CN113719467B - Centrifugal pump combined seal with guard ring - Google Patents

Centrifugal pump combined seal with guard ring Download PDF

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Publication number
CN113719467B
CN113719467B CN202110846909.9A CN202110846909A CN113719467B CN 113719467 B CN113719467 B CN 113719467B CN 202110846909 A CN202110846909 A CN 202110846909A CN 113719467 B CN113719467 B CN 113719467B
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Prior art keywords
seal
retainer
blade
centrifugal
cover plate
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CN202110846909.9A
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CN113719467A (en
Inventor
王凯
鲍海峰
刘厚林
马皓晨
谈明高
王勇
董亮
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Jiangsu University
Zhenjiang Fluid Engineering Equipment Technology Research Institute of Jiangsu University
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Jiangsu University
Zhenjiang Fluid Engineering Equipment Technology Research Institute of Jiangsu University
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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
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
    • F04D29/448—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps bladed diffusers
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/06—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being hot or corrosive, e.g. liquid metals

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses a centrifugal pump combination seal with a retainer, which relates to the technical field of centrifugal pumps. The centrifugal sealing outlet is designed with a retainer which is arranged around the outlet of the auxiliary impeller, so that the counter pressure coefficient can be improved, the sealing performance is improved, the momentum exchange and the liquid friction moment along the outer diameter are reduced, and the power loss is further reduced. And a labyrinth sealing structure is formed between the retainer and the pump cover by arranging an annular groove, so that the sealing performance is further improved. The centrifugal pump combination seal with the retainer has wide applicability and high practical value in centrifugal pump seal design.

Description

Centrifugal pump combined seal with guard ring
Technical Field
The invention belongs to the technical field of centrifugal pumps, and particularly relates to a centrifugal pump assembly seal with a retainer.
Background
Leakage refers to the phenomenon of medium, such as gas, liquid, solid or mixtures thereof, entering one space into another and not being desirable, which is one of the three main sources of mechanical failure of modern equipment. The occurrence of leakage not only can cause energy waste, material loss and environmental pollution, but also can cause fire and explosion, directly endanger personal safety and bring huge economic loss. The pump is used as a fluid machine, the leakage problem is common, in order to prevent or reduce the leakage of high-pressure liquid in the pump along the axial direction, sealing measures are needed, and most common sealing methods include a packing seal, a mechanical seal and the like, but the packing seal has the defects of short service life and easy damage, and the mechanical seal has the problems of complex structure, high price and easy abrasion and failure during the transportation of a medium containing particles. The non-contact labyrinth seal and the centrifugal seal can overcome the defects of the packing seal and the mechanical seal, and can be used for the working conditions of high speed and high temperature and the transportation of corrosive media and media containing particles.
As pumps are gradually developed toward high speed, high pressure, etc., this also causes pump sealing to be developed toward high reliability and long life, and non-contact sealing such as labyrinth sealing, centrifugal sealing, etc., is receiving increasing attention.
Disclosure of Invention
The invention provides a centrifugal pump combination seal with a retainer, which realizes the sealing of a centrifugal pump through the combination of labyrinth seal and centrifugal seal.
The technical scheme adopted by the invention is as follows: the centrifugal pump assembly seal with the guard ring is characterized in that the mechanical structure of the seal comprises a rear cover plate, blades, the guard ring and a pump cover; the blade is located the back of back shroud, the retainer is located back outer fringe of back shroud, the pump cover is the part of the pump body.
As a further aspect of the invention, the back cover plate, the vanes, the retainer and the pump cover of the retainer centrifugal pump assembly seal together form a centrifugal seal and a labyrinth seal, and the centrifugal seal and the labyrinth seal together form a combined seal. The centrifugal seal adopts non-contact dynamic seal, the working process blade drives liquid to rotate, and the sealing is realized by utilizing the back pressure of the rotating liquid. The labyrinth seal is formed by an annular groove between the guard ring and the pump cover.
As a further proposal of the invention, the centrifugal pump with the guard ring is combined and sealed, and is characterized in that the blade is a straight blade or a backward bent blade, and a blade outletSetting angle beta 2 30-90 degrees, number of blades z=6-12, and blade width delta=0.01-0.03D hub Wherein D is hub For the diameter of the rear cover plate, the height h=1.0-2.0 delta, and the inner diameter D of the blade 1 ＝0.15～0.3D hub Blade outer diameter D 2 ＝0.8～0.98D hub The maximum pressure that dynamic seal can balance is:
Figure BDA0003180994150000011
Figure BDA0003180994150000021
where k is the backpressure coefficient k=0.8-0.9, ρ is the working medium density, ω is the impeller speed.
As a further aspect of the present invention, the centrifugal pump assembly seal with a retainer is characterized in that the retainer is located at the rear outer edge of the back cover plate, and surrounds the back cover plate along the outer edge thereof for one revolution, and the retainer thickness σ=0.5 (D hub -D 2 ) Axial height h of retainer c ＝2.0～3.0h。
As a further scheme of the invention, the centrifugal pump assembly with the guard ring is sealed, and is characterized in that an axial gap psi between the rear pump cover and the blades is 0.2-1.0 h, an annular groove is formed on the end face and is matched with the guard ring to form a labyrinth sealing structure, and the width of the annular groove is as follows
Figure BDA0003180994150000022
The annular groove depth alpha=1.0 to 2.0 sigma.
The beneficial effects of the invention are as follows:
the seal adopts a non-contact type, can overcome the defect of contact type seal, is especially suitable for the occasions where common seal is difficult to be qualified, such as high-speed, high-temperature, corrosive and solid particle-containing media and the like, and has the characteristics of simple structure, reliable seal and long service life.
The sealing design of combining the labyrinth sealing and the centrifugal sealing further improves the sealing performance and the reliability, and avoids the axial leakage of the centrifugal pump.
The design of the retainer in the seal can improve the back pressure coefficient of the common centrifugal seal, improve the sealing capacity, and simultaneously reduce the momentum exchange and the liquid friction moment along the outer diameter so as to reduce the power loss.
Drawings
FIG. 1 is a schematic view of a centrifugal pump assembly seal with a retainer;
FIG. 2 is a schematic view of a bladed disk, blade, and retainer in a centrifugal pump assembly seal with retainer.
Detailed Description
The invention will be further described with reference to the drawings and the specific embodiments, but the scope of the invention is not limited thereto.
As shown in figure 1, the seal is formed by combining a centrifugal seal and a labyrinth seal and comprises a rear cover plate, a blade, a retainer and a pump cover. The blade is located the back of back shroud, and the retainer is located back outer fringe of back shroud, and the pump cover is the part of the pump body. The centrifugal seal is a non-contact dynamic seal, the working process blades drive liquid to rotate, the sealing is realized by utilizing the back pressure of the rotating liquid, and the labyrinth seal is formed by an annular groove between the guard ring and the pump cover.
As shown in figure 2, the diameter of the rear cover plate of the impeller of the centrifugal pump is 260mm, the rated rotation speed is 2950rpm, the conveyed medium is sandy water, and the density is 1200kg/m 3 . The centrifugal sealing blade is a straight blade, and the blade outlet placement angle beta 2 Blade number z=8, blade width δ=5 mm, blade height h=8 mm, blade inner diameter D =90° 1 =50mm, blade outer diameter D 2 =250 mm, the maximum pressure P that the centrifugal seal can equilibrate to=0.77 MPa.
As shown in fig. 2, the retainer is located at the rear outer edge of the rear cover plate, and surrounds the rear outer edge of the rear cover plate, the thickness sigma=5mm of the retainer, and the axial height h of the retainer c The setting of retainer can improve back pressure coefficient, promotes sealing performance, reduces momentum exchange and liquid friction moment along external diameter department, and then reduces power loss.
As shown in figure 1, the axial clearance psi=3mm between the rear pump cover and the blades, the end face is provided with an annular groove which is matched with the retainer to form a labyrinth sealing structure, and the width of the annular groove is as follows
Figure BDA0003180994150000031
Annular groove depth α=7mm.
The examples are preferred embodiments of the present invention, but the present invention is not limited to the above-described embodiments, and any obvious modifications, substitutions or variations that can be made by one skilled in the art without departing from the spirit of the present invention are within the scope of the present invention.

Claims (2)

1. The centrifugal pump assembly seal with the retainer is characterized in that the mechanical structure of the seal comprises a rear cover plate, blades, the retainer and a pump cover; the blade is positioned on the back of the back cover plate, the guard ring is positioned on the outer edge of the back cover plate, and the pump cover is a part of the pump body; the back cover plate, the blades, the guard ring and the pump cover jointly form a centrifugal seal and a labyrinth seal, the centrifugal seal and the labyrinth seal jointly form a combined seal, the centrifugal seal is a non-contact dynamic seal, the blades drive liquid to rotate during operation, and the seal is realized by utilizing the back pressure of the rotating liquid; the labyrinth seal consists of an annular groove between the guard ring and the pump cover; the blade is a straight blade or a backward bent blade, and the blade outlet placement angle beta 2 30-90 degrees, number of blades z=6-12, and blade width delta=0.01-0.03D hub Wherein D is hub For the diameter of the rear cover plate, the height h=1.0-2.0 delta, and the inner diameter D of the blade 1 ＝0.15～0.3D hub Blade outer diameter D 2 ＝0.8～0.98D hub The maximum pressure that dynamic seal can balance is:
Figure FDA0004105841680000011
wherein k is a back pressure coefficient, k=0.8-0.9, ρ is the working medium density, ω is the impeller rotation speed; the retainer is positioned at the back outer edge of the back cover plate, and surrounds the back cover plate along the outer edge of the back cover plate, and the retainer thickness sigma=0.5 (D hub -D 2 ) Axial height h of retainer c ＝2.0～3.0h。
2. The flinger centrifugal pump assembly seal of claim 1, wherein the pumpThe axial clearance psi=0.2-1.0 h between the cover and the blades, the end face is provided with an annular groove which is matched with the retainer to form a labyrinth sealing structure, and the width of the annular groove
Figure FDA0004105841680000012
The annular groove depth alpha=1.0 to 2.0 sigma. />
CN202110846909.9A 2021-07-26 2021-07-26 Centrifugal pump combined seal with guard ring Active CN113719467B (en)

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Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB159785A (en) * 1920-05-27 1921-03-10 Fleming & Ferguson Ltd Improvements in centrifugal pumps
GB761421A (en) * 1953-10-07 1956-11-14 Escher Wyss Ag Improvements in or relating to labyrinth parking systems for use in turbines or pumps
GB1138607A (en) * 1965-02-25 1969-01-01 Dominion Eng Works Ltd Shroud seal for hydraulic turbines, pumps and like machines
CN102678608A (en) * 2011-03-11 2012-09-19 张家港市飞浪泵阀有限公司 Impeller sealing device
JP2013189916A (en) * 2012-03-13 2013-09-26 Mitsubishi Heavy Ind Ltd Pump, and mechanism for suppressing interference of pump leakage flow
CN102678615A (en) * 2012-04-25 2012-09-19 江苏尚宝罗泵业有限公司 Pump impeller with novel attached blades
CN204267308U (en) * 2014-12-07 2015-04-15 山东双轮股份有限公司 Centrifugal sewage pump

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