CN1064114C

CN1064114C - Canned motor pump

Info

Publication number: CN1064114C
Application number: CN94108227A
Authority: CN
Inventors: 秋久和己; 高岛武博
Original assignee: Imperial Electric Co ltd
Current assignee: Imperial Electric Co ltd; Teikoku Electric Mfg Co Ltd
Priority date: 1994-07-08
Filing date: 1994-07-08
Publication date: 2001-04-04
Anticipated expiration: 2014-07-08
Also published as: CN1114720A

Abstract

The present invention relates to a sealed motor pump provided with a sealed casing body for covering a stator and a rotor, wherein inner parts of the sealed casing body are communicated with inner parts of the pump. The surface of the supported part on the rotor shaft in contact with liquid flowing in the sealed casing body is polished by an electrolytic polishing method, and therefore, the liquid capable of generating polymerization reaction easily or viscous liquid can be used as circulating liquid for normally circulating and cooling a motor. In addition, the supporting part for supporting a rotating shaft comprises a bearing made of fluorine resin or glass fiber reinforced fluorine resin.

Description

Canned motor pump

The present invention relates to the not canned motor pump of tape spool Sealing.

Canned motor pump is a kind of pump that does not leak type of the prior art, and the pump of it and common usefulness is different, and the leakage that shaft seal stops liquid in the pump case axle district that pump shaft is installed is not set.For example, as shown in Figure 3, canned motor pump contain a pump case 40, support that is connected with pump case 40 41, one stator 42 is sealed shut impeller 48 and a Circulation pipe 51 on the bearing 46 of the rotating shaft 45 of the stator cover under the sealing state 43, rotor housing that rotor seal is got up 44, supporting rotor and 47, ends that are fixed on rotating shaft 45.、

It is to import the inside of motor or the inside of stator cover 43 for the partially liq of will discharge from housing flange 49 that Circulation pipe 51 is set.In such canned motor pump, the liquid of a part of pumping circulates, as the circulating liquid in the motor so as lubricated and cooling bearing 46 and 47 and cooling can produce the coil of heat.

Canned motor pump with this structure is because the liquid that can not of institute's pumping spills, so be applicable to the harmful liquid of pumping, volatile or inflammable liquid and corrosive liquids.In addition and since outside air can suction pump in, work the easy liquid of reduction quality when being used for pumping contact ambient air so this canned motor pump is applicable in vacuum system.Therefore, such pump is widely used for chemistry, nuclear power and energy industry.

Yet, this known canned motor pump is at the liquid (for example acrylic monomers) of the easy polymerization reaction take place of pumping, when containing the liquid of polymer or containing the liquid of stickum, can make liquid polymerization reaction take place or increased viscosity in cyclic process because of the frictional heat of the bearing member of pump and/or the heat that motor coil produced in the course of the work.Therefore such problem can occur, the circulating liquid that promptly is used for cooling motor can not normal circulation.As long as liquid can not normal circulation as above-mentioned, just the work that must stop pump is once so that it cools off certain hour.In case pump quits work, whole system will be subjected to very big influence.Therefore, in order to address this problem, wish to have a kind of canned motor pump that can control the above-mentioned heat that produces.

In view of the problems referred to above that the canned motor pump of prior art exists, the object of the present invention is to provide a kind of liquid of can normally circulate a kind of easy polymerization reaction take place or viscosity to come the canned motor pump of cooling motor as a kind of circulating liquid.

To achieve the above object, the invention provides a kind of canned motor pump that covers the enclosing housing of a stator and a rotor that has, the inner body of above-mentioned enclosing housing is connected with the inner body of pump, with the surface process electropolishing method polishing treatment that is supported the position on the contacted above-mentioned rotor shaft of flowing liquid in above-mentioned enclosing housing.

The support accessory that supports above-mentioned rotating shaft can contain the bearing of being made by fluororesin or glass fibre reinforced fluorine resin.

Above-mentioned sealing electric pump structure can be the circulation shape canned motor pump of Circulation pipe of the inner body of a kind of exhaust port that has a connection pump case and enclosing housing, and, a cooling mechanism can be set on the circulation route of Circulation pipe.

Best, the gap between the outer wall of the internal diameter of Circulation pipe and/or the rotor housing of canned motor pump and the inwall of stator cover can be decided according to the circulating liquid scale of construction of normal circulation.

According to the present invention, as mentioned above, in enclosing housing flowing liquid with contact by the surface that is supported part of the rotor shaft of electropolishing method polishing, so when the sealing electric pump work, the frictional heat that is produced when just the may command working fluid contacts with the surface that is supported the position of rotor shaft, flow of fluid is stable, also can stably supply with circulating liquid comes cooling motor thereby make.

Of the present invention above-mentioned with other purpose and the explanation of its feature and advantage below (identical part gives identical label in the accompanying drawing) read in conjunction with the accompanying drawings after more thorough understanding can be arranged.In the accompanying drawing:

Fig. 1 is the embodiment's of the expression a kind of canned motor pump of the present invention sectional view of structure;

Fig. 2 is that expression is arranged on the sectional view with the structure of the cooling mechanism on a kind of embodiment's the Circulation pipe;

Fig. 3 is the sectional view of the sealing electric pump structure of expression prior art.

Referring to Fig. 1, the pump case 2 that has suction port and exhaust port and have an impeller 1 to be positioned at wherein is connected with columniform support 3.Be covered with one group of Motor Components in the support 3.The stator seal closure 5 that the internal surface of the stator 4 in the Motor Components is made by the outer magnetic metal thin plate of a usefulness seals up fully, thereby its lateral surface is then sealed by a corrosion resistant metal thick plate and guarantees that the state that stator is in isolation enters in the stator 4 with the liquid that prevents pumping.In the present embodiment, the liquid of institute's pumping is acrylic monomers.

The outer surface that is positioned at the rotor 6 of stator seal closure 5 the insides is also sealed up closely by a rotor seal cover 7 made from the nonmagnetic metal thin plate, thereby its lateral surface is then sealed fully by a corrosion resistant metal thick plate and guaranteed that rotor 6 is in isolation, prevents that the liquid of institute's pumping from entering in the rotor 6.Specifically, above-mentioned non magnetic thin plate is a corrosion resistant plate.

The axle 8 of rotor 6 is bearing on the bearing member, and promptly two point of contact of axle 8 are bearing on bearing 9b and the 10b by axle sleeve 9a and 10a.Impeller 1 is fixed on the end of axle 8.

Label

9c and 10c represent Thrust ring.Above-mentioned

axle sleeve

9a and 10a and

Thrust ring

9c and 10c make overall structure, can be regarded as one " part that is supported ".

The surface of

axle sleeve

9a and 10a and

Thrust ring

9c and 10c is polished to surface roughness by a kind of compound electrolytic brightening process, and to be about maximum height be 0.5 micron.This compound electrolytic brightening process is a kind of comprehensive electrolysis to the polishing technology of the mechanical friction effect of the solution of metal and abrasive material.Having the electrode of alternately arrangement and the polishing cutter of abrasive material is pressed on the polished surface while rotating.Electrolysis has produced a kind of passivation film on irregular part on the metal surface that will polish, abrasive material is then removed each high putting till original appearance appears in metal in the passivation film, therefore, because electrolytical electric current focuses on the high point, so can carry out optionally electrodissolution.As a result, even smooth smooth and obtain the high minute surface of quality and reduce the amount of liquid that sticks on the metal surface thereby coarse metal surface also can become.And, generally can only obtain maximum height and be 1.0 microns surface roughness in the common buffing machine upthrow light time.

Above-mentioned bearing 9b and 10b are made by glass fibre reinforced fluorine resin, therefore, and the supporting position of axle and be supported the position and all carry out above-mentioned polishing to reduce the friction factor of liquid.

Be positioned at the Circulation pipe 11 on the support 3, import the inside of motors or stator seal closure 5 in order to the liquid that will partly discharge from housing flange 12.

The following describes the working procedure of canned motor pump with said structure.

When motor started, impeller 1 rotated.Along with the rotation of impeller 1, the liquid of pumping to be imported in the suction port and and send from exhaust port.Meanwhile, a part of liquid (calling " circulating liquid " in the following text) is introduced to filter 13 to filter this circulating liquid from housing flange 12.Filtered circulating liquid flows through the inside of Circulation pipe and enters in the roller bearing lid 14.Circulating liquid in the roller bearing that the veers away lid 14 flows through bearing 10b in the rotation and the gap between axle sleeve 10a again, flow through then the gap of 7 of stator cover 5 and rotor housings, flow through bearing 9b in the rotation and the gap between axle sleeve 9a again, at last, flow through the stabilizer of impeller 1 and be sent to the low-pressure section of impeller 1 ingress.

In above-mentioned working procedure, circulating liquid contacts with each part of motor when flowing, and lubricated also cooling bearing part is so that the control heat that motor coil produced.As mentioned above, because the friction factor of each part of bearing part is minimum, the temperature of circulating liquid can not be elevated to be used acrylic monomers institute not tolerate and makes the liquid of institute's pumping produce the degree of polymerization, thereby permission liquid circulates reposefully.

Fig. 2 is another embodiment who has " cooling mechanism " in the path of Circulation pipe 11.Specifically, be equipped with a housing 21 that takes up dry ice 20 in the path of Circulation pipe 11, the circulating liquid that flows through Circulation pipe 11 is cooled off by dry ice 20 within entering housing the time, and then imports in the motor or enter within the stator cover 5.According to this configuration, the cooling effectiveness of motor can further improve.The structure of other except that said structure is all similar to embodiment shown in Figure 1.

In addition, as a kind of method of controlling the heat that heat that motor coil produces and bearing parts friction cause, the way of the also available increase circulating liquid scale of construction replaces being provided with above-mentioned cooling mechanism.That is to say the internal diameter that adopt to increase Circulation pipe 11, or widen the gap of 5 on Motor Components rotor cover 7 and stator cover, perhaps increase the internal diameter of Circulation pipe 11 and strengthen rotor housing 7 and the way in the gap of 5 on stator cover.In this case, the generation of heat can make the total amount increase about 2.5% of circulating liquid or more way obtain effective control by adjusting above-mentioned internal diameter and/or gap.

And in the embodiment of the invention described above, the part that is supported is axle sleeve and Thrust ring.But, should be noted that the part that is supported has more than and be limited to these above-mentioned parts that it can also be in axle sleeve and the Thrust ring any, and can comprise any one part of the axle part that is supported on the bearing.

In addition, in the embodiment of the invention described above, support accessory is made by glass fibre reinforced fluorine resin.Yet, should see that also used material is not only to be limited to glass fibre reinforced fluorine resin, as long as can satisfy manufacturing bearing required low viscosity, friction coefficient and enough intensity, also can be with fluororesin or other material arbitrarily.

Have, used refrigerant is a dry ice in the embodiment of the invention described above again, but also can select any other refrigerant for use according to the type of used circulating liquid, for example adopts a kind of fluorine Lyons, argon or freezing mixture etc. that substitute.

In addition, the liquid of the present invention of institute's pumping is acrylic monomers in the above-described embodiments, but also be not only limited to acrylic monomers, it can also be a kind of liquid of polymerisation, a kind of liquid and a kind of liquid that contains stickum that contains polymer of carrying out easily.

Obviously, from top explanation as can be seen, but the canned motor pump of the present invention usually liquid of the above-mentioned easy polymerization reaction take place of circulation or the circulating cooling liquid that viscous liquid is used as cooling motor.Therefore, motor-drive pump of the present invention can this class I liquid I of uninterrupted pumping.

Claims

1. canned motor pump, have an enclosing housing that covers a stator and a rotor, above-mentioned rotor has a rotor shaft, above-mentioned rotor shaft has the position of being supported, it is characterized in that, with the surface process electropolishing method polishing treatment that is supported the position on the contacted above-mentioned rotor shaft of flowing liquid in above-mentioned enclosing housing.

2. according to the canned motor pump of claim 1, it is characterized in that the support accessory that is used to support above-mentioned rotating shaft contains the bearing of being made by fluororesin or glass fibre reinforced fluorine resin.

3. according to the canned motor pump of claim 1 or 2, it is characterized in that above-mentioned canned motor pump is a kind of circular form canned motor pump of Circulation pipe of the inner body that has the exhaust port that connects pump case and an above-mentioned enclosing housing.

4. according to the canned motor pump of claim 3, it is characterized in that, in the circulation route of above-mentioned Circulation pipe, be provided with a cooling mechanism.

5. according to the canned motor pump of claim 3, it is characterized in that the gap between the outer wall of the internal diameter of above-mentioned Circulation pipe and/or the rotor housing of above-mentioned canned motor pump and the inwall of stator cover is decided according to the circulating liquid scale of construction of normal circulation.