CN205663458U - Check valve assembly and turbine unit - Google Patents
Check valve assembly and turbine unit Download PDFInfo
- Publication number
- CN205663458U CN205663458U CN201620429394.7U CN201620429394U CN205663458U CN 205663458 U CN205663458 U CN 205663458U CN 201620429394 U CN201620429394 U CN 201620429394U CN 205663458 U CN205663458 U CN 205663458U
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- valve
- return valve
- valve assembly
- valve plate
- power
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- 230000009471 action Effects 0.000 claims abstract description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 8
- 238000009423 ventilation Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 206010016766 flatulence Diseases 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000004899 motility Effects 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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- Check Valves (AREA)
Abstract
The utility model discloses a check valve assembly and turbine unit, the check valve assembly includes check valve (1) and can be right the valve plate of check valve (1) apply open the helping hand so that the valve plate open, apply close the helping hand so that the valve plate is closed or is made the valve plate is in free state's actuating mechanism, the check valve assembly still includes and is used for controlling the control unit (3) of actuating mechanism action. The utility model provides a check valve assembly and turbine unit, check valve stability in the application process is good, and the reliability is high.
Description
Technical field
This utility model relates to valve gate technology, in particular it relates to a kind of non-return valve assembly and Steam Turbine.
Background technology
Non-return valve is used to prevent the valve of medium water conservancy diversion, as being provided with non-return valve in Turbo-generator Set, be in order to
When Steam Turbine is in unexpected removal of load, the pressure in steam turbine prevents cold section of cold steam of reheater or water from falling when reducing suddenly
Stream enters in steam turbine.
Existing high pressure exhaust check valve mainly has two kinds of type of drive:
The first is heavy bell type air assisted closing type high exhaust check valve, and this non-return valve only has power-assisted to close mode, helpless
Power unfolding mode, there is the valve plate when positive draft is less and can rock percussion valve seat back and forth and cause it to damage in this non-return valve
Problem.
The second is by actuator, valve to be applied power-assisted to turn on non-return valve that is dynamic or that make it close.This check
Opening or closing of valve is all carried out by power-assisted, and without " free state ", does not the most exist by positive draft or inverted draft
Make the state that valve opens or closes voluntarily.Such valve, owing to being all to be opened or closed by power-assisted, is therefore existed
Logic comprehensively time, valve can be there is can not close in time or be not closed completely close problem when producing reverse steam flow.
Accordingly, it is desirable to provide the valve that a kind of good stability, reliability are high.
Utility model content
The purpose of this utility model is to provide a kind of non-return valve assembly and Steam Turbine, of the prior art inverse in order to solve
Only existing for valve when low discharge, the valve plate instability of non-return valve is rocked back and forth, or the control logic of valve not comprehensively, produce
During inverted draft, valve can not be closed or be not closed completely close problem in time.
To achieve these goals, this utility model provides a kind of non-return valve assembly, and described non-return valve assembly includes check
Valve and the valve plate of described non-return valve can be applied to open power-assisted so that described valve plate is opened, applied to close power-assisted so that described valve
Plate is closed or makes described valve plate be in the actuator of free state, described non-return valve assembly also include controlling described in hold
The control unit of row mechanism action.
Preferably, described actuator includes that cylinder, the piston in described cylinder are connected with described valve plate, and described control is single
Unit controls the motion of described piston and opens to control described valve plate, close or be in free state.
Preferably, described actuator also includes source of the gas, and the both sides of described cylinder are respectively by pipeline with described source of the gas even
Connect, the first pipeline between the side of described source of the gas and described cylinder is provided with control described first pipeline break-make with control
Make described piston and whether described valve plate apply to open the first electromagnetic valve of power-assisted, the opposite side of described source of the gas and described cylinder it
Between the second pipeline on be provided with to control described second pipeline break-make to control whether described piston applies described valve plate
Close the second electromagnetic valve of power-assisted；
Described first electromagnetic valve and described second electromagnetic valve are connected with described control unit, are controlled by described control unit
Described first electromagnetic valve and the power on/off of described second electromagnetic valve.
Preferably, described first electromagnetic valve and described second electromagnetic valve are two-bit triplet normal-closed electromagnetic valve.
Preferably, described first electromagnetic valve is be arranged in parallel two or more.
Preferably, described source of the gas connect have main pipe rail, described first pipeline and described second pipeline be connected to described always
Pipeline, described main pipe rail is provided with pressure switch.
Preferably, described main pipe rail is additionally provided with filter, air relief valve and oil sprayer.
Preferably, the described valve plate of described non-return valve has the rotating shaft rotated, and in described rotating shaft, connection has and has weight
The crank of hammer, described piston is connected with described crank.
This utility model also provides for a kind of Steam Turbine, and described Steam Turbine includes high pressure cylinder, the aerofluxus of described high pressure cylinder
Mouth is provided with non-return valve assembly as above.
In the non-return valve assembly of this utility model offer and Steam Turbine, the valve plate of non-return valve can be applied open by actuator
Open power-assisted so that valve plate is in open mode, or apply valve plate to close power-assisted so that described valve plate is in closedown shape
State, or make described valve plate be in free state.Non-return valve is selected according to the different operating modes of equipment by actuator
Use state, can make non-return valve more stable in application process, and reliability is high.
Other features and advantages of the utility model will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to offer and is further appreciated by of the present utility model, and constitutes a part for description, with following
Detailed description of the invention be used for explaining this utility model together, but be not intended that restriction of the present utility model.In the accompanying drawings:
The structural representation of the non-return valve assembly that Fig. 1 provides for this utility model.
Description of reference numerals:
1-non-return valve；2-cylinder；
21-piston；3-control unit；
4-the first electromagnetic valve；5-the second electromagnetic valve；
6-the first pipeline；61-branch road；
7-the second pipeline；8-main pipe rail；
9-pressure switch；10-filter；
11-air relief valve；12-oil sprayer；
13-crank；14-rotating shaft；
15-weight.
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in detail.It should be appreciated that herein
Described detailed description of the invention is merely to illustrate and explains this utility model, is not limited to this utility model.
This utility model provides a kind of non-return valve assembly, and this non-return valve assembly includes non-return valve 1 and can be to described check
The valve plate of valve 1 applies to open power-assisted so that described valve plate is opened or applies to close power-assisted so that described valve plate is closed or makes described valve
Plate is in the actuator of free state, and described non-return valve assembly also includes the control list controlling described actuator action
Unit 3.
When the non-return valve assembly that this utility model provides is in use, such as apply in Steam Turbine, can be according to steamer
The operating mode of unit applies to open power-assisted so that valve plate is in open mode by actuator to the valve plate of non-return valve 1, or
To valve plate applying closedown power-assisted so that described valve plate is closed, or described valve plate is made to be in free state.Its
In make valve plate be in free state refer to actuator not to valve plate apply any active force and make valve plate only at fluid
Open or close under effect.Concrete, in the case of generator power is less, the forward flow of non-return valve 1 is less, at this moment may be used
Apply to open power-assisted to valve plate by actuator so that valve plate is opened, improve the stability of Smaller load stage non-return valve 1, with
Valve fluctuation when preventing low discharge, stability are the best and occur that valve plate easily produces with valve seat and collide, and thus damage the feelings of valve plate
Condition；And in the case of in valve plate needs closedown, inverted draft is less, actuator can apply to close power-assisted to valve plate, to inverse
Only the valve plate of valve plays the effect of power-assisted quick closedown, and add the sealing of valve when valve plate is fully closed tight for this power-assisted simultaneously
Property；And when generator power is bigger, actuator can not apply any active force to valve plate and make at the valve plate of non-return valve
In the state that freely swings, when there being positive draft, by positive draft, valve can be opened, and when having inverted draft, can lead to
Cross inverted draft make valve closing, valve be in free state can avoid in logic not comprehensively, can not time inverted draft occurs
The problem closing the tightness of valve and closedown in time, such valve plate is in free state can tackle any event of Steam Turbine
Barrier, contributes to the safety of equipment.
Therefore, the technical scheme that this utility model provides selects check by actuator according to the different operating modes of application
The use state of valve, can make non-return valve more stable in application process, and reliability is high.
In preferred implementation of the present utility model, described actuator includes cylinder 2, the piston in described cylinder 2
21 are connected with described valve plate, and control unit 3 can control valve plate unlatching by controlling the motion of piston 21, closes or be in freedom
State.
Concrete as it is shown in figure 1, the described valve plate of non-return valve 1 has the rotating shaft 14 rotated, described rotating shaft 14 connects
Having the crank 13 with weight 15, the piston 21 of cylinder 2 is connected with described crank 13, and the motion of piston 21 drives crank 13 to transport
Dynamic, thus drive rotating shaft 14 to rotate to open or close valve, and do not move at piston 21 and described valve is not applied any work
Time firmly, then valve is in free state.Wherein, crank 13, rotating shaft 14 and the structure of weight 15 and annexation are this area
Common technology, do not repeat them here.
For making piston movement, described actuator also includes that source of the gas is (as in Fig. 1, the arrow of the leftmost side is from source of the gas
Gas), the both sides of described cylinder 1 are connected with described source of the gas, between the side of described source of the gas and described cylinder 1 by pipeline respectively
The first pipeline 6 on be provided with the first electromagnetic valve 4, this first electromagnetic valve 4 is in order to control described first pipeline 6 break-make to control institute
State whether piston 21 applies to open power-assisted, the second pipeline 7 between the opposite side of described source of the gas and described cylinder 2 to described valve plate
On be provided with the second electromagnetic valve 5, described second electromagnetic valve 5 is in order to control described second pipeline 7 break-make to control described piston 21
Whether apply to close power-assisted to described valve plate.This first electromagnetic valve 4 and the second electromagnetic valve 5 are connected with described control unit 3, pass through
Described control unit 3 controls described first electromagnetic valve 4 and the power on/off of described second electromagnetic valve 5.Wherein the first electromagnetic valve 4 and
Two electromagnetic valves 5 are two-bit triplet normal-closed electromagnetic valve, and the i.e. first electromagnetic valve 4 and the second electromagnetic valve 5 default situations are that power-off is closed
Closed state.
Preferably, the first electromagnetic valve 4 is two or more for be arranged in parallel.Concrete as in Fig. 1, propping up at the second pipeline 7
Two the first electromagnetic valves 4 it have been arranged in parallel on road 71.When so one of which the first electromagnetic valve 4 is faulty or loses efficacy, separately
The first outer electromagnetic valve 4 works equally, will not delay actuator and apply to open power-assisted to valve plate.
Preferably, described source of the gas connects has main pipe rail 8, described first pipeline 6 and the second pipeline 7 to be connected to described house steward
Road 8, main pipe rail 8 is provided with pressure switch 9, and this pressure switch 9 can show the gas pressure in main pipe rail 8, if gas pressure
Power is less than setting value, namely when flatus, power gas source deficiency, then the first electromagnetic valve 4 and the second electromagnetic valve 5 can be made to break simultaneously
Electricity so that it is release, allows cylinder 2 both sides and atmosphere, and valve is in free state so that valve becomes non helping hand valve.
It should be noted that at this, the actuator controlling valve is not limited to the form of cylinder 2 in present embodiment, such as
Control valve also by hydraulic cylinder, it will also be appreciated that the rotating shaft that can control valve plate makes it rotate forward or reversely turns
Dynamic so that its device opened or closed.
Additionally, be additionally provided with source of the gas three linked piece, i.e. filter 10, air relief valve 11 and oil sprayer 12 on described main pipe rail 8.
The control process of the non-return valve assembly that this utility model provides is specific as follows:
Two the first electromagnetic valves 4 are energized, and during the second electromagnetic valve 5 dead electricity, the gas in source of the gas is entered by the first pipeline 6
The downside of cylinder 2, promotes piston 21 to move upward, and applies to open power-assisted with the valve to non-return valve 1, and valve is opened.
Two the first electromagnetic valve 4 dead electricity, and when the second electromagnetic valve 5 is energized, the gas in source of the gas is entered by the second pipeline 7
The upside of cylinder 2, promotes piston 21 to move downward, and applies to close power-assisted, valve closing with the valve to non-return valve 1.
When two the first electromagnetic valves 4 and the second electromagnetic valve 5 equal dead electricity, the upper and lower sides of cylinder 2 is all connected with air, valve
It is in non helping hand free state.At this moment, the positive draft through non-return valve can make valve be held open state, during removal of load,
Adverse current and valve plate deadweight will make valve closing, it is ensured that unit safety is with stable.
It addition, the control unit 3 in the non-return valve assembly provided in present embodiment is provided with manually and automatically two kinds of controls
Mode processed:
When valve carries out open and close test, (when applying in Steam Turbine, lock not yet hung by steam turbine, and high pressure turbine by is not yet
Under the situation put into), manual mode can be entered, now can pass through " closing valve " key or " valve opening door " key, valve is carried out open and close
Test.Owing to now steam turbine does not also enter vapour, high pressure turbine by is not yet turned on, and the open and close test of valve does not results in shadow to steam turbine
Ringing, the purpose of valve open/close test is only that correctness and the motility checking its action.
Equipment once enters normal operating condition, then use automated manner, and the operating condition automatically according to equipment controls inverse
Stop open and close and the free state of valve 1.
This utility model also provides for a kind of Steam Turbine, and described Steam Turbine includes high pressure cylinder, the aerofluxus of described high pressure cylinder
Mouth is provided with non-return valve assembly as above.
Below according to the different operating mode of Steam Turbine, the use state of non-return valve assembly is described.
1) when Steam Turbine uses high-pressure cylinder starting-up mode: steam turbine hangs lock, after high pressure bypass valve is closed, actuator pair
Non-return valve 1 applies to open power-assisted and makes it open, can prevent steam turbine startup stage, and Smaller load (unit load is less than 30%)
Stage positive draft is less, and stability is the best and occurs valve plate collision valve seat to cause the phenomenon damaged, it is possible to increase non-return valve 1
Stability (, at this moment for small guide vane, stability is the best for the non-return valve that non helping hand is opened, and often occurs valve plate collision valve seat to damage
Phenomenon).
2), when steam turbine uses senior school biology mode: after steam turbine hangs lock, when ventilation valve is opened, machine is performed
Structure applies to close power-assisted to non-return valve 1 makes it close, to improve the tightness that valve plate is closed.
After set grid-connection, 60 seconds ventilation valves of time delay cut out, and non-return valve 1 is opened under opening power-assisted effect, improves Smaller load rank
The stability of section non-return valve 1.
3), when generator power is less than 30%, what non-return valve 1 obtained cylinder 2 opens power-assisted, by valve together with positive draft
Door is opened, and when preventing underload, positive draft is not enough and causes the situation of the shock of valve plate.
4), when generator power is more than 30%, actuator does not applies any active force to non-return valve 1 so that it is be in freedom
State, pushes open non-return valve now by positive draft, and before and after valve, pressure reduction is the least, about at about 0.005Mpa.Free state
Any fault of steam turbine can be tackled, play equipment essential safety effect.
5) during the normal load carrying of steam turbine, generator main switch trip, and use FCB (house load operation mode,
Load < 30%) control model, now, for maintaining the main vapour pressure of boiler export, hp and lp bypass is opened, and ventilation valve is also simultaneously
Opening, non-return valve 1 is closed under closing power-assisted (when ventilation valve is opened, non-return flap obtains power-assisted) and the effect of reverse steam power,
Turbine speed band station service is controlled by middle pitch.Treat that cold reheat pressure drops to 0.828Mpa, high pitch take over control, in
Pitch returns memory aperture.Wait the most grid-connected.Grid-connected latter 1 minute, ventilation valve cut out, and high row pressure power improves, and non-return valve 1 is being beaten
Open and open under power-assisted and positive draft effect.
When being provided without FCB control model, when generator main switch trip, then steam turbine tripping operation (steam turbine does not hangs lock), high
Low voltage bypass is opened, and non-return valve 1 is free state, closes under inverted draft effect.
6) in properly functioning, owing to outer net circuit disconnects (disengaging with bulk power grid), generation removal of load:
After removal of load, load is more than 30%, and bypass is failure to actuate, and non-return valve is in free state, positive draft pushed away
To opening, steam turbine remains properly functioning.
After removal of load, load is less than 30%, and owing to ventilation valve does not leaves, no matter whether bypass action, and non-return valve 1 obtains cylinder
Forward opens power-assisted, is in open mode.If bypass is not opened, cold reheat steam pressure depends on high pressure cylinder steam discharge, and high pressure cylinder is arranged
Vapour can normally enter cold reheating steam pipe road, does not interferes with the properly functioning of steam turbine；If bypass is opened, (high and low bypass is all beaten
Open, for boiler pressure release, and for the FCB method of operation), when cold reheat steam pressure, more than 1MPa, (load is 30% correspondence
Pressure) can disappear with chain cylinder power-assisted, non-return valve is in free state, and when there being inverted draft, non-return valve 1 is at inverted draft
Effect is lower closes, and prevents high pressure cylinder from inversely entering vapour.Now operations staff should reduce cold reheat pressure as early as possible and makes non-return valve open, no
Then high pressure cylinder pressure ratio will quickly reach 1.7 and chaser.
7) when non-return valve controls equipment fault: owing to control equipment only controls power-assisted, compared with the steam-operating power of non-return valve,
Power-assisted only accounts for small part.Run out of steam source of the gas, or loses power of electromagnetic valve, and power-assisted also can lose, the highest row's check
Valve is in free state, still has non-return valve function, does not interferes with steam turbine properly functioning.
Preferred implementation of the present utility model is described in detail above in association with accompanying drawing, but, this utility model does not limit
Detail in above-mentioned embodiment, in technology concept of the present utility model, can be to skill of the present utility model
Art scheme carries out multiple simple variant, and these simple variant belong to protection domain of the present utility model.
It is further to note that each the concrete technical characteristic described in above-mentioned detailed description of the invention, at not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, this utility model is to respectively
Plant possible compound mode to illustrate the most separately.
Additionally, combination in any can also be carried out, as long as it is not disobeyed between various different embodiment of the present utility model
Carrying on the back thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (9)
1. a non-return valve assembly, it is characterised in that described non-return valve assembly includes non-return valve (1) and can be to described non-return valve
(1) valve plate applies to open power-assisted so that described valve plate is opened, applied to close power-assisted so that described valve plate is closed or makes described
Valve plate is in the actuator of free state, and described non-return valve assembly also includes the control controlling described actuator action
Unit (3).
Non-return valve assembly the most according to claim 1, it is characterised in that described actuator includes cylinder (2), described gas
Piston (21) in cylinder (2) is connected with described valve plate, and described control unit (3) controls the motion of described piston (21) to control institute
State valve plate to open, close or be in free state.
Non-return valve assembly the most according to claim 2, it is characterised in that described actuator also includes source of the gas, described gas
The both sides of cylinder (2) are connected with described source of the gas by pipeline respectively, the first pipe between the side of described source of the gas and described cylinder (2)
It is provided with on road (6) to control described first pipeline (6) break-make to control whether described piston applies to open to described valve plate
First electromagnetic valve (4) of power-assisted, the second pipeline (7) between the opposite side of described source of the gas and described cylinder is provided with to control
Make described second pipeline (7) break-make, to control described piston, whether described valve plate applies to close second electromagnetic valve (5) of power-assisted；
Described first electromagnetic valve (4) and described second electromagnetic valve (5) are connected with described control unit (3), control list by described
Unit (3) controls described first electromagnetic valve (4) and the power on/off of described second electromagnetic valve (5).
Non-return valve assembly the most according to claim 3, it is characterised in that described first electromagnetic valve (4) and described second electricity
Magnet valve (5) is two-bit triplet normal-closed electromagnetic valve.
Non-return valve assembly the most according to claim 3, it is characterised in that described first electromagnetic valve (4) is be arranged in parallel
Two or more.
6. according to the non-return valve assembly described in any one in claim 3-5, it is characterised in that described source of the gas connects house steward
Road (8), described first pipeline (6) and described second pipeline (7) be connected to described main pipe rail (8), and described main pipe rail sets on (8)
It is equipped with pressure switch (9).
Non-return valve assembly the most according to claim 6, it is characterised in that described main pipe rail is additionally provided with filter on (8)
(10), air relief valve (11) and oil sprayer (12).
8. according to the non-return valve assembly described in any one in claim 2-5, it is characterised in that the institute of described non-return valve (1)
Stating the rotating shaft (14) that valve plate has to rotate, the upper connection of described rotating shaft (14) has the crank (13) with weight (15), described
Piston (21) is connected with described crank (13).
9. a Steam Turbine, it is characterised in that described Steam Turbine includes that high pressure cylinder, the air vent of described high pressure cylinder are provided with
According to the non-return valve assembly described in any one in claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620429394.7U CN205663458U (en) | 2016-05-12 | 2016-05-12 | Check valve assembly and turbine unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620429394.7U CN205663458U (en) | 2016-05-12 | 2016-05-12 | Check valve assembly and turbine unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205663458U true CN205663458U (en) | 2016-10-26 |
Family
ID=57160104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620429394.7U Active CN205663458U (en) | 2016-05-12 | 2016-05-12 | Check valve assembly and turbine unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205663458U (en) |
-
2016
- 2016-05-12 CN CN201620429394.7U patent/CN205663458U/en active Active
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |