Ventilation stop valveTechnical field
The present invention relates to one kind ventilate stop valve, this ventilation stop valve be often installed in when using on automotive oil tank orIt is connected with fuel tank, its import is communicated with fuel tank, it exports the waste gas recovering device for leading to canister etc, under normal circumstancesThe respiratory function inside and outside fuel tank is realized, the air pressure balance of fuel tank inner chamber and ambient atmosphere is kept；Oil is cut off in abnormal casesRoadlock stops fuel oil and leaked.
Background technology
Ventilation stop valve is usually mounted with oil tank of vehicle, this ventilation stop valve is often installed in automobile oil when usingOn case, valve body, which is stretched at fuel tank, the import of valve, to be located at below valve body or periphery, or valve is connected with automotive oil tank；The outlet position of valveIn bonnet portion, the outlet of valve leads to the waste gas recovering device of canister etc.In vehicle in use, this ventilation stop valve have withLower effect：The respiratory function inside and outside fuel tank is realized under normal circumstances, keeps the air pressure balance of fuel tank inner chamber and ambient atmosphere；ExampleSuch as, passage is formed with extraneous by stop valve of ventilating when oil tank of vehicle refuels, the air in fuel tank is discharged along the passage, makes oilAir in case keeps internal and external pressure balance with external atmosphere pressure so that fuel oil swimmingly injects；Vehicle travel process is with combustionThe consumption of oil, is synchronously inflated by the ventilation stop valve into fuel tank；Fuel tank heavy curtain is moved when vehicle is travelled, and causes air pressure wink in fuel tankWhen rise or fall, by the ventilation stop valve into fuel tank synchronously be vented or inflate；When air pressure rises sharply in fuel tank, such as by the sunIt is exposed to the sun, or rapid drawdown, such as there's a sudden fall in temperature, is synchronously vented or inflates into fuel tank by the ventilation stop valve.Hinder in abnormal casesOnly fuel oil leaks, and this function is even more important；Abnormal conditions are primarily referred to as the position suddenly change of fuel tank, when such as vehicle side is overturn,Ventilation stop valve can be automatically cut off, to prevent fuel oil from flowing out；In addition, when fuel tank refuels and reaches setting position, or vehicle is seriousTilt or acutely heavy curtain is moved, ventilation stop valve is closed automatically, prevents fuel oil from being overflowed from the passage.So, this ventilation stop valveBasic function is exactly under normal circumstances, to realize the respiratory function inside and outside fuel tank, and in abnormal cases, realizes that oil circuit is cut offFunction.This ventilation stop valve is also referred to as overflow cutting valve, balanced valve, turn-over stop valve, roll-over valve etc..
The such ventilation stop valve having been known, such as Application No. 200610144421.7,200780013501.1,201210229757.9th, in 201310436953.8,201310438429.4 Chinese patent open source literature, this is respectively describedPlant the example of valve.To realize the function of above-described this valve, the design of the ventilation stop valve described by these examples from itsFunctionally include on a stop valve for being used to cut off oil circuit and a breather valve for realizing the inside and outside ventilation of fuel tank, concrete structureInclude valve body and bonnet, bonnet is provided with outlet；Valve body includes housing, and bonnet is covered in the top of housing, enclosure interior it is nearA floating core that can be moved up and down along inner walls is provided with below the dividing wall that upper end position is provided with dividing wall, housing,Sealing mechanism is set with dividing wall above floating core, so as to form stop valve, moves up and down to realize opening for stop valve by floating coreLogical and closing, under normal circumstances, floating core is below position, when there are abnormal conditions, and floating core, which is moved up, makes sealing mechanismSealing is realized, stop valve is closed.Breather valve is also referred to as pressure-keeping mechanism, above the dividing wall for being arranged on enclosure interior, forms gasPassage.But the setting of the exhaust passage of the ventilation stop valve described by these examples, to the row under different barometric informations in fuel tankThe adaptability of gas or inflation requirements is also inadequate, and the action stability of breather valve is also inadequate, especially, described by these examplesVentilation stop valve stop valve action stability when closed it is also inadequate, easily occur seal between offset from each other,Cause a small amount of fuel leakage；It will be appreciated that vehicle needs to use under the conditions of different geographical environments, seasonal climate, in its fuel tankAir pressure change situation gap it is huge, even if under the conditions of same geographical environment, seasonal climate, air pressure when using in its fuel tankIt can vary widely；The ventilation sealing mechanism of stop valve and the organization plan of pressure-keeping mechanism described by these examples needFurther rationalize is improved, further to lift the reliability of its sealing mechanism and pressure-keeping mechanism so that sealing mechanism it is closeThe pressure maintaining performance of sealing property and pressure-keeping mechanism is more preferable.
The present invention is precisely in order to solve above-mentioned technical problem.
The content of the invention
The technical problems to be solved by the invention are to be distributed to fit with multiple air flues there is provided one kind for the above-mentioned state of the artAnswer in fuel tank the exhaust demand under different barometric informations, and the pressure maintaining performance of sealing property and pressure-keeping mechanism is preferably ventilated cut-outValve.
The present invention solve the technical scheme that is used of above-mentioned technical problem for：
One kind ventilation stop valve, including valve body (1) and bonnet (2), bonnet (2) are used as fluid passage provided with external-connected port (3)Mouthful, valve body (1) is located at the lower section of bonnet (2), and the housing (8) that valve body (1) includes being internally provided with dividing wall (4) is isolated with being located atBreather valve (5) above wall (4), the stop valve (6) below dividing wall (4), the dividing wall (4) open up fluid passage holes(7), the bonnet (2) is covered in the top of housing (8) and is fixedly connected with bonnet (2), under the dividing wall (4) in housing (8)Side is provided with a floating core (9) that can be moved up and down along housing (8) inwall, and floating core (9) sets close between dividing wall (4) aboveSealing mechanism, so as to form stop valve (6), moves up and down to realize opening and closing for stop valve (6), normally by floating core (9)In the case of, floating core (9) is below position, when there are abnormal conditions, and floating core (9) moves up that to realize sealing mechanism closeEnvelope, stop valve (6) is closed；Housing (8) lower end also sets up housing bottom plate (10), housing bottom plate (10) and/or housing(8) periphery is provided with fluid intake (11), and the dividing wall (4) through housing (8) to the fluid issuing (3) of bonnet (2) forms fluidPassage, sets the big spring (12) of compression, it is characterised in that the isolation between the floating core (9) and housing bottom plate (10)Wall (4) is set along the fluid passage holes (7) periphery upper convex ring (18) protruding upward above, is offered on the upper convex ring (18)For the small gap (19) ventilated in a small amount；The breather valve (5) above dividing wall (4) includes pressurize seat (30), pressurizeBall (32) and pressurize spring (33), pressurize seat (30) are shelved on dividing wall (4) above, and housing (8) upper end sets housing upper endPlate (41), pressurize spring (33) is located between housing upper head plate and pressurize seat (30), and the bottom of pressurize spring (33) is sleeved onOutside pressurize seat (30)；The face that contacts with each other of pressurize seat (30) and dividing wall (4) upper convex ring (18) forms sealing and coordinated, and protectsThe inwall of wedge (30) and the housing (8) of its position leaves space；Pressurize seat (30) center opens up pressurize through hole (34), shouldPressurize through hole (34) is less than the taper of pressurize ball (32) diameter in the upper end position formation top ports diameter of nearly pressurize seat (30)Contraction mouth, pressurize ball (32) is located in pressurize through hole (34)；When fuel tank internal pressure is more than external atmosphere pressure, draught head is more than footDuring gravity to overcome pressurize ball (32), pressurize ball (32) is adjacent to taper contraction mouth by air pressure jack-up, makes pressurize through hole(34) sealing is formed；Otherwise pressurize ball (32) is fallen from contraction mouth by its own Action of Gravity Field, makes pressurize through hole (34) formation gasPassage.
It is provided for preventing the hold item of pressurize ball (32) tenesmus in the pressurize through hole (34) of the pressurize seat (30).
The pressurize seat (30) is that three layers of cylinder are superimposed to be formed, including bottom (13), center pillar (15) and upper prop (16), onPost (16) opens up the taper contraction mouth, and the periphery of center pillar (15) opens up mounting hole (20), mounting hole (20) insertion straight pin(21) as the hold item for preventing pressurize ball (32) tenesmus.
The pressurize ball (32) is ceramic ball or the suitable metal ball of weight.
The sealing mechanism shelves face (25) and rubber gasket (14), institute including being arranged on the projection of floating core (9) aboveState rubber gasket (14) and be fitted in projection and shelve on face (25), rubber gasket (14) includes fixing end and free end, it is consolidatedFixed end is arranged on floating core (9) above by clip (27), and the sealing mechanism also includes being arranged on dividing wall (4) below, edgeThe downwardly projecting lower flange collar (17) suitable for the rubber gasket (14) palette in fluid passage holes (7) periphery.
The projection of the floating core (9) above shelves face (25) for slope, and the lower flange collar (17) of the dividing wall (4) is alsoCorresponding slope；The projection of the floating core (9) above shelves face (25) and is arranged to add to the multiple small convex of surface roughnessMuscle, the slope that the multiple small convex rib shelves face (25) along projection is arranged in order.
The clip (27) is made by elastomeric material, in gate-shaped, and the bottom of its both sides sets raised button (28)；Accordingly, the both sides at the floating core (9) clip installed above (27) place set what the projection for clip (27) buckled that (28) buckle into buckleHole.
The outer wall of the housing (8) is symmetrical arranged 2 buckle ears (44), accordingly, and the bonnet (2) is symmetrical arranged for insertingEnter extend downwardly 2 insertion pieces (45) of housing (8) buckle ear (44).
Annular groove (48), embedded O-ring seals (49) are opened up at the outer wall that the top of the housing (8) is connected with bonnet (2).
The vertical convex tendon (50) that the inwall of the housing (8) is moved up and down at least provided with the floating core (9) of 2 guidings, accordinglyAt least provided with 2 vertical grooves matched therewith (51) on the outside of the floating core (9)；The floating core (9) is the heavy wall of lower ending openingTubular article, its barrel lower end opens up annular deep trouth (22), and the epimere of the big spring (12) is fitted into deep trouth (22)；It is opened inThe fluid intake (11) of housing bottom plate (10) includes centre bore (23), and ring centre bore (23) sets protuberance protruding upward(54), it is opened in the fluid intake of housing bottom plate (10) (11) also multiple at the protuberance (54) periphery including being opened inInlet hole (24)；Housing upper head plate (41) also opens up multiple clearance opening (56) as fluid passage mouthful；In the housing (8) peripheryClose dividing wall (4) lower position be provided with fluid intake (11).
Present invention ventilation stop valve wins the chief of prior art kinds of schemes, due to the pressurize of present invention ventilation stop valveMechanism uses pressurize ball as gas channel switch part, simple in construction, is active in one's movements, easy for installation；Scheme compared with the prior art,The pressure maintaining performance of pressure-keeping mechanism is more preferable.In addition, when usually the draught head inside and outside fuel tank is less than setting value, using fixed small gap holeExhaust, when the draught head inside and outside fuel tank is more than setting value, is then turned on breather valve Quick air-discharge, so more can meticulously adapt to oilExhaust demand in case under different barometric informations.
Brief description of the drawings
Fig. 1 is the overall schematic perspective view of present invention ventilation stop valve；
Fig. 2 is installed in view below vehicle fuel pump assembly ring flange for present invention ventilation stop valve；
Fig. 3 is the valve body schematic perspective view of present invention ventilation stop valve；
Fig. 4 is the valve body diagrammatic cross-section of present invention ventilation stop valve；
Fig. 5 is the housing of valve body of the present invention, O-ring seals and the stop valve component parts schematic perspective view below dividing wall；
Fig. 6 is the floating core assembly schematic perspective view of present invention ventilation stop valve；
Fig. 7 is the breather valve component parts schematic perspective view above dividing wall；
Fig. 8 is housing overlook direction schematic perspective view；
Fig. 9 is part D enlarged diagrams in Fig. 8；
Figure 10 is that housing looks up direction schematic perspective view；
Figure 11 is not shown for the present invention ventilation stop valve seal receptacle during jack-up by the outside exhaust condition of small gap on upper convex ringIt is intended to；
Outside exhaust condition schematic diagram when Figure 12 ventilates stop valve seal receptacle by jack-up for the present invention；
Inside tonifying Qi view when Figure 13 is rushed to open for present invention ventilation stop valve pressurize ball.
Embodiment
Below with described in detail shown in Fig. 1 to Figure 13 the present invention embodiment.
One kind ventilation stop valve, as shown in figure 1, including valve body 1 and bonnet 2, bonnet 2 is used as fluid provided with external-connected port 3Passway, valve body 1 is located at the lower section of bonnet 2.
As shown in figure 4, valve body 1 includes setting inside housing 8, the breather valve 5 being arranged inside housing 8, stop valve 6, housing 8Dividing wall 4 is equipped with, the top of dividing wall 4 of housing 8 sets breather valve 5, and the lower section of dividing wall 4 sets stop valve 6, and dividing wall 4 is opened upFluid passage holes 7.Bonnet 2 is covered in the top of housing 8 and is fixedly connected with bonnet 2.The lower section of dividing wall 4 in housing 8 is setThere is a floating core 9 that can be moved up and down along the inwall of housing 8, floating core 9 sets sealing mechanism between dividing wall 4 above, so that shapeInto stop valve 6, move up and down to realize opening and closing for stop valve 6 by floating core 9.Under normal circumstances, core 9 is floated to be belowPosition, when there are abnormal conditions, floating core 9, which is moved up, makes sealing mechanism realize sealing, and stop valve 6 is closed.The lower end of housing 8 is alsoHousing bottom plate 10 is set, and housing bottom plate 10 and/or the periphery of housing 8 are provided with fluid intake 11, and the dividing wall 4 through housing 8To the formation of fluid issuing 3 fluid passage of bonnet 2, the big spring 12 that compression is set between core 9 and housing bottom plate 10, isolation are floatedWall 4 is set along the periphery of fluid passage holes 7 upper convex ring 18 protruding upward above, is offered on the upper convex ring 18 for ventilating in a small amountSmall gap 19, referring to Fig. 8, Fig. 9.Breather valve 5 positioned at the top of dividing wall 4 includes pressurize seat 30, pressurize ball 32 and pressurizeSpring 33, pressurize seat 30 is shelved on above dividing wall 4, and the upper end of housing 8 sets housing upper head plate 41, and pressurize spring 33 is located at housingBetween 8 upper head plates and pressurize seat 30, and the bottom of pressurize spring 33 is sleeved on the outside of pressurize seat 30；Pressurize seat 30 and dividing wall 4The face that contacts with each other of upper convex ring 18 forms sealing and coordinated, and the inwall of pressurize seat 30 and the housing 8 of its position leaves space.30 centers of pressurize seat open up pressurize through hole 34, and the pressurize through hole 34 is small in the upper end position formation top ports diameter of nearly pressurize seat 30In the taper contraction mouth of the diameter of pressurize ball 32, and the diameter of part below the taper contraction mouth of pressurize through hole 34 is justified more than pressurizeThe diameter of pearl 32, pressurize ball 32 is located in pressurize through hole 34；When fuel tank internal pressure is more than external atmosphere pressure, draught head, which is more than, to be enoughWhen overcoming the gravity of pressurize ball 32, pressurize ball 32 is adjacent to taper contraction mouth by air pressure jack-up, forms pressurize through hole 34Sealing；Otherwise pressurize ball 32 is fallen from contraction mouth by its own Action of Gravity Field, makes the formation gas passage of pressurize through hole 34.
Because the diameter of part below the taper contraction mouth of pressurize through hole 34 is more than the diameter of pressurize ball 32, in order to prevent protectingPressure ball 32 falls, and is provided for preventing the hold item of the tenesmus of pressurize ball 32 in the pressurize through hole 34 of pressurize seat 30.Such as Fig. 7 institutesShow, pressurize seat 30 is that three layers of cylinder are superimposed to be formed, including bottom 13, center pillar 15 and upper prop 16, upper prop 16 opens up taper contractionMouthful, the periphery of center pillar 15 opens up mounting hole 20, and mounting hole 20 inserts straight pin 21 as putting that prevention pressurize ball 32 dropsPut part.Pressurize ball 32 is ceramic ball or the suitable metal ball of weight.The material of pressurize ball 32 is directly connected to its quiltAir pressure jack-up is adjacent to sealing property during 34 taper contraction mouth of pressurize through hole；The weight of pressurize ball 32 is directly connected to this hairThe setting value of the inner and outer air pressure difference of bright ventilation stop valve.Pressurize ball 32 is adapted to using ceramic ball, can be at home to correlationProducer orders.Pressurize seat 30, pressurize ball 32, pressurize spring 33, straight pin 21, the isolation of housing upper head plate 41 and housing 8The above section of wall 4 collectively forms the component parts of pressure-keeping mechanism.
As shown in Figure 4, Figure 5, the projection that sealing mechanism includes being arranged on above floating core 9 shelves face 25 and rubber gasket14, rubber gasket 14 is fitted in projection and shelved on face 25, and rubber gasket 14 includes fixing end and free end, and its fixing end is led toClip 27 is crossed to be arranged on above floating core 9；As shown in Figure 10, sealing mechanism also includes being arranged on below dividing wall 4, logical along fluidThe downwardly projecting lower flange collar 17 suitable for the palette of rubber gasket 14 in the periphery of road hole 7.As shown in fig. 6, floating core 9 is with being arranged onRubber gasket 14 and clip 27 above it constitute floating core assembly；Under normal circumstances, as shown in figure 4, floating core assembly itselfWeight is with supporting the elastic force of its big spring 12 to reach dynamic balance so that stop valve 6 is in opening.It is convex above floating core 9Rise and shelve face 25 for slope, the lower flange collar 17 of dividing wall 4 is also corresponding slope；Projection above floating core 9 shelves face 25Multiple small convex ribs are set, and multiple small convex ribs are arranged in order along the raised slope for shelving face 25, to increase surface roughness.It is fixedButton 27 is made by elastomeric material, can specifically use excellent spring plastic injection piece；Clip 27 is in gate-shaped, the bottom of its both sidesRaised button 28 is set；Accordingly, the settable projection for clip 27 in both sides at floating core 9 clip 27 installed above is buckled 28 and buckledThe button hole entered.Floating core 9, seal receptacle 13 can use plastic injection piece.Rubber gasket 14 is made using rubber, can be at home to phaseThe buying of shutout man.
As shown in Fig. 3, Fig. 5, the outer wall of housing 8 is symmetrical arranged 2 buckle ears 44, accordingly, and bonnet 2 is symmetrical arranged for insertingEnter extend downwardly 2 insertion pieces 45 of the buckle ear 44 of housing 8.Annular groove is opened up at the outer wall that the top of housing 8 is connected with bonnet 248, embedded O-ring seals 49.
As shown in Figure 10, the vertical convex tendon 50 that the inwall of housing 8 is moved up and down at least provided with the floating core 9 of 2 guidings, accordingly, as shown in fig. 6, the floating outside of core 9 is at least provided with 2 vertical grooves matched therewith 51；As shown in figure 4, floating core 9 is opened for lower endThe heavy wall tubular article of mouth, its barrel lower end opens up annular deep trouth 22, and the epimere of big spring 12 is fitted into deep trouth 22；Such as Fig. 5 institutesShow, being opened in the fluid intake 11 of housing bottom plate 10 includes centre bore 23, and ring centre bore 23 sets protuberance protruding upward54, being opened in the fluid intake 11 of housing bottom plate 10 also includes being opened in multiple inlet holes at the periphery of the protuberance 5424；As shown in fig. 7, housing upper head plate 41 also opens up multiple clearance opening 56 as fluid passage mouthful；As shown in Figure 5, Figure 8, in shellThe lower position of close dividing wall 4 of the periphery of body 8 is provided with fluid intake 11.Floating core assembly, big spring 12, housing bottom plate 10 andThe dividing wall of housing 8 partly collectively forms the component parts of stop valve below 4.
In present invention ventilation stop valve, rubber gasket 14, O-ring seals 49 are made using rubber, big spring 12, pressurizeSpring 33 uses metal spring, and pressurize ball 32 is adapted to using ceramic ball, other to use plastic injection piece.
Present invention ventilation stop valve is installed in automotive oil tank upper lid when using is following, or, as shown in Fig. 2 installingBelow vehicle fuel pump assembly ring flange 35；Valve body stretches into fuel tank, and the external-connected port 3 positioned at bonnet 2 leads to canister etcWaste gas recovering device.The basic function of present invention ventilation stop valve is exactly under normal circumstances, to realize the work of breathing inside and outside fuel tankCan, keep the air pressure balance of fuel tank inner chamber and ambient atmosphere；And in abnormal cases, realize oil circuit cutting function.
In the condition of normal use, the floating core assembly own wt of present invention ventilation stop valve is with supporting the big of it for vehicleThe elastic force of spring 12 reaches dynamic balance so that stop valve 6 is in opening all the time.The such situation of detailed description below it is severalSpecific situation.
When draught head inside and outside fuel tank is less than setting value, pressurize seat 30, straight pin 21 and the pressurize spring 33 of breather valve 5 existUnder the elastic force of its own weight and pressurize spring 33 is acted on, pressurize seat 30 is shelved and is fitted in above the upper convex ring 18 of dividing wall 4,Breather valve 5 is closed.Draught head refers to the difference of the air pressure of general headquarters and external atmosphere pressure in fuel tank.
Situation 1：Fuel tank internal pressure be more than external atmosphere pressure, draught head be less than setting value when, ventilate stop valve breather valve 5 toOuter exhaust.For example, making the air in fuel tank be discharged along the passage during oil tank of vehicle oiling so that the air and the external world in fuel tank are bigAir pressure keeps internal and external pressure balance so that fuel oil swimmingly injects.Air in fuel tank is from housing bottom plate 10 and the periphery of housing 8Set fluid intake 11 enters in housing 8；, still can be from the periphery of housing 8 after the fuel oil in fuel tank submerges housing bottom plate 10Set fluid intake 11 enters in housing 8；As shown in figure 11, now in ventilation stop valve air from the upper convex ring of dividing wall 4The upper space for the dividing wall 4 that the small gap 19 opened up on 18 enters in housing 8, then the external-connected port 3 through bonnet 2 are discharged.
Situation 2：Fuel tank internal pressure be more than external atmosphere pressure, draught head be more than setting value when, ventilate stop valve breather valve 5 toOuter exhaust.For example, fuel tank heavy curtain is moved during vehicle traveling, cause air pressure in fuel tank instantaneously to rise, by the ventilation stop valve outwardlySynchronous exhaust；For another when air pressure persistently rises sharply in fuel tank, being such as exposed to the sun, outwardly synchronously arranged by the ventilation stop valve by the sunGas.As shown in figure 12, because the draught head that tank pressure is more than external atmosphere pressure is more than setting value, the row of small gap 19 is only relied onGas has had little time, and at this moment the air of larger pressure has been enough to overcome pressurize seat 30, pressurize spring 33, straight pin 21 itself in valveThe elastic force of weight and pressurize spring 33, upward jack-up pressurize seat 30 so that the air of larger pressure is from pressurize seat 30 and its in valveThe upper space for the dividing wall 4 that space between the inwall of the housing 8 of position enters in housing 8, then through the external of bonnet 2Discharge port 3.
Situation 3：Fuel tank internal pressure is less than external atmosphere pressure, the inside tonifying Qi of breather valve 5 for stop valve of ventilating.For example, vehicle rowJourney is crossed with the consumption of fuel oil, is synchronously inflated into fuel tank by the ventilation stop valve so that air and the external world in fuel tankAtmospheric pressure keeps internal and external pressure balance；For example, fuel tank heavy curtain is moved during vehicle traveling, air pressure in fuel tank is caused instantaneously to decline, by thisVentilation stop valve is synchronously inflated into fuel tank；For another when air pressure rapid drawdown in fuel tank, such as there's a sudden fall in temperature, passes through the ventilation stop valveSynchronously inflated into fuel tank.As shown in figure 13, now, the isolation that outside air enters in housing 8 from the external-connected port 3 of bonnet 2The top of wall 4, the bottom for the dividing wall 4 that the small gap 19 that a part is opened up from the upper convex ring 18 of dividing wall 4 enters in housing 8Space and fuel tank；Simultaneously as the pressurize ball 32 in pressurize 30 pressurize through holes 34 of seat once loses the upper of upper qi of chong channel ascending adversely pressureImpulse force, will drop and depart from taper contraction mouth and be shelved on straight pin 21, outside air enters shell from pressurize through hole 34 simultaneouslyThe lower space and fuel tank of dividing wall 4 in body 8.
Described above is vehicle in situation about normally using, the floating core assembly own wt and branch of present invention ventilation stop valveThe elastic force for supportting its big spring 12 reaches dynamic balance, and stop valve 6 is in opening all the time, referring to Figure 11 to Figure 13.
Fuel oil is prevented to leak in abnormal cases, this function is even more important.Dash forward the position that abnormal conditions are primarily referred to as fuel tankSo change, when such as vehicle side is overturn, ventilation stop valve can be automatically cut off, to prevent fuel oil from flowing out；In addition, being reached when fuel tank refuelsDuring setting position, or vehicle knockdown or violent heavy curtain are moved, and ventilation stop valve is closed automatically, prevents fuel oil from being overflowed from the passage.The action of the such situation valve of detailed description below.
When vehicle side is overturn, because ventilation stop valve is horizontal with vehicle, floating core assembly own wt can not have been resisted greatlyThe elastic force of spring 12, floating core assembly is moved under the elastic force effect of big spring 12 along the inwall convex tendon 50 of housing 8 to bonnet direction,So that the lower flange collar 17 of the palette dividing wall 4 of rubber gasket 14 for the sealing mechanism being arranged on above floating core, realizes oil circuitCut-out.Or situation during vehicle knockdown is also similar.
When fuel tank, which refuels, reaches setting position, it is immersed in as shown in figure 4, at this moment floating core 9 in fuel oil, the bullet of big spring 12Power is greater than the gravity of floating core assembly plus the buoyancy of floating core 9, and floating inwall convex tendon 50 of the core assembly along housing 8 is moved up, madeThe lower flange collar 17 of the palette dividing wall 4 of rubber gasket 14 for the sealing mechanism that must be arranged on above floating core, realizes that oil circuit is cutIt is disconnected.The situation of the violent heavy curtain of vehicle dynamic moment is also similar.
Further, since the projection that valve is floated above core 9 shelve face 25 and dividing wall 4 the use slope of lower flange collar 17 fit it is closeEnvelope design, it is easy relative to the design of plane gluing, sealing to open, be conducive to reopening after gluing, sealing.