CN109163101A - A kind of implementation method for the exhaust capacity improving air inlet and exhaust valve - Google Patents
A kind of implementation method for the exhaust capacity improving air inlet and exhaust valve Download PDFInfo
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- CN109163101A CN109163101A CN201811293375.6A CN201811293375A CN109163101A CN 109163101 A CN109163101 A CN 109163101A CN 201811293375 A CN201811293375 A CN 201811293375A CN 109163101 A CN109163101 A CN 109163101A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/14—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with ball-shaped valve member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/54—Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
- F16K47/023—Means in valves for absorbing fluid energy for preventing water-hammer or noise for preventing water-hammer, e.g. damping of the valve movement
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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Abstract
The present invention discloses a kind of implementation method of exhaust capacity for improving air inlet and exhaust valve, based on the foundation of air inlet and exhaust valve streamline mathematical model, carries out theoretical capacity for water system and calculates, the determination of conventional air inlet and exhaust valve model, specification and calculates extraction flow coefficient；Design same specification intake and exhaust runner is fairshaped variable cross-section air inlet and exhaust valve, tests on exhaust performance test platform, records and calculates actual displacement and extraction flow coefficient.Test proves that variable cross-section air inlet and exhaust valve exhaust capacity significantly improves, its bore and quantity can be reduced under the premise of meeting exhaust requirements in this way, reduce investment, improve the anti-cavitation performance of interior element, prolong the service life, solve air inlet and exhaust valve type selecting it is improper caused by pipe explosion accident；Be put forward for the first time and to demonstrate air inlet and exhaust valve inside and outside differential pressure different, extraction flow coefficient also different viewpoint, for China's water supply industry type selecting standard improve and the formulation of production technical standard provides foundation, be of great significance to ensureing that pipe safety is run.
Description
Technical field
The invention belongs to the type selecting fields of air inlet and exhaust valve, and in particular to a kind of realization for the exhaust capacity for improving air inlet and exhaust valve
Method.
Background technique
Air inlet and exhaust valve research starts from or so the 15th century sixties, in recent years, mathematical modulo of the domestic and foreign scholars from air inlet and exhaust valve
Type, protection effect, characterisitic parameter and rules of type selection etc. are furtherd investigate, a large amount of studies have shown that correctly designing, selecting
Selecting and install air inlet and exhaust valve is the effective solution for ensureing the first water-filling of Long-distance Water Transmission Pipeline, the abundant intake and exhaust of accidental shutdown
One of.Air inlet and exhaust valve have many advantages, such as simple structure, low cost, it is easy for installation, do not limited by mounting condition, China is common at present
Air inlet and exhaust valve be divided into 3 classes by function and its operation form: high pressure micro exhaust valve, low-voltage high speed air inlet and exhaust valve and compound
(combination) formula air inlet and exhaust valve.Combined type air inlet and exhaust valve has the function of high pressure micro exhaust valve and a large amount of air inlet and exhaust valves of low pressure simultaneously
Can, to prevent water-filling excessive velocities from generating water hammer, many combined type air inlet and exhaust valves are equipped with water hammer-resistant component, have fast-opening slowly-closing function
Energy and accessory.Air inlet and exhaust valve with buffer gear, can be to avoid floating ball is blown afloat by air-flow and makes the air inlet and exhaust valve row of losing suddenly
Gas ability, so that high pressure water hammer bring pipe explosion accident occurs caused by reduction is closed suddenly because of air inlet and exhaust valve.Due to intake and exhaust
Calculating error, the type selecting of valve be improper cause pipeline intake and exhaust unsmooth the pipe explosion accident to caused by is commonplace.Such as northwest
City's pumping plant waterline, pipe range 12km, caliber DN1150, maximum static pressure 39m water column, 3 kinds of installation is different types of floating on pipeline
Ball-type exhaust valve, water flowing are run 40 days booster 3 times, later experiment discovery, the floating ball type discharge valve capacity wretched insufficiency of selection.
North China big city 1 year booster more than 400 times according to statistics, northwest city year booster more than 900 times.Therefore, how to have air inlet and exhaust valve
More sufficient intake and exhaust amount is the important research direction for preventing accident from occurring.
Combined type air inlet and exhaust valve is current optimal pipeline protecting water hammer valve.The big a large amount of intake and exhaust in aperture, microstome are micro-
Amount exhaust is the basic function of combined type air inlet and exhaust valve, and floating ball structure is its main member, and floating ball seat is in floating ball under normal circumstances
On pallet.When blank pipe water-filling, air is upward along floating ball tray bottom, realizes from floating ball surrounding by valve seat heel row to atmosphere
A large amount of degassing functions, after rapid, high volume is vented to setting pressure, then the slowly remaining whole minimum gas of discharge；After air is drained,
Water enters valve body, and floating ball floats under the buoyancy of water closes big aperture, and small exhaust outlet continues to be vented.Pipeline emptying or booster sluice
When, floating ball falls rapidly, timely inspiration air, destroys pipeline vacuum, when there is water column to make up, buffer board is closed in advance, is shut off
In pipeline, valve is vented most of air on a small quantity, by air partition, prevents water column from making up, makes water hammer up to eliminate.It closes
During closing, since the pressure of big small de-air hole acts on difference, the floating ball of gross blow hole first jacks up closing, then turns off aperture,
Delay fully closed process, mitigates pressure when water column makes up again and rise.
Research is improved according to Wylie and Streeter et al. and succession, it is known that the intake and exhaust ability of air inlet and exhaust valve depends on
In pipe inside and outside differential pressure, gas temperature.Its essence is the intake and exhaust requirement for meeting pressure piping and being safely operated, therefore in pressure pipeline
Under booting, normal operation and accident condition, air inlet and exhaust valve must flexibly realize intake and exhaust functions, and this point is air inlet and exhaust valve design
Essential technique requirement.
Therefore, on the basis of the adiabatic process of air inlet and exhaust valve intake and exhaust runner, constant temperature process, polytropic process analysis, research
The changing rule of cross section of fluid channel product, air velocity, mass flow, pressure and temperature and Mach number, could make combined type into row
The realization of air valve intake and exhaust runner intake and exhaust functions is more abundant, and then protects pipeline safety.
Lasting discharge of the safe operation of pipeline dependent on air in pipeline.Gas is deposited in pipeline multinomial harm, first, drop
Low emptying effectiveness, causes water delivery to be interrupted；Second, pipeline is caused to generate water hammer, gas explosion, water pump, valve, pipeline, gauge are threatened
The operational safety of table, or even jeopardize personal safety；Third, the measurement instruments such as water meter, pressure gauge is caused to generate measurement error；Its
Four, cause corrosion and cavitation of pipeline and equipment etc..Wherein, column separation phenomenon is the worst operating condition of pipeline water hammer.Cause
This, the intake and exhaust design of hydraulic pipeline increasingly causes the attention in relation to water hammer expert and design engineer.
Low pressure exhaust process is divided into two stages by traditional air inlet and exhaust valve runner design technical requirements: 1) when low voltage difference at full speed
Exhaust；2) exhaust velocity is limited when higher differential pressure, prevents to make water hammer up, line pressure is caused to increase；3) water hammer etc. is eliminated
Impact of the pressure oscillation aggravated under special operation condition because full speed is vented to system.Buffer board (throttling set) is mounted on intake and exhaust
Outside valve outlet, classification opens or closes flap mouth, can control pipeline by adjusting the size of the venthole of buffer board
When water-filling or capacity that water column makes up；By reducing the influence of hydraulic blow to the control of capacity, smoothly close into
Exhaust valve.Valve flowing channel design meets CJ/T 19,11719 standard of GB/T regulation, and valve channel diameter is designed using full-bore,
Valve seat orifice is consistent with valve channel, and valve body wall thickness meets GB regulation, carries out Stress Check using SolidWorks, ANSYS.
As shown in Figures 1 and 2, after traditional air inlet and exhaust valve design valve body uses cylindrical type, inner air tube to flow into valve body, air
Vortex is often separated and generated with boundary, inside vortex region, turbulent fluctuation aggravation, while constantly having matter between mainstream and vortex region
Amount and energy exchange, and by the friction and a large amount of mechanical energy of sharp impacts consumption between quality and particle, reduce intake and exhaust effect
Rate, inner air tube cannot be discharged in time, and managing interior negative pressure can not destroy in time, be affected to the safe operation of aqueduct；
In addition, the movement of air inlet and exhaust valve floating ball certainly exists delay when generating negative pressure in pipe, the problem of cavitation of conventional runner also when have hair
Raw, with the increase of the operation time limit, intake and exhaust performance sharply declines or even akinesia, seriously jeopardizes project safety.
Summary of the invention
The present invention solves the deficiencies in the prior art, provides a kind of intake and exhaust functions that can improve air inlet and exhaust valve, and make
The abundant realization of the intake and exhaust functions of air inlet and exhaust valve is possible to reduce air inlet and exhaust valve bore and quantity, to reduce engineering, and reduces
Air inlet and exhaust valve inner part cavitation phenomenons extend air inlet and exhaust valve service life, provide safeguard for Pressure Piping Engineering safe operation
Improve the implementation method of the exhaust capacity of air inlet and exhaust valve.
Used technical solution is the present invention to achieve the goals above:
A kind of implementation method for the exhaust capacity improving air inlet and exhaust valve, comprising the following steps:
Based on the mechanism study of gaseous state parameter, air inlet and exhaust valve streamline mathematical model is established；For each water system,
Theoretical intake and exhaust amount is carried out according to air inlet and exhaust valve streamline mathematical model to calculate, is provided according to specification, and conventional intake and exhaust valve-type is carried out
Number, the determination of specification, and calculate extraction flow coefficient；Based on exhaust performance test platform, record calculates the intake and exhaust chosen
The actual displacement of valve；The intake and exhaust runner for designing same specification is fairshaped variable cross-section air inlet and exhaust valve, and is surveyed in exhaust performance
Examination platform is installed, and exhaust performance test platform is based on, and recording, test and calculating intake and exhaust runner is fairshaped variable cross-section
The actual displacement and extraction flow coefficient of air inlet and exhaust valve；Under conditions of completing same capacity, the choosing of variable cross-section air inlet and exhaust valve
With more small-bore.
Preferably, the air inlet and exhaust valve streamline mathematical model is as follows:
WhenWhen less than 1.892,
Wherein:It is real quality flow when inner air tube passes through air inlet and exhaust valve air exit, CdFor intake and exhaust
Theoretical Mass flow when inner air tube is by air inlet and exhaust valve air exit during discharge coefficient, i.e. real quality flow and discharge
Between relationship,For the absolute pressure of inner air tube, Av is air inlet and exhaust valve air exit section；R is gas constant, TaFor pipe
Interior Kelvin,For atmospheric pressure absolute pressure；
WhenWhen greater than 1.892,
By air inlet and exhaust valve streamline mathematical model it is found that intake and exhaust ability and intake and exhaust discharge coefficient are closely related, it is described into
Exhaust capacity improves exhaust capacity by using the air flow channel of air inlet and exhaust valve.
Fluid Control Equation is established:
Air velocity is fast in air inlet and exhaust valve runner, according to continuous media governing equation, establishes quality, flow and energy and keeps
Permanent equation further includes the equation of gas state, the characteristic curve of Turbulence Flow due to considering the compressibility and turbulent property of air
Equation is based on cartesian coordinate system, and ignoring masonry power and heat source influences, and carries out dimensionless processing, three-dimensional continuous media controlling party
The conservation form of Cheng Fangcheng is as follows:
In formula: Q is conserved quantity；E, F, G are circulation；Subscript v is sticky flux, and expression formula is as follows:
In formula: ρ is gas density；U, v, w are the flow velocity in x, y, z direction；E is the interior energy of unit quality；P is pressure；Q is
Flux of energy；ReFor Reynolds number；τ is stress tensor, and is equal to the sum of laminar flow and turbulent shear stress；Shear stress in all directions
It is as follows:
In formula:For laminar flow shear stress；For turbulent shear stress；K is tubulence energy；
Cause flux of energy formula as follows by heat transfer:
In formula: μlFor molecular viscosity coefficient；μtTurbulent flow viscosity；PrlFor Prandtl number；PrtFor turbulent Prandtl number；T
For temperature；γ is specific heats of gases ratio；Ma∞For free stream Mach number；
For the intake and exhaust runner characteristics of streamline for simulating variable cross-section air inlet and exhaust valve, data processing is carried out using RNG k- ε model.
Further, the variable cross-section air inlet and exhaust valve includes that there are the big aperture intake and exhaust of a large amount of intake and exhaust functions of low pressure to fill
It sets, with pre- protecting against shock water hammer and make the buffer unit of water hammer function, the bottom of the big aperture air inlet and outlet device and buffering up
Device connection.
Further, the big aperture air inlet and outlet device includes grate flow channel of the section by small-big-group at full-bore
Big aperture air inlet and exhaust valve body, any overflow section area of the grate flow channel is not less than the specification area of valve, and in valve body
Runner it is streamlined, floating ball moving up and down is provided in the big aperture air inlet and exhaust valve body, and in big aperture intake and exhaust
The bottom of valve body is equipped with floating ball pallet, valve seat is equipped at the top exit of big aperture air inlet and exhaust valve body, and set at the top of valve seat
There is gland.
Preferably, the sealing structure that the valve seat is combined using copper alloy sealing and rubber seal.
Preferably, floating ball is smooth spherical shape free floating ball.
Further, the buffer unit includes section by small-big-small buffering valve body, is set in the trimmer valve body
There is buffer board, is equipped with adapter tube at the top of buffering valve body, water hammer-resistant flap is cased on adapter tube, adapter tube upper end and valve body are located at macropore
Part connection between mouth air inlet and outlet device and buffer unit.
Big aperture air inlet and outlet device is made of big aperture air inlet and exhaust valve body, floating ball, valve seat, gland etc., and buffer unit is by delaying
Rush the composition such as valve body, buffer board.Flow passage structure using aerodynamic principle design, valve inner flow passage be designed as it is streamlined, will not
Interfere air outflow.
Big aperture air inlet and outlet device is floating ball structure type, and under normal circumstances, floating ball seat is on floating ball pallet.Blank pipe water-filling
When, air is upward along floating ball tray bottom, passes through from floating ball surrounding, by valve seat heel row to atmosphere, realizes a large amount of exhaust function
Energy；After air is drained, water enters valve body, and floating ball floats under the buoyancy of water closes big aperture intake and exhaust part.Pipeline emptying or
When booster sluices, floating ball falls rapidly, timely inspiration air, destroys pipeline vacuum, when there is water column to make up, buffer board closes in advance
It closes, shuts off most of air in pipeline, valve is vented on a small quantity, by air partition, prevents water column from making up, is made up to eliminate
Water hammer.Big aperture intake and exhaust runner is designed using full-bore, and any overflow section area of runner is not less than valve specification area, is filled
Code insurance demonstrate,proves intake and exhaust requirement.
Further, the exhaust performance test platform includes Roots blower, silencing apparatus, relief valve, first pressure
Transmitter, fairing, temperature sensor, differential pressure transmitter, integrated hole flowmeter, air inlet and exhaust valve V1, V2, V3, V4,
V5, V6, V7, air inlet and exhaust valve V1 are connected by the air inlet of air inlet pipe and Roots blower, the exhaust outlet of Roots blower with disappear
The air inlet of acoustic device connects, and the gas outlet of silencing apparatus is connect with first pipe, relief valve, air inlet and exhaust valve V2, fairing,
Integrated hole flowmeter is successively set in first pipe from the near to the distant away from silencing apparatus, between relief valve and air inlet and exhaust valve V2
Pipeline be equipped with blow vent and the blind flange for closing the blow vent, air-breathing test when blind flange open, air inlet and exhaust valve V3
One end be connected to the part between air inlet and exhaust valve V2 and fairing of first pipe, the other end of air inlet and exhaust valve V3 with
One end connection of first flange reducer pipe, the other end of first flange reducer pipe test valve with the first air-breathing by the first upright pipe
Connection, is connected with first pressure transmitter on the first upright pipe, first pipe be located at air inlet and exhaust valve V2 and air inlet and exhaust valve V3 it
Between the part branch pipe that leads to atmosphere with one be connected to, air inlet and exhaust valve V6 and air inlet and exhaust valve V7 have been installed in parallel on the branch pipe, into row
One end of air valve V5 is connect with first pipe, and the other end connect by flange bending with one end of second flange reducer pipe, second
The other end of flange reducer pipe is connect by the second upright pipe with the second air-breathing test valve, and the is connected on the second upright pipe
Two pressure transmitters, the pipeline between fairing and integrated hole flowmeter are equipped with temperature sensor, integral type orifice plate
It is additionally provided with differential pressure transmitter on the pipeline of flowmeter two sides, is set on the pipeline between integrated hole flowmeter and air inlet and exhaust valve V5
It is equipped with spare interface and the blind flange for closing the spare interface, one end of air inlet and exhaust valve V4 is connected to integral type orifice flow
Between meter and air inlet and exhaust valve V5 on pipeline, the other end of air inlet and exhaust valve V4 and one end of second pipe are connected, second pipe it is another
One end is connected by one end of third flange reducer pipe, and the other end of third flange reducer pipe is connected by connecting tube and air inlet pipe
It connects.
Preferably, the air inlet of the silencing apparatus is connected by the exhaust outlet of elastomeric joint and Roots blower.
The invention has the following advantages that
1, intake and exhaust performance is improved:
It is not only determined by pipe internal and external temperature with pressure according to air inlet and exhaust valve streamline mathematical model intake and exhaust ability, it is real
There are deviations for border intake and exhaust ability and theoretical intake and exhaust ability, by law of conservation of energy it is found that can lose stream in intake and exhaust runner
It takes offence the part kinetic energy of body, kinetic energy rejection is bigger, cannot embody the intake and exhaust functions of air inlet and exhaust valve.
Fluent is widely used in the related field such as fluid in CFD, as calculating instrument, variable section runner into
On the basis of exhaust valve runner Curve guide impeller, grid dividing, model foundation and analogue simulation are carried out.Improve gas in runner
Flow regime reduces runner interior air-flow vortex and occurs, to reduce energy loss, can preferably improve intake and exhaust performance；
2, problem of cavitation is reduced, air inlet and exhaust valve service life is extended；
First, in air inlet and exhaust valve when floating ball movement, the water flow flow at high speed in runner can generate cavitation；Second, manage interior produce
Raw negative pressure floating ball movement has certain delay, and the underwater bubble that negative pressure makes in runner is precipitated, and when floating ball is fallen, overpressure increases,
Bubble collapse generates cavitation to runner and runner inner part.It sets streamlined for runner, reduces negative pressuren zone, can be effectively relieved
Problem of cavitation extends air inlet and exhaust valve service life.
3. reducing air inlet and exhaust valve type selecting bore, construction investment is reduced
Novel air inlet and exhaust valve based on variable section runner design has more fully intake and exhaust ability, with conventional air inlet and exhaust valve
It compares, under the premise of realizing same intake and exhaust amount, can choose more small-bore, it is also possible to reduce air inlet and exhaust valve quantity, reduce
Engineering, and air inlet and exhaust valve inner part cavitation phenomenons are reduced, extend air inlet and exhaust valve service life, is safely operated for Pressure Piping Engineering
It provides safeguard.
Present invention firstly provides dynamic intake and exhaust discharge coefficient concept and how proper use of intake and exhaust discharge coefficient, move
The introduction of state intake and exhaust discharge coefficient can make up the problem for lacking intake and exhaust discharge coefficient application method in domestic specification；It is compound
The basic thought of formula air inlet and exhaust valve intake and exhaust runner variable cross-section design, gives full play to the intake and exhaust functions of combined type air inlet and exhaust valve；
The basic thought of combined type air inlet and exhaust valve intake and exhaust runner variable cross-section design is the excellent of combined type intake and exhaust valve intake and exhaust runner
Change design and main technical foundation is provided.The present invention be the revision of China's water supply industry air inlet and exhaust valve type selecting standard it is perfect, into row
The formulation of air valve production technical standard provides technical basis, therefore this project ensures that pressure pipeline safe and reliable operation has
Important meaning.
Detailed description of the invention
Fig. 1 is gas theory motion pattern in air inlet and exhaust valve；
Fig. 2 is intake and exhaust runner figure in traditional air inlet and exhaust valve；
Fig. 3 is the vertical profile structural schematic diagram of variable cross-section air inlet and exhaust valve；
Fig. 4 is the intake and exhaust runner figure of variable cross-section air inlet and exhaust valve；
Fig. 5 is degassing function test platform schematic view of the front view；
Fig. 6 is degassing function test platform overlooking structure diagram；
Fig. 7 is DN150 air inlet and exhaust valve theory capacity, specification provides capacity and its exhaust coefficient curve；
Fig. 8 provides variable cross-section air inlet and exhaust valve capacity and its exhaust coefficient curve for theoretical capacity, specification.
Description of symbols: 1, Roots blower；2, silencing apparatus；3, relief valve；4, pressure transmitter；5, rectification dress
It sets；6, temperature sensor；7, differential pressure transmitter；8, integrated hole flowmeter；9, blind flange, 10, flange bending；11, flange
Reducer pipe；12, upright pipe；13, air-breathing tests valve；14, elastomeric joint；15, first pipe；16, second pipe；17, third method
Blue reducer pipe；18, connecting tube；19, air inlet pipe；20, valve body is buffered；21, buffer board；22, big aperture air inlet and exhaust valve body；23, valve
Seat；24, floating ball；25, floating ball pallet；26, gland.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Illustrate: in the present invention, " low pressure " is typically referred under the conditions of first water-filling or emptying；It is " a large amount of " to be and " micro "
Corresponding concept, micro air inlet and exhaust valve intake and exhaust be it is micro, Power Hi-speed intake and exhaust are a large amount of；AWWA M51
In (American Water Works Association standard), heavy caliber air inlet and exhaust valve also refers to Power Hi-speed (and the portion that is innovated of the present invention
Point), general aperture 10-150mm is big aperture air inlet and exhaust valve.
" intake and exhaust discharge coefficient " is referred to as " intake and exhaust coefficient "；" extraction flow coefficient " is referred to as " exhaust coefficient ".
The implementation method of the exhaust capacity of the raising air inlet and exhaust valve of the present embodiment based on gaseous state the following steps are included: joined
Several mechanism study establishes air inlet and exhaust valve streamline mathematical model；For each water system, according to air inlet and exhaust valve streamline mathematical modulo
Type carries out theoretical intake and exhaust amount and calculates, according to the regulation of specification CJT 217-2013 feedwater piping Combined type air inlet,
The determination of conventional air inlet and exhaust valve model, specification is carried out, and calculates extraction flow coefficient；Based on exhaust performance test platform, note
Record, the actual displacement for calculating the air inlet and exhaust valve chosen；The intake and exhaust runner for designing same specification is fairshaped variable cross-section into row
Air valve, and installed in exhaust performance test platform, it is based on exhaust performance test platform, records, test and calculate intake and exhaust
Runner is the actual displacement and extraction flow coefficient of fairshaped variable cross-section air inlet and exhaust valve；In the condition for completing same capacity
Under, variable cross-section air inlet and exhaust valve is selected more small-bore.Under the premise of guaranteeing water system safety, test proves variable cross-section intake and exhaust
Valve exhaust ability significantly improves, and is mainly reflected in greatly improving for extraction flow coefficient；Under the premise of meeting exhaust requirements in this way,
It can reduce air inlet and exhaust valve bore and quantity, to reduce construction investment, reduce negative pressuren zone and improve the anti-vapour of exhaust valve inner part
Erosion ability extends air inlet and exhaust valve service life.
Further, the air inlet and exhaust valve streamline mathematical model is as follows:
Air inlet and exhaust valve air flows into, flows out the flowing for being similar to nozzle air, according to the mentioned vacation of Wylie and Streeter
If carrying out mathematical model foundation to nozzle:
Energy equation:
Wherein k is adiabatic exponent (air k=1.4), and R is gas constant, and T is temperature, and v is speed；It can be obtained by integral:
v2For outlet air flow rate,For inlet air absolute pressure, ρ1For inlet air density,Outlet air is absolute
Pressure, T1For inlet air temperature；
Continuity equation is substituted into obtain:
Wherein,Pass through Theoretical Mass flow when air inlet and exhaust valve air exit, A for inner air tube2For air inlet and exhaust valve row
Gas outlet；
This expression formula provides " upper limit value " corresponding to real quality flow, because it is assumed that the constant entropy of air changes
It is completely reversibility；
In fact, due to friction and turbulent flow, process be it is irreversible, true mass flow is lower:
If CdFor intake and exhaust discharge coefficient, i.e. real quality flow is arranged with inner air tube during ejection by air inlet and exhaust valve
The relationship between Theoretical Mass flow when gas exports is worked as then when being subsonic speed by the flow of air inlet and exhaust valveIt is less than
1.892 when,
Wherein,Pass through real quality flow when air inlet and exhaust valve air exit for inner air tube,For in pipe
The absolute pressure of air, Av are air inlet and exhaust valve air exit section,Atmospheric pressure absolute pressure；
WhenWhen greater than 1.892, since supersonic flow cannot be present in convergent nozzle, sound wave is reached at outflux
Condition, and air velocity is kept constant；In this case, it is assumed that the air themperature in pipeline remains unchanged, then there is body
Product flow remains unchanged, but mass flow is variation, and mass flow increases with the increase of pipeline pressure, this also increases
Atmospheric density, therefore, whenWhen greater than 1.892,
By air inlet and exhaust valve streamline mathematical model it is found that intake and exhaust ability and intake and exhaust discharge coefficient are closely related, it is described into
Exhaust capacity carries out raising exhaust capacity by using the air flow channel of air inlet and exhaust valve；
Fluid Control Equation is established:
Air velocity is fast in air inlet and exhaust valve runner, according to continuous media governing equation (N-S equation), establishes quality, flow
And energy conservation equation further includes the equation of gas state, more turbulent flow due to considering the compressibility and turbulent property of air
Dynamic characteristic strips equation is based on cartesian coordinate system, and ignoring masonry power and heat source influences, and carries out dimensionless processing, three dimensional N-S side
The conservation form of journey is as follows:
In formula: Q is conserved quantity；E, F, G are circulation；Subscript v is sticky flux, and expression formula is as follows:
In formula: ρ is gas density；U, v, w are the flow velocity in x, y, z direction；E is the interior energy of unit quality；P is pressure；Q is
Flux of energy；ReFor Reynolds number；τ is stress tensor, and is equal to the sum of laminar flow and turbulent shear stress；Shear stress in all directions
It is as follows:
In formula:For laminar flow shear stress；For turbulent shear stress；K is tubulence energy；
Cause flux of energy formula as follows by heat transfer:
In formula: μlFor molecular viscosity coefficient；μtTurbulent flow viscosity；PrlFor Prandtl number；PrtFor turbulent Prandtl number；T
For temperature；γ is specific heats of gases ratio；Ma∞For free stream Mach number；
For the intake and exhaust runner characteristics of streamline for simulating variable cross-section air inlet and exhaust valve, data processing is carried out using RNG k- ε model.
As shown in Figure 3 to Figure 4, the variable cross-section air inlet and exhaust valve include have the big aperture of a large amount of intake and exhaust functions of low pressure into
Exhaust apparatus with pre- protecting against shock water hammer and makes the buffer unit of water hammer function, the bottom of the big aperture air inlet and outlet device up
It is connect with buffer unit.The big aperture air inlet and outlet device include section by small-big-group at full-bore grate flow channel it is big
Aperture intake and exhaust valve body 22, any overflow section area of the grate flow channel is not less than the specification area of valve, and valve is intracorporal
Runner is streamlined, floating ball 24 moving up and down is provided in big aperture air inlet and exhaust valve body 22, and in big aperture air inlet and exhaust valve
The bottom of body is equipped with floating ball pallet 25, and valve seat 23, and valve seat 23 are equipped at the top exit of big aperture air inlet and exhaust valve body 22
Top is equipped with gland 26；The buffer unit includes section by small-big-small buffering valve body 20, buffers to be equipped in valve body 20 and delay
Punching 21 is equipped with adapter tube at the top of buffering valve body 20, water hammer-resistant flap is cased on adapter tube, adapter tube upper end and valve body are located at macropore
Part connection between mouth air inlet and outlet device and buffer unit.
Preferably, sealing structure of the valve seat 23 using copper alloy sealing and rubber seal combination, good seal performance.
Preferably, floating ball 24 be smooth spherical shape free floating ball, be not oriented to, will not card resistance, floating ball 24 move it is complete from
By being not in the phenomenon that causing floating ball 24 to be unable to proper motion by sundries blocking.
Big aperture air inlet and outlet device has a large amount of intake and exhaust functions of low pressure, and buffer unit has pre- protecting against shock water hammer and makes up
Water hammer function, the structure of this combined type air inlet and exhaust valve ensure that the timely inlet and outlet when pipeline operates normally, in termination of pumping or pass
Effective protection makes water hammer up when valve.
Big aperture air inlet and outlet device is made of big aperture air inlet and exhaust valve body 22, floating ball 24, valve seat 23, gland 26 etc., is buffered
Device is made of buffering valve body 20, buffer board 21 etc..Flow passage structure is designed using aerodynamic principle, and valve inner flow passage is designed as
It is streamlined, air will not be interfered to flow out.
Big aperture air inlet and outlet device is floating ball structure type, and under normal circumstances, floating ball 24 on floating ball pallet 25.Blank pipe fills
When water, air is upward along 25 bottom of floating ball pallet, passes through from 24 surrounding of floating ball, by 23 heel row of valve seat to atmosphere, realizes big
Measure degassing function；After air is drained, water enters valve body, and floating ball 24 floats under the buoyancy of water closes big aperture intake and exhaust part.
When pipeline emptying or booster sluice, floating ball 24 falls rapidly, timely inspiration air, destroys pipeline vacuum, when there is water column to make up,
Buffer board 21 is closed in advance, shuts off most of air in pipeline, and valve is vented on a small quantity, by air partition, prevents water column more
It closes, makes water hammer up to eliminate.Big aperture intake and exhaust runner is designed using full-bore, and any overflow section area of runner is not less than
Valve specification area, fully ensures that intake and exhaust requirement.
As shown in FIG. 5 and 6, further, the exhaust performance test platform includes Roots blower 1, silencing apparatus
(FX- Φ 350) 2, relief valve 3, first pressure transmitter (MC15A) 4, fairing (ZLQ-DN350) 5, temperature sensor
(WZP100) 6, differential pressure transmitter (MC1570A) 7, integrated hole flowmeter (LT-LG) 8, air inlet and exhaust valve V1, V2, V3, V4,
V5, V6, V7, air inlet and exhaust valve V1 are connect by air inlet pipe 19 with the air inlet of Roots blower 1, the exhaust outlet of Roots blower 1
Connect with the air inlet of silencing apparatus 2, the gas outlet of silencing apparatus 2 is connect with first pipe 15, relief valve 3, air inlet and exhaust valve V2,
Fairing (ZLQ-DN350) 5, integrated hole flowmeter (LT-LG) 8 are successively set on away from silencing apparatus 2 from the near to the distant
On one pipeline 15, the pipeline between relief valve 3 and air inlet and exhaust valve V2 is equipped with blow vent and the flange for closing the blow vent
Lid, blind flange 9 is opened when air-breathing is tested, and one end of air inlet and exhaust valve V3 and first pipe are located at air inlet and exhaust valve V2 and fairing
(ZLQ-DN350) the part connection between 5, the other end of air inlet and exhaust valve V3 connect with one end of first flange reducer pipe 11, the
The other end of one flange reducer pipe 11 is tested valve 13 with the first air-breathing by the first upright pipe 12 and is connect, and connects on the first upright pipe 12
Be connected to first pressure transmitter (MC15A) 4, the part between air inlet and exhaust valve V2 and air inlet and exhaust valve V3 of first pipe 15 with
One leads to the branch pipe connection of atmosphere, has been installed in parallel air inlet and exhaust valve V6 and air inlet and exhaust valve V7 on the branch pipe, and the one of air inlet and exhaust valve V5
End is connect with first pipe 15, and the other end is connect by flange bending 10 with one end of second flange reducer pipe, second flange becomes
The other end of diameter pipe is tested valve with the second air-breathing by the second upright pipe and is connect, and is connected with second pressure on the second upright pipe
Transmitter (MC15A), the pipeline between fairing (ZLQ-DN350) 5 and integrated hole flowmeter (LT-LG) 8 are equipped with
Temperature sensor (WZP100) 6 is additionally provided with differential pressure transmitter on the pipeline of 8 two sides of integrated hole flowmeter (LT-LG)
(MC1570A) 7, spare interface and use are provided on the pipeline between integrated hole flowmeter (LT-LG) 8 and air inlet and exhaust valve V5
In the blind flange for closing the spare interface, one end of air inlet and exhaust valve V4 be connected to integrated hole flowmeter (LT-LG) 8 with into row
Between air valve V5 on pipeline, the other end of air inlet and exhaust valve V4 is connect with one end of second pipe 16, the other end of second pipe 16
It is connected by one end of third flange reducer pipe 17, the other end of third flange reducer pipe 17 passes through connecting tube 18 and air inlet pipe 19
Connection.
Preferably, the air inlet of the silencing apparatus (FX- Φ 350) 2 passes through the row of elastomeric joint 14 and Roots blower 1
Port connection.
It is vented Experimental Testing Procedures
1. valve and measuring instrumentss are mounted on pipeline by shown in Fig. 5 to 6, air inlet and exhaust valve V1, V2, V5 are opened, into row
Air valve V3, V4 are closed, air inlet and exhaust valve V6, V7 adjustment state, and the blind flange (DN350) 9 on blow vent is closed, integral type orifice plate stream
The blind flange (DN200) of the spare interface on pipeline between meter (LT-LG) 8 and air inlet and exhaust valve V5 is closed.By orifice flow
Meter connects signal wire, power supply line, opens import, outlet valve, and exits and entrances valve aperture is consistent.Blower is opened, into pipeline
Orifice flowmeter is opened in inflation, three valve group of stainless steel balances air inlet and exhaust valve, the slow air inlet and exhaust valve for opening orifice plate high-low pressure end
Door closes three intake and exhaust valve group of stainless steel after fluid is by flowmeter and balances air inlet and exhaust valve.
2. adjusting air inlet and exhaust valve V6 or V7, when testing different opening, the flow value Q of orifice flowmeter, record P-Q data are simultaneously
It is compared with calibration value.When deviation is no more than 1%, window flowmeter is accurate status.
Start to test 3. finishing to orifice flow meter calibrating, air inlet and exhaust valve V5 is closed, by test air air inlet and exhaust valve peace
It is opened again after at venting test.Gas passes through screens, orifice flowmeter, then to test intake and exhaust valve, measures its row
Tolerance.
4. adjust blower, when intake and exhaust valve inlet pressure P numerical value reaches after testing pressure, just start recording data.
(if desired reducing flow, adjust air inlet and exhaust valve V6, V7, air inlet and exhaust valve V7 coarse adjustment, air inlet and exhaust valve V6 fine adjustment).It observes into row
Air valve movement, and record P, Q value.
5. if there are intake and exhaust valve inlet pressure P value big ups and downs, and flow Q value tends to be steady；Or orifice plug quilt
Blow afloat one of (exhaust sound is sharpened, orifice plug collision clank is rung) two kinds of phenomenons, then it is assumed that largely exhaust has reached critical, this
When record corresponding data.Otherwise continue to increase compressor flow, repeat the above movement, until orifice plug is blown afloat.
6. orifice plug is blown afloat, a large amount of exhausts terminate, and carry out micro- row at this time.Floating ball is blown afloat when micro- row, and orifice plug falls,
Flow Q value reduces, and values of pressure p increases.Record corresponding data.After micro- row, floating ball falls, and pressure P reduces, and flow Q increases,
Into next exhaust cycle.
7. Roots blower 1 is closed in end to be tested.
Exhaust performance test result
Present invention is primarily intended to improve the intake and exhaust ability of air inlet and exhaust valve, the main of the intake and exhaust ability of exhaust valve is measured
Index is intake and exhaust discharge coefficient, be this is defined herein as: the ratio of practical intake and exhaust amount and theoretical intake and exhaust amount, below using above-mentioned
Mathematical model, based on inside and outside different pressure differential is managed in pressure water conveyer system, table 1 is using domestic specification " feedwater piping at present
Combined type air inlet (CJ/T 19-1513) " arrange by the FGP type Combined type air inlet that the bore provided is 150mm
Tolerance calculates the theoretical exhaust coefficient of air inlet and exhaust valve exhaust process；On the basis of variable cross-section capacity measured value, calculates to become and cut
Face air inlet and exhaust valve actual exhaust air coefficient, the results are shown in Table 1.Fig. 7 provides DN150 air inlet and exhaust valve theory capacity, specification to exhaust
Amount and its exhaust coefficient, Fig. 8 gives theoretical capacity, specification provides variable cross-section air inlet and exhaust valve capacity and its exhaust coefficient.
1 air inlet and exhaust valve capacity theoretical value of table and normal value
It can be seen from Fig. 6, Fig. 7 under same pressure differential intake and exhaust valve exhaust flow-meter calculation value, the value that provides of specification and
Comparison between variable cross-section intake and exhaust threshold values, and pipe inside and outside differential pressure is bigger, calculated value and measured value difference are bigger.In order to make into row
The capacity of air valve is closer practical in water hammer simulation calculates, and is introduced into extraction flow coefficient in model.It can be obtained by table 1
Air inlet and exhaust valve inside and outside differential pressure is different, and exhaust coefficient is not also identical, it should be a dynamic coefficient.
The above disclosure is only a preferred embodiment of the invention, cannot limit the right of the present invention with this certainly
Range, therefore according to equivalent variations made by scope of the present invention patent, it is still within the scope of the present invention.It should be appreciated that
Above description is intended to illustrative and not limiting.For example, above-described embodiment (and/or its aspect) can be in combination with one another.
In addition, enlightenment according to the present invention, which can make many remodeling, is suitable for specific situation or material without departing from of the invention
Range.By reading foregoing description, many other embodiments and remodeling in scope and spirit of the claims are to this field
Technical staff is obvious.
Claims (10)
1. a kind of implementation method for the exhaust capacity for improving air inlet and exhaust valve, which is characterized in that the mechanism based on gaseous state parameter
Research, establishes air inlet and exhaust valve streamline mathematical model；For each water system, managed according to air inlet and exhaust valve streamline mathematical model
It calculates by intake and exhaust amount, is provided according to specification, carry out the determination of conventional air inlet and exhaust valve model, specification, and calculate extraction flow
Coefficient；Based on exhaust performance test platform, record, the actual displacement for calculating the air inlet and exhaust valve chosen；Design same specification into
Grate flow channel is fairshaped variable cross-section air inlet and exhaust valve, and is installed in exhaust performance test platform, is surveyed based on exhaust performance
Platform is tried, record, test and calculates actual displacement and exhaust stream that intake and exhaust runner is fairshaped variable cross-section air inlet and exhaust valve
Coefficient of discharge；Under conditions of completing same capacity, variable cross-section air inlet and exhaust valve is selected more small-bore.
2. the implementation method of the exhaust capacity according to claim 1 for improving air inlet and exhaust valve, which is characterized in that described into row
Air valve streamline mathematical model is as follows:
WhenWhen less than 1.892,
Wherein:It is real quality flow when inner air tube passes through air inlet and exhaust valve air exit, CdFor intake and exhaust flow
Between Theoretical Mass flow when inner air tube is by air inlet and exhaust valve air exit during coefficient, i.e. real quality flow and discharge
Relationship,For the absolute pressure of inner air tube, Av is air inlet and exhaust valve air exit section；R is gas constant, TaFor in pipe
Kelvin,For atmospheric pressure absolute pressure；
WhenWhen greater than 1.892,
By air inlet and exhaust valve streamline mathematical model it is found that intake and exhaust ability and intake and exhaust discharge coefficient are closely related, the intake and exhaust
Ability improves exhaust capacity by using the air flow channel of air inlet and exhaust valve.
3. the implementation method of the exhaust capacity according to claim 2 for improving air inlet and exhaust valve, which is characterized in that described into row
The Fluid Control Equation of the air flow channel of air valve is established:
Air velocity is fast in air inlet and exhaust valve runner, according to continuous media governing equation, establishes quality, flow and conservation of energy side
Journey further includes the equation of gas state, the characteristic curve side of Turbulence Flow due to considering the compressibility and turbulent property of air
Journey is based on cartesian coordinate system, and ignoring masonry power and heat source influences, and carries out dimensionless processing, three-dimensional continuous media governing equation
Conservation form it is as follows:
In formula: Q is conserved quantity；E, F, G are circulation；Subscript v is sticky flux, and expression formula is as follows:
In formula: ρ is gas density；U, v, w are the flow velocity in x, y, z direction；E is the interior energy of unit quality；P is pressure；Q is energy
Flux；ReFor Reynolds number；τ is stress tensor, and is equal to the sum of laminar flow and turbulent shear stress；Shear stress in all directions is such as
Under:
In formula:For laminar flow shear stress；For turbulent shear stress；K is tubulence energy；
Cause flux of energy formula as follows by heat transfer:
In formula: μlFor molecular viscosity coefficient；μtTurbulent flow viscosity；PrlFor Prandtl number；PrtFor turbulent Prandtl number；T is temperature
Degree；γ is specific heats of gases ratio；Ma∞For free stream Mach number；
For the intake and exhaust runner characteristics of streamline for simulating variable cross-section air inlet and exhaust valve, data processing is carried out using RNG k- ε model.
4. the implementation method of the exhaust capacity according to claim 1 for improving air inlet and exhaust valve, which is characterized in that described become cuts
Face air inlet and exhaust valve includes the big aperture air inlet and outlet device with a large amount of intake and exhaust functions of low pressure, has pre- protecting against shock water hammer and make up
The bottom of the buffer unit of water hammer function, the big aperture air inlet and outlet device is connect with buffer unit.
5. the implementation method of the exhaust capacity according to claim 4 for improving air inlet and exhaust valve, which is characterized in that the macropore
Mouth air inlet and outlet device includes section by small-big-big aperture air inlet and exhaust valve body of the group at the grate flow channel of full-bore, the exhaust stream
Any overflow section area in road is not less than the specification area of valve, and the intracorporal runner of valve is streamlined, the big aperture into
It is provided with floating ball moving up and down in exhaust valve, and is equipped with floating ball pallet in the bottom of big aperture air inlet and exhaust valve body, big
Valve seat is equipped at the top exit of aperture intake and exhaust valve body, and the top of valve seat is equipped with gland.
6. the implementation method of the exhaust capacity according to claim 5 for improving air inlet and exhaust valve, which is characterized in that the valve seat
Using the sealing structure of copper alloy sealing and rubber seal combination.
7. the implementation method of the exhaust capacity according to claim 5 for improving air inlet and exhaust valve, which is characterized in that the floating ball
For smooth spherical shape free floating ball.
8. the implementation method of the exhaust capacity according to claim 4 for improving air inlet and exhaust valve, which is characterized in that the buffering
Device includes section by small-big-small buffering valve body, and the trimmer valve body is interior to be equipped with buffer board, sets at the top of buffering valve body
There is adapter tube, water hammer-resistant flap is cased on adapter tube, takes over upper end and valve body between big aperture air inlet and outlet device and buffer unit
Part connection.
9. the implementation method of the exhaust capacity according to claim 1 for improving air inlet and exhaust valve, which is characterized in that the exhaust
Testing Platform includes Roots blower, silencing apparatus, relief valve, first pressure transmitter, fairing, temperature sensing
Device, differential pressure transmitter, integrated hole flowmeter, air inlet and exhaust valve V1, V2, V3, V4, V5, V6, V7, air inlet and exhaust valve V1 by into
The connection of the air inlet of tracheae and Roots blower, the exhaust outlet of Roots blower and the air inlet of silencing apparatus connect, dress of eliminating the noise
The gas outlet set is connect with first pipe, and relief valve, air inlet and exhaust valve V2, fairing, integrated hole flowmeter are filled away from eliminating the noise
It sets and is successively set in first pipe from the near to the distant, the pipeline between relief valve and air inlet and exhaust valve V2 is equipped with blow vent and is used for
The blind flange of the blow vent is closed, the blind flange is opened when air-breathing is tested, one end of air inlet and exhaust valve V3 and being located at for first pipe
Part between air inlet and exhaust valve V2 and fairing is connected to, and the other end of air inlet and exhaust valve V3 and one end of first flange reducer pipe connect
Connect, the other end of first flange reducer pipe is connect by the first upright pipe with the first air-breathing test valve, connected on the first upright pipe
There is first pressure transmitter, atmosphere is led to one in the part between air inlet and exhaust valve V2 and air inlet and exhaust valve V3 of first pipe
Branch pipe is connected to, and has been installed in parallel air inlet and exhaust valve V6 and air inlet and exhaust valve V7, one end of air inlet and exhaust valve V5 and first pipe on the branch pipe
Connection, the other end is connect by flange bending with one end of second flange reducer pipe, the other end of second flange reducer pipe passes through
Second upright pipe is connect with the second air-breathing test valve, is connected with second pressure transmitter, fairing on the second upright pipe
Pipeline between integrated hole flowmeter is equipped with temperature sensor, also sets on the pipeline of integrated hole flowmeter two sides
There is differential pressure transmitter, spare interface is provided on the pipeline between integrated hole flowmeter and air inlet and exhaust valve V5 and for closing
The blind flange of the spare interface, one end of air inlet and exhaust valve V4 are connected to pipeline between integrated hole flowmeter and air inlet and exhaust valve V5
On, the other end of air inlet and exhaust valve V4 and one end of second pipe connect, and the other end of second pipe passes through third flange reducer pipe
One end connection, the other end of third flange reducer pipe connect by connecting tube with air inlet pipe.
10. the implementation method of the exhaust capacity according to claim 9 for improving air inlet and exhaust valve, which is characterized in that described to disappear
The air inlet of acoustic device is connected by the exhaust outlet of elastomeric joint and Roots blower.
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| CN110598342A (en) * | 2019-09-18 | 2019-12-20 | 中国水利水电科学研究院 | Method and device for detecting reasonability of setting of exhaust valve |
| CN112991625A (en) * | 2021-05-19 | 2021-06-18 | 天津赛恩能源技术股份有限公司 | Matrix type valve control water meter system and valve control method thereof |
| CN113483946A (en) * | 2021-06-01 | 2021-10-08 | 广西防城港核电有限公司 | Water filling and exhausting system and method for differential pressure transmitter |
| CN113503397A (en) * | 2021-08-18 | 2021-10-15 | 李燕彬 | Vacuum faucet |
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| CN113503397A (en) * | 2021-08-18 | 2021-10-15 | 李燕彬 | Vacuum faucet |
| CN113503397B (en) * | 2021-08-18 | 2023-04-11 | 李燕彬 | Vacuum faucet |
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| CN109163101B (en) | 2020-06-12 |
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