CN109209897A - Multistage centrifugal pump rotor axial force balance mechanism - Google Patents
Multistage centrifugal pump rotor axial force balance mechanism Download PDFInfo
- Publication number
- CN109209897A CN109209897A CN201811311051.0A CN201811311051A CN109209897A CN 109209897 A CN109209897 A CN 109209897A CN 201811311051 A CN201811311051 A CN 201811311051A CN 109209897 A CN109209897 A CN 109209897A
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- CN
- China
- Prior art keywords
- centrifugal pump
- axial force
- inducer
- impeller
- stage impeller
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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
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage 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
- F04D29/40—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
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The object of the present invention is to provide can reduce energy loss and the simple Multistage centrifugal pump rotor axial force balance mechanism of structure, the inducer of first stage impeller and centrifugal pump including centrifugal pump, the first radial clearance C1 being sequentially communicated is provided between the front shroud and inducer of first stage impeller, first axis clearance C 2 and the second axial gap C3, the liquid outlet of first radial clearance C1 and the inlet communication of centrifugal pump, second axial gap C3 is connected to the liquid outlet of first stage impeller, inducer is provided with high pressure liquid stream introduction passage, high pressure liquid stream introduces introduction passage from the back shroud of centrifugal pump impeller and constitutes current return circuit, throttle orifice is provided in introduction passage.Since the introducing of high pressure liquid stream can generate an axial force by front end rear end, this axial force and impeller are influenced the axial force balance by rear end forward end generated by waterpower, compared with traditional multi-stage pump axial force balance mechanism, simplify structure, the recycling for realizing partial equilibrium liquid stream reduces leakage loss.
Description
Technical field
The invention belongs to Centrifugal Pump Design manufacturing fields, and in particular to a kind of Multistage centrifugal pump rotor axial force balance machine
Structure.
Background technique
When being centrifuged pump operation, be rotated in generation water pressure, objective due to suction eye at forward and backward cover board of impeller are deposited
So that back shroud of impeller is greater than the active area of front shroud by the active area of waterpower, so acting on forward and backward cover board
Power cannot mutually balance each other, therefore the power of an axial direction can be generated, the direction of this axial force is the back shroud by impeller always
It is directed toward front shroud.For being collectively aligned the multistage segmental centrifugal pump of impeller, each impeller generates that size is essentially identical, direction
Consistent axial force, the resultant force of these axial forces be very it is big (such as in desalination plant, production water scale be 5000m3/d~
The axial force that the multistage centrifugal centrifugal pump impeller of 20000m3/d generates is about 40kN~100kN).So in centrifugal multistage pump multiple centrifugal pump
There must be axial force balance mechanism, balance mechanism generates a reversed axial force to balance the axial force of impeller generation.
Traditional axial force balancing method is that the axial force in such a way that balancing frame adds balancing drum to balance impeller (also has
It is individually balanced using balancing frame, is the special case that balancing drum does not generate equilibrant force).The course of work of balancing device is exactly
Liquid stream with high pressure energy is reduced to the process of the liquid stream of low pressure energy, but this process will lead to the loss of energy, this energy
Amount loss is exactly to pump volumetric loss described in industry.
Summary of the invention
Energy loss can be reduced the object of the present invention is to provide one kind and the simple Multistage centrifugal pump rotor of structure is axial
Dynamic balance mechanism.
To achieve the goals above, a kind of the technical solution adopted by the present invention are as follows: Multistage centrifugal pump rotor axial force balance
Mechanism, the inducer of first stage impeller and centrifugal pump including centrifugal pump are provided between the front shroud and inducer of first stage impeller
The first radial clearance C1, first axis clearance C 2 and the second the axial gap C3's, the first radial clearance C1 being sequentially communicated goes out liquid
The inlet communication of mouth and centrifugal pump, the liquid outlet of the second axial gap C3 are connected to the liquid outlet of first stage impeller, inducer setting
There is high pressure liquid stream introduction passage, high pressure liquid stream, which introduces introduction passage from the back shroud of centrifugal pump impeller and constitutes reflux, leads to
Road is provided with throttle orifice in introduction passage.
In above scheme, since the introducing of high pressure liquid stream can generate an axial force by front end rear end, this axial direction
Power and impeller influenced by waterpower the axial force balance by rear end forward end generated, this structure and traditional multiple stage pump shaft to
Dynamic balance mechanism is compared, and structure is simplified, and realizes the recycling of partial equilibrium liquid stream, reduces leakage loss.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention;
Fig. 2 is enlarged schematic partial view in Fig. 1.
Specific embodiment
As shown in Figure 1 and Figure 2, a kind of Multistage centrifugal pump rotor axial force balance mechanism, the first stage impeller 10 including centrifugal pump
With the inducer 20 of centrifugal pump, it is provided between the first radial direction being sequentially communicated between the front shroud and inducer 20 of first stage impeller 10
Gap C1, first axis clearance C 2 and the second axial gap C3, the liquid outlet of the first radial clearance C1 and the inlet communication of centrifugal pump,
The liquid outlet of second axial gap C3 is connected to the liquid outlet of first stage impeller 10, and inducer 20 is provided with high pressure liquid stream introduction passage
22, high pressure liquid stream, which introduces introduction passage 22 from (not shown) at the back shroud of centrifugal pump impeller and constitutes reflux, leads to
Road is provided with throttle orifice 21 in introduction passage 22.
Centrifugal pump inlet flow direction shown in FIG. 1 is right-to-left, due to the left side back shroud of centrifugal pump impellers at different levels
Compression area is bigger than right side front shroud, can generate the unbalanced axial force of waterpower on impeller when being centrifuged pump operation, direction is to the right.It is false
If the resultant force for the axial force that impellers at different levels generate is F1, i.e., the active force to the right that entire rotor is subject to is F1.The present invention be by
Stressed member of the front shroud of the first stage impeller 10 of centrifugal pump as equilibrant force, high pressure liquid stream from high pressure liquid stream introduction passage 22 into
Enter, entire balance mechanism generates a biggish equilibrant force to the left, it is assumed that this active force is F2.Centrifugal pump operates normally
When, F2 should be equal to F1, just can guarantee 30 axial force balance of rotor;Since Working Conditions of Centrifugal Injection Pumps often changes, F2, F1 are sent out
Changing, at this point, rotor is moved to the left, in the process first axis clearance C 2 and the second axial gap C3 if F2 is greater than F1
Become larger, the first radial clearance C1 it is constant, the high pressure liquid stream flow of introducing increases, due to being provided with throttling in introduction passage 22
Hole 21, so that the pressure difference between the forward and backward cover board of first stage impeller 10 reduces, F2 also reduces therewith;When F2 is less than F1, rotor is to the right
It is mobile, in the process first axis clearance C 2 and the second axial gap C3 gradually become smaller, the first radial clearance C1 it is constant, introduce
High pressure liquid stream flow reduce, due to being provided with throttle orifice 21 in introduction passage 22, so that between the forward and backward cover board of first stage impeller 10
Pressure difference become larger, F2 is also increased with it;And so on, axial force suffered by centrifugal pump rotor just reaches dynamic equilibrium, thus real
Show centrifugal pump rotor to operate near some equilbrium position.In above process, pass through first axis clearance C 2 and first
The balancing device liquid stream of radial clearance C1 therefore can reduce the leakage rate of centrifugal pump instead of the leakage of first stage impeller;Pass through
The balancing device liquid stream of second axial gap C3 enters first stage impeller outlet mainstream, realizes the recycling of partially liq energy.
Preferably, be provided on the inner wall of inducer 20 with 30 coaxial inner conductor of rotor arrangement sleeve 40, sleeve 40 it is interior
The first radial clearance C1, the end of sleeve 40 are constituted between the choma 11 being arranged on the front shroud of wall and first stage impeller 10
The first axis clearance C 2, inducer are constituted between the inner gimbal ring 12 being arranged on the front shroud of face and first stage impeller 10
The second axial gap C3 is constituted between the outer gimbal ring 13 being arranged on 20 end face and the front shroud of first stage impeller 10.
Further, the chamber between the first and second axial gap C2, C3 constitutes chamber A, the throttling being arranged on inducer 20
21 connecting chamber A of hole and high pressure liquid stream introduction passage 22.
The high pressure liquid stream total flow Q of introducing is divided into two-way: liquid stream (flow Q1) is along the second variable axial gap C3 all the way
Into the exit of first stage impeller 10, converged with the outlet mainstream of the first stage impeller of pump;Another way liquid stream (flow Q2) is along variable
First axis clearance C 2 and the first constant radial clearance C1 enter pump inlet, with pump water inlet mainstream converge.Due to chopped-off head leaf
The active area that 10 back shrouds are greater than front shroud by the active area of waterpower is taken turns, so centrifugal pump can produce on impeller at runtime
The unbalanced axial force of unboiled water power, from the front to the back, i.e., entire rotor is generated displacement backward by active force backward in direction,
So that first axis clearance C 2 and the second axial gap C3 become larger, the flow Q1 of first stage impeller is entered by the second axial gap C3
It significantly increases, although first axis clearance C 2 increases, since the first radial clearance C1 is fixed and invariable, plays throttling always
Effect, so the increase of Q2 is limited;Dramatically increasing for Q1 and being increased slightly for Q2, so that liquid stream total flow Q is dramatically increased,
At this moment due to being provided with throttle orifice 21 in inducer liquid stream introduction passage 22, so that the pressure P1's of chamber A is greatly lowered,
Equilibrant force also greatly reduces therewith, and rotor will move forward.In this way, rotor 30 certainly exists some equilbrium position, impeller
The axial force of generation is equal with equilibrant force, to realize the autobalance of axial force.
The present invention has fully phased out traditional balancing frame, balancing drum, enormously simplifies in structure;Part liquid stream passes through second
Axial gap C3 enters the exit of first stage impeller 10, forms the flow of centrifugal pump, realizes partial equilibrium leakage liquid stream
Energy regenerating;Partial discharge enters the suction inlet of centrifugal pump, this portion by the first radial clearance C1, first axis clearance C 2
Liquid separation stream improves the volumetric efficiency of first stage impeller 10, reduces energy instead of the leakage flow at conventional impellers choma
Loss, the fully effective leakage rate that traditional structure axial thrust balancing devices are utilized.
Claims (3)
1. a kind of Multistage centrifugal pump rotor axial force balance mechanism, it is characterised in that: first stage impeller (10) including centrifugal pump and
The inducer (20) of centrifugal pump is provided with the first diameter being sequentially communicated between the front shroud and inducer (20) of first stage impeller (10)
To clearance C 1, first axis clearance C 2 and the second axial gap C3, the import of the liquid outlet and centrifugal pump of the first radial clearance C1
Connection, the liquid outlet of the second axial gap C3 are connected to the liquid outlet of first stage impeller (10), and inducer (20) is provided with high pressure liquid
It flows introduction passage (22), high pressure liquid stream, which introduces introduction passage (22) from the back shroud of centrifugal pump impeller and constitutes reflux, leads to
Road is provided with throttle orifice (21) in introduction passage (22).
2. Multistage centrifugal pump rotor axial force balance mechanism according to claim 1, it is characterised in that: inducer (20)
The sleeve (40) with rotor (30) coaxial inner conductor arrangement is provided on inner wall, before the inner wall of sleeve (40) and first stage impeller (10)
The first radial clearance C1, the end face of sleeve (40) and first stage impeller are constituted between the choma (11) being arranged on cover board
(10) the first axis clearance C 2, the end of inducer (20) are constituted between the inner gimbal ring (12) being arranged on front shroud
The second axial gap C3 is constituted between the outer gimbal ring (13) being arranged on the front shroud of face and first stage impeller (10).
3. Multistage centrifugal pump rotor axial force balance mechanism according to claim 1, it is characterised in that: first and second is axial
Chamber between clearance C 2, C3 constitutes chamber A, throttle orifice (21) the connecting chamber A being arranged on inducer (20) and high pressure liquid stream
Introduction passage (22).
Priority Applications (1)
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CN201811311051.0A CN109209897B (en) | 2018-11-06 | 2018-11-06 | Axial force balancing mechanism of multistage centrifugal pump rotor |
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CN201811311051.0A CN109209897B (en) | 2018-11-06 | 2018-11-06 | Axial force balancing mechanism of multistage centrifugal pump rotor |
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CN109209897A true CN109209897A (en) | 2019-01-15 |
CN109209897B CN109209897B (en) | 2020-09-15 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110410354A (en) * | 2019-09-04 | 2019-11-05 | 上海中韩杜科泵业制造有限公司 | A kind of water pump axial force self-balancing device |
CN115182881A (en) * | 2022-07-28 | 2022-10-14 | 北京昌佳泵业有限公司 | Middle-open multi-stage centrifugal pump |
CN115182881B (en) * | 2022-07-28 | 2024-05-31 | 北京昌佳泵业有限公司 | Split multi-stage centrifugal pump |
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GB803871A (en) * | 1956-03-16 | 1958-11-05 | Gwynnes Pumps Ltd | Improvements relating to seals between rotating and stationary parts of pumps |
DE2447758A1 (en) * | 1974-10-07 | 1976-04-15 | Klein Schanzlin & Becker Ag | Self regulating balancing system for centrifugal pumps - consists of automatically controlled orifices on both sides of impeller |
SU605044A1 (en) * | 1976-01-08 | 1978-04-30 | Предприятие П/Я А-7755 | Centrifugal pump |
CN101149066A (en) * | 2007-09-07 | 2008-03-26 | 济南东方天明机械有限公司 | Centrifugal type slurry pump impeller adjusting gap scouring and erosion-reducing technology and apparatus |
CN103486087A (en) * | 2013-09-15 | 2014-01-01 | 丹东克隆先锋泵业有限公司 | Axial force balancing magnetic pump |
CN107013472A (en) * | 2017-04-18 | 2017-08-04 | 江苏大学 | It is a kind of to measure the method that pump chamber size influences on centrifugal pump external characteristics and axial force |
CN107084156A (en) * | 2017-06-14 | 2017-08-22 | 湖南山水泵业有限公司 | Centrifugal pump and its balance control method |
CN107676270A (en) * | 2017-11-08 | 2018-02-09 | 铜陵市宏达家电有限责任公司 | A kind of apron plate backwashes Pulp pump |
CN207122435U (en) * | 2017-06-27 | 2018-03-20 | 江苏巨浪泵阀有限公司 | A kind of centrifugal pump with equilibrium centrifugation pump axial force mechanism |
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2018
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Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
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GB803871A (en) * | 1956-03-16 | 1958-11-05 | Gwynnes Pumps Ltd | Improvements relating to seals between rotating and stationary parts of pumps |
DE2447758A1 (en) * | 1974-10-07 | 1976-04-15 | Klein Schanzlin & Becker Ag | Self regulating balancing system for centrifugal pumps - consists of automatically controlled orifices on both sides of impeller |
SU605044A1 (en) * | 1976-01-08 | 1978-04-30 | Предприятие П/Я А-7755 | Centrifugal pump |
CN101149066A (en) * | 2007-09-07 | 2008-03-26 | 济南东方天明机械有限公司 | Centrifugal type slurry pump impeller adjusting gap scouring and erosion-reducing technology and apparatus |
CN103486087A (en) * | 2013-09-15 | 2014-01-01 | 丹东克隆先锋泵业有限公司 | Axial force balancing magnetic pump |
CN107013472A (en) * | 2017-04-18 | 2017-08-04 | 江苏大学 | It is a kind of to measure the method that pump chamber size influences on centrifugal pump external characteristics and axial force |
CN107084156A (en) * | 2017-06-14 | 2017-08-22 | 湖南山水泵业有限公司 | Centrifugal pump and its balance control method |
CN207122435U (en) * | 2017-06-27 | 2018-03-20 | 江苏巨浪泵阀有限公司 | A kind of centrifugal pump with equilibrium centrifugation pump axial force mechanism |
CN107676270A (en) * | 2017-11-08 | 2018-02-09 | 铜陵市宏达家电有限责任公司 | A kind of apron plate backwashes Pulp pump |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110410354A (en) * | 2019-09-04 | 2019-11-05 | 上海中韩杜科泵业制造有限公司 | A kind of water pump axial force self-balancing device |
CN110410354B (en) * | 2019-09-04 | 2024-04-26 | 上海中韩杜科泵业制造有限公司 | Axial force self-balancing device of water pump |
CN115182881A (en) * | 2022-07-28 | 2022-10-14 | 北京昌佳泵业有限公司 | Middle-open multi-stage centrifugal pump |
CN115182881B (en) * | 2022-07-28 | 2024-05-31 | 北京昌佳泵业有限公司 | Split multi-stage centrifugal pump |
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