CN104455659B - Top steam exhaust electromagnetic pressure relief valve for main steam system of power station - Google Patents
Top steam exhaust electromagnetic pressure relief valve for main steam system of power station Download PDFInfo
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- CN104455659B CN104455659B CN201410755913.4A CN201410755913A CN104455659B CN 104455659 B CN104455659 B CN 104455659B CN 201410755913 A CN201410755913 A CN 201410755913A CN 104455659 B CN104455659 B CN 104455659B
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Classifications
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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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0644—One-way valve
- F16K31/0655—Lift valves
-
- 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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
- Lift Valve (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a top steam exhaust electromagnetic pressure relief valve for a main steam system of a power station, wherein the valve is a main valve and an auxiliary valve which are split, and the top of the valve is directly exhausted or steam is exhausted from two sides of the top of the valve; the main valve flap consists of a thermal valve flap and an outer valve flap, and a thermal compensation, elastic compensation and anti-blocking structure is arranged on the main valve flap; the guide sleeve adopts an assembly structure and is fixed through a pressing frame; the upper sides of the sealing surfaces of the main valve and the auxiliary valve are provided with condensed water containing structures; the sealing surface of the auxiliary valve adopts a spherical-conical surface structure and is provided with a thermal compensation groove; the middle cavities of the main valve and the auxiliary valve adopt a combined sealing structure; the upper end of the auxiliary valve is provided with a steam escape prevention structure; the related part in the valve is provided with a local structure which can improve the flow field characteristic. The main advantages are that: the valve has the advantages of no influence of condensed water and oxidation corrosion products on the sealing of the valve, strong compensation capability of the sealing surfaces of the main valve and the auxiliary valve, high sealing reliability, difficult blockage of the elastic clearance of the main valve flap, no external leakage of the middle cavities of the main valve and the auxiliary valve, reliable and convenient fixation of the guide sleeve, no steam escape during discharge, and less vibration and noise.
Description
Technical field
The present invention relates to a kind of valve mechanisms, and in particular to top row vapour electromagnetism is let out used in a kind of power station main steam system
The product structure of pressure valve.
Background technology
Electromagnetic relief valve is a kind of important safety relief valve of power station main steam (cross hot vapour) system, is one kind with electricity
The driving devices such as magnet driving guide's flap releases steam and the pilot-operated type valve that makes main valve clack act.Electromagnetic relief valve is mounted on
Before main steam spring safety valve, be main steam safety valve equalizing valve and protection valve, set by popping pressure value
The slightly below popping pressure of main steam safety valve is pressed when superpressure occurs in main steam but without the jump of opening for reaching main steam safety valve
Electromagnetic relief valve quickly opens discharge steam when force value, and the pressure of system is down to normal value, as avoids main steam safe as possible
Valve events make unit keep to maintain Performance And Reliability, the use for extending main steam safety valve and the maintenance cycle of safety valve
Enough safety assurance ability and balance and the stable operation for ensureing unit, and can be that may be needed together according to unit operation situation
Shi Jinhang's opens turbine by pass, reduces combustion intensity, the control of a series of complex such as steam water-level is maintained to win valuable buffering soon
Time is the important mating valve and critical valves of fired power generating unit.
The actual needs of pressure control when electromagnetic relief valve is according to unit starting and operation, can automatically and manually open
Valve can also pass through lock operation state；The control system of electromagnetic relief valve selects high-precision pressure switch (pressure sensor),
Controllable blowdown of a safety valve reaches 2%.It is with U.S.'s De Laisai-Kang Suo Reeds that solenoid blowout valve products application is more at present
(Dresser-Consolidated) and the product of the enterprises such as Crosby (Crosby) is that representative uses main valve clack sealing surface
Upward, the product of top row vapour, auxiliary valve fission side assembling structure (see Fig. 1 and Fig. 2).It is main for the electromagnetic relief valve of this structural shape
Advantage is that the structure of runner is relatively simple, valve body of main valve convenient for being processed using forging, thus be conducive to make valve keep compared with
High security reliability.
Due to product structure design, electromagnetic relief valve has become in the mating all kinds of valves of fired power generating unit at present
Always exist one of the critical valves of more serious problem.Existing main valve clack upward, top row vapour, auxiliary valve fission side dress electromagnetism let out
Pressure valve product existing in use disadvantage and problem have：1, due to discharge of steam, exhaust pipe and outlet connect
The inner cavity of flange can oxidation corrosion quickly, can especially occur quickly in exhaust passage when valve has certain leakage more serious
Corrosion phenomena because valve is top steam exhaust structure, the corrosion products such as oxide skin can fall or be gathered with the flowing of condensed water
Near main valve clack sealing surface, to be affected to the sealing of valve；2, top steam exhaust structure can make main valve clack upper end surface
There is condensed water to splash drop or accumulate condensed water, and the outside of main valve clack sealing surface is located at valve cavity, is in direct contact with high-temperature steam,
Thus on the inside of the inside part of main valve clack sealing surface or entire sealing surface with the outside of main valve clack sealing surface can therefore and generate compared with
The big temperature difference and so that sealing surface position is deformed even and crack, the use of valve is caused to be affected；3, the guide of auxiliary valve is close
Similarly there are problems that at cover it is above-mentioned this, can constantly have the different parts oozed under condensed water to sealing surface after steam discharge, make
Sealing surface position generates inhomogeneous deformation because of continuous local cooling, causes electromagnetic relief valve product generally existing in use
Auxiliary valve opens rear sealing surface for several times and starts occur leaking the phenomenon that this allows power station user to have a headache very much, and auxiliary valve occurs after leaking again
It can cause the back pressure deficiency of main valve clack that main valve clack sealing surface is then caused to leak；4, main valve clack and guide's valve clack sealing surface
Design is mostly the conventional integrated valve valve structure without thermal compensation ability.The main steam temperature of large capacity fired power generating unit is usually 540
~610 DEG C, for valve in working condition, the outside of valve clack sealing surface is main steam, and temperature is higher, and the inside of valve clack sealing surface
Because communicated with air temperature can be declined thus temperature be less than the outside of valve clack sealing surface, internal-external temperature difference causes to deform compared with conference
And influence valve seal；5, main valve clack and pilot valve flap seal face position using no thermal compensation ability conventional monoblock type flap knot
Structure, when sealing pair somewhere leaks, the medium leaked out is because drastically swelling heat absorption can make near sealing face leakage point volume
Temperature decline, unbalanced temperature change can cause again sealing surface generation inhomogeneous deformation to aggravate to leak；6, discharge is steamed
When vapour or when auxiliary valve has leakage, auxiliary valve upper end has steam effusion, in addition to that can affect production environment, and influences to drive
Outside the functional reliability of device, prior influence is that the high-temperature steam of effusion can make the machinery of the spring on the upside of auxiliary valve valve deck
Performance is affected, and elasticity reduces, to influence whether the sealing of auxiliary valve and the reliability of auxiliary valve closing motion, meeting when serious
Make to occur leaking greatly or making valve rod that can not close at sealing surface；7, the sealing reliability at valve body and valve seat mounting surface is poor, external leakage
Problem is more serious.The valve body of Crosby (Crosby) company electromagnetic relief valve product and valve seat location and the valve body of auxiliary valve
It is sealed using V-type metal o-ring (as shown in figure 12, piece number 32 is the V-type metal o-ring) with valve deck position,
And the product of De Laisai-Kang Suo Reeds (Dresser-Consolidated) company then uses the sealing of c-type metal o-ring (such as
Shown in Figure 13, piece number 33 is c-type metal o-ring), then soft graphite wound gasket is used to seal at the valve body valve deck of its auxiliary valve.V
Type or c-type metal o-ring generate seal pressure by itself elasticity tension and pressure self-sealing effect, but due to following
The influence of two factors, sealing reliability can not often be met the requirements：First, because the valve seat of said two products is adopted
Be mounted on valve body (see Fig. 1, Fig. 2) with the mode of threaded engagement, metal o-ring pre-pressing and generate initial sealing is than pressure
It is realized by screwing valve seat, since metal o-ring is made of stainless steel material, anti-scuffing function is poor, and valve seat
Or the anti-scuffing function of the bulk material of valve body is not also strong, thus during screwing seat compression metal o-ring,
Scratch phenomenon is easy tod produce at sealing ring and the contact surface of valve seat or valve body and influences to seal；Second is that because V-type or c-type metal are close
The contact area very little of seal and valve body and valve seat sealing surface, essentially line contact condition, when valve runs on worst hot case
When (main steam temperature of large capacity fired power generating unit be 540~610 DEG C), valve body, the intensity of seat material and hardness can decline, mould
Property increase, on valve body, valve seat with metal o-ring in line contact condition surface can because be pressurized generate plastic deformation due to it is recessed, make
Specific contact pressure declines, and sealing reliability is caused to reduce.Electromagnetic relief valve product sealing positions such as valve body, valve seat in installing and using
It is a more typical problem external leakage occur；When needing replacing sealing element, the price of an import metal o-ring can be high
Up to four to 50,000 yuan, and Lead Time is up to dozens of days, and the product repairing cost of power plant is made to greatly increase, maintenance cycle lengthens, system
Determine the difficulty of maintenance project and uncertain increase, larger impact is brought to the operating maintenance of power station unit.8, existing product
Fixed form and structure for the guide sleeve of main valve clack guide-localization in valve be usually by guide sleeve to be interference fitted
Mode is partially or completely pressed into and is fixed on supporting rack or on valve body (Fig. 1, Fig. 2), and the disadvantage present in this mode has：One
It is poor reliability, judder and collision, the disturbance of the flow at high speed medium and master that may occur when being easy because of steam discharge
The bite of flap and guide sleeve and make guide sleeve deviate from or part deviate from；Second is that assembly and repair inconvenience, processing request are high.9、
The structure of guide's sealing position：Since electromagnetic relief valve product is for the needs for the response speed for executing switching motion, used
Driving device (generally use solenoid actuated) nominal force it is smaller, along with existing electromagnetic relief valve product is basic
On be the drive mechanism that this is not appropriate for using the smaller lever construction of the amplification factor to power to transmit the drive of driving device
Power, thus so that valve rod is can be obtained thrust and be restricted；It is influenced by this factor, guide's sealing surface of existing product
Diameter be all designed smaller；Since guide's sealing surface is mainly to ensure to seal by top power on the medium after closing, thus
Smaller its of sealing surface diameter can be obtained that medium active force is also smaller, sealability is also poorer.The valve rod of existing product and
Guide's flap generally uses the design of split, due to smaller (such as existing product valve rod of the size of valve rod, flap and snap ring
Diameter at the axle journal of lower part is only less than 7mm), thus valve rod and guide's flap carry out group using split with assembling structure
The mode (Fig. 2) of dress, reliability can be poor, and along with guide's flap is whole hard alloy material, brittleness is very big, is bearing
The problems such as being susceptible to fracture at connection structure when returning the moment impact of seat, leads to valve cisco unity malfunction；Crosby
(Crosby) design of the product of company valve rod and guide's flap integral type despite the use of, but guide's sealing surface use it is flat
The structure (seal f ace width b=1mm) of face sealing, although facilitating the grinding of sealing surface, it is sealed compared with conical surface seal
Ability receives certain limitation；10, it is fixed to be used for guide's flap for the electromagnetic relief valve of valve rod and guide's flap split structure
Because being restricted by structure at the guide sleeve that position is oriented to, for pressure release and after opening, through-flow perforated area is less than normal, limits guide
Discharge of steam speed when flap is opened is to make Valve opening velocity be affected；11, there are many places to easily lead to for the runner of valve
Discharge of steam generates the position of more serious vortex when flowing, the medium on the downside of main valve inner support frame is from entrance side upwards toward support
At shunting in frame on the outside of hub, on the upside of main valve clack, near supporting rack dowel；For swiftly flowing gas medium, stream
Once there are more serious vortex in road, vibration and noise caused by media flow can be made to significantly increase, while strong shaken
The dynamic functional reliability that can make valve again and service life decline；12, as previously mentioned, existing top row vapour electromagnetic relief valve product
Main valve clack is not considered as compensation design, and sealing reliability of the sealing surface in worst hot case can be made to be affected, it is opposite and
Speech, the electromagnetic relief valve product for the auxiliary valve integral structure of both sides steam discharge, main valve that Japanese enterprises are produced is then in main valve flap seal
The structure design of thermal compensation is added in the structure in face, and the elevated-temperature seal reliability of valve sealing face can be made to be improved.But
The main valve valve structure of the electromagnetic relief valve with thermal compensation function in terms of structure design there is also some shortcomings,
So that the sealing structure of main valve clack can not give full play to its due effect：Be first, at main valve clack sealing surface although set up
Thermal compensation and elastic compensating structure, but at the only cone end elasticity tongue of the tapering of thermal valve valve it is relatively thin, have the elasticity being relatively good
Crooked deformability, and tapering becomes larger rapidly with cone angle is up then rigid, thus the reasonability of elastic compensating structure is not good enough, and it is close
Cover position is handled by quenching hardening, if relying primarily on cone end and providing elastic bending deflection compensation, is being born back
There are some problems for its reliability when seat impact；Secondly, it is not arranged outward at the cavity on the upside of main valve clack sealing surface elastic tongue
Through-hole, be closed and will be without high-temperature steam at the cavity when reaching preferable sealing state once flexible deformation gap location because being pressurized
It can enter, this will cause the thermal compensation function at main valve clack sealing surface to be lost substantially；In addition, main valve clack seals surface elastic tongue
Locate the flexible deformation gap of setting, which is in open configuration when main valve clack opens discharge steam, the opening in gap meet to
Medium inflow direction, the small impurity particle (such as small oxide skin, solder joint welding slag and other impurity) being present in discharge medium
It is easy to be embedded in flexible deformation gap to make the sealing condition of main valve clack sealing surface along the flow direction of media discharge
It is affected.
In order to solve the problems, such as deformation and leak this that main valve clack sealing surface position is brought by no thermal compensation ability, De Lai
Sai-Kang Suo Reeds (Dresser-Consolidated) company is outside the main valve clack sealing surface of its electromagnetic relief valve product (Fig. 2)
Side increases thermal compensation slot (see Fig. 3), and thermal compensation slot increases sealing surface nearby and the contact area of high-temperature steam and makes main valve
The Distance Shortened at sealing surface position and high-temperature steam is leaned in valve upper end, thus can have more heat transfers to be leaned on to main valve clack upper end
The position of sealing surface makes the temperature difference in outside in sealing surface reduce.Main valve clack helps to control by increasing above-mentioned thermal compensation slot
The deformation that sealing surface position is generated by the temperature difference, but since the intensity thus groove depth that need guarantee sealing surface position can be by certain
Limitation, this is but also the thermal compensation ability of the structure is difficult to really meet the requirements.
Invention content
In order to overcome above-mentioned many shortcomings present in existing structure and technology, the present invention to propose one kind not
Entering main valve clack sealing surface there are oxidation corrosion product, nearby influence valve seal and condensed water cause main valve and auxiliary valve to seal
The problem of face leaks can prevent main valve and lumen external leakage phenomenon, main valve and the auxiliary valve sealing surface of auxiliary valve and have completely
More sufficient thermal compensation ability and better seal reliability, main valve clack sealing surface position have stronger elastic compensating ability,
Flexible deformation gap at elastic tongue is not easy to be blocked, guide sleeve can be fixed reliably, vibration when discharging steam and
Noise smaller can effectively prevent steam from auxiliary valve valve deck in valve steam discharge or when certain leakage occurs in the interior sealing of auxiliary valve
Upper end escapes outward, and valve is enable preferably to meet the super (super-) critical of the especially modern large capacity of fired power generating unit, high parameter
The power station main steam system of the needs of fired power generating unit safe and reliable operation top steam discharge electromagnetic relief valve structure.
To achieve the goals above, the present invention uses following technical scheme：
A kind of power station main steam system top steam discharge electromagnetic relief valve, the electromagnetic relief valve main valve is point with auxiliary valve
Body formula structure, auxiliary valve are installed on the side of main valve, and the exhaust steam end that valve is used to discharge steam is located at the top-of main valve in main valve valve
The upper end of body is provided with steam exhaust structure body, and the downside of steam exhaust structure body is connected simultaneously with flange and bolt connection with valve body upper end
And compress valve seat；The structural shape of valve body is revolution build, is welded by upper and lower two parts, is provided in the middle part of valve body
Supporting rack for supporting and fixing the parts such as main valve clack, embedding upper and lower two parts for being sandwiched in valve body in outer ring of the annular of supporting rack
Between, the circular passage between the interior hub in middle section-of supporting rack and the outer ring of supporting rack passes through from bottom to top for medium,
Between interior hub and outer ring and multiple dowels are equipped with, position of the interior hub in valve body is made to be supported and be fixed.Valve is by driving
Dynamic device drives the valve rod of auxiliary valve to act, open guide's sealing structure and the main valve clack in main valve is made to open.The key of the present invention
Technical solution is：Main valve clack uses flap modular construction, flap component to be made of thermal valve valve and outer flap, thermal valve valve and outer flap
Be revolution build part, the two is concentric arrangement, thermal valve valve inside and outer flap outside, the two simultaneously with threaded engagement connection is
One；Thermal valve valve upper surface outer circumferential side is the valve clack sealing surface of circular ring shape, and thermal valve valve is provided with cone in the back side of valve clack sealing surface
Face, while the adjacent position on outer flap on the outside of the above-mentioned conical surface is also provided with the conical surface of identical taper, in flap group
When free state when part is in unassembled, there are small gaps between the above-mentioned two adjacent conical surface, and are in flap component
Then two conical surfaces are in contact when work condition state is pressurized；Elastic groove, the elastic groove packet are additionally provided at the conical surface of the thermal valve valve
Containing upper and lower step plane and cylindrical surface, with round-corner transition between cylindrical surface and upper and lower step plane.Outer flap is close to valve
The vertical height of upper surface at the outer diameter of flap seal face is higher than the vertical height of valve clack sealing surface.Positioned at the outside of flap component,
The guide sleeve of tubular for flap component guide-localization, lower end are installed positioning on supporting rack with cylindrical positioning surface, led
It is equipped with step surface to the outer circle of set, the boss lower plane on the outside of valve seat is additionally provided with pressure rack down, and pressure rack is to turn round build simultaneously
The through-flow window of window-of multiple perforations is machined in outer circle, for medium by flowing into inside outside, the upper and lower end face of pressure rack is distinguished
On step on boss lower plane on the outside of valve seat and guide sleeve outer circle between plane, after the position of pressure rack is fixed,
Make guide sleeve that can also be fixed on installation site simultaneously by the retaining position-limiting action of pressure rack.
Steam exhaust structure body positioned at valve body of main valve upper end, may be used the connecting flange with upper and lower flange end, and upper end connects
Acting flange when installing with the gland steam exhauster of side disposed thereon for connecting.
In order to which expected purpose is better achieved, the present invention also adds following further technical solutions simultaneously：
Steam exhaust structure body positioned at valve body of main valve upper end can also further use new structural shape-triplet type knot
Structure, in-between vertical channel shunt to form horizontal channel toward arranged on left and right sides direction upwards, and left and right horizontal channel is in both ends end
It being symmetrically arranged with connecting flange, being connected with the steam discharge elbow of both sides when for installing；The material of steam exhaust structure body is stainless steel
Material, left and right horizontal channel carry the taper being gradually reduced to interior diameter near aperture or aperture at both ends.
Cavity-main valve condensation hydroecium of annular is provided between steam exhaust structure body lower end and valve seat, the main valve is solidifying
Bear water platform of the room by plane on boss on the outside of valve seat and the valve seat outer circle on the upside of it and steam exhaust structure body intermediate vertical channel lower end
Rank hole is surrounded；Steam exhaust structure body intermediate vertical channel lower end is located at the aperture on the upside of valve seat at adjacent regions and is more than among valve seat
Aperture at the aperture of access opening upper end is stayed between the lumen orifice of steam exhaust structure body intermediate vertical channel lower end at the outer circle of valve seat upper end
There is the gap of annular that main valve condensation hydroecium is made to be connected with the inner cavity of steam exhaust structure body；It is compressed by steam exhaust structure body in valve seat convex
At plane and it is provided with gasket on platform.
The lower end of auxiliary valve valve deck is provided with guide's valve seat, guide's valve seat is connected and sealed with auxiliary valve valve deck, on auxiliary valve
The guide's sealing surface for executing switching motion is set up directly on the lower part of valve rod, and the valve rod with stem lower portion is provided on guide's valve seat
The sealing surface of sealing surface pairing；Valve stem seal face is spherical surface, and the sealing surface on guide's valve seat is then the downward conical surface in direction of dehiscing,
It is coincide with tangent state both when closing；Back side in valve stem seal face is provided with groove-thermal compensation slot of annular；It is close from valve rod
The outer diameter of cover is toward one section of cylindrical section is had, and in the cylindrical section, then outer diameter increase composition is led for the bearing of valve rod lower end still further below
To another section of cylindrical surface, the sealing surface of first guide valve seat is toward being arranged with and the above-mentioned circle being oriented to for the bearing of valve rod lower end
The cylindrical hole of cylinder cooperation；From between the cylindrical section of the upside of the above-mentioned cylindrical hole of guide's valve seat and valve stem seal face outer diameter down
Toroidal cavity it is outside, be drilled with uniformly distributed several through flow holes, be also drilled with toward above-mentioned toroidal cavity in valve rod lower face uniformly distributed
Several through flow holes.
It is equipped with the increased loudspeaker of diameter down in the lower end of the intermediate exhaust passage of the auxiliary valve valve deck on the upside of pilot valve seat
The conical surface of the degree of lip-rounding-water guide conical surface, first guide valve seat positioned at the downside of the above-mentioned water guide conical surface and be equipped with opening up annular
The auxiliary valve of groove-condense hydroecium, between the steam through flow hole among auxiliary valve condensation hydroecium and guide's valve seat, have from auxiliary valve condensed water
Water-resisting wall that indoor up extends, circular ring shape is separated by, and the upper end outer diameter of water-resisting wall is less than the internal diameter of water guide conical surface lower end, because
And have certain through-flow gap between the upper end of water-resisting wall and the lower end of the water guide conical surface, from the intermediate exhaust passage of auxiliary valve valve deck
The condensed water that flows down of hole wall can be flowed into downwards in auxiliary valve condensed water room along the surface of the water guide conical surface.
Sealing at valve body and valve seat mounting surface uses Multiple Combination sealing structure, the Multiple Combination sealing structure packet
Metal o-ring containing circular ring shape and spirotallic gasket；The section of the metal o-ring is structure symmetrical above and below, metal sealing
Circle is pressure seal section by inner radius, and the pressure seal section includes the circle by being cut out outward in the middle part of metal o-ring internal diameter
The pressure-bearing cavity portion of annular, metal o-ring upper and lower surface is between the annular surface and pressure-bearing cavity upper and lower surface of internal side diameter
Elastic packing tongue that entity is constituted, metal o-ring upper and lower surface are located at the ring on the outside of elastic packing tongue and being inwardly recessed
The thinned recessed portion of shape；Upper and lower surface in the side of the close outer diameter of metal o-ring is provided with the rank for the annular being inwardly recessed
Terraced plane is simultaneously placed with spirotallic gasket in the recessed ladder plane；It is located at spirotallic gasket and by internal diameter in metal o-ring
Upper and lower surface between the pressure seal section of side is additionally provided with tooth form seal section, and the tooth form seal section is in metal sealing
The gold that the wide narrow concentric circles anchor ring that the upper and lower surface of circle leaves after carving the groove equidistantly arranged except several is formed
Belong to sealing tooth；The upper-lower seal surface that the elastic packing tongue of pressure seal section is contacted with valve body, valve seat is in not before assembly
When pressured state, the sealing surfaces are slightly above the surface for the metal sealing tooth being thinned on the outside of recessed portion.
Sealing between auxiliary valve body and auxiliary valve valve deck on the upside of it uses compound gasket structure, the compound gasket knot
Structure is made of tooth profile metal pad+wound gasket, two kinds of gasket concentric arrangements, one inside another on the outside, be placed on auxiliary
At the seam allowance plane of valve body upper end.
The upper end of auxiliary valve valve deck is provided with gland, gland is with the inner hole of the outer circle of its lower end and auxiliary valve valve deck upper end
With positioning, fixation is installed with screw on auxiliary valve valve deck；The epimere endoporus of gland constitutes valve rod upper end with the cooperation of valve rod outer circle
Support guide surface；The aperture of the hypomere endoporus of gland is more than the outer diameter of a circle of valve rod, is provided in the hypomere endoporus of gland
The vapor-proof escape structure for preventing steam to be escaped from auxiliary valve valve deck upper end when valve stem seal face is opened, vapor-proof effusion knot
Structure escapes ring by internal resistance and extrernal resistance ease ring is staggered and constitutes, and when internal diameter processing of internal resistance ease ring is slightly smaller than the outer diameter, outer of valve rod
Slightly larger than the internal diameter of the hypomere endoporus of gland, the side of two kinds of resistance ease rings are splitted with wire cutting when the outer diameter processing of resistance ease ring
And certain spring expanding or contraction can be generated.
Position at the medium inlet end of the rear surface of the interior hub of supporting rack, face valve body, be provided with taper, by with
The plane tangent of interior hub circular arc revolution be formed by, downwardly projecting lower spreader；Middle part in the upper surface of thermal valve valve
Be provided with taper, by with the upper transverse plane of thermal valve valve it is tangent circular arc revolution be formed by, the shunting of taper protruding upward
Cone；In addition, the cross sectional shape of hub and the dowel of outer ring is also configured as the oval with low flow resistance characteristic in being connected on supporting rack
Shape.
Electromagnetic relief valve of the present invention, driving device include by electromagnet provide active force driving device, and
The driving device of active force is provided by solenoid valve control pneumatic mechanism.
The beneficial effects of the invention are as follows：1, after the structure described in technical solution using the present invention, it there would not be oxidation
The problem of corrosion product and condensed water enter main valve clack sealing surface nearby and influence valve seal；2, the sealing surface of main valve and auxiliary valve
Position has more sufficient thermal compensation ability, along with the design of rational sealing structure makes valve have more in work condition state
Good sealing reliability；3, the resilient tongue position of main valve clack sealing surface has stronger elastic compensating ability, to be more advantageous to
Ensure that valve can be chronically at zero leakage condition；4, protection of the flexible deformation gap at elastic tongue in set protection structure
Under be not easy to be blocked, thus be more advantageous to ensure valve sealing；5, the condensed water storage knot being arranged on the upside of auxiliary valve sealing surface
Structure solves the problems, such as that the condensed water present in existing product influences auxiliary valve sealing；6, the lumen sealability energy of main valve and auxiliary valve
Access great improvement；Even if dropping significantly if its maintenance cost of external leakage phenomenon occurs in valve lumen under special circumstances
It is low；7, guide sleeve can be fixed reliably；8, the vapor-proof escape structure can effectively protect life of auxiliary valve valve deck upper end setting
Environment is produced, ensures driving device reliably working, ensures that the working performance and reliability of spring and auxiliary valve are unaffected；9, steam is arranged
When putting, flow field is more reasonable, vibration and noise smaller.
Description of the drawings
Fig. 1 is the top row vapour electromagnetic relief valve schematic diagram of the prior art-Crosby company of the U.S..
Fig. 2 is the top row vapour electromagnetic relief valve schematic diagram of the prior art-De Laisai-Kang Suo Reeds company of the U.S..
Fig. 3 is that the main valve clack sealing surface outside of electromagnetic relief valve shown in Fig. 2 increases the schematic diagram of thermal compensation slot.
Fig. 4 is the product structure schematic diagram of the embodiment of the present invention one.
Fig. 5 is the product structure schematic diagram of the embodiment of the present invention two.
Fig. 6 is the left-hand sectional view of the primary valve part of embodiment two shown in fig. 5.
Fig. 7 is the structural schematic diagram of the flap component of the embodiment of the present invention.
Fig. 8 is the close-up schematic view at flap component sealing surface position.
Fig. 9 is the structural schematic diagram of the pressure rack of the embodiment of the present invention.
Figure 10 is the schematic diagram of the steam exhaust structure body of embodiment two and the condensed water container structure of valve seat location.
Figure 11 is the signal of the condensed water container structure and guide's sealing structure of the auxiliary valve bonnet lower of the embodiment of the present invention
Figure.
Figure 12 is that the valve body of main valve of Crosby Products uses the signal of V-type metal o-ring sealing with valve seat location
Figure.
Figure 13 is that the valve body of main valve of De Laisai-Kang Suo Reed products is sealed with valve seat location using c-type metal o-ring
Schematic diagram.
Figure 14 be the valve body of main valve of the embodiment of the present invention, valve seat location Multiple Combination sealing structure schematic diagram.
Figure 15 be the auxiliary valve body of the embodiment of the present invention, valve deck position compound gasket structure schematic diagram.
Figure 16 is the structural schematic diagram of the auxiliary valve valve deck upper end of the embodiment of the present invention.
Figure 17 is the structural schematic diagram of the supporting rack of the embodiment of the present invention.
In figure, 1, valve body；2, supporting rack；2-1, outer ring；2-2, interior hub；2-3, dowel；2-4, lower spreader；3, main valve
Spring；4, guide sleeve；5, flap component；5-1, thermal valve valve；5-2, valve clack sealing surface；5-3, elastic groove；5-4, outer flap；5-5、
Aperture；5-6, straight pin；5-7, damping slot；5-8, into pressure passageway；5-9, spreader；5-10, anti-sticking safe edge；6, pressure rack；6-1、
Through-flow window；7, Multiple Combination sealing structure；7-1, metal o-ring；7-1-1, pressure-bearing cavity portion；7-1-2, elastic packing tongue
Portion；7-1-3, recessed portion is thinned；7-1-4, metal sealing tooth；7-2, spirotallic gasket；8, valve seat；9, wave mode circle；10, gasket；11、
Steam exhaust structure body；11-1, main valve condense hydroecium；12, connecting tube；13, auxiliary valve body；14, valve rod；14-1, valve stem seal face；
14-2, thermal compensation slot；15, guide's valve seat；15-1, water-resisting wall；15-2, auxiliary valve condense hydroecium；16, auxiliary valve valve deck；16-1, water guide
The conical surface；17, divided ring；18, compound gasket structure；18-1, metal flute profile pad；18-2, wound gasket；19, lower flange；20, upper method
It is blue；21, gland steam exhauster；22, gland；23, auxiliary valve spring；24, support plate；25, column；26, fastening screw nut；27, adjusting cap；28、
Push rod；29, driving device；30, internal resistance ease ring；31, extrernal resistance ease ring；32, V-type metal o-ring；33, c-type metal o-ring.
Specific implementation mode
Technical scheme of the present invention is further elaborated with two embodiments below in conjunction with the accompanying drawings.
Embodiment one
It is the product structure schematic diagram of the electromagnetic relief valve of the present embodiment as shown in Figure 4.
The structure that the electromagnetic relief valve is main valve, auxiliary valve is split type, auxiliary valve are arranged in the side of main valve, and the two passes through connection
Pipe (12) is connected with necessary fixedly connected part, and the exhaust steam end of valve is located on the upside of main valve, is set to valve body of main valve (1) upper end
Steam exhaust structure body (11) is the connecting flange with upper and lower flange end, and lower end flanges connect phase with valve body (1) upper end by bolt
Valve seat (8) is connected simultaneously and compresses, upper flanges when installing with the gland steam exhauster of side disposed thereon for connecting；In valve body (1)
Intracavitary is equipped with the main valve clack for blocking and discharging main steam, and upward, main valve clack is interior because being equipped in the direction of main valve clack sealing surface
Main spool spring (3) thus valve assembly after main valve clack sealing surface can be upwards with valve seat (8) lower end sealing surface be adjacent to.Valve
Guide's sealing structure be arranged in auxiliary valve, auxiliary valve body (13) by divided ring (17), lower flange (19) and upper flange (20) with
Bolt connection structure is connected with auxiliary valve valve deck (16), and gland steam exhauster is provided with outward in the intermediate exhaust passage of auxiliary valve valve deck (16)
(21)；The upper end of auxiliary valve valve deck (16) is equipped with auxiliary valve spring (23), and the upper end top pressure of auxiliary valve spring (23) is being mounted on
At the lower end step plane of the support plate (24) on valve rod (14) top, make the close of guide's sealing structure positioned at valve rod (14) lower end
Envelope pair is in be adjacent to state after assembly and installation；The upper end of valve rod (14) is provided with adjusting cap (27), adjusting cap after valve assembling
(27) with fastening screw nut (26) and tight and fix its position after adjusting axial position；Inside is equipped with the driving dress of electromagnet
(29) are set to be fixed on auxiliary valve with three root posts (25).
Main valve clack uses flap modular construction in the technical program.The operation principle of valve is as follows：Valve is in working condition
When, the lumen of valve body (1) full of main steam (crossing hot vapour), steam by the gap between flap component (5) and guide sleeve (4) into
Enter the inner space of flap component (5), while and entering the inner cavity of auxiliary valve body (13), high steam by connecting tube (12)
Pressure be acting upwardly on flap component (5) valve clack sealing surface (5-2) made to be pressed on the sealing surface of valve seat (8) and make valve
Sealing is kept, while the pressure of high steam is also acting upwardly on valve rod (14) lower end and guide's sealing structure is made to keep sealing.When
The pressure rise of main steam in superheater header and when more than the set-pressure of electromagnetic relief valve, it is logical that pressure switch sends out signal
Crossing control system makes the electromagnet excitation in driving device (29) and acts, and is made on the downside of driving device (29) by transmission mechanism
Push rod (28) quickly moves down and the valve stem seal face (14-1) of valve rod (14) lower end is pushed to open, after auxiliary valve is opened, flap
Intermediate exhaust passage and gland steam exhauster (21) of the steam of component (5) inner space out of auxiliary valve valve deck (16) are discharged rapidly, flap
The upper end of component (5) is interior by the downward active force of steam to the annulus areal extent of flap component (5) outer diameter from sealing surface diameter
And open, then the upper surface of entire flap component (5) is reached fully open position rapidly by the down thrust of pressure medium and arranges
Put steam；Flap component (5) is being opened and when discharge state, although still have steam from flap component (5) and guide sleeve (4) it
Between gap and the space in flap component (5) is flowed into pressure passageway (5-8) by the lower end outer flap (5-4), but due to valve
The through-current capability of the direction will be noticeably greater than the through-current capability of above-mentioned gap location after bar sealing surface (14-1) is opened, and add flap
Several flowings to steam are machined in the outer circle of component (5) with damping slot (5-7) (see Fig. 7) energy of the retardation of appropriateness
It is enough that the steam flow of inflow is suitably limited, thus interior be not likely to form of flap component (5) can allow the back pressure of its time seat,
Therefore, flap component (5) can be stably maintained at fully open position in discharge state to ensure the reliable discharge of superpressure steam simultaneously
Avoid the vibration and abrasion of part.When main steam pressure is reduced to the preset blow pressure of electromagnetic relief valve, control system
System, which sends out signal, makes electromagnet power off, push rod (28) retraction, under the action of auxiliary valve spring (23) spring force, valve stem seal face
(14-1) is closed, gap of the steam between flap component (5) and guide sleeve (4) and by the lower end outer flap (5-4) into pressure
Channel (5-8) is again introduced into the space in flap component (5), since the medium of flap component (5) inner cavity is noncurrent medium,
Its static pressure can be higher than the static pressure of the swiftly flowing medium on the upside of flap component (5), and upper and lower pressure difference adds main valve bullet
The thrust of spring (3) can push flap component (5) to close；After valve is closed, main valve and auxiliary valve will keep close by steam pressure
Envelope.
The structural shape of valve body (1) is revolution build, is welded by upper and lower two parts, the middle part in valve body (1), if
It is equipped with the supporting rack (2) for supporting and fixing the parts such as flap component (5), the outer ring (2-1) of the annular of supporting rack (2) is embedding
It fills and is clamped between upper and lower two parts of valve body (1), the interior hub in middle section-(2-2) and the supporting rack (2) of supporting rack (2)
Circular passage between outer ring (2-1), passes through from bottom to top for medium；It is additionally provided between interior hub (2-2) and outer ring (2-1)
Multiple dowels (2-3) (see Figure 17), make position of the interior hub (2-2) in valve body (1) be supported and be fixed.
In the present embodiment, the structure that attached thermal compensation function and the flap component (5) of elastic compensating function is valve
One of main key problem in technology, technical solution are：Flap component (5) is by thermal valve valve (5-1) and outer flap (5-4) two parts structure
At (Fig. 7), thermal valve valve (5-1) and outer flap (5-4) are revolution build part, and the two is concentric arrangement, thermal valve valve (5-1) exists
Outside, the two is integrated interior and outer flap (5-4) with threaded engagement connection, and is punched, is packed into from the outer circle of outer flap (5-4)
Straight pin (5-6) is locking；The upper surface thermal valve valve (5-1) outer circumferential side is the valve clack sealing surface (5-2) of circular ring shape, and sealing surface is plane
Seal style (see Fig. 8), thermal valve valve (5-1) is the back side of valve clack sealing surface (5-2) is provided with the conical surface, the semi-cone angle of the conical surface is
55 °, while the adjacent position on outer flap (5-4) on the outside of the above-mentioned conical surface is also provided with the conical surface of identical taper, when
When flap component (5) is in the free state for being not loaded into valve, there are small gap, this implementations between the above-mentioned two adjacent conical surface
The gap setting is t=0.06~0.08mm in example, and when flap component (5) assembles on product and bears medium in use
After pressure, two conical surfaces are in contact；It is additionally provided with elastic groove (5-3), the elastic groove at the conical surface of the thermal valve valve (5-1)
(5-3) includes upper and lower step plane and cylindrical surface, with round-corner transition between cylindrical surface and upper and lower step plane.Outer flap
(5-4) is being provided with step surface at valve clack sealing surface (5-2) outer diameter, and the vertical height of the upper surface on the outside of the step surface is high
In the vertical height of valve clack sealing surface (5-2).
As shown in figure 8, the setting of clearance t makes the cone end elasticity tongue at thermal valve valve (5-1) sealing surface position be in sealing surface
There can be appropriate elastic bending deflection when compression, which can effectively improve the sealing performance of valve；This reality
A technical solution is applied relative to the both sides steam discharge for using similar thermal compensation and elastic compensating structure, major-minor valve integral structure
Existing electromagnetic relief valve product the increased elastic groove (5-3) of valve flap structure institute, the sky of high-temperature steam is accommodated in addition to can be used as
Between to make sealing surface position in high the temperature difference for carrying out effective thermal compensation on the inside of the sealing surface of upper end, reducing sealing surface medial and lateral
Deformation when warm operating mode obtains outside control, another effect is that the upper side of elastic groove (5-3) makes thermal valve valve (5-1) seal
Tapering on the downside of face switch to since conical surface stage casing plane, to the tapering from conical surface stage casing proceeded by effectively be thinned, together
When the present embodiment in both sides steam discharge of the thickness than using similar thermal compensation and elastic compensating structure at the elasticity tongue of cone end
Existing electromagnetic relief valve product thermal valve valve cone end elasticity tongue at thickness have appropriate increase, make entire elastic groove (5-3)
Upside can generate effective elastic bending deflection, it is elastic rather than only by cone end elasticity tongue offer elastic compensating
Compensation ability obtains more significant enhancing, and the intensity at sealing surface position is also increased, and has when bearing back seat impact more preferable
Reliability.Be set as with round-corner transition between the cylindrical surface and side plane of elastic groove (5-3), can to avoid stress concentrate and
It cracks or fracture damage.Due to outer flap (5-4) at the outer diameter close to valve clack sealing surface (5-2) i.e. flexible deformation gap
Outside is provided with step surface, and the vertical height of upper surface of the outer flap (5-4) on the outside of the step surface is made to increase and be higher than flap
The vertical height of sealing surface (5-2), the upper surface-anti-sticking safe edge (5-10) on the outside of the step surface are higher by valve clack sealing surface (5-2)
Height a as shown in Figure 8；The existing electromagnetic relief valve of the both sides steam discharge of the thermal compensation and elastic compensating structure similar with using
The main valve clack of product when opening discharge steam, meet because of opening to medium inflow direction by the flexible deformation gap in open configuration
And be easy to make the small impurity particle in medium be caught in cause in flexible deformation gap the sealing condition of main valve clack sealing surface by
Unlike influencing, the present embodiment technical solution is provided with the anti-sticking safe edge (5-10) that height is higher than valve clack sealing surface (5-2), makes
Flexible deformation gap on the downside of valve clack sealing surface (5-2) is hidden into the step surface on the outside of flexible deformation gap, is not straight
It connects in the discharge-channel for being exposed to medium, thus is difficult to be discharged the small impurity particle that may be mingled in medium and blocks, make
The sealing reliability of valve is enhanced.
In the technical solution of the present embodiment, also at the upper end outer circle of the outer flap (5-4) of flap component (5) and thermal valve
The corresponding height of elastic groove (5-3) on valve (5-1) is drilled with the aperture (5-5) (referring to Fig. 7) of multiple uniformly distributed perforations.
Elastic groove (5-3) on thermal valve valve (5-1), which can be used as, accommodates the space of high-temperature steam on the inside of the sealing surface of upper end
Effective thermal compensation is carried out, when valve is closed, due to being located at the thermal valve valve (5- on the downside of valve clack sealing surface (5-2)
1) the flexible deformation gap between outer flap (5-4) is in closed state because of compression, and high-temperature steam can be difficult to enter at this time
The space in elastic groove (5-3) cannot even be entered completely, prevent the thermal compensation function of flap component (5) from being played.This
In the technical solution of embodiment, at elastic groove (5-3) on the outside of outside flap (5-4) increased perforation aperture (5-5) just
It can solve the problems, such as this, high-temperature steam can swimmingly enter in elastic groove (5-3), make flap component (5) sealing surface position
Thermal compensation function normally played, to make valve that can maintain preferable sealing performance for a long time under worst hot case.
Another key structure in the present embodiment technical solution is installation and the fixed structure of guide sleeve (4).Positioned at valve
The outside of valve component (5), for flap component (5) guide-localization tubular guide sleeve (4), propped up with the orifice end of its lower end
The circular cylindrical projection stop portion installation positioning (see Fig. 4) of support (2) upper end, the outer circle of guide sleeve (4) are equipped with the Step-edge Junction of annular
The upper side of structure, step structure is annular plane；It is clamped in valve body (1) and row in the outside of valve seat (8), from valve seat (8)
On the inside of the lower plane of boss between vapour structure (11) lower flange down, it is additionally provided with pressure rack (6), pressure rack (6) is revolution build
And the through-flow window of window-(6-1) of multiple uniformly distributed perforations is machined in outer circle, for medium by being flowed into inside outside (see Fig. 9),
The upper and lower end face of pressure rack (6) is located at the boss lower plane on the outside of valve seat (8) and the circular ring shape platform in guide sleeve (4) outer circle
On rank between plane.In addition, between the boss lower plane on the outside of the upper surface of pressure rack (6) and valve seat (8), and there are one installations
The wave mode circle (9) of elasticity tension can be generated after compression.
Guide sleeve (4) is placed on supporting rack (2) upper end when valve assembles and is packed into pressure rack (6), valve seat (8) on its upper side
After being loaded into and clamping between valve body (1) and steam exhaust structure body (11) lower flange, the installation of pressure rack (6) and guide sleeve (4)
Position is just completely fixed.When valve steam discharge, steam enters from valve body (1) lower end in valve, passes through the interior hub (2- of supporting rack (2)
2) channel between outer ring (2-1) is upward, and the upper of flap component (5) is entered at the through-flow window (6-1) in pressure rack (6)
Side is simultaneously discharged by the access opening of valve seat (8).
It needs fully to compress the boss lower plane on the outside of valve seat (8) by middle flange bolt after assembling due to valve seat (8)
With the associated seal of the Multiple Combination sealing structure (7) at the concave mouth of valve body (1) upper end, to ensure the upper hold-carrying of valve body (1)
External leakage will not occur for blue place, will not be held out against between the upper surface and valve seat (8) of pressure rack (6) when therefore, it is necessary to ensure assembly.For
Increase vibration and noise when preventing due to pressure rack (6), guide sleeve (4) are not compacted in an axial direction in steam discharge, in the upper of pressure rack (6)
It is provided with wave mode circle (9) between end face and valve seat (8), pressure rack is made by the elastic force of wave mode circle (9) when valve seat (8) compresses
(6) it is also moderately compressed simultaneously with guide sleeve (4).
After guide sleeve uses the above-mentioned installation fixed structure directly assembled, used with existing product to be interference fitted indentation
Mode compare, the fixation of guide sleeve is more reliable, and assembly is more convenient, quick, and repair is also easier to, while the processing request of part
Also it decreases.
In the technical solution of the present embodiment, in the lower end of auxiliary valve valve deck (16), it is provided with guide's valve seat (15) (see Figure 11),
Guide's valve seat (15) is connected and sealed with auxiliary valve valve deck (16) by screw thread and sealing welding, and the weld seam of sealing welding is located on screw thread
With at the outer circle on guide's valve seat (15) joint surface, guide's sealing surface that switching motion is executed on auxiliary valve is straight for end, auxiliary valve valve deck (16)
The lower part for being arranged on valve rod (14), being located at valve rod (14) is connect, is provided with and the valve of valve rod (14) lower part on guide's valve seat (15)
The sealing surface of bar sealing surface (14-1) pairing；Valve stem seal face (14-1) is spherical surface, and the sealing surface on guide's valve seat (15) is then
It dehisces the downward conical surface in direction, is coincide with tangent state both when closing, the sealing surface of guide's valve seat (15) in the present embodiment
Cone angle is set as 60 °, and the sealing surface of valve stem seal face (14-1) and guide's valve seat (15) is by built-up welding and the processing of heap postwelding
It is formed, the high rigidity cobalt-base alloys of equal built-up welding HRC >=50 of two sealing surfaces；The back side of valve stem seal face (14-1) is provided with annular
Groove-thermal compensation slot (14-2)；From the outer diameter of valve stem seal face (14-1) toward having one section of cylindrical section, the cylindrical section again
The increase of downward then outer diameter constitutes another section of cylindrical surface being oriented to for the bearing of valve rod (14) lower end, the sealing of first guide valve seat (15)
The past cylindrical hole being arranged with and the above-mentioned cylindrical surface being oriented to for the bearing of valve rod (14) lower end coordinates in face；From guide's valve seat
(15) toroidal cavity between the cylindrical section of the upside and valve stem seal face (14-1) outer diameter of above-mentioned cylindrical hole down is outside, bores
There are uniformly distributed several through flow holes, uniformly distributed several through flow holes are also drilled with toward above-mentioned toroidal cavity in valve rod (14) lower face.
The structure of the split of valve rod and guide's flap relative to existing product, the technical program use above-mentioned valve rod
With the overall structure of guide's sealing surface can overcome because the size of connection structure is smaller, guide's flap be fragile material, structure compared with
Caused by complexity the problem of poor reliability；Valve stem seal face is formed by the way of built-up welding cobalt base hard alloy, can be made whole
Body structure makes guide's sealing structure have higher use reliability, sealing surface while keeping preferable comprehensive mechanical performance
The high rigidity cobalt base hard alloy of built-up welding HRC >=50 enables to obtain preferable resistance to compression, against corrosion, scour resistance at sealing surface,
To make guide's sealing surface obtain more preferable, more longlasting sealing performance.The sealing surface of guide's valve seat (15) is designed as the conical surface, favorably
In sealing surface diameter it is smaller, it is axial fasten power it is also smaller in the state of by cone structure sealing surface is made to the amplification of power
Obtain enough seal pressures；The cone angle of usual conical surface seal is sealed by 60 °~70 ° designs, the present embodiment in order to improve guide
Sealability at face processes sealing surface by 60 ° of relatively Small Tapers；Sealing pair uses the structure of spherical surface-conical surface, can make sealing
Pair obtains state of more preferably coincideing, for the sealing structure of the flat seal of existing product or the conical surface-conical surface more
Contribute to the sealing performance of improvement product.
The thermal compensation slot (14-2) of valve stem seal face (14-1) back side, by increasing valve stem seal face (14-1) back surface
At a distance from the area and reduction high-temperature medium and uper side surface of high-temperature medium contact, more heats can be allowed to be communicated up,
The temperature difference in the interior outside at sealing surface position is set to be substantially reduced, so as to make the uneven heat of valve stem seal face (14-1) at high temperature
Deformation is controlled better and then the sealing reliability of auxiliary valve guide sealing position and sealing life is made to be enhanced.
The structure setting of the technical program makes the lower end of valve rod (14) obtain reliable bearing positioning；It seals and ties in guide
The side through flow hole and lower through flow hole that the lower part of structure is arranged simultaneously, the mode phase of trepanning only at guide frame with existing product
Than secondary valve flow area required when opening discharge steam is guaranteed, to ensure that the Valve opening velocity of valve can be more preferable
Ground meets the needs of unit safety protection.
It is logical in the intermediate steam discharge of the auxiliary valve valve deck (16) on the upside of pilot valve seat (15) in the technical solution of the present embodiment
The lower end in road is equipped with the conical surface-water guide conical surface (16-1) (Figure 11) of the increased toroidal of diameter down, the water guide conical surface (16-1)
For the smaller conical surface of angle of taper, its semi-cone angle is by 7.5 ° of processing in the present embodiment；First guide valve seat (15) is located at above-mentioned lead
The downside in water cone face (16-1) simultaneously condenses hydroecium (15-2) equipped with the opening up auxiliary valve of annular groove-, and auxiliary valve condenses hydroecium
Between the intermediate steam through flow hole of (15-2) and guide's valve seat (15), has and up extend on the inside of auxiliary valve condensation hydroecium (15-2)
, the water-resisting wall (15-1) of circular ring shape be separated by, the upper end outer diameter of water-resisting wall (15-1) is less than the interior of the lower end the water guide conical surface (16-1)
Diameter, thus have certain through-flow gap between the upper end of water-resisting wall (15-1) and the lower end of the water guide conical surface (16-1), from auxiliary valve
The condensed water that the hole wall of the intermediate exhaust passage of valve deck (16) flows down can flow into downwards along the surface of the water guide conical surface (16-1)
In auxiliary valve condensation hydroecium (15-2).
After discharge of steam, the steam being deposited in blow-off line and the intermediate exhaust passage of auxiliary valve valve deck (16) can be condensed gradually
Condensed water is formed, condensed water can cause the inhomogeneous deformation of sealing surface and cause to leak after flowing back to guide's sealing surface position.This
Embodiment condensed water container structure set in the lower end of auxiliary valve valve deck (16) and guide's valve seat (15) may insure to condense
Water will not flow at guide's sealing surface：In the condensed water formed in the intermediate exhaust passage of auxiliary valve valve deck (16) and gland steam exhauster (21),
This partial coagulation water flowed down along the hole wall of the intermediate exhaust passage of auxiliary valve valve deck (16) can be along the surface of the water guide conical surface (16-1)
It fully flows into downwards in auxiliary valve condensation hydroecium (15-2), since the bottom end of auxiliary valve condensation hydroecium (15-2) is at a distance from sealing surface
Relatively close, temperature is higher, thus the condensed water for flowing into auxiliary valve condensation hydroecium (15-2) can rapidly or gradually gasify again；In addition a small amount of
Suitable valve rod (14) surface decline condensed water, since the temperature of valve rod (14) hypomere is higher, thus decline condensed water midway
It can gradually gasify and can not possibly reach at the sealing surface of valve rod (14) lower end.Therefore, by above-mentioned condensed water container structure energy
Enough condensed waters reliably solved the problems, such as present in existing electromagnetic relief valve product influence the sealing of guide's sealing surface.Water guide cone
Why face (16-1) is set as the smaller conical surface of angle of taper, is to consider to ensure that condensed water can flow downward and energy along the conical surface
Enough enter auxiliary valve condensation hydroecium (15-2), is flow at guide's sealing surface without dripping.
In the technical solution of the present embodiment, in valve seat (8) and valve body (1) installation position, i.e. the recessed of valve body (1) upper surface stops
On the outside of mouth and valve seat (8) at the lower plane of boss, it is sealed (see Figure 14 and Fig. 4) using Multiple Combination sealing structure (7), institute
The Multiple Combination sealing structure (7) stated includes the metal o-ring (7-1) and spirotallic gasket (7-2) of circular ring shape.The metal
The section of sealing ring (7-1) is structure symmetrical above and below, and the inner radius of leaning on of metal o-ring (7-1) is pressure seal section, described
Pressure seal section includes pressure-bearing cavity portion (7-1-1), elastic packing tongue (7-1-2) and thinned recessed portion (7-1-3)：Pressure-bearing is empty
Cavity portion (7-1-1) is the level trough of the circular ring shape cut out in outward direction in the middle part of the internal diameter by metal o-ring (7-1), circular ring shape
The top of slot is arc-shaped to reduce the stress concentration of slot root, improve reliability；Metal o-ring (7-1) upper and lower surface is close
Entity between the annular surface and pressure-bearing cavity upper and lower surface of internal side diameter constitutes elastic packing tongue (7-1-2)；Metal o-ring
The upper and lower surface (7-1) is located at the annular section on the outside of elastic packing tongue and being inwardly recessed and constitutes thinned recessed portion (7-1-3).
The upper and lower surface of the side of the close outer diameter of metal o-ring (7-1) is provided with the ladder plane for the annular being inwardly recessed, and
It is placed with spirotallic gasket (7-2) in the recessed ladder plane.It is located at spirotallic gasket (7-2) in metal o-ring (7-1)
And the upper and lower surface between the pressure seal section of internal diameter side, it is additionally provided with tooth form seal section, the tooth form seal section is
It is left after carving the groove equidistantly arranged except several in the upper and lower surface of metal o-ring (7-1) wide narrow concentric
The metal sealing tooth (7-1-4) that anchor ring is formed.The elastic packing tongue (7-1-2) of pressure seal section and valve body (1), valve seat
(8) the upper-lower seal surface contacted, when being in non-pressured state before assembly, recessed portion is slightly above thinned in the sealing surfaces
The surface of metal sealing tooth (7-1-4) on the outside of (7-1-3), the in the present embodiment upper following table of elastic packing tongue (7-1-2)
Face is 0.15mm higher than the height on the surface metal sealing tooth (7-1-4).
After valve assembly, the elastic packing tongue (7-1-2) of metal o-ring (7-1) because being slightly above medial plane, thus
Certain elastic bending can be generated after compression and with it is convex on the outside of the concave mouth sealing plane of valve body (1) upper surface and valve seat (8)
The lower end sealing plane of platform is adjacent to, and forms initial sealing than pressure；When valve is in running order, it is located at pressure-bearing cavity portion (7-
1-1) the high-pressure medium promotion elastic packing tongue (7-1-2) at place is more closely affixed to valve body (1) and the sealing of valve seat (8) is flat
Face generates preferable sealing effect；The purpose that recessed portion (7-1-3) is thinned is set, is to enhance elastic packing tongue (7-1-
2) elastic bending ability.In order to enhance sealing performance and sealing reliability, in addition also set up except above-mentioned pressure seal section
Tooth profile metal seal section and wound gasket seal section form multi-sealing structure；The surface groove at the position metal sealing tooth (7-1-4)
Effect be reduce contact area, improve seal pressure to improve sealability；Spirotallic gasket (7- set by outermost
2) wound gasket seal section, the outermost auxiliary sealing structure as Multiple Combination sealing structure are constituted.
Compared with the structure that existing product is sealed using V-type metal o-ring or c-type metal o-ring, Multiple Combination is used instead
Sealing structure (7) makes the sealing performance of valve seat (8) and valve body (1) installation position and sealing reliability greatly improve；Spirotallic gasket
With the buying of metal o-ring or manufacturing cost that are formed by machining well below V-type or c-type metal o-ring
Import price, along with sealing reliability can improve a lot after Multiple Combination sealing structure using the present invention, thus valve
The maintenance cost of door can also substantially reduce.
Sealing structure at auxiliary valve body, valve deck：As shown in Figure 15 and Fig. 4, auxiliary valve body (13) and the auxiliary valve on the upside of it
Sealing between valve deck (16) uses compound gasket structure (18), and the compound gasket structure (18) is by tooth profile metal pad (18-
1)+wound gasket (18-2) forms, and two kinds of gasket concentric arrangements, tooth profile metal pad (18-1) exists in inside, wound gasket (18-2)
Outside is placed at the seam allowance plane of auxiliary valve body (13) upper end.
Since the diameter of auxiliary valve body, valve bonnet seal position is relatively small, and in work condition state the position temperature
Can be less than valve body of main valve, the temperature at valve base sealing position, thus technical scheme of the present invention is at auxiliary valve body, valve bonnet seal position
Use above-mentioned relatively simple combination sealing gasket construction.Existing product is wound using V-type metal o-ring or soft graphite
Pad as auxiliary valve body, the sealing element at valve bonnet seal position, V-type metal o-ring due to valve body and valve bonnet seal surface
Contact area is small (essentially line contact condition), valve body when high temperature, valve bonnet seal surface hardness decline, connect with metal o-ring
So that specific contact pressure is declined because generating plastic deformation at contacting surface, sealing reliability can be caused to reduce；And wound gasket be used alone in
Its sealing reliability can not generally be met the requirements when high temperature and high pressure condition.Said combination gasket construction uses flute profile pad and twines
Around pad side by side use formed dual-seal, sealability and sealing reliability had compared with the sealing structure of existing product it is larger
Improve.
The structure of valve deck and valve rod top：The upper end of auxiliary valve valve deck (16) is provided with gland (22) (see Figure 16), gland
(22) pacified on auxiliary valve valve deck (16) with the inner hole of auxiliary valve valve deck (16) upper end and positioning, with screw with the outer circle of its lower end
Dress is fixed；The epimere endoporus of gland (22) constitutes the bearing guide surface of valve rod (14) upper end with the cooperation of valve rod (14) outer circle.Gland
(22) aperture of hypomere endoporus is more than valve rod (14) outer diameter of a circle, is provided in valve rod in the hypomere endoporus of gland (22)
The vapor-proof escape structure for preventing steam to be escaped from auxiliary valve valve deck (16) upper end when sealing surface (14-1) is opened, the vapor-proof
Escape structure is staggered and is constituted by internal resistance ease ring (30) and extrernal resistance ease ring (31), in the present embodiment, is provided with three resistance ease rings,
Configuration mode uses：The combination of internal resistance ease ring+extrernal resistance ease ring+internal resistance ease ring；It is omited when the internal diameter processing of internal resistance ease ring (30)
Small outer diameter in valve rod (14), extrernal resistance escape ring (31) outer diameter processing when the slightly larger than hypomere endoporus of gland (22) it is interior
It is splitted with wire cutting and certain spring expanding or contraction can be generated in the side of diameter, two kinds of resistance ease rings；When Product Assembly, phase
The cutting seam of adjacent two resistances ease ring, which is staggered 120 °, to be packed into.
The lower end of valve rod (14) is oriented to circular hole bearing with the bearing being arranged on the downside of guide's valve seat (15) conical seal (contact) face and determines
Position, upper end are then supported and are positioned with the epimere endoporus of gland (22).Vapor-proof escape structure is by internal resistance ease ring (30) and extrernal resistance
Ease ring (31) is come when preventing discharge of steam and auxiliary valve is just in case steam is from auxiliary valve valve deck (16) and valve rod (14) when leaking
It is escaped at the mating surface at end, the hypomere endoporus of internal resistance is escaped between ring (30) and valve rod (14), extrernal resistance is escaped ring (31) and gland (22)
Between be interference fit very close to each other, steam can be prevented to flow upwards out；Two kinds of resistance ease rings because side by with wire cutting
It splits, certain spring expanding or contraction can be generated, the keying of valve rod (14) is influenced due to without causing stuck.With it is existing
The structure of product is compared, and the present embodiment increases above-mentioned vapor-proof escape structure in the valve deck upper end of auxiliary valve, can effectively hinder
Only steam escapes, and the influence that may be brought to production environment is mitigated or eliminated, and increase driving device (29) and auxiliary valve spring
(23) functional reliability.
Flow field when in order to make discharge of steam in valve is more reasonable, the interior hub (2-2) of supporting rack (2) rear surface,
The position at the medium inlet end of face valve body (1), be provided with taper, by the plane tangent with interior hub (2-2) circular arc turn round
It is formed by, downwardly projecting lower spreader (2-4) (see Figure 17 and Fig. 4)；It is also set at the middle part of the upper surface of thermal valve valve (5-1)
Be equipped with taper, by with the upper transverse plane of thermal valve valve (5-1) it is tangent circular arc revolution be formed by, taper protruding upward point
Flow cone (5-9) (Fig. 7)；In addition, connecting the section shape of interior hub (2-2) and the dowel (2-3) of outer ring (2-1) on supporting rack (2)
Shape is also configured as the kidney ellipsoid with low flow resistance characteristic.
At shunting when the upside in the access road hole of valve body (1), the lower end of supporting rack (2) they are steam flowings, flap group
The upper end of part (5) is that steam liquidates mixing and the position that turns upwards towards radially inward, and the dowel (2-3) of supporting rack (2) is attached
Close is also the more complex position of steam flow field, and steam at high discharge will produce more serious vortex, meeting when flowing through these positions
Vibration and noise caused by discharge of steam is set to enhance.The above-mentioned increased flow dividing structure of technical solution institute or fairing ace,
Swiftly flowing steam can be guided, vortex intensity when discharge of steam can be obviously reduced, when reducing discharge of steam
Vibration and noise.
Embodiment two
It is the product structure schematic diagram of the electromagnetic relief valve of the present embodiment as shown in Figure 5 and Figure 6.What the present embodiment was addressed
Electromagnetic relief valve split type, top bilateral steam discharge electromagnetic relief valve for the auxiliary valve of main valve.The driving device that auxiliary valve top is configured
(29), the driving device that active force is provided by electromagnet may be used, can also use and be provided by solenoid valve control pneumatic mechanism
The driving device of active force；When valve steam discharge, driving device (29) is acted by push rod (28) driving stem (14) on the downside of it
And make valve opening.
The valve mechanism technical solution of the electromagnetic relief valve of the present embodiment, the only tool of the steam exhaust structure body (11) of main valve upper end
Body implements structure and steam exhaust structure body (11) lower end and the implementation structure of valve seat (8) junction has larger difference with embodiment one
Different, remaining each position is in terms of structure or structural principle and no significant difference in addition to this, therefore the present embodiment only has to aforementioned
The concrete structure of larger difference makees related discussion, remaining structure same or similar with embodiment one is then only made summary or do not applied
It states.
In the upside of valve body (1) and valve seat (8), it is provided with steam exhaust structure body (11), the centre of steam exhaust structure body (11) is hung down
Straight channel lower part is connected with bolting connection structure with valve body (1) upper end by the connecting flange of lower end, while steam exhaust structure body
(11) and with the step plane at its lower face plane on the boss on the outside of valve seat (8), the centre of steam exhaust structure body (11) are compressed
Vertical channel shunts to form triplet type structure toward arranged on left and right sides direction upwards, and left and right horizontal channel is arranged in both ends end symmetric
There is connecting flange, the connection of the steam discharge elbow of when for installing and both sides；Steam exhaust structure body (11) left and right horizontal channel is at both ends
With the taper being gradually reduced to interior diameter near aperture.Steam exhaust structure body (11) is processed using stainless cast steel part, among it
Vertical channel is smoothly transitted using the arced flow path being increasingly turned to the turning point of both sides horizontal channel and on the top at shunting position
Hold the shunting cambered surface of self-assembling formation taper.
The present embodiment is simultaneously equipped with condensed water container structure (see Figure 10), institute between steam exhaust structure body (11) and valve seat (8)
The condensed water container structure stated is to be provided with annular cavity-main valve between steam exhaust structure body (11) lower end and valve seat (8) to coagulate
Room (11-1) is born water, the main valve condenses hydroecium (11-1) by plane on boss on the outside of valve seat (8) and the valve seat (8) on the upside of it
The stepped hole that outer circle is processed with steam exhaust structure body (11) intermediate vertical channel lower end is surrounded；It hangs down among steam exhaust structure body (11)
Straight channel lower end is located at the aperture on the upside of valve seat (8) at adjacent regions and is more than valve seat (8) intermediate channel hole upper end toroidal hole
Aperture at mouthful；At the outer circle of valve seat (8) upper end between the lumen orifice of steam exhaust structure body (11) intermediate vertical channel lower end, and there are
The gap of annular makes main valve condense hydroecium (11-1) and is connected with the inner cavity of steam exhaust structure body (11)；In addition, in valve seat (8) quilt
On the boss that steam exhaust structure body (11) compresses at plane, and it is provided with gasket (10).
When valve steam discharge, driving device drives guide's sealing structure in auxiliary valve to act, by the connection of the major-minor valve of connection
Pipe (12) makes the flap component (5) in main valve lose back pressure, flap component (5) to open downwards under the action of pressure medium on its upper side
Open discharge steam.The steam of discharge is upward through valve seat (8) intermediate channel hole and steam exhaust structure body (11) intermediate vertical channel, is arranging
Vapour structure (11) top turns to left and right horizontal direction, is discharged by the steam discharge elbow that both ends connect.On steam exhaust structure body (11)
Portion's turning point using the arced flow path being increasingly turned to and shunting position top tape due to having nature due to using arced flow path
The tapered shunting cambered surface of formation, enables steam olderly flowage, and steam can be avoided to generate stronger vortex at shunting position
And vibration and noise when steam discharge is made to enhance.When valve is restored to closed state, the steam discharge after discharge of steam from muffler down
After the gradual condensation of a large amount of steam retained in pipeline in addition to a part can connect disk by gland steam exhauster condensate and enter drain water piping, by
In steam exhaust structure body (11) vapor discharge channel from existing product used by upwards in line mode be improved to be folded to a left side
Right horizontal direction and in such a way that steam discharge elbow discharges upwards, and the horizontal channel both ends of steam exhaust structure body (11) carry aperture
The lower part of the small taper of mouth while steam discharge elbow can carry drain nozzle in big, thus connect disk toward lower portion institute from gland steam exhauster condensate
The condensed water of generation will not enter at the intermediate vertical channel of steam exhaust structure body (11)；In addition, steam exhaust structure body (11) lumen
Generated a small amount of condensed water, can along steam exhaust structure body (11) intermediate vertical channel inner wall by valve seat (8) upper end outside
Circle annular gap of the place steam exhaust structure body (11) between and enter main valve condensation hydroecium (11-1), due to main valve condensation hydroecium
The surface of the valve seat (8) of (11-1) inner wall is influenced temperature by the heat transfer of lower part high-temperature steam can be higher, thus it is solidifying to enter main valve
Bearing water the condensed water in room (11-1) again can gradually vaporize and in disperse to steam exhaust structure body (11) and gland steam exhauster cavity；Valve seat
(8) endoporus can't form condensed water because of temperature higher (being higher than 100 DEG C) thus on its surface.
When flap component (5) is closed, when thering is oxidation corrosion product and impurity to flow down with condensed water, same meeting
Enter drain water piping from the osculum of steam discharge elbow lower end with condensed water or be trapped in steam discharge elbow, if there is a small amount of oxidation
It, also can be with condensed water along steam exhaust structure body (11) intermediate vertical channel when corrosion product etc. is interior into steam exhaust structure body (11)
Inner wall is flowed into and is accumulated in main valve condensation hydroecium (11-1), without flowing to and being trapped near main valve sealing surface；In this base
On plinth, since steam exhaust structure body (11) is processed using stainless cast steel part, thus also no longer there is oxidation corrosion product and fall to master
Problem near valve sealing surface.Therefore, technical scheme of the present invention eliminates existing top row vapour electromagnetic relief valve product and is easy out
The problem of existing oxidation corrosion product and impurity bring influence to valve seal.
The content that this specification is not described in detail belongs to the prior art well known to professional and technical personnel in the field.
Technical scheme of the present invention is illustrated above in association with drawings and examples, but these attached drawings and explanation are not
It makes sense to limit the scope of the present invention.Those skilled in the art should know that the present invention is not by above-mentioned implementation
The limitation of example and attached drawing, protection domain is defined by appended claims, any without departing from the claims in the present invention
Book define in the range of various changes, modification be formed by technical solution, all spirit and technology without departing from the present invention
Essence, still can belong within scope of the presently claimed invention.
Claims (1)
1. a kind of power station main steam system top steam discharge electromagnetic relief valve, the electromagnetic relief valve are the split type knot of major-minor valve
Structure, auxiliary valve are installed on main valve side, and the exhaust steam end of valve is located at the top of main valve, and the upper end of valve body of main valve (1) is provided with row
The downside of vapour structure (11), steam exhaust structure body (11) is connected with valve body (1) upper end with flange while and compressing valve seat (8)；
Valve body (1) is revolution three-dimensional-structure, is welded by upper and lower two parts, and supporting rack (2), support are equipped at the middle part of valve body (1)
The outer ring (2-1) of the annular of frame (2) is embedding to be sandwiched between upper and lower two parts of valve body (1), the interior hub in middle section-of supporting rack (2)
Circular passage between (2-2) and outer ring (2-1), passes through from bottom to top for medium, interior hub (2-2) and outer ring (2-1) it
Between be equipped with multiple dowels (2-3), so that position of the interior hub (2-2) in valve body (1) is supported and is fixed；Valve is filled by driving
It sets and drives auxiliary valve events and the main valve clack in main valve is made to open, it is characterised in that：Main valve clack uses flap modular construction, flap group
Part (5) is made of thermal valve valve (5-1) and outer flap (5-4), and thermal valve valve (5-1) and outer flap (5-4) are revolution build part,
The two be concentric arrangement, thermal valve valve (5-1) inside and outer flap (5-4) outside, the two is simultaneously integrated with threaded engagement connection；Heat
The upper surface flap (5-1) outer circumferential side is the valve clack sealing surface (5-2) of circular ring shape, and thermal valve valve (5-1) is in valve clack sealing surface (5-2)
Back side is provided with the conical surface, while the adjacent position on outer flap (5-4) on the outside of the above-mentioned conical surface is also provided with identical cone
The conical surface of degree, when free state when flap component (5) is in unassembled, there are between small between the above-mentioned two adjacent conical surface
Gap, and then two conical surfaces are in contact when flap component (5) is in work condition state compression；At the conical surface of the thermal valve valve (5-1)
It is additionally provided with elastic groove (5-3), the elastic groove (5-3) includes upper and lower step plane and cylindrical surface, cylindrical surface and upper and lower
With round-corner transition between step plane；Vertical height of the outer flap (5-4) in the upper surface at valve clack sealing surface (5-2) outer diameter
Vertical height of the degree higher than valve clack sealing surface (5-2)；Positioned at the outside of flap component (5), for flap component (5) guide-localization
Tubular guide sleeve (4), lower end installs positioning with cylindrical positioning surface on supporting rack (2), in the outer circle of guide sleeve (4)
Equipped with step surface, the boss lower plane on the outside of valve seat (8) is additionally provided with pressure rack (6) down, and pressure rack (6) is revolution build and outside
The through-flow windows of window-(6-1) of multiple perforations is machined on circle for medium by flowing into inside outside, the upper and lower end face point of pressure rack (6)
On step on boss lower plane and guide sleeve (4) outer circle that Wei Yu be on the outside of valve seat (8) between plane,
Steam exhaust structure body (11) positioned at valve body of main valve (1) upper end carries upper and lower end connecting flange, and upper end connecting flange is for pacifying
It is connected with the gland steam exhauster of side disposed thereon when dress,
Steam exhaust structure body (11) positioned at valve body of main valve (1) upper end is triplet type structure, and in-between vertical channel is upwards toward left and right
Two side directions shunt to form horizontal channel, and left and right horizontal channel is provided with connecting flange in both ends end symmetric, when for installing
It is connected with the steam discharge elbow of both sides；The material of steam exhaust structure body (11) is stainless steel material, and left and right horizontal channel is in both ends band
There is the taper being gradually reduced to interior diameter near aperture or aperture.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410755913.4A CN104455659B (en) | 2014-12-08 | 2014-12-08 | Top steam exhaust electromagnetic pressure relief valve for main steam system of power station |
| CN201810183611.2A CN108343775B (en) | 2014-12-08 | 2014-12-08 | Power station main steam system top steam discharge electromagnetic relief valve |
| CN201810183614.6A CN108223891B (en) | 2014-12-08 | 2014-12-08 | Power station main steam system top steam discharge electromagnetic relief valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410755913.4A CN104455659B (en) | 2014-12-08 | 2014-12-08 | Top steam exhaust electromagnetic pressure relief valve for main steam system of power station |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810183614.6A Division CN108223891B (en) | 2014-12-08 | 2014-12-08 | Power station main steam system top steam discharge electromagnetic relief valve |
| CN201810183611.2A Division CN108343775B (en) | 2014-12-08 | 2014-12-08 | Power station main steam system top steam discharge electromagnetic relief valve |
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| Publication Number | Publication Date |
|---|---|
| CN104455659A CN104455659A (en) | 2015-03-25 |
| CN104455659B true CN104455659B (en) | 2018-09-04 |
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| CN201810183614.6A Active CN108223891B (en) | 2014-12-08 | 2014-12-08 | Power station main steam system top steam discharge electromagnetic relief valve |
| CN201810183611.2A Active CN108343775B (en) | 2014-12-08 | 2014-12-08 | Power station main steam system top steam discharge electromagnetic relief valve |
| CN201410755913.4A Active CN104455659B (en) | 2014-12-08 | 2014-12-08 | Top steam exhaust electromagnetic pressure relief valve for main steam system of power station |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810183614.6A Active CN108223891B (en) | 2014-12-08 | 2014-12-08 | Power station main steam system top steam discharge electromagnetic relief valve |
| CN201810183611.2A Active CN108343775B (en) | 2014-12-08 | 2014-12-08 | Power station main steam system top steam discharge electromagnetic relief valve |
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| US11803199B2 (en) | 2017-10-26 | 2023-10-31 | Aquestia Ltd. | Dual set-point pressure regulating system |
| EP3701177A4 (en) * | 2017-10-26 | 2020-12-16 | Dorot Management Control Valves Ltd. | Dual set-point pressure regulating system |
| CN109822268B (en) * | 2019-03-28 | 2023-05-30 | 南昌大学 | Robot device for intersecting and welding cone and ball |
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| CN112361042B (en) * | 2020-10-30 | 2023-09-12 | 浙江鸿新阀门有限公司 | Intelligent fire control pressure release explosion-proof relief valve |
| CN112361054B (en) * | 2020-11-10 | 2022-07-15 | 江苏大田阀门制造有限公司 | Automatic recirculation low pressure pump protection valve |
| CN113976842B (en) * | 2021-11-03 | 2023-01-31 | 内蒙古展华科技有限公司 | Device for casting inner hole of hollow ingot |
| CN114508388B (en) * | 2021-12-29 | 2023-07-18 | 东方电气集团东方汽轮机有限公司 | Double-exhaust combined steam valve flow guiding structure |
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- 2014-12-08 CN CN201810183614.6A patent/CN108223891B/en active Active
- 2014-12-08 CN CN201810183611.2A patent/CN108343775B/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108343775A (en) | 2018-07-31 |
| CN108223891B (en) | 2019-07-12 |
| CN108223891A (en) | 2018-06-29 |
| CN104455659A (en) | 2015-03-25 |
| CN108343775B (en) | 2019-07-16 |
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Address after: 362100 Dongxia Road 398, Huian County, Quanzhou City, Fujian Province Patentee after: Sun Qiumei Address before: 362100 Po Tang 281, Yutian village, Zhang ban Town, Huian County, Fujian. Patentee before: Sun Qiumei |
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Effective date of registration: 20200612 Address after: 214000 No.6 Zhenyang Road, Yangshi, Luoshe Town, Huishan District, Wuxi City, Jiangsu Province Patentee after: Wuxi Xinming automatic control valve Co.,Ltd. Address before: 362100 Dongxia Road 398, Huian County, Quanzhou City, Fujian Province Patentee before: Sun Qiumei |
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Effective date of registration: 20220509 Address after: 202-1-5320, feifeng Road, Hongshan street, Xinwu District, Wuxi City, Jiangsu Province, 214000 Patentee after: Wuxi Suhui Information Technology Service Co.,Ltd. Address before: 214000 No.6 Zhenyang Road, Yangshi, Luoshe Town, Huishan District, Wuxi City, Jiangsu Province Patentee before: Wuxi Xinming automatic control valve Co.,Ltd. |