CN105889135A - Suppressing device for a vertical pump, vertical pump and method for retrofitting a vertical pump - Google Patents
Suppressing device for a vertical pump, vertical pump and method for retrofitting a vertical pump Download PDFInfo
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- CN105889135A CN105889135A CN201610078695.4A CN201610078695A CN105889135A CN 105889135 A CN105889135 A CN 105889135A CN 201610078695 A CN201610078695 A CN 201610078695A CN 105889135 A CN105889135 A CN 105889135A
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- restraining device
- post element
- vertical pump
- stiffener
- column jecket
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000009420 retrofitting Methods 0.000 title abstract 2
- 238000005086 pumping Methods 0.000 claims abstract description 40
- 230000004323 axial length Effects 0.000 claims abstract description 32
- 230000000452 restraining effect Effects 0.000 claims description 130
- 239000003351 stiffener Substances 0.000 claims description 76
- 230000018109 developmental process Effects 0.000 claims description 29
- 239000012530 fluid Substances 0.000 claims description 27
- 230000000295 complement effect Effects 0.000 claims description 3
- 230000001629 suppression Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 11
- 230000008859 change Effects 0.000 description 8
- 230000009471 action Effects 0.000 description 7
- 239000007788 liquid Substances 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000002730 additional effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 210000001364 upper extremity Anatomy 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
- F04D13/083—Units comprising pumps and their driving means the pump being electrically driven for submerged use and protected by a gas-bell
-
- 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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/043—Shafts
-
- 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
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/528—Casings; Connections of working fluid for axial pumps especially adapted for liquid pumps
-
- 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
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/64—Mounting; Assembling; Disassembling of axial pumps
- F04D29/648—Mounting; Assembling; Disassembling of axial pumps especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D3/00—Axial-flow pumps
- F04D3/005—Axial-flow pumps with a conventional single stage rotor
-
- 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
- F05D2230/50—Building or constructing in particular ways
- F05D2230/51—Building or constructing in particular ways in a modular way, e.g. using several identical or complementary parts or features
-
- 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
- F05D2230/80—Repairing, retrofitting or upgrading methods
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a suppressing device for a vertical pump, the vertical pump and a method for retrofitting a vertical pump. Specifically, the suppressing device shifts a structural natural frequency of a pump, the pump including a pumping unit with an inlet and an impeller, a discharge unit with an outlet, a drive unit for rotating the impeller, a column pipe extending in an axial direction and having at least one column element with an axial length, the column pipe connecting the pumping unit with the discharge unit, and a line shaft extending within the column pipe operatively connecting the drive unit with the pumping unit. The suppressing device includes at least one rib extending essentially in a radial direction, and is perpendicular to an axial direction of the suppression device. The suppression device has an extension extending in the axial direction of the suppressing device, is at least half the axial length of the column element, and is configured to closely fit around an entire circumference of the column element.
Description
Technical field
The present invention relates to the restraining device of the natural frequency of structures for changing vertical pump and relate to the vertical pump of preamble according to independent device claim.The method that the invention further relates to improve vertical pump.
Background technology
Vertical pump, particularly large-scale vertical pump have been successfully used to multiple application.Vertical pump for concrete application usually produces according to the specification of user, or mates real needs in detail.
Among other things, the important applied field of vertical pump is used to have: cooling tower；Application in cooling water system, such as in nuclear power plant or other kinds of power plant；For wastewater disposal basin or the draining of overflow launder, with anti-flooding, vertical pump is also successfully used for the draining in large area soil.Vertical pump is also widely used for supplying water, especially at the supply respect of drinking water, or as main pump or auxiliary pump in open or close system.Other application are the fire-fightings in greater coasting area (oil or the production of natural gas), such as, be applied to oil platform and Floating Production storage and unloading unit (FPSO).Additionally, other application of the whole series of vertical pump are known to those of ordinary skill in the art.
Vertical pump can be designed as single-stage pump and multistage pump.They are typically submerged in and will carry out in the liquid storage device pumped so that at least import or suction funnel is immersed in fluid to be pumped together with adjacent pump rotor, so that pump can directly prepare to run.
One typical case of vertical pump and known setting (for example, see Fig. 1) include having for carrying fluid and the entrance being dipped in reservoir and the pumping unit of impeller.This pumping unit is connected to the exhaust unit with the outlet for fluid by the column jecket extended straight up.The driver element for driving impeller it is provided with on the top of exhaust unit.Driver element is operationally connected with impeller by the pipeline axle extended in column jecket.In some applications, spool axle by the internal axially extending tube-carrier of axis of a cylinder around.Generally, vertical pump is supported by the supporting construction being arranged in lower section and neighbouring exhaust unit, so that the major part of pumping unit and column jecket is hung without supporting further.
The natural frequency of structures that one of problem of vertical pump is installed by pump causes.In the past, vertical pump designed the most by rule of thumb.Analyzing method reliably owing to lacking, the majority of these pumps is designed to its natural frequency of structures at or approximately at the exploitation speed of this pump or its integral multiple or its half integer multiple.Such as, when pump is 1800
When running under rpm, the frequency of corresponding 30 hertz.Thus, if 30 hertz of correspondences or the natural frequency of structures close to system, then pump will run with the speed of the natural frequency of structures corresponding to pumping system.When this coupling particularly produces sizable load consequence on bearing, it may result in the premature failure of such as bearing or major axis.In addition, it may create excessive wear or other impact negatively deteriorated.
In many cases, such as in power plant or nuclear facilities, user is unwilling to change whole existing pump or user and loses interest in the redesign completely of its pump.On the contrary, the problem that user tends to improve and solution solves to be caused by described resonance effects after sale.
In order to solve these problems, a kind of known means are to add a point mass, such as in the specific location of column jecket at the ad-hoc location of vertical pump.This point mass reduces the natural frequency of structures of system.Effective for accomplishing, it is necessary to provide the weight as much as possible concentrating on an ad-hoc location, such as, at a node of vibration, this is owing to more weight is disperseed or away from this focus, then the impact on reducing the natural frequency of vibration is the least.
Although this method has proven to successfully in numerous applications, but still suffer from some and limit or defect.This is probably for effectively reducing the point mass needed for the natural frequency of vibration too big, so that vertical pump structurally can not support it.In other applications, space environment does not allow point mass installation at desired location.Additionally, fact proved that the method utilizing point mass in some applications does not the most produce desired effect.
Summary of the invention
Based on prior art, it is an object of the invention to propose a kind of restraining device, this restraining device is for changing the natural frequency of structures of vertical pump, with such effective means so that can avoid aforementioned described resonance effects.This restraining device should be prone to structure, and is easily installed.Especially, this restraining device should be suitable to improve existing vertical pump in the way of simple and cost are imitated.Furthermore it is also an object that propose a kind of vertical pump, this vertical pump allows to change its natural frequency of structures in the way of simple and cost-effective.Additionally, a further object of the present invention is to propose a kind of method improving existing vertical pump, the method allows to change the natural frequency of structures of vertical pump.
The theme meeting these purposes of the present invention is that the feature by independent claims characterizes.
Therefore, according to the invention it is proposed that a kind of restraining device, described restraining device is for changing the natural frequency of structures of vertical pump, and described pump includes: pumping unit, and described pumping unit has entrance and for carrying the impeller of fluid；Exhaust unit, described exhaust unit has the outlet for described fluid；Driver element, described driver element is used for rotating described impeller；Column jecket, it extends in the axial direction, and described column jecket includes that at least one has the post element of axial length, and described pumping unit is connected by described column jecket with described exhaust unit；And major axis, it extends in described column jecket, and is operably connected with described pumping unit by described driver element；Wherein, described restraining device is designed to and is suitable to closely assemble around the whole circumference of described post element, the development length that described restraining device has on described axial direction is at least the half of the axial length of described post element, and described restraining device also includes that at least one is substantially being perpendicular to the rib extended in the radial direction of described axial direction.
Closely assembling by described restraining device being arranged about the whole circumference of described post element, having reached to make the described pump structure natural frequency of vibration change to this stiffening effect of higher frequency.Close fit around described post element creates extruding, and this extruding ensure that the rigidity transfer of described post element.This clamping action is equivalent to add the wall thickness of described post element.It addition, at least one rib substantially extended in radial direction adds its rotary inertia, this improves the most again the natural frequency of vibration of described pump.Therefore, described rib extends along the whole length of stiffening device preferably with respect to axial direction.In this way, the original structure natural frequency of vibration can change to higher value from critical value.
According to a preferred embodiment, restraining device development length on described axial direction is equal to the axial length of described post element, and described restraining device assembles around described post element in assembled state.By taking this measure, particularly effective enhancing effect is achieved.
In order to provide the most simply installing of described restraining device, the most described restraining device includes multiple stiffener, described stiffener circumferentially direction bends, and can be connected to each other and be complementary to one another in the assembled state and become tubular structure, closely assemble for being centered around the whole circumference of described post element.This allows to placed around described post element by described stiffener and make them be fixed to one another, such as by the way of screw.
In order to increase rotary inertia, it is advantageous to each stiffener has two side ribs extended in radial directions, each side rib forms the end relative to circumferential direction of described stiffener.
According to a particularly preferred embodiment, described restraining device includes four stiffeners, and each described stiffener is respectively provided with the mid portion of quadrant shape cross section, and described mid portion extends between two described side ribs.This embodiment offers the extremely simple of described restraining device and quickly install.Preferably, four described stiffeners are the most identical.
In order to described restraining device is fixed into closely around described post element with obtain needed for clamping action, it is advantageous to each side rib is provided with the multiple holes for receiving fixing device, to be rigidly attached adjacent stiffener.This fixing device is preferably screw and nut.
Change and according to corresponding application to realize the expectation of natural frequency of structures, it may be advantageous at least one stiffener has the intermediate rib extending in radial directions and being disposed between two side ribs.
Additionally, according to the invention it is proposed that a kind of vertical pump for carrying fluid, described vertical pump includes: pumping unit, described pumping unit has entrance and for carrying the impeller of fluid；Exhaust unit, described exhaust unit has the outlet for described fluid；Driver element, described driver element is used for rotating described impeller；Column jecket, described column jecket extends in the axial direction, and has at least one post element with axial length, and described pumping unit is connected by described column jecket with described exhaust unit；And major axis, described major axis extends in described column jecket, and is operably connected with described pumping unit by described driver element；Wherein, at least one post element of described column jecket is provided with the restraining device according to present invention design, described restraining device is around the whole circumference close fit of described post element, and the development length that has on described axial direction of described restraining device is at least the half of axial length of described post element.
As restraining device as described in above-mentioned contact explains, it is provided with and allows to easily suppress the critical structures natural frequency of vibration of described pump by changing these critical frequencies to higher value according to the vertical pump of restraining device of the present invention.
It is preferred that described restraining device is detachably connected to described post element, this is because by this measure, can modify the pump existed, make them become the vertical pump according to the present invention by this way.Additionally, this measure is favourable from the point of view of structural point.
In order to realize the change of particularly effective natural frequency of structures, preferably, the development length on described axial direction of described restraining device, equal to the described axial length of described post element, that is to say, described restraining device covers described post element along the whole axial extension of described post element.
In the case of column jecket comprises multiple post element, favourable measure is, at least two post element is provided with corresponding restraining device.In numerous applications, it may be preferred that each single described post element is provided with corresponding restraining device.
Additionally, according to the invention it is proposed that a kind of method improving vertical pump, described pump includes: pumping unit, described pumping unit has entrance and for carrying the impeller of fluid；Exhaust unit, described exhaust unit has the outlet for described fluid；Driver element, described driver element is used for rotating described impeller；Column jecket, described column jecket extends in the axial direction, and includes that at least one has the post element of axial length, and described pumping unit is connected by described column jecket with described exhaust unit；And major axis, described major axis extends in described column jecket, and is operably connected with described pumping unit by described driver element；Said method comprising the steps of:
Thering is provided the restraining device being used for changing the natural frequency of structures of described vertical pump, described restraining device designs according to the present invention；
Select at least one in described post element；
Described restraining device to be installed to described post element in the way of the whole circumference close fit of described post element.
Restraining device according to the present invention is particularly suited for improving existing vertical pump.If there is resonance problem in a specific vertical pump, such as, owing to the natural frequency of structures of pump facility is equal with the exploitation speed of described pump or closely, so the method according to the invention is by changing described natural frequency of structures to higher value, it is provided that a kind of for suppressing efficient, the simplest and cost-effective solution of the described natural frequency of vibration.It is therefore not necessary to pump is redesigned completely.Described resonance problem can have been resolved by suitable restraining device is supplied to the column jecket of pump.
For reasons of as described above same, it is preferred that the development length that described restraining device is arranged on described axial direction is equal to the axial length of described post element.
Installation for the ease of described restraining device, preferably, described restraining device includes multiple stiffener, preferably four described stiffeners, wherein, described stiffener is disposed in around described post element, and described stiffener is fixed to one another to be centered around the whole circumference close fit of described post element.
Described column jecket is included to the application of more than one post element, it is preferred that multiple post elements are chosen, and each selected post element is provided with a single restraining device.
The more useful measure of the present invention and embodiment will become obvious from dependent claims.
Accompanying drawing explanation
The present invention is described in detail below by reference to accompanying drawing.As is illustrated schematically:
Fig. 1 is the sectional view of vertical pump well known in the prior art,
Fig. 2 is the decomposition diagram of the first embodiment according to restraining device of the present invention, wherein has the post element of vertical pump,
Fig. 3 is the perspective view of the stiffener of the first embodiment shown in Fig. 2,
Fig. 4 is the sectional view along the cross section being perpendicular to axial direction of stiffener shown in Fig. 3,
Fig. 5 is the perspective view of post element, and wherein the first embodiment of restraining device is mounted on,
Fig. 6 is the schematic cross sectional views of the embodiment of the vertical pump according to the present invention,
Fig. 7 with Fig. 4 is similar, but about a kind of deformation of stiffener, and
Fig. 8 is the sectional view of the second embodiment of the restraining device according to the present invention.
In the diagram of different embodiments, identical parts or there are the parts of identical function or roughly the same function by identical reference instruction.
Detailed description of the invention
Fig. 1 shows the sectional view of the vertical pump in its overall by reference number 1 instruction.Such vertical pump 1 is well known in the art.But, with reference to Fig. 1 be given general to describe the embodiment for the vertical pump 1 according to the present invention shown in Fig. 6 be also effective.
Fig. 1 shows to be in and generally runs the vertical pump 1 in orientation, and that is to say, it is in vertically-oriented.Hereinafter relate to the relational language of position, such as " upper " or " under ", all referring to the operative orientation shown in Fig. 1.
Vertical pump 1(Fig. 1) include the pumping unit 2 that is positioned at pump 1 lower end.Pumping unit 2 is provided with entrance 21 and for carrying the impeller 22 of fluid (such as water).Tubulose column jecket 3 extends from the upper end of pumping unit 2 pumping unit 2 is connected to exhaust unit 4 straight up, and exhaust unit 4 has the outlet 41 for discharging pumped fluid.Column jecket 3 is extended in the axial direction A limited by the axis of column jecket 3, and when pump 1 is in its common operation orientation, axial direction A just overlaps with vertical direction.Column jecket 3 includes multiple (in the present embodiment being 5) post element 31, and these post elements 31 are arranged in after another by one relative to axial direction A.Each tubular post element 31 axially end is provided with flange 32, and flange 32 for being accordingly connected to adjacent post element 31 or pumping unit 2 or exhaust unit 4 by post element 31.
For driving the driver element 5 of the impeller 22 of pump 1 to be disposed in the top of exhaust unit 4.Driver element 5 can be such as electro-motor or other motor.Driver element 5 is operationally connected with impeller 22 by the center of column jecket 3 and the major axis 6 that co-axially extends.Major axis 6 is supported by multiple bearings 61.Whole axially extending along major axis 6, generally near each two adjacent pillars element 31 junction, bearing 61 is arranged to support and guide major axis 6.According to concrete application, tube-carrier can be arranged to, around major axis 6, extend coaxially into column jecket 3, and define major axis 6 relative to the remainder within column jecket 3.Such as, if the fluid carried should be avoided to contact with major axis 6, then this measure may be utilized.
Depending on that ruuning situation, vertical pump 1 are supported by supporting construction (not shown in figure 1), this supporting construction the most nearby and comes support vertical pump 1, such as, the horizontal position that arrow B represents in FIG below exhaust unit 4.Pump bottom free suspension below supporting construction, that is to say, it is not necessary to extra support so that it is bottom is immersed in the liquid storage device of fluid to be pumped.If fluid is water, then described reservoir can be river, lake, sea, storage tank or water cooling pond.The liquid level of the storage tank i.e. liquid level of vertical pump surrounding fluid, the given horizontal level that this liquid level is usually located between the upper end of pumping unit 2 and the lower end of exhaust unit 4.Thus, in the running of pump, at least pumping unit 2 is to be completely immersed in the fluid waiting to be carried.The impeller 22 that drived unit 5 and major axis 6 drive aspirates fluid by entrance 21, and is delivered fluid to exhaust unit 4 by column jecket 3 and be transported to export 41.
Known vertical pump 1 can produce resonance effects, and described resonance effects is harmful to himself.Especially, resonance effects may result in such as major axis 6 and the premature failure of bearing (such as bearing 61).Such as, when the slewing rate of the exploitation speed of pump 1 or impeller 22 is corresponding to or frequency closely equal with natural frequency of structures, these effects can occur.These resonance effects are it may happen that in pump that is existing and that be currently running, and occur in newly constructed pump.
In order to solve these resonance problems, the present invention proposes a kind of natural frequency of structures for changing vertical pump 1 and therefore suppresses the restraining device of its original natural frequency of vibration.
Fig. 2 shows the decomposition diagram of the first embodiment of the restraining device according to the present invention, and it indicates with reference 10 generally.In order to be better understood from, Fig. 2 additionally illustrates the perspective view of the post element 31 of column jecket 3.Restraining device 10 is designed to and is suitable to the whole circumference close fit around post element 31.The restraining device 10 development length L in axial direction A be at least restraining device 10 around the half of axial length C of post element 31.Preferably, as shown in the first embodiment of restraining device 10, the development length L in axial direction A is equal to axial length C, that is to say, is in installment state, and restraining device 10 covers the whole side surface (seeing Fig. 5) of post element 31.
The distance defining between two flanges 32 of post element 31 is meant, say, that the distance between lower edge and the upper limb of lower flange 32 of the upper flange 32 of corresponding post element 31 about the statement " axial length " of post element 31.
Restraining device 10 includes that at least one is substantially being perpendicular to the rib 11 extended in the radial direction of described axial direction A.
First preferred embodiment of restraining device 10 includes multiple stiffener 12, specifically, including four stiffeners 12.Four stiffeners 12 are substantially the same.In order to be better understood from, Fig. 3 shows the perspective view of in these stiffeners 12, and Fig. 4 is a sectional view in the cross section being perpendicular to axial direction A in these stiffeners 12.It addition, Fig. 5 shows the perspective view of post element 31, wherein restraining device 10 is mounted east thereon.
Each stiffening device 12 circumferentially direction bends, and may be connected to adjacent stiffener 12.Four stiffeners 12 supplement to form the tubular structure with certain interior diameter the most each other, and described interior diameter is corresponding with the overall diameter D of post element 31 or is slightly less than post element 31 overall diameter D.Thus, being in assembling and during installment state, four stiffeners 12 are around the whole circumference close fit of post element 31 and produce clamping action.By the close fit of this whole circumference around post element 31, restraining device 10 provides the wall thickness of post element 31 to be increased, and this enhances the most again post element 31, and therefore changes natural frequency of structures to higher value.
As shown in Figure 3 and Figure 4, each stiffener 12 is respectively provided with the mid portion 121 of the cross section of quadrant shape, and has two side ribs 11 extended in a radial direction.Each side rib 11 forms the end about its circumferencial direction of stiffener 12.The mid portion 121 of each stiffener 12 extends between two side ribs 11.
Stiffener 12 can manufacture by selecting certain material, preferred metal materials, itself and the material compatible of post element 31.Being initiateed by the rectangular plate of material, two parallel end margins of rectangular plate are bent, until each edge-perpendicular extends in the remainder of sheet material.After this, rectangular plate is bent, until mid portion 121 is manipulated into so that it has the cross section of quadrant shape.
As the most visible in Fig. 4, the curvature that mid portion 121 has is corresponding to the radius R limited in advance by the overall diameter D of post element 31.As previously discussed, radius R is most preferably equal to the half of overall diameter D of post element 31.Stiffener 12 has thickness T, preferably (but dispensable), and thickness T is uniform on whole stiffener 12.Preferably, two side ribs 11 development length RL in radial directions is preferably for being identical for two side ribs 11.But, two side ribs 11 development length RL in radial directions is likely to difference.
Relative to axial direction A, it is preferable that two side ribs 11 have identical axial length AL(and see Fig. 3), and axial length AL is equal to restraining device 10 development length L in the axial direction.It is thus preferable that each side rib 11 in axial direction A extends in the whole length of stiffener 12.But, according to concrete application, the axial length AL of side rib 11 is likely to less than the restraining device 10 development length L in axial direction A.Therefore, the mid portion 121 of stiffener 12 may be more longer than side rib 11 in axial direction A.This is probably useful, such as not enough so that in the application that extends on the whole development length L of restraining device 10 of side rib 11 in space environment.
In order to restraining device 10 is installed to post element 31, each side rib 11 is provided with the multiple holes 111 for receiving fixing device, to be rigidly attached adjacent stiffener 12.Most preferably, restraining device 10 is screwed onto on post element 31 and (sees Fig. 5).The hole 111 of the adjacent rib 11 of stiffener 12 is aligned with each other, so that they can receive the screw 13 as fixing device, this fixing device fastens by means of nut 14.This measure makes restraining device 10 to install the most simply and reliably.Additionally, by restraining device 10 is screwed onto on post element 31, it is not necessary to other part is welded to column jecket 3.Some things is welded to column jecket 3 often include making column jecket 3 or the harm of some of part deformation, and causes these parts to use.Additionally, by using screw 13 and nut 14 so that close fit restraining device 10 can be carried out around the circumference of post element 31, be thus provided that the clamping action strengthened needed for post element 31.
Although close fit stiffener 12 is corresponding to increasing the wall thickness of post element 31, but the side rib extended in a radial direction 11 has change, particularly increases the additional effect of the rotary inertia of post element 31.Natural frequency of structures can be changed to higher value by the increase of rotary inertia.
The corresponding size of restraining device 10 or each depend on concrete application for producing the corresponding size of humidification and the stiffener 12 that increases rotary inertia, and about being used for accordingly being determined.
Determine that the suitable dimension of restraining device 10 and the method for optimizing of position are finite element analysis (FEA).This method known is particularly adapted to determine the natural frequency of structures of given structure.Thus, by FEA, the prototype structure natural frequency of vibration of vertical pump can be determined.Subsequently, FEA can be used for finding that what the suitable parameters of restraining device 10 size, this device result in natural frequency of structures is effectively improved and makes it away from critical value (such as the exploitation speed of pump 1), thus the resonance effects that suppression is harmful.
Certainly, also having other appropriate method for studying and determine natural frequency of structures, other analyzes method to known to it for such as based on simulation (or emulation) method or those skilled in the art.The empirical data of vertical pump, historical data or use general knowledge or technical know-how additionally, can be used alone, and bonding analysis method or simulation, in order to determine the applicable size of the design for restraining device 10.For finding the applicable size of restraining device 10 and/or position and changeable parameter includes: restraining device development length L in axial direction A, the axial length AL of stiffener 12, the thickness T of deep framing 12, rib 11 development length RL in radial directions, the quantity of side rib 11, the quantity of restraining device 10, the position of restraining device 10, that is to say, restraining device 10 is installed on which or which post element 31.
According to the present invention, it is also proposed that have the vertical pump 1 of at least one restraining device 10.Natural frequency of structures is changed over away from critical value by the pump 1 that restraining device 10 is applicable not only to exist, and is applicable to the vertical pump 1 of neotectonics.Fig. 6 shows the more schematic sectional view of the preferred embodiment of the vertical pump 1 according to the present invention.Identical reference in Fig. 6 is also used in Fig. 1 to Fig. 5, and these references have the implication identical with the most interpreted implication.
Including for carrying the vertical pump 1 of fluid (such as water): there is impeller 22(Fig. 6 not shown) and entrance 21(Fig. 6 not shown) pumping unit 2, and have outlet 41 exhaust unit 4.Driver element 5 is disposed on the top of exhaust unit 4.Column jecket 3 extends vertically, and is connected with exhaust unit 4 by pumping unit 2.Major axis 6 extends in column jecket 3, and is operably connected with the impeller 22 in pumping unit 2 by driver element 5.
Column jecket 3 includes multiple (being herein 4) post element 31, and post element 31 axially A is arranged in after another by one.
According to the present invention, at least one post element 31 of column jecket 3 is provided with restraining device 10 designed according to this invention.Restraining device 10 is around the whole circumference close fit of post element 31, and has the development length L in axial direction A, and this development length L is at least the half of the axial length C of post element 31.
In a preferred embodiment, as shown in Figure 6, four post elements 31 are each provided with corresponding restraining device 10.Each restraining device 10 is all designed according to the same way described in detail about Fig. 2 to Fig. 5 before.Each restraining device 10 be suitable for its around the axial length C of post element 31, that is to say, the development length L in axial direction A and the axial length AL of stiffener 12 of restraining device 10 and the axial length C of post element 31 are equal.As it was noted above, restraining device 10 is screwed onto on corresponding post element 31, restraining device 10 is thus made to be detachably connected to post element 31.Closely cooperate between restraining device 10 and corresponding post element 31, in order to the clamping action enhancing corresponding post element 31 is provided.
In the vertical pump 1 with the column jecket 3 including multiple post element 31, it is not required to arrange a restraining device 10 for each post element 31.Only one of which, two or other any amount of post element 31 can be provided with restraining device 10.Concrete vertical pump 1 and/or concrete application are depended in the selection of the quantity of post element 31 and concrete one or more post elements 31 of being provided with restraining device 10.The quantity being suitable for of one or more restraining devices 10 and position can be determined by FEA method or any other method described above.Situation about being also possible to is, the environment of the position that vertical pump runs, particularly space environment, need to be any limitation as by the quantity of the restraining device 10 to the column jecket 3 being installed to pump 1 and position.
Fig. 7 shows a kind of deformation of stiffener 12 with the diagram similar with Fig. 4.This deformation is illustrated by the sectional view being perpendicular in the cross section that axial direction A intercepts.This deformation of stiffener 12 by additional intermediate rib 15 thus different from the stiffener 12 shown in Fig. 4, this intermediate rib 15 extends in radial directions and is disposed on the mid portion 121 of stiffener 12 between two side ribs 11.This intermediate rib has development length RL in radial directions, and this length and side rib 11 development length in radial directions can be identical or different.About the intermediate rib 15 development length in axial direction A, it is preferred that this development length is identical with the development length of the correspondence of side rib 11.Preferably, the intermediate rib 15 development length in axial direction A is equal with the axial length AL of stiffener 12.Intermediate rib 15 is preferably fixed to stiffener 12 with welding manner.
Certainly, stiffener 12 may also set up more than one intermediate rib 15, and the stiffener 12 being provided with at least one intermediate rib 15 can be combined with the stiffener 12 not having intermediate rib 15.
Fig. 8 is the sectional view of the second embodiment of the restraining device 12 according to the present invention.The most only explain the difference with first embodiment.Similarly, the detailed description carried out about first embodiment is the most effective for the second embodiment shown in Fig. 8 in an identical manner.
Second embodiment of restraining device 10 designed to be used the single parts of the whole circumference close fit around post element 31.Restraining device 10 includes two substantially the same stiffeners 12, and each stiffener is designed to foregoing reinforcement member 12 as shown in Figure 4 the most in a similar manner.But, in a second embodiment, each stiffener 12 all includes a mid portion 121, and this mid portion 121 has in the cross section be perpendicular to axial direction A for semicircular cross section.Similar with first embodiment, the mid portion 121 of each stiffener 12 extends between two corresponding side ribs 11.Two stiffeners 12 are connected with each other in articulated manner.This is to be realized by the hinge 16 that two the adjacent side ribs 11 belonging to different stiffener 12 link together by arranging one.Thus, restraining device 10 can be moved to closed position from open position as shown in Figure 8, and two side ribs not connected by hinge 16 11 are interconnected with one another in a closed position.Side rib 11 is provided with the multiple holes 111 for receiving fixing device.Preferably, fixing device is screw and bolt.
In order to restraining device 10 being installed to not shown in post element 31(Fig. 8), restraining device 10 is taken to open position, is placed about post element 31, is subsequently moved to closed position.Then, not shown in screw 13(Fig. 8) through hole 111 and by not shown in nut 14(Fig. 8) fastening, so that restraining device 10 can be around the whole circumference of post element 31 by close fit.
As optional measure, receive, by may also set up hole 111 on two side ribs 11 that hinge 16 connects, the screw 13 fastened by nut 14.This measure can improve the clamping action of restraining device 10, and discharges the load at hinge 6.
According to a kind of deformation of the second embodiment, two stiffeners 12 are not connected by articulated manner, but the parts separated.Therefore, hinge 16 can save.Two stiffeners 12 disconnected from each other are then installed on post element 31 with the similar fashion described about first embodiment.
Certainly, there are other embodiments of the stiffener 12 can with varying number, these stiffeners 12 are complementary to one another to form tubular structure in assembled state, and the such as quantity of stiffener 12 can be three or be more than four.
Restraining device 10 according to the present invention is particularly useful for improving vertical pump 1.
According to the invention it is proposed that a kind of method improving vertical pump 1, the method comprises the following steps: provide the restraining device 10 being used for changing the natural frequency of structures of vertical pump 1, and described restraining device 10 designs according to the present invention；Select at least one in the post element 31 of column jecket 3, and by restraining device 10 to be installed to post element 31 in the way of the whole circumference close fit of post element 31.
The close fit of restraining device 10 accordingly provides and causes coupled columns component 31 or column jecket 3 to carry out the clamping action strengthened.
Additionally, when improving existing axial-flow pump, it is preferable that restraining device 10 includes multiple stiffener 12, and more preferably four stiffeners 12.Moreover it is preferred that the development length L that the axial length AL of stiffener 12 or restraining device 10 are in axial direction A is correspondingly equal with the axial length C of post element 31.Stiffener 12 arranges around post element 31 and is fixed to each other.It is screw 13 and nut 14 for stiffener 12 is fixed to each other and is fixed to the preferred means of post element 31.Thus, this method provides a kind of bolt matable scheme the simplest, safe and efficient to the resonance problem solving in vertical pump.
When the column jecket 3 of axial-flow pump 1 includes more than one post element 31, such as four or seven post elements, preferably select multiple post element 31, such as, select all of post element 31, each post element 31 to be provided with a single restraining device 10.
In order to select should to be provided with suitable one or more post elements 31 of restraining device 10 and determine suitably sized and design for single restraining device 10, analysis method, and preferably FEA method are preferably used.As herein above it has been mentioned that as, the concrete size of restraining device 10 and the determination of position can be based on additive methods, such as, based on simulation or those skilled in the art it is also known that other analyze methods.Determine additionally, be used as the empirical data of vertical pump, historical data or technical know-how for described.
The method according to the invention is both suitable for the resonance problem in the pump solving to have existed and be currently running, and is also suitable for avoiding resonance problem in the pump of coming of new.Especially from the viewpoint of improving existing axial-flow pump, it is advantageous that, it is not necessary to the redesign completely of vertical pump overcomes resonance problem.The invention provides the solution with very simple and effective design.This method is the most flexibly, therefore, it is possible to be applied to all vertical pumps 1 with column jecket 3.During the installation of restraining device 10 the most quickly and easily.It addition, without parts being welded to vertical pump 1.Therefore, relevant to welding deformation or other adverse effects are all avoided.
Additionally, the installation of restraining device 10 can be carried out at the scene of the position that vertical pump is operating.Because the method proposed includes very simple bolt matable solution, so need not necessarily taking whole vertical pump apart or taking the column jecket 3 of vertical pump 1 apart.This greatly reduces the expense for solving the resonance problem in vertical pump and required time.
In concrete example, at resonance problem due to exploitation speed closely this pump structure natural frequency of vibration of pump thus in the case of occurring in the vertical pump run, the method according to the invention successfully inhibits the original natural frequency of vibration by the natural frequency of vibration increases to the value of the present exploitation speed 15% away from vertical pump.
Claims (15)
1. a restraining device, described restraining device is for changing the natural frequency of structures of vertical pump, and described pump (1) including:
Pumping unit (2), described pumping unit (2) has entrance (21) and for carrying the impeller (22) of fluid；
Exhaust unit (4), described exhaust unit (4) has the outlet (41) for described fluid；
Driver element (5), described driver element (5) is used for rotating described impeller (22)；
At the upper column jecket (3) extended of axial direction (A), described column jecket (3) has at least one post element (31) with axial length (C), and described pumping unit (2) is connected by described column jecket (3) with described exhaust unit (4)；And
Major axis (6), described major axis (6) extends in described column jecket (3), and is operably connected with described pumping unit (2) by described driver element (5)；
Described restraining device (10) is designed to and is suitable to closely assemble around the whole circumference of described post element (31), the development length (L) that described restraining device (10) has on described axial direction (A) is at least the half of the axial length (C) of described post element (31), and described restraining device (10) also includes substantially being perpendicular at least one rib (11) extended in the radial direction of described axial direction (A).
Restraining device the most according to claim 1, it is characterized in that, development length (L) on described axial direction (A) is equal to the axial length (C) of described post element (31), and described restraining device (10) assembles around described post element (31) in assembled state.
3. according to restraining device in any one of the preceding claims wherein, it is characterized in that, also include multiple stiffener (12), described stiffener (12) along the circumferential direction bends and can be connected to each other and be complementary to one another in assembled state becomes tubular structure, closely assembles for the whole circumference around described post element (31).
Restraining device the most according to claim 3, it is characterized in that, each stiffener (12) have two at the described side rib (11) extended in the radial direction, each rib (11) forms the end relative to described circumferencial direction of described stiffener (12).
Restraining device the most according to claim 4, it is characterized in that, also include four stiffeners (12), each described stiffener (12) is respectively provided with the mid portion (121) of the cross section of quadrant shape, and described mid portion (121) extends between two described side ribs (11).
6. according to the restraining device described in claim 4 or 5, it is characterised in that each described side rib (11) is provided with the multiple holes (111) for receiving fixing device, to be rigidly attached adjacent stiffener (12).
7. according to described restraining device arbitrary in claim 4 to 6, it is characterized in that, at least one described stiffener (12) has at the described intermediate rib (15) extended in the radial direction, and described intermediate rib (15) is disposed between two described side ribs (11).
8. a vertical pump, described vertical pump is used for carrying fluid, and described vertical pump includes:
Pumping unit (2), described pumping unit (2) has entrance (21) and for carrying the impeller (22) of described fluid；
Exhaust unit (4), described exhaust unit (4) has the outlet (41) for described fluid；
Driver element (5), described driver element (5) is used for rotating described impeller (22)；
At the upper column jecket (3) extended of axial direction (A), described column jecket (3) includes that at least one has the post element (31) of axial length (C), and described pumping unit (2) is connected by described column jecket (3) with described exhaust unit (4)；And
Major axis (6), described major axis (6) extends in described column jecket (3), and is operably connected with described pumping unit (2) by described driver element (5)；
It is characterized in that,
At least one post element (31) of described column jecket (3) is provided with according to the restraining device (10) of design any one of aforementioned claim, described restraining device (10) closely assembles around the whole circumference of described post element (31), and the development length (L) that described restraining device (10) has on described axial direction (A) is at least the half of the axial length (C) of described post element (31).
Vertical pump the most according to claim 8, it is characterised in that described restraining device (10) is detachably connected to described post element (31).
Vertical pump the most according to claim 8 or claim 9, it is characterised in that the described restraining device (10) development length (L) on described axial direction (A) is equal to the axial length (C) of described post element (31).
11. according to Claim 8 to the vertical pump according to any one of 10, it is characterised in that described column jecket (3) includes multiple post element (31), and post element (31) described at least two of which is provided with corresponding restraining device (10).
12. 1 kinds of methods improving vertical pump, described vertical pump includes: have entrance (21) and for carrying the pumping unit (2) of the impeller (22) of fluid；There is the exhaust unit (4) of outlet (41) for described fluid；For rotating the driver element (5) of described impeller (22)；Including at least one, there is the post element (31) of axial length (L) and at the upper column jecket (3) extended of axial direction (A), described pumping unit (2) is connected with described exhaust unit (4) by described column jecket (3)；And major axis (6), described major axis (6) extends in described column jecket (3), and is operably connected with described pumping unit (2) by described driver element (5)；Said method comprising the steps of:
Thering is provided the restraining device (10) being used for changing the natural frequency of structures of described vertical pump, described restraining device (10) designs according to any one of claim 1 to 7；
Select at least one in described post element (31)；
In the way of the whole circumference around described post element (31) is closely fit with, described restraining device (10) is installed to described post element (31).
13. methods according to claim 12, it is characterised in that the development length (L) that described restraining device (10) is arranged on described axial direction is equal to the axial length (C) of described post element (31).
14. according to the method described in claim 12 or 13, it is characterized in that, described restraining device (10) includes multiple stiffener (12), preferably four stiffeners (12), wherein, described stiffener (12) is disposed in described post element (31) around, and described stiffener (12) is fixed to each other, in order to the whole circumference around described post element (31) closely assembles.
15. according to the method according to any one of claim 12 to 14, it is characterised in that multiple described post elements (31) are chosen, and are each provided with single restraining device (10) in selected post element (31).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201562117569P | 2015-02-18 | 2015-02-18 | |
| US62/117569 | 2015-02-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105889135A true CN105889135A (en) | 2016-08-24 |
Family
ID=54292738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610078695.4A Pending CN105889135A (en) | 2015-02-18 | 2016-02-04 | Suppressing device for a vertical pump, vertical pump and method for retrofitting a vertical pump |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20160238036A1 (en) |
| EP (1) | EP3059448A1 (en) |
| CN (1) | CN105889135A (en) |
| CA (1) | CA2917855A1 (en) |
| RU (1) | RU2016103240A (en) |
Cited By (4)
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| CN107044629A (en) * | 2017-03-24 | 2017-08-15 | 苏州热工研究院有限公司 | A kind of aspirator of container |
| CN110966205A (en) * | 2018-09-28 | 2020-04-07 | 株式会社日立产业机器 | Vertical shaft pump |
| CN112177983A (en) * | 2019-07-01 | 2021-01-05 | 苏尔寿管理有限公司 | Pump assembly with vertical pump arranged in tank |
| CN114922811A (en) * | 2021-11-30 | 2022-08-19 | 上海凯泉泵业（集团）有限公司 | Submersible electric pump and mounting method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| MX2019006541A (en) * | 2016-12-20 | 2019-08-01 | Sulzer Management Ag | Passive actuator for suppressing a vibration of a column pipe of a vertical pump, vertical pump and method of retrofitting a vertical pump. |
| RU2723919C1 (en) * | 2019-07-09 | 2020-06-19 | Публичное акционерное общество "Пролетарский завод" | Method of detuning from resonance system vertical electric pump unit-foundation-inlet and outlet pipelines |
| WO2022023807A1 (en) * | 2020-07-31 | 2022-02-03 | Bhattacharya Mantosh Isanchandra | A device to shift structural resonance in a vertical long shaft pump |
| CN114837934B (en) * | 2022-05-24 | 2024-01-23 | 湖州创感科技有限公司 | Water supply pump and solar high-temperature thermal power generation system using same |
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Also Published As
| Publication number | Publication date |
|---|---|
| CA2917855A1 (en) | 2016-08-18 |
| RU2016103240A (en) | 2017-08-03 |
| RU2016103240A3 (en) | 2019-05-31 |
| US20160238036A1 (en) | 2016-08-18 |
| EP3059448A1 (en) | 2016-08-24 |
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