CN85109623A

CN85109623A - Black box

Info

Publication number: CN85109623A
Application number: CN 85109623
Authority: CN
Inventors: 罗兰·托马斯·狄克逊
Original assignee: Sealing Devices Pty Ltd (au) 8 Burnie Avenue Dee Why New South Wales Austra
Current assignee: Sealing Devices Pty Ltd (au) 8 Burnie Avenue Dee Why New South Wales Austra
Priority date: 1985-11-29
Filing date: 1985-11-29
Publication date: 1987-06-03

Abstract

A kind of mechanical sealing assembly 11 that is used for the pump rotating shaft comprises to be had applying sealing surface 33,34 therebetween and is clamped in a static and rotating seal portion 31,32 with the axially movable hermetically sealed case 25 of rotating shaft.Some adjacency of sealing overcoat and bearing part moves axially to the pump case outside to stop overcoat, and then is supporting a dividing plate 40, defines a cavity 45 thus, has a kind of relative incompressible fluid in the cavity.The part of dividing plate outer surface is being born the effect of pump fluid pressure, and another part is supporting static seals 32 side relative with its sealing surface.Adopt this structure can finish sealing effectively and fully.

Description

Black box

The present invention relates to a kind of black box, more specifically say to relate to a kind of mechanical sealing assembly that is used to pass such as the rotating shaft of pump class pressurized container housing.

At the sealing problem between pump case and the rotating shaft, usually adopt the method for mechanical seal, this mechanical seal comprises a pair of Sealing with the applying sealing surface that is oppositely arranged, this has stoped the leakage of fluid between sealing surface substantially to Sealing, thereby has stoped fluid to flow through the sealing assembly.A usually relative pump case in these two Sealings is fixed, so Sealing that be referred to as to fix or static, and another Sealing then rotates with rotating shaft, therefore is referred to as rotating seal portion.

Mention traditional black box, people adopt various forms of biased members to keep the faying surface of sealing part to be in relative compaction usually, in case the fluid stopping body flows through the sealing assembly, leak.Yet, it is traditional that biased member adopted is that a constant power keeps the faying surface of sealing part to be in relative compaction, and the integrity of sealing part is a kind of special necessity that depends on the adequacy of this constant force and depend on this biased member, promptly, this biased member must not deteriorate into the degree that the power that is acted on is not enough to form suitable sealing, particularly occur in the pressurized container making the situation that hydrodynamic pressure is actually to be increased for some reason or other.

In addition, about traditional black box, must guarantee that the faying surface of Sealing forms suitable seal, this point is very important, and like this, the position of this rotary seal is in the particular importance that just seems aspect the effective work that guarantees the sealing assembly.Yet, in some cases, when the axial position of the rotating shaft of pump need be adjusted with respect to pump case, particularly when pump be when being used to aspirate a kind of centrifugal pump of mud, owing to when the grinding of solid particle makes the adjacent inner surface wearing and tearing of the impeller of this centrifugal pump and/or this pump case in the mud, just must adjust.When needs were adjusted impeller with respect to the position of pump case, the axial adjustment of impeller location was very difficult.

A kind of solution for the problems referred to above just provides a kind of pump, the adjustment of impeller is finished by an impeller shaft in this pump, this impeller shaft is bearing on the desk-top bearing part of tubular, this bearing part is bearing on the fondational structure successively adjustablely, and this fondational structure is movably with respect to the base of pump case.Yet because this impeller shaft will guarantee to allow the applying relation between the seal surface of mechanical seal interference-free, so this solution does not allow to adjust this impeller shaft.Further a kind of solution of problem is embodied in U. S. Patent the 3rd hereto, 977,737 and 4,509, in the embodiment in No. 773, an overcoat that supports this fixing seals here is installed on these adjustable bearing parts, like this, in fact this bearing part is axially to adjust by an opening on the pump case, and is sealed each other.Adopt this structure, when axially adjusting, the overcoat that is used for this fixing seals is along with this impeller shaft moves together, and two Sealings are mobile simultaneously, has so just kept the applying relation between its sealing surface, and has not needed to adjust respectively.

In any case, U. S. Patent 3,977, black box in 737 and 4,509,773 also comprises biased member, and also adopted constant power, that is, at U. S. Patent 3,977, black box in 737 has adopted spring action on a Sealing, at U. S. Patent 4,509, adopted an elastic ring in 773.

In addition, two U. S. Patents, 3,977,737 and 4,509, in 773 the black box, the overcoat that is used for this fixing seals need be rigidly connected to this bearing part with bolt, this bearing part is unallowed, the deflection that lacks suitable tolerance and do not allow the assembly center line of bearing part, and this rigid joint of while also can be sent to sealing surface to undesirable vibration by assembly and cause wearing and tearing, such as cracked and crackle, this can reduce its life-span.Moreover, cause after when installation, maintenance is particularly being aspirated mud with use, using a period of time under certain conditions and denude under the situation of getting rusty, all need to tighten or unclamp screw attachment,, brought very big difficulty at this moment for mobile screw so that finish the assembly and disassembly of element.

First aspect as the present invention's purpose just provides a kind of black box, the sealing assembly adopts a biasing force to keep the surface of sealing part to be in closely and is sealed and matched, and this black box allows biasing force along with the increase face of pressurized container fluid pressure increases in proportion gradually.

Therefore, according to a first aspect of the invention, a kind of mechanical sealing assembly that is used for rotating shaft is provided, this rotating shaft puts in this pressurized container by a kind of opening on the pressurized container wall, described black box comprises static and rotating seal portion, described Sealing has the sealing surface of applying, and be clamped in the hermetically sealed case, described hermetically sealed case is supporting a dividing plate to define a cavity thus, in this cavity, accommodate a kind of relative incompressible fluid, the part of described dividing plate outer surface is being born the effect of hydrodynamic pressure in the described pressurized container, another part of described outer surface is then supporting described static seals, and bearing position is the side relative with the sealing surface of static seals.

Adopt this structure, the increase of any hydrodynamic pressure all can make the pressure that acts on the described dividing plate increase in pressurized container, and then increased the pressure of dividing plate inner fluid gradually, therefore pressure then acts on the described static seals like this, has just increased the sealing force between the sealing surface of sealing part.

As the second aspect of the present invention's purpose, avoid the rigid joint between the overcoat that is used for this fixing seals and this bearing part exactly.

According to a second aspect of the invention, a kind of mechanical sealing assembly that is used for rotating shaft is provided, this rotating shaft has an axial adjustable bearing part, and this rotating shaft puts in this pressurized container by an opening on the pressurized container wall, described black box comprises static and rotating seal portion, described Sealing has the sealing surface of applying, and be clamped in the hermetically sealed case, the sealing overcoat is axially movable with described rotating shaft, and the part of the part of wherein said hermetically sealed case and described bearing part adjacency is to stop this overcoat to move axially to the outside of described pressurized container.

Adopt this assembly, hydrodynamic pressure in pressurized container and the hydrodynamic pressure that acts on an end of the overcoat that is used for the sealing assembly then force this overcoat and sealing assembly axially outwards to move, the other end up to this overcoat contacts with this bearing part, this just no longer needs any rigid joint between this overcoat and this bearing part, thereby has avoided aforesaid because the caused problem of rigid joint.

With reference to the most preferred embodiment of accompanying drawing description, wherein in conjunction with two aspects of the present invention:

Fig. 1 is the partial cross sectional side elevation view of a pump-unit bearing part and mechanical sealing assembly being combined according to the present invention; With

Fig. 2 is the zoomed-in view of the mechanical sealing assembly of a Fig. 1.

Fig. 1 has with reference to the accompanying drawings shown a pump-unit 10 here, and combines the mechanical sealing assembly 11 among the present invention, and this pump-unit 10 comprises a centrifugal rotor 12, and it such as a motor (not showing), drives rotating shaft 13 driven rotary by motor.This rotor 12 is arranged in a housing 14, and this housing is connected in the supporting 15.This housing 14 has an import 16, enters in this housing by this inlet fluid, and this housing also has an outlet 17, discharges from this housing by this outlet fluid.Rotating shaft 13 is by a sleeve 18 supporting location, and this sleeve 18 is supported by a fixed infrastructure 19 successively, and adjustable to axial.This housing 14, supporting 15 and fondational structure 19 all are fixed together.Sleeve 18 is supporting the roller bearing of opening in a pair of gap 20 and 21, and each bearing is each people's bearing bracket stand 22 and 23 adjacency from top to bottom all, and this bearing bracket stand is tightened on this bearing part by bolt 22a and 23a successively.Bearing 20 and 21 is supporting rotating shaft 13, and bearing bracket stand 22 has a dust sealing 24 and connects with it, and surrounds rotating shaft 13.Set mechanical sealing assembly 11 is used for substantially preventing that fluid from leaking along being full of rotating shaft 13 from pump case, and the sealing assembly surrounds rotating shaft 13, and between bearing bracket stand 23 and pump case, and then be bearing in the hermetically sealed case 25.

It is therebetween clearance C that rotor 12 allows the adjusting play with respect to the axial adjustment of pump case 14, this axial adjustment is by moving axially sleeve 18, and then has moved that this bearing part, rotating shaft and rotor finish.As shown in Figure 1, this sleeve is provided with an outside projection 26, and this projection has passed an elongated slot 27 in the fondational structure 19, and has internal thread in this projection 26, to hold a screw 28, this screw is axially fixed on the fondational structure 19 by space washer 29 successively.Sleeve 18 is connected on the fondational structure 19 by bolt 30, and this bolt 30 passes the slotted eye (not showing) in the sleeve 18, enters the spiral hole (not showing) in the fondational structure.When unclamping bolt 30, rotary screw 28, then the axial position of sleeve 18 just can be moved together with rotating shaft 13 and rotor 12, and with adjusting play C, after this firm again bolt 30 just can be at these parts of adjusted fixed-site.

This mechanical sealing assembly comprises pair of

seal members

31 and 32, and the sealing part surrounds rotating shaft 13 with the form of seal ring, and they can adopt suitable material forming, such as the alpha silicon carbide (Alpha Silicon Carbide) that adopts sintering.The sealing part has the

sealing surface

33 and 34 of the overlap joint of fitting.As depicted in figs. 1 and 2, Sealing 31 is connected on the tubular axle sleeve 36 by a coupling ring 35.This tubular axle sleeve 36 surrounds rotating shaft 13 and together rotates with rotating shaft 13 and put in the pump case, fits with adjacent side in the rotor 12.Fixing or static Sealing 32 is connected on the hermetically sealed case 25 by a partition component 37, the sealing overcoat passes opening and enters in the pump case, seal ring 38 is installed in the groove 39 around this opening, sealing the outer surface of overcoat, carry out relative moving axially outward but however but allow sealing to be enclosed within the opening of this pump case.

As shown in the figure, hermetically sealed case 25 far-ends and bearing bracket stand 23 are fitted, and make it to maintain by the hydrodynamic pressure on the end that acts on hermetically sealed case 25 in the pump case, so just avoided the rigid joint that between hermetically sealed case and bearing part, adopted in the above-mentioned U. S. Patent, connected by bolt at the more noisy parts of U. S. Patent.Do not adopt the benefit that is fixedly connected to be to allow to lack the deflection of suitable tolerance and permission assembly center line, and both avoided the difficulty of connection and demounting bolt connection, avoided transmitting the vibration that may cause that sealing surfaces damages again.

In order to stop the sealing assembly to rotate together in company with rotating shaft, along the circumferential clearance of hermetically sealed case 25 have several notches 25a, wherein block is served as with regard to the end that is embedded in notch in the termination of bolt 23a, in order to the rotation of prevention hermetically sealed case, thus the rotation of prevention sealing assembly.

As previously mentioned, this fixing or static Sealing 32 is by partition component supporting, and this partition component comprises a dividing plate 40, and it is shaped by neoprene or similar material, remains on and hermetically sealed case 25 corresponding positions by a retaining member 41.This dividing plate 40 sectional shape that takes the shape of the letter U, the free edge of its U-shaped one side is clamped between hermetically sealed case end and the clamping individual 41, this clamping individual 41 has been attacked screw thread at 42 places successively, and as shown in the figure with this end engagement of overcoat, another free edge of U-shaped dividing plate then is clamped between retaining member 41 and the interior locking nut 43, and this locking nut is in this end engagement of 44 places and retaining member 41.Dividing plate as shown in the figure defines an internal cavities 45, is marked with a kind of relative incompressible fluid in this cavity.A dividing plate part is supporting fixing or static Sealing 32 side relative with its sealing surface, and this part of dividing plate is being supported by a carriage 46 collaborative stage clips 47.This stage clip is embedded in 48 li of blind holes of retaining member 41 and acts on the carriage 46.Be in the effect that the hydrodynamic pressure in pump case is then being born in the outside of the partition wall section above the static seals 32, hydrodynamic pressure is passed to the fluid of dividing plate inside, and then acts on the partition part adjacent with static seals 32 through carriage 46 successively.Significantly as can be seen, increase or reduction along with the pump case fluid pressure, the dividing plate internal fluid pressure also can increase or reduce pari passu, and then the biasing force that acts on the static seals 32 also can increase or reduce, and this just forces the applying sealing surface of the sealing surface of static seals and rotary seal 31 to be in closely and is sealed and matched.By increasing or reduce the width of the annular surface adjacent, also just increase or reduce with static seals 32.Therefore dividing plate is configured as has a certain width, makes the needs that satisfy biasing force under any specified conditions on the surface at this place.

An Aided Machine black box 49 is arranged within the hermetically sealed case 25, and it has a rotary seal 50, and sealing part 50 is fixed on the axle sleeve 36, and rotates with axle sleeve, and this axle sleeve surrounds rotating shaft.An O shape ring 51 is between Sealing 50 and axle sleeve 36.Fixing or static Sealing 52 then is fixed on the hermetically sealed case, and cooperate with rotary seal 50 bias voltages by a stage clip 53, this stage clip 53 is bearing in 54 li of blind holes, this blind hole 54 is positioned on the flange 55 that radially points to inwards, this flange 55 constitutes the part of hermetically sealed case, this stage clip acts on the static seals 52, and the result just forces this static seals and rotary seal to be in the state of being sealed and matched.Another O shape ring is between flange 55 and static seals 52.Outer by sealing here, axle sleeve and two mechanical sealing assemblies just define a chamber 56, and a kind of cooling liquid such as water, just can enter this chamber by import 57, through circulation in chamber 56, again by the discharge of outlet (not shown).Like this, circulating water is just impacting the

Sealing

31 and 32 in the chamber 56, can be used for removing any dirt, such as the mud from flowing between the sealing surface of confidential paper.In addition, this circulation of fluid can make black box be in dampness, this point is very favourable, because cas fortuit is particularly to unserviced pump, if having lost fluid pumped lubrication effect, pump is in when doing running, will make the sealing surface of Sealing become dry, thereby cause overheated and/or accelerated wear test.Usually cycle rate is approximately per hour 2 to 3 gallons fully.

Claims

1, a kind of mechanical sealing assembly that is used for rotating shaft, this rotating shaft puts in this pressurized container by an opening on the pressurized container wall, described black box comprises static and rotating seal portion, described Sealing has the sealing surface of applying, and be clamped in the hermetically sealed case, described hermetically sealed case is being supported a dividing plate, define a cavity thus, in this cavity, accommodate a kind of relative incompressible fluid, the part of described dividing plate outer surface is being born the effect of hydrodynamic pressure in the described pressurized container, another part of described outer surface is then supporting described static seals, and bearing position is the side relative with the sealing surface of static seals.

2, a kind of in claim 1 desired mechanical sealing assembly, wherein said hermetically sealed case also defines a chamber, fluid circulates through chamber, and on the side of sealing part, contact with the sealing part, this side is meant and the inner facing surfaces of described pressurized container, this circuit fluid is used for washing away the fluid of being come in by described seal leakage, and is used for lubricated described sealing surfaces if necessary.

3, a kind of mechanical sealing assembly that is used for rotating shaft, this rotating shaft has an axial adjustable bearing part, and this rotating shaft is by putting in this pressurized container because of an opening on the pressurizer wall unmatched, described black box comprises static and rotating seal portion, described Sealing has the sealing surface that towel closes, and be clamped in the hermetically sealed case, the sealing overcoat is axially movable with described rotating shaft, and the part of the part of wherein said hermetically sealed case and described bearing part adjacency is to stop this overcoat to move axially to the outside of described pressurized container.

4, a kind of in claim 3 desired mechanical sealing assembly, wherein said hermetically sealed case also defines a chamber, fluid circulates through this chamber, and on the side of sealing part, contact with the sealing part, this side is meant and the inner facing surfaces of described pressurized container, this circuit fluid is used for washing away the fluid of being come in by described seal leakage, and is used for lubricated described sealing surfaces if necessary.

5, a kind of mechanical sealing assembly that is used for rotating shaft, this rotating shaft has an axial adjustable bearing part, and this rotating shaft puts in this pressurized container by an opening on the pressurized container wall, described black box comprises static and rotating seal portion, described Sealing has the sealing surface of applying, and be clamped in one in the axially movable hermetically sealed case of described rotating shaft, described hermetically sealed case is being supported a dividing plate, define a cavity thus, in this cavity, accommodate a kind of relative incompressible fluid, the part of described dividing plate outer surface is being born the effect of hydrodynamic pressure in the described pressurized container, another part of described outer surface is then supporting described static seals, bearing position is the relative side of the sealing surface of static seals, and the part of the part of wherein said hermetically sealed case and described bearing part adjacency is to stop this overcoat to move axially to the outside of described pressurized container.

6, a kind of in claim 5 desired mechanical sealing assembly, wherein said hermetically sealed case also defines a chamber, fluid circulates through this chamber, and on the side of sealing part, contact with the sealing part, this side is meant and the inner facing surfaces of described pressurized container, this circuit fluid is used for washing away the fluid of being come in by described seal leakage, and is used for lubricated described sealing surfaces if necessary.

7, a kind of substantially as the described with reference to the accompanying drawings mechanical sealing assembly in front.

8, a kind of desired any one and mechanical sealing assembly that rotating shaft, bearing part and pressurized container combine in the claim 1 to 7.