CN209277953U - Follow-up sealing device - Google Patents
Follow-up sealing device Download PDFInfo
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- CN209277953U CN209277953U CN201822244506.3U CN201822244506U CN209277953U CN 209277953 U CN209277953 U CN 209277953U CN 201822244506 U CN201822244506 U CN 201822244506U CN 209277953 U CN209277953 U CN 209277953U
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Abstract
Follow-up sealing device, including Follow-up seal portion, Follow-up seal portion is equipped with fumarole or jet is stitched, fumarole or jet seam are communicated with fluid pressure source, Follow-up seal portion can in the gap between Follow-up seal portion and sealing surface under the action of Fluid pressure far from sealing surface, Follow-up seal portion can be affixed to sealing surface under the effect of the pressure.Sealing surface can be effectively reduced its purpose is to provide one kind to beat during the motion the leakage rate of biggish sealing system, reduced the energy waste of equipment in the process of running, improved the Follow-up sealing device of the service life of sealing device.
Description
Technical field
The utility model relates to a kind of Follow-up sealing devices.
Background technique
Non-contacting seal includes labyrinth seal, also referred to as labyrinth seal.It is mainly used for sealing gas medium, in steam turbine,
Gas turbine, centrifugal compressor, as interstage seal, shaft end seal and the sealing of leaf top or other are dynamic in the machines such as air blower
The preposition sealing of sealing, there is extensive purposes.The leakage rate of labyrinth seal is directly proportional to the throttling size of backlash, from leakproofness
It can consider, it is desirable to which the backlash that throttles is more as small as possible, because the leakage rate of labyrinth seal increases, will lead to a large amount of energy waste.
But if, for steam turbine, the longer equipment of the shafts such as gas turbine is starting and stopping by the very little of backlash design that throttles
During rotation, the revolving speed of shaft is needed during variation through more than one critical speed, attached in critical speed
Closely, the vibration of shaft can increased dramatically, and cause sealing surface to beat during the motion larger, and comb teeth and shaft thus can be made to send out
Raw friction is even collided, and throttling backlash is caused to become larger, it could even be possible to labyrinth seal loss of seal can be allowed to imitate because comb teeth fractures
Fruit.Therefore, for those, the biggish equipment of shaft bounce, people have to its labyrinth during starting and stopping rotation
The bigger of backlash design that throttle of sealing, thus causes the energy waste of equipment in the process of running larger.For large-scale vapour
Turbine, in certifiable loss in efficiency, 40% be due to labyrinth clearance it is excessive caused by.
Utility model content
The purpose of this utility model is to provide one kind can effectively reduce sealing surface beat during the motion it is biggish close
The leakage rate of envelope system reduces the energy waste of equipment in the process of running, improves the trailing type of the service life of sealing device
Sealing device.
The Follow-up sealing device of the utility model, including Follow-up seal portion, Follow-up seal portion are equipped with fumarole or spray
Air cleft, fumarole or jet seam are communicated with fluid pressure source, between Follow-up seal portion can be between Follow-up seal portion and sealing surface
Far from sealing surface under the action of Fluid pressure in gap, Follow-up seal portion can be affixed to sealing surface under the effect of the pressure.
Preferably, seal is arranged in towards on the end face of sealing surface in the Follow-up seal portion, and Follow-up seal portion passes through bullet
Property portion be connected with seal, seal be equipped with pressure duty chamber, pressure duty chamber is by seal, Follow-up seal portion and elastic portion
It encloses and is configured to, the wall of seal is equipped with the stream socket communicated with pressure duty chamber, and stream socket passes through gas circuit and stream
Body pressure source communicates, and fumarole or jet seam are communicated with pressure duty chamber.
Preferably, the elastic portion includes left side elastic portion and right side elastic portion, passes through left side on the left of Follow-up seal portion
Elastic portion is connected with seal, and the right side in Follow-up seal portion is connected by right side elastic portion with seal, and pressure duty chamber is by close
Feng Ti, Follow-up seal portion, left side elastic portion and right side elastic portion are enclosed and are configured to.
Preferably, the seal is circular ring shape, and seal inner ring is arranged with multiple pressure duty chambers, each pressure duty
The one end of chamber inwardly is respectively equipped with one and is equipped with Follow-up seal portion, and the left side in each Follow-up seal portion passes through a left side bullet respectively
Property portion be connected with seal, the right side in each Follow-up seal portion pass through respectively one right side elastic portion be connected with seal, it is multiple
Follow-up seal portion is spliced to form circular ring shape, has gap between adjacent Follow-up seal portion.
Preferably, the Follow-up seal portion is equipped with 1-3 row's fumaroles or jet is stitched, and the aperture of fumarole is 0.3mm-
0.9mm, the spacing between adjacent fumarole are 5mm -30mm.
Preferably, the intracavitary pressure sensor being equipped with for measuring pressure of the pressure duty, the aperture of fumarole is
0.5mm -0.7mm, the spacing between adjacent fumarole are 10mm -20mm.
Preferably, the Follow-up seal portion is using rubber or graphite or copper alloy or ferrite material or sealing coating material
It is made.
The Follow-up sealing device of the utility model, be especially suitable for those sealing surfaces beat during the motion it is larger
Equipment sealing, such as steam turbine, the steam packing of the longer equipment of the shafts such as gas turbine.Used the utility model with
The steam turbine of labyrinth gland made of dynamic formula sealing device, gas turbine, during starting and stopping rotation, for
Steam turbine, the longer equipment of the shafts such as gas turbine can allow pressure duty chamber to be in unexpanded before starting and stopping rotation
The home state of state allows left side elastic portion and right side elastic portion to be moved radially outwards with Follow-up seal portion, turns to allow
The rotational phase that axis increased dramatically by vibration.After the stability of rotation of shaft, then pressure duty chamber is enabled to be in swelling state, allowed
Left side elastic portion and right side elastic portion push Follow-up seal portion to move radially inward, and Follow-up seal portion is allowed to enter Follow-up seal
Position.During Follow-up seal, when the movement of sealing surface causes the gap between Follow-up seal portion and sealing surface to become larger, meeting
It enables the pressure of the fluid between Follow-up seal portion and sealing surface reduce, and then allows the fluid pair between Follow-up seal portion and sealing surface
The pressure effect that Follow-up seal portion generates can not prevent Follow-up seal portion towards when sealing surface movement, and Follow-up seal portion can be fast at this time
Speed moves under the action of pressure duty cavity fluid pressure towards sealing surface, allows the gap between Follow-up seal portion and sealing surface
Become smaller, the gap allowed between Follow-up seal portion and sealing surface is restored to original stress balance position, when the movement of sealing surface is led
When the gap between Follow-up seal portion and sealing surface being caused to become smaller, the pressure of the fluid between Follow-up seal portion and sealing surface can be enabled to increase
Push Follow-up seal portion open greatly and rapidly, the gap allowed between Follow-up seal portion and sealing surface is restored to original stress balance position
It sets, is achieved in Follow-up seal portion to the Follow-up seal of sealing surface.Therefore, the utility model can effectively reduce sealing surface and move
The leakage rate for biggish sealing system of beating in the process reduces the energy waste of equipment in the process of running, improves sealing device
Service life.Experiment shows that the utility model is remarkably improved the mechanical efficiency of large-size steam turbine.
The other details and feature of the Follow-up sealing device of the utility model can be by reading below in conjunction with attached drawing in detail
The embodiment of description can be cheer and bright.
Detailed description of the invention
Fig. 1 is a kind of main view section of the structural schematic diagram of embodiment of the Follow-up sealing device of the utility model
Figure；
Fig. 2 is the main view section of the structural schematic diagram of the another embodiment of the Follow-up sealing device of the utility model
Figure；
Fig. 3 is the main view section of the structural schematic diagram of the still another embodiment of the Follow-up sealing device of the utility model
Figure；
Fig. 4 is the main view section of the structural schematic diagram of another embodiment of the Follow-up sealing device of the utility model
Figure；
Fig. 5 is A-A sectional view of Fig. 4；
Fig. 6 is the principle for simulating the Follow-up sealing device of the utility model on computers using ANSYS FLUENT software
Figure；
Fig. 7 simulates the straight of 4 round air streams that the utility model obtains using ANSYS FLUENT software on computers
Coordinate diagram in the case of diameter D between Follow-up seal portion 3 and 1 gap delta of sealing surface and the average pressure P of round air stream；
Fig. 8 is the Follow-up seal portion in Fig. 7 and sealing surface the gap delta enlarged drawing between 0-0.1mm.
Specific embodiment
It is the trailing type sealing dress for simulating the utility model on computers using ANSYS FLUENT software referring to Fig. 6, Fig. 6
The schematic diagram set, the Follow-up seal portion 3 in figure are a tabulars, and the sealing surface 1 for needing to seal is also tabular, close being servo-actuated
The middle part in envelope portion 3 is provided with a circular fumarole 6, and there are a gap deltas between Follow-up seal portion 3 and sealing surface 1.It utilizes
ANSYS FLUENT software simulates the air for passing through that the injection pressure into gap delta of fumarole 6 is 0.5MPa on computers, passes through mould
The air that draft experiment can be seen that injection can form one along the rounded air spread apart of gap delta near fumarole 6
Stream, during diffusion, pressure can gradually decrease the circle air stream, it is assumed that the centre point of the circle air stream is jet
The diameter of the centre point in hole 6, round air stream is D, then can be obtained under different-diameter D-state, Follow-up seal portion 3 and sealing surface 1
The variation relation of gap delta size and round air stream average pressure P (MPa) size, specific value is referring to following table 1.
Table 1
By fumarole 6, the injection pressure into gap delta is 0.5MPa for simulation on computers it can be seen from table 1 above
Air when, when the numerical value of Follow-up seal portion 3 and 1 gap delta size of sealing surface is constant, the average pressure of round air stream it is big
It is small to reduce with the increase of the diameter D of round air stream, and for the diameter D of determining round air stream, round air
The size of the average pressure of stream can reduce with the increase of Follow-up seal portion 3 and 1 gap delta of sealing surface.
Simulate the Follow-up sealing device of the utility model on computers using ANSYS FLUENT software, on computers mould
It is quasi- that by fumarole 6, into gap delta, injection pressure is the air of 0.5MPa, the diameter D situation of obtained 4 round air streams
Coordinate diagram between lower Follow-up seal portion 3 and 1 gap delta of sealing surface and the average pressure P of round air stream, then such as Fig. 7 and Fig. 8 institute
Show, wherein Fig. 8 is the Follow-up seal portion 3 in Fig. 7 and 1 gap delta of the sealing surface enlarged drawing between 0-0.1mm.It can by Fig. 7 and Fig. 8
To find out, on computers simulation by fumarole 6 into gap delta injection pressure be 0.5MPa air when, when Follow-up seal portion 3
When constant with the numerical value of 1 gap delta size of sealing surface, the size of the average pressure of round air stream can be straight with round air stream
The increase of diameter D and reduce, and for the diameter D of determining round air stream, the size of the average pressure of round air stream can be with
The increase of Follow-up seal portion 3 and 1 gap delta of sealing surface and reduce.
As shown in Figure 1, the Follow-up sealing device of the utility model, including Follow-up seal portion 3, set in Follow-up seal portion 3
There are fumarole 6 or jet seam, fumarole 6 or jet seam are communicated with fluid pressure source, and Follow-up seal portion 3 can be in Follow-up seal portion 3
Far from sealing surface 1 under the action of Fluid pressure in gap between sealing surface 1, Follow-up seal portion 3 can be under the effect of the pressure
It is affixed to sealing surface 1.
As shown in Fig. 2, the Follow-up sealing device of the utility model, can be including seal 2, seal 2 is annulus
Shape, seal 2 are equipped with Follow-up seal portion 3, and the left side in Follow-up seal portion 3 is connected by left side elastic portion 4 with seal 2, with
The right side in dynamic sealing portion 3 is connected by right side elastic portion 5 with seal 2, and Follow-up seal portion 3 is equipped with 3 rows, the multiple jets of every row
Hole 6 or jet seam, the aperture of fumarole 6 are 0.3mm -0.9mm, and the spacing between adjacent fumarole 6 is 5mm -30mm；
Multiple fumaroles 6 or jet seam are communicated with the pressure duty chamber 7 being equipped in seal 2, that is, fumarole 6 or jet seam are to use
It is connected to 7 inner cavity of pressure duty chamber and extraneous channel, pressure duty chamber 7 is by seal 2, Follow-up seal portion 3, left side elastic portion
4 and right side elastic portion 5 enclose and be configured to the wall of seal 2 and be equipped with the stream socket 8 that communicates with pressure duty chamber 7；
Above-mentioned left side elastic portion 4 and right side elastic portion 5, which can be, bends arc-shaped wheat flour into Follow-up seal with steel spring plate
Portion 3 can be with flexible rubber system at when in pressure duty chamber 7 without left fluid, Follow-up seal portion 3 can be on a left side
Make the returning movement far from sealing surface 1, left side elastic portion 4 and the right side under the action of the elastic force of side elastic portion 4 and right side elastic portion 5
Side elastic portion 5 is in respectively the biggish state of bending degree, and by the circumference ruler in flexible Follow-up seal portion 3 made of rubber
Very little stretching is opened, and enables the circumferential size in its circular sealing surface direction become larger, diameter dimension also becomes larger；When in pressure duty chamber 7
After injection fluid, since Follow-up sealing device is arranged in the seal groove 11 on base 10, due on organic block 10
The limitation of seal groove 11, Follow-up seal portion 3 can move towards sealing surface 1 under the action of pressure duty 7 fluid pressure of chamber, allow
The bending degree of left side elastic portion 4 and right side elastic portion 5 becomes smaller, and the circumferential size in flexible Follow-up seal portion 3 also becomes smaller,
Withdraw the size elongated in advance during installation in Follow-up seal portion 3, since 3 diameter of Follow-up seal portion becomes smaller, Follow-up seal portion
3 can be affixed to sealing surface 1 towards the surface of sealing surface 1, carry out Follow-up seal to the periphery of shaft 9.
During Follow-up seal, when the movement of sealing surface 1 causes the gap between Follow-up seal portion 3 and sealing surface 1 to become
When big, the pressure of the fluid between Follow-up seal portion 3 and sealing surface 1 can be enabled to reduce, Follow-up seal portion 3 can be rapidly in pressure at this time
It is moved under the action of 7 fluid pressure of working chamber towards sealing surface 1, the gap between Follow-up seal portion 3 and sealing surface 1 is allowed to become
Small, the gap allowed between Follow-up seal portion 3 and sealing surface 1 is restored to original stress balance position, when the movement of sealing surface 1 is led
When the gap between Follow-up seal portion 3 and sealing surface 1 being caused to become smaller, the pressure of the fluid between Follow-up seal portion 3 and sealing surface 1 can be enabled
Power increases and pushes Follow-up seal portion 3 open rapidly, and the gap allowed between Follow-up seal portion 3 and sealing surface 1 is restored to original stress
Equilbrium position is achieved in Follow-up seal portion 3 to the Follow-up seal of sealing surface 1.
The pressure being equipped in above-mentioned pressure duty chamber 7 for measuring pressure as a further improvement of the utility model, passes
Sensor, the aperture of fumarole 6 are 0.5mm -0.7mm, and the spacing between adjacent fumarole 6 is 10mm -20mm.
As shown in figure 3, the Follow-up sealing device of the utility model, is also possible to include seal 2, seal 2 is circle
Annular, seal 2 are equipped with Follow-up seal portion 3, and the left side in Follow-up seal portion 3 is connected by left side elastic portion 4 with seal 2,
The right side in Follow-up seal portion 3 is connected by right side elastic portion 5 with seal 2, and Follow-up seal portion 3 is equipped with the multiple fumaroles 6 of 1 row
Or jet seam, the aperture of fumarole 6 are 0.3mm -0.9mm, the spacing between adjacent fumarole 6 is 5mm -30mm；It is multiple
Fumarole 6 or jet seam are communicated with the pressure duty chamber 7 being equipped in seal 2, that is, fumarole 6 or jet seam are for even
Logical 7 inner cavity of pressure duty chamber and extraneous channel, pressure duty chamber 7 is by seal 2, Follow-up seal portion 3,4 and of left side elastic portion
Right side elastic portion 5 encloses the wall for being configured to seal 2 equipped with the stream socket 8 communicated with pressure duty chamber 7；
Above-mentioned Follow-up seal portion 3, left side elastic portion 4 and right side elastic portion 5 be all with flexible rubber system at, and
Follow-up seal portion 3 and left side elastic portion 4 are connected with each other and are integrated, and it is one that Follow-up seal portion 3 and right side elastic portion 5, which are connected with each other,
Body, when in pressure duty chamber 7 without left fluid, Follow-up seal portion 3 can be in the elasticity of left side elastic portion 4 and right side elastic portion 5
Make the returning movement far from sealing surface 1 under the action of power, i.e., left side elastic portion 4 and right side elastic portion 5 respectively will be made of rubber
The circumferential size stretching in flexible Follow-up seal portion 3 is opened, and enables the circumferential size in its circular sealing surface direction become larger, directly
Diameter size also becomes larger；After in pressure duty chamber 7 by injection fluid, since Follow-up sealing device is arranged on base 10
In seal groove, due to the limitation of the seal groove 11 on organic block 10, Follow-up seal portion 3 is in 7 fluid pressure of pressure duty chamber
It can be moved towards sealing surface 1 under effect, allow left side elastic portion 4 and right side elastic portion 5 to shrink inwards, flexible Follow-up seal
The circumferential size in portion 3 also becomes smaller, that is, the size elongated in advance during installation in Follow-up seal portion 3 is withdrawn, due to Follow-up seal portion 3
Diameter becomes smaller, and Follow-up seal portion 3 can be affixed to sealing surface 1 towards the surface of sealing surface 1, be servo-actuated to the periphery of shaft 9 close
Envelope.
During Follow-up seal, when the movement of sealing surface 1 causes the gap between Follow-up seal portion 3 and sealing surface 1 to become
When big, the pressure of the fluid between Follow-up seal portion 3 and sealing surface 1 can be enabled to reduce, and then allow Follow-up seal portion 3 and sealing surface 1
Between fluid pressure effect that Follow-up seal portion 3 is generated when Follow-up seal portion 3 can not be prevented to move towards sealing surface 1, this
When Follow-up seal portion 3 can be moved under the action of pressure duty 7 fluid pressure of chamber towards sealing surface 1 rapidly, allow Follow-up seal
Gap between portion 3 and sealing surface 1 becomes smaller, and the gap allowed between Follow-up seal portion 3 and sealing surface 1 is restored to original stress
Equilbrium position can enable Follow-up seal when the movement of sealing surface 1 causes the gap between Follow-up seal portion 3 and sealing surface 1 to become smaller
The pressure of fluid between portion 3 and sealing surface 1, which increases, simultaneously pushes rapidly Follow-up seal portion 3 open, allows Follow-up seal portion 3 and sealing surface 1
Between gap be restored to original stress balance position, be achieved in Follow-up seal portion 3 to the Follow-up seal of sealing surface 1.
The pressure being equipped in above-mentioned pressure duty chamber 7 for measuring pressure as a further improvement of the utility model, passes
Sensor, the aperture of fumarole 6 are 0.5mm -0.7mm, and the spacing between adjacent fumarole 6 is 10mm -20mm.
As shown in Figure 4 and Figure 5, the Follow-up sealing device of the utility model is also possible to include seal 2, seal 2
For circular ring shape, 2 inner ring of seal is arranged with multiple pressure duty chambers 7, and the one end of each pressure duty chamber 7 inwardly is respectively equipped with one
A to be equipped with Follow-up seal portion 3, the left side in each Follow-up seal portion 3 passes through a left side elastic portion 4 respectively and is connected with seal 2,
The right side in each Follow-up seal portion 3 passes through a right side elastic portion 5 respectively and is connected with seal 2, and multiple Follow-up seal portions 3 are spelled
Composition circular ring shape is connect, there is gap between adjacent Follow-up seal portion 3.The multiple sprays of 1 row are respectively equipped in each Follow-up seal portion 3
Stomata 6 or jet seam, the aperture of fumarole 6 are 0.3mm -0.9mm, and the spacing between adjacent fumarole 6 is 5mm -
30mm；Multiple fumaroles 6 or jet seam is communicated respectively with pressure duty chamber 7 corresponding on seal 2, that is, fumarole 6 or
Jet seam is for being connected to 7 inner cavity of pressure duty chamber and extraneous channel, and each pressure duty chamber 7 is respectively by corresponding seal
2, Follow-up seal portion 3, left side elastic portion 4 and right side elastic portion 5 are enclosed and are configured to, and the wall of seal 2 is equipped with and all pressure
The stream socket 8 that working chamber 7 communicates；
Above-mentioned left side elastic portion 4 and right side elastic portion 5 be with flexible rubber system at or spring steel be bent into, with
Dynamic sealing portion 3 be with graphite or copper alloy or ferrite material or sealing coating material, when in pressure duty chamber 7 without left fluid
When, Follow-up seal portion 3 can make the return far from sealing surface 1 under the action of the elastic force of left side elastic portion 4 and right side elastic portion 5
Movement, i.e. left side elastic portion 4 and right side elastic portion 5 enable circumferential size of multiple Follow-up seal portions 3 around 1 direction of sealing surface become
Greatly, the gap size having between adjacent Follow-up seal portion 3 also becomes larger；After being injected left fluid in pressure duty chamber 7, by
It is arranged in the seal groove on base 10 in Follow-up sealing device, due to the limitation of the seal groove 11 on organic block 10, with
Dynamic sealing portion 3 can move under the action of pressure duty 7 fluid pressure of chamber towards sealing surface 1, allow left side elastic portion 4 and right side
Elastic portion 5 is shunk inwards, enables circumferential size of multiple Follow-up seal portions 3 around 1 direction of sealing surface become smaller, adjacent Follow-up seal
The gap size having between portion 3 becomes smaller, and since the gap size having between adjacent Follow-up seal portion 3 becomes smaller, is servo-actuated close
Envelope portion 3 can be affixed to sealing surface 1 towards the surface of sealing surface 1, carry out Follow-up seal to the periphery of shaft 9.
During Follow-up seal, when the movement of sealing surface 1 causes the gap between Follow-up seal portion 3 and sealing surface 1 to become
When big, the pressure of the fluid between Follow-up seal portion 3 and sealing surface 1 can be enabled to reduce, and then allow Follow-up seal portion 3 and sealing surface 1
Between fluid pressure effect that Follow-up seal portion 3 is generated when Follow-up seal portion 3 can not be prevented to move towards sealing surface 1, this
When Follow-up seal portion 3 can be moved under the action of pressure duty 7 fluid pressure of chamber towards sealing surface 1 rapidly, allow Follow-up seal
Gap between portion 3 and sealing surface 1 becomes smaller, and the gap allowed between Follow-up seal portion 3 and sealing surface 1 is restored to original stress
Equilbrium position can enable Follow-up seal when the movement of sealing surface 1 causes the gap between Follow-up seal portion 3 and sealing surface 1 to become smaller
The pressure of fluid between portion 3 and sealing surface 1, which increases, simultaneously pushes rapidly Follow-up seal portion 3 open, allows Follow-up seal portion 3 and sealing surface 1
Between gap be restored to original stress balance position, be achieved in Follow-up seal portion 3 to the Follow-up seal of sealing surface 1.
The pressure being equipped in above-mentioned pressure duty chamber 7 for measuring pressure as a further improvement of the utility model, passes
Sensor, the aperture of fumarole 6 are 0.5mm -0.7mm, and the spacing between adjacent fumarole 6 is 10mm -20mm.
The Follow-up sealing device of the utility model when in use, the fluid pressure in pressure duty chamber 7 of Follow-up seal portion 3
Radially make contractile motion inwards under the action of power, the gap between sealing surface 1 that Follow-up seal portion 3 and needs seal can not
It is disconnected to reduce, and the pressure in the fluid field of force between the sealing surface 1 for enabling Follow-up seal portion 3 and needs seal constantly increases, when servo-actuated
The pressure in the fluid field of force between sealing surface 1 that sealing 3 and needs seal can support the pressure effect that Follow-up seal portion 3 generates
The Follow-up seal portion 3 that disappears radially makees the pressure effect of contractile motion inwards under the action of pressure duty 7 fluid pressure of chamber
When, Follow-up seal portion 3 can stop contractile motion, and the gap between sealing surface 1 for allowing Follow-up seal portion 3 and needs to seal is kept not
Become；
Gap between the sealing surface 1 for needing the movement of the sealing surface 1 sealed that Follow-up seal portion 3 and needs is caused to seal
When becoming larger, the pressure in the fluid field of force between sealing surface 1 that Follow-up seal portion 3 and needs can be enabled to seal reduces, and then allows servo-actuated
The pressure effect that the pressure in the fluid field of force between sealing surface 1 that sealing 3 and needs seal generates Follow-up seal portion 3 can not
Offset the pressure work that Follow-up seal portion 3 radially makees contractile motion inwards under the action of pressure duty 7 fluid pressure of chamber
With Follow-up seal portion 3 can radially make contraction fortune inwards under the action of pressure duty 7 fluid pressure of chamber again at this time
Dynamic, the gap between sealing surface 1 for allowing Follow-up seal portion 3 and needs to seal is restored to original stress balance position, thus real
The Follow-up seal of the existing 3 pairs of sealing surfaces 1 for needing to seal in Follow-up seal portion；
Gap between the sealing surface 1 for needing the movement of the sealing surface 1 sealed that Follow-up seal portion 3 and needs is caused to seal
When becoming smaller, the pressure in the fluid field of force between sealing surface 1 that Follow-up seal portion 3 and needs can be enabled to seal increases, and then allows servo-actuated
The pressure in the fluid field of force between sealing surface 1 that sealing 3 and needs seal is greater than the pressure effect that Follow-up seal portion 3 generates
Follow-up seal portion 3 radially makees the pressure effect of contractile motion inwards under the action of pressure duty 7 fluid pressure of chamber, this
When Follow-up seal portion 3 can edge in Follow-up seal portion 3 and under the action of needing the pressure in the fluid field of force between the sealing surface 1 that seals
Radial direction makees outside extensional motion, the gap allowed between Follow-up seal portion 3 and the sealing surface 1 that seals of needs be restored to it is original by
Dynamic balance position is achieved in the Follow-up seal of the 3 pairs of sealing surfaces 1 for needing to seal in Follow-up seal portion.
The Follow-up sealing device of the utility model when in use, when pressure duty chamber 7 increases volume due to expansion,
Left side elastic portion 4 and right side elastic portion 5 just will push the inner end in Follow-up seal portion 3 close to steam turbine or gas turbine or centrifugal
The side of the shaft 9 of the machines such as compressor or air blower, Follow-up seal portion 3 adjacent at this time is closely affixed each other, multiple servo-actuated
Optimal seal clearance is formed between the inner end and shaft 9 of sealing 3, when pressure duty chamber 7 is set back due to pressure release
When volume, left side elastic portion 4 and right side elastic portion 5 just will pull the inner end in Follow-up seal portion 3 far from steam turbine or gas turbine
Or the shaft 9 of the machines such as centrifugal compressor or air blower, allow shaft 9 can in the state of axial larger bounce rotation without
Contact the inner end in Follow-up seal portion 3.
Left side elastic portion 4 and right side elastic portion 5 are designed to the structure of arc panel made of spring steel by the utility model, are
In order to allow pressure duty chamber 7 to have biggish expansion space and rebound space, and then left side elastic portion 4 and right side elastic portion can also be allowed
5 can have biggish radial displacement when pushing or pulling on Follow-up seal portion 3.
But the plate face of left side elastic portion 4 and right side elastic portion 5 made of spring steel is not necessarily meant to be designed to arc panel, i.e.,
The plate face of elastic portion 4 and right side elastic portion 5 is flat on the left of making, and the expansion of pressure duty chamber 7 also can enable Follow-up seal portion 3 inwards
It being expanded, and then Follow-up seal portion 3 is allowed to make radial displacement, the distance of radial displacement should not be very big, as long as usually 1-2 millimeters
?.
Embodiment 1
Referring to Fig. 1, the implementation method of the Follow-up sealing device of the utility model, comprising the following steps:
A, the Follow-up seal portion 3 of a circular ring shape, Follow-up seal portion 3 are set near the sealing surface 1 for the axis 9 for needing to seal
It is made of flexible rubber, Follow-up seal portion 3, which can be, to be placed in seal groove, and Follow-up seal portion 3 is equipped with spray
Stomata 6 or jet seam, fumarole 6 or jet seam are communicated with fluid pressure source；
B, it allows Follow-up seal portion 3 by being affixed to sealing surface 1 under the action of the elastic shrinkage bring pressure of rubber, allows to flow automatically
Fumarole 6 or the jet seam that the fluid of body pressure source is equipped with via Follow-up seal portion 3 eject, and flow to Follow-up seal portion
In gap between 3 and sealing surface 1；
C, as Follow-up seal portion 3 is affixed to sealing surface 1, the gap that will lead between Follow-up seal portion 3 and sealing surface 1 is continuous
It reduces, the pressure of the fluid between Follow-up seal portion 3 and sealing surface 1 can be enabled constantly to increase, final Follow-up seal portion 3 and sealing surface
Gap between 1 will no longer reduce, and enter force balance state between Follow-up seal portion 3 and sealing surface 1；
D, when the movement of sealing surface 1 leads to sealing surface 1 far from Follow-up seal portion 3, Follow-up seal portion 3 and sealing surface 1 it
Between the pressure of fluid can reduce, and then Follow-up seal portion 3 is allowed to move under the effect of the pressure towards sealing surface 1 rapidly, until
Gap between Follow-up seal portion 3 and sealing surface 1 is restored to original stress balance position；
When the movement of sealing surface 1 leads to sealing surface 1 further to Follow-up seal portion 3, Follow-up seal portion 3 and sealing surface
The pressure of fluid between 1 will increase, and then Follow-up seal portion 3 is allowed to transport under the effect of the pressure away from sealing surface 1 rapidly
It is dynamic, until the gap between Follow-up seal portion 3 and sealing surface 1 is restored to original stress balance position, be achieved in be servo-actuated it is close
Follow-up seal of the envelope portion 3 to sealing surface 1.
Embodiment 2
Referring to fig. 2, Fig. 3, Fig. 4 and Fig. 5, the implementation method of the Follow-up sealing device of the utility model comprising following
Step:
A, seal 2 is set near the sealing surface 1 for needing to seal, and seal 2 is equipped with servo-actuated towards the end face of sealing surface 1
Sealing 3, Follow-up seal portion 3 are connected by elastic portion with seal 2, and Follow-up seal portion 3 is equipped with fumarole 6 or jet is stitched,
Fumarole 6 or jet seam are communicated with the pressure duty chamber 7 being equipped in seal 2, and pressure duty chamber 7 is by seal 2, Follow-up seal
Portion 3 and elastic portion, which are enclosed, to be configured to, and the wall of seal 2 is equipped with the stream socket 8 communicated with pressure duty chamber 7；
B, there is the fluid of pressure by stream socket 8 to the injection of pressure duty chamber 7, to push 3 grams of Follow-up seal portion
It takes the resilient force of elastic portion and is moved towards sealing surface 1, while the fluid in pressure duty chamber 7 can be via Follow-up seal portion
3 fumaroles 6 being equipped with or jet seam eject, and flow in the gap between Follow-up seal portion 3 and sealing surface 1, spray
The fluid gone out can generate pressure effect to Follow-up seal portion 3 and sealing surface 1；
C, with Follow-up seal portion 3 under the action of pressure duty 7 fluid pressure of chamber towards sealing surface 1 movement cause with
Gap between dynamic sealing portion 3 and sealing surface 1 can constantly reduce, and can enable the pressure of the fluid between Follow-up seal portion 3 and sealing surface 1
Power constantly increases, when the pressure rise of fluid to can prevent Follow-up seal portion 3 towards sealing surface 1 move when, Follow-up seal portion 3
Gap between sealing surface 1 will no longer reduce, and enter force balance state between Follow-up seal portion 3 and sealing surface 1, it may be assumed that
F1-F2-F3=0
F1 in above formula is pressure of the fluid matasomatism in Follow-up seal portion 3 in pressure duty chamber 7, direction be will be servo-actuated it is close
Envelope portion 3 presses to sealing surface 1；
F2 is that elastic portion acts on the elastic force in Follow-up seal portion 3, and direction is hauled Follow-up seal portion 3 far from sealing
Face 1；
Pressure of fluid matasomatism of the F3 between Follow-up seal portion 3 and sealing surface 1 in Follow-up seal portion 3, direction be by
Follow-up seal portion 3 is hauled far from sealing surface 1；
D, when the movement of sealing surface 1 leads to sealing surface 1 far from Follow-up seal portion 3, Follow-up seal portion 3 and sealing surface 1 it
Between the pressure F3 of fluid can reduce, and then allow Follow-up seal portion 3 under the action of 7 fluid pressure F1 of pressure duty chamber rapidly
It is moved towards sealing surface 1, until the gap between Follow-up seal portion 3 and sealing surface 1 is restored to original stress balance position；
When the movement of sealing surface 1 leads to sealing surface 1 further to Follow-up seal portion 3, Follow-up seal portion 3 and sealing surface
The pressure F3 of fluid between 1 will increase, and then make Follow-up seal portion 3 fast under the action of pressure duty 7 fluid pressure of chamber
Speed is moved away from sealing surface 1, until the gap between Follow-up seal portion 3 and sealing surface 1 is restored to original stress balance
Position is achieved in Follow-up seal portion 3 to the Follow-up seal of sealing surface 1.
In the prior art, when steam turbine crosses critical speed in starting, stopping process, rotor amplitude is larger, if packing
Radially installed gap is smaller, and gland sealing gear is easy to wear；After gland sealing gear is worn, since shaft-packing leakage amount is larger, steam pair
The heated zones of axis increased, and temperature is also increased, and swollen difference is made to become larger, the high and low tooth hair of axis convex platform and gland blocks
It gives birth to relative displacement and lodges, cause steam loss to increase, sealing effect cannot be guaranteed；It is sealed using the trailing type of the utility model
The appearance of above-mentioned problem in the prior art can be then reduced or avoided in device.
When gland sealing gear and axis touch mill, moment generates amount of heat, causes axis hot-spot, in some instances it may even be possible to lead to big axis
Bending.So power plant can only tune up packing radial clearance in unit maintenance, ensure unit to sacrifice economy as cost
Safety；Using the Follow-up sealing device of the utility model, then going out for above-mentioned problem in the prior art can be reduced or avoided
It is existing.
The inhomogeneities of labyrinth seal annular compartment is to generate the major reason of flow-induced vibration, and steam turbine left rotor produces
Raw flow-induced vibration jeopardizes the safe operation of unit once being difficult to solve；Spring is bad, or is broken, and makes
Increase at air leakage；The abrasion of packing is permanent；Using the Follow-up sealing device of the utility model, then it can reduce or keep away
Exempt from the appearance of above-mentioned problem in the prior art.
The superiority and inferiority of packing performance not only influences the economy of unit, but also influences the reliability of unit；It is steamed between stage
Vapour is revealed so that unit internal efficiency reduces；Packing reveals the interference to liquid main flow, causes the variation of field；Use this reality
With novel Follow-up sealing device, then the appearance of above-mentioned problem in the prior art can be reduced or avoided.
Other than wasting the steam of a large amount of high-quality, leakage steam enters bearing housing can also make in oil the steam leakage of axle envelope
Band water, oil emulsification, lubricating oil film quality are deteriorated, destroy dynamically lubricating effect, cause oil whip, cause unit vibration even
Bearing liner burnout is shut down；Water inlet may also result in regulating member corrosion bite in oil, jeopardize unit safety；Using the utility model with
The appearance of above-mentioned problem in the prior art can be then reduced or avoided in dynamic formula sealing device.
The Follow-up sealing device of the utility model is especially suitable for steam turbine, and the shafts such as gas turbine are longer to be set
Standby steam packing.The steam turbine of labyrinth gland made of the Follow-up sealing device of the utility model, combustion gas wheel are used
Machine, during starting and stopping rotation, for steam turbine, the longer equipment of the shafts such as gas turbine 9 is being started and stopped
Before rotation, pressure duty chamber 7 can be allowed to be in the home state of unswollen state, allow left side elastic portion 4 and 5 band of right side elastic portion
Follow-up seal portion 3 be moved radially outwards, so that shaft 9 be allowed to pass through the rotational phase that increased dramatically of vibration.When turning for shaft 9
After moving steadily, then pressure duty chamber 7 is enabled to be in swelling state, left side elastic portion 4 and right side elastic portion 5 is allowed to push Follow-up seal portion
3 move radially inward, and Follow-up seal portion 3 is allowed to enter Follow-up seal position.During Follow-up seal, when sealing surface 1
When movement causes the gap between Follow-up seal portion 3 and sealing surface 1 to become larger, the stream between Follow-up seal portion 3 and sealing surface 1 can be enabled
The pressure of body reduces, and then the fluid allowed between Follow-up seal portion 3 and sealing surface 1 acts on the pressure that Follow-up seal portion 3 generates
When Follow-up seal portion 3 can not be prevented to move towards sealing surface 1, Follow-up seal portion 3 can flow in pressure duty chamber 7 rapidly at this time
It is moved under the action of body pressure towards sealing surface 1, the gap between Follow-up seal portion 3 and sealing surface 1 is allowed to become smaller, allow Follow-up seal
Gap between portion 3 and sealing surface 1 is restored to original stress balance position, when the movement of sealing surface 1 leads to Follow-up seal portion 3
When gap between sealing surface 1 becomes smaller, can enable the fluid between Follow-up seal portion 3 and sealing surface 1 pressure increase and it is rapid
Push Follow-up seal portion 3 open, the gap allowed between Follow-up seal portion 3 and sealing surface 1 is restored to original stress balance position, thus
Realize Follow-up seal portion 3 to the Follow-up seal of sealing surface 1.Therefore, the utility model can effectively reduce sealing surface in motion process
The leakage rate of the middle biggish sealing system of bounce, reduces the energy waste of equipment in the process of running, improves making for sealing device
Use the service life.
Claims (7)
1. Follow-up sealing device, it is characterised in that including Follow-up seal portion (3), Follow-up seal portion (3) are equipped with fumarole (6)
Or jet seam, fumarole (6) or jet seam are communicated with fluid pressure source, Follow-up seal portion (3) can be Follow-up seal portion (3) and close
Far from sealing surface (1) under the action of Fluid pressure in gap between cover (1), Follow-up seal portion (3) can be in the effect of pressure
Under be affixed to sealing surface (1).
2. Follow-up sealing device according to claim 1, it is characterised in that Follow-up seal portion (3) setting is sealing
Body (2) is towards on the end face of sealing surface (1), and Follow-up seal portion (3) are connected by elastic portion with seal (2), on seal (2)
Equipped with pressure duty chamber (7), pressure duty chamber (7) is enclosed and is configured to by seal (2), Follow-up seal portion (3) and elastic portion, sealing
The wall of body (2) is equipped with the stream socket (8) communicated with pressure duty chamber (7), and stream socket (8) passes through gas circuit and fluid
Pressure source communicates, and fumarole (6) or jet seam are communicated with pressure duty chamber (7).
3. Follow-up sealing device according to claim 2, it is characterised in that the elastic portion includes left side elastic portion (4)
It is connected by left side elastic portion (4) with seal (2) with the left side of right side elastic portion (5), Follow-up seal portion (3), Follow-up seal
The right side in portion (3) is connected by right side elastic portion (5) with seal (2), and pressure duty chamber (7) is by seal (2), Follow-up seal
Portion (3), left side elastic portion (4) and right side elastic portion (5) are enclosed and are configured to.
4. Follow-up sealing device according to claim 3, it is characterised in that the seal (2) is circular ring shape, sealing
Body (2) inner ring is arranged with multiple pressure duty chambers (7), and the one end of each pressure duty chamber (7) inwardly is respectively equipped with one and is equipped with
Follow-up seal portion (3), the left side of each Follow-up seal portion (3) pass through a left side elastic portion (4) and seal (2) phase respectively
Even, the right side of each Follow-up seal portion (3) pass through respectively one right side elastic portion (5) be connected with seal (2), it is multiple be servo-actuated it is close
Envelope portion (3) is spliced to form circular ring shape, has gap between adjacent Follow-up seal portion (3).
5. Follow-up sealing device according to claim 4, it is characterised in that the Follow-up seal portion (3) is equipped with 1-3
Fumarole (6) or jet seam are arranged, the aperture of fumarole (6) is 0.3mm -0.9mm, and the spacing between adjacent fumarole (6) is
5mm—30mm。
6. Follow-up sealing device according to claim 5, it is characterised in that be equipped with and be used in the pressure duty chamber (7)
The pressure sensor of pressure is measured, the aperture of fumarole (6) is 0.5mm -0.7mm, the spacing between adjacent fumarole (6)
For 10mm -20mm.
7. Follow-up sealing device according to claim 6, it is characterised in that the Follow-up seal portion (3) using rubber or
Graphite or copper alloy or ferrite material or sealing coating material are made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822244506.3U CN209277953U (en) | 2018-12-28 | 2018-12-28 | Follow-up sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822244506.3U CN209277953U (en) | 2018-12-28 | 2018-12-28 | Follow-up sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209277953U true CN209277953U (en) | 2019-08-20 |
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ID=67607998
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822244506.3U Active CN209277953U (en) | 2018-12-28 | 2018-12-28 | Follow-up sealing device |
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| Country | Link |
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| CN (1) | CN209277953U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109695482A (en) * | 2018-12-28 | 2019-04-30 | 孟金来 | Trailing type encapsulating method and device |
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2018
- 2018-12-28 CN CN201822244506.3U patent/CN209277953U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109695482A (en) * | 2018-12-28 | 2019-04-30 | 孟金来 | Trailing type encapsulating method and device |
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