CN104963887B - A kind of impeller sealing structure for high speed and high pressure centrifugal pump - Google Patents

A kind of impeller sealing structure for high speed and high pressure centrifugal pump Download PDF

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Publication number
CN104963887B
CN104963887B CN201510411802.6A CN201510411802A CN104963887B CN 104963887 B CN104963887 B CN 104963887B CN 201510411802 A CN201510411802 A CN 201510411802A CN 104963887 B CN104963887 B CN 104963887B
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sealing
impeller
sealing ring
gap
radial clearance
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CN104963887A (en
Inventor
杨敏
马光辉
戴侃
于海力
王小华
邓晶
甄禛
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Beijing Aerospace Petrochemical Technology and Equipment Engineering Corporation
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BEIJING AEROSPACE PETROCHEMICAL TECHNOLOGY AND EQUIPMENT ENGINEERING Corp
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Abstract

The present invention proposes a kind of impeller sealing structure for high speed and high pressure centrifugal pump, and described impeller sealing structure is arranged between the pump housing and impeller, and the impeller sealing structure includes sealing ring, adjusting pad and soket head cap screw;Sealing ring is monocyclic, and the outer of sealing ring is fixed by soket head cap screw and adjusting pad with the pump housing;The sealing surface of sealing ring seals damping mode using pass, i.e., some circle circular holes are opened up on sealing surface;After described sealing ring is fixed with the pump housing, parallel twice gap, radial clearance one and radial clearance two are deposited in radial direction and impeller;After described sealing ring is fixed with the pump housing, there are three parallel road gaps, axial gap one, axial gap two and axial gap three with impeller in axial direction.The present invention has the axial gap of twice radial clearance and auxiliary, can substantially reduce leakage rate, improves the efficiency of pump.

Description

A kind of impeller sealing structure for high speed and high pressure centrifugal pump
Technical field
The present invention relates to a kind of high speed and high pressure centrifugal pump impeller sealing ring, it is proposed that a kind of new impeller sealing structure.
Background technology
High speed and high pressure centrifugal pump has the advantages that single-stage lift height, compact conformation, easy to maintenance and good reliability, extensive Applied in the civil area such as field of aerospace technology and oil, chemical industry.
Sealing ring is sealing essential between impeller and the pump housing (suction chamber) in centrifugal pump, friction member.Sealing ring Frictional behavior and life-span directly affect the economical and reliability of centrifugal pump.If the running clearance at sealing ring is excessive, from impeller The water under high pressure of middle outflow will leak back into the import of impeller by the gap, reduce the water yield of pump, reduce the efficiency of pump;But When gap is too small, though water leakage can be reduced, mechanical friction can be caused, also easily cause the irregular operation of pump.The type of sealing ring Formula has monocyclic, dicyclic and labyrinth type, sees Fig. 1, it is best that labyrinth collar subtracts leakage effect.The most frequently used seals for monocyclic Ring, can be divided into two kinds of straight formula and end-surface type, and its is simple in construction, manufacture and easy for installation, sees Fig. 2.Straight formula sealing ring is main By radial clearance seals, end-surface type sealing ring is sealed mainly by axial gap.
Effective control of running clearance plays most important to the efficiency, service life and the stability of a system of pump at sealing ring Effect.The determination of running clearance at sealing ring, is considered as pumping temperature, suction condition, property, the heat of material for conveying liquid Expansion and occlusion characteristic, the efficiency of pump and rotor stability.Gap is sufficiently large, reliable under all regulation operating modes to ensure Operate and avoid occlusion.Advanced Seal Design and material selection are played a very important role to effectively control gap.The U.S. Metal seal ring needs are suggested in institute of Petroleum's oil, weight chemistry and gas industrial centrifugal pump standard (API610) Minimum running clearance.For there is nonmetallic seal ring material very low or without occlusion trend, less fortune can be used Turn gap.
At present, the sealing ring of general centrifugal pump generally use cast iron or other metal materials, for ensure operating reliability and Occlusion is avoided, all using larger running clearance, the efficiency of pump can be substantially reduced.For high speed and high pressure centrifugal pump, metal material The running clearance of sealing ring is bigger, and efficiency reduction is more obvious, reduces the economy of pump.
The performance indications of sealing ring do not require nothing more than leakage rate and control lower, also require that sealing system can guarantee that or strengthen and turn The stability of subsystem.While being sealed in of express pump prevents that fluid from leaking, important fluid exciting force can be also produced, so that Influence the stability of rotor.
The content of the invention
The purpose of the present invention is to propose to a kind of impeller sealing structure for high speed and high pressure centrifugal pump, multiple-aspect control operating Gap, effectively control leakage, improves the efficiency of pump, while improving the stability of rotor using damping seal technology.
Realize the technical scheme of the object of the invention:A kind of impeller sealing structure for high speed and high pressure centrifugal pump, it is described Impeller sealing structure is arranged between the pump housing and impeller, and the impeller sealing structure includes sealing ring, adjusting pad and soket head cap screw; Sealing ring is monocyclic, and the outer of sealing ring is fixed by soket head cap screw and adjusting pad with the pump housing;The sealing surface of sealing ring is adopted Damping mode is sealed with pass, i.e., some circle circular holes are opened up on sealing surface;After described sealing ring is fixed with the pump housing, radially Parallel twice gap, radial clearance one and radial clearance two are deposited with impeller;After described sealing ring is fixed with the pump housing, in axial direction There are three parallel road gaps, axial gap one, axial gap two and axial gap three with impeller.
Between a kind of impeller sealing structure for high speed and high pressure centrifugal pump as described above, the radial clearance one described in it Gap a1 takes 1/2 of metal material minimum running clearance recommended value in API610 standards;The gap a2 of described radial clearance two takes The recommended value of metal material minimum running clearance in API610 standards.
A kind of impeller sealing structure for high speed and high pressure centrifugal pump as described above, the position of the radial clearance one described in it Put and should ensure that impeller cover meets intensity requirement, the length of radial clearance one and radial clearance two can be consistent, radial clearance One and radial clearance two distance according between impeller and the pump housing space size determine.
A kind of impeller sealing structure for high speed and high pressure centrifugal pump as described above, the axial gap one described in it, axle Determined to the gap b of gap two and axial gap three according to the amount of altering of shafting, in the range of 0.25~0.53mm.
A kind of impeller sealing structure for high speed and high pressure centrifugal pump as described above, the sealing ring described in it is nonmetallic Material polyether-ether-ketone resin.
A kind of impeller sealing structure for high speed and high pressure centrifugal pump as described above, the sealing ring described in it is carbon fiber Enhanced polyether-ether-ketone resin.
A kind of impeller sealing structure for high speed and high pressure centrifugal pump as described above, the sealing in sealing ring described in it Some circle circular holes opened up on face, the gross area of its circular hole accounts for the 60%~70% of the sealing surface gross area of sealing ring.
Effect of the invention is that:A kind of impeller sealing structure for high speed and high pressure centrifugal pump of the present invention, has The axial gap of twice radial clearance and auxiliary, can substantially reduce leakage rate, improve the efficiency of pump.It is poly- using nonmetallic materials The radial direction running clearance of the sealing ring of ether ether ketone (PEEK) resin can reduce half, can both increase reliability of operation, again Leakage rate can be reduced, efficiency is improved.Due to being provided with circular hole on sealing surface, make to be sealed with larger damped coefficient, while can also Weaken the circumferential flow in sealing, and then reduce sealedly intersection rigidity, strengthen the stability of rotor.
Brief description of the drawings
Fig. 1 is the structure chart of mononuclear type (a), double ring type (b) and labyrinth type (c) sealing ring;
Fig. 2 is the structure chart of straight formula (a) and end-surface type (b) single-ring seal ring;
Fig. 3 is seal ring structure figure of the invention.
Fig. 4 is pass sealing surface schematic diagram of the invention.
In figure:1. the pump housing;2. it is set in the sealing ring on the pump housing;3. impeller;4. it is set in the sealing ring on impeller;5. in hexagonal Screw;6. adjusting pad;7. sealing ring.
Embodiment
It is close to a kind of impeller for high speed and high pressure centrifugal pump of the present invention with specific embodiment below in conjunction with the accompanying drawings Seal structure is further described.
As shown in Figure 3 and Figure 4, a kind of impeller sealing structure for high speed and high pressure centrifugal pump of the present invention is arranged on Between the pump housing 1 and impeller 3.The impeller sealing structure includes sealing ring 7, adjusting pad 6 and soket head cap screw 5.
Sealing ring 4 is monocyclic, and the outer of sealing ring 4 is fixed by soket head cap screw 5 and adjusting pad 6 with the pump housing 1;Sealing The sealing surface of ring 4 seals damping mode using pass, i.e., some circle circular holes (such as 2 circle circular holes, 3 circle circles are opened up on sealing surface Hole or 4 circle circular holes).The gross area of these circular holes accounts for the 60%~70% of the sealing surface gross area of sealing ring 4.
After described sealing ring 7 is fixed with the pump housing 1, there is twice gap, the I of radial clearance one and footpath in radial direction and impeller 3 To the II of gap two.The I of radial clearance one gap a1 takes 1/2 of metal material minimum running clearance recommended value in API610 standards; The described II of radial clearance two gap a2 takes the recommended value of metal material minimum running clearance in API610 standards.
The I of radial clearance one position should ensure that impeller cover meets intensity requirement, the I of radial clearance one and the II of radial clearance two Length can be consistent, the I of radial clearance one and the II of radial clearance two distance is according to the size in space between impeller and the pump housing It is determined that.
After described sealing ring 7 is fixed with the pump housing 1, there are three road gaps, the III of axial gap one, axle in axial direction and impeller 3 To the IV of gap two and the V of axial gap three.The III of axial gap one, the IV of axial gap two and the V of axial gap three gap b are according to axle The amount of altering of system is determined, in the range of 0.25~0.53mm.
Described sealing ring 4 is nonmetallic materials polyether-ether-ketone resin, for example:The polyether-ether-ketone resin of fibre reinforced.
It is monocyclic that loop type is sealed in the present invention, subtracts leakage by the axial gap of twice radial clearance and auxiliary, sees Shown in Fig. 3.The stability of rotor is improved using pass damping seal technology, as shown in Figure 4.It is close for what is axially worn and torn Seal ring, can ensure axial gap by way of increasing adjusting pad, it is not necessary to change sealing ring, save cost.

Claims (6)

1. a kind of impeller sealing structure for high speed and high pressure centrifugal pump, described impeller sealing structure be arranged on the pump housing (1) and Between impeller (3), it is characterised in that:The impeller sealing structure includes sealing ring (7), adjusting pad (6) and soket head cap screw (5); Sealing ring (4) is monocyclic, and the outer of sealing ring (4) is fixed by soket head cap screw (5) and adjusting pad (6) and the pump housing (1);It is close The sealing surface of seal ring (4) seals damping mode using pass, i.e., some circle circular holes are opened up on sealing surface;
After described sealing ring (7) is fixed with the pump housing (1), parallel twice gap, radial clearance one are deposited with impeller (3) in radial direction And radial clearance two (II) (I);
After described sealing ring (7) is fixed with the pump housing (1), there are three parallel road gaps, axial gap with impeller (3) in axial direction One (III), axial gap two (IV) and axial gap three (V);
The described some circle circular holes opened up on the sealing surface of sealing ring (4), the gross area of its circular hole accounts for the close of sealing ring (4) The 60%~70% of the front cover gross area.
2. a kind of impeller sealing structure for high speed and high pressure centrifugal pump according to claim 1, it is characterised in that:It is described The gap a1 of radial clearance one (I) take the 1/2 of the minimum running clearance recommended value of metal material in API610 standards;Described footpath The recommended value of metal material minimum running clearance in API610 standards is taken to the gap a2 of gap two (II).
3. a kind of impeller sealing structure for high speed and high pressure centrifugal pump according to claim 1, it is characterised in that:It is described The position of radial clearance one (I) should ensure that impeller cover meets intensity requirement, radial clearance one (I) and radial clearance two (II) Length can be consistent, the distance of radial clearance one (I) and radial clearance two (II) is according to space between impeller and the pump housing Size is determined.
4. a kind of impeller sealing structure for high speed and high pressure centrifugal pump according to claim 1, it is characterised in that:It is described Axial gap one (III), the gap b of axial gap two (IV) and axial gap three (V) determined according to the amount of altering of shafting, In the range of 0.25~0.53mm.
5. a kind of impeller sealing structure for high speed and high pressure centrifugal pump according to claim 1, it is characterised in that:It is described Sealing ring (4) be nonmetallic materials polyether-ether-ketone resin.
6. a kind of impeller sealing structure for high speed and high pressure centrifugal pump according to claim 1, it is characterised in that:It is described Sealing ring (4) be fibre reinforced polyether-ether-ketone resin.
CN201510411802.6A 2015-07-14 2015-07-14 A kind of impeller sealing structure for high speed and high pressure centrifugal pump Active CN104963887B (en)

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Application Number Priority Date Filing Date Title
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CN104963887B true CN104963887B (en) 2017-08-18

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110185652A (en) * 2019-06-18 2019-08-30 泰州市罡阳喷灌机有限公司 A kind of wear-resisting choma production method of liquid-ring type self priming pump

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* Cited by examiner, † Cited by third party
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US4815747A (en) * 1988-02-01 1989-03-28 The Gorman-Rupp Company Face type seal assembly
CN2086335U (en) * 1991-01-31 1991-10-09 临清市石油机械厂 Differential pressure seal device of centrifugal pump
CN100504072C (en) * 2007-07-31 2009-06-24 陕西航天动力高科技股份有限公司 Centrifugal pump mouth ring sealing device
CN201106576Y (en) * 2007-07-31 2008-08-27 陕西航天动力高科技股份有限公司 Apparatus for sealing centrifugal pump mouth loop
CN202417952U (en) * 2011-12-14 2012-09-05 陕西航天动力高科技股份有限公司 High-flow high/low-pressure multistage centrifugal pump
CN104389809A (en) * 2014-09-11 2015-03-04 诸文伟 Integrated mechanical seal for pump

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