CN101220817B

CN101220817B - Centrifugal pump having an inner casing and an outer casing

Info

Publication number: CN101220817B
Application number: CN200710182198XA
Authority: CN
Inventors: W·C·德龙德; C·A·范德内特; H·H·布达伊哲
Original assignee: IHC Holland lE BV
Current assignee: IHC Holland lE BV
Priority date: 2006-09-19
Filing date: 2007-09-19
Publication date: 2012-07-04
Anticipated expiration: 2027-09-19
Also published as: EP1906029A1; EP1906029B1; CN101220817A; ATE452295T1; DE602006011162D1

Abstract

A centrifugal pump comprises an inner casing and an outer casing surrounding the inner casing in a fluid tight way. The outer casing has an inlet at an axial end and a tangentially oriented outlet at its circumference. The outer casing comprises at least two outer casing parts which can be joined to each other in a fluid tight way along a joining face. The joining face extends along at least two planes that are oriented at an angle with respect to each other. The joining face runs continuously outside of the tangentially oriented outlet at the circumference of the outer casing.

Description

Centrifugal pump and application thereof with inner housing and frame

Technical field

The present invention relates to a kind of centrifugal pump; It comprises inner housing, surrounds the frame of this inner housing with fluid sealing mode; Said frame has the import that is positioned at the axial end portion place and is positioned at the outlet of its location, peripheral tangential, and said frame comprises at least two frame spares that are connected with each other with fluid sealing mode along the mating face.

Background technique

This centrifugal pump is known.This centrifugal pump has the impeller that is rotatably mounted in the inner housing, and is connected to the axle on the impeller.This axle extends frame, and can be by motor driven.Inner housing comprises the mass flowing nozzle of location, tangential.This mass flowing nozzle is contained in the corresponding outlet of frame.

The frame of this centrifugal pump comprises two outside half housings, that is, these two frame spares form the cup shell of two symmetries.Each of these outside half housings all has the end face that is provided with flange, and said flange is bolted in together in a fluid tight manner.Medially extend between them on the mating face of clamped outside half housing.Owing to adopt this structure, the load that puts on the frame can be disperseed effectively.

Yet the mating face between two housings spare also with the outlet of frame in two.The outlet of frame also comprises the outlet(discharge) flange that is positioned at its end, this flange be used for the flange bolt of discharge pipe together.Then, being connected between the clamping flange of the central engagement face between two outside half housings and outlet and discharge pipe contacts.In this position, exist higher relatively spillage risk.If the flange of two outside half housings and/or outlet and discharge pipe not accurately vertical engagement to together so little slit will appear, this externally the fluid-tight connection between housing member and the discharge pipe work the mischief.

Summary of the invention

The purpose of this invention is to provide a kind of centrifugal pump, wherein will reduce the danger of leaking.

According to the present invention, this purpose will realize like this that said mating face is relative to each other extended with the plane of an angular positioning along at least two, and extend in the outside of the outlet of location, tangential at the frame periphery continuously on said mating face.

According to the present invention, the sidepiece of the outlet that locate along the tangential around frame on the mating face extends continuously, that is, does not intersect with outlet on the mating face.In other words, the outlet that is positioned at the location of locating around the frame, tangential is set at a housing member as one.A housing member is provided with the outlet of one.Thus, limiting the outlet(discharge) flange that exports can be uninterrupted.Then, just might be bolted to together with outlet(discharge) flange securely with a kind of mode of anti-leak flange with discharge pipe.

It should be noted that this centrifugal pump is known, it comprises frame that is provided with cup-shaped frame spare and the cover plate that is used to seal this frame spare.Frame spare has so big size, so that it can hold the inner housing of centrifugal pump fully.This frame spare comprises the flange that is positioned at the side place, and this flange and cover plate bolt are together.The outlet of frame is extended the danger that this will reduce to leak in the housing member fully outside then.Yet put down on the mating face between frame spare and cover plate, and promptly it is not in being oriented relative to one another at least two planes of an angular positioning, to extend.Like this, cover plate is done on the as a whole sidepiece that is positioned at frame, thereby the intensity distriubtion of frame is inhomogeneous.Thus, need strengthen, so just increase manufacture cost frame.

According to the present invention, preferably, the mating face comprises core, and it is consistent with the central plane of frame basically.Frame has at axially extended width.When frame spare joins a time-out to, the width of frame is limited the distance between the outer side surface of frame spare.In this embodiment of the present invention, the mating face is partly along half extension of this width.Thus, the intensity of frame will distribute with mode preferably.

In an embodiment of the present invention, the mating face between the two frame spares comprises the sidepiece that the outlet of adjacent housings body is extended.The sidepiece on this mating face extends along sides of outer shell at least in part, thereby the outlet of frame is surrounded, and the flange of outlet can be integrally formed like this.

According to the present invention, feasible is that the sidepiece on mating face is roughly parallel to central part and extends.In this case, sidepiece is all parallel with the central plane of frame with central part.

According to the present invention, the mating face can be included in the joint that extends between middle part, mating face and the sidepiece.The middle part on mating face and sidepiece are connected with each other through this joint.Joint tilts with respect to the central plane of frame.

In this case, the mating face is formed by three partial surface, i.e. middle part, joint and sidepiece.The middle part on mating face roughly is positioned at the central plane of frame, and promptly frame spare has equal widths on the both sides, middle part.The sidepiece on mating face extends in a certain side, and said side and central plane have a segment distance, thereby sidepiece does not intersect with the outlet of frame.The plane of sidepiece can tilt with respect to central plane.The joint on mating face extends in the plane at angle, plane with respect to middle part and sidepiece.Joint links together middle part and sidepiece.

Certainly, the mating face can be constructed in a different manner.For example, the mating face can be included in the joint that two Different Plane are extended, and wherein said plane relative to each other tilts.Equally, also separate on these planes, and promptly joint has formed two joints.This depends on, for example, and the position of outlet.

In order to increase the rigidity of two housing members with respect to inner excessive pressure, two frame spares can roughly form cup-shaped.In this case, they can have flange in the end, and said flange is connected with each other in a fluid tight manner.It should be noted that housing member can also be connected with each other with various alternate manners in a fluid tight manner.For example, housing member can be clamped at each other together or be engaged.

In addition, in centrifugal pump according to the present invention, this pump comprises and is rotatably installed in the impeller in the inner housing and is connected to the axle on the impeller that said extends to outside the frame at its axial end place opposite with import.Then, frame comprises shaft-cup, and axle extends through this shaft-cup in a fluid tight manner.Also possible is, frame comprises access cover, and the import pipe fitting extends through this access cover.

Description of drawings

Described embodiment further explains the present invention referring now to accompanying drawing.

Fig. 1 shows the plan view according to centrifugal pump of the present invention;

Fig. 2 shows the side view of the pump among Fig. 1;

Fig. 3 shows the front elevation of the pump among Fig. 1.

Embodiment

Centrifugal pump shown in Fig. 1-3 comprises housing 1, and this housing is made up of inner housing 2 and frame 3.Inner housing 2 is installed in the frame 3, promptly does as a wholely, and frame 3 surrounds inner housing 2.Inner housing 2 is usually by hard, wear-resisting material, and for example Hardened Steel or cast iron form.Material through this centrifugal pump is carried for example through the material that excavates or mining processes obtains, possibly comprise the composition that abrasiveness is strong.This material can produce the block material of impact force when in addition, possibly be included in through inner housing 2 conveyings.In addition, when carrying out excavation or mining processes, in the inner housing 2 pressure surge possibly appear.Therefore, centrifugal pump, particularly wearing and tearing appear in inner housing 2 easily.

With regard to hard material, the friability of Hardened Steel or cast iron for example, these materials extremely are not fit to power of withstanding shocks or pressure surge.Especially, said material resistance to compression well (yield) therefore is inappropriate for and bears this load.This may cause breaking in the inner housing 2.Yet this is breakneck, and this is because the size of pump causes with the quite high pressure that results from it.Taking place under the situation of breaking, fragment and the material that just is being pumped may be gone out through perisporium, and this will cause very big danger to personnel and environment.

Frame 3 is used to reduce this danger.Frame 3 is designed to comprise any material that possibly go out in the inner housing 2 that breaks.So frame 3 comprises the material that is suitable for very much withstanding shocks with analogue.Therefore, the material of frame 3 preferably includes hard and withstand voltage material, and this material also is suitable for keeping the overvoltage in the frame 3.Frame 3 for example can be made of plastics.

The inner housing 2 of centrifugal pump forms spiral case.Inner housing 2 has import 20 at the axial end place, has the outlet 21 of tangential at its periphery.Outlet 21 forms nozzle or jet pipe.Inner housing 2 comprises and is installed on the impeller 4 of axle on 5, and said axle 5 rotatably is supported with respect to framework 7 through bearing means 6.Therefore, impeller 4 can rotate in inner housing 2.

In the side facing to bearing means 6, frame 3 comprises shaft-cup 10, and this shaft-cup 10 seals with respect to axle 5 through known sealing at present.Shaft-cup is commonly referred to as hydroecium.At the end opposite place, can connect the inlet tube (not shown), this also is known.

The frame 3 of centrifugal pump has import 22 and has tangential outlet 23 at its periphery at the axial end place.Advancing of import 22 and inner housing 2 20 aimed at, and exports 23 consistent with the outlet nozzle 21 of inner housing 2 simultaneously.

Because when the interior pressures in the inner housing 2 for example can rise to 40atm, inner housing was supported from the outside through being exerted pressure in the inner space of frame 3.Therefore, frame 3 comprises pressure link 13, through this pressure link, can keep the overvoltage of 80% in the inner housing for example 2.

Clearly show that among Fig. 1 and Fig. 2 that frame 3 is made up of two frame spares 14,15.

Housing member

14,15 all is and has the cup-shaped of edge part 18.Edge part 18 provides certain intrinsic hardness for housing member 14,15.Frame spare 14 has flange 16, and frame spare 15 is provided with corresponding flange 17 simultaneously.These

flanges

16,17 for example can be bonded together through the mode of bolt with anti-leak.

Flange

16,17 defines the mating face of frame spare 14,15.Frame spare 14,15 and their

flange

16,17 are designed to, and this mating face is along at least two intersecting plane extensions of angled location each other.In other words, does not put down on frame spare 14, the mating face between 15---and it comprises at least one complications.The cup-shaped frame spare 14,15 of frame 3 is asymmetric shape with respect to the central plane A of frame 3.

The mating face that the frame spare of this exemplary embodiment is 14,15 comprises consistent with the central plane A of frame 3 basically middle part 25, and promptly middle part 25 is positioned at half place of the width W of frame 3.Thus, this mating face is at least in part with respect to the central plane symmetry.This rigidity for frame 3 is useful.

The mating face also comprises the sidepiece 27 that 23 extensions of adjacent housings body 3.In this exemplary embodiment, sidepiece 27 tilts with respect to vertical direction.At the top of frame 3, contiguous outlet 23 places, the last connecting line of sidepiece 27 basically with middle part 25 parallel (referring to accompanying drawing 1).From here, sidepiece 27 has formed the rake that extend inside subordinate side.Then, sidepiece 27 continues to extend to 25 places (referring to accompanying drawing 3), middle part.

Because the mating face is the outlet side extending along frame 3 at sidepiece 27 places, so the outlet 23 of frame 3 is only only extended in the housing member 14 outside.Thereby the flange 16 of frame spare 14 also extends around the outlet 23 of frame 3 serially.Like this, the flange 16 of the outlet of qualification frame 3 does not interrupt.This just makes has realized that with the outer pipe (not shown) reliable anti-leak is connected.

The mating face also has the joint 26 (referring to accompanying drawing 1) that between the middle part 25 on mating face and sidepiece 27, extends.Joint 26 tilts with respect to the central plane of frame 3.

Since frame spare 14, the mating face between 15 be designed to be positioned at frame 3 outlet 23 around; Simultaneously a part of mating face remains in the central plane of frame 3, so frame 3 has realized being connected with the mode of anti-leak with outer pipe and having enough rigidity.

The present invention is not limited to exemplary embodiment shown in the drawings.Those skilled in the art can this centrifugal pump of modified in various manners according to the present invention.

Claims

1. centrifugal pump; It comprises inner housing (2), is centered around inner housing (2) frame (3) on every side in a fluid tight manner, and said frame (3) has import (22) that is positioned at the axial end place and the outlet (23) of locating in its peripheral tangential, and said frame (3) comprises two frame spares (14; 15); Said two frame spares (14,15) are engaged with each other along the mating face in a fluid tight manner, it is characterized in that the plane extension of said mating face along at least two location that have a certain degree each other; And extend in the outside of the outlet (23) of location, tangential at frame (3) periphery continuously on said mating face.

2. centrifugal pump as claimed in claim 1, wherein the mating face comprises consistent with the central plane of frame (3) basically middle part (25).

3. centrifugal pump as claimed in claim 1, wherein the mating face comprises the sidepiece (27) that the outlet (23) of adjacent housings body (3) is extended.

4. centrifugal pump as claimed in claim 2, wherein the mating face comprises the sidepiece (27) that the outlet (23) of adjacent housings body (3) is extended.

5. centrifugal pump as claimed in claim 4, wherein the sidepiece on mating face (27) is arranged essentially parallel to middle part (25) extension.

6. centrifugal pump as claimed in claim 4, wherein the mating face comprises the joint (26) that extends between at least one middle part on the mating face (25) and the sidepiece (27).

7. according to claim 1 or claim 2 centrifugal pump, wherein two frame spares (14,15) are roughly cup-shaped, and have flange (16,17) in the end, and said flange (16,17) is connected with each other in a fluid tight manner.

8. according to claim 1 or claim 2 centrifugal pump wherein, is provided for keeping the link (13) of the overvoltage in the frame (3).

9. according to claim 1 or claim 2 centrifugal pump, wherein pump comprises the impeller (4) that is rotatably installed in the inner housing (2), and the axle (5) that is connected to this impeller (4), said (5) extend to outside the frame (3) at its axial end place opposite with import (22).

10. centrifugal pump as claimed in claim 9, wherein frame (3) comprises shaft-cup (10), its axis (5) extends through said shaft-cup (10) in a fluid tight manner.

11. the application of the described centrifugal pump of aforementioned each claim.