CN108223891A - Power station main steam system top steam discharge electromagnetic relief valve - Google Patents

Abstract

The invention discloses a kind of power station main steam system top steam discharge electromagnetic relief valve, the valve is that major-minor valve is split type, top is in line or top bilateral steam discharge；Main valve clack is made of thermal valve valve and outer flap, and thermal compensation, elastic compensating and Anti-clamping structure are provided on main valve clack；Guide sleeve is fixed using assembling structure, by pressure rack；Condensation water container structure is both provided on the upside of main and auxiliary valve sealing surface；Auxiliary valve sealing surface is using spherical surface cone structure and with thermal compensation slot；Combined sealing structure is used at main and auxiliary valve lumen；Auxiliary valve upper end is provided with vapor-proof escape structure；Region of interest is provided with the partial structurtes that can improve flow field characteristic in valve.Major advantage：The problem of no condensation water and oxidation corrosion product influence valve seal, main and auxiliary valve sealing surface compensation ability is strong, sealing reliability is high, and main valve clack elastic gap is not easy blocking, and main and auxiliary valve lumen is without external leakage, guide sleeve fix it is reliable, conveniently, without steam effusion, vibration and noise smaller during discharge.

Description

Power station main steam system top steam discharge electromagnetic relief valve

The application be application No. is：2014107559134th, invention and created name is：Power station main steam system top steam discharge electricity Magnetic relief valve, the applying date be：The divisional application of the application for a patent for invention on December 08th, 2014.

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 pilot-operated type valve that the driving devices such as magnet driving guide's flap releases steam and acts main valve clack.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 during force value, and the pressure of system is down to normal value, as avoids main steam safe as possible Valve events to maintain the Performance And Reliability of safety valve, the use for extending main steam safety valve and maintenance cycle, keep unit 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 that pressure when electromagnetic relief valve is according to unit starting and operation controls, 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) uses main valve clack sealing surface for representative Upward, the product of top row vapour, auxiliary valve split 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 critical valves of more serious problem.Existing main valve clack upward, top row vapour, auxiliary valve split side dress electromagnetism let out The shortcomings that pressure valve product is existing in use and problem have：1st, 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 for top the corrosion products such as steam exhaust structure, oxide skin can fall or be gathered with the flowing of condensed water Near main valve clack sealing surface, so as to be affected to the sealing of valve；2nd, top steam exhaust structure can make main valve clack upper end surface There is condensation water to splash drop or accumulate condensation 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 sealing surface position is made to be deformed even cracking, the use of valve is caused to be affected；3rd, the guide of auxiliary valve is close Similarly there are problems that aforementioned this at cover, can constantly there are the different parts oozed under condensation water to sealing surface after steam discharge, make Sealing surface position generates inhomogeneous deformation due to continuous local cooling, causes electromagnetic relief valve product generally existing in use Auxiliary valve opens rear sealing surface for several times and starts to 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；4th, 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；5th, 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, because of volume, drastically swelling heat absorption can make near sealing face leakage point the medium leaked out Wen Duxiajiang, unbalanced temperature change can cause again sealing surface generate inhomogeneous deformation so as to aggravate to leak；6th, discharge is steamed During vapour or when auxiliary valve has leakage, auxiliary valve upper end has steam effusion, in addition to that can be affected to production environment, and influence 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, so as to influence whether the reliability of the sealing of auxiliary valve and auxiliary valve closing motion, meeting when serious Make to occur leaking greatly or making valve rod that can not close at sealing surface；7th, 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 with valve deck position using V-type metal o-ring (as shown in figure 12, piece number 32 is the V-type metal o-ring), And the product of De Laisai-Kang Suo Reeds (Dresser-Consolidated) company then employs the sealing of c-type metal o-ring (such as Shown in Figure 13, piece number 33 is c-type metal o-ring), then sealed using soft graphite wound gasket at the valve body valve deck of its auxiliary valve.V Type or c-type metal o-ring generate seal pressure, but due to following by itself elasticity tension and pressure self-sealing effect 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 seat compression metal o-ring is screwed, Sealing ring influences to seal with easily generating scratch phenomenon at the contact surface of valve seat or valve body；Second is that because V-type or c-type metal are close Seal and the contact area very little of 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, it is recessed when plastic deformation can be generated because being pressurized in the surface of line contact condition with metal o-ring on valve body, valve seat, 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 There is the problem of external leakage is one more typical；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 greatly increases the product repairing cost of power plant, maintenance cycle lengthens, system up to tens of days Determine the difficulty of maintenance project and uncertain increase, larger impact is brought to the operating maintenance of power station unit.8th, existing product Fixed form and structure for the guide sleeve of main valve clack guide-localization in valve be usually to be interference fitted by guide sleeve Mode is partially or completely pressed into and is fixed on supporting rack or on valve body (Fig. 1, Fig. 2), and present in this mode the shortcomings that has：One Poor reliability, easily because of steam discharge when judder and collision, the disturbance of the flow at high speed medium and master that may occur The bite of flap and guide sleeve and make guide sleeve deviate from or part deviate from；Second is that assembling 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 performing switching motion, used Driving device (generally using 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 amplification factor to power to transmit the drive of driving device Power, thus valve rod is made to can be obtained thrust and is 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 use split and carry out group 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 employ 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；10th, valve rod and the electromagnetic relief valve of guide's flap split structure, are used for guide's flap and determine 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 so as to make Valve opening velocity be affected；11st, 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 It once there are more serious vortex in road, can significantly increase vibration and noise caused by media flow, while strong shake The dynamic functional reliability that can make valve again and service life decline；12nd, 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 of 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, the elevated-temperature seal reliability of valve sealing face can be made 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 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 during seat impact；Secondly, it is not provided with 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, the gap when main valve clack opens discharge steam in open configuration, 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 main valve clack sealing surface position because the deformation that is brought during no thermal compensation ability and leak this, 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 Valve upper end can have more heat transfers to be leaned on to main valve clack upper end by sealing surface position and the Distance Shortened of high-temperature steam The position of sealing surface reduces the temperature difference in outside in sealing surface.Main valve clack helps to control by increasing above-mentioned thermal compensation slot The deformation that sealing surface position generates due to 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

For the above-mentioned many shortcomings for overcoming existing structure and present in technology, the present invention propose it is a kind of not Entering main valve clack sealing surface there are oxidation corrosion product, nearby influence valve seal and condensation 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 these goals, 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 with auxiliary valve to divide Body formula structure, auxiliary valve are installed on the side of main valve, and the exhaust steam end that valve is used to discharging 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 For supporting and fixing the supporting rack of 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 of the middle section of supporting rack-between interior hub and the outer ring of supporting rack passes through from bottom to top for medium, Between interior hub and outer ring and equipped with multiple dowels, position of the interior hub in valve body is made to be supported and fixed.Valve is by driving Dynamic device drives the valve rod action of auxiliary valve, opens guide's sealing structure and open the main valve clack in main valve.The key of the present invention Technical solution is：Main valve clack uses flap modular construction, and flap component is made of thermal valve valve and outer flap, thermal valve valve and outer flap Be revolution build part, the two for concentric arrangement, thermal valve valve inside and outer flap outside, the two and using threaded engagement connection as 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 During free state when part is in unassembled, there are small gap between the above-mentioned two adjacent conical surface, and it is 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, higher than the vertical height of valve clack sealing surface.Positioned at the outside of flap component, For the guide sleeve of the tubular of flap component guide-localization, lower end installs positioning with cylindrical positioning surface on supporting rack, leads Step surface is equipped with 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 turns round build simultaneously Window-through-flow window of multiple perforations is machined in outer circle, for medium by flowing into inside outside, the upper and lower end face difference of pressure rack On the step on boss lower plane and guide sleeve outer circle on the outside of valve seat 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 is used to connect with the gland steam exhauster of side disposed thereon when installing.

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 Connecting flange is symmetrically arranged with, for installing when connects with the steam discharge elbow of both sides；The material of steam exhaust structure body is stainless steel Material, left and right horizontal channel carry the taper being gradually reduced near aperture or aperture to interior diameter 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 coagulates Room is born water by plane on boss on the outside of valve seat and the valve seat outer circle on the upside of it and the platform of 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 The gap for having annular makes main valve condensation hydroecium be connected with the inner cavity of steam exhaust structure body；It is compressed in valve seat by steam exhaust structure body convex At plane and gasket is provided on platform.

Guide's valve seat is provided in the lower end of auxiliary valve valve deck, guide's valve seat is connected and sealed with auxiliary valve valve deck, on auxiliary valve The guide's sealing surface for performing 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 both during closing with tangent state；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.

The increased loudspeaker of diameter down is equipped 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 equipped with opening up annular Groove-auxiliary valve condensation hydroecium, between the steam through flow hole among auxiliary valve condensation hydroecium and guide's valve seat, have from auxiliary valve condensation 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 condensation water that flows down of hole wall can be flowed into downwards in auxiliary valve condensation water room along the surface of the water guide conical surface.

Sealing at valve body and valve seat mounting surface is using Multiple Combination sealing structure, the Multiple Combination sealing structure packet Metal o-ring and spirotallic gasket containing circular ring shape；The section of the metal o-ring be 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 of internal side diameter and pressure-bearing cavity upper and lower surface Elastic packing tongue that entity is formed, 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 of 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 the groove equidistantly arranged except several is carved 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 not before assembly in During 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 is using 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.

Gland is provided in the upper end of auxiliary valve valve deck, gland is with the outer circle of its lower end and the inner hole of auxiliary valve valve deck upper end With positioning, fixation is installed with screw on auxiliary valve valve deck；The epimere endoporus of gland forms 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 that steam is prevented 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 forms, 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 during the outer diameter processing of resistance ease ring And certain spring expanding or contraction can be generated.

The position at the medium inlet end of rear surface, face valve body in the interior hub of supporting rack, be provided with taper, by with Lower spreader that the circular arc revolution of the plane tangent of interior hub is formed, downwardly projecting；At the middle part of the upper surface of thermal valve valve It is provided with taper, shunting formed by the circular arc revolution tangent with the upper transverse plane of thermal valve valve, 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 connection 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：1st, after the structure described in technical solution using the present invention, it there would not be oxidation The problem of corrosion product and condensation water enter main valve clack sealing surface nearby and influence valve seal；2nd, 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；3rd, the resilient tongue position of main valve clack sealing surface has stronger elastic compensating ability, so as to be more advantageous to Ensure that valve can be chronically at zero leakage condition；4th, the flexible deformation gap at elastic tongue is in the protection of set protection structure Under be not easy to be blocked, thus be more advantageous to ensure valve sealing；5th, the condensation water storage knot set on the upside of auxiliary valve sealing surface Structure solves the problems, such as that the condensation water present in existing product influences auxiliary valve sealing；6th, the lumen sealability energy of main valve and auxiliary valve Access great improvement；Even if external leakage phenomenon occurs in valve lumen under special circumstances, maintenance cost can also drop significantly It is low；7th, guide sleeve can be fixed reliably；8th, 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；9th, 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 the schematic diagram that thermal compensation slot is increased on the outside of the main valve clack sealing surface of electromagnetic relief valve shown in Fig. 2.

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 structure 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 structure 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 condensation water container structure of valve seat location.

Figure 11 is the condensation water container structure of auxiliary valve bonnet lower of the embodiment of the present invention and the signal of guide's sealing structure 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 structure diagram of the auxiliary valve valve deck upper end of the embodiment of the present invention.

Figure 17 is the structure diagram of the supporting rack of the embodiment of the present invention.

In figure, 1, valve body；2nd, supporting rack；2-1, outer ring；2-2, interior hub；2-3, dowel；2-4, lower spreader；3rd, main valve Spring；4th, guide sleeve；5th, 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；6th, pressure rack；6-1、 Through-flow window；7th, 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；8th, valve seat；9th, wave mode circle；10th, gasket；11、 Steam exhaust structure body；11-1, main valve condensation hydroecium；12nd, connecting tube；13rd, auxiliary valve body；14th, valve rod；14-1, valve stem seal face； 14-2, thermal compensation slot；15th, guide's valve seat；15-1, water-resisting wall；15-2, auxiliary valve condensation hydroecium；16th, auxiliary valve valve deck；16-1, water guide The conical surface；17th, divided ring；18th, compound gasket structure；18-1, metal flute profile pad；18-2, wound gasket；19th, lower flange；20th, upper method It is blue；21st, gland steam exhauster；22nd, gland；23rd, auxiliary valve spring；24th, support plate；25th, column；26th, fastening screw nut；27th, adjusting cap；28、 Push rod；29th, driving device；30th, internal resistance ease ring；31st, extrernal resistance ease ring；32nd, V-type metal o-ring；33rd, c-type metal o-ring.

Specific embodiment

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 on 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 It connects simultaneously and compresses valve seat (8), upper flanges are used to connect with the gland steam exhauster of side disposed thereon when installing；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 assembling 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 is 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 the guide's sealing structure for being located at valve rod (14) lower end Envelope pair is in be adjacent to state after assembling 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 axial position is adjusted；Inside is equipped with the driving dress of electromagnet (29) are put 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 enter 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 more than electromagnetic relief valve set-pressure when, pressure switch sends out signal and leads to 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) from sealing surface diameter in the range of the annulus area of flap component (5) outer diameter by the downward active force of steam 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 during discharge state, although still have steam from flap component (5) and guide sleeve (4) it Between gap and pass through the space flowed into pressure passageway (5-8) in flap component (5) of outer flap (5-4) lower end, 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, along with flap Several damping slot (5-7) (see Fig. 7) energy to retardation of the flowing of steam with appropriateness are machined in the outer circle of component (5) 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, powers off electromagnet, 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 outer flap (5-4) lower end 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 differential 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, at the middle part of valve body (1), if The supporting rack (2) for supporting and fixing the parts such as flap component (5) is equipped with, 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), middle section-interior hub (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 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 Into (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；Thermal valve valve (5-1) upper surface 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；Elastic groove (5-3), the elastic groove are additionally provided 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 during 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 employing 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 that can be used as Between to make sealing surface position in height to the temperature difference that effective thermal compensation is carried out on the inside of the sealing surface of upper end, reduces sealing surface medial and lateral Deformation during warm operating mode is obtained outside control, another effect is that the upper side of elastic groove (5-3) seals thermal valve valve (5-1) 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 thickness ratio at the elasticity tongue of cone end employ the both sides steam discharge of similar thermal compensation and elastic compensating structure 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 rather than only by cone end elasticity tongue offer elastic compensating, it is elastic 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 between the cylindrical surface of elastic groove (5-3) and side plane with round-corner transition, 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), 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 thermal compensation similar with employing and the existing electromagnetic relief valve of the both sides steam discharge of elastic compensating structure 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 easily 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) can be as the space for accommodating 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 due to 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, so as to make valve that can maintain preferable sealing performance for a long time under worst hot case.

Installation and fixed structure of another key structure for guide sleeve (4) in the present embodiment technical solution.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 (see Fig. 4), the outer circle of guide sleeve (4) is equipped with the Step-edge Junction of annular for the circular cylindrical projection stop portion installation positioning of support (2) upper end Structure, the upper side of step structure is annular plane；It is clamped in the outside of valve seat (8), from valve seat (8) in valve body (1) and row On the inside of the lower plane of boss between vapour structure (11) lower flange down, pressure rack (6) is additionally provided with, pressure rack (6) is revolution build And window-through-flow window (6-1) of multiple uniformly distributed perforations is machined in outer circle, for medium by flowing into (see Fig. 9) inside outside, 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 respectively 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.During 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 and the access opening discharge for passing through 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, therefore, it is necessary to ensure assembling when pressure rack (6) upper surface and valve seat (8) between will not hold out against.For Increase vibration and noise when preventing when pressure rack (6), guide sleeve (4) be not compacted in an axial direction in steam discharge, in the upper of pressure rack (6) Wave mode circle (9) is provided 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, use to be interference fitted press-in with existing product Mode compare, the fixation of guide sleeve is more reliable, and assembling 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), guide's valve seat (15) (see Figure 11) is provided with, Guide's valve seat (15) is connected and sealed with auxiliary valve valve deck (16) by screw thread and sealing weldering, and the weld seam for sealing weldering is located on screw thread At the outer circle at end, auxiliary valve valve deck (16) and guide's valve seat (15) composition surface, guide's sealing surface that switching motion is performed on auxiliary valve is straight It connects and is arranged on valve rod (14), is provided on the lower part of valve rod (14), guide's valve seat (15) and the valve of valve rod (14) lower part 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 both during closing with tangent state, the sealing surface of guide's valve seat (15) in the present embodiment Cone angle is set as 60 °, the sealing surface of valve stem seal face (14-1) and guide's valve seat (15) by built-up welding and the processing of heap postwelding and 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)；One section of cylindrical section is had from the outer diameter of valve stem seal face (14-1) is past, in the cylindrical section again The increase of downward then outer diameter forms 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.

Relative to the structure of the split of the valve rod and guide's flap of existing product, the technical program uses 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 for 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 preferable comprehensive mechanical performance is kept 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, So as to which guide's sealing surface be made to 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, axial fasten power sealing surface also made to the amplification of power by cone structure under smaller state 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 flat seal of existing product or the sealing structure of 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 The area and the distance of reduction high-temperature medium and uper side surface contacted with high-temperature medium, can allow more heats to be communicated up, It is substantially reduced the temperature difference in the interior outside at sealing surface position, so as to make the uneven heat of valve stem seal face (14-1) at high temperature Deformation is controlled better and then is enhanced the sealing reliability of auxiliary valve guide sealing position and sealing life.

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 set 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, so as to ensure that the Valve opening velocity of valve can be more preferable Ground meets the needs of unit safety protection.

In the technical solution of the present embodiment, lead in the intermediate steam discharge of the auxiliary valve valve deck (16) on the upside of pilot valve seat (15) 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) and groove-auxiliary valve condensation hydroecium (15-2) equipped with opening up annular, auxiliary valve condensation hydroecium Between the intermediate steam through flow hole of (15-2) and guide's valve seat (15), have 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 water guide conical surface (16-1) lower end 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 condensation 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 Condensation water is formed, condensation water can cause the inhomogeneous deformation of sealing surface and cause leakage after flowing back to guide's sealing surface position.This Embodiment condensation 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 be flowed at guide's sealing surface：In the condensation 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), due to the bottom end of auxiliary valve condensation hydroecium (15-2) and the distance of sealing surface Relatively near, temperature is higher, thus the condensation 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 condensation water, since the temperature of valve rod (14) hypomere is higher, thus decline condensation 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 condensation water container structure energy Enough condensation 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 condensation water can flow downward and energy along the conical surface Enough enter auxiliary valve condensation hydroecium (15-2), 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 Metal o-ring (7-1) and spirotallic gasket (7-2) of the Multiple Combination sealing structure (7) stated comprising circular ring shape.The metal The section of sealing ring (7-1) is structure symmetrical above and below, and metal o-ring (7-1) is pressure seal section by inner radius, 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 The level trough of circular ring shape that cavity portion (7-1-1) is cut out in outward direction for the internal diameter middle part 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 of internal side diameter and pressure-bearing cavity upper and lower surface forms elastic packing tongue (7-1-2)；Metal o-ring (7-1) upper and lower surface is located at the annular section on the outside of elastic packing tongue and being inwardly recessed and forms thinned recessed portion (7-1-3). The ladder plane of annular being inwardly recessed is provided on the upper and lower surface of the side of the close outer diameter of metal o-ring (7-1), and Spirotallic gasket (7-2) is placed in the recessed ladder plane.It is located at spirotallic gasket (7-2) in metal o-ring (7-1) And by the upper and lower surface between the pressure seal section of internal diameter side, tooth form seal section is additionally provided with, the tooth form seal section is It is left after the groove equidistantly arranged except several is carved 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 of contact, when being in non-pressured state before assembly, recessed portion is slightly above thinned in the sealing surfaces The upper following table on the surface, in the present embodiment elastic packing tongue (7-1-2) of the metal sealing tooth (7-1-4) on the outside of (7-1-3) Face is 0.15mm higher than the height on metal sealing tooth (7-1-4) surface.

After valve assembling, 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, positioned at pressure-bearing cavity portion (7- 1-1) sealing that the high-pressure medium at place pushes elastic packing tongue (7-1-2) to be more closely affixed to valve body (1) and valve seat (8) is put down Face generates preferable sealing effect；The purpose of recessed portion (7-1-3) is thinned in setting, 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 metal sealing tooth (7-1-4) position Effect be reduce contact area, improve seal pressure so as to improve sealability；In the spirotallic gasket (7- set by outermost 2) wound gasket seal section, the outermost auxiliary sealing structure as Multiple Combination sealing structure are formed.

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) greatly improves the sealing performance of valve seat (8) and valve body (1) installation position and sealing reliability；Spirotallic gasket With the buying of metal o-ring or manufacture 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) is using 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 Employ 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 during high temperature, valve bonnet seal surface hardness decline, connect with metal o-ring Decline specific contact pressure when being plastically deformed at contacting surface because generating, sealing reliability can be caused to reduce；And wound gasket be used alone in Its sealing reliability can not generally be met the requirements during high temperature and high pressure condition.Said combination gasket construction employs 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.

Valve deck and the structure on 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) forms 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 the hypomere endoporus of gland (22) in valve rod The vapor-proof escape structure that steam is prevented 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 formed 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 during 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 Diameter, the side of two kinds of resistance ease rings are splitted with wire cutting and can generate certain spring expanding or contraction；During 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 set 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) prevents discharge of steam and auxiliary valve 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, internal resistance is escaped between ring (30) and valve rod (14), the hypomere endoporus of extrernal resistance ease 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 when 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 during in order to make discharge of steam in valve is more reasonable, rear surface in the interior hub (2-2) of supporting rack (2), 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 Lower spreader (2-4) (see Figure 17 and Fig. 4) formed, downwardly projecting；It is also set at the middle part of the upper surface of thermal valve valve (5-1) It is equipped with taper, point formed by the circular arc revolution tangent with the upper transverse plane of thermal valve valve (5-1), taper protruding upward Flow cone (5-9) (Fig. 7)；In addition, the section shape of hub (2-2) and the dowel (2-3) of outer ring (2-1) in being connected 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 Near is also the more complicated position of steam flow field, and steam at high discharge can generate more serious vortex, meeting when flowing through these positions Enhance vibration and noise caused by discharge of steam.The above-mentioned increased flow dividing structure of technical solution institute or fairing ace, Swiftly flowing steam can be guided, vortex intensity during 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 is the auxiliary valve of main valve is split type, electromagnetic relief valve of top bilateral steam discharge.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；During 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 tool of the steam exhaust structure body (11) of the valve mechanism technical solution of the electromagnetic relief valve of the present embodiment, only 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 sketched or do not applied It states.

In the upside of valve body (1) and valve seat (8), steam exhaust structure body (11) is provided with, the centre of steam exhaust structure body (11) is hung down Straight channel lower part is connected, while steam exhaust structure body by the connecting flange of lower end with bolting connection structure with valve body (1) upper end (11) and with plane on the boss on the outside of the step plane compression valve seat (8) at its lower face, the centre of steam exhaust structure body (11) Vertical channel shunts to form triplet type structure toward arranged on left and right sides direction upwards, and left and right horizontal channel is set in both ends end symmetric There is connecting flange, the connection of the steam discharge elbow of during 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 near aperture to interior diameter.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 condensation water container structure (see Figure 10), institute between steam exhaust structure body (11) and valve seat (8) The condensation 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, main valve condensation hydroecium (11-1) is 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) The aperture that straight channel lower end is located on the upside of valve seat (8) at adjacent regions 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).

During valve steam discharge, driving device drives the action of guide's sealing structure, the connection by connecting major-minor valve in auxiliary valve 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 is due to using the arced flow path being increasingly turned to and the nature when shunting position top tape and having because use 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 enhance vibration and noise during steam discharge.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 a manner 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 condensation 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 condensation 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 is coagulated into main valve Bearing water the condensation water in room (11-1) can gradually vaporize and again in disperse to steam exhaust structure body (11) and gland steam exhauster cavity；Valve seat (8) endoporus can't form condensation 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 condensation water, similary meeting Enter drain water piping with the osculum of condensation water from steam discharge elbow lower end or be trapped in steam discharge elbow, if there is a small amount of oxidation Corrosion product, also can be with condensation water along steam exhaust structure body (11) intermediate vertical channel when 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 are oxidation corrosion products to fall to master The problem of near valve sealing surface.Therefore, technical scheme of the present invention eliminates existing top row vapour electromagnetic relief valve product and easily goes 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, the technical solution that is formed of modification, all spirit and technology without departing from the present invention Essence, still can belong within scope of the presently claimed invention.

Claims (2)

1. a kind of power station main steam system top steam discharge electromagnetic relief valve, the electromagnetic relief valve are the major-minor valve split Formula structure, auxiliary valve are installed on main valve side, and the exhaust steam end of valve is located at the top of main valve, are set in the upper end of valve body of main valve (1) There is a steam exhaust structure body (11), the downside of steam exhaust structure body (11) is connected with valve body (1) upper end with flange while and compresses valve seat (8)；Valve body (1) is welded for revolution three-dimensional-structure, by upper and lower two parts, and supporting rack (2) is equipped at the middle part of valve body (1), The outer ring (2-1) of the annular of supporting rack (2) is embedding to be sandwiched between upper and lower two parts of valve body (1), and the middle section of supporting rack (2)- Circular passage between interior hub (2-2) and outer ring (2-1), passes through from bottom to top for medium, in interior hub (2-2) and outer ring (2- 1) multiple dowels (2-3) are equipped between, position of the interior hub (2-2) in valve body (1) is made to be supported and fixed；Valve is by driving Dynamic device drives auxiliary valve events and opens the main valve clack in main valve, it is characterised in that：Main valve clack uses flap modular construction, valve Valve component (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 is concentric arrangement, thermal valve valve (5-1) inside and outer flap (5-4) outside, the two and using threaded engagement connection as one Body；Thermal valve valve (5-1) upper surface 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 The back side of (5-2) 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 The conical surface of identical taper, flap component (5) in it is unassembled when free state when, there are micro- between the above-mentioned two adjacent conical surface Small gap, and then two conical surfaces are in contact when flap component (5) is pressurized in work condition state；In the thermal valve valve (5-1) Be additionally provided with elastic groove (5-3) at the conical surface, the elastic groove (5-3) includes upper and lower step plane and cylindrical surface, cylindrical surface and With round-corner transition between upper and lower step plane；Outer flap (5-4) is in the upper surface at valve clack sealing surface (5-2) outer diameter Vertical height is higher than the vertical height of valve clack sealing surface (5-2)；It is led positioned at the outside of flap component (5), for flap component (5) To the guide sleeve (4) of the tubular of positioning, lower end installs positioning with cylindrical positioning surface on supporting rack (2), guide sleeve (4) Outer circle is equipped with step surface, and 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 window-through-flow windows (6-1) of multiple perforations is machined in outer circle for medium by flowing into inside outside, pressure rack (6) it is upper and lower End face is located at respectively on the step on the boss lower plane and guide sleeve (4) outer circle on the outside of valve seat (8) between plane,

With upper and lower end connecting flange, upper end connecting flange is used to pacify steam exhaust structure body (11) positioned at valve body of main valve (1) upper end Gland steam exhauster during dress with side disposed thereon connects,

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, during 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 near aperture or aperture to interior diameter；It is set between steam exhaust structure body (11) lower end and valve seat (8) There is cavity-main valve condensation hydroecium (11-1) of annular, main valve condensation hydroecium (11-1) on boss on the outside of valve seat (8) by putting down Face and valve seat (8) outer circle on the upside of it and the stepped hole of steam exhaust structure body (11) intermediate vertical channel lower end are surrounded；Steam discharge knot The aperture that structure body (11) intermediate vertical channel lower end is located on the upside of valve seat (8) at adjacent regions is more than valve seat (8) intermediate channel hole Aperture at the aperture of upper end, 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 Gap there are annular makes main valve condensation hydroecium (11-1) be connected with the inner cavity of steam exhaust structure body (11)；It is arranged in valve seat (8) At plane and gasket (10) is provided on the boss that vapour structure (11) compresses.

2. power station main steam system according to claim 1 top steam discharge electromagnetic relief valve, it is characterised in that：In auxiliary valve The lower end of valve deck (16) is provided with guide's valve seat (15), and guide's valve seat (15) is connected and sealed with auxiliary valve valve deck (16), auxiliary valve The upper guide's sealing surface for performing switching motion is set up directly on the lower parts of valve rod (14), is provided on guide's valve seat (15) and valve rod (14) sealing surface of valve stem seal face (14-1) pairing of lower part；Valve stem seal face (14-1) is spherical surface, on guide's valve seat (15) Sealing surface then to dehisce the downward conical surface in direction, coincide both during closing with tangent state；At valve stem seal face (14-1) Back side is provided with groove-thermal compensation slot (14-2) of annular；One section of cylinder is had from the outer diameter of valve stem seal face (14-1) is past Section, on the cylindrical section another section of cylindrical surface that then outer diameter increase composition is oriented to for the bearing of valve rod (14) lower end still further below, formerly The past circle being arranged with and the above-mentioned cylindrical surface being oriented to for the bearing of valve rod (14) lower end coordinates of the sealing surface of guide valve seat (15) Post holes；From between the cylindrical section of the upside of the above-mentioned cylindrical hole of guide's valve seat (15) and valve stem seal face (14-1) outer diameter down Toroidal cavity is outside, is drilled with uniformly distributed several through flow holes, is also drilled with and is evenly distributed with toward above-mentioned toroidal cavity in valve rod (14) lower face Several through flow holes.