CN102192190B

CN102192190B - Improved tight multi-stage pump

Info

Publication number: CN102192190B
Application number: CN201110070224.6A
Authority: CN
Inventors: 朱利亚诺·马泰亚齐; 菲奥伦佐·赞伯兰
Original assignee: Calpeda SpA
Current assignee: Calpeda SpA
Priority date: 2010-03-18
Filing date: 2011-03-16
Publication date: 2014-01-29
Anticipated expiration: 2031-03-16
Also published as: CN102192190A; HK1160908A1; DK2366905T3; EP2366905A3; EP2366905B1; IT1398811B1; EP2366905A2; ITVI20100075A1

Abstract

The invention is a multi-stage pump (1) comprising an external jacket (2) with a suction port (3) and a delivery port (4), provided at one end with a casing cover (5) and at the opposite end with a lantern bracket (6) supporting an electric motor (7) associated with rotary pumping members (8). The casing cover (5) and the lantern bracket (6) are coupled to the ends of the external jacket (2) through fixing means with the interposition of annular gaskets (17). Each gasket is housed in an annular seat (18) defined by a shaped annular area (19) present in the casing cover (5) and the lantern bracket (6) and by a counter-shaped annular area (20) present in the corresponding end of the external jacket (2), opposing each other. The counter-shaped annular area (20) comprises an annular counteracting surface (20a), inclined with respect to the longitudinal axis (Y) defined by the external jacket (2), suited to compress the annular gasket (17) when the casing cover (5) and the lantern bracket (6) are coupled to the external jacket (2) through the tie rods. The external jacket (2) is provided with a plurality of shaped annular portions (28) suited to make the external jacket (2) elastically yielding along the direction defined by its longitudinal axis (Y) and the fixing means comprise a plurality of tie rods (12) each one of which is provided with a first end (12a) constrained to the casing cover (5) and a second end (12b) constrained to the lantern bracket (6).

Description

Improved tight multi-stage pump

Technical field

The present invention relates to improved tight multi-stage pump.

Background technique

In the region that the part of the housing that as everyone knows, pump comprises pumping unit in restriction is conventionally linked together, there is sealing problem.

Sealing problem even occurs in multistage pump, usually occurs in the region that connects with the external jacket of accommodating pumping unit of cover frame of housing lid and supporting motor.

Known patent documentation EP0406787A2, JP57103400U, US5407323A and EP0566089A1, the embodiment of the multistage pump that is provided with ring liner has been described, above-mentioned ring liner is contained in annular seating, and at this, sealing obtains by the inclination annular surface of compression gaskets.

In operation, at the level place of sealing area, external jacket can expand due to the fluid of internal pressure and heating.

Due to this expansion, reduced with liner therefore contact and lose sealing, the aggravation step by step along with the past of time and the use of pump of this situation.

Summary of the invention

The object of the invention is to eliminate or at least alleviate this generally acknowledged shortcoming.

Particularly, the object of the invention is to, compared with prior art, particularly, in multistage pump, externally, in the level of the attachment areas of the end housing lid of sheath and cover frame, improve the situation that liner provides sealing.

Another object of the present invention is to, guarantee that liner bears the pressure that substantially keeps constant when the temperature of pump and change of pressure.

A further object of the present invention is that the At The Height in liner region of living in improves the rigidity of the mechanical coupling of housing lid and cover frame and external jacket.

Above-mentioned purpose reaches by having the multistage pump of characteristic shown in independent claims.

Other details as the pump of theme of the present invention describes in the dependent claims.

Advantageously, in multistage pump of the present invention, obtaining housing lid and covering frame does not need the design of pump to make expensive modification with the sealing connecting of external jacket.

Still advantageously, use the liner identical liner used with prior art, can obtain the sealing of higher degree, thereby improve its stability, and improve its operating conditions.

Accompanying drawing explanation

In the following explanation in this as schematic and the preferred embodiments of the present invention that non-limitative example provides with reference to accompanying drawing, will more specifically give prominence to above-mentioned purpose and advantage, wherein:

Fig. 1 illustrates as the part of the pump of theme of the present invention, longitdinal cross-section diagram;

Fig. 2 illustrates the details of the amplification of Fig. 1;

Fig. 3 illustrates the details of the amplification of Fig. 2;

Fig. 4 illustrates the details of the amplification of Fig. 3;

Fig. 5 illustrates the details of another amplification of Fig. 2;

Fig. 6 illustrates the details of the amplification of Fig. 5.

Embodiment

Shown in Fig. 1, as the multistage pump of theme of the present invention, at this, this multistage pump integral body is expressed as 1.

Can see, this multistage pump comprises the external jacket 2 that is essentially cylindrical shape, mainly extends longitudinally, in this external jacket 2, can limit near suction port 3 and the delivery outlet 4 in an end that is arranged in external jacket, housing lid 5 is applied on this end of external jacket 2.

Externally on the opposite end of sheath, have

cover frame

6,6 supportings of cover frame are by the motor 7 of the assembly of 8 rotations of indicating as a whole and static component, and the arrangement of components of rotation and static component is the inside of sheath 2 externally.

About rotation and the static component assembly 8 comprising in figure, it can be any type.

On the level of through hole 11 that enters into cover frame 6 from axle 10, specific liner 9 guarantees motor 7 be connected to the axle 10 on pumping unit 8 and cover the sealing between frame 6.

Housing lid 5 and cover frame 6 mechanically and removably connect with the respective end 2a of external jacket 2 by fixing device.

The sealing of attachment areas guarantees by inserting ring liner 17, ring liner 17 preferably but not necessarily by open market, can buy and form for the elastic ring of known O shape ring.

As accompanying drawing 4 illustrates in greater detail to 6, described in each, liner 17 is contained in annular seating 18, annular seating 18 is limited with relative moulding annular region 20 by moulding annular region 19 respect to one another, moulding annular region 19 is present in housing lid 5 and cover frame 6, and moulding annular region 20 is present in the respective end of external jacket 2 relatively.

Can see, moulding annular region 20 comprises annular reaction surface 20a relatively, annular reaction surface 20a tilts with respect to the longitudinal axis Y being limited by external jacket 2, and is suitable for compressing ring liner 17 when housing lid 5 is connected on external jacket 2 with cover frame 6.

Particularly, can see, the moulding annular region 19 being present in housing lid 5 belongs to lamination element 21, when housing lid 5 is connected on external jacket 2, and the surface of the inside of the sheath towards the outside 2 of lamination element 21 covering shell lids 5.

Similarly, can see, the moulding annular region 19 being present in cover frame 6 belongs to lamination element 22, when cover frame 6 is connected on described external jacket 2, and the surface of the inside of the sheath towards the outside 2 of lamination element 22 cover framves 6.

Finally, when assembling is during pump, each relative moulding annular region 20 be arranged in each corresponding moulding annular region 19 before, and externally the level place of each the end 2a in the main body of sheath 2 obtains.

Stop collar shape seat 18 when housing lid 5 is connected on external jacket 2 with cover frame 6, the cross section of the annular seating 18 obtaining according to the plane of the longitudinal axis Y through being limited by external jacket 2 is right-angled trapezium substantially, and the hypotenuse of right-angled trapezium is corresponding to annular reaction surface 20a.

Particularly, when fixing device is with active force during with respect to the end 2a of external jacket 2,2b rugged housing lid 5 and cover frame 6, annular surface 20a reacts on liner 17, and above-mentioned active force produces:

-with respect to the axial thrust load of the bottom 18a pushing liner 17 of annular seating 18, and

-be tending towards inflated insert 17 to make the radial component on its wall 18b that is attached to annular seating 18, that is, and with respect to limiting the moulding annular region 19 of annular seating 18 and the sidewall of relative moulding annular region 20.

The degree of sealing is determined by the fastening degree of fixing device.

According to the present invention, as the fixing device being shown specifically in Fig. 2 and 3, comprise a plurality of pull bars 12, wherein, each pull bar 12 has the first thread head 12a and the second thread head 12b, the first thread head 12a precession is present in the tapped hole 14 in housing lid 5, and the second thread head 12b is limited in the through hole being formed in cover frame 6 by nut 16.

Nut 16 is surperficial fastening by pull bar 12 tensionings with respect to cover frame 6, and guarantees that housing lid 5 and cover frame 6 are stably connected on the end of external jacket 2.

According to the present invention, external jacket 2 has a plurality of moulding ring parts 28 again, and moulding ring part 28 is suitable for making the external jacket 2 direction elastic buckling that longitudinally axis Y limits.

Particularly, moulding ring part 28 has the convex side of the inside of sheath 2 towards the outside, moulding ring part 28 according to layout parallel to each other and with the longitudinal axis intercross arrangement of external jacket 2, for make external jacket 2 elastic bucklings when external jacket 2 is subject to axial load.

Therefore, the end 2a that fastening pull rod 12 is fixed to external jacket 2 by housing lid 5 and cover frame 6 is upper, makes external jacket 2 by axial push, and the characteristic of therefore simulating spring preloads.

Operation period, the any extension causing due to the increase of pressure or the raising of temperature is absorbed owing to preloading the elastic recovery causing, this allows to keep constant with respect to the thrust of liner 17, wherein, when fastening assembling the by adjustment pull bar, by above-mentioned preloading, gives external jacket.

Like this, realize the first object, that is, by increasing the adhesive force with respect to the wall of the annular seating 18 that comprises liner 17, improved the object of the sealing of liner 17.

In addition, the present invention guarantees the compressive force substantial constant that liner 17 bears and the object that not affected by pump temperature and working pressure by suitably adjusting the fastening degree of pull bar 12, also reaching.

Also by improving housing lid 5, improve sealing with the mechanical stiffness that cover frame 6 is connected on external jacket 2.

In fact, can from Fig. 4 and 6, at length see, housing lid 5 and cover frame 6 are provided with circular groove 25, when pull bar 12 is mechanically connected on external jacket 2 by housing lid 5 with cover frame 6, and the periphery of the respective end 2a of the accommodating external jacket 2 of circular groove 25.

Like this, each end 2a of external jacket 2 keeps being limited in its accommodating circular groove 25, has substantially eliminated any radial motion that may appear at the external jacket in this region due to heat or pressure.

This has improved the stability of liner significantly, and also affects energetically it through the sealing of certain hour.

According to the preferred embodiments of the present invention described herein, in the moulding ring part of the external jacket 2 forming according to the plane through longitudinal axis Y, the cross section of each, is isosceles-trapezium-shaped haply.

Yet significantly, described forming part can have section and shape arbitrarily, for example circular arc or other shape, and the convex side of forming part inside or the outside of sheath 2 towards the outside.

About suction port 3 and delivery outlet 4, can see having by

weld seam

31,41 and be directly connected to the

sleeve

30 and 40 on external jacket 2 in its level separately,

weld seam

31 and 41 utilizes a realization in known automatic or manual welding system.

Described

sleeve

30,40 is applied directly on external jacket 2 by being welded to connect, and has simplified pump structure and has reduced cost.

Significantly, each

sleeve

30,40 can be provided with for

example flange

32,42, to pump 1 is connected on unshowned external straw and output tube,

flange

32,42 is suitable for relative flange accommodating and its connection, not shown.

Selectively,

sleeve

30,40 can be connected in exterior tube by screw thread or other known connected system.

Based on the above, very clear, as the multistage pump of theme of the present invention, realized all predetermined objects.

Particularly, illustrate, by confirming the liner sealing of the improvement after after a while in conjunction with following steps:

-by moulding ring part 28, make external jacket 2 there is axial elasticity;

-use pull bar 12, can adjust the power of axially fastening.

In addition, by strengthening the end 2a and the mechanical connection that housing lid 5 and cover frame 6 connect of external jacket 2, obtain other improvement, particularly about liner stability.

Significantly, at construction phase, pump of the present invention may stand modifications and variations, and above-mentioned modifications and variations can comprise for example different sections of the annular seating of accommodating liner, even has the annular seating of different quantity.

In addition, as mentioned above, the form of the moulding ring part externally obtaining on sheath and quantity can be different from said and shown in form and quantity.

Finally, each end that also can change external jacket 2 is mechanically connected to the mode on corresponding housing lid 5 and corresponding cover frame 6, make its be different from said and shown in operation.

All variant embodiments described herein, and also unshowned other embodiment of the not description that should be applied to pump of the present invention, as long as within it falls into the scope of claims, must think and be protected by this patent so.

The technical characteristics place mentioning in arbitrary claim is all with reference mark; the object that comprises these reference marks is only the intelligibility that increases claim; therefore, these reference marks to the protection of each element being indicated by way of example by these reference marks without any restriction.

Claims

1. a multistage pump (1), comprise the external jacket (2) that is essentially tubulose, described external jacket (2) mainly extends in the vertical, and there is at least one suction port (3) and at least one delivery outlet (4), described external jacket (2) is provided with housing lid (5) at one end, and be provided with cover frame (6) at place, opposite end, described cover frame (6) supports the motor (7) that the rotation pumping member (8) inner with being arranged in described external jacket (2) is associated, described housing lid (5) and described cover frame (6) mechanically and are removably connected on the end of described external jacket (2) by being inserted with the fixing device of ring liner (17), each of described ring liner (17) is all contained in annular seating (18), described annular seating (18) is limited by the relative moulding annular region (20) that is present in the moulding annular region (19) in described housing lid (5) and described cover frame (6) and be present in the corresponding end of described external jacket (2), described moulding annular region (19) and described relative moulding annular region (20) are toward each other, described relative moulding annular region (20) comprises annular reaction surface (20a), described annular reaction surface (20a) tilts with respect to the longitudinal axis (Y) being limited by described external jacket (2), when described housing lid (5) and described cover frame (6) were connected to described external jacket (2) when upper by described fixing device, described annular reaction surface (20a) is suitable for compressing described ring liner (17), it is characterized in that, described external jacket (2) is provided with a plurality of moulding ring parts (28), described moulding ring part (28) is suitable for making described external jacket (2) flexibly to surrender along the direction being limited by described longitudinal axis (Y), and, described fixing device comprises a plurality of pull bars (12), pull bar described in each (12) has the first end (12a) being limited in described housing lid (5) and is limited in the second end (12b) on described cover frame (6).

2. multistage pump according to claim 1 (1), it is characterized in that, described housing lid (5) and described cover frame (6) are provided with circular groove (25), when described fixing device was mechanically connected to described external jacket (2) when upper by described housing lid (5) and described cover frame (6), the periphery of the corresponding end (2a) of the accommodating described external jacket of described circular groove (25) (2).

3. according to multistage pump in any one of the preceding claims wherein (1), it is characterized in that, in the main body of described external jacket (2), form the described relative moulding annular region (20) in each end that is present in described external jacket (2).

4. according to the multistage pump (1) described in aforementioned claim 1 or 2, it is characterized in that, the described moulding annular region (19) being present in described housing lid (5) belongs to lamination element (21), when described housing lid (5) is connected on described external jacket (2), described lamination element (21) covers the surface of the inside towards described external jacket (2) of described housing lid.

5. according to the multistage pump (1) described in aforementioned claim 1 or 2, it is characterized in that, the described moulding annular region (19) being present in described cover frame (6) belongs to lamination element (22), when described cover frame (6) is connected on described external jacket (2), described lamination element (22) covers the surface of the inside towards described external jacket (2) of described cover frame (6).

6. according to the multistage pump (1) described in aforementioned claim 1 or 2, it is characterized in that, the cross section of the described annular seating (18) forming according to the plane of the longitudinal axis (Y) through being limited by described external jacket (2) is essentially the shape of right-angled trapezium.

7. according to the multistage pump (1) described in aforementioned claim 1 or 2, it is characterized in that, each of described suction port (3) and described delivery outlet (4) is provided with sleeve (30,40), and described sleeve (30,40) is directly connected on described external jacket (2) by least one weld seam (31,41).

8. according to the multistage pump (1) described in aforementioned claim 1 or 2, it is characterized in that, the cross section of each of the described moulding ring part (28) forming according to the plane of the longitudinal axis (Y) through being limited by described external jacket (2) is trapezoidal shape, and described trapezoidal convex side is towards the inside of described external jacket (2).

9. according to the multistage pump (1) described in aforementioned claim 1 or 2, it is characterized in that, in each of described pull bar (12), described first end (12a) is threaded, and be limited in being present in the tapped hole (14) in described housing lid (5), described the second end (12b) is threaded, and is limited in the through hole being formed in described cover frame (6) by nut (16).