CN104061189A - Single flow channel centrifugal pump capable of balancing radial force automatically - Google Patents
Single flow channel centrifugal pump capable of balancing radial force automatically Download PDFInfo
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- CN104061189A CN104061189A CN201410236004.XA CN201410236004A CN104061189A CN 104061189 A CN104061189 A CN 104061189A CN 201410236004 A CN201410236004 A CN 201410236004A CN 104061189 A CN104061189 A CN 104061189A
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- impeller
- gimbal
- pump
- radial force
- diameter
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Abstract
The invention discloses a single flow channel centrifugal pump capable of balancing a radial force automatically. The Single flow channel centrifugal pump comprises a pump housing, an impeller, a pump shaft and a bearing box, wherein the impeller is mounted in the pump housing, and is in fastening connection with the pump shaft through impeller nuts; the impeller has only one blade, so that a single flow channel is formed; the pump shaft is mounted in the bearing box through a bearing and a bearing seat; a C-shaped balancing ring is fixed to the pump shaft, and adopts a notched annular structure; the balancing ring comprises an annular inner wall, an annular outer wall, a front cover plate and a rear cover plate; the balancing ring also adopts a sealing hollow structure, so that a balance weight unit which can slide freely is arranged inside the balancing ring; as the structure of the impeller and water power are dissymmetrical, the impeller has unbalanced radial force which is the main reason for leading the vibration of the pump. According to the single flow channel centrifugal pump, the balancing ring is arranged on the pump shaft, so that the balancing ring can be driven to rotate synchronously when the pump shaft rotates; being affected by the unbalanced radial force, the balance weight unit can slide to a position opposite to the radial force, so that the action of balancing the radial force is realized.
Description
Technical field
The invention belongs to centrifugal pump manufacturing technology field, particularly a kind of single channel centrifugal pump of autobalance radial force.
Background technique
Single blade impeller is the runner of a spatial warping from import to outlet; known Procedure of Single-channel Pump is a kind of as sewage pump; there is the features such as high, the efficient district of efficiency is wide, head curve is steep, the nothing property stopped up is good; be suitable for carrying the liquid that contains the foreign material such as particle or long fibre, there is the incomparable superiority of other sewage pump.But this class formation impeller has the following disadvantages: the one, and single blade impeller is eccentric structure, its non-uniform mass, impeller center of gravity, not on shaft axis, produces mass unbalance power; The 2nd, during the work of single channel centrifugal pump, nonsymmetry due to its structure, the fluid force that makes to act on single blade impeller is also uneven, produce fluid unbalanced force, these two kinds of unbalanced forces synthesize radial force, cause single channel centrifugal pump to have obvious vibration problem, and vibration can cause many failure of pump phenomenons, the problem such as too fast in Rub-impact, rotor crack, sealing wear, bearing damage, the vibration of foundation and noise.Can, by modern dynamic balancing machine to the single blade impeller dynamic balancing of dallying, mass unbalance power be dropped to minimum, but cannot eliminate at present.In addition, the fluid unbalanced force that impeller eccentric structure causes is but inevitable, especially under low flow rate condition, fluid unbalanced force is far longer than mass unbalance power, and its many failure problems such as vibration of bringing has had a strong impact on operational efficiency, safe operation and the working life of pump.
Through retrieval, patent application related to the present invention has: Impeller for centrifugal pump and balance adjustingmethod of impeller for centrifugal pump (publication number: JP2007-255324A), invented a kind of single blade impeller of autobalance radial force, feature is on back shroud of impeller, to add counterweight element, the uneven radial force that the centrifugal force balance single blade impeller producing by counterweight element produces, but this invention structure can not regulate balance position automatically, once run into the situation that uneven radial force causes vibration, impeller need to be dismantled so that readjust balance position, be unfavorable for industrial production.
Summary of the invention
Technical problem to be solved by this invention is, vibration is large, the poor defect of safety reliability because uneven radial force causes for single channel centrifugal pump, proposes a kind of single channel centrifugal pump that can autobalance radial force.
A kind of single channel centrifugal pump of autobalance radial force, comprise pump case, impeller, pump shaft, bearing housing, impeller is arranged in pump case, and be fixedly connected with pump shaft, impeller is provided with a blade, and pump shaft is arranged in bearing housing by bearing, bearing support, and can in bearing housing, freely rotate, pump shaft is provided with gimbal, and bearing housing is fixedly connected with pump case.
Described gimbal is C type, the breach C type circular ring of the sealing being formed by annular inner wall, annular outer wall, front shroud, back shroud, and described gimbal is sealed hollow structure, the counterweight element that its inner setting can be free to slide.
Described impeller is fixedly connected with pump shaft by impeller nut.
Single blade impeller is because the asymmetric radial force of impeller that causes of its structure and waterpower is larger, and this is the main cause that causes pump vibration.This patent by installing gimbal on pump shaft, and when pump shaft is rotated, band balancing loop synchronously rotates, and the counterweight element in gimbal is subject to the automatic sliding that affects of uneven radial force to arrive the position contrary with radial force, plays the effect of balance radial force.
Gimbal is fixed by a pin on pump shaft, and this gimbal consists of the inner chamber of sealing, the outside diameter d of this inner chamber annular inner wall, annular outer wall, front shroud, back shroud
ofor pump shaft diameter d
w1.8～2 times, the inner diameter d of inner chamber
ifor 1.2～1.35 times of pump shaft diameter, the width of inner chamber is 8～15mm; The thickness of the annular inner wall of Compositional balance ring, annular outer wall, front shroud, back shroud is 4～6mm.
The relative position of gimbal and single blade impeller plays very important effect to balance radial force, on axial direction will from impeller close to, the limited space of the less and bearing housing of the effect of gimbal too far away, so the front shroud of gimbal of the present invention is 3.5d apart from the distance of impeller central cross-section in the axial direction
w～4.5d
w; The gimbal designing due to the present invention is C type breach circle structure, this breach has avoided the counterweight element in gimbal because rotator inertia causes its position poor controllability, therefore on circumferencial direction there is certain relative angle in this gap position and blade exit end, and this angle is to rotate 120 °～160 ° along vane rotary direction.
In gimbal inner chamber, place metal slide block as counterweight element, the size of this metal slide block and quality are the keys of balance radial force, metal slide block is too greatly easily stuck in gimbal, and rocking appears in the too little metal slide block that causes in gimbal, may cause the unstable of rotor, its size will just be applicable to gimbal inner chamber, accomplishes to be free to slide resistance little.Therefore designing this metal slide block is fan-shaped, the external diameter r that this is fan-shaped
1for 0.8～0.95 times of gimbal inner chamber external diameter, fan-shaped internal diameter r
2for 1.0～1.1 times of gimbal inner chamber internal diameter.
The quality of gimbal interior metal slide block is excessive not only can not balance radial force, also likely increase radial force, and mistake young pathbreaker does not have the effect of balance radial force, the quality of the balance slide block of the present invention's design is relevant with the radial force that single blade impeller produces, the radial force size producing by calculating single blade impeller, obtains the balancing mass that this radial force of balance needs.Its computational process is: pump fed sheet of a media density p
liquidfor 700kg/m
3～1200kg/m
3, impeller outlet diameter is d2, impeller inlet diameter is d
j, the cornerite of blade is 240 °～400 °, impeller outlet width b
2for 0.8dj～1.0dj, wheel speed n is 980r/min～1450r/min, and the radial force F that impeller is produced by waterpower and Imbalance in weight can calculate with following formula
And the density p of metal slide block
metalfor 6500kg/m
3～8500kg/m
3, the quality m of metal weights slide block is
m＝360F/[n
2(r
1+r
2)]kg (2)
Counterweight element of the present invention also can replace with liquid, preferably, aforesaid metal can replace with liquid mercury, metal slide block need to add lubricating liquid to promote the slip property of metal slide block in gimbal, and adopt liquid mercury, and having improved on the one hand the slip property of counterweight, mercury is as liquid metal on the other hand, there is enough density, can play the effect of counterweight.Meanwhile, cylindrical body is set in gimbal, plays and weaken the mobile effect of mercury; Described cylindrical diameter d
cvalue in following scope
(d
o-d
i)/8≤d
c≤ (d
o-d
igimbal is run through in)/4 (3) in the axial direction this cylindrical body, and in a circumferential direction, cylindrical body is evenly distributed on two concentric circles, and these two concentrically ringed diameters are respectively (d
o+ 3d
i)/4 and (3d
o+ d
i)/4, and the cylindrical body on two concentric circles is staggered, and adjacent column body is 10 °～40 ° at the angle making progress in week.
Preferably, the volume of liquid mercury can obtain by following formula
V＝0.026F/[n
2(r
1+r
2)]m
3(4)
The invention has the beneficial effects as follows: the present invention by arranging gimbal on pump shaft, when pump shaft is rotated, band balancing loop synchronously rotates, and the counterweight element in gimbal is subject to the automatic sliding that affects of uneven radial force to arrive the position contrary with radial force, plays the effect of balance radial force.Alleviate the vibration of Procedure of Single-channel Pump, increase the operational reliability of pump.
Accompanying drawing explanation
Fig. 1 is the section of structure of the single channel centrifugal pump of a kind of autobalance radial force of the present invention.
Fig. 2 is the schematic diagram of embodiment's gimbal axial direction.
Fig. 3 is the schematic diagram of embodiment's gimbal circumferencial direction.
Fig. 4 is the schematic diagram of embodiment's metal slide block counterweigh ring.
Fig. 5 is the schematic diagram of embodiment's mercury counterweigh ring.
In figure: 1. pump case, 2. impeller, 3. pump shaft, 4. bearing housing, 5. impeller nut, 6. blade, 7. bearing, 8. bearing support, 9. gimbal, 10. annular inner wall, 11. annular outer walls, 12. front shrouds, 13. back shrouds, 14. counterweight elements, 15. metal slide blocks, 16. liquid mercurys, 17. cylindrical bodys.
Embodiment
In conjunction with Fig. 1, the single channel centrifugal pump of autobalance radial force of the present invention, a single channel centrifugal pump for autobalance radial force, comprises pump case 1, impeller 2, pump shaft 3, bearing housing 4, and impeller 2 is arranged in pump case 1, and be fixedly connected with pump shaft 3, impeller 2 is provided with a blade 6, and pump shaft is arranged in bearing housing 4 by bearing 7, bearing support 8, and can in bearing housing 4, freely rotate, pump shaft is provided with gimbal 9, and bearing housing 4 is fixedly connected with pump case 1.
In conjunction with Fig. 5, described gimbal 9 is C type, the breach C type circular ring of the sealing being comprised of annular inner wall 10, annular outer wall 11, front shroud 12, back shroud 13, described gimbal is sealed hollow structure, the counterweight element 14 that its inner setting can be free to slide.
Described impeller 2 is fixedly connected with pump shaft 3 by impeller nut 5.
In conjunction with Fig. 2 and Fig. 3, gimbal of the present invention is C type, the breach circular ring being comprised of annular inner wall 10, annular outer wall 11, front shroud 12, back shroud 13, described gimbal is sealed hollow structure, the counterweight element 14 that its inner chamber setting can be free to slide.Gimbal consists of the inner chamber of sealing annular inner wall, annular outer wall, front shroud, back shroud, pump shaft diameter 35mm, and the external diameter of inner chamber is taken as 2 times of pump shaft diameter, for 70mm, the internal diameter of inner chamber is taken as 1.3 times of pump shaft diameter, is 45.5mm, and the width of inner chamber is 10mm.The thickness of the annular inner wall 10 of Compositional balance ring 9, annular outer wall 11, front shroud 12, back shroud 13 is 5mm; The front shroud 12 of gimbal 9 is taken as 3.6 times of pump shaft diameter apart from the length of impeller 2 central cross-sections in the axial direction, is 125mm; The gap position of gimbal 9 is upwards to rotate 140 ° along vane rotary direction with the angle of blade 6 outlet end in week.
In conjunction with Fig. 4, described gimbal 9 inside arrange metal slide block 15 as counterweight element, and this metal slide block is fan-shaped, and this fan-shaped angle is 60 °, fan-shaped external diameter r
1being taken as 0.9 times of gimbal inner chamber external diameter, is 63mm, fan-shaped internal diameter r
2being taken as 1.01 times of gimbal inner chamber internal diameter, is 46mm; The medium that pump is carried is clear water, density p
liquidfor 1000kg/m
3, impeller 2 with reference to prior art handbook according to the appropriate combination of certain selection of specific speed, embodiments of the invention middle outlet diameter d
2elect 225mm as, impeller 2 inlet diameter d
jelect 80mm as, the cornerite of blade 6 is elected 360 ° as, impeller 2 exit width b
2being taken as 0.8125 times of impeller inlet diameter, is 65mm, and because this impeller is single channel, for delivery of sewage coarse, impeller 2 exit widths can suitably be got larger in scope; Impeller 2 rotation speed n are elected 1450r/min as, and impeller 2 is because the radial force F of waterpower and Imbalance in weight generation calculates through formula 1, and result is 1400N; Described metal slide block 15 materials are stainless steel, density p
metalfor 7930kg/m
3, the quality of metal slide block 15 is calculated as 2.2kg through formula 2.
In conjunction with Fig. 4, cylindrical body is set in gimbal, play and weaken the mobile effect of mercury; Described cylindrical diameter is chosen for 3mm in formula 3, this cylindrical body runs through gimbal in the axial direction, in week, make progress, cylindrical body is evenly distributed on two concentric circles that diameter is 51.25mm and 63.75mm, and the cylindrical body on two concentric circles is staggered, adjacent column body is 20 ° at the angle making progress in week.The volume of liquid mercury is calculated as 0.00016m through formula 4
3.
Working procedure is as follows:
When single channel centrifugal pump is worked, pump shaft 3 rotates impeller 2 and gimbal 9 synchronous rotaries, and the counterweight element 14 in gimbal 9 is subject to the automatic sliding that affects of uneven radial force to arrive the position contrary with radial force, plays the effect of balance radial force.
Claims (6)
1. the single channel centrifugal pump of an autobalance radial force, comprise pump case (1), impeller (2), pump shaft (3), bearing housing (4), impeller (2) is arranged in pump case (1), and be fixedly connected with pump shaft (3), impeller (2) is provided with a blade (6), pump shaft is arranged in bearing housing (4) by bearing (7), bearing support (8), and can in bearing housing (4), freely rotate, pump shaft is provided with gimbal (9), and bearing housing (4) is fixedly connected with pump case (1).
2. the single channel centrifugal pump of a kind of autobalance radial force according to claim 1, it is characterized in that, described gimbal (9) is C type, the breach C type circular ring of the sealing being formed by annular inner wall (10), annular outer wall (11), front shroud (12), back shroud (13), described gimbal is sealed hollow structure, the counterweight element (14) that its inner setting can be free to slide.
3. the single channel centrifugal pump of a kind of autobalance radial force according to claim 1, is characterized in that, described impeller (2) is fixedly connected with pump shaft (3) by impeller nut (5).
4. the single channel centrifugal pump of a kind of autobalance radial force according to claim 1, it is characterized in that: described gimbal (9) consists of the inner chamber of sealing, the outside diameter d of this inner chamber annular inner wall (10), annular outer wall (11), front shroud (12), back shroud (13)
ofor pump shaft (3) diameter d
w1.8～2 times, the inner diameter d of inner chamber
ifor pump shaft (3) diameter d
w1.2～1.35 times, the width of inner chamber is 8～15mm; The thickness of the annular inner wall (10) of Compositional balance ring (9), annular outer wall (11), front shroud (12), back shroud (13) is 4～6mm; The front shroud (12) of gimbal (9) is 3.5d apart from the length of impeller (2) central cross-section in the axial direction
w～4.5d
w; The gap position of gimbal (9) is upwards to rotate 120 °～160 ° along vane rotary direction with the angle of blade (6) outlet end in week.
5. the single channel centrifugal pump of a kind of autobalance radial force according to claim 1, it is characterized in that: described gimbal (9) inside arranges metal slide block (15) as counterweight element, this metal slide block is fan-shaped, and this fan-shaped angle is 30 °～60 °, fan-shaped external diameter r
1for 0.8～0.95 times of gimbal (9) inner chamber external diameter, fan-shaped internal diameter r
2for 1.0～1.1 times of gimbal (9) inner chamber internal diameter; The Media density ρ that pump is carried
liquidfor 700kg/m
3～1200kg/m
3, impeller (2) outlet diameter is d
2, impeller (2) inlet diameter is d
j, the cornerite of blade (6) is 240 °～400 °, impeller (2) exit width b
2for 0.8dj～1.0dj, impeller (2) rotation speed n is 980r/min～1450r/min, and impeller (2) is because the radial force F of waterpower and Imbalance in weight generation is
the density p of described metal slide block (15)
metalfor 6500kg/m
3～8500kg/m
3, the quality of metal slide block (15) is 360F/[n
2(r
1+ r
2)] kg.
6. according to the single channel centrifugal pump of a kind of autobalance radial force described in claim 2 to 3 any one, it is characterized in that: this gimbal (9) inside arranges liquid mercury (16) as counterweight element, and the volume of mercury is 0.026F/[n
2(r
1+ r
2)] m
3; Cylindrical body (17) is set in this gimbal (9), plays and weaken the mobile effect of mercury; The diameter of described cylindrical body (17) is (d
o-d
i)/8～(d
o-d
i)/4, this cylindrical body (17) runs through gimbal (9) in the axial direction, in week, makes progress, and it is (d that cylindrical body (17) is evenly distributed on diameter
o+ 3d
i)/4 and (3d
o+ d
ion two concentric circles of)/4, and the cylindrical body (17) on two concentric circles is staggered, and adjacent column body is 10 °～40 ° at the angle making progress in week.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410236004.XA CN104061189B (en) | 2014-05-29 | 2014-05-29 | A kind of single channel centrifugal pump of autobalance radial load |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410236004.XA CN104061189B (en) | 2014-05-29 | 2014-05-29 | A kind of single channel centrifugal pump of autobalance radial load |
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| Publication Number | Publication Date |
|---|---|
| CN104061189A true CN104061189A (en) | 2014-09-24 |
| CN104061189B CN104061189B (en) | 2017-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410236004.XA Active CN104061189B (en) | 2014-05-29 | 2014-05-29 | A kind of single channel centrifugal pump of autobalance radial load |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967242A (en) * | 2015-06-12 | 2015-10-07 | 陕西宝成航空仪表有限责任公司 | Full-gluing dynamic balancing gyro motor |
| CN105570185A (en) * | 2016-01-25 | 2016-05-11 | 江苏大学 | Single-channel pump impeller with radial force balance disc |
| CN111756169A (en) * | 2019-03-28 | 2020-10-09 | 日本电产株式会社 | Motor, rotary blade device, and unmanned aerial vehicle |
| CN112483461A (en) * | 2020-10-21 | 2021-03-12 | 南通大学 | Radial force self-balancing method of single-blade centrifugal pump |
| CN113366968A (en) * | 2021-05-21 | 2021-09-10 | 江苏大学 | Automatic balancing device for threshing cylinder of combine harvester and control method |
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| CN202301218U (en) * | 2011-10-18 | 2012-07-04 | 元山科技工业股份有限公司 | Heat radiation fan for balancing counter weight automatically |
| CN203978945U (en) * | 2014-05-29 | 2014-12-03 | 江苏大学 | A kind of single channel centrifugal pump of autobalance radial force |
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2014
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| US4025246A (en) * | 1974-08-12 | 1977-05-24 | Michel Normandin | Rotary machine with counterweights for interfitted vanes |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967242A (en) * | 2015-06-12 | 2015-10-07 | 陕西宝成航空仪表有限责任公司 | Full-gluing dynamic balancing gyro motor |
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| CN105570185B (en) * | 2016-01-25 | 2018-05-11 | 江苏大学 | A kind of Procedure of Single-channel Pump impeller with balanced radial force disk |
| CN111756169A (en) * | 2019-03-28 | 2020-10-09 | 日本电产株式会社 | Motor, rotary blade device, and unmanned aerial vehicle |
| US11548629B2 (en) | 2019-03-28 | 2023-01-10 | Nidec Corporation | Motor, rotor device, and drone |
| CN112483461A (en) * | 2020-10-21 | 2021-03-12 | 南通大学 | Radial force self-balancing method of single-blade centrifugal pump |
| CN113366968A (en) * | 2021-05-21 | 2021-09-10 | 江苏大学 | Automatic balancing device for threshing cylinder of combine harvester and control method |
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