separated by these transducers 15 by gas tube 18 with rotor 3.Current vortex sensor, inductive pick-up or have the Hall element of permanent magnetism suitable for measuring principle.Axial magnetic bearing device 50 is positioned at the left end of rotor 3.The part of bearing arrangement 50 is in gas tube 18 inside and comprise a magnetic electric conductor 35b, should be for U-shaped and extend in the circumferencial direction of rotor 3 annular, permanent magnet 35c is located opposite among the magnetic electric conductor 35b in order to produce the permanent magnetism power on the circular 3b that acts on a 9a in the axial direction simultaneously.Bearing arrangement 50 outside a part is positioned at gas tube 18 and comprise the magnetic electric conductor 35a that annular is extended, but it is for U-shaped and the hot-wire coil 35 that individual excitation is arranged in U-shaped perforate arranged.This coil 35 can come excitation by control device 41, by the axial location of the rotor 3 of transducer 15a monitoring, can be affected under controlled way like this.

Fig. 7 has shown a layout that is similar to Fig. 6 embodiment, and the moving runner of centrifugal pump 2 is between bearing-free motor 30a and magnetic bearing 30b.At inlet side 20, moving runner 22 has individual hollow cylinder to extend 9d, and it cooperates as the magnetic conduction and with magnetic bearing 30b, extension 9d radially contactless suspension under the floating active force of magnetic like this.

Fig. 8 has shown the embodiment of magnetic bearing device 30b, and it is diametrically by magnetic action power support rotor 3 contactlessly.She Ji magnetic bearing device 30b is called as the one pole bearing and two rotary magnetic field motor stators 53,54 is arranged like this, and each has three coil 53a that form respectively, 53b, 53c; 54a, 54b, 54c.The permanent magnet 55 of axially going up polarization is positioned between the rotary magnetic field motor stator 53,54 and produces unipolar flux and flows to rotor 3 from rotary magnetic field motor stator 53 and flow to rotary magnetic field motor stator 54 more from behind.Coil is to 53a, 54a; 53b, 54b; 53c, 53c preferably connect and by a three-phase rotatory current source excitation, rotor 3 suspends contactless in magnetic bearing 30b like this.In an advantageous embodiments, rotor 3 has a groove 3z in the circumferencial direction extension.Groove 3z affects the stable of axial upper rotor part 3, has just axially produced the magnetic force opposite with deflection when rotor 3 deflections.For example, Fig. 8 has illustrated that the magnetic bearing 30b that meets embodiment can be used in gas tube motor 1, has equally also met Fig. 6.Rotor 3 has formed the part of axle 9a.If magnetic bearing 30b has individual groove 3z, need not in gas tube 18 parts of assembling spring bearing 50 so, because can produce and act on axial guiding force by arranging axle 9a and magnetic bearing 30b in the axial direction relatively.

Be equally applicable among the further embodiment of magnetic bearing 30b, U-shaped stator that is wound with three coils for example, be positioned at circumferencial direction and have a controlled coil for contactless magnetic suspension in rotor 3.

Described in this specification is preferred embodiment of the present utility model, and above embodiment is only in order to the technical solution of the utility model to be described but not to restriction of the present utility model.All those skilled in the art comply with design of the present utility model by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be within scope of the present utility model.

Claims

1. gas tube motor, it is characterized in that, comprise: a rotor, one stator and be positioned at described rotor, gas tube between the stator and bearing arrangement, wherein at least two described bearing arrangements have certain space with described rotor in the axial direction, and at least one described bearing arrangement is in order to as a bearing drive unit, described bearing drive unit comprises a motor driver and a magnetic bearing device, be used for to drive described rotor and diametrically by the described bearing drive unit described rotor that contactlessly suspends, described bearing drive unit is the bearing-free motor of a translator winding, comprises on the described stator that some number of pole-pairs P and described winding comprise some number of pole-pairs P ± 1.

2. gas tube motor as claimed in claim 1 is characterized in that, described bearing comprises a motor with described bearing drive unit and separates the magnetic bearing device of installing with one.

3. gas tube motor as claimed in claim 1 is characterized in that, described rotor is an internal rotor or an external rotor.

4. gas tube motor as claimed in claim 1 is characterized in that, described bearing arrangement is magnetic bearing device, and at least diametrically with the contactless suspension of described rotor.

5. gas tube motor as claimed in claim 1, it is characterized in that, described gas tube motor comprises that at least a transducer is in order to detect the position of described rotor, intermittently pipe is arranged between described transducer and described rotor, described transducer is based on the Magnetic Measurement principle, and described transducer is current vortex sensor or inductor transducer or Hall element.

6. gas tube motor as claimed in claim 1 is characterized in that, described gas tube motor comprises an active magnetizing coil in order to influence the axial location of rotor, and described gas tube extends between described rotor and described active magnetizing coil.

7. gas tube motor as claimed in claim 1 is characterized in that, described gas tube motor comprises a three-phase rotatory current control device, and described three-phase rotatory current control device is used for the described magnetic bearing device signal of feedback.

8. a pump that uses with each described gas tube electric drilling match of claim 1 to 7 is characterized in that described pump is used for fluid.