CN109751278A - The method and device of thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal - Google Patents
The method and device of thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal Download PDFInfo
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- CN109751278A CN109751278A CN201811510655.8A CN201811510655A CN109751278A CN 109751278 A CN109751278 A CN 109751278A CN 201811510655 A CN201811510655 A CN 201811510655A CN 109751278 A CN109751278 A CN 109751278A
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Abstract
A kind of method of thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal, comprising steps of S1, between stationary seat flange and water pump stuffing box body end face plus one piece of two sides is the oval ring spacing board and an expanded PTFE gasket of smooth seal plane, and stationary seat flange face and spacing board binding face are equipped with O-shaped rubber seal；If stuffing box body end face has tilt phenomenon to keep mechanical sealing flange face and pump shaft axis verticality unqualified, two plane machinings of spacing board are with corresponding angle；Or: if two halves are not concordant above and below stuffing box body end face, the corresponding surface of spacing board is processed as male and fomale(M&F) and compensates not concordant stuffing box body end face；It should finally make mechanical sealing static ring seat flange qualified to the verticality of pump shaft axis；The spring driven ring side of mechanical seal is changed to stationary ring side by S2, and expands the spring diameter that stationary seat spring socket sleeve increases 1~2 grade.Mechanical seal leakage of the invention simultaneously extends the service life, reduces maintenance and operating cost.
Description
Technical field
The present invention relates to a kind of methods of thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal.The invention further relates to one
The device of kind thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal.
Background technique
The axle envelope leakage problem of rotating machinery is always the popular problem that the relevant industries such as electric power, chemical industry compare concern.By
In historical reasons, these industries still have a large amount of in-service soft packing seal water pumps or other delivery pumps, the soft packing of these water pumps
The problems such as sealing certainly exists leakage, energy consumption is high.In China, many large thermal power plant pure condensate wet type cooling unit production times all compare
Long, the primitive axis seal structure of many low-pressure pumps is packing_seal, successively that these water pumps or delivery pump are soft after 2002
Packing shaft seal transform integrated mechanical sealing as to improve the sealing performance of equipment and energy consumption, realizes No leakage low energy consumption factory
Target.
But after being transformed, the problems such as finding new mechanical seal structure short there are various problems, especially service life, easy leakage, is prominent
Out.
For example, Sha Jiao A power plant there are 3 210MW and 2 330MW pure condensate wet type cooling units at present, go into operation more than 20 years, 210MW
Defect remains high in operation for the mechanical seal of the industrial water pump of the water-jet pump of unit, low-pressure heater and drainage pump and 330MW unit, more
It is normal to change mechanical seal Initial operation, but 1 month or so slip of operation is higher, mechanical seal replacing is frequent.Producer technology people
Member repeatedly improves installation method to on-the-spot guidance service personnel, and has carried out technology according to feedback opinion to mechanical seal product and changed
Into.But 2014 leakage rate per years are still higher, only the 6 of 210MW unit water-jet pump just occurs 8 times because mechanical seal is replaced in leakage
Defect, the short problem of the service life of mechanical seal are not solved effectively.Power plant in view of such mechanical seal operational reliability compared with
It is low, it has to implement to shift to an earlier date for every 1~2 year changing machine envelope to reduce leakage failure rate.
By studying Principle of Mechanical Designing, pump body structure and defect processing historical summary repeatedly, and it is close to defect machinery
Envelope disintegrated, classification analysis, discovery common feature be mechanical seal spring breakage or deformation it is serious, but dynamic and static ring is intact.
Summarizing reason is that stuffing box structure is adapted to not perfect, mechanical seal installation, type selecting has spring design stress deficiency.
Machine seals three aspect reason of spring breakage:
1) mechanical sealing static ring seat flange and packing box seal clamp force are uneven.The soft packing letter body of soft packing seal design
End face be elliptical shape can not arrange that quadrangle or hexagonal symmetrically connect bolt, can only arrange two to corner bolt tightening stationary seat
Flange.In this case stationary seat flange two connection tightened bolt presses stationary seat flanges and pump stuffing box body end face when,
Bolt vertical line direction side may glance off phenomenon, be unable to ensure the entire sagittal plane of mechanical sealing static ring seat flange and axis hangs down
Directly, make the dynamic and static part verticality of mechanical seal unqualified, mechanical sealing linkage ring is not let out sternly with the conjunction of stationary ring functional contact face paste
Dew.To ensure the sealing performance after stationary seat flange is connect with stuffing-box, we design mechanical sealing static ring seat flange shape with
Stuffing box body end face is equally ellipse, makes to become elliptical long focus at screw, is conducive to reinforce stationary seat elliptic method in this way
The clamp force of blue short focus point side is to obtain sealing performance.But this design can only partly solve sealing problem, be unable to ensure method
Plane and axis exact vertical after orchid connection fastening.It such as thoroughly to solve both of these problems and only replace whole water pump, be not achieved
The purpose of save the cost is transformed；
2) original stuffing-box (shaft seal cavity) end face part out-of-flatness.Due to original axle envelope soft packing letter end face and soft packing
For gland without contact, so most of stuffing box body end face processing is relatively rough, and most stuffing-boxes are middle open type, entire flat
The uneven phenomenon in face is prominent, and two halves have a step phenomenon up and down in partial filler letter body end face, in addition entire end face exist relative to
Axis deviation phenomenon.Therefore the conventional seals gasket compression amount for working as installation is too small, especially the short elliptical focus of stationary seat flange
Place, stress is minimum, and clamp force can not cover non-uniform coarse stuffing box body end face, will lead to after mechanical seal cover is fixed and seals
Face leakage；There are the stuffing box body end faces of step or tilt phenomenon, and stationary seat Flange Plane also to be made not hang down with axis for entire end face
Directly, the concentricity of sound component changes inside mechanical seal, and military order mechanical seal moving part and quiet part are in contact abrasion, together
The kink of minor diameter Packing spring, fracture in Shi Zaocheng compact rotating ring cover for seat.It is sent outside as entire water pump is disassembled from basis
Prepared filler letter body end face, at high cost and duration are too long.
3) former mechanical seal design is unreasonable.Soft packing letter internal geometric size is small, contains the narrow space of mechanical seal,
Therefore mechanical sealing linkage ring seat must be made compact, and otherwise easily touch mill stuffing-box inner wall.Preliminary improved mechanical seal is pressed
Confidential ask of more solito mesolow, low speed rotation compensates pattern using rotating ring.The rotating ring of these mechanical seals is in compact rotating seat
In set can only axial displacement, so more harsh to the required precision of dynamic and static ring position.In addition spring, spring are contained in rotating seat
The parts such as guard ring, therefore opposite stationary ring compensates pattern rotating seat, the rotating seat geometric dimension that rotating ring compensates pattern is larger.Therefore work as
When the concentricity of axis and stuffing-box, the error of perpendicularity are slightly larger, the dynamic and static component of mechanical seal will be made mutually to touch mill, especially only
The mechanical seal spring that axial stress is born in design is also turned round shear force by the radial of strong variations；And it is larger in view of working as revolving speed
When, the centrifugal stress that the spring at rotating ring is subject to also increases accordingly, and causes the mechanical seal spring breakage possibility twisted together
It increases, keeps mechanical seal working life short.
Summary of the invention
First technical problem to be solved by this invention is just to provide a kind of thermal power plant's pure condensate wet type cooling unit low-pressure pump
The method of mechanical seal.
Second technical problem to be solved by this invention is just to provide a kind of thermal power plant's pure condensate wet type cooling unit low-pressure pump
The device of mechanical seal.
Using methods and apparatus of the present invention, the mechanical sealing effect of thermal power plant's pure condensate wet type cooling unit low-pressure pump is good
No leakage significantly extends the mechanical seal service life, significantly reduces maintenance cost and operating cost, and installation method is simply easy
Row.
Above-mentioned first technical problem is solved, the technical solution adopted in the present invention is as follows:
A kind of method of thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal, it is characterized in that the following steps are included:
S1, stationary seat flange are fixedly connected with asymmetric and stuffing box body end face out-of-flatness processing with water pump stuffing box body end face
Between stationary seat flange and water pump stuffing box body end face plus one piece of two sides is the oval ring of smooth seal plane
Cooperate a piece of expanded PTFE gasket, stationary seat flange on spacing board, with the binding face of water pump stuffing box body end face again
Face and spacing board binding face are equipped with O-shaped rubber seal；
If stuffing box body end face have the axis verticality of tilt phenomenon and water pump it is unqualified when, described spacing board two are flat
Face is processed as having corresponding angle；Or: if two halves are not concordant above and below stuffing box body end face, the correspondence of the spacing board
Face is processed as male and fomale(M&F) and compensates not concordant stuffing box body end face；It should finally make mechanical sealing static ring seat flange to water pump in a word
Axis verticality it is qualified, meet the dynamic and static component concentricity of mechanical seal and verticality requirement.
S2, the short issue handling of mechanical seal service life
It is thicker using stationary seat flange so the larger feature in inner space, the spring driven ring side of mechanical seal is changed to
Stationary ring side, and expand the spring diameter that stationary seat spring socket sleeve increases 1~2 grade.
Preferably, the spacing board recommends 12mm when tapered require with a thickness of 10mm.
Soft and tough and tensile expanded PTFE patch applications energy on stuffing box body end face that is uneven or having abrasion
Reliable sealing performance is provided, thus guarantee entire pump stuffing box body end face circumference only diagonal two connections bolt when also can with it is new
The spacing board sealing performance of configuration is reliable；Groove on the mechanical seal cover of other side smooth flat cooperation ellipse, encloses O
Type rubber seal is realized to be sealed between gland and spacing board.New fastening structure technology not only ensure that pump stuffing-box side seal, but also
It may insure that stationary seat flange (referred to as stationary seat flange when original installing gasket) and axis vertically ensure that the close of mechanical seal
Sealing property.
If stuffing box body end face has slight inclination phenomenon and pump shaft axis verticality to have error or pump shaft to turn in high speed
When having slight flexure in dynamic, the rotating ring of the mechanical seal of stationary ring compensation pattern is able to maintain sealing surface with stationary ring and is bonded, and finally makes
Mechanical seal leakage of the invention；Simultaneously increase 1~2 grade spring diameter and stationary state under be not subjected to rotation centrifugation
Spring reliability, the ability to work of power significantly increase；Finally make mechanical seal leakage of the invention and extend the service life, drops
Low maintenance and operating cost, and installation method is simple and easy.
Above-mentioned second technical problem is solved, the technical solution adopted in the present invention is as follows:
A kind of device of thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal, it is characterized in that including:
Axle sleeve 11 covers on the axis 21 of the water pump and outside the end face of stuffing box body 20 for stretching out the water pump, with axis
1 radial seal of the first O-ring seal is equipped between 21；
Rotating seat 2 covers on the axle sleeve 11, and its rear end is externally provided with outer lug boss, front end is stretched out outside stuffing box body end face；
Rotating ring 18 is sleeved on the front on the rotating seat 2, between the two simultaneously by 4 end face seal of the second O-ring seal
Relatively fixed by latch 3, there are gaps, and the two can be relatively rotated between stuffing box body inner cavity and rotating seat；
Positioning ring 13 covers on the front end of the rotating seat 2, passes through sunk screw 12 from positioning ring 13 for rotating seat 2
Front end is fixed on 11 front end of axle sleeve and forms a suit component；
Stationary seat flange 7 covers outside the front end of the rotating seat 2, and between the two there are cavity, the front end of inner hole is inside
Cyclic annular internal shoulder；
Stationary ring 16 is mounted in the stationary seat flange 7 and the cavity of rotating seat 2 between the two, with stationary seat method
15 end face seal of the 3rd O sealing ring is equipped between orchid 7；
Spring 8 is located between the internal projecting ring of the 7 inner hole front end of front end face and stationary seat of the stationary ring 16 and pushes stationary ring；
Stationary ring pin 14 is located between the internal projecting ring of the 7 inner hole front end of front end face and stationary seat of the stationary ring 16 and fixes stationary ring；
Spacing board 5 is located at the mechanical sealing static ring for the smooth oval ring plate in two sides of corresponding stuffing box body end face
Between seat flange and the stuffing box body end face of pump；
Expanded PTFE gasket 17 is located between the binding face of the stuffing box body end face of the spacing board 5 and pump；
The mechanical sealing static ring seat flange face and spacing board binding face is equipped with the 4th O-shaped rubber seal 6；
When the stuffing box body end face have tilt phenomenon and water pump axis verticality it is unqualified when, the spacing board 5
Two planes have corresponding angle；Or: when two halves are not concordant above and below stuffing box body end face, pair of the spacing board 5
Answering face is the male and fomale(M&F) that can compensate not concordant stuffing box body end face just；It should finally make mechanical sealing static ring seat flange 7 right
The verticality of pump shaft is qualified, meets the dynamic and static component concentricity of mechanical seal and verticality requirement.
Preferably, being fixed on the positioning ring 13 by clamp force adjustment ring dowel 10 can the dynamic clamp force tune of axial displacement
The domain 9, can the dynamic clamp force adjustment ring 9 of axial displacement can connect, adjust rotating seat and quiet part seat relative position, make in stationary ring cover for seat
Spring-compressed, elastic force, which heads on stationary ring and is bonded with the rotating ring contact surface of the other side, reaches sealing effect.
Preferably, the spacing board 5 and stationary seat flange 7 pass through two bolt fixing seals being arranged symmetrically.
Preferably, the cover for seat internal shoulder of the stationary seat is inserted with the spring of 10~16 diameter 3.6mm, and spring at front end is set
There is spring retainer capable of sliding back and forth.The effect of spring retainer is that the elastic force of each spring is equably passed to stationary ring.
Preferably, rotating ring guard ring 19 is equipped with inside the outer lug boss on the rotating seat 2.
Beneficial effects of the present invention: for example, before transformation, there are industrial water pump 12, drainage pump 6, jetting in Sha Jiao A factory
The mechanical seal of totally 24 low-pressure pumps of pump 6 needs to change 15/year because of daily defect, and every preventative maintenance in 2 years needs to change 24
A/year.It after transformation, essentially eliminates because of daily defect-found replacement quantity, preventative maintenance is replaced altogether during being only arranged in overhaul in 4 years
24/year.
4500 yuan of mechanical seal price, the maintenance cost of one mechanical seal of every replacement is by 2000 yuan of calculating, maintenance before being transformed
Cost: (15+24+15+24) × (4500+2000)=507000 yuan/4 years.Maintenance cost after transformation: 24 × (4500+2000)
=156000 yuan/4 years.It is annual to save maintenance cost: (507000-156000) ÷ 4=87750 member/year.
By transformation, the improvement cost that can save mechanical seal every year is 87750 yuan, significantly reduces the dimension of low-pressure pump
Shield and operation use cost.This time comprehensive treatment completely eliminates water-jet pump, drainage pump, industrial water pump these three types low pressure water pump machine
Tool seals the security risk that frequent leak needs termination of pumping to replace, the especially mechanical seal of jetting pump group and leaks.
The sealing effect of mechanical seal of the invention is good, it is ensured that No leakage, substantially drops at significant prolonged mechanical sealing life
The maintenance cost and operating cost of low water pump.Improved mechanical sealing effect is good, and installation method is simple and easy, is worth complete
Domestic a wide range of popularization and application.
(1) seal face part out-of-flatness after the transformation mechanical seal of old water pump packing seal chamber, solid is pointedly solved
Surely circumference asymmetry problem is connected, thoroughly solve the hidden danger of the various leakages of mechanical seal and extends improved mechanical seal
Working life.
(2) by rotating ring collocation structure being changed to the mechanical seal of stationary ring collocation structure, arrangement spring works machine is expanded
The spring diameter of original size is increased two times by the space of structure, and mechanical seal is because spring bears to shear after thoroughly solving transformation
Power leads to greatly the problem of being even broken of splashing in operation, and the medium and small water pump that stationary ring compensation way also makes axial velocity high generates
Sealing surface keeps fitting when shaft flexing, it is ensured that the working effect of mechanical seal.
Detailed description of the invention
Fig. 1 is that (spring is straight for the mechanical seal structure schematic cross-sectional view of thermal power plant's pure condensate wet type cooling unit low-pressure pump after transformation
Diameter 3.6mm)；
Fig. 2 is the partial right side view of Fig. 1；
There are expanded PTFE gasket compensation effects when wear surface, nonuniform plane for the stuffing box body end face that Fig. 3 is Fig. 1
Fruit partial enlargement diagram；
Fig. 4 is spacing board main view；
Fig. 5 is spacing board cross-sectional view；
Fig. 6 is spacing board schematic cross-sectional view when misalignment has step above and below stuffing box body end face；
Fig. 7 be when stuffing box body end face have tilt phenomenon and pump shaft verticality it is unqualified when spacing board section view illustrate
Figure；
Fig. 8 be when stuffing box body end face have tilt phenomenon and pump shaft verticality it is unqualified when plus spacing board compensation imitate
Fruit schematic diagram.
Appended drawing reference refers in figure:
The first O-ring seal of 1-；
2- rotating seat；
3- rotating ring latch；
The second O-ring seal of 4-；
5- spacing board；
The O-shaped rubber seal of 6- the 4th；
7- stationary seat flange；
8- spring；
9- clamp force adjustment ring；
10- clamp force adjusts ring dowel；
11- axle sleeve；
12- sunk screw；
13- positioning ring；
14- stationary ring pin；
15- third O-ring seal；
16- stationary ring；
17- expanded PTFE gasket；
18- rotating ring；
19- rotating ring guard ring；
20- stuffing box body；
21- pump shaft.
Specific embodiment
Referring to Fig. 1 to Fig. 8, the embodiment of the method for thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal of the invention,
The following steps are included:
S1, stationary seat flange are fixedly connected with asymmetric and stuffing box body end face out-of-flatness processing with water pump stuffing box body end face
Between stationary seat flange and water pump stuffing box body end face plus one piece of two sides is the oval ring of smooth seal plane
Again with unification expanded PTFE gasket, stationary seat flange face on spacing board 5, with the binding face of water pump stuffing box body end face
O-shaped rubber seal is equipped with spacing board binding face；
If stuffing box body end face have tilt phenomenon and water pump axis verticality it is unqualified when, described two planes of spacing board
It is processed as that there is corresponding angle；Or: if two halves are not concordant above and below stuffing box body end face, the corresponding surface of the spacing board
It is processed as male and fomale(M&F) and compensates not concordant stuffing box body end face；It should finally make mechanical sealing static ring seat flange to pump shaft in a word
The verticality of line is qualified, meets the dynamic and static component concentricity of mechanical seal and verticality requirement.
S2, the short issue handling of mechanical seal service life
It is thicker using stationary seat flange so the larger feature in inner space, the spring driven ring side of mechanical seal is changed to
Stationary ring side, and expand the spring diameter that stationary seat spring socket sleeve increases 1~2 grade.
Preferably, spacing board recommends 12mm when tapered require with a thickness of 10mm.
The Installation practice of thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal of the invention includes:
Axle sleeve 11 covers on the axis 21 of the water pump and outside the end face of stuffing box body 20 for stretching out the water pump, with axis
1 radial seal of the first O-ring seal is equipped between 21；
Rotating seat 2 covers on the axle sleeve 11, and its rear end is externally provided with outer lug boss, front end is stretched out outside stuffing box body end face；
Rotating ring 18 is sleeved on the front on the rotating seat 2, between the two simultaneously by 4 end face seal of the second O-ring seal
Relatively fixed by latch 3, there are gaps, and the two can be relatively rotated between stuffing box body inner cavity and rotating seat；
Positioning ring 13 covers on the front end of the rotating seat 2, passes through sunk screw 12 from positioning ring 13 for rotating seat 2
Front end is fixed on 11 front end of axle sleeve and forms a suit component；
Stationary seat flange 7 covers outside the front end of the rotating seat 2, and between the two there are cavity, the front end of inner hole is inside
Cyclic annular internal shoulder；
Stationary ring 16 is mounted in the stationary seat flange 7 and the cavity of rotating seat 2 between the two, with stationary seat method
15 end face seal of the 3rd O sealing ring is equipped between orchid 7；
Spring 8 is located between the internal projecting ring of the 7 inner hole front end of front end face and stationary seat of the stationary ring 16 and pushes stationary ring；
Stationary ring pin 14 is located between the internal projecting ring of the 7 inner hole front end of front end face and stationary seat of the stationary ring 16 and fixes stationary ring；
Spacing board 5 is located at the mechanical sealing static ring for the smooth oval ring plate in two sides of corresponding stuffing box body end face
Between seat flange and the stuffing box body end face of pump；
Expanded PTFE gasket 17 is located between the binding face of the stuffing box body end face of the spacing board 5 and pump；
Mechanical sealing static ring seat flange face and spacing board binding face are equipped with the 4th O-shaped rubber seal 6；
When the stuffing box body end face have tilt phenomenon and water pump axis verticality it is unqualified when, the spacing board 5
Two planes have corresponding angle；Or: when two halves are not concordant above and below stuffing box body end face, pair of the spacing board 5
Answering face is the male and fomale(M&F) that can compensate not concordant stuffing box body end face just；It should finally make mechanical sealing static ring seat flange 7 right
The verticality of pump shaft is qualified, meets the dynamic and static component concentricity of mechanical seal and verticality requirement.
On positioning ring 13 by clamp force adjust ring dowel 10 be fixed with can the dynamic clamp force adjustment ring 9 of axial displacement, can be axial
The dynamic clamp force adjustment ring 9 of displacement can connect, adjust rotating seat and quiet part seat relative position, make the spring-compressed in stationary ring cover for seat,
Elastic force, which heads on stationary ring and is bonded with the rotating ring contact surface of the other side, reaches sealing effect.
Spacing board 5 and stationary seat flange 7 pass through two bolt fixing seals being arranged symmetrically.The cover for seat internal shoulder of stationary seat
It is inserted with the spring of 10~16 diameter 3.6mm, spring at front end is equipped with spring retainer capable of sliding back and forth.The effect of spring retainer is
The elastic force of each spring is equably passed to stationary ring.Rotating ring guard ring 19 is equipped with inside outer lug boss on rotating seat 2.
When installation, firstly, the water pump cover to upper and lower two halves carries out registration process, it is ensured that the greatest extent may be used two sides stuffing box body end face
It can be concordant.Alignment finishes between pump body top cover and the pump housing brill vertical pin hole, and squeezes into vertical pin and ensure after pump cover is aligned with the pump housing in work
Make to position under state constant.
Secondly, check alignment after stuffing box body end face plane degree, it is alternatively that the thickness of expanded PTFE gasket according to
According to, it is uneven to end face it is serious should do filing surface processing, then choose thicker expanded PTFE gasket, such as 3
~4mm, using expanded PTFE gasket resilience is good, compression ratio is high, flexible toughness can good feature, realize to wear surface,
The sealing of nonuniform plane.
The verticality of stuffing box body end face and axis, the basis as working interval plate shape and structure are measured again.It fills out
Letter body end face is expected basically perpendicular to axis, and spacing board is processed as simple symmetric uniformly oval slab；To stuffing box body end face
There are step, the oval slab of corresponding working interval plate compensation step shape；When stuffing box body end slope is when axis, interval
Plate can be processed as corresponding taper slab.Spacing board machining shape under the various states as shown in Fig. 5, Fig. 6 and Fig. 7.By each
The slab of kind compensation shape is, it can be achieved that the stationary seat side plane of spacing board is perpendicular to the axis always, it is ensured that the dynamic and static portion of mechanical seal
Concentricity is qualified at any time for part, will not touch mill phenomenon.
Claims (7)
1. a kind of method of thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal, it is characterized in that the following steps are included:
S1, stationary seat flange are fixedly connected with asymmetric and stuffing box body end face out-of-flatness processing with water pump stuffing box body end face
Between stationary seat flange and water pump stuffing box body end face plus one piece of two sides is the oval ring interval of smooth seal plane
On plate (5), with the binding face of water pump stuffing box body end face again with unification expanded PTFE gasket, stationary seat flange and
Partition binding face is equipped with O-shaped rubber seal (1)；
If stuffing box body end face have tilt phenomenon and water pump axis verticality it is unqualified when, described two plane machinings of spacing board
For with corresponding angle；Or: if above and below stuffing box body end face or when left and right two halves are not concordant, the correspondence of the spacing board
Face is processed as male and fomale(M&F) and compensates not concordant stuffing box body end face；It should finally make mechanical sealing static ring seat flange to water pump axis
Verticality it is qualified；
S2, the short issue handling of mechanical seal service life
It is thicker using stationary seat flange so the larger feature in inner space, is changed to stationary ring for the spring driven ring side of mechanical seal
Side, and expand the spring diameter that stationary seat spring socket sleeve increases 1~2 grade.
2. the method for thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal according to claim 1, it is characterized in that: institute
The spacing board (5) stated with a thickness of 10mm, be 12mm when needing to be processed as having corresponding angle.
3. a kind of device of thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal, it is characterized in that including:
Axle sleeve (11) covers on the axis (21) of the water pump and outside the end face of stuffing box body (20) for stretching out the water pump, with
The first O-ring seal (1) radial seal is equipped between the axis (21) of water pump；
Rotating seat (2) covers on the axle sleeve (11), and its rear end is externally provided with outer lug boss, front end is stretched out outside stuffing box body end face, moves
There are gaps, and the two can be relatively rotated between ring seat and stuffing box body inner cavity；
Rotating ring (18) is sleeved on the front on the rotating seat (2), passes through the second O-ring seal (4) end face seal between the two
And it is relatively fixed by latch (3)；
Positioning ring (13), covers on the front end of the rotating seat (2), passes through sunk screw (12) from positioning ring (13) for rotating ring
Seat (2) front end is fixed on the axle sleeve (11) front end and forms a suit component；
Stationary seat flange (7), covers outside the front end of the rotating seat (2), and between the two there are cavity, the front end of inner hole is inside
Cyclic annular internal shoulder；
Stationary ring (16) is mounted in the stationary seat flange (7) and the cavity of rotating seat (2) between the two, with stationary seat
The 3rd O sealing ring (15) end face seal is equipped between flange (7)；
Spring (8) is located between the front end face of the stationary ring (16) and the internal projecting ring of stationary seat (7) inner hole front end and pushes stationary ring；
Stationary ring pin (14), be located between the front end face of the stationary ring (16) and the internal projecting ring of stationary seat (7) inner hole front end fix it is quiet
Ring；
Spacing board (5) is located at the mechanical sealing static ring seat for the smooth oval ring plate in two sides of corresponding stuffing box body end face
Between flange and the stuffing box body end face of pump；
Expanded PTFE gasket (17) is located between the binding face of the stuffing box body end face of the spacing board (5) and pump；
The mechanical sealing static ring seat flange face and spacing board binding face is equipped with the 4th O-shaped rubber seal (6)；
When the stuffing box body end face have tilt phenomenon and pump shaft verticality it is unqualified when, the spacing board (5) two
Plane has corresponding angle；Or: when two halves are not concordant above and below stuffing box body end face, the correspondence of the spacing board (5)
Face is the male and fomale(M&F) that can compensate not concordant stuffing box body end face just；It should finally make mechanical sealing static ring seat flange (7) right
The verticality of the axis of water pump is qualified.
4. the device of thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal according to claim 3, it is characterized in that: institute
On the positioning ring (13) stated by clamp force adjustment ring dowel (10) be fixed with can the dynamic clamp force adjustment ring (9) of axial displacement, can axis
The clamp force adjustment ring dynamic to displacement can connect, adjust rotating seat and quiet part seat relative position.
5. the device of thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal according to claim 3, it is characterized in that: institute
The spacing board (5) and stationary seat flange (7) stated pass through two bolt fixing seals being arranged symmetrically.
6. the device of thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal according to claim 3, it is characterized in that: institute
The cover for seat internal shoulder for the stationary seat stated is inserted with the spring of 10~16 diameter 3.6mm, and spring at front end is equipped with bullet capable of sliding back and forth
Spring guard ring.
7. the device of thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal according to claim 3, it is characterized in that: institute
Rotating ring guard ring (19) are equipped with inside outer lug boss on the rotating seat (2) stated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811510655.8A CN109751278A (en) | 2018-12-11 | 2018-12-11 | The method and device of thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811510655.8A CN109751278A (en) | 2018-12-11 | 2018-12-11 | The method and device of thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal |
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| CN109751278A true CN109751278A (en) | 2019-05-14 |
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| CN201811510655.8A Pending CN109751278A (en) | 2018-12-11 | 2018-12-11 | The method and device of thermal power plant's pure condensate wet type cooling unit low-pressure pump mechanical seal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111622979A (en) * | 2020-04-07 | 2020-09-04 | 福建福清核电有限公司 | Method for improving sealing reliability of third-stage mechanical seal of main pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111622979A (en) * | 2020-04-07 | 2020-09-04 | 福建福清核电有限公司 | Method for improving sealing reliability of third-stage mechanical seal of main pump |
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