CN2766067Y - Multiple-stage centrifugal pump capable of dynamically regulating and controlling axial force balanced by balance drum - Google Patents
Multiple-stage centrifugal pump capable of dynamically regulating and controlling axial force balanced by balance drum Download PDFInfo
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- CN2766067Y CN2766067Y CN 200520078349 CN200520078349U CN2766067Y CN 2766067 Y CN2766067 Y CN 2766067Y CN 200520078349 CN200520078349 CN 200520078349 CN 200520078349 U CN200520078349 U CN 200520078349U CN 2766067 Y CN2766067 Y CN 2766067Y
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- centrifugal pump
- pump
- multistage centrifugal
- balancing
- axial force
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Abstract
The utility model mainly relates to a structure of a multistage centrifugal pump for regulating and controlling the axial force of the multistage centrifugal pump, particularly a structure of a multistage centrifugal pump for regulating and controlling the axial force and balancing the axial force by balance drums when the axial force varies during running, and the multistage centrifugal pump is arranged in whole same directions of impellers. A multistage centrifugal pump which can regulate and balance the axial force by balance drums in a dynamic mode comprises a pump body. The rear part of a tail stage impeller of the multistage centrifugal pump which balances the axial force by the balance drums in a dynamic mode and is arranged in the whole same directions of the impellers is provided with a balance drum (4-2). A gap (4-3) exists between the balance drum (4-2) and the pump body, and the balance drum (4-2) is communicated with a balance cavity (4-4). The utility model has the advantages that the utility model comprises a regulating and controlling hole (4-8) arranged on the pump body in the range of the balance cavity (4-4); the regulating and controlling hole (4-8) and a suction chamber (4-9) of a suction section are communicated by a regulating and controlling device (3) through a reflux hole (4-11). The utility model has the advantages of simple structure and reasonable design. The utility model is suitable for multistage centrifugal pumps in structure forms such as a spiral casing form or a guide blade form or a horizontal form or a vertical form, etc.
Description
Technical field:
The utility model relates generally to regulates and control the multistage centrifugal pump structure to axial force in multi-stage centrifugal pump, relate in particular to the whole equidirectional installations of impeller with the multistage centrifugal pump of balancing drum balancing axial thrust in running when axial force changes to its multistage pump structure of regulating and control.
Background technique:
Axial force is one of principal element that influences the centrifugal pump mean lifetime.In the prior art, for single stage single suction volute pump, the method of balancing axial thrust is to establish seal ring (title increasing back sealing ring) and sealing ring scope is connected with suction port with interior pump chamber on back shroud of impeller, make the pressure basic neutralisation that is born on the forward and backward cover plate of impeller, residual axial force is born by thrust-bearing.Connection method has two kinds: a kind of is to open equalizing orifice in the increasing back sealing ring scope on interior back shroud of impeller, and another kind is with off-load pipe (return pipe) pump chamber in this scope to be connected with suction port.Generally about 10mm, off-load pipe diameter no longer changes its off-load pipe diameter after dispatching from the factory.Multistage centrifugal pump impeller number is at least more than two, tens even more at most.The method of balancing axial thrust has, and A. scroll casing type multistage centrifugal pump has the spirality pumping chamber, and housing is normally opened in the level, adopts impeller symmetric arrangement method to come balancing axial thrust, and residual axial force is born by thrust-bearing; B. to be called the utility model patent of " the multistage slag stock pump of the opposed scroll casing type of sections " disclosed be the multistage slag stock pump of sections scroll casing type to the ZL96217016.X of Shanxi Yangquan City Water Pump Factory name; C. the whole impellers of traditional segmental centrifugal pump are equidirectional to be installed on the pump shaft, and pumping chambers at different levels are stator formula radially, and it is one that stator is strained vertically with turnbuckle.This pump adopts Balance disc or the balancing drum (claiming the off-load dish again) behind the impeller to come balancing axial thrust for a long time always; D. inventor's patent of invention of being called " multistage sectional centrifugal pump of impeller symmetric arrangement " in the ZL02114680.2 name discloses a kind of single suction multistage segmental centrifugal pump, and impeller distributes and is the near symmetrical state, and residual axial force is born by thrust-bearing.The multistage centrifugal pump of above-mentioned various structural types no matter be scroll casing type or stator formula radially, general two classes of dividing of the method for its balancing axial thrust: a class is that the method with symmetric arrangement makes whole pump axial force in a basic balance, bears residual axial force by thrust-bearing; Another kind of is the equidirectional installations of whole impellers, makes the axial force of whole pump reach transient equiliblium with Balance disc, perhaps use the equilibrant of balancing drum (off-load dish) and the axial force of whole pump to reach in a basic balance, and residual axial force is still born by thrust-bearing.The axial force of said pump adjusted before dispatching from the factory is good, no longer regulates and control the work of axial force in running.
But, pump is at run duration, because multistage centrifugal pump often uses under mine or in the open-air field irrigation, the running environment condition is relatively poor, often contain a certain amount of solid particle in the liquid that is pumped, the speed of wearing and tearing is sharply accelerated with the increasing of impurity content and granularity in the pump, and the phase of overhaul first (more than 8000 hours) that causes a large amount of pumps not reach the industry standard regulation far away just damages, the pump that has even can only use hundreds of hours.To the maintenance of disintegrating often of this method that solves in the sector, even renew pump in addition.Unplanned property shutdown phenomenon takes place repeatedly, has had a strong impact on ordinary production.
The inventor is according to for many years observation and research, discovery is along with the prolongation of pump operation time, seal clearance all can strengthen gradually because of wearing and tearing before and after the single suction impeller, the increasing of preceding seal clearance makes pressure distribution that front shroud of impeller bears reduce, the increasing of back seal clearance makes pressure distribution that back shroud of impeller bears raise, and the two causes that all axial force increases so that cause the damage of thrust-bearing along the direction of pointing to single suction impeller water inlet oral-lateral.The traditional single stage single-suction centrifugal pump increases axial force in the said pump running does not have concrete counter-measure, is that this axial force increments of change is less, and pace of change is slower, and the harm that shows is very not serious.And in the actual moving process of multistage pump, all seal clearances all can strengthen gradually because of wearing and tearing, the wearing and tearing of each seal clearance all can cause the outer pressure distribution of two cover plates of every grade of impeller to change, the axial force that every grade of impeller bears is along with increment appears in running, and this axial force incremental raio of most impellers single-stage pump situation is also much bigger in the multistage centrifugal pump.The increment superposition of the axial force that the whole impeller of multistage pump is born shows as the axial force increment that occurs in whole the multistage pump running together.This increment has been compared three distinguishing features with the single-stage pump situation: the one, value is big, the 2nd, change fast, the 3rd, direction and size can be with symmetric arrangement whether with the concrete mode of symmetric arrangement and different.This tends to cause the actual axial force value of whole multistage pump to exceed the axial force excursion of design code, and causes the damage of multistage centrifugal pump.Also be multistage centrifugal pump rate of fault the most basic, the most important reason much higher in the engineering practice far beyond the single stage centrifugal pump rate of fault.The fact is in the prior art, and multistage centrifugal pump is more much higher than the rate of fault that single stage centrifugal pump causes because of axial force is excessive.In a word, the axial force increment that occurs in the running is multistage centrifugal pump causes various faults because of axial force is an excessive root.
The model utility content:
The multistage centrifugal pump of a kind of dynamic regulation with the balancing drum balancing axial thrust but being to avoid the deficiencies in the prior art part, the purpose of this utility model is provided.
The purpose of this utility model can be by realizing by the following technical solutions: but a kind of dynamic regulation is with the multistage centrifugal pump of balancing drum balancing axial thrust, include the pump housing, in the whole equidirectional installations of impeller, rear portion with the multistage centrifugal pump impeller of balancing drum balancing axial thrust is provided with balancing drum (4-2), between the balancing drum (4-2) and the pump housing gapped (4-3), and be communicated with counter balance pocket (4-4), its main feature characteristics are to be provided with regulation and control hole (4-8) on the pump housing that includes in the scope of counter balance pocket (4-4), will regulate and control hole (4-8) with regulating controller (3) and be connected by return port (4-9) with the suction chamber (4-10) of suction side.
But described dynamic regulation is the 1/4-3/4 in multistage centrifugal pump pumping hole footpath with the multistage centrifugal pump of balancing drum balancing axial thrust, the diameter that also includes described regulation and control hole (4-8) and return port (4-9).
But the multistage centrifugal pump of dynamic regulation axial force described in the utility model also includes on the anti-drive end rear bearings body (4-5) of centrifugal pump shaft and is provided with pump axial force testing apparatus (5).On pump axial force testing apparatus (5), be provided with the axial force display list.
Described pump axial force testing apparatus (5) is provided with bearing (5-2) at the anti-drive end rear bearings body (4-5) of centrifugal pump shaft, the outer ring of bearing (5-2) is provided with bearing box (5-3), and feather key (5-4) is located between bearing support (4-5) and the bearing box (5-3); Bearing support end cap (5-14) is connected with bearing support (4-5), and its stud end is provided with the shearing force transducer (5-12) that posts foil gauge on spoke; Bearing box gland (5-5) is pressed on bearing (5-2) in the bearing box (5-3) vertically, and its center is fixed with tappet (5-6), passes bearing support end cap (5-14) and is connected with the shearing force transducer of spoke (5-12).In the stud end of bearing support end cap (5-14) and posting on the spoke between the shearing force transducer (5-12) of foil gauge and also be provided with the shearing force transducer (5-15) that on spoke, posts foil gauge equally.
Regulating controller of the present utility model (3), include connecting tube (3-3,3-6), its two ends are provided with and joining entrance point pipe joint of the pump housing (3-4) and outlet end pipe joint (3-5), it is characterized in that also being included in connecting tube (3-3,3-6) and are provided with throttle mechanism (3-1).Described regulating controller (3) also can be provided with mechanism for monitoring pressure gauge (3-2) differential pressure meter (3-2 ') on connecting tube (3-3,3-6).
But described dynamic regulation is with the regulating controller (3) of the multistage centrifugal pump of balancing drum balancing axial thrust, and the caliber of (3-3,3-6) is the 1/4-3/4 in multistage pump pumping hole footpath also to include connecting tube.
The utility model throttle mechanism (3-1) is provided with the restrictor ring (3-9) in two different mesopores apertures at least for be provided with flange plate (3-7,3-8) on connecting tube (3-3,3-6) between two dishes.
Described throttle mechanism (3-1) is throttle valve or is the electric throttling valve.
The beneficial effects of the utility model are:
1. simple in structure, reasonable in design.
2. the axial force increment that occurs in coming pump operation of the actuator that adjusts regulating controller by the user of pump in the pump operation process carries out timely and appropriate opposite direction and compensates for, and whether the reverse setoff work of directly or indirectly being monitored actuator by the mechanism for monitoring of regulating controller is appropriately reasonable.Saving of work and time, convenient and swift, can prevent unplanned property shutdown phenomenon, thereby multistage centrifugal pump Mean Time Between Failures and average life are greatly prolonged that the reliability index of pump is doubled and redoubled, and makes its regulation of industry standard head and shoulders above.Owing to flexible and suitable adjustment etc. that total progression, impeller arrangement and other flow passage components of pump are made comparisons, the efficient of multistage centrifugal pump is increased simultaneously.
3. the mechanism for monitoring of the actuator of regulating controller and the regulating controller position very obviously and easily, outside that is installed in the pump housing is convenient to the axial force in multi-stage centrifugal pump increment is carried out timely and appropriate setoff.
4. be applicable to scroll casing type or stator formula, the multistage centrifugal pump of structural type such as horizontal or vertical.
Description of drawings:
Be described in further detail below in conjunction with the most preferred embodiment shown in the accompanying drawing:
Fig. 1 looks schematic representation for master of the present utility model.
Fig. 2 looks schematic representation for pump axial force testing apparatus master of the present utility model.
Fig. 3 is regulating controller embodiment's 1 an of the present utility model plan view.
Fig. 4 is regulating controller embodiment's 2 an of the present utility model plan view.
Embodiment:
See Fig. 1, but the dynamic regulation multistage centrifugal pump of balancing drum balancing axial thrust, the pump housing is arranged, in the whole equidirectional installations of impeller, rear portion with the multistage centrifugal pump impeller of balancing drum balancing axial thrust is provided with balancing drum 4-2, gapped 4-3 between the balancing drum 4-2 and the pump housing, and be communicated with counter balance pocket 4-4, be provided with regulation and control hole 4-8 on the pump housing in the scope of counter balance pocket 4-4, will regulate and control hole 4-8 with regulating controller 3 and be connected by return port 4-9 with the suction chamber 4-10 of suction side.The diameter of regulation and control hole 4-8 and return port 4-9 is 1/2 of multistage centrifugal pump pumping hole footpath.On the anti-drive end rear bearings body 4-5 of centrifugal pump shaft, be provided with pump axial force testing apparatus 5.On pump axial force testing apparatus 5, be provided with the axial force display list.
See Fig. 2, pump axial force testing apparatus 5 is provided with bearing 5-2 at the anti-drive end rear bearings body 4-5 of centrifugal pump shaft, and the outer ring of bearing 5-2 is provided with bearing box 5-3, and feather key 5-4 is located between bearing support 4-5 and the bearing box 5-3; Bearing support end cap 5-14 and bearing support 4-5 are connected, and its stud end is provided with the shearing force transducer 5-12 that posts foil gauge on spoke; Bearing box gland 5-5 is pressed on bearing 5-2 in the bearing box 5-3 vertically, and its center is fixed with tappet 5-6, passes the shearing force transducer 5-12 of bearing support end cap 5-14 and spoke and is connected.In the stud end of bearing support end cap 5-14 and posting on the spoke between the shearing force transducer 5-12 of foil gauge and also be provided with the shearing force transducer 5-15 that on spoke, posts foil gauge equally.
Regulating controller embodiment 1: see Fig. 3, connecting tube 3-3,3-6 are arranged, its two ends are provided with and the pump housing joining entrance point pipe joint 3-4 and outlet end pipe joint 3-5, are provided with throttle mechanism 3-1 on connecting tube 3-3,3-6.On connecting tube 3-3,3-6, also be provided with mechanism for monitoring pressure gauge 3-2.The caliber of connecting tube 3-3,3-6 is 1/2 of multistage pump pumping hole footpath.Throttle mechanism 3-1 is provided with the restrictor ring 3-9 in six different mesopores apertures for be provided with flange plate 3-7,3-8 on connecting tube 3-3,3-6 between two dishes.
Regulating controller embodiment 2: see Fig. 4, throttle mechanism 3-1 is throttle valve or is the electric throttling valve.All the other structures are identical with last example.
During operation, this pump is when calculated equilibrium drum external diameter, and there is bigger pressure difference at regulating controller throttle orifice two ends when fully taking into account beginning, promptly among the throttle mechanism 3-1 bigger hydraulic loss are arranged.The throttling sheet 3-9 of throttle orifice aperture minimum is installed when pumping factory for whole, the axial force that this aperture can make whole multistage pump is-F
m,-F
mThe thrust-bearing of selecting for use when absolute value equals to design allows to bear the maximum value of axial force, and is shown by axial force testing apparatus 5.Along with the wearing and tearing of various seal clearances in the pump operation process, axial force is by-F
mBegin to gradually become zero and then become F
mWhen axial force testing apparatus 5 shows F
mThe time, the throttling sheet 3-9 of throttle orifice aperture minimum is replaced by the bigger throttling sheet 3-9 in throttle orifice aperture, also can make axial force testing apparatus 5 show the maximum negative sense axial force-F that allows the throttling hole drill ambassador's of the throttling sheet 3-9 of throttle orifice aperture minimum the bigger throttling sheet 3-9 that becomes
m, the continuation along with pump moves then, the further wearing and tearing of various seal clearances in the pump, and the variation of axial force can repeat above-mentioned " F
m--null value--F
m" change procedure.When axial force testing apparatus 5 shows F once more
mThe time, be changed to the bigger throttling sheet 3-9 in aperture again, be provided with the axial force display list up to axial force testing apparatus 5 and show indicated value F no change or variation at below 10% of F value, can not be again with till the method adjustment axial force that strengthens throttle orifice.At this moment each seal clearance has worn and torn excessively in the pump, and the volumetric efficiency of pump obviously descends, thereby the Economy of moving obviously descends, must be to the maintenance of disintegrating of this multistage pump.
When the anti-drive end of pump is installed main mechanism for monitoring pump axial force testing apparatus 5, also can keep pressure gauge 3-2 differential pressure meter 3-2 ' as less important mechanism for monitoring, directly change to the pressure difference at throttle pipe two ends and level off to zero the time, change in Sealing and the pump and repeat above-mentioned steps behind other flow passage components that worn and torn, multistage centrifugal pump resumes operation.
Claims (10)
1. but a dynamic regulation is with the multistage centrifugal pump of balancing drum balancing axial thrust, include the pump housing, in the whole equidirectional installations of impeller, rear portion with the multistage centrifugal pump impeller of balancing drum balancing axial thrust is provided with balancing drum (4-2), between the balancing drum (4-2) and the pump housing gapped (4-3), and be communicated with counter balance pocket (4-4), it is characterized in that including be provided with on the pump housing in the scope of counter balance pocket (4-4) regulation and control hole (4-8), will regulate and control hole (4-8) with regulating controller (3) and be connected by return port (4-9) with the suction chamber (4-10) of suction side.
2. but the dynamic regulation as claimed in claim 1 multistage centrifugal pump of balancing drum balancing axial thrust, its feature also includes on the anti-drive end rear bearings body (4-5) of centrifugal pump shaft and is provided with pump axial force testing apparatus (5).
3. but dynamic regulation as claimed in claim 1 or 2 is with the multistage centrifugal pump of balancing drum balancing axial thrust, and the diameter that it is characterized in that also including described regulation and control hole (4-8) and return port (4-9) is multistage centrifugal pump pumping hole 1/4-3/4 directly.
4. but the dynamic regulation as claimed in claim 2 multistage centrifugal pump of balancing drum balancing axial thrust, its feature also includes described pump axial force testing apparatus (5) and is provided with bearing (5-2) at the anti-drive end rear bearings body (4-5) of centrifugal pump shaft, the outer ring of bearing (5-2) is provided with bearing box (5-3), and feather key (5-4) is located between bearing support (4-5) and the bearing box (5-3); Bearing support end cap (5-14) is connected with bearing support (4-5), and its stud end is provided with the shearing force transducer (5-12) that posts foil gauge on spoke; Bearing box gland (5-5) is pressed on bearing (5-2) in the bearing box (5-3) vertically, and its center is fixed with tappet (5-6), passes bearing support end cap (5-14) and is connected with the shearing force transducer of spoke (5-12).
5. but dynamic regulation as claimed in claim 3 is with the multistage centrifugal pump of balancing drum balancing axial thrust, and its feature also includes described pump axial force testing apparatus (5) and be provided with the same shearing force transducer (5-15) that posts foil gauge on spoke between the stud end of bearing support end cap (5-14) and the shearing force transducer (5-12) that is posting foil gauge on the spoke.
6. but the dynamic regulation as claimed in claim 1 multistage centrifugal pump of balancing drum balancing axial thrust, it is characterized in that described regulating controller (3), include connecting tube (3-3,3-6), its two ends are provided with and joining entrance point pipe joint of the pump housing (3-4) and outlet end pipe joint (3-5), are provided with throttle mechanism (3-1) on connecting tube (3-3,3-6).
7. but dynamic regulation as claimed in claim 6 is with the multistage centrifugal pump of balancing drum balancing axial thrust, it is characterized in that described regulating controller (3) also includes to be provided with mechanism for monitoring pressure gauge (3-2) differential pressure meter (3-2 ') on connecting tube (3-3,3-6).
8. but as claim 6 or the 7 described dynamic regulations multistage centrifugal pump with the balancing drum balancing axial thrusts, the caliber of (3-3,3-6) is the 1/4-3/4 in multistage pump pumping hole footpath to it is characterized in that also including connecting tube.
9. but the dynamic regulation as claimed in claim 8 multistage centrifugal pump of balancing drum balancing axial thrust, it is characterized in that also comprising that described throttle mechanism (3-1) for be provided with flange plate (3-7,3-8) on connecting tube (3-3,3-6), is provided with the restrictor ring (3-9) in two different mesopores apertures at least between two dishes.
10. but dynamic regulation as claimed in claim 9 is characterized in that also comprising that with the multistage centrifugal pump of balancing drum balancing axial thrust described throttle mechanism (3-1) is throttle valve or is the electric throttling valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520078349 CN2766067Y (en) | 2005-01-30 | 2005-01-30 | Multiple-stage centrifugal pump capable of dynamically regulating and controlling axial force balanced by balance drum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520078349 CN2766067Y (en) | 2005-01-30 | 2005-01-30 | Multiple-stage centrifugal pump capable of dynamically regulating and controlling axial force balanced by balance drum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2766067Y true CN2766067Y (en) | 2006-03-22 |
Family
ID=36606731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520078349 Expired - Fee Related CN2766067Y (en) | 2005-01-30 | 2005-01-30 | Multiple-stage centrifugal pump capable of dynamically regulating and controlling axial force balanced by balance drum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2766067Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018209011A1 (en) * | 2017-05-10 | 2018-11-15 | Itt Manufacturing Enterprises Llc | Multi-stage pump with enhanced thrust balancing features |
-
2005
- 2005-01-30 CN CN 200520078349 patent/CN2766067Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018209011A1 (en) * | 2017-05-10 | 2018-11-15 | Itt Manufacturing Enterprises Llc | Multi-stage pump with enhanced thrust balancing features |
| US10690139B2 (en) | 2017-05-10 | 2020-06-23 | Itt Manufacturing Enterprises Llc | Multi-stage pump with enhanced thrust balancing features |
| RU2769329C2 (en) * | 2017-05-10 | 2022-03-30 | Ай Ти Ти Мэньюфэкчуринг Энтерпрайзиз Ллк | Multistage pump with improved head balancing properties |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060322 Termination date: 20120130 |