CN101876316B

CN101876316B - Permanent magnetism canning pump

Info

Publication number: CN101876316B
Application number: CN2009101361538A
Authority: CN
Inventors: 简焕然; 王锦城; 施志宽
Original assignee: Assoma Inc
Current assignee: Assoma Inc
Priority date: 2009-04-30
Filing date: 2009-04-30
Publication date: 2011-12-28
Anticipated expiration: 2029-04-30
Also published as: CN101876316A

Abstract

The invention provides a permanent magnetism canning pump, and in particular relates to a plastic or plastic-lined pump which is suitable for application such as the conveying, pressurization, circulation and the like of highly-corrosive chemical liquid. Aiming at the improvement of a supporting structure of a rotor system, a high-rigidity cantilever type fixing shaft structure is provided to meet various requirements. The high-rigidity cantilever type fixing shaft structure is characterized by comprising a high-rigidity metal shaft, a ceramic shaft sleeve, a motor rear frame and a sealing rear cover, wherein the high-rigidity metal shaft is fixed to the motor rear frame and forms a fixing shaft with the ceramic shaft sleeve; the ceramic shaft sleeve is used for forming the fixing shaft by combining with the metal shaft to support the rotation and the axial anti-thrust function of a motor rotor; the motor rear frame is used for fixing the metal shaft to strengthen the supporting strength of the fixing shaft and providing the sealing function of a motor coil by matching with the sealing rear cover; and the sealing rear cover is provided with a middle open pore through which the metal shaft can pass, and the inner space of the sealing rear cover is used for accommodating the motor rotor and providing the sealing function of a motor stator coil.

Description

Permanent magnetism canning pump

Technical field

Because the producer pursues the maximum utilization benefit of manufacturing mechanism, wish that same pumping energy is used in the high flow capacity low lift, also can be used in high-lift low flow condition, and the manager of production line is under the consideration of many factors, the pumping that might not have many different sizes is standby at any time, makes the permanent magnetism canning pump pay attention to for the user gradually; The present invention also does further improvement at above solution especially, makes the permanent magnetism canning pump can satisfy the demand of various uses with the pumping configuration of innovating.

The invention provides a kind of canned type glandlesspump Pu of using permanent magnet motor to drive,, be particularly useful for the plastics of purposes such as the highly corrosive chemical liquid send, pressurizes and circulates or the pumping of plastic inner lining hereinafter to be referred as permanent magnetism canning pump; Because highly corrosive chemical liquid erodibility is strong and leakage easily, add that the fluid temperature in the processing procedure can reach 85 ℃, can make the intensity of working of plastics significantly reduce and produce distortion, the stationary axle at the canned type glandlesspump of known plastics or plastic inner lining Pu is with inlet tripod and the bilateral support of sealing bonnet, or with the sealing bonnet strengthening structure fix the axle a monolateral support, its reliability and performance will greatly reduce; The present invention proposes to promote reliability and working life.

Background technique

Permanent magnetism canning pump has been widely used in many corrosion-resistant or do not allow the purposes of leakage, and the canned type glandlesspump Pu that makes with metallic material is applied in many industrial uses especially; But canned type glandlesspump Pu with the making of engineering plastics material, its design concept is to follow the design concept of not having axle envelope magnetic drive pump, and further combined with the traditional induction motor of permanent magnet motor replacement, its purpose is being used high efficiency motor and is being promoted the application area of pumping, and easier adjustment flow and lift and volume is littler more can satisfy the more demand of popularity of user on procedure for producing.

See also shown in Figure 1ly, the permanent magnetism canning pump of generally commonly using is bilateral support fixation axle construction; Pumping is made of with canned motor 8 pump protecgulum 4, impeller 5, sealing bonnet 41, stationary axle 3, axle tripod 31; Pump protecgulum 4 is provided with an inlet 44, outlet 45 and one runner space 47, is used for holding impeller 5, and pump protecgulum 4 inboards are provided with an inlet thrust ring 46 at inlet 44 places, is used for constituting axial thrust bearing with impeller thrust ring 53 coupling of impeller 5 inlet sides is common;

Impeller 5 is installed in pump protecgulum 4 inside, and the tripod 31 that is fixed on pump protecgulum 4 ingress can axially pass impeller boss perforate 54, is used for an end of support fixation axle 3; Impeller boss 52 is axially extended ring type structure, is used for combining with the portion that extends axially 76 of motor rotor 7, makes impeller 5 and motor rotor 7 constitute one, and many situations are that motor rotor 7 is the structure of one with impeller boss 52 injection moldings;

Motor rotor 7 is the ring type structures that are made of permanent magnet 71, rotor yoke 72, and be overmolding to a ring-shaped magnetic rotor encapsulate 74 that do not have to leak seam by corrosion resistant engineering plastics, rotor 7 hollow portions are provided with bearing 77 and bearing 78, are used for being coupled into the last item that surges with stationary axle 3 and hold rotation and the transmission of power of system with support rotor 7; The cylinder-like structure of rotor 7 is used for combining with the power of effective transmission rotor 7 with impeller boss 52 for extending axially portion 76, and many situations are that motor rotor 7 is the structure of one with impeller boss 52 injection moldings;

Bonnet 41 is a cup-like structure, and the flange part 411 of its front end is used for preventing the leakage of corrosion liquid in conjunction with the center flange 811 of pump protecgulum 4 and motor 8; The side cylindrical part 412 of bonnet 41 is inserted in the interior circle of motor stator 83, be used for completely cutting off corrosion liquid and prevent that motor coil 831 is corroded, the bottom of bonnet 41 is smooth plate-like, its central part has the boss 413 of a depression blind hole structure to be used for the other end of support fixation axle 3, and the fixing bonnet collar of thrust bearing 414, the internal capacity room space 415 of bonnet 41 is used for settling stationary axle 3 and motor rotor 7;

Stationary axle 3 is bilateral supporting structure, is made of corrosion-resistant and stupalith abrasion performance, and its two end is respectively by tripod 31 and 413 support fixation of boss, and intermediate portion and bearing 77 and bearing 78 are coupled and are used for the rotation of support rotor 7;

Canned motor 8 is made of with motor rotor 7 and stationary axle 3 motor stator 83, motor center 81, motor after-frame 82, pumping bonnet 41, wherein motor stator 83 is installed among the motor center 81, motor after-frame 82 is fixed on the motor center 81, and its middle body has a depression axle supporting base 821 to be used for fixing the boss 413 of bonnet, to strengthen the bracing force of stationary axle; Motor center 81 is used for tightly locking bonnet flange part 411 and pump protecgulum 4 at the flange 811 of pumping side, to prevent the leakage of corrosion liquid; 831 of motor stator 83 and coils thereof are sealed fully by bonnet 41, the leakage of isolated corrosion liquid with contact; The below of motor after-frame 82 is provided with power cable outlet 822, makes the power cable of driver can link stator coil with drive motor;

See also shown in Figure 2ly, another example of the permanent magnetism canning pump of commonly using is for the cantilever fixed axle structure; Pumping is made of with canned motor 8 pump protecgulum 4, impeller 5, sealing bonnet 41, stationary axle 3, pump protecgulum 4 is provided with an inlet 44, outlet 45 and one runner space 47, be used for holding impeller 5, pump protecgulum 4 inboards are provided with an inlet thrust ring 46 at inlet 44 places, be used for constituting axial thrust bearing jointly with impeller thrust ring 53 couplings of impeller 5 inlet sides;

Impeller 5 is installed in pump protecgulum 4 inside, the perforate 54 of its impeller boss plate 55 is used as internal lubrication circuit return port, also as the equalizing orifice of eliminating end thrust, impeller boss 52 is axially extended ring type structure, be used for combining with the portion that extends axially 76 of motor rotor 7, make impeller 5 and motor rotor 7 constitute one, many situations are that motor rotor 7 is the structure of one with impeller boss 52 injection moldings;

Motor rotor 7 is the ring type structures that are made of permanent magnet 71, rotor yoke 72, and be overmolding to a ring-shaped magnetic rotor encapsulate 74 that do not have to leak seam by corrosion resistant engineering plastics, rotor 7 hollow portions are provided with bearing 77 and bearing 78, be used for being coupled into the last item that surges and hold rotation and the transmission of power of system with support rotor 7 with stationary axle 3, the cylinder-like structure of rotor 7 is for extending axially portion 76, be used for combining with the power of effective transmission rotor 7 with impeller boss 52, many situations are that motor rotor 7 is the structure of one with impeller boss 52 injection moldings;

Bonnet 41 is a cup-like structure, the flange part 411 of its front end is in conjunction with frame flange 811 among pump protecgulum 4 and the motor 8, be used for preventing the leakage of corrosion liquid, the side cylindrical part 412 of bonnet 41 is inserted in the interior circle of motor stator 83, is used for completely cutting off corrosion liquid and prevents that motor coil 831 is corroded; The bottom complete packet of bonnet 41 is covered with an end of a rigid structural member 416 and stationary axle 3, and wherein the central hole of rigid structural member 416 is used for an end of support fixation axle 3, and provides fixed base to fix the bonnet collar of thrust bearing 414; The internal capacity room space 415 of bonnet 41 is used for settling stationary axle 3 and motor rotor 7;

Stationary axle 3 is made of with stupalith abrasion performance corrosion-resistant for cantilever structure, and the one end is by 416 support fixation of bottom rigid construction of bonnet 41, and intermediate portion and bearing 77 and bearing 78 are coupled and are used for the rotation of support rotor 7;

Canned motor 8 is by motor stator 83, motor center 81, motor after-frame 82, pumping bonnet 41 constitutes with motor rotor 7 and stationary axle 3, wherein motor stator 83 is installed among the motor center 81, motor after-frame 82 is fixed on the motor center 81, motor center 81 is used for tightly locking bonnet flange part 411 and pump protecgulum 4 at the flange 811 of pumping side, to prevent the leakage of corrosion liquid, 831 of motor stator 83 and coils thereof are sealed fully by bonnet 41, the leakage of isolated corrosion liquid with contact, the below of motor after-frame 82 is provided with power cable outlet 822, makes the power cable of driver can link stator coil with drive motor;

See also Fig. 1 and shown in Figure 2, fluid flow direction 6 is flowed through when pumping is turned round becomes the fluid with pressure behind the runner of impeller 5, as flow direction 61, and by pump discharge 45 outputs, segment fluid flow is arranged simultaneously, as flow direction 62, enter the room space 415 of bonnet 41 via the dorsal part of impeller 5, and flow to the bonnet bottom, as flow direction 63 via the rotor outside and the gap of bonnet internal diameter, again via the Clearance Flow of stationary axle 3 with bearing 77 and bearing 78, as flow direction 64, the impeller hub bore 54 of flowing through at last is as flow direction 65, get back to impeller eye, it is lubricated required and take away the heat that rotor produces that the circulating of this fluid is used to provide ceramic bearing;

The basic structure of permanent magnetism canning pump is that the motor coil 831 with canned motor 8 provides the stator rotating magnetic field, and interact producing moment of torsion and rotation with motor rotor 7 permanent magnetic fields, method for driving is with not have the direct couple drive of axle envelope magnetic drive pump use permanent magnetism inner and outer rotors different; Because motor coil 831 is to be made of inductor coil, this means that inductor coil need can produce enough magnetic flux by the volume bigger than permanent magnetic magnet, the magnetic flux of perhaps relative increase motor rotor 7, so the structure of motor rotor 7 must cooperatively interact with motor stator 83 can produce preferable effect; But this means that also the stationary axle 3 of motor 8 must bear more centrifugal loadings that produce from motor rotor 7 weight, the load of these centrifugal force comes from the remaining amount of unbalance of motor rotor 7 itself, adds the centrifugal force that the lubrication gap off-centre when the last item acknowledgement of consignment of surging is changeed is produced;

When the technology of commonly using supported motor stationary axle 3 with the working of plastics structural strength, often demand side was to the problem of structural strength deficiency, and especially temperature is in the time of 85 ℃; Next is that working of plastics is different with the heat distortion amount of ceramic fitting, also can significantly reduce the support force of stationary axle 3 or produce distortion, one of main supporting structure of for example bilateral support fixation axle is a tripod 31, and the cantilever structure of tripod 31 at high temperature intensity can reduce and makes the eccentric shaft amount increase; No matter bilateral support fixation axle 3 or cantilever support stationary axle 3, bonnet 41 is another supporting structures of stationary axle 3, the thickness of bonnet 41 itself is thinner in side cylindrical part 412, produce distortion because of fluid temperature or pressure easily, though side cylindrical part 412 has the interior circle of motor stator to support, but its distortion still influences bonnet bottom center axle location easily, and this also is to cause stationary axle to produce another reason of dystopy; When temperature and pressure are increased to bonnet and are enough to be out of shape, stationary axle can't combine closely with tripod 31 and boss 413 and become flexible again, the thermal distortion different in kind of the former because plastic materials of Song Dong other and stupalith in addition causes that the generation gap makes stationary axle 3 become flexible between stationary axle 3 and plastics material;

Permanent magnetism canning pump is driven by driver, as long as the output power of permanent magnetism canning motor 8 in the reasonable scope, or output torque in the reasonable scope, and increase that can be suitable surpasses the rotating speed of rated point; When the slow-speed of revolution is operated, the consideration of these amount of deformation and centrifugal force does not pay particular attention to, but when running speed surpassed rated speed, the centrifugal force that stationary axle 3 is born just can increase with the quadratic power multiple of rotating ratio.

Comprehensive above pumping running demand, at the application demand of height corrosion processing procedure, the key problem that solution must be faced is as follows:

(1) plastics and the problem of stupalith because of the adhesive strength deficiency of the different generations of thermophysical property.

(2) plastic materials intensity at high temperature reduces problem.

(3) running speed is surpassing the problem that centrifugal force increases under the rated speed.

The solution of above problem must be analyzed at the concrete reason of every problem, can reach the purpose of dealing with problems fully, below is the problem cause analysis:

(1) plastic material strength problem: the intensity of many corrosion resistant materials can't be compared with stupalith, and especially the strength of materials significantly reduces during increase in temperature, and partly plastic still has good intensity but its corrosion resistance deficiency under increase in temperature.

(2) plastic materials thermal distortion problem: its heat-resistant deforming rerum natura of many anti-corrosion plastic materialss is not good, can't keep the combining closely property with stupalith.

(3) high rotating speed centrifugal force problem: the quality of motor rotor is big, and the last item that surges holds and stationary axle between lubricated required gap is arranged, can strengthen the burden of stationary axle centrifugal force, and centrifugal force becomes 2 powers of rotating ratio to increase, when pumping was higher than the rated speed running, stationary axle must be born higher centrifugal force.

Be suggested for solving the above problems existing relevant solution, wherein:

Case is for GB2417981 number to take the design of cantilever fixed axle structure before the B. P., use high rigid structural member to penetrate in sealing bonnet bottom with stationary axle, make plastic materials and stationary axle combine closely and improve the axle support force, the material that this patent is used is resistant to elevated temperatures and high-intensity engineering plastics as tool, but this kind material can't satisfy the demand of the contour corrosion soup of hydrofluoric acid; Because case is to be used for the engine cooling water circulation to there is no the corrosion resistance problem before this patent, but with regard to be applied in corrosion-resistant purposes with this plastics material with regard to, the combination of its stationary axle and plastics, and the combination of other metalwork and plastics all can't be done complete sealing to highly corrosive liquid; Secondly the thinner thickness rigidity deficiency of the cylindrical part of bonnet also causes the displacement or the dystopy of stationary axle easily.

In addition, case is to use the fixed axle structure of bilateral support for JP2005299559 number before the Japan Patent, uses tripod and uses the rigid structural member that adds to strengthen the support of stationary axle in the bonnet bottom at the pumping inlet; The emphasis of case is in the design of doing loss of weight at the weight of rotor before this patent, and these characteristics effectively solve the weight issue of rotor; But its structure still can't satisfy the plastics material softening transform problem of bonnet cylindrical part under the high temperature, tripod problem on deformation at high temperature, secondly rigid structural member must consider to be used in the demand of high corrosion liquid, and case only is useful in the purposes of the no corrosion liquid of engine cooling water circulation before this patent.

Also can't corrode high temperature soup processing procedure to height proposes complete answer to above solution, so the present invention will provide optimum scheme to satisfy user's demand at the problems referred to above.

In view of this inventor accumulates and is engaged in the industry experience for many years, is study intensively and test improvement repeatedly, invents out a kind of permanent magnetism canning pump finally; The present invention can further promote the performance of product, to promote effect and to promote running usefulness.

Summary of the invention

Main purpose of the present invention is to provide a kind of permanent magnetism canning pump that the liquid material is anti-corrosion plastics that connects, especially do further improvement at monolateral fixing cantilevered axle structure, make the intensity of stationary axle can satisfy various power demands and high speed demand, and the sealing function of lift-off seal bonnet is to satisfy the corrosion-resistant demand of various chemical liquids; Because the structure of innovation more can satisfy the structural strength demand of high temperature process.

It is as follows that Zi Zuo describes the present invention in detail with accompanying drawing:

Description of drawings

Fig. 1 is the bilateral support fixation axle product generalized section of commonly using.

Fig. 2 is the cantilever stationary axle product generalized section of commonly using.

Fig. 3 is the embodiments of the invention generalized section.

Fig. 4 is a fixed axle structure schematic representation of the present invention.

Fig. 5 is motor rotor of the present invention and impeller generalized section

Fig. 6 is a sealing bonnet generalized section of the present invention.

Fig. 7 is a metal shaft generalized section of the present invention.

Fig. 8 is a motor after-frame generalized section of the present invention.

Fig. 9 is a Ceramic shaft sleeve generalized section of the present invention.

[primary clustering symbol description]

3: stationary axle

31: the axle tripod

32: metal shaft

321: rounded nose

322: encapsulate

323: thread

324: nut

33: Ceramic shaft sleeve

331: Thrust Faces

332: center hole

333: end face

334: bearing outside surface

335: fixing end face

4: protecgulum

41: bonnet

411: flange part

412: cylindrical part

413: boss

414: the bonnet collar of thrust bearing

415: the room space

417: the bonnet backboard

418: axis hole

44: inlet

45: outlet

46: the inlet thrust ring

47: flow channel space

5: impeller

52: impeller boss

53: the impeller thrust ring

54: the impeller boss perforate

55: the impeller boss plate

6: flow direction

61: flow direction

62: flow direction

63: flow direction

64: flow direction

65: flow direction

7: motor rotor

71: permanent magnet

72: rotor yoke

74: the rotor encapsulate

75: bearing sleeve

76: extend axially portion

77: bearing

78: bearing

79: bearing

8: canned motor

81: the motor center

811: flange

82: the motor after-frame

821: the axle supporting base

822: the power cable outlet

823: center hole

825: compressing surface

83: motor stator

831: motor coil

Embodiment

See also shown in Figure 3ly, permanent magnetism canning pump of the present invention is the cantilever fixed axle structure; This pumping is made of with canned motor 8 pump protecgulum 4, impeller 5, wherein:

Pump protecgulum 4 is provided with an inlet 44, outlet 45 and one runner space 47, is used for holding impeller 5; Pump protecgulum 4 inboards are provided with an inlet thrust ring 46 at inlet 44 places, be used for constituting axial thrust bearing jointly with impeller thrust ring 53 couplings of impeller 5 inlet sides;

Impeller 5 is installed in pump protecgulum 4 inside, and its impeller boss plate 55 is provided with plurality of openings 54 and is used as internal lubrication circuit return port, also as the equalizing orifice of eliminating end thrust; Impeller boss 52 is axially extended ring type structure, is used for combining with the portion that extends axially 76 of motor rotor 7, makes impeller 5 and motor rotor 7 constitute one;

Canned motor 8 is made of motor stator 83, motor center 81, motor after-frame 82, pumping bonnet 41, motor rotor 7 and stationary axle 3; Wherein motor stator 83 is installed among the motor center 81, motor after-frame 82 is fixed on the motor center 81, the flange part 411 of bonnet 41 is in conjunction with 417 one-tenth one rigid flange structures of bonnet backboard, motor center 81 is used for tightly locking bonnet flange part 411 and pump protecgulum 4 at the flange 811 of pumping side, to prevent the leakage of corrosion liquid; 831 of motor stator 83 and coils thereof are sealed fully by bonnet 41, the leakage of isolated corrosion liquid with contact; The below of motor after-frame 82 is provided with power cable outlet 822, makes the power cable of driver can link stator coil with drive motor;

The motor rotor 7 of canned motor 8 is the ring type structures that are made of permanent magnet 71, rotor yoke 72 and bearing sleeve 75, and be overmolding to a ring-shaped magnetic rotor encapsulate 74 that do not have to leak seam by corrosion resistant engineering plastics, rotor 7 hollow portions are provided with bearing 79, be used for being coupled into the last item that surges and hold rotation and the transmission of power of system with support rotor 7 with stationary axle 3, the cylinder-like structure of rotor 7 increases rigidity and intensity for extending axially portion 76 by bearing sleeve 75, is used for combining with the power of effective transmission rotor 7 with impeller boss 52;

The bonnet 41 of canned motor 8 is a cup-like structure, and the flange part 411 of its front end again in conjunction with the center flange 811 of pump protecgulum 4 and motor 8, is used for preventing that the leakage of corrosion liquid is with reinforced seal at first in conjunction with 417 one-tenth one rigid flange structures of bonnet backboard; The side cylindrical part 412 of bonnet 41 is inserted in the interior circle of motor stator 83, is used for completely cutting off corrosion liquid and prevents that motor coil 831 is corroded; The bottom center of bonnet 41 has an axis hole 418 with O type ring seal groove, pass to hold the metal shaft 32 that constitutes stationary axle 3, this metal shaft 32 is passed the center hole 332 of Ceramic shaft sleeve, see also shown in Figure 7, stationary axle 3 is pressed on the front-end face 333 (as Fig. 9) of Ceramic shaft sleeve with rounded nose 321 1 ends of metal shaft 32 1 ends, the other end that metal shaft 32 has a thread 323 then passes motor after-frame hole 823 and tightly is locked in motor after-frame 82 (as Fig. 8), make the Ceramic shaft sleeve 33 of having thrust ring can be pressed on motor after-frame 82, and make the bottom of bonnet 41 constitute a complete seal face by O type ring; The internal capacity room space 415 of bonnet 41 is used for settling stationary axle 3 and motor rotor 7;

The stationary axle 3 of canned motor 8 is made of with motor after-frame 82 corrosion-resistant Ceramic shaft sleeve 33, metal shaft 32 with abrasion performance for cantilever structure, and constitutes complete axle sealing system jointly with bonnet 41; Ceramic shaft sleeve 33 is compressed with compressing surface 825 tight locks of after-frame 82 by the rounded nose 321 of metal shaft 32, and constitutes the combined type stationary axle 3 of a high rigidity; Wherein metal shaft 32 is passed the axis hole 418 of the bottom center of bonnet 41 with O type ring seal groove, see also shown in Fig. 7 and 9, this metal shaft 32 is passed the center hole 332 of Ceramic shaft sleeve, and be pressed on the front-end face 333 of Ceramic shaft sleeve with a end with rounded nose 321, the other end that metal shaft 32 has thread 323 then passes motor after-frame hole 823, and tightly be locked in (as Fig. 8) on the motor after-frame 82 with nut 324, make Ceramic shaft sleeve 33 can be pressed on the compressing surface 825 of motor after-frame 82, see also shown in Figure 4ly, guarantee that the O type ring of bonnet 41 bottoms has correct decrement to constitute a complete seal; 321 of the rounded noses of metal shaft 32 are with plastics encapsulate 322, on it and be provided with O type ring to reach the anti-corrosion function of sealing; The thrust ring portion 331 of Ceramic shaft sleeve 33 is used for constituting the pressure thrust bearing that surges with rotor bearing 79 mutual couplings;

See also shown in Figure 3, fluid flow direction 6 is flowed through when pumping is turned round becomes the fluid with pressure behind the runner of impeller 5, as flow direction 61, and by pump discharge 45 outputs, segment fluid flow is arranged simultaneously, as flow direction 62, enter the room space 415 of bonnet 41 via the dorsal part of impeller 5, and flow to the bonnet bottom, as flow direction 63 via the rotor outside and the gap of bonnet internal diameter, again via the Clearance Flow of stationary axle 3 with bearing 79, as flow direction 64, the impeller hub bore 54 of flowing through at last is as flow direction 65, get back to impeller eye, it is lubricated required and take away the heat that rotor produces that the circulating of this fluid is used to provide ceramic bearing;

See also shown in Figure 4, specify and be fixed on the relation of motor after-frame for the formation of stationary axle 3, the stationary axle 3 of cantilever structure is by Ceramic shaft sleeve 33, metal shaft 32 constitutes with motor after-frame 82, and constitute complete axle sealing system with bonnet 41 is common, the intensity source of stationary axle 3 is nut 324 tight its threads 323 of lock by metal shaft 32, this metal shaft 32 is passed the center hole 332 of Ceramic shaft sleeve, and be pressed on the front-end face 333 of Ceramic shaft sleeve with a end with rounded nose 321, make Ceramic shaft sleeve fixedly end face 335 be pressed on the compressing surface 825 of motor after-frame 82, by the fixing frictional force that produces of the compressing surface 825 of end face 335 and motor after-frame 82 of the pottery of high compression rigidity, make stationary axle 3 become the stiff shaft of a compound body; Wherein metal shaft 32 must be able to provide high tension intensity to be applied on the Ceramic shaft sleeve 33 so that enough strength to be provided, and be converted into the intensity that is compressed of Ceramic shaft sleeve 33, the bracing force of stationary axle 3 is to be provided by metal shaft 32 separately no longer just, but constitute the stationary axle 3 of high rigidity by composite structure, simultaneously provide more complete bracing force by motor after-frame 82, the structural strength of stationary axle 3 of the present invention overcomes the structure weakness of bonnet 41 fully;

And the sealing system of bonnet 41 is made of bonnet 41 and stationary axle 3, the metal shaft 32 of stationary axle 3 is passed the axis hole 418 of the bottom center of bonnet 41 with O type ring seal groove, have the part of thread 323 and pass motor after-frame hole 823, and tightly be locked on the motor after-frame 82 with nut 324, make ceramic fixedly end face 335 be pressed on the compressing surface 825 of motor after-frame 82, and guarantee that the O type ring of bonnet 41 bottoms has correct decrement to constitute a complete seal;

See also shown in Figure 5, the structure explanation that motor rotor 7 and impeller 5 are combined into one, the impeller boss 52 of impeller is that a section roller is to extended structure, combine with the portion that extends axially 76 of rotor 7, make that the power of rotor 7 is transmitted, motor rotor 7 is made of with rotor encapsulate 74 permanent magnet 71, rotor yoke 72, the bearing sleeve 75 of high magnetic flux density, be equiped with in the rotor bore bearing 79 be used for stationary axle 3 on Ceramic shaft sleeve 33 coupling, constitute the last item that surges and hold and be used for the running of support rotor 7; The encapsulate 74 of motor rotor 7 is complete seamless encapsulate, and for strengthening extending axially the intensity of portion 76, bearing sleeve 75 is also done and extended axially to strengthen its intensity;

Because the weight of motor rotor 7 becomes the main source of centrifugal force, next is the eccentric dystopy amount that encapsulate work produces, the source of weight comprises permanent magnet 71, rotor yoke 72, bearing sleeve 75, rotor encapsulate 74 and bearing 79, rotor light-weight design emphasis of the present invention makes permanent magnet 71 and rotor yoke 72 lightweights, just can satisfy the maximum inner diameter of possessing rotor yoke 72 under the Magnetic flux density demand, this structure can obtain light-weighted rotor weight; Exist but between the external diameter of the internal diameter of rotor yoke 72 and bearing 79, have big radial space, and cause the excessive generation distortion of the thickness isogonic ectopia cordis problem of rotor encapsulate 74; The present invention adopts the bearing sleeve 75 of lightweight high-intensity to overcome the method that encapsulate work produces distortion isogonic ectopia cordis problem, the length that the length of bearing sleeve 75 contains rotor yoke 72 length and extends axially portion 76, the inside of the portion of extending axially 76 is supported by bearing sleeve 75, guarantee that the portion that extends axially 76 possesses best transmission of power rigidity, constitute the present invention by above design and still can maintain rational equal thickness and can not produce irregular contraction deformation at the encapsulate 74 of rotor 7, a nearly step guarantees that the encapsulate engineering of rotor 7 has good uneven residual amount;

See also shown in Figure 6, the structure explanation of motor bonnet 41, motor bonnet 41 is a cup-shaped structure, opening side has a flange part 411 to be used for combining with pumping protecgulum 4 to constitute airtight flow channel space 47 and room space 415, the rear side of flange part 411 has a bonnet backboard 417 to provide flange part 411 better structural strength, and guarantees that motor bonnet 41 and pumping protecgulum 4 have best sealing configuration to prevent the leakage of corrosion liquid; The side cylindrical part 412 of bonnet 41 is inserted in the interior circle (seeing also Fig. 4) of motor stator 83, is used for completely cutting off corrosion liquid and prevents that motor coil 831 is corroded; The thickness of side cylindrical part 412 must satisfy structural strength and corrosion allowance, and thickness is too high will to reduce motor performance, and thickness is not enough to influence the corrosion-resistant time limit; The bottom of bonnet 41 has a perforate 418 to allow that metal shaft 32 passes, and is used in conjunction with Ceramic shaft sleeve 33 and motor after-frame 82 to constitute the complete seal of bonnet 41, and the structural strength weakness of bonnet 41 can be avoided fully;

See also shown in Fig. 6-9, metal shaft 32 1 ends have rounded nose 321 and are used for pressing Ceramic shaft sleeve 33,321 of rounded noses are with plastics encapsulate 322, on it and be provided with O type ring with reach the sealing anti-corrosion function, metal shaft 32 the other ends are for having thread 323, when metal shaft 32 is correctly installed, rounded nose 321 is pressed on the front-end face 333 of Ceramic shaft sleeve 33, the other end of thread 323 passes the axis hole 418 of bonnet 41 and tightly locks motor after-frames 82 with nut 324, this metal shaft 32 is passed the center hole 332 of Ceramic shaft sleeve 33, make Ceramic shaft sleeve 33 can be pressed on the compressing surface 825 of motor after-frame 82, and guarantee that the O type ring of bonnet 41 bottoms has correct decrement to constitute a complete seal;

Cooperate shown in Figure 8, motor after-frame 82 is a metal workpieces, being used for the hermetic motor coil does not make and can be exposed in the corrosive atmosphere, and provide cantilever type to rigidly fix axle 3 the strongest supports, its center hole 823 can allow the thread 323 of metal shaft 32 pass, compressing surface 825 is used for being coupled with the end face 335 of Ceramic shaft sleeve 33, and Ceramic shaft sleeve 33 provides high-intensity supporting structure when being compressed; When motor bonnet 41 is fixed axle 3 tight locks, motor after-frame 82 can guarantee correctly that with Ceramic shaft sleeve 33 the O type ring of bonnet 41 sealings has correct compression seal, on the motor after-frame 82 and be provided with a plurality of O type annular grooves, be used to provide the usefulness of

motor coil

831 and 41 sealings of motor bonnet respectively, on the motor after-frame 82 and elastic cable paper outlet 822 is arranged, the elastic cable paper that is used to provide driver links motor coil 831.

Cooperate shown in Figure 9, Ceramic shaft sleeve 33 is a tubular structure, its center hole 332 is used for allowing that metal shaft 32 passes, end face 333 is used for compressing with 321 driving fits of metal shaft head, another side 331 has plate-like thrust ring structure, be used for being coupled, constitute the thrust bearing of motor rotor 7 with the axial end of the bearing 79 of rotor 7; Bearing outside surface 334 is that the aperture surface of the bearing 79 of a smooth surface and rotor 7 constitutes the last item that surges and holds, and providing rotor rotation required support slip surface, end face 335 combines with the compressing surface 825 of motor after-frame 82 and rigidly fixes spools 3 to constitute height.

Cantilever type stationary axle 3 structures of the present invention overcome the problem that known technology is subject to bonnet 41 strength deficiencies fully, and it is different with the heat distortion amount of ceramic fitting and significantly reduce support force or produce the problem of distortion to overcome working of plastics, when temperature and pressure are increased to bonnet 41 and are enough to be out of shape, stationary axle 3 also will continue to provide sufficient intensity unaffected fully; When the rotating speed of the increase of operating rotating speed above rated point, stationary axle 3 can bear the centrifugal force that increases with the quadratic power multiple fully.

In sum, the height that the present invention is suitable for the variable speed permanent magnetism canning pump rigidly fixes axle construction, the cantilever type stationary axle is installed on the canned motor of pumping inside, and constituted by sealing bonnet, motor after-frame, Ceramic shaft sleeve and metal shaft, the simple structure of this high rigidity can support the running of motor rotor effectively, and the sealing of keeping pumping internal corrosion soup do not have leakage, and it can be for utilizing on the industry when unquestionable; And the present invention never makes the city know or seen other publication, and the real regulation that has met Patent Law is so propose patent application in accordance with the law.

Claims

1. permanent magnetism canning pump, this pumping is made of pump protecgulum, impeller and canned motor, wherein:

The pump protecgulum is provided with an inlet, outlet and a runner space and is used for holding impeller;

Impeller, be installed in pump protecgulum inside, its impeller boss plate is provided with plurality of openings and is used as internal lubrication circuit return port, also as the equalizing orifice of eliminating end thrust, impeller boss is axially extended ring type structure, be used for combining, make impeller and motor rotor constitute one with the portion of extending axially of motor rotor;

Canned motor, by motor stator, the motor center, the motor after-frame, the pumping bonnet, motor rotor and stationary axle constitute, wherein motor stator is installed among the motor center, the motor after-frame is fixed on the motor center, pumping bonnet flange part, motor center flange and pump protecgulum are tightly locked sealing, to prevent the leakage of corrosion liquid, motor stator and coil thereof are then sealed fully by the pumping bonnet, the leakage of isolated corrosion liquid with contact, the below of motor after-frame is provided with power cable outlet, makes the power cable of driver can link stator coil to drive canned motor;

The motor rotor of canned motor is the ring type structure that is made of permanent magnet, rotor yoke and bearing sleeve, and be overmolding to a ring-shaped magnetic rotor encapsulate that do not have to leak seam by corrosion resistant engineering plastics, the hollow portion of rotor is provided with bearing and is used for Ceramic shaft sleeve with stationary axle and is coupled into the last item that surges and holds system, the cylinder-like structure of rotor increases rigidity and intensity for extending axially portion by bearing sleeve, is used for combining with the power of effective transmission rotor with impeller boss;

The pumping bonnet of canned motor is a cup-like structure, the flange part of its front end is used in conjunction with protecgulum and center flange, the leakage that is used for preventing corrosion liquid is with reinforced seal, and the side cylindrical part of bonnet is inserted in the interior circle of motor stator, is used for completely cutting off corrosion liquid and prevents that motor coil is corroded; The bottom center of bonnet has an axis hole with O type ring seal groove, to constitute the cantilever type stationary axle of tool sealing function; Stationary axle is that cantilever structure is made of with Ceramic shaft sleeve, metal shaft and motor after-frame abrasion performance corrosion-resistant, and constitute complete axle sealing system with the pumping bonnet is common, Ceramic shaft sleeve is tightly locked compression by the rounded nose of metal shaft and the compressing surface of after-frame, to constitute the combined type stationary axle of a high rigidity; Wherein metal shaft is passed the axis hole of the bottom center of bonnet with O type ring seal groove, this metal shaft is passed the center hole of Ceramic shaft sleeve, and be pressed on the front-end face of Ceramic shaft sleeve with a end with rounded nose, the other end that metal shaft has thread then passes motor after-frame hole, and tightly be locked on the motor after-frame with nut, make Ceramic shaft sleeve can be pressed on the compressing surface of motor after-frame, and guarantee that the O type ring of pumping bonnet bottom has correct decrement to constitute a complete seal; The rounded nose of metal shaft is then with the plastics encapsulate, and on it and be provided with O type ring reaching the anti-corrosion function of sealing, the thrust ring portion of Ceramic shaft sleeve is used for being coupled mutually with rotor bearing and constitutes the pressure thrust bearing that surges.