CN1277328A - Barrel-type shell turbopump - Google Patents

Abstract

Inside a casing, there are one shaft to support vane wheels and one smooth passage comprising arched slots on the surface of shaft between vane wheels. There are an open-mouthed ring sleeve in the interval between open-mouthed rings, a shaft seal installed on the casing and bearings installed on the end caps. The outer casing and the inner casing are connected via metal part in the shoulder part, and fixed via prestressed elastic part. Thus, the pump can maintain its high efficiency and high reliability even in high temperature, high pressure, high speed and other severe working states. The pump has small volume and high maintenance performance.

Description

Barrel-type shell turbopump

The barrel-type shell turbopump that the present invention and the atomic pile feed water pump that is suitable for closing thermal power generation field boiler feed pump or atomic power station etc. use is relevant.

Be provided with in the barrel-type shell turbopump of the prior art by shell that is called as cylinder and chamber that the housing capping that the opening of this outer casing end blocks is constituted, being used in the configured chamber transmitted the rotating shaft from driving machine power, a plurality of impellers of in rotating shaft, installing, and be contained in the inner housing etc. that the fluid that flows out from impeller is carried out the runner of rectification that has in the chamber.The bearing portion of supporting above-mentioned rotating shaft two ends is installed in the above-mentioned housing capping, and is provided with gland seal device between above-mentioned impeller and bearing portion.

The pump of said structure mainly is used in the factory that handles high-temperature high pressure water.In recent years, along with the high capacity of factory, pump is constantly to high-power, high temperature, the development of high pressure aspect, nor the ground that breaks is to making small-sized high rotating speed development of pump.

The 1st purpose of the present invention provides and a kind ofly can reach miniaturization and high efficiency barrel-type shell turbopump.

The 2nd purpose of the present invention provides a kind of barrel-type shell turbopump that is suitable for that can stand harsh operating conditions such as high temperature and high pressure.

When providing a kind of the assembling, the 3rd purpose of the present invention adjust the barrel-type shell turbopump of the concentricity of rotor and housing easily.

The 4th purpose of the present invention provides, and thereby a kind of high concentricity precision that can often keep rotor and housing can stand at a high speed, the barrel-type shell turbopump of high pressure and hot operation.

In order to reach above-mentioned the 1st purpose, the invention provides at the pump described in the claim 1 described later.

And in order to reach above-mentioned the 2nd purpose, the invention provides at the pump described in the claim 2 described later.

In order to reach above-mentioned the 3rd purpose, the invention provides at the pump described in the claim 3 described later.

And then, in order to reach above-mentioned the 4th purpose, the invention provides at the pump described in the claim 4 described later.

Also can implement the present invention in the barrel-type shell turbopump that underway section drawn water.The example of this pump is just like the structure described in the following claim 5.

In the described pump of claim 1 owing to be provided with guide vane more than 3 at diffusion part, and in backwater channel, be provided with backwater blade more than 3, so be difficult for being subjected to foozle or eccentric influence, pump at rated flow point needless to say, even the radial thrust (bending force) that acts in the rotating shaft is diminished.Therefore, because the bending force that rotating shaft is born diminishes, its rigidity also diminishes, thereby can make the rotating shaft variation in diameter, so can make whole pump housing miniaturization.In addition, on the rotating shaft surface between impeller, form circular-arc grooving again, utilize these groovings to form slick and sly passage, the diameter of axle at circular-arc grooving place is arranged for big because the diameter of axle of installation impeller generation stress raiser is more above-mentioned again, so even pump miniaturization constantly also can have broad circulation passage, not only can accomplish to make the fluid rectification high efficiency of impeller eye, and grooving can also relax stress and concentrates.

Pump described in the claim 2, make between trip ring sleeve and the trip ring gapped or contact with the trip ring light pressure, the trip ring sleeve is assemblied in the rotating shaft by packing ring with spindle nut, therefore the end thrust of balancing sleeve is mainly born with trip ring, because the power of passing on trip ring sleeve or axle big envelope tube or the spindle nut reduces, so can prevent that the load that acts on the axle is excessive.Particularly, because the service condition that high temperature, high pressure etc. are harsh, under the situation of the dimensional changes of the thermal expansion of the equalizing feature that rapid fluid temperature (F.T.) and variation in pressure produced, pressure distortion etc., trip ring also can absorb this distortion, and trip ring also can be dealt with pressure surge in the usual running and the end thrust that produces changes.Like this, owing to the high temperature of pump, high-pressure trend and additional all interference produce all distortion or the load of equalizing feature, the load that acts in the rotating shaft is alleviated, so can improve the degree of reliability of pump significantly.

Pump described in the claim 3, in difference installation shaft seal apparatus and bearing means in frame or housing capping, bearing means can be separated in a circumferential direction, when the gap of the rotation sliding parts between impeller and balancing sleeve is determined in pump housing assembling back actual measurement, the state that gland seal device is being removed, make shaft support on bearing means, owing to remove the part of discerptible bearing means, just can easily detect the gap at end thrust alleviator place and the gap between first order impeller and the inner housing, thereby assembling the time can easily be carried out the adjustment of rotor and housing concentricity.

Pump described in the claim 4 makes frame contact at shoulder portion metal with inner housing, seals the fluid of outflow simultaneously with prepressing elastic.And, the occasion of the barrel-type shell turbopump that underway section drawn water, because prepressing elastic is disposed more with arranging, pressure and the pressure difference that acts on the inner housing both ends of the surface by means of prepressing elastic, promptly suck and press and the power that difference produced of discharging pressure, in the running of pump, can be pressed in inner housing on the frame securely, and can seal the liquid stream that released liquor spills to suction port.And the difference of the axial thermal expansion that is produced by the temperature difference of inner housing and frame can be absorbed by the distortion of prepressing elastic, thereby the excessive thermal stress of inner and outer shell can not take place.Like this,, can keep the coaxality of rotor and housing to be in frequent highi degree of accuracy state, can make pump carry out high speed, high pressure, high temperature operation owing to carry out the location of inner housing opposite shell body by means of the Metal Contact of the shoulder portion of these housings.

Fig. 1 is an embodiment's of a barrel-type shell turbopump of the present invention longitudinal section.

Fig. 2 is near the amplification view of the part impeller shown in Fig. 1.

Fig. 3 is the amplification view of the end thrust alleviator shown in Fig. 1.

Fig. 4 is the explanation adjusted of pump when assembling rotor and the housing concentricity among Fig. 1 with figure, is near partly the amplification view end thrust alleviator.

Fig. 5 is the explanation adjusted of pump when assembling rotor and the housing concentricity among Fig. 1 with figure, is near partly the amplification view first order impeller.

Fig. 6 is an inner housing amplification view partly shown in Figure 1.

Fig. 7 uses the longitudinal section that the barrel-type shell turbopump embodiment of the chamber of drawing water is arranged of the present invention.

Below, with reference to the description of drawings specific embodiments of the invention.

Fig. 1 is an embodiment's of a barrel-type shell turbopump of the present invention accompanying drawing, in the chamber that the frame 1 that is called as barrel-type casing and housing capping 1A with the sealing of one end form, set by a plurality of level 3 inner housings that constitute 5, in this inner housing 5, holding rotating shaft 6 and a plurality of (5 grades) impeller 7 that is installed in the rotating shaft.In the inside of inner housing 5, form the passage 50 (Fig. 2) of the liquid conductance of an impeller 7 outflows to next stage impeller 7, guide vane 4 is set on the diffusion part of passage 50, in returning water channel, be provided with and return wiper blade 2.Numeral 10 expressions are held and are received the discharge chamber of the high-pressure liquid that flows out from impeller 7, and this discharges chamber 10 and is connecting exhaust port 12.Above-mentioned frame 1 is communicated with the discharge chamber 10 of high pressure with annular gap 10A between the inner housing 5.Numeral 13 expressions suck the suction port of fluids, are directed to first order impeller 7 through last current plate 30 with following current plate 31 rectifications from the fluid of suction port 13.Contain the end thrust alleviator 8 of balancing sleeve isoequilibrium parts in the axial arranged outside of impeller 7, the axially position in the outside again at this device 8 sets gradually in rotating shaft 6 and contains a gland seal device of big envelope tube 14 and bearing means 16.In the axial outer fix of first order impeller 7, in rotating shaft 6, set gradually gland seal device 15 and bearing means 17 similarly.

Fig. 2 has represented the diagrammatic sketch that a near impeller 7 parts shown in Fig. 1 are amplified.An impeller 7 has equally spaced 5-7 blade 7A in a circumferential direction, the fluid that flows out from this impeller by uniformly-spaced be provided with at the diffusion part circumferencial direction more than at least 3, best 6-11 guide vane 4 and make pressure recovery, be used in then return in the water channel along the circumferential direction uniformly-spaced be provided with more than at least 3, preferably 7-12 is returned that wiper blade 2 is carried out rectification and the impeller 7 that flows into next stage, and blade 7A, 4,2 optimum number are respectively 7,9,10.On a plurality of particle sizes part of rotating shaft 6, impeller 7 usefulness are circumferentially located the key 6B of usefulness and the trip ring 6c that axial restraint is used, and (give positioning and fixing respectively, trip ring 6c is the structure of cutting apart at circumferencial direction two, is used for preventing that impeller 7 from shifting to suction port one side to rotating shaft 6.On rotating shaft 6 surfaces between a plurality of impellers 7, form circular-arc grooving 6A constituting level and smooth passage, can carry out rectification the liquid stream of the suction portion of each impeller 7.

Present embodiment, it or not the form that the fluid that flows out from an impeller is imported the next stage impeller with volute, but the liquid stream that an impeller 7 flows out is used the diffusion part with 3 above guide vanes 4 and the form that water channel imports next stage impeller 7 of returning of returning wiper blade 2 more than 3 is arranged, for the rated flow point of pump needless to say, even in the partial discharge territory, since along the circumferential direction equably the radial fluid thrust in rotating shaft 6, the bending force that acts in the axle commentaries on classics 6 is diminished, the rigidity of axle 6 can reduce as a result, thereby the diameter of rotating shaft 6 reduces, so can accomplish to make pump miniaturization integrally.For the liquid stream that flows out from impeller being carried out rectification and being provided with the pump of volute,, therefore need to strengthen the diameter of rotating shaft in the partial discharge territory because of the radial thrust that acts in the rotating shaft becomes greatly.And in the pump that is provided with diffusion part of the present invention, when guide vane or return wiper blade and be two and be subjected to foozle or eccentric influence when following, the radial thrust that acts in the rotating shaft 6 is diminished.For this reason in the present invention, making guide vane 4 is more than 3 with returning wiper blade 2, and the equally spaced configuration along the circumferential direction of these blades.And, owing to have stress to concentrate in the part that the rotating shaft 6 of blade 7 is installed with key 6B, so need to strengthen the diameter of rotating shaft 6.In the present invention, it is essential big that the intensity of axle 6 diameters at the position of key 6B is arranged, and in the part of the rotating shaft 6 of being unkitted key, be between the impeller 7 part and the part that key 6B is arranged mutually specific stress concentrate less, can guarantee big aisle spare is partly arranged by on the surface of this part rotating shaft, cutting out circular-arc grooving 6A at impeller eye, also form simultaneously a level and smooth passage and the liquid stream of impeller eye portion is carried out rectification, can also relax the stress of axle by grooving 6A and concentrate.Like this, because the enforcement of the present invention in the pump of diffusion part is arranged, and thereby the circular-arc grooving 6A of formation forms level and smooth passage on the rotating shaft surface, the diameter that can make rotating shaft 6 reduces and makes the pump miniaturization, also make simultaneously the aisle spare expansion of impeller 7 ingress and can reach the rectification that impeller eye place liquid is flowed, and efficient is improved.

Fig. 3 is axial thrust alleviator 8 part amplification views among Fig. 1, end thrust alleviator 8 is by being installed in the balancing sleeve (equalizing feature) 81 in the rotating shaft 6 and being constituted forming close clearance and the close fit balancing sleeve 82 on the inside of housing capping 1A between the outer circumferential face of this balancing sleeve 81, numeral 83 expression confined equilibrium sleeves 81 axially movable trip rings, this trip ring 83 two are cut apart and are embedded in the groove 60 of rotating shaft 6 in a circumferential direction.The trip ring 83 that numeral 84 expressions prevent two segmenting structures is from the come off trip ring sleeve of usefulness of groove 60, the 84A of shoulder portion that forms on these trip ring sleeve 84 inner circumferential surfaces and the shoulder 6E of rotating shaft 6 join, limited sleeve 84 to trip ring 83 1 side shiftings, so, formed the axial clearance 85 between trip ring 83 and the sleeve 84.If this gap 85 is not set trip ring sleeve 84 is contacted also can with little surface contact pressure with trip ring 83.And in the present embodiment, between trip ring sleeve 84 and trip ring 83, form radial clearance 86.And between balancing sleeve 81 and trip ring sleeve 84, also form axial clearance 87.Trip ring sleeve 84, the axle big envelope tube 14A by constituting gland seal device 14 compresses at axle direction and uses shoulder 6E by means of pile being combined in spindle nut 32 (Fig. 1) in the rotating shaft 6, and 84A is with respect to axle 6 positioning and fixing.

Because above structure, even rapid fluid temperature variations and pressure oscillation are arranged, balancing sleeve 81 is because of thermal expansion, the dimensional changes that pressure distortion etc. produce, the end thrust of balancing sleeve 81 is mainly born by trip ring 83, just can reduce to pass to a trip ring sleeve 84 and the power of big envelope tube 14A, and the change of the end thrust that takes place because of pressure surge in the usual running is also mainly by trip ring 83 supportings.And then frame 1 is with uneven temperature deformation state running in a circumferential direction, balancing sleeve 81 and balancing sleeve 82 sliding contacts, even because of the heating of sliding causes balancing sleeve in the uneven distortion of circumferencial direction, trip ring 83 also can support deformation load.Like this, in the present invention,, can make the power that passes to trip ring sleeve 84, axle big envelope tube 14A and spindle nut 32 be reduced to zero simultaneously owing to, can prevent that trip ring 83 from falling of the fixing assembling of shoulder 6E, 84A of trip ring sleeve 84 usefulness with respect to rotating shaft 6.The result can prevent spool distortion of big envelope tube 14A and a little vibration, and the reliability of gland seal device 14 is improved.

And, in the present embodiment, owing to use the alleviator 8 of balancing sleeve 81 as end thrust, compare the portion that endwisely slips that does not have particle size with the situation of using Balance disc, even rapid fluid temperature (F.T.) change is arranged, pressure oscillation, pressure surge or the variation of circumferencial direction uneven temperature etc. also are difficult for taking place the sliding friction loss of sleeve 81 or the distortion of damage and axle 6, like this, owing to adopted the combination of balancing sleeve 81 with trip ring 83, compare with the form that male thread limits balancing sleeve with the shoulder with axle in past, its unfailing performance improves significantly, promptly, can alleviate the load on the parts such as acting on end thrust alleviator 8 and axle big envelope tube 14A, realize fully to deal with high temperature, the barrel-type shell turbopump of the interference that high-pressure trend added because of pump.

Fig. 4 and Fig. 5 are the part amplification views of pump when assembling explanation rotor and the concentric adjustment of housing do among Fig. 1.At first, the structure of explanatory drawing 1 present embodiment near the gland seal device rotating shaft 6 two ends 14,15, is assemblied in the bearing housing 14C, the 15C that are adorning gland seal device 14B, 15B in respectively respectively on housing capping 1A and the frame 1 removably.On bearing means 16,17, in bearing 16A, 17A be housed bearing housing 16B, 17B be installed in removably respectively on housing capping 1A and the frame 1.These bearing meanss 16,17, divisible at circumferencial direction, preferably level ceded territory to constitute in 2 minutes, the structure of these bearing meanss 16,17 makes that rotating shaft 6 can be by lower half portion support of bearing means under upper half part state that sheds bearing means 16,17.Bearing means 16,17 and gland seal device 14,15 are fixed on housing capping 1A and the frame 1 separately.

The concentric adjustment of rotor and housing, when assembling is before state is installed on housing capping 1A and the frame 1 as shown in Figure 1 gland seal device 14 and 15, and lower half portion of bearing means 16,17 is installed in as Fig. 4 or Fig. 5 on housing capping 1A or the frame 1.So, the staff clearance gauge 21 is inserted gap (Fig. 4) between balancing sleeves 81 and the balancing sleeve 82 or first order impeller 7 entry end excircle 7A and be entrenched between the sleeve pipe on the internal surface of inner housing 5, be supported in rotating shaft 6 under the state on lower half portion of bearing means 16,17, just can measure gap at an easy rate at the entry end outer peripheral surface of the several local balancing sleeve 81 of circumference and gap between the balancing sleeve 82 or first order impeller 7.Like this, because the present invention makes concentric adjustment to rotor and housing easily when assembling, just can be adjusted into suitable minimum clearance to the above-mentioned gap of rotor and housing and assemble with one heart.Set consider processing and the size gap of assembly error after, if this gap is excessive, moisture film rigidity with the sliding parts gap reduces in the time of will causing high speed problems such as shaft vibration increase because pump efficiency descends.And when rotor and housing are assembled into eccentric state, when the fluid temperature (F.T.) rapid change, the gap of sliding parts becomes narrow especially on eccentric direction, will cause wearing and tearing or damage, if use the present invention then can prevent these problems, can accomplish high efficiency, can prevent from simultaneously to cause the vibration increase of disturbing when increasing because of speed up and high temperatureization.

After above-mentioned concentric adjustment finishes, lower half portion of bearing means 16,17 is unloaded earlier, installation shaft seal apparatus 14,15 is fully assembled bearing means 16,17 at last again.So far, assembling is finished.

Fig. 6 is the amplification view of the inner housing 5 represented among Fig. 1.On the excircle of the suction side of inner housing 5, form shoulder 5S.The mutual Metal Contact of shoulder 1S of shoulder 5S and housing 1 axially and radial engagement and with respect to housing 1 inner housing 5 positioning and fixing of entry end.And on the discharge side end face of inner housing 5, acting on the head pressure 5r of pump respectively, and on the discharge side end face of inner housing 5, acting on the head pressure 5x of pump, under these two action of pressure, inner housing 5 has formed the structure of pressing to Fig. 6 left.And, between inner housing 5 and housing capping 1A, be provided with elasticity pre-press 5A such as flexible plastics, even become the structure that when the pump stall, also can press to inner housing 5 left of figure.Also can be arranged on the parts that constitute inner housing 5 to this elasticity pre-press 5A is in the axial clearance at different levels 3, with regard to the Metal Contact part of above-mentioned shoulder 1S, 5S, the surface pressure of its Metal Contact part will be designed to guarantee abundant sealing, so that the water that the pressure of discharging is arranged that the annular gap 10A from being communicated with discharge chamber 10 between the inner and outer shell 1,5 is flowed out flows into suction port 13 1 sides.

In the present embodiment, because with respect to inner housing 5 and these shoulders of frame 1 usefulness 5S, the 1S metal joins and locatees, and compares with the design with location such as gasket seals in past, its advantage is the concentricity that can keep rotor and housing frequently.And then if sandwich the elastic material of gasket seal etc. between the suction side of frame 1 and inner housing 5 shoulder 1S, 5S, then the fixed bearing of inner housing will be insufficient, can cause problems such as the vibration of inner housing 5 and the distortion of inner housing arcuate heat.Present embodiment has solved this problem, and the pump of present embodiment is suitable for high-pressure service, and because component parts is few, the maintainability excellence.

Fig. 7 expresses that the present invention is suitable for is provided with the embodiment of barrel-type shell turbopump of the chamber of drawing water of fluid of the intermediate pressure of the suction pressure that is full of pump and head pressure between frame 1 and inner housing 5, now only the difference of embodiment shown in itself and Fig. 1-6 is illustrated.Among Fig. 7, numeral 9 expressions are located at the chamber of drawing water of the intermediate pressure fluid of the suction pressure that is full of pump between frame 1 and the inner housing S and head pressure, and 90 are provided in a side of the pump mouth that links to each other with the above-mentioned chamber 9 of drawing water on the frame 1.In boiler feed pump, this pump mouth 90 imports the fluid of the intermediate portion of pump and heats in the sprinkling system.The draw water axial two ends of chamber 9, with the 1st joining portion 5P of the shoulder 5S on the inner circumference of suction side excircle that is located at inner housing 5 respectively and frame 1,1S Metal Contact, with the shoulder 5T on the inner circumference that makes the excircle part that is located at inner housing 5 intermediate portions respectively and frame 1, the 2nd joining portion 5Q sealing of 1T Metal Contact.In the axial clearance of the discharge side end of inner housing 5 and above-mentioned housing capping 1A, or in the face of in the axial clearance between the structure member (level 3) of the inner housing 5 of discharging chamber 10 the prepressing elastic 5A that axially pushes down inner housing 5 being set.And in the face of the structure member of the inner housing 5 of the chamber 9 of drawing water mutually too axially can fine motion in the face of the structure member of the inner housing 5 of discharging chamber 10, at the inner housing structure member on 9 opposites, chamber of drawing water and discharge in the axial clearance between the inner housing structure member on 10 opposites, chamber, or in the axial clearance between the inner housing structure member on 9 opposites, chamber of drawing water, the auxiliary prepressing elastic 5B that axially pushes down these shell construction parts and use is set, draw water chamber 9 usefulness, two 5P of Metal Contact portion of place and 5Q are to suction port 13 and discharge chamber 10 sealings.

By means of this mode of structure, the present invention also is applicable to the barrel-type shell turbopump that is provided with the chamber 9 of drawing water.

Claims (2)

1. barrel-type shell turbopump, comprise: the frame of band suction port and exhaust port and seal the chamber of housing capping of an end of this frame, be installed in a plurality of impellers in the rotating shaft in this chamber, be arranged on above-mentioned rotating shaft and discharge the end thrust alleviator that equalizing feature is arranged of side end, and at the gland seal device that is located at the axle big envelope tube in the above-mentioned rotating shaft in the axial outside of this end thrust alleviator; It is characterized in that, be provided with:

Trip ring, it has limited moving axially of above-mentioned equalizing feature, and it is split into 2 with top in a circumferential direction;

The trip ring sleeve engages and limits to this trip ring one side shifting with the shoulder of above-mentioned rotating shaft when trip ring comes off here anti-, be arranged in this trip ring between formation axial clearance or contact with slight surface pressure with respect to this trip ring;

Spindle nut, it by above-mentioned axle big envelope tube above-mentioned trip ring sleeve pressing and fixing on the shoulder of rotating shaft.

2. barrel-type shell turbopump as claimed in claim 1, it is characterized in that: the suction port side end in above-mentioned rotating shaft also is provided with gland seal device and bearing means, above-mentioned two gland seal devices and two bearings device are installed in respectively in above-mentioned frame or the housing capping, and above-mentioned two bearings device is in the alienable structure of circumferencial direction.

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