CN1053667A - Unidirectional membrance rupture valve - Google Patents

Abstract

The present invention is a kind of unidirectional membrance rupture valve that is used for oil tank subsurface injection suppression system, main feature is to dispose the circular valve plate that is made of two semicircle valve plates that can rotate separately and simultaneously in the annular valve, valve body one side disposes diaphragm, be subjected to the time spent of doing of fire-extinguishing foam stream when valve plate, semicircle valve plate promptly rotates and rupture disc voluntarily, thereby opens the foam flow passage.The present invention is simple in structure, has both had good sealing property, and rupture of membranes is reliable again rapidly, can guarantee oil tank early gate device reliability of operation in the ejecting extinguishing system.

Description

Unidirectional membrance rupture valve

The present invention relates to valve, be a kind of desmorrhexis barrier film, when a side overvoltage, make film rupture and the valve opened.

As everyone knows, the large oil tank system of storage oil product or inflammable and explosive chemical product must be equipped with brute force and fire-fighting system efficiently, and reliable.Compare from extinguishing method oil tank, adopt subsurface injection fire extinguishing scheme obviously can more effectively put out the oil tank condition of a fire than fire extinguishing more than liquid level, particularly along with the birth of fluoroprotein foam concentrate fire-extinguishing agent, from domestic and international just this fire-extinguishing technology of research and extension energetically of the seventies, the subsurface injection suppression system has been installed also in some oil tank system.But the oil tank that this class suppression system is installed still has the situation that boundless big fire takes place, and what the subsurface injection system had when putting out a fire to save life and property the oil tank big fire is inoperative, trace it to its cause be oil tank and foam extinguishing system it

Between valve do not open, then fluoroprotein foam just can't be spurted into oil tank, therefore, the subsurface injection suppression system is played a role, key will be resolved the valving before the oil tank.In retrieval, found the report of jar early gate device in some subsurface injection suppression systems to prior art, commonly the valving in the foam pipeline is a gate valve and an one-way valve before at the bottom of the jar, the inherent defect of these two kinds of valves is oil impregnates, cause oil plant infiltration fire line even penetrate into fire-pump room, the management of the system of giving and safety have been brought many new problems, though in the international standard clearly at the bottom of the regulation jar gate valve often open at ordinary times, but in practice because of the one-way valve leakage problems can't resolve, so a jar end gate valve still is normally closed in the existing subsurface injection suppression system.This has produced another problem again, in case the oil tank detonation is on fire, when a slice was trickled big fire in the fire-dike, personnel just can't remove to open gate valve near oil tank, and the subsurface injection suppression system is also just malfunctioning.Can open rapidly for reaching when oil tank is on fire, even can open the foam pipeline passway automatically, someone has proposed multiple design proposal, a kind of is to install a butterfly valve that has glass plate in the foam pipeline additional, cut off by glass plate at ordinary times and the sealing oil plant, make it break brokenly the glass flat board into pieces by manually rotating butterfly plate during fire extinguishing and allow foam pass through.Though the speed that adopts this scheme to open valve can improve, but the butterfly valve of under the maccessiable situation of personnel, not opening equally, perhaps, though butterfly valve is opened, but broken chips of glass can be deposited on low-lying places such as valve pool with the foam that flows, the fire extinguishing late gate just again closes not close, and the result can bring bigger trouble; Another kind of scheme is to install a rupture disk-diaphragm between gate valve and one-way valve additional, this diaphragm can play and cut off and seal action, prevent that the oil in the oil tank from permeating to fire-fighting system, promptly this diaphragm is being opened the static pressure that can sustain oil tank under the situation of gate valve, in case when the pressure of opposite side surpasses this static pressure, just can make rupture of diaphragm, so at ordinary times with this diaphragm partition oil plant, during fire extinguishing with the strength of foam or water with its bursting, thereby get through the foam passage automatically and promptly.Reported the i.e. example of scheme utilization for this reason of " application of rupture disk on the light oil jar " literary composition on the 7th the 4th phase of volume that China publishes " oil gas accumulating " magazine in August, 1988.Technically, this scheme is rather desirable, simple in structure such as having, the advantage of can the utmost point promptly opening the foam passage, but to select one in force and guarantee practical diaphragm, in calculating and material selection is very difficult, particularly also none calculates formula of diaphragm thickness accurately so far, also exist in the existing diaphragm thickness approximate formula and how correctly determine problems such as Rupture of Membrane pressure and choose reasonable diaphragm safety coefficient, in addition, adopt the fragility diaphragm also to exist with the same problem of glass plate.So far, still find no the technology contents identical in the retrieval with theme of the present invention.

The invention provides a kind of membrane-breaking valve of novel structure, be loaded on and often open a sluice gate in valve and the one-way valve pipeline afterwards, can the seal tube road, again can be under the effect of foam pressure rupture of membranes rapidly and automatically, guarantee that pipeline has enough circulation areas and carries out the subsurface injection foam fire-fighting in time.

In technological scheme of the present invention, valve body is designed to and the corresponding cirque structure of pipeline, two close round door envelopes that are made into of semicircle valve plate, and cover a side of valve channel, its outer surface and valve body sealing surface are in same plane, on the valve body sealing surface of this side, a special diaphragm of selecting as calculated arranged with crimping or bonding mode are closely connected, then this diaphragm is also mutually closely connected with valve plate, like this, be subjected on the diaphragm fixed static pressure just can be passed to valve plate equably with the oil tank oil level, not only guaranteed the intensity of diaphragm but also made pipeline non-leakage; Nearly valve body center position respectively is set with a rotating shaft on the two halves circular valve plate back side, forms the semicircle door that two fans are opened to the diaphragm direction, and the supporting base at rotating shaft two ends is then radially inlayed and fitted in the valve body.Two semicircle valve plates are like this formed the round door envelope at ordinary times, but when bearing the impact force of fire-extinguishing foam at the valve plate back side, because the power that on every semicircle valve plate, is subjected to, stress surface difference because of rotating shaft both sides valve plate, then the phase countershaft produces a moment, two semicircle valve plates just rotate to the diaphragm direction simultaneously, consequently the outer periphery of valve plate is sheared diaphragm simultaneously, diaphragm is promptly intactly broken, thereby opened the path of travel of foamite extinguisher, put out a fire at the bottom of fire-extinguishing foam just can fling jar.In the pipeline before as above the membrane-breaking valve of structure generally is installed at the bottom of the oil tank after gate valve and the one-way valve, and make a side that valve body has diaphragm, clamp sealing with piping flange towards the oil tank direction.

Therefore advantage of the present invention is, plays to cut off and the diaphragm of sealing channel effect is close on the valve body securely, and this valve body is clamped again to be sealed in the pipeline, then can guarantee non-leakage; The diaphragm compression face all is close on the valve plate, then valve plate becomes the supporting element of diaphragm again, and the static pressure that is subjected on the diaphragm is all passed to valve plate and born, so only bear pressure stress and do not bear tensile stress at diaphragm at ordinary times, this just can relatively reduce the selection requirement to diaphragm, finds suitable diaphragm easily.Usually select for use stainless steel membrane, aluminium film, nickel film all can.With regard to the rupture of membranes mode, two semicircle valve plates are at fire-extinguishing foam stream effect backspin then rupture of membranes, not only rapidly but also reliable, and are to make diaphragm broken entirely, have guaranteed effective aisle spare, can not produce other pair effect again.

Description of drawings:

Fig. 1 is a structure front view of the present invention, has made broken section among the figure.

Fig. 2 is that the present invention is at ducted installment state and valve plate opening direction schematic representation thereof.

Embodiments of the invention as shown in drawings.See by Fig. 1,2, crimping is covered with a diaphragm 1 that becomes with corrosion-resistant aluminium leather on the annular valve 2 one side sealing faces, in body cavity, dispose two semicircular valve plates 3, these two valve plates constitute a close round door envelope of joining, cover a side of valve body 2 band diaphragms 1, and make the outer surface of valve plate 3 equal with the sealing surface of valve body 2, the back side at two valve plates is connected with a rotating shaft 4 with rivet 6, this rotating shaft two ends are with supporting screw 5 supportings that penetrate valve body 2, and promptly valve plate 3 can rotate around supporting point by the rotating shaft that is connected mutually with it 4 when being subjected to moment loading.

See by Fig. 2, diaphragm 1 gate valve before jar, the opening direction of valve plate 3 is towards diaphragm 1.Plane integrity (planeness) when sealing for keeping two semicircle valve plates to fit in a round door in the present embodiment each Bevel interface of the jointing of two semicircle valve plates 3, is opened with assurance is two-door simultaneously to keep jointing not have movement clearance.

Claims (2)

1, a kind of valve body and valve plate of comprising, even rupture of diaphragm when valve plate one side overvoltage and the unidirectional membrance rupture valve opened, it is characterized in that closely connected on the annular valve 2 one side sealing faces diaphragm 1 being arranged, valve plate was formed by two semicircle 3 close joining of valve plate, cover the same side of closely connected diaphragm 1 on the valve body 2, nearly valve body 2 center positions respectively are provided with a rotating shaft 4 on two valve plate 3 back sides, and support with the supporting screw 5 that is embedded in the valve body 2 at these rotating shaft two ends.

2, unidirectional membrance rupture valve according to claim 1 is characterized in that said two close semicircle valve plates 3 of joining are at its close each Bevel interface of jointing of joining.

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