CN112727805A - Suction structure of double-shell radial subdivision multistage centrifugal pump and design method thereof - Google Patents
Suction structure of double-shell radial subdivision multistage centrifugal pump and design method thereof Download PDFInfo
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- CN112727805A CN112727805A CN202110154015.3A CN202110154015A CN112727805A CN 112727805 A CN112727805 A CN 112727805A CN 202110154015 A CN202110154015 A CN 202110154015A CN 112727805 A CN112727805 A CN 112727805A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—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
- F04D29/4273—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps suction eyes
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/086—Sealings especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2205—Conventional flow pattern
- F04D29/2222—Construction and assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/08—Fluids
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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Abstract
The invention discloses a suction structure of a double-shell radial subdivision multistage centrifugal pump and a design method thereof, belonging to the technical field of multistage centrifugal pumps. The design method of the suction structure of the double-shell radial subdivision multistage centrifugal pump provided by the invention is convenient for the double-shell radial section multistage centrifugal pump to carry out independent optimization design according to different impeller working conditions, avoids liquid from entering an annular space in a suddenly enlarged form and then entering an impeller in a suddenly contracted form, reduces the hydraulic loss in the process, avoids the waste of water, improves the environmental protection performance of the device, reduces the noise generated by the impact of the fluid on a pump shaft, and ensures that the device is more environment-friendly.
Description
Technical Field
The invention relates to the technical field of multistage centrifugal pumps, in particular to a suction structure of a double-shell radial subdivision multistage centrifugal pump and a design method thereof.
Background
The existing double-shell radial subdivision high-pressure decoking water pump for factory return maintenance has the advantages that a large number of erosion pits appear at the annular suction chamber of a shaft, the influence on the strength of the shaft is great, the shaft needs to be replaced when the pump is maintained, economic loss is caused, and the evaluation of a client on a company product is influenced.
The application number is CN201420477895.3, the middle discharge section of the multi-outlet horizontal single-suction sectional type multistage centrifugal pump comprises a discharge flange, a discharge section, a support bottom plate, a sealing ring, a de-swirl flow guide vane, a support plate and discharge section supporting legs, wherein the discharge section is fixed on the discharge section supporting legs, a water pressing chamber is arranged in the discharge section, a feed inlet, a discharge outlet and a discharge outlet are arranged on the discharge section, the feed inlet and the discharge outlet are respectively arranged corresponding to an upper-stage impeller and a lower-stage impeller, the discharge outlet is arranged at the upper end of the discharge section and communicated with the discharge flange, the support bottom plate is arranged in the water pressing chamber and connected with the inner side of the discharge outlet, the support plate is arranged in the water pressing chamber and close to the feed inlet, a de-swirl flow guide vane is arranged on the support plate and extends towards one side of the support bottom plate, and the sealing ring is matched. The middle discharge section has the functions of pressure division and flow division water supply, wide flow regulation range, good flow state and high efficiency.
In the process of implementing the embodiment of the invention, the inventor finds that at least the following defects exist in the background art:
although the device is simple and symmetrical in structure, the annular suction chamber cannot guarantee that the impeller inlet has an axisymmetric speed field, liquid enters the annular space in a suddenly enlarged mode and then enters the impeller in a suddenly contracted mode, the loss of the liquid in the process is large, the liquid is wasted, the environmental protection performance is reduced, the liquid flows unevenly, fluid passing through the pump inlet directly impacts the pump shaft, and the erosion of the pump shaft is increased.
Disclosure of Invention
The invention aims to provide a suction structure of a double-shell radial subdivision multistage centrifugal pump and a design method thereof, and aims to solve the technical problems that an impeller inlet cannot be guaranteed to have an axisymmetric speed field and flow is not uniform in the background technology.
The technical scheme of the invention is as follows: a suction structure of a double-casing radially split multistage centrifugal pump, wherein: including outer barrel, suction side stuffing box, impeller and fix the first grade middle section on outer barrel, be equipped with the pump inlet on the outer barrel, the inside of outer barrel is equipped with the pump shaft rather than the coaxial setting, the impeller passes through the key-type connection to be fixed with the snap ring on the pump shaft, form annular suction chamber between suction side stuffing box and the first grade middle section.
As the further optimization of this technical scheme, suction side stuffing box has the lower streamline of annular suction chamber, the side of the lower streamline of annular suction chamber is equipped with the blotter of making an uproar, and its inside packing has the sound of inhaling cotton.
As the further optimization of the technical scheme, the first-stage middle section is provided with an annular suction chamber upper streamline, and the annular suction chamber is positioned between the annular suction chamber upper streamline and the annular suction chamber lower streamline.
As a further optimization of the technical proposal, the annular suction chamber can be formed by the lower streamline of the annular suction chamber and the upper streamline of the annular suction chamber rotating by 360 degrees.
As a further optimization of the technical scheme, a shell sealing ring is arranged on the first-stage middle section.
As a further optimization of the technical scheme, the impeller is sleeved with an impeller sealing ring.
As a further optimization of this technical scheme, the lateral wall of suction side packing letter body is equipped with the fender stream ring that is the loop configuration, and it is articulated with suction side packing letter body, suction side packing letter body is equipped with a plurality of rust-resistant springs that are the circumference and distribute, every rust-resistant spring's both ends are connected respectively on the inner wall and the suction side packing letter body lateral wall that keep off the stream ring.
The invention also provides a design method of the suction structure of the double-shell radial subdivision multistage centrifugal pump, which is used for the suction structure of the double-shell radial subdivision multistage centrifugal pump, wherein the method comprises the following steps:
the method comprises the following steps: the annular suction chamber is simplified and can be formed by rotating the lower streamline of the annular suction chamber and the upper streamline of the annular suction chamber by 360 degrees;
step two: according to the design flow condition, the annular suction chamber is optimized by adopting a quintic-square Bezier curve in Solidworks software to generate an annular suction chamber fluid domain;
step three: drawing an impeller fluid domain by using Solidworks software;
step four: dividing an annular suction chamber and an impeller grid by ICEM CFD software;
step five: performing flow field analysis by CFX software;
step six: checking flow field analysis data by using post-processing software of CFX, and finding out the problem of the annular suction chamber;
step seven: optimizing the annular suction chamber by adopting a quintic-square Bezier curve in Solidworks software;
step eight: and judging whether the annular suction chamber has problems, if so, returning to the step two, repeating the step two to the step seven, and if not, obtaining the optimal annular suction chamber.
As a further optimization of the technical scheme, in the second step, the Bezier curve formula is
。
As a further optimization of the technical scheme, in the sixth step, the flow field analysis data can be flow lines, speed, pressure and efficiency.
The invention provides a suction structure of a double-shell radial subdivision multistage centrifugal pump and a design method thereof through improvement, compared with the prior art, the suction structure has the following improvements and advantages:
the design method of the suction structure of the double-shell radial subdivision multistage centrifugal pump provided by the invention is convenient for the double-shell radial section multistage centrifugal pump to carry out independent optimization design according to different impeller working conditions, improves the pump efficiency, improves the product competitiveness, and prevents liquid from entering an annular space in a suddenly enlarged form and then entering an impeller in a suddenly contracted form by virtue of the optimized annular suction chamber, thereby reducing the hydraulic loss in the process, improving the flow uniformity, improving the pump efficiency, reducing the erosion to a pump shaft, avoiding the waste of water and improving the environmental protection performance of the device.
And secondly, the pump shaft can be protected under the action of the lower flow line of the annular suction chamber and the upper flow line of the annular suction chamber, so that the direct impact of fluid at the inlet of the pump on the pump shaft is avoided, the impact of the fluid on the pump shaft is reduced, and the erosion of the pump shaft is further reduced.
Thirdly, through adopting the annular suction chamber lower flow line to reduce the impact of fluid, and then reduced because the fluid strikes the noise that produces to the pump shaft, in order to further noise reduction, fall the blotter of making an uproar and its inside sound of inhaling cotton, come the further amortization of noise and handle, make this device environmental protection more.
Drawings
The invention is further explained below with reference to the figures and examples:
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is a radial cross-sectional view of the present invention;
FIG. 3 is a cross-sectional view of a suction side stuffing box of the present invention;
FIG. 4 is a sectional view of the first stage of the present invention;
FIG. 5 is a flow chart of a design method of the present invention;
FIG. 6 is a cross-sectional view of a second embodiment of the present invention;
fig. 7 is an enlarged view of a portion a of fig. 6.
Description of reference numerals:
1. a suction side stuffing box; 2. an outer cylinder; 3. a first stage middle section; 4. a housing seal ring; 5. an impeller seal ring; 6. an impeller; 7. a pump shaft; 8. a snap ring; 9. an annular suction chamber; 10. a pump inlet; 11. a lower flow line of the annular suction chamber; 12. an annular suction chamber up flow line; 13. a flow blocking ring; 14. an antirust spring.
Detailed Description
The present invention will be described in detail with reference to fig. 1 to 7, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the present invention provides a suction structure of a double-casing radially split multistage centrifugal pump, as shown in fig. 1 to 5, by improving a suction structure of a double-casing radially split multistage centrifugal pump, in which: including outer barrel 2, suction side packing box 1, impeller 6 and fix first level middle section 3 on outer barrel 2, be equipped with pump inlet 10 on outer barrel 2, the inside of outer barrel 2 is equipped with the pump shaft 7 rather than coaxial setting, 6 fixes through snap ring 8 for the key-type connection impeller on 7 pump shaft, form annular suction chamber 9 between suction side packing box 1 and the first level middle section 3. Suction side packing box body 1 and the annular suction chamber 9 that first grade middle section 3 formed, avoid the direct pump shaft 7 towards suction section department of fluid, reduce the impact of fluid to pump shaft 7, reduce the erosion to pump shaft 7, avoid liquid to get into annular space with the form of expanding suddenly and later get into impeller 6 with the form of contracting suddenly again, reduce the hydraulic loss of this process, avoid the waste of water resource, the environmental protection performance of this device has been improved, in order to solve to propose can not guarantee that impeller 6 import has axisymmetric velocity field and the inhomogeneous technical problem that flows.
Suction side stuffing box 1 has under the annular suction chamber streamline 11, the side of under the annular suction chamber streamline 11 is equipped with the blotter of making an uproar, its inside packing has the sound of inhaling cotton, under the annular suction chamber streamline 11 be used in under the annular suction chamber streamline 11 to lead the fluid through pump inlet 10, reduce the impact of fluid to pump shaft 7, reduce the erosion to pump shaft 7, streamline 11 has reduced fluidic impact through adopting under the annular suction chamber, and then reduced because the fluid strikes the noise that produces to pump shaft 7, for further noise reduction, the blotter of making an uproar and its inside sound of inhaling cotton fall, come further noise reduction to the noise, make this device environmental protection more.
The first-stage middle section 3 is provided with an annular suction chamber upper streamline 12, and the annular suction chamber 9 is positioned between the annular suction chamber upper streamline 12 and an annular suction chamber lower streamline 11; the annular space is used for the fluid of pump entry 10 to pass through, can protect pump shaft 7 under the effect of annular suction chamber lower flow line 11 and annular suction chamber upper flow line 12, avoids the direct impact to pump shaft 7 of fluid of pump entry 10, reduces the impact of fluid to pump shaft 7, and then reduces the erosion to pump shaft 7.
The annular suction chamber 9 can be formed by a rotation of 360 ° of the annular suction chamber lower streamline 11 and the annular suction chamber upper streamline 12.
And a shell sealing ring 4 is arranged on the first-stage middle section 3 and is used for sealing.
The impeller 6 is sleeved with an impeller 6 sealing ring 5, and the impeller 6 sealing ring is made of thermoplastic polyurethane rubber TPU.
The invention also provides a design method of the suction structure of the double-shell radial subdivision multistage centrifugal pump, which is used for the suction structure of the double-shell radial subdivision multistage centrifugal pump, wherein the method comprises the following steps:
the method comprises the following steps: the annular suction chamber 9 is simplified, and the annular suction chamber 9 can be formed by rotating the annular suction chamber lower streamline 11 and the annular suction chamber upper streamline 12 through 360 degrees;
step two: according to the design flow condition, the annular suction chamber 9 is optimized by adopting a quintic-quadratic Bezier curve in Solidworks software to generate a fluid domain of the annular suction chamber 9;
step three: drawing a fluid domain of the impeller 6 by using Solidworks software;
step four: dividing the annular suction chamber 9 and the impeller 6 grid by ICEM CFD software;
step five: performing flow field analysis by CFX software;
step six: checking flow field analysis data by using post-processing software of CFX, and finding out the problem of the annular suction chamber 9;
step seven: optimizing the annular suction chamber 9 by adopting a quintic-square Bezier curve in Solidworks software;
step eight: and judging whether the annular suction chamber 9 has a problem, if so, returning to the step two, repeating the step two to the step seven, and if not, obtaining the optimal annular suction chamber 9.
The design method of the suction structure of the double-shell radial subdivision multistage centrifugal pump provided by the invention is convenient for the double-shell radial section multistage centrifugal pump to carry out independent optimization design according to different working conditions of the impeller 6, improves the pump efficiency and the product competitiveness, and the optimized annular suction chamber 9 prevents liquid from entering an annular space in a suddenly enlarged form and then entering the impeller 6 in a suddenly contracted form, thereby reducing the hydraulic loss in the process, improving the flow uniformity, improving the pump efficiency and reducing the erosion to the pump shaft 7.
In step two, the Bezier curve formula is
. Wherein, B (t) is a representation symbol of a Bezier control curve equation, P is a control point of a cubic Bezier curve, and t is a control value of the Bezier curve.
In step six, the flow field analysis data may be flow line, velocity, pressure and efficiency.
Example two:
based on the design method of the suction structure of the double-casing radially-split multistage centrifugal pump provided in the first embodiment of the present application, a second embodiment of the present application provides another design method of the suction structure of the double-casing radially-split multistage centrifugal pump. The second embodiment is merely a preferred way of the first embodiment, and the implementation of the second embodiment does not affect the implementation of the first embodiment alone.
The second embodiment of the present invention will be further described with reference to the drawings and the following description.
As shown in fig. 6-7, to further solve the problem of fluid impact on the pump shaft 7, according to an embodiment, the sidewall of the suction-side stuffing box 1 is provided with a baffle ring 13 having an annular structure, which is hinged to the suction-side stuffing box 1, the suction-side stuffing box 1 is provided with a plurality of rust-proof springs 14 distributed circumferentially, and two ends of each rust-proof spring 14 are respectively connected to the inner wall of the baffle ring 13 and the sidewall of the suction-side stuffing box 1. The effect that sets up and keep off the flow ring 13 lies in can keeping out a part of fluid, reduces the impact of fluid to suction side packing letter body 1 or pump shaft 7, and then further reduces the erosion to pump shaft 7, makes this device have better environmental protection performance, has set up rust-resistant spring 14 and can cushion the impact force of fluid, comes the production of further noise abatement. In this embodiment, the front portion of the baffle ring 13 is an arc-shaped structure, which is used for guiding the fluid passing through.
The backflow phenomenon in the suction chamber can be avoided due to the limiting effect of the flow blocking ring 13, and the flow blocking ring 13 which moves due to backflow can be pulled under the effect of the antirust spring 14, so that the large deviation of the flow blocking ring 13 is avoided.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a suction structure of two casing radial subdivision multistage centrifugal pump which characterized in that: including outer barrel, suction side stuffing box, impeller and fix the first grade middle section on outer barrel, be equipped with the pump inlet on the outer barrel, the inside of outer barrel is equipped with the pump shaft rather than the coaxial setting, the impeller passes through the key-type connection to be fixed with the snap ring on the pump shaft, form annular suction chamber between suction side stuffing box and the first grade middle section.
2. The suction structure of the double-casing radially split multistage centrifugal pump according to claim 1, wherein: the suction side stuffing box body is provided with an annular suction chamber lower streamline, the side surface of the annular suction chamber lower streamline is provided with a noise reduction buffering pad, and the inside of the noise reduction buffering pad is filled with sound absorption cotton.
3. The suction structure of the double-casing radially split multistage centrifugal pump according to claim 2, wherein: the first-stage middle section is provided with an annular suction chamber upper streamline, and the annular suction chamber is positioned between the annular suction chamber upper streamline and the annular suction chamber lower streamline.
4. The suction structure of the double-casing radially split multistage centrifugal pump according to claim 3, wherein: the annular suction chamber may be formed by the rotation of the annular suction chamber lower streamline and the annular suction chamber upper streamline through 360 °.
5. The suction structure of the double-casing radially split multistage centrifugal pump according to claim 1, wherein: and a shell sealing ring is arranged on the first-stage middle section.
6. The suction structure of the double-casing radially split multistage centrifugal pump according to claim 1, wherein: the impeller is sleeved with an impeller sealing ring.
7. The suction structure of the double-casing radially split multistage centrifugal pump according to claim 4, wherein: the lateral wall of the suction side packing box body is provided with a flow blocking ring which is of an annular structure, the suction side packing box body is hinged to the suction side packing box body, the suction side packing box body is provided with a plurality of anti-rust springs which are distributed in a circumferential mode, and each anti-rust spring is connected to the two ends of each anti-rust spring respectively on the inner wall of the flow blocking ring and the lateral wall of the suction side packing box body.
8. A method of designing a suction structure of a double-casing radially split multistage centrifugal pump, which is used for the suction structure of the double-casing radially split multistage centrifugal pump described in any one of claims 1 to 7, characterized by comprising the steps of:
the method comprises the following steps: the annular suction chamber is simplified and can be formed by rotating the lower streamline of the annular suction chamber and the upper streamline of the annular suction chamber by 360 degrees;
step two: according to the design flow condition, the annular suction chamber is optimized by adopting a quintic-square Bezier curve in Solidworks software to generate an annular suction chamber fluid domain;
step three: drawing an impeller fluid domain by using Solidworks software;
step four: dividing an annular suction chamber and an impeller grid by ICEM CFD software;
step five: performing flow field analysis by CFX software;
step six: checking flow field analysis data by using post-processing software of CFX, and finding out the problem of the annular suction chamber;
step seven: optimizing the annular suction chamber by adopting a quintic-square Bezier curve in Solidworks software;
step eight: and judging whether the annular suction chamber has problems, if so, returning to the step two, repeating the step two to the step seven, and if not, obtaining the optimal annular suction chamber.
9. The design method of a suction structure of a double-casing radially split multistage centrifugal pump as claimed in claim 8, wherein: in step two, the Bezier curve formula is
。
10. The design method of a suction structure of a double-casing radially split multistage centrifugal pump as claimed in claim 8, wherein: in step six, the flow field analysis data may be flow line, velocity, pressure and efficiency.
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| CN202110154015.3A CN112727805A (en) | 2021-02-04 | 2021-02-04 | Suction structure of double-shell radial subdivision multistage centrifugal pump and design method thereof |
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| CN202110154015.3A CN112727805A (en) | 2021-02-04 | 2021-02-04 | Suction structure of double-shell radial subdivision multistage centrifugal pump and design method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114925481A (en) * | 2022-06-30 | 2022-08-19 | 江苏大学 | Hydraulic model library centrifugal pump performance improving method based on energy efficiency index |
| CN116658460A (en) * | 2023-07-13 | 2023-08-29 | 高邑县浩瀚金属制品有限公司 | Pump shell and pump based on fluid energy absorption buffer |
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