CN1030815A

CN1030815A - A kind of automatic liquid feeding priming type centrifugal pump that is used to carry dangerous liquid, particularly radioactive liquid

Info

Publication number: CN1030815A
Application number: CN88103780A
Authority: CN
Inventors: 雅克·多尔福斯
Original assignee: Societe Generale pour les Techniques Nouvelles SA SGN
Current assignee: Societe Generale pour les Techniques Nouvelles SA SGN
Priority date: 1987-06-22
Filing date: 1988-06-22
Publication date: 1989-02-01
Also published as: JP2637477B2; BR8803160A; CN1015126B; EP0296952B1; KR890000795A; CA1325552C; KR960016790B1; JPH01117994A; FR2616853A1; EP0296952A1; ES2030184T3; DE3868719D1; FR2616853B1

Abstract

The present invention relates to a kind of rectilinear automatic liquid feeding starting centrifugal pump that is installed under the protection apron.This pump comprises the fixing bowl-shape pump housing that is welded on the pipeline and the moving element that can all extract out from the top.Fluid motion mechanism wherein comprises: the impeller with radial blade that is driven by drive motor, above-mentioned impeller rotates between two dividing plates, one is the lower clapboard with inlet hole, and one is the upper clapboard that has a drain aperture in the terminal that the one side relative with impeller has oval-shaped groove, a groove.

Description

A kind of automatic liquid feeding priming type centrifugal pump that is used to carry dangerous liquid, particularly radioactive liquid

The present invention relates to a kind of dangerous liquid that is used to carry, particularly have the centrifugal pump of the automatic liquid feeding starting of radioactive fluid.

Between two containers (cistern, equipment or the like), to the dangerous liquid of high-level container pumping, particularly during radioactive liquid, must take special protective measures from the low level container.

Its measure is as follows:

A) pump must be installed on the low level container.The caused leakage of any damage of pump can not cause overflowing of all liq in the container like this.

B) delivery spout can not be immersed in the liquid of high-level container, and the obstruction of pump or leakage can not produce siphonage in high-level container like this.

C) need not disconnect the pipeline that connects between two containers, pump just can disassemble.

D) when using this pump, during especially for radioactive liquid, it can be placed between two containers, and pump and pipeline are in the shielded chamber.

Preferably pump is installed on the roof spacer of shielded chamber, vertical drive shaft links to each other easier like this maintenance by the outer motor of dividing plate and shielded chamber.

The pump of such conveying liquid and some other advantage existing description the in F.P. № .7624748 that has thereof.

Pump described in this patent includes: be welded on the bowl pump housing of pump outside, be provided with turnover pipeline and pump inner fluid mechanism (comprising sealing) in the bowl pump housing, the vertically dismounting of the bowl pump housing is so that shield.

The present invention equally is a kind of centrifugal pump with aforesaid F.P., but the difference of internal flow mechanism makes this pump more be applicable to the low flow rates of fluid of transmission.(such as: 2 meters ³/ rank hourly).

The present invention is the centrifugal pump that is placed in a kind of rectilinear automatic liquid feeding starting under the cement board.This pump comprises a fixing bowl-shape pump housing welded together with importing and exporting pipeline and a fluid motion mechanism that closely is placed in the pump housing and is easy to extract out from the top.It is characterized in that fluidic component comprises: one has the impeller of radial blade by the opposite side drive motor of cement board, above-mentioned impeller the lower clapboard with inlet hole and another piece and the impeller opposite side terminal that has ellipse garden connected in star, a groove have between the upper clapboard of discharging fluid orifices and rotate.

Description below with reference to figure can make us more easily understand the present invention.

Fig. 1 is the vertical cut-away schematic view of pump and motor position on cement board.

Fig. 2 is the vertical cross section of this pump.

Fig. 3 is the perspective exploded view of fluid motion mechanism.

Fig. 4 is the perspective view of closed trenches in the hydraulic mechanism.

Fig. 5 is the vertical sectional view of removable component.

Fig. 6 is the enlarged view of the vertical section of fluid motion mechanism.

Fig. 7 is a sealed structure chart.

Referring to these figure.Fig. 1 has provided common layout, and the top 1 and the bottom 2 of shielded chamber are separated by cement board 3.Shielded chamber 2 comprises the maccessiable dangerous substances of the person.Last shielded chamber 1 can clean and safeguard.

Pump 4 is installed in shielded chamber 2 under the cement board, and motor 7 is installed in shielded chamber 1.

The installation of motor comprises the member 8 of a prison house formula, transmission shaft 6 and ball bearing case 5.One coupling is installed between motor and the axle.

The same with common pump, this pump also is the bowl-shape outer pump case by connecting duct, dismountable part, and the fluid motion mechanism of rotation, ball bearing, fixing seal and rotary seal are formed.

Pump comprises pump case, its shape such as cylindrical body, and pump housing upper end open part is fixed on the cement board 3 by flange, and the lower end is sealed.

One of the conduit mouth (being welded on the pipeline) that comprises three welding on the pump housing is that 18, one of suction leads are output duct 24 and exhaust manifolds (figure does not show).

Suction lead is with required to be pumped the pipe that fluid is connected welded together.

Output duct is welded on the pipeline of output fluid.

Exhaust manifolds are connected on the vent systems.

The pump housing must be fixing with whole pipeline.

The hydraulic mechanism of pump all is arranged in the pump housing, the part that can be drawn out of comprises that (above-mentioned mobile mechanism can be drawn out of by auxiliary recalling of moving part for rotating machinery and mobile mechanism, but in the working procedure of pump, that yes is fixing in above-mentioned mobile mechanism).

Fig. 2 has represented rotational motion mechanism, and Fig. 3 represents the view sub-anatomy of impeller.

Fig. 2 and 3 has shown the composition of rotating machinery,

-one live axle 6 is fixed on the upper end of pump by ball bearing 25.

-Sealing 9(or be rotating seal).

The lower end of-axle is an impeller 13, and the blade of radially placing above it is rectangular to be arranged regularly.Arc angle is generally got 15 ° 10 °-30 ° scope between two adjacent blades.Clearly, impeller comprises circular entity 34(Fig. 6), (not comprising blade).

Fig. 2,3,4,5 and 6 represents moving link, and in detail some is said, and it is one to center on the part of a solid of rotation of vertical drive shaft 6.

The top of motion comprises a terrace part, and it abuts against on the planar section of the corresponding bowl-shape pump housing with it, the tightness (Fig. 5) between guaranteeing by two

Sealings

30 and 32.

The lower end of motion is a cylindrical shell, and its side is limited by sidewall 11.Movably basal disc 14(is fixing by screw 33 below, opens a discharge orifice that has flow jeting port 16 on Fig. 6).Upper plate 10 has hole 29, and the core of mobile mechanism forms one round live axle 6 and places the filling sealed space.One horizontal baffle 20 is arranged in cylindrical housings, and it is divided into two parts with enclosure interior, and impeller 13 is placed in the lower end, and upper end 12 forms the transmission cavity volume.

Aforementioned barriers 20 defines the cavity of resorption of placing impeller 13, and institute's dividing plate of mentioning and its effect will be hereinafter with reference to Fig. 4 and Fig. 6 descriptions among the present invention.

It is tabular that this dividing plate is thick circle, and its lower surface has the dividing plate after groove 23(Fig. 4 shows upset, so that express groove).

The end of groove has 21, the second holes 22, hole of running through dividing plate 20 to be positioned on the same radiation radius in first hole 21, but more approaches the center, equally also passes dividing plate 20.

In the upper end (particularly shown in Fig. 2 and 3), a platelet 17 is separated

hole

21 and 22.

Groove 23 is looped around on the parallel surface 35.

The groove 23 that Fig. 6 shows resembles ellipse half, as same " blue sub-handle ".

The interior lower end section that Fig. 6 also demonstrates sidewall 11 is concavity 31, and it makes the section profile continuity of groove 23.

The relative dimensions of groove 23 and impeller 13 (radially) very clearly is labeled among Fig. 6, this blade must be in groove width 3/4 to 2/3 between.

R _aBe the maximum radius of impeller, Re is the external diameter of groove, the internal diameter that Ri is groove, and following formula is set up so:

Re- 1/4 （Re-Ri）＞Ra＞Re- 1/3 （Re-Ri）

In addition, the radius R of the wheel hub 34 of impeller 13 _mSignificantly than groove internal diameter R _iLittle.

Fig. 6 expresses between impeller 13 and dividing plate 20, the lower clapboard 14 certain interval.This gap must allow impeller freely to rotate, simultaneously again must be little airtight with the both sides that guarantee impeller to forming surface tension.

Generally getting 0.1mm is gap width.

The correct running of pump of the present invention comprises the situation that can make the professional workforce satisfied, promptly see Fig. 2 and 7 at suction chamber 19() and output cavity 12(see Fig. 7) between be separately independent, that is to say the good isolation effect, suction chamber 19 is between the bowl-shape pump housing and motion.

Sealing is installed between the inner convex platform 39 of the sidewall 11 and the pump housing, or metal ring 38 is placed in the

groove

36,37 of sidewall 11, and metal ring is preferably two layers.

Between groove bottom and metal ring internal diameter, stay a gap to be absolutely necessary obviously, help the assembling of pump like this.

Metal ring be sealed with a bit that slight leakage allows, consequent shortcoming is exactly that the flow of pump has reduced but is very slight.

The method of operation of pump constructed in accordance is a kind of centrifugal pump of automatic liquid feeding priming type, will describe briefly below.

The static pump of liquid that comprises enough submergence impellers is as starting point, above the pump housing and the suction pipe place have air.

Along with rotation, fluid enters output cavity 12 by hole 21 from circular groove 23.The volume of liquid is replaced by the air from the same volume of conduit mouth 16.

The rotation of impeller mixes water and air, and unsettled emulsion 21 passes through from the hole.In output cavity 12, be separated into from the hole 29 air of leaving away and 22 fall to the water of impeller from the hole.

Dividing plate 17 separates two holes to prevent that before air and water separation, the emulsion of mixing enters hole 22.

Up to air from intake line after the outbound course emptying, same circulation restarts.Liquid is inhaled into and is full of pump and resembles the general fluid characteristic that pump had with peripheral through hole, and the liquid of suction enters the bottom of pump through conduit 16, enters chamber 12 by hole 21 again, then through the hole 29 enter output cavity 12 ', enter output duct 24 at last.

Operating pump is installed in the top of the cistern that liquid is housed, owing to without any valve, got rid of and leaked the harm that causes.

Obviously, when this pump of dismounting, remove motor earlier, be the totality mechanism of coupling and pump then: comprise mobile mechanism and rotary component, they can be extracted from the hole on isolating slab.Because pump is installed in the top of cistern, the pump case welded together with pipeline still stays put, thereby do not have liquid to spill.

In still staying the pump of extraction, radioactive liquid in the part time, just must take safeguard practice to personnel.

The size and the feature of the pump of making by the present invention are as follows:

-impeller diameter is 90mm, and thick is 10mm, is made up of 24 blades.

The rotational speed of-live axle:

2900 rev/mins; The head of aforesaid pump when the pumping cooling water be than low 6.5 meters of this pump, and during 46 meters of lifts, but dependable flow is 1500 liters/hour, if when lift is 25 meters, but dependable flow is 2000 liters/hour.

Same impeller uses on common centrifugal pump, and it produces the hydrodynamic pressure lift than low 4 times of this pump.

Claims

1, a kind of rectilinear automatic liquid feeding priming type centrifugal pump.It is installed under the cement board, comprises being welded on the motion of importing and exporting the stationary housing on the pipeline and can extracting from the top.

Fluid motion mechanism comprises the impeller with radial blade that is driven by drive motor, and impeller has the horizontal ellipse groove at the lower clapboard that has inlet hole with in impeller one side, and the end of groove has between the upper clapboard of draining hole and rotates.

2,, comprise on the dividing plate of upper end closed wherein and second hole of above-mentioned first hole on same radius that just it is from axis more recently according to the pump of claim 1.And at the another side of the dividing plate relative with impeller, a plank with described first, second hole separately.

3, according to the pump of claim 1 and 2; Wherein the lower end section of the grooved profile of shape such as the sub-handle shape of indigo plant and motion sidewall couples together the section extension of groove.

4, according to the pump of claim 1 to 3, wherein the metal ring of laying in the groove of motion sidewall is used to guarantee airtight between the bowl-shape pump housing fixed and the moving link.

5, according to pump any among the claim 1-4, the radius R a of impeller wherein, the external diameter Re of groove, internal diameter R _iConnect by following inequality:

Re- 1/4 （Re-Ri）＞Ra＞Re- 1/3 （Re-Ri）