CN1989347A - Centrifugal pump - Google Patents
Centrifugal pump Download PDFInfo
- Publication number
- CN1989347A CN1989347A CNA2004800436049A CN200480043604A CN1989347A CN 1989347 A CN1989347 A CN 1989347A CN A2004800436049 A CNA2004800436049 A CN A2004800436049A CN 200480043604 A CN200480043604 A CN 200480043604A CN 1989347 A CN1989347 A CN 1989347A
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- CN
- China
- Prior art keywords
- centrifugal pump
- main shaft
- urceolus
- impeller
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
- F04D29/4286—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps inside lining, e.g. rubber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
- F04D1/063—Multi-stage pumps of the vertically split casing type
- F04D1/066—Multi-stage pumps of the vertically split casing type the casing consisting of a plurality of annuli bolted together
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/026—Selection of particular materials especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/06—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being hot or corrosive, e.g. liquid metals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/20—Manufacture essentially without removing material
- F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
- F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding
- F05D2230/234—Laser welding
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/95—Preventing corrosion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
- F05D2300/17—Alloys
- F05D2300/171—Steel alloys
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A centrifugal pump includes at least one impeller (11) fixed to a main shaft (10) and at least one casing which houses the impeller and is formed through press working of sheet metal such as a steel plate. The centrifugal pump further includes a casing cover configured to seal an open end of the casing hermetically, and a shaft seal device (12) provided at a portion where the main shaft passes through the casing cover. The casing cover has a thick member (6) made of castings, and a thin corrosion-resistant lining member (40) which is tightly fixed to the thick member.
Description
Technical field
The present invention relates to centrifugal pump, more specifically relate to a kind of centrifugal pump, it has at least one and is fixed on impeller and at least one housing on the main shaft, and housing has held impeller and the compacting work (press forming) by for example thin sheet of metal as the steel plate forms.
Background technique
As a kind of centrifugal pump, known have a kind of multistage pump, comprises a plurality of impellers that are fixed in main shaft, and main shaft is connected in the prime mover as the motor, and is used to hold a plurality of interstage casings of piling up of impeller separately.
Fig. 9 is a vertical section figure, shows an example of disclosed traditional vertical-type multistage pump in Japan publication publication number 2003-214383.As shown in Figure 9, traditional vertical-type multistage pump comprises the interstage casings 101 of a plurality of vertical stackings, they form by the press process of steel plate, a upper shell 102 is positioned on the uppermost interstage casings 101, a lower shell body 103 is positioned at nethermost interstage casings 101 belows, and the interstage casings 101 and the upper shell 102 and frame 104 that link to each other with lower shell body 103 that have held vertical stacking.Housing lid 105 is positioned at the upper open end of upper shell 102 and frame 104, is used to seal upper shell 102 and frame 104.
A plurality of impellers 111 are fixed on the main shaft 110, and each impeller 111 is contained in each interstage casings 101, and mechanical seal 112 is installed to the top of main shaft 110, with the shaft sealing that realizes that main shaft 110 passes the part place of housing lid 105.The motor base 106 that is used for the support motor (not shown) is positioned at housing lid 105.
Then, will the operation of multistage pump shown in Figure 9 be described briefly.
When multistage pump is operated, from the suction part 103a of lower shell body 103 suction liquid be introduced in the first order impeller 111 by lower shell body 103, and by first order impeller 111 pressurizations by main shaft 110 rotations.The liquid of pressurization is introduced into next stage impeller 111 then by by returning the passage that blade 134 limits.In this manner, impeller 111 pressurizations of liquid by in each interstage casings 101, and at liquid by pressure head recovery by liquid when returning the passage that blade 134 limits.After this, liquid passes through the annular pass 155 of qualification between frame 104 and the multistage interstage casings 101 then by upper shell 102, and is discharged into the outside of pump then from the floss hole 103b of lower shell body 103.
In traditional multistage pump shown in Figure 9, housing lid 105 sealings that the upper open end of upper shell 102 and frame 104 forms by the press process by corrosion resistant plate.Yet because the high fluid pressure that is produced by multi-stage impeller puts on housing lid 105, housing lid 105 need have high relatively rigidity.Therefore, must use than multistage interstage casings 101 thick corrosion resistant plates for housing lid 105 and to come press process, so the unusual difficulty of the press process of housing lid 105, and the cost of material height of housing lid 105.
And the part place of passing housing lid 105 at main shaft 110 has mechanical seal 112.When mechanical seal 112 usefulness new change the time, mechanical seal 112 need be changed under the state that multi-stage impeller 111 and multistage interstage casings 101 remove from pump.Therefore, more changing jobs of mechanical seal 112 is complicated and trouble.
And interstage casings 101 is the form of hydrostatic column substantially, and the bottom 101a of interstage casings 101 forms flat shape.Therefore, the bottom 101a of interstage casings 101 goes up distortion at the axial direction (downwards) of interstage casings easily.
Summary of the invention
The present invention is directed to defective above-mentioned and design.Therefore, an object of the present invention is to provide a kind of centrifugal pump, it not only can strengthen and has the housing lid function with the rigidity with the element of the sealing open of upper shell and frame, and reduced the cost of material of this element, the replacing that can make things convenient for mechanical seal to be improving maintenance efficiency, and can increase the crushing resistance of the bottom of interstage casings.
In order to realize top purpose, according to a first aspect of the invention, provide a kind of centrifugal pump, comprising: at least one impeller, described impeller are fixed on the main shaft that links to each other with a prime mover; At least one housing is in order to corresponding with described impeller; Housing lid, it is configured for sealing the opening end of described housing; And shaft sealer, it is positioned at the part place that described main shaft passes described housing lid; Wherein, described housing lid comprises thick that is made by foundry goods, and securely is fixed to the thin inner piece against corrosion on described thick.
According to the present invention, comprise thick that makes by foundry goods owing to be used for closely covering the described housing lid of the opening end of described pump case, and make by press element and attached to the thin inner piece against corrosion on thick the outer surface, the corrosion stability of housing lid and rigidity can both guarantee, and the press process of thin inner piece can easily be carried out.And because inner piece comprises thin-wall part, the cost of material of inner piece can reduce.
Of the present invention one preferred aspect in, described inner piece can comprise a press forming spare.
Of the present invention one preferred aspect in, described inner piece can securely be fixed to by press fit on described thick.
Of the present invention one preferred aspect in, described thick can have the hollow circuit cylinder part that allows described main shaft to pass, and described inner piece can have annular portion, it is coupled on the described hollow circuit cylinder part.
Of the present invention one preferred aspect in, can radially outward expanding in an end of the described annular portion of described inner piece, makes described inner piece not separate with described thick.
Of the present invention one preferred aspect in, can expand with the taper radially outward in the end of the described annular portion of described inner piece, make that the described end of the described annular portion of described inner piece guided described packing ring when packing ring when described shaft sealer inserted the described annular portion of described inner piece.
Of the present invention one preferred aspect in, described thick of described housing lid can have an opening, atmospheric side and hydraulic fluid side communicate with each other by described opening, and a pipe against corrosion can be assembled in the opening, and described pipe and described inner piece against corrosion can be by being weldingly connected.
Of the present invention one preferred aspect in, described welding can be a laser bonding.
Of the present invention one preferred aspect in, centrifugal pump may further include a urceolus, be used to prevent that the pressured fluid that is produced by the operation of pump from leaking into the pump outside, described urceolus has at least one shaped portion, is used in the one or both ends of described urceolus O shape circle being installed.
Of the present invention one preferred aspect in, can radially outward expanding in an end of the described shaped portion of described urceolus, comes off to prevent O shape circle.
Of the present invention one preferred aspect in, the tapering part that radially outward expands can be formed on the element that described urceolus is attached thereto, so that the insertion of the described O shape circle that is kept by described urceolus.
In order to realize top purpose, according to a second aspect of the invention, provide a kind of centrifugal pump, comprising: at least one impeller, described impeller are fixed on the main shaft that links to each other with a prime mover; At least one housing is in order to corresponding with described impeller; Described centrifugal pump comprises multistage pump; Described housing comprises a plurality of interstage casings of piling up of having held a plurality of impellers respectively; Described interstage casings comprises first column part, keep with the axial end contact of housing between adjacent level first bottom, from axially extended second column part in described first bottom and second bottom that extends radially inwardly from described second column part; And the curved shape of hemisphere or cardinal principle hemisphere is formed on described second bottom of described interstage casings.
According to the present invention, a plurality of interstage casings of piling up of having held a plurality of impellers are the form with hydrostatic column of a bottom substantially, and the curved shape of hemisphere or cardinal principle hemisphere is formed on the described bottom of each interstage casings, and therefore described interstage casings has high crushing resistance.Therefore, can construct the best interstage casings that to hold highly pressurised liquid.
Of the present invention one preferred aspect in, an intake panel can link to each other with described second bottom of described interstage casings, makes the excircle end face of described intake panel keep the internal surface contact with first column part of housing between adjacent level; And the internal surface of described first column part of described intake panel, described second column part, described first bottom and adjacent interstage casings can form the space that holds O shape circle.
Of the present invention one preferred aspect in, return guide vane can insert between described intake panel and the side plate.
Of the present invention one preferred aspect in, can have a baffle plate in the described interstage casings, so that cover at least one shaped portion of the corner between described first column part and described second bottom.
Of the present invention one preferred aspect in, described baffle plate can have a plurality of recesses in its inner radial.
Of the present invention one preferred aspect in, the maximum diameter of described recess can be less than the external diameter of described impeller.
In order to realize top purpose, according to a third aspect of the invention we, provide a kind of centrifugal pump, comprising: at least one impeller, described impeller are fixed on the main shaft that links to each other with a prime mover; At least one housing is in order to corresponding with described impeller; Be configured for sealing the housing lid of the opening end of described housing; And be positioned at the mechanical seal that described main shaft passes the part place of described housing lid; Wherein, described mechanical seal comprises the axle sleeve that has kept rotating seal ring and be fixed in described main shaft, and the retainer that is configured to keep the standstill seal ring, described retainer comprises column, it has kept being used to seal the Sealing of the liquid between described housing lid and the described column, and a disc; And wherein, described column and described disc are joined together to form described retainer.
According to the present invention, because described mechanical seal comprises cartridge type mechanical seal (Cartridgemechanical seal), only by removing motor and the joiner that is fixed in motor base, described cartridge type mechanical seal just can be installed on the described main shaft or from described main shaft from the position of described main shaft top and remove.Therefore, in order to change described mechanical seal, needn't remove described multistage interstage casings, described multi-stage impeller and like.
According to the present invention, because kept the described retainer of described stationary components (comprising the standstill seal ring) of mechanical seal to comprise described column and the described disc that links together, described column can form by processing a pipe a little, and described disc can easily form by stamping-out or similar approach.Therefore, the described retainer with a bead can be made by minimized course of working, and therefore manufacture cost can greatly reduce.
Of the present invention one preferred aspect in, described disc can comprise the flat board of being made by metal sheet.
Of the present invention one preferred aspect in, described column and described disc can pass through laser bonding.
Of the present invention one preferred aspect in, a gap of being longer than the whole length of described mechanical seal can form between the main shaft of the described main shaft of described pump and described prime mover, and the joiner of the described main shaft of the described main shaft that described mechanical seal can be by will having connected described pump and described prime mover removes and removes by described gap.
In order to realize top purpose, according to a forth aspect of the invention, provide a kind of centrifugal pump, comprising: at least one impeller, described impeller are fixed on the main shaft that links to each other with a prime mover; At least one housing is in order to corresponding with described impeller; Be configured for sealing the housing lid of the opening end of described housing; Be positioned at the mechanical seal that described main shaft passes the part place of described housing lid; Wherein, described mechanical seal comprises the axle sleeve that has kept rotating seal ring and be fixed in described main shaft, and the retainer that is configured for keeping the standstill seal ring, described retainer comprises column, it has kept being used to seal the Sealing of the liquid between described housing lid and the described column, and a disc; And wherein, positioning piece is connected in described main shaft, and the described axle sleeve of described mechanical seal keeps locating described mechanical seal by this with described locating piece contact.
According to the present invention, when being installed on the described main shaft of described pump when described mechanical seal, the described end of described mechanical seal begins with the described locating piece contact of being fixed in described main shaft.Therefore, described mechanical seal can be arranged on the exact position with respect to described main shaft.Therefore, described standstill seal ring and described rotating seal ring remain on the optimum position.
Of the present invention one preferred aspect in, described retainer can have similar step part, is used to keep described standstill seal ring.
In order to realize top purpose, according to a fifth aspect of the invention, a kind of centrifugal pump is provided, comprise: at least one impeller, on the main shaft that described impeller is fixed to a prime mover links to each other, described main shaft has a plurality of grooves at its external peripheral surface, is used to allow described impeller assembling and allows to prevent that described impeller is with respect to described main axis rotation; At least one housing is in order to corresponding with described impeller; Positioning piece is used for locating described impeller with respect to the axial direction of described main shaft; And a holder, it has the integrated disc portions with the end face contact of described locating piece, and from the column part that described integrated disc portions is extended, is used to surround the outer peripheral portion of described locating piece.
According to the present invention, be used for being installed to the described main shaft of described pump with respect to the locating piece that the axial direction of described main shaft is located described impeller, and provide a holder, it has the integrated disc portions with the end face contact of described locating piece, and, be used to surround the outer peripheral portion of described locating piece from the column part that described integrated disc portions is extended.Because described locating piece closely is engaged on the described main shaft by the state that described holder surrounds with described locating piece, put on described locating piece even be used for fixing the fastening force of described impeller, can prevent described locating piece distortion.
Of the present invention one preferred aspect in, described holder can have the internal diameter shape on the groove shape that is coupled to described main shaft.
Of the present invention one preferred aspect in, the described column part of described holder can perhaps can be arranged on the outer peripheral portion close vicinity with described locating piece with the contact of the outer peripheral portion of described locating piece.
Description of drawings
Fig. 1 is the vertical section figure of vertical-type multistage pump according to an embodiment of the invention;
Fig. 2 is the sectional view of the amplification of adjacent interstage casings shown in Figure 1;
Fig. 3 is the view of the inside of the interstage casings seen of the arrow III from Fig. 2;
Fig. 4 is the partial section of the amplification of multistage pump shown in Figure 1;
Fig. 5 is the vertical section figure that first of vertical-type multistage pump shown in Figure 1 is revised example;
Fig. 6 is the vertical section figure that second of vertical-type multistage pump shown in Figure 1 is revised example;
Fig. 7 is the perspective exploded view of main shaft, divided ring (spliting ring) and ring casting die;
Fig. 8 is the perspective view of the partial cross section under the state that is assembled together of main shaft, divided ring and ring casting die;
Fig. 9 is the vertical section figure of the example of traditional multistage pump.
Embodiment
Describe centrifugal pump according to an embodiment of the invention below with reference to the accompanying drawings in detail.As a example according to centrifugal pump of the present invention, the vertical-type multistage pump that description is comprised a plurality of vertical stacking interstage casings that formed by the steel plate pressing process and be contained in a plurality of impellers in the interstage casings separately.In Fig. 8, identical or corresponding parts are all being represented with identical or corresponding reference number in the accompanying drawing, and description separately has been omitted at Fig. 1.
Fig. 1 is the vertical section figure of vertical-type multistage pump according to an embodiment of the invention.Vertical-type multistage pump according to the present invention comprises a plurality of vertical stacking interstage casings 1 that form by the steel plate pressing process, be positioned at a upper shell 2 above the uppermost interstage casings 1, be positioned at a lower shell body 3 below the nethermost interstage casings 1, and held the frame 4 that the interstage casings 1 of piling up links to each other with upper shell 2 and with lower shell body 3.A pump pedestal 5 is positioned at lower shell body 3 belows, and a motor base 6 that is used for the support motor (not shown) is positioned at frame 4 and upper shell 2 tops.
Pump pedestal 5 and motor base 6 are connected to each other by a plurality of housing bolts 8 and a plurality of nut 9.Particularly, the lower end of housing bolt 8 is screwed in the pump pedestal 5, and nut 9 is spun on the upper end separately of housing bolt 8, and multistage whereby interstage casings 1, upper shell 2 and lower shell body 3 remain between pump pedestal 5 and the motor base 6.And the top and bottom of frame 4 are assembled to respectively in lower shell body 3 and the motor base 6, make frame 4 be supported between lower shell body 3 and the motor base 6.The assembled portion of the assembled portion of frame 4 and lower shell body 3 and frame 4 and motor base 6 has O shape circle 7 and 7.
Frame 4 constitutes urceolus, is used to prevent owing to the pump operated press water that produces (pressured fluid) leaks into outside the pump.The frame 4 that constitutes urceolus has two ends, and the end is pressed into shaped portion 4f, and 4f is used for installing sealing and encloses 7,7 with O shape.Shaped portion 4f, 4f have the end that radially outward expands, and are used to prevent that O shape circle 7,7 from coming off therefrom.The tapering part that radially outward expands is formed at an end of an element (lower shell body 3 or inner piece 40 (back description)) that is used to hold frame 4, make that the O shape that the part that is formed 4f keeps is enclosed 7 and can easily be inserted in the described element (lower shell body 3 or inner piece 40) when frame 4 is connected in lower shell body 3 and motor base 6.
A plurality of impellers 11 are fixed on the main shaft 10, and each impeller 11 is contained in each interstage casings 1.Main shaft 10 comprises a splined shaft, and each impeller 11 within it circumferential section have a plurality of grooves that are fitted on the splined shaft.
Fig. 2 is the sectional view of an amplification, shows the part of the structure that comprises interstage casings shown in Figure 11.In the present invention, each interstage casings 1 is the form of hydrostatic column substantially.Concrete, as shown in Figure 2, each interstage casings 1 comprise one first column part 21, from an outstanding protruding part 22 of first column part, 21 outward radials, from one first bottoms 23 that protruding part 22 inwardly radially extends, from first bottom, 23 axially extended one second column parts 24 and one second bottom 25 extending radially inwardly from second column part 24.Interstage casings 1 is made by press forming by corrosion resistant plate.
Protruding part 22 has maximum external diameter, greater than the external diameter of first column part 21.The external diameter of second column part 24 is slightly smaller than the internal diameter of first column part 21.First bottom 23 is arranged such that it hangs down as for first column part 21.First column part 21 has an axial end 21a, and the whole surface of cardinal principle that this axial end remains on axial end 21a contacts with first bottom 23 of adjacent interstage casings 1.As long as the end face 21a of first column part 21 can keep the area of contact that contact with adjacent first bottom 23, first bottom 23 just can be with respect to 21 one-tenth predetermined angle earth tilt of first column part, rather than vertical as for first column part 21.
The curved shape of hemisphere or cardinal principle hemisphere is formed on second bottom 25 of interstage casings 1.Intake panel 30 links to each other with second bottom 25 by welding.A plurality of return guide vanes 34 insert between intake panel 30 and the side plate 32, and link to each other with side plate 32 with intake panel 30 by welding.Intake panel 30 also forms the curved shape of hemisphere or cardinal principle hemisphere, so that keep the contact with the surface of second bottom 25.Intake panel 30 has an excircle end face 30a, and it keeps the internal surface contact with first column part 21 of housing between adjacent level 1.The internal surface of first column part 21 of intake panel 30, second column part 24, first bottom 23 and adjacent interstage casings 1 is formed for holding the space of O shape circle 27.Therefore, according to the present invention, interstage casings 1 has the simple structure that can simply make by press forming.Therefore, might easily be formed for being located at the space of the O shape circle between the adjacent interstage casings accurately.Therefore, might keep stable sealability and stable sealed precision.The gap of this O of being used for shape circle can change shape, makes the O shape circle that can commercially obtain be assembled in the space.Therefore, owing to can use any commercial O shape circle that obtains, the manufacture cost of pump can reduce.And because the curved shape of hemisphere or cardinal principle hemisphere is formed on second bottom 25 of interstage casings 1, interstage casings 1 has high crushing resistance.
Grommet 28 is installed on the penetrale 26 of second bottom 25 of interstage casings 1, leaks in the suction side of impeller 11 to prevent high pressure water.
Baffle plate 36 is arranged in the interstage casings 1, to cover the outer peripheral portion of projection 22, first bottom 23, second column part 24 and second bottom 25.Baffle plate 36 links to each other with second bottom 25 of interstage casings 1 by welding.Even the such solid matter of image-stone head flows in the interstage casings 1, baffle plate 36 also can protect the outer peripheral portion of projection 22, first bottom 23, second column part 24 and second bottom 25 not influenced by solid matter.Especially, baffle plate 36 has been protected the step part of the corner part that is formed at interstage casings 1.Baffle plate 36 can omit according to the purpose of pump need not.
Fig. 3 is the view of the arrow III direction of Fig. 2.Fig. 3 shows the inside of interstage casings 1.As shown in Figure 3, baffle plate 36 has spline structure in its inner radial.Especially, baffle plate 36 has some recess that extends radially outwardly (groove) 36a.Therefore, second bottom 25 of interstage casings 1 is exposed at the recess 36a place of baffle plate 36, is covered by baffle plate 36 at other part places except the recess 36a of baffle plate 36.Therefore, by the recess 36a of baffle plate 36, depression and projection have been formed facing on the surface of impeller 11 of second bottom 25.The degree of depth of depression and the thickness of projection are corresponding to the thickness of baffle plate 36.By the rotation of impeller 11, rotating energy is applied in the fluid to place, the space between the impeller 11 and second bottom 25.Be formed at the lip-deep depression of second bottom 25 and the rotating energy that projection can reduce the fluid between the impeller 11 and second bottom 25.Therefore, might prevent the static pressure decline of the fluid between the impeller 11 and second bottom 25.Therefore, the thrust that puts on impeller 11 can reduce.
Then, with reference to the accompanying drawings 1 and 4 be described below be used to carry out the mechanical seal 12 of main shaft 10 by the shaft sealing of the part of pump case with and related elements.Fig. 4 is the partial section of the amplification of multistage pump shown in Figure 1.
As shown in figs. 1 and 4, be attached to the liquid contacting part branch of motor base 6 by the inner piece 40 of corrosion resistant plate pressing process manufacturing.Motor base 6 comprises castings of gray cast iron, and motor base 6 and inner piece 40 comprise a mold member, and this element is configured for closely covering the housing lid of the opening end of pump case.Inner piece 40 by press fit attached on the motor base 6.An annular portion 40a is formed on the inner circumferential portion of inner piece 40, and covers the hollow circuit cylinder part 44h of mechanical seal retainer 44.The end radially outward of the annular portion 40a of inner piece 40 expands, and makes inner piece 40 not break away from from motor base 6.And the excircle part 40b of inner piece 40 expands with the taper radially outward, makes O shape circle 7 easily to insert in the annular portion 40a.The top that cartridge type mechanical seal 12 is installed to main shaft 10 is to form the shaft sealing of certain part (hollow circuit cylinder part 6h), and this part is the part that main shaft 10 passes housing lid (being made of motor base 6 and inner piece 40).
According to multistage pump shown in Figure 1, comprise motor base 6 owing to be used for closely covering the housing lid of the opening end of pump case, this pedestal comprises thick that foundry goods is made, and inner piece 40 comprises thin part that mold member is made and attached to the outer surface of motor base 6, the rigidity of housing lid and corrosion stability can be guaranteed, and the compacting work of inner piece 40 can easily realize.And because inner piece 40 comprises thin-wall part, the cost of material of corrosion resistant plate can reduce.
And as shown in Figure 1, motor base 6 has vertical hole 6b and the sidewise hole 6c that is used for loading (priming) and ventilation (air-bleeder).The pipe of being made by stainless steel 51 is assembled in the vertical hole 6b, and is assembled in the sidewise hole 6c by the cylindrical receptacle-like member 52 that stainless steel is made.A plug 53 screws in the opening end of cylindrical receptacle-like member 52.
By the top layout shown in Fig. 1 and 4, to load in the motor base 6 that gray cast iron makes and the hole of ventilation usefulness in order to be formed on, pipe 51 and the cylindrical receptacle-like member 52 made by stainless steel are arranged at the liquid contacting part branch.Therefore, even motor base 6 is made by the gray cast iron with very weak corrosion stability, liquid contacting part in the motor base 6 divides all the material of being made by stainless steel as liner, therefore, has guaranteed the corrosion stability of liquid contacting part branch.The contact segment of inner piece 40 and pipe 51 and manage 51 and the contact segment of cylindrical receptacle-like member 52 by laser bonding, to guarantee water-stop.
As shown in figs. 1 and 4, cartridge type mechanical seal 12 comprises a cartridge sleeve 41, it is installed on the main shaft 10 and with main shaft 10 and rotates, a swivel assembly 42, it comprises and being installed on the cartridge sleeve 41 and with a rotating seal ring of cartridge sleeve 41 rotations, a stationary components 43 comprises a standstill seal ring with swivel assembly 42 sliding contacts, and a retainer 44, it keeps stationary components 43 and is fixed on the motor base 6.Retainer 44 comprises a column 44a, and its maintenance includes on the stationary components 43 of standstill seal ring and its has O shape circle 45.And by being laser-welded to a circular plate 44b on the column 44a.Column 44a has step part 44s, is used to keep including the stationary components 43 of standstill seal ring.Retainer 44 is fixed on the motor base 6 by utilizing a plurality of bolts 46 that circular plate 44b is fastened on the motor base 6.
On the other hand, the upper end of cartridge sleeve 41 has an axle sleeve casting die 47, and a plurality of set screw 48 is screwed into axle sleeve casting die 47.Cartridge sleeve 41 has through hole 41h in the position corresponding to set screw 48.By set screw 48 is fastened on the main shaft 10, sleeve presser 47 is with main shaft 10 rotations, so that cartridge sleeve 41 is with main shaft 10 rotations.Rotating seal ring presses the standstill seal ring by the pressure spring (not shown).And, between swivel assembly 42 that comprises rotating seal ring and cartridge sleeve 41, have an adjustment axle sleeve 49.
By top layout, under the situation that cartridge type mechanical seal 12 removes from main shaft 10, joiner 14 removes from main shaft 10 and main shaft 15, and the motor (not shown) removes from motor base 6 then.At this moment, above cartridge type mechanical seal 12, do not stay any parts, except the upper end portion of main shaft 10.Then, set screw 48 is unscrewed, and sleeve presser 47 becomes into free state with respect to main shaft 10, and bolt 46 removes from motor base 6 then.After this, retainer 44 uses driver or analog to promote.Therefore, the inner circumferential portion of the circular plate 44b of retainer 44 end face that begins coaxial cover pressing element 47 closely contacts.As a result, retainer 44, sleeve presser 47 and cartridge sleeve 41 promote integratedly.Then, retainer 44 further promotes, and therefore cartridge type mechanical seal 12 upwards removes from main shaft 10 with its integral body.
When cartridge type mechanical seal 12 is installed on the main shaft 10, kept comprising the swivel assembly 42 of rotating seal ring cartridge sleeve 41, kept comprising that the retainer 44 of stationary components 43 of standstill seal ring and the sleeve presser 47 that is installed in the upper end of cartridge sleeve 41 advance integratedly, and under this state, comprise that the assembly of the one of cartridge sleeve 41, retainer 44 and sleeve presser 47 is coupled on the main shaft 10 from the upper end of main shaft 10.After this, bolt 46 is screwed in the pump pedestal 6, and set screw 48 is fastened on the main shaft 10.Because the annular portion 40a of inner piece 40 has the end that radially outward expands, when mechanical seal 12 was installed, the O shape circle 45 that is kept by retainer 44 can easily insert in the annular portion 40a of inner piece 40.As shown in Figure 1, a divided ring 91 (back description) links to each other with main shaft 10, and when cartridge type mechanical seal 12 was installed on the main shaft 10, the end portion of cartridge type mechanical seal 12 began closely to contact with divided ring 91, locatees cartridge type mechanical seal 12 by this.
According to the cartridge type mechanical seal with top structure, only by joiner 14 and the motor (not shown) that is fixed to motor base 6 are removed, cartridge type mechanical seal 12 just can be installed on the main shaft 10 or from main shaft from the position of main shaft 10 tops and remove.Therefore, in order to change mechanical seal, needn't remove multistage interstage casings 1, impeller 11 and like.
And, according to cartridge type mechanical seal, because kept the retainer 44 of the stationary components (comprising the standstill seal ring) of mechanical seal to comprise column 44a and the circular plate 44b that links together by laser bonding, column 44a can form by processing a pipe a little, and circular plate 44b can form by stamping-out or similar approach.Therefore, the retainer 44 with bead can be by minimizing course of working manufacturing, and therefore manufacture cost can greatly reduce.
Then, will the operation of the multistage pump shown in Fig. 1 to 4 be described briefly.
When multistage pump in operation time, from suction nozzle 17 suctions liquid be introduced in the lower shell body 3, and by 11 pressurizations of the first order impeller in the nethermost interstage casings 1.The liquid of discharging from first order impeller 11 passes by the passage that blade 34 is limited that returns that is located between intake panel 30 and the side plate 32, and is introduced into then in the next stage impeller 11.In this way, liquid is by the pressurization of each impeller in each interstage casings 1, and passes when returning the passage that blade 34 and like thereof limit when liquid, and the pressure head of liquid is resumed.At last, liquid is positioned at higher level's final level impeller 11 pressurizations, and is passing by after returning the final grade of passage that blade 34 and analog thereof limit, and the pressure head of liquid is resumed.After this, liquid flows in the upper shell 2.A plurality of discharge orifice 2a are formed in the upper shell 2.Therefore, the liquid process discharge orifice 2a in the upper shell 2, and, be discharged into the outside from discharge nozzle 18 then then by the annular pass 55 of qualification between frame 4 and multistage interstage casings 1.Although what describe in the above embodiments is the vertical-type multistage pump, this pump also can be used as the horizontal type multistage pump.
Fig. 5 is vertical section figure, shows first of vertical-type multistage pump shown in Figure 1 and revises example.In multistage pump shown in Figure 5, cartridge type mechanical seal 12 can remove from main shaft 10, and the motor (not shown) need not be removed from motor base 6.And when being installed on the main shaft 10 of pump when cartridge type mechanical seal 12, motor does not need to remove from motor base 6.
The gap L 1 longer than the whole length of cartridge type mechanical seal 12 is formed between the main shaft 15 of the main shaft 10 of pump and motor.Therefore, cartridge type mechanical seal 12 can be removed under motor is installed to state on the motor base 6.Especially, split joiner 14 and remove from main shaft 10 and main shaft 15, and cartridge type mechanical seal 12 rises to space between the main shaft 15 of the main shaft 10 of pump and motor with its integral body then, cartridge type mechanical seal 12 can remove from main shaft 10 by this.
According to connecting structure shown in Figure 5, do not need to move as the motor of weight, and mechanical seal can only be examined and change by removing joiner.
Fig. 6 is vertical section figure, shows second of vertical-type multistage pump shown in Figure 1 and revises example.In multistage pump shown in Figure 6, box bracket 80 is fixed on the motor base 6, and the big ball bearing 81 that is used for being contained in the thrust loading that produces in the pump is contained in box bracket 80.The main shaft 10 of pump and the main shaft 15 of motor link to each other with second joiner 83 by first joiner 82.The gap L 2 longer than the whole length of cartridge type mechanical seal 12 is formed between the lower end of the upper end of main shaft 10 and first joiner 82.Therefore, cartridge type mechanical seal 12 can be removed under motor is installed to state on the box bracket 80.Especially, double-division type second joiner 83 removes from the main shaft 10 and first joiner 82, and cartridge type mechanical seal 12 rises to the main shaft 10 of pump and the space between first joiner 82 with its integral body then, and cartridge type mechanical seal 12 can remove from main shaft 10 by this.
According to connecting structure shown in Figure 6, do not need to move as the motor of weight, and mechanical seal can only be examined and change by removing joiner.
And by the box bracket 80 that has big ball bearing 81 in it is provided, the thrust loading that produces in the pump can be received by big ball bearing 81, therefore can use obtainable general cheaply small motor on the market.Therefore, the range of choice of motor can broaden, and comprises that the cost of the pump of motor can reduce.
Fig. 7 and Fig. 8 show the structure that is used for going up most on the main shaft 10 that impeller 11 is fixed to pump.Fig. 7 is the perspective exploded view of main shaft 10, divided ring 91 and ring casting die 92, and Fig. 8 is the perspective view of partial cross section, shows main shaft 10, divided ring 91 and the later state of ring casting die 92 assemblings.
As shown in Figure 7, near the position the upper end of the spline section 10s of main shaft 10 is formed with a circular groove 10g.Divided ring 91 is coupled in the circular groove 10g.Divided ring 91 constitutes a locating piece, is used for afterbody impeller 11 is positioned at respect to main shaft 10 axial position of main shaft 10.Ring casting die 92 below main shaft 10 shown in Figure 7 has an integrated disc portions 92a, it will contact with the end face of divided ring 91, and a column part 92b, its periphery from integrated disc portions 92a is vertically extended, and surrounds in order to the outer peripheral portion with divided ring 91.Ring casting die 92 constitutes holders, is used to keep being installed to the divided ring 91 on the main shaft 10.The ring casting die 92 that constitutes holder has a plurality of splines, plays the effect of internal diameter shape, cooperates with spline on the spline section 10s of main shaft 10.
At first, ring casting die 92 moves up along spline section 10s, and ring casting die 92 closely contacts with divided ring 91 on being installed on main shaft 10.At this moment, the column part 92b of ring casting die 92 begins to contact or be positioned at the outer peripheral portion of divided ring 91 proximity of the outer peripheral portion of divided ring 91.After this, multi-stage impeller 11 is installed on the main shaft 10, and last, and nut 93 is screwed to the lower end of main shaft 10, by this multi-stage impeller 11 is fixed on the main shaft 10, and what substitute divided ring 91 is also to use the C type snap ring 94 of main shaft 10 tops that are arranged among Fig. 7.
According to present embodiment, multi-stage impeller 11 is fixed on the main shaft 10 by tightening nut 93.At this moment, the fastening force of nut 93 is delivered on the divided ring 91 by ring casting die 92.And because divided ring 91 securely is coupled among the circular groove 10g of main shaft 10, this moment, divided ring 91 quilt ring casting dies 92 surrounded, and can prevent divided ring 91 distortion.As shown in Figure 1, divided ring 91 is used to locate the underpart of cartridge type mechanical seal 12 also as locating piece.
Industrial applicibility
The present invention can be applied to have at least one impeller of being fixed on the main shaft and extremely The centrifugal pump of a few housing, housing has held impeller, and by the gold as steel plate Belong to the pressing process (compressing) of sheet material and form.
Claims (38)
1. centrifugal pump comprises:
At least one impeller, described impeller are fixed on the main shaft that links to each other with a prime mover;
At least one housing is in order to corresponding with described impeller;
Housing lid, it is configured for sealing the opening end of described housing; And
Shaft sealer, it is located at the part place that described main shaft passes described housing lid;
Wherein, described housing lid comprises thick that is made by foundry goods, and securely is fixed to the thin inner piece against corrosion on described thick.
2. centrifugal pump according to claim 1 is characterized in that, described inner piece comprises a press forming spare.
3. centrifugal pump according to claim 1 is characterized in that, described inner piece securely is fixed to by press fit on described thick.
4. according to each described centrifugal pump among the claim 1-3, it is characterized in that described thick has the hollow circuit cylinder part that allows described main shaft to pass, and described inner piece has an annular portion, it is coupled on the described hollow circuit cylinder part.
5. centrifugal pump according to claim 4 is characterized in that, an end radially outward of the described annular portion of described inner piece expands, and makes described inner piece not separate with described thick.
6. centrifugal pump according to claim 5, it is characterized in that, expand with the taper radially outward in the described end of the described annular portion of described inner piece, make that the described end of the described annular portion of described inner piece is used to guide described packing ring when the packing ring of described shaft sealer inserts the described annular portion of described inner piece.
7. according to each described centrifugal pump among the claim 1-6, it is characterized in that, described thick of described housing lid has opening, atmospheric side and hydraulic fluid side communicate with each other by described opening, a pipe against corrosion is assembled in the described opening, and described pipe against corrosion and described inner piece are by being weldingly connected.
8. centrifugal pump according to claim 7 is characterized in that described welding is a laser bonding.
9. according to each described centrifugal pump among the claim 1-8, it is characterized in that, further comprise urceolus, be used to prevent that the pressured fluid that is produced by the operation of described pump from leaking into the outside of described pump, described urceolus has at least one shaped portion, is used in the one or both ends of described urceolus O shape circle being installed.
10. centrifugal pump according to claim 9 is characterized in that, an end radially outward of the described shaped portion of described urceolus expands, and comes off to prevent described O shape circle.
11. centrifugal pump according to claim 10 is characterized in that, the tapering part that radially outward expands is formed on the element that described urceolus is attached thereto, so that the insertion of the described O shape circle that is kept by described urceolus.
12. a centrifugal pump comprises:
At least one impeller, described impeller are fixed on the main shaft that links to each other with a prime mover;
At least one housing is in order to corresponding with described impeller;
Described centrifugal pump comprises multistage pump;
Described housing comprises a plurality of interstage casings of piling up of having held a plurality of impellers respectively;
Described interstage casings comprises first column part, keep with the axial end contact of housing between adjacent level first bottom, from axially extended second column part in described first bottom and second bottom that extends radially inwardly from described second column part; And
The curved shape of hemisphere or cardinal principle hemisphere is formed on described second bottom of described interstage casings.
13. centrifugal pump according to claim 12, it is characterized in that, an intake panel links to each other with described second bottom of described interstage casings, makes the excircle end face of described intake panel keep the internal surface contact with first column part of described adjacent interstage casings; And
Wherein, the described internal surface of described first column part of described intake panel, described second column part, described first bottom and described adjacent interstage casings forms the space that holds O shape circle.
14. centrifugal pump according to claim 13 is characterized in that, return guide vane inserts between described intake panel and the side plate.
15., it is characterized in that having a baffle plate in the described interstage casings according to each described centrifugal pump among the claim 12-14, so that cover at least one shaped portion of the corner between described first column part and described second bottom.
16. centrifugal pump according to claim 15 is characterized in that, described baffle plate has a plurality of recesses in its inner radial.
17. centrifugal pump according to claim 16 is characterized in that, the maximum diameter of described recess is less than the external diameter of described impeller.
18. according to each described centrifugal pump among the claim 12-17, it is characterized in that, further comprise a urceolus, be used to prevent that the pressured fluid that is produced by the operation of described pump from leaking into the outside of described pump, described urceolus has at least one shaped portion, is used in the one or both ends of described urceolus O shape circle being installed.
19. centrifugal pump according to claim 18 is characterized in that, an end radially outward of the described shaped portion of described urceolus expands, and comes off to prevent described O shape circle.
20. centrifugal pump according to claim 19 is characterized in that, the tapering part that radially outward expands is formed on the element that described urceolus is attached thereto, so that the insertion of the described O shape circle that is kept by described urceolus.
21. a centrifugal pump comprises:
At least one impeller, described impeller are fixed on the main shaft that links to each other with a prime mover;
At least one housing is in order to corresponding with described impeller;
Housing lid, it is configured for sealing the opening end of described housing; And
Mechanical seal, it is located at the part place that described main shaft passes described housing lid;
Wherein, described mechanical seal comprises an axle sleeve that has kept a rotating seal ring and be fixed in described main shaft, an and retainer that is configured for keeping a standstill seal ring, described retainer comprises column, it has kept being used to seal the Sealing of the liquid between described housing lid and the described column, and a disc; And
Wherein, described column and described disc are joined together to form described retainer.
22. centrifugal pump according to claim 21 is characterized in that, described disc comprises the flat board of being made by metal sheet.
23., it is characterized in that described column and described disc pass through laser bonding according to claim 21 or 22 described centrifugal pumps.
24. according to each described centrifugal pump among the claim 21-23, it is characterized in that, a gap of being longer than the whole length of described mechanical seal forms between the main shaft of the described main shaft of described pump and described prime mover, and described mechanical seal by will having connected described pump described main shaft and the joiner of the described main shaft of described prime mover remove and remove by described gap.
25. according to each described centrifugal pump among the claim 21-24, it is characterized in that, further comprise a urceolus, be used to prevent that the pressured fluid that is produced by the operation of described pump from leaking into the outside of described pump, described urceolus has at least one shaped portion, is used in the one or both ends of described urceolus O shape circle being installed.
26. centrifugal pump according to claim 25 is characterized in that, an end radially outward of the described shaped portion of described urceolus expands, and comes off to prevent described O shape circle.
27. centrifugal pump according to claim 26 is characterized in that, the tapering part that radially outward expands is formed on the element that described urceolus is attached thereto, so that the insertion of the described O shape circle that is kept by described urceolus.
28. a centrifugal pump comprises:
At least one impeller, described impeller are fixed on the main shaft that links to each other with a prime mover;
At least one housing is in order to corresponding with described impeller;
Housing lid, it is configured for sealing the opening end of described housing;
Mechanical seal, it is located at the part place that described main shaft passes described housing lid;
Wherein, described mechanical seal comprises the axle sleeve that has kept rotating seal ring and be fixed in described main shaft, and the retainer that is configured for keeping the standstill seal ring, described retainer comprises a column, it has kept being used to seal the Sealing of the liquid between described housing lid and the described column, and a disc; And
Wherein, positioning piece is connected in described main shaft, and the described axle sleeve of described mechanical seal keeps locating described mechanical seal by this with described locating piece contact.
29. centrifugal pump according to claim 28 is characterized in that, described retainer has similar step part, is used to keep described standstill seal ring.
30. according to claim 28 or 29 described centrifugal pumps, it is characterized in that, further comprise a urceolus, be used to prevent that the pressured fluid that is produced by the operation of described pump from leaking into the outside of described pump, described urceolus has at least one shaped portion, is used in the one or both ends of described urceolus O shape circle being installed.
31. centrifugal pump according to claim 30 is characterized in that, an end radially outward of the described shaped portion of described urceolus expands, and comes off to prevent described O shape circle.
32. centrifugal pump according to claim 31 is characterized in that, the tapering part that radially outward expands is formed on the element that described urceolus is attached thereto, so that the insertion of the described O shape circle that is kept by described urceolus.
33. a centrifugal pump comprises:
At least one impeller, described impeller are fixed on the main shaft that links to each other with a prime mover, and described main shaft has a plurality of grooves at its external peripheral surface, are used to allow described impeller assembling and allow to prevent that described impeller is with respect to described main axis rotation;
At least one housing is in order to corresponding with described impeller;
Locating piece is used for locating described impeller with respect to the axial direction of described main shaft; And
Holder, it has the integrated disc portions with the end face contact of described locating piece, and from the column part that described integrated disc portions is extended, is used to surround the outer peripheral portion of described locating piece.
34. centrifugal pump according to claim 33 is characterized in that, described holder has the internal diameter shape on the described flute profile that is coupled to described main shaft.
35., it is characterized in that the described column part of described holder perhaps is positioned at the described outer peripheral portion close vicinity with described locating piece with the outer peripheral portion contact of described locating piece according to claim 33 or 34 described centrifugal pumps.
36. according to each described centrifugal pump among the claim 33-35, it is characterized in that, further comprise a urceolus, be used to prevent that the pressured fluid that is produced by the operation of described pump from leaking into the outside of described pump, described urceolus has at least one shaped portion, is used in the one or both ends of described urceolus O shape circle being installed.
37. centrifugal pump according to claim 36 is characterized in that, an end radially outward of the described shaped portion of described urceolus expands, and comes off to prevent described O shape circle.
38., it is characterized in that the tapering part that radially outward expands is formed on the element that described urceolus is attached thereto according to the described centrifugal pump of claim 37, so that the insertion of the described O shape circle that keeps by described urceolus.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004210735A JP4633396B2 (en) | 2004-07-16 | 2004-07-16 | Centrifugal pump |
| JP210735/2004 | 2004-07-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1989347A true CN1989347A (en) | 2007-06-27 |
Family
ID=34959225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004800436049A Pending CN1989347A (en) | 2004-07-16 | 2004-11-12 | Centrifugal pump |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20080019831A1 (en) |
| EP (1) | EP1774181A1 (en) |
| JP (1) | JP4633396B2 (en) |
| CN (1) | CN1989347A (en) |
| WO (1) | WO2006008843A1 (en) |
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| CN101832272A (en) * | 2009-03-10 | 2010-09-15 | 格伦德福斯管理联合股份公司 | Multi-stage centrifugal pump assembly |
| CN102192190A (en) * | 2010-03-18 | 2011-09-21 | 卡尔佩达有限公司 | Improved tight multi-stage pump |
| CN105485505A (en) * | 2016-01-03 | 2016-04-13 | 詹白勺 | Quick start vertical multistage centrifugal oil pump with sealed valve element and valve cover |
| CN109209988A (en) * | 2018-11-22 | 2019-01-15 | 无锡市海星船舶动力有限公司 | The compressor impeller of detection function is uniformly distributed with blade |
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- 2004-11-12 CN CNA2004800436049A patent/CN1989347A/en active Pending
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- 2004-11-12 WO PCT/JP2004/017203 patent/WO2006008843A1/en active Application Filing
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| CN101832272A (en) * | 2009-03-10 | 2010-09-15 | 格伦德福斯管理联合股份公司 | Multi-stage centrifugal pump assembly |
| US8568093B2 (en) | 2009-03-10 | 2013-10-29 | Grundfos Management A/S | Multi-stage centrifugal pump assembly (bearing carrier) |
| CN101832272B (en) * | 2009-03-10 | 2014-04-09 | 格伦德福斯管理联合股份公司 | Multi-stage centrifugal pump assembly |
| TWI495798B (en) * | 2009-03-10 | 2015-08-11 | Grundfos Management As | Multi-stage centrifugal pump assembly |
| CN102192190A (en) * | 2010-03-18 | 2011-09-21 | 卡尔佩达有限公司 | Improved tight multi-stage pump |
| CN102192190B (en) * | 2010-03-18 | 2014-01-29 | 卡尔佩达有限公司 | Improved tight multi-stage pump |
| CN105485505A (en) * | 2016-01-03 | 2016-04-13 | 詹白勺 | Quick start vertical multistage centrifugal oil pump with sealed valve element and valve cover |
| CN109209988A (en) * | 2018-11-22 | 2019-01-15 | 无锡市海星船舶动力有限公司 | The compressor impeller of detection function is uniformly distributed with blade |
| CN109209988B (en) * | 2018-11-22 | 2024-04-12 | 无锡市海星船舶动力有限公司 | Compressor impeller with blade uniform distribution detection function |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4633396B2 (en) | 2011-02-16 |
| WO2006008843A1 (en) | 2006-01-26 |
| US20080019831A1 (en) | 2008-01-24 |
| EP1774181A1 (en) | 2007-04-18 |
| JP2006029241A (en) | 2006-02-02 |
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