CN102878104B - Axial force balanced structure of multilevel central opening type centrifugal pump - Google Patents
Axial force balanced structure of multilevel central opening type centrifugal pump Download PDFInfo
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- CN102878104B CN102878104B CN201210416609.8A CN201210416609A CN102878104B CN 102878104 B CN102878104 B CN 102878104B CN 201210416609 A CN201210416609 A CN 201210416609A CN 102878104 B CN102878104 B CN 102878104B
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Abstract
The invention discloses an axial force balanced structure of a multilevel central opening type centrifugal pump. A plurality of and an odd number of impellers are assembled on a pump shaft, the odd number of impellers are separated into two groups, the two groups of impellers have different directions, one group has one more impeller than the other group, inter-level rings and inter-level sleeves are assembled between the two groups of impellers, the inter-level sleeves are positioned on the insides of the inter-level rings, so that the outlets of the two groups of impellers are communicated through gaps between the inter-level sleeves by the inter-level rings, a pressure-relief ring and a pressure-relief sleeve are assembled between a second suction cavity and a second throat bush, the pressure-relief sleeve is positioned on the inside of the pressure-relief sleeve, a balance tube is connected through a hollow cavity which is formed by the second throat bush, the pressure-relief ring and the pressure-relief sleeve and is communicated with a first suction cavity, so that the second suction cavity is communicated with the first suction cavity through the gap between the pressure-relief ring and the pressure-relief sleeve as well as the balance tube. According to the structure, the external diameter variation of the inter-level rings and the pressure-relief ring is adopted to form the axial force balance of a rotor, the structure is simple and easy to realize and a good axial force balance effect can be realized.
Description
Technical field
The invention belongs to multistage middle open formula centrifugal pump, specifically multistage middle open formula centrifugal pump axial force balance structure.
Background technique
The axial force of single stage centrifugal pump, smaller for axial force, structurally do not carry out balance, directly by bearing, born; Larger for axial force, adopt the mode in choma binding equilibrium hole to carry out balance more.For multistage pump, its axial equilibrium of forces, adopts the structure of balancing drum associating thrust-bearing to carry out balancing axial thrust; For sectional type multi-stage pump, adopt Balance disc to carry out balancing axial thrust more.
Due to the restriction of structural characteristics, for center-opening type multi-stage pump, the mode that axial force balance adopts even level impeller to be arranged symmetrically with more is carried out the axial force of ballast pump.
Also having center-opening type multi-stage pump odd level axial force of impeller equilibrium structure abroad, is to adopt on the basis of back-to-back layout balancing axial thrust, and the axial force of unnecessary one-level impeller, adopts the mode in choma binding equilibrium hole to carry out the unnecessary one-level axial force of balance.But this balance mode is larger owing to affected by fluid, slightly calculate accidentally, be prone to axial force unbalance, cause bearing damage.
Summary of the invention
The technical assignment of the technical problem to be solved in the present invention and proposition is to overcome existing center-opening type multi-stage pump odd level axial force of impeller equilibrium structure affected by fluid to be prone to more greatly axial force unbalance, cause the defect of bearing damage, a kind of multistage middle open formula centrifugal pump axial force balance structure is provided.
Achieve the above object for this reason, multistage middle open formula centrifugal pump axial force balance structure of the present invention, comprise by pump seat, the pump housing that pump cover forms, in the pump housing, by flowing to, successively establish the first suction chamber, the second suction chamber, first throat's lining is established in the outer end of described the first suction chamber, second throat's lining is established in the outer end of described the second suction chamber, one pump shaft also passes first described throat's lining by being divided into the bearing assemble at pump housing two ends on the pump housing, the first suction chamber, the second suction chamber, second throat's lining, it is characterized in that: on described pump shaft, assemble a plurality of and be the impeller of odd number, this odd number impeller is divided into two groups, the opposite direction of described two groups of impellers and wherein one group compared with another group, have more an impeller, between described two groups of impellers, assemble inter-stage ring, inter-stage cover, described inter-stage cover is assemblied on described pump shaft, described inter-stage ring is assemblied on the described pump housing, described inter-stage cover is positioned at inter-stage ring radially inner side, the outlet of described two groups of impellers is communicated with the gap between inter-stage cover by described inter-stage ring, between the second described suction chamber and second throat's lining, assemble pressure relief ring, pressure release cover, described pressure release cover is assemblied on described pump shaft, described pressure relief ring is assemblied on the described pump housing, described pressure release cover is positioned at pressure relief ring radially inner side, one balance tube is from described the second throat's lining and pressure relief ring, the cavity forming between pressure release cover accesses and is communicated with the first suction chamber, make the gap of the second suction chamber between described pressure relief ring and pressure release cover, balance tube is communicated with the first suction chamber.
As optimization technique means, the one group of impeller that is positioned at upstream is positioned at many one of one group of impeller in downstream.Or one group of impeller that the one group of impeller that is positioned at upstream is positioned at downstream lacks one.
As optimization technique means, the first described suction chamber, the second suction chamber lay respectively at the two end part of the described pump housing, the outlet that is positioned at one group of impeller of upstream connects the second described suction chamber by runner, is positioned at all sides of one group of impeller in downstream described in described runner is distributed in.Further, the outlet that is positioned at one group of impeller in downstream described in is positioned at the middle part of the pump housing and connects exhaust port, the first described suction chamber connection suction port.
As optimization technique means, make-up machinery sealing between the bearing described in each and the pump housing.
As optimization technique means, described inter-stage cover, pressure release cover are assemblied on pump shaft by key, and described inter-stage ring, pressure relief ring are positioned on the pump housing by pin.
The invention has the beneficial effects as follows: axial force balance is easy, easy realization simple in structure, axial force balance is effective, and life of product is long.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is the A portion enlarged view in Fig. 1;
Fig. 3 is the B portion enlarged view in Fig. 1;
Number in the figure explanation: 1-pump seat, 2-pump cover, 3-the first suction chamber, 4-the second suction chamber, 5-pump shaft, 6-bearing, 7-bearing, 8-one-level impeller, 9-sencond stage impeller, tri-grades of impellers of 10-, 11-level Four impeller, 12-Pyatyi impeller, six grades of impellers of 13-, seven grades of impellers of 14-, 15-balance tube, 16-inter-stage ring, 17-inter-stage cover, 18-pressure relief ring, 19-pressure release cover, 20-mechanical seal, 21-mechanical seal, 22-passage, 23-first throat's lining, 24-second throat's lining, X-pressure release cover 19, cavity between pressure relief ring 18 and second throat's lining 24, cavity between 17 and seven grades of impellers 14 of Y-inter-stage cover, cavity between Z-inter-stage cover 17 and level Four impeller 11.
Embodiment
Below in conjunction with Figure of description, the present invention will be further described.
Multistage middle open formula centrifugal pump axial force balance structure of the present invention, as shown in Figure 1, it comprises by pump seat 1, the pump housing that pump cover 2 forms, in the pump housing, by flowing to, successively establish the first suction chamber 3, the second suction chamber 4, first throat's lining is established in the outer end of the first suction chamber 3 (away from suck one end of the impeller of fluid from the first suction chamber), second throat's lining is established in the outer end of the second suction chamber 4 (away from suck one end of the impeller of fluid from the second suction chamber), one pump shaft 5 is by being divided into the bearing 6 at pump housing two ends, 7 are assemblied on the pump housing and through first throat's lining, the first suction chamber 3, the second suction chamber 4, second throat's lining, on pump shaft 5, assemble a plurality of and be the impeller of odd number, this odd number impeller is divided into two groups, the opposite direction of two groups of impellers and wherein one group compared with another group, have more an impeller (being illustrated as 7 grades of impellers), between two groups of impellers, assemble inter-stage ring 16, inter-stage cover 17, inter-stage cover 17 is assemblied on pump shaft 5, inter-stage ring 16 is assemblied on the pump housing, inter-stage cover 17 is positioned at inter-stage ring 16 radially inner sides, the outlet of two groups of impellers is communicated with the gap between inter-stage cover 17 by inter-stage ring 16, between the second suction chamber 4 and second throat's lining, assemble pressure relief ring 18, pressure release cover 19, pressure release cover 19 is assemblied on pump shaft 5, pressure relief ring 18 is assemblied on the pump housing, pressure release cover 19 is positioned at pressure relief ring 18 radially inner sides, one balance tube 15 is from second throat's lining and pressure relief ring 18, the cavity X forming between pressure release cover 19 accesses and is communicated with the first suction chamber 3, make the gap of the second suction chamber 4 between pressure relief ring 18 and pressure release cover 19, balance tube 15 is communicated with the first suction chamber 3.
As further improving and supplementing technique scheme, the present invention also comprises following additional technical characteristics, although figure has comprised following all additional technical features, it is preferred embodiment of the present invention, but the present invention is not limited to this situation, when enforcement is of the present invention, according to concrete effect, they are selected in the technological scheme described in epimere.
First, the one group of impeller that is positioned at upstream is positioned at many one of one group of impeller in downstream.
Secondly, the first suction chamber 3, the second suction chamber 4 lay respectively at the two end part of the pump housing, and the outlet that is positioned at one group of impeller of upstream connects the second suction chamber by runner 22, and runner 22 is distributed in all sides of the one group of impeller that is positioned at downstream.Further, the outlet that is positioned at one group of impeller in downstream is positioned at the middle part of the pump housing and connects exhaust port, and the first suction chamber connects suction port.
The 3rd, make-up machinery sealing 20,21 between each bearing 6,7 and the pump housing.
The 4th, inter-stage cover 17, pressure release cover 19 are assemblied on pump shaft 5 by key, and inter-stage ring 16, pressure relief ring 18 are positioned on the pump housing by pin.
According to Fig. 1, analyze known, except every grade of impeller produces axial force separately, first throat's lining 23, second throat's lining 24 at inter-stage cover 17, pressure release cover 19 and two ends also produce axial force in totally four regions, wherein, first throat's lining 23 at two ends, second throat's lining 24 position axial forces are less, generally ignore.
In seven grades of impellers, except one-level impeller 8, the forward and backward choma outside dimension of all the other impellers at different levels is identical, and the axial force size of every grade of impeller generation is identical; And, sencond stage impeller 9, three grades of impellers 10, level Four impeller 11 and Pyatyi impeller 12, six grades of impellers 13, seven grades of impeller 14 mounting points are just centered by inter-stage cover 17, symmetry is installed dorsad, and the axial force that sencond stage impeller 9, three grades of impellers 10, level Four impellers 11 produce is pointed to right-hand member, Pyatyi impeller 12, six grades of impellers 13, seven grades of axial forces that impeller 14 produces are pointed to left end, therefore, sencond stage impeller 9, three grades of impellers 10, level Four impeller 11 and Pyatyi impeller 12, six grades of impellers 13, seven grades of axial forces that impeller 14 produces be balance just, cancels each other.Remaining one-level impeller 8, inter-stage cover 17, pressure release cover 19 3 parts due to its two ends pressure not etc., will produce separately axial force.Thus, rotor axial equilibrium of forces calculates, and only needs to adjust the axial force balance at one-level impeller 8, inter-stage cover 17, pressure release cover 19 3 part positions.
The axial force of one-level impeller 8 can be divided two-part.First portion: compression area is the axial area between the forward and backward choma external diameter of one-level impeller 8, the lift that pressure difference is this impeller, direction is pointed to right-hand member.Second portion: compression area be the rear choma external diameter of one-level impeller 8 to the axial area between pump shaft 5, pressure difference is also the lift of this impeller, direction is pointed to right-hand member.
The Axial Force Calculating of pressure release cover 19 is products of its compression area and front and back pressure difference.Compression area is that the axial area between 19 external diameters and pump shaft is overlapped in pressure release.Because pressure release cover 19, pressure relief ring 18 are communicated with the first suction chamber 3 with the cavity X between second throat's lining 24, the cavity X pressure between pressure release cover 19, pressure relief ring 18 and second throat's lining 24 is pump inlet pressure.It is the second suction chamber 4 that 19 opposite sides are overlapped in pressure release, and it is the outlet cavity of one-level impeller 8, sencond stage impeller 9, three grades of impellers 10, level Four impeller 11.So the pressure difference of pressure release cover 19 is one-level impeller 8, sencond stage impeller 9, three grades of lift sums that impeller 10, level Four impeller 11 produce, axial force is pointed to left end.
The Axial Force Calculating of inter-stage cover 17 is products of its compression area and front and back pressure difference.Compression area is that inter-stage overlaps 17 external diameters to the axial area between pump shaft 5.Because inter-stage cover 17 is connected the exhaust port of pump with the cavity Y between seven grades of impellers 14, inter-stage cover 17 is connected the second suction chamber 4 with the cavity Z between level Four impeller 11 through passage 22, again because the second suction chamber 4 is one-level impeller 8, sencond stage impeller 9, three grades of impellers 10, the outlet cavity of level Four impeller 11, so the pressure difference of inter-stage cover 17 is one-level impeller 8, sencond stage impeller 9, three grades of impellers 10, level Four impeller 11, Pyatyi impeller 12, six grades of impellers 13, the lift of seven grades of impellers 14 deducts one-level impeller 8, sencond stage impeller 9, three grades of impellers 10, the lift of level Four impeller 11, be Pyatyi impeller 12, six grades of impellers 13, the lift of seven grades of impellers 14 and, axial force is pointed to right-hand member.
Thus, calculate the axial force of this odd level vane rotor, axial force and the axial force sum of pressure release cover 19 generations and the axial force balances that inter-stage cover 17 produces that we only need allow one-level impeller 8 produce.Adopt said method just to solve an axial force balance difficult problem for middle open type odd level multistage pump.This structure is not only calculated feasible in theory, but also has passed through the practice use checking of tens model center-opening type multi-stage pumps.
According to the above description, while specifically implementing, can make the one group of impeller that is positioned at upstream be positioned at few one of one group of impeller in downstream, can realize the object of the invention equally.
The present invention adopts the external diameter of internode ring and pressure relief ring to change, and forms rotor axial equilibrium of forces; In odd level impeller, 7 grades of impellers for example, wherein six grades of employings are arranged symmetrically with self-balanced thrust, and remaining one-level impeller adopts inter-stage cover and the variation of inter-stage ring, pressure release cover and pressure relief ring outside dimension to carry out balance.Structure of the present invention, through the design verification of tens kinds of specification products, has axial force balancing method easy, easy realization simple in structure, the feature that axial force balance is effective.
Claims (7)
1. multistage middle open formula centrifugal pump axial force balance structure, comprise by pump seat (1), the pump housing that pump cover (2) forms, in the pump housing, by flowing to, successively establish the first suction chamber (3), the second suction chamber (4), first throat's lining (23) is established in the outer end of described the first suction chamber (3), second throat's lining (24) is established in the outer end of described the second suction chamber (4), one pump shaft (5) is by being divided into the bearing (6 at pump housing two ends, 7) be assemblied on the pump housing and through first described throat's lining (23), the first suction chamber (3), the second suction chamber (4), second throat's lining (24), it is characterized in that: described pump shaft (5) above assembles a plurality of and is the impeller of odd number, this odd number impeller is divided into two groups, the opposite direction of described two groups of impellers and wherein one group compared with another group, have more an impeller, between described two groups of impellers, assemble inter-stage ring (16), inter-stage cover (17), described inter-stage cover (17) is assemblied on described pump shaft (5), described inter-stage ring (16) is assemblied on the described pump housing, described inter-stage cover (17) is positioned at inter-stage ring (16) radially inner side, the outlet of described two groups of impellers is communicated with the gap between inter-stage cover (17) by described inter-stage ring (16), between described the second suction chamber (4) and second throat's lining, assemble pressure relief ring (18), pressure release cover (19), described pressure release cover (19) is assemblied on described pump shaft (5), described pressure relief ring (18) is assemblied on the described pump housing, described pressure release cover (19) is positioned at pressure relief ring (18) radially inner side, one balance tube (15) is from described second throat's lining and pressure relief ring (18), the cavity (X) forming between pressure release cover (19) accesses and is communicated with the first suction chamber (3), make the gap of the second suction chamber (4) between described pressure relief ring (18) and pressure release cover (19), balance tube (15) is communicated with the first suction chamber (3).
2. multistage middle open formula centrifugal pump axial force balance structure according to claim 1, is characterized in that: the one group of impeller that is positioned at upstream is positioned at many one of one group of impeller in downstream.
3. multistage middle open formula centrifugal pump axial force balance structure according to claim 1, is characterized in that: the one group of impeller that is positioned at upstream is positioned at few one of one group of impeller in downstream.
4. multistage middle open formula centrifugal pump axial force balance structure according to claim 1, it is characterized in that: described the first suction chamber (3), the second suction chamber (4) lay respectively at the two end part of the described pump housing, the outlet that is positioned at one group of impeller of upstream connects described the second suction chamber (4) by runner (22), is positioned at all sides of one group of impeller in downstream described in described runner (22) is distributed in.
5. multistage middle open formula centrifugal pump axial force balance structure according to claim 4, is characterized in that: described in be positioned at one group of impeller in downstream outlet be positioned at the middle part of the pump housing and connect exhaust port, the first described suction chamber connects suction port.
6. multistage middle open formula centrifugal pump axial force balance structure according to claim 1, is characterized in that: make-up machinery sealing (20,21) between the bearing described in each (6,7) and the pump housing.
7. multistage middle open formula centrifugal pump axial force balance structure according to claim 1, it is characterized in that: described inter-stage cover (17), pressure release cover (19) are assemblied in pump shaft (5) above by key, and described inter-stage ring (16), pressure relief ring (18) are positioned on the pump housing by pin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210416609.8A CN102878104B (en) | 2012-10-25 | 2012-10-25 | Axial force balanced structure of multilevel central opening type centrifugal pump |
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| CN201210416609.8A CN102878104B (en) | 2012-10-25 | 2012-10-25 | Axial force balanced structure of multilevel central opening type centrifugal pump |
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| CN102878104A CN102878104A (en) | 2013-01-16 |
| CN102878104B true CN102878104B (en) | 2014-11-26 |
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| CN103225624A (en) * | 2013-04-24 | 2013-07-31 | 嘉利特荏原泵业有限公司 | Double-casing symmetric type radial subdivision multiple-stage centrifugal pump |
| ITUB20153032A1 (en) * | 2015-08-10 | 2017-02-10 | Nuovo Pignone Tecnologie Srl | CENTRIFUGAL PUMP |
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| CN1439808A (en) * | 2002-07-10 | 2003-09-03 | 甘肃工业大学 | Multistage sectional centrifugal pump with symmetric impeller arrangement |
| CN100365289C (en) * | 2006-03-03 | 2008-01-30 | 江苏大学 | Multi-stage centrifugal pump capable of self-balancing axial force by impeller |
| GB2462635B (en) * | 2008-08-14 | 2010-07-14 | William Paul Hancock | Turbo-machines thrust balancer |
| IT1392143B1 (en) * | 2008-09-15 | 2012-02-22 | Pompe Garbarino S P A | MULTI-STAGE CENTRIFUGAL PUMP WITH HYDRAULIC BALANCING DRUM WITH CONTROLLED DRAWING. |
| CN101509490A (en) * | 2009-04-03 | 2009-08-19 | 湖北三峡泵业有限公司 | Axial force self-balancing multiple stage centrifugal pump |
| CN101892990B (en) * | 2010-06-13 | 2011-11-16 | 西安航天泵业有限公司 | Horizontal split multi-stage pump |
| CN201934361U (en) * | 2010-11-03 | 2011-08-17 | 西安泵阀总厂有限公司 | Mosaic sealing ring structure of centrifugal pump |
| CN202811460U (en) * | 2012-10-25 | 2013-03-20 | 浙江佳力科技股份有限公司 | Multistage middle-open type centrifugal pump axial force balance structure |
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