CN101746259B

CN101746259B - Float-controlled valve device

Info

Publication number: CN101746259B
Application number: CN200910247025.0A
Authority: CN
Inventors: 古谷仁
Original assignee: Piolax Inc
Current assignee: Piolax Inc
Priority date: 2008-12-15
Filing date: 2009-12-15
Publication date: 2014-03-12
Anticipated expiration: 2029-12-15
Also published as: CN101746259A; JP2010137818A; JP5123837B2

Abstract

The present invention provides a float-controlled valve device capable of preventing the intrusion of fuel foam and the like into a through hole on the side wall of the shell of the device and keeping the through hole opened, comprising: a shell (5) which is provided with a floater chamber (R1) and a ventilating chamber (R2) through a separator wall (12), wherein a bottom cover (30) is mounted at the opening of the lower portion of the shell; a float-controlled valve (50); and a communicating opening (13) which forms a valve base (13a) contacted with/separated from the float-controlled valve (50); wherein a through hole (20) is formed on the side wall (11) of the shell (5) to communicate the floater chamber (R1) with a fuel tank; a blocking wall (35), which is formed on the bottom cover (30) and upwards extends from the periphery of the bottom cover (30), is a given interval away from the side wall (11) and disposed on the outer side of the through hole (20); and a support sheet (25) is formed on the side wall (11) of the shell (5) and erects from above the through hole (20) to support the front end portion of the blocking wall (35).

Description

Float-controlled valve device

Technical field

The present invention relates to the float-controlled valve device of shutoff valve in a kind of Fuel Tank that is applicable to be arranged on automobile etc. etc.

Background technology

In the Fuel Tank of automobile, be provided with shutoff valve (also referred to as upset safety protective valve (roll-over valve)); it is for discharging fuel vapour to filtering tank (canister); and; in running car, produce and rock more greatly or during automobile roll, the opening closure being communicated with filtering tank to be prevented to fuel leaks to outside.

As existing shutoff valve, for example use a kind of shutoff valve as described below, it has: housing, its via partition wall below arrange and to be communicated to the float bowl in Fuel Tank, arrange up and the outside breather chamber being communicated with of Fuel Tank, bottom (lowercap) is installed in lower opening portion; Float valve, it can be configured in to oscilaltion in described float bowl; And connected entrance, it is formed on described partition wall, to be communicated with described float bowl and described breather chamber, forms with described float valve contact/separated valve seat on its lower surface periphery, on the sidewall of described housing, form through hole, for being communicated with in described float bowl and described Fuel Tank.

But for above-mentioned shutoff valve, in the situation that automobile is turned etc. and to be made the fuel shaking amplitude in Fuel Tank larger, likely fuel enters fiercely from through hole, form the spittle etc. and invade breather chamber side by connected entrance.And the fuel entering likely flows to filtering tank side due to the difference of pressure inside and outside Fuel Tank, become a reason of fuel leakage.

Various technology of invading to breather chamber side for suppressing to become the fuel of above-mentioned fuel leakage reason have been proposed.For example, in following patent documentation 1, a kind of shutoff valve is disclosed, it is configured to, float valve housing (cover body) is accommodated in setting, in the situation that rising to, the pasta in Fuel Tank is more than or equal to the rising of specified amount float valve, valve seat opening port blocking is stoped the fuel in Fuel Tank flow out, and, near the upper end of described housing sidewall, run through and form through hole (discharge orifice), in addition, from the upper inside surface of described housing, with respect to housing sidewall, keep specified gap and barrier (shear wave defence wall) is vertically set, this barrier extends on the lower position of the outer openings portion that is positioned at described through hole.

Patent documentation: No. 3337739 communique of Japan's patent

Summary of the invention

Barrier in above-mentioned patent documentation 1, due to the top link of its upper end and housing, lower end becomes free end, opening between week and the sidewall periphery of housing in the lower end of barrier, so exist the fuel spittle to enter and invade through hole from this lower opening portion, enter the situation in housing.

Thus, the object of the present invention is to provide a kind of float-controlled valve device, it can prevent that fuel from entering fiercely from the through hole of housing sidewall more effectively, can suppress fuel spittle etc. and invade breather chamber side by connected entrance.

To achieve these goals, the 1st mode of the present invention provides a kind of float-controlled valve device, it is characterized in that having:

Housing, it is via partition wall, below arrange and be communicated to the float bowl in Fuel Tank, arrange up and the outside breather chamber being communicated with of Fuel Tank, in lower opening portion, locate to be provided with bottom;

Float valve, it can be configured in to oscilaltion in described float bowl; And

Connected entrance, it is formed on described partition wall, and to be communicated with described float bowl and described breather chamber, its lower surface periphery forms with described float valve and contacts/separated valve seat,

On the sidewall of described housing, form through hole, it is communicated with in described float bowl and described Fuel Tank,

On described bottom, form barrier, its periphery from bottom is extended upward, and between described sidewall, keeps specified gap and be configured in the outside of described through hole,

On the sidewall of described housing, be formed with supporting blade, its top from described through hole erects, and supports the leading section of described barrier.

According to foregoing invention, if the level of fuel in Fuel Tank surpasses specified altitude, by fuel, flow into the buoyancy producing in float bowl, make float valve increase, with be formed on valve seat butt on partition wall and inaccessible peristome, thereby can prevent that fuel from flowing into vent chamber by connected entrance.

In addition, because the through hole outside being formed in housing sidewall is formed with barrier across specified gap, even so because vehicle rocks or turns, make the fuel in Fuel Tank rock and collide with sidewall, also can utilize barrier and prevent fuel and through hole direct impact, can prevent that fuel from entering in float bowl fiercely from through hole, thereby form the fuel spittle and invade breather chamber side from the connected entrance being arranged on partition wall.

In addition, because barrier extends upward from the periphery of bottom, be configured in the outside of through hole, so the below of through hole is also blocked wall and covers, therefore, even by vehicle rock or turning etc. rocks fuel and from below, splashes the fuel spittle, also can prevent that the fuel spittle fuel from entering in through hole.

In addition, because supporting blade erects from the top of through hole, so valve gear tilts being accompanied by vehicle roll, valve gear top approaches in the situation that amplitude that level of fuel or fuel teetertotters is larger etc., also can prevent that fuel from invading from through hole top.

In addition, the supporting blade being formed on the sidewall of housing due to the leading section of barrier supports, so can prevent that barrier bending from damaging.

The 2nd mode of the present invention is to provide a kind of float-controlled valve device, and it,, in described the 1st invention, forms chimeric slit or the recess wherein of leading section that makes described barrier on described supporting blade.

According to foregoing invention, because the leading section of barrier is entrenched in the slit or recess being formed on supporting blade, so can prevent reliably that barrier from lodging to the inside or bending laterally, keep reliably the gap between barrier and through hole.Thus, can avoid following problems, that is, barrier lodges and in the side wall side of housing, the through hole of housing sidewall is blocked.

The 3rd mode of the present invention provides a kind of float-controlled valve device, it is in the described the 1st or the 2nd invention, described supporting blade is cap shape from the sidewall protrusion of described housing, its front end bends downwards and forms cover plate wall, between this cover plate wall and described sidewall, keep specified gap, and cover the outside of described through hole and extend, a side of this cover plate wall and described sidewall link, opposite side opening.

According to foregoing invention, by protrusion, be the part of cap shape, the cover plate wall that extend in the outside of covering through hole and the link wall that covers cover plate wall one side, can improve the rigidity of barrier and guarantee the sidewall of housing and the space between barrier, and effectively prevent that fuel from entering fiercely from through hole.

In addition, due to sidewall, by linking wall, one side of connection cover wooden partition, so can improve its rigidity, can support the leading section of barrier reliably.In addition, due to the opposite side opening of cover plate wall, so can make air or fuel be easy to pass through via through hole.

The 4th mode of the present invention provides a kind of float-controlled valve device, it is in described the 3rd invention, being positioned on the position below cover plate wall of described sidewall, in the both sides of described barrier, flange is vertically set, this flange covers the gap between described barrier and the sidewall of described housing.

According to foregoing invention, because the both sides at barrier are vertically provided with flange, to cover the gap between barrier and the sidewall of housing, so the spittle of fuel etc. are difficult to invade through hole from the both sides of barrier.

The 5th mode of the present invention provides a kind of float-controlled valve device, in the invention of its any one in described 1st～4, the lower, outer perimeter tight joint of the base end part of described barrier and the sidewall of described housing, the part that is positioned at described through hole outside of this barrier has specified gap with respect to the sidewall of described housing.

According to foregoing invention, lower, outer perimeter tight joint due to the base end part of barrier and the sidewall of housing, so can securely bottom be arranged on housing, and, by making to be positioned at the part in through hole outside, with respect to sidewall, there is specified gap, and can guarantee that fuel or air are via the turnover of through hole.

The 6th mode of the present invention provides a kind of float-controlled valve device, and it in the sidewall periphery of described housing, forms internal diameter direction to housing with the recessed depressed part of prescribed depth in described 1st～5 in any one invention, forms described through hole on this depressed part.

According to foregoing invention, due to the internal side diameter skew that can make the formation position of through hole to housing, so on one side can keep the gap between barrier and through hole, Yi Bian barrier is formed near the internal diameter of housing, can realize the densification of barrier.In addition, because through hole is formed on the depressed part obtaining with prescribed depth depression, so can make the fuel spittle or fuel further be difficult to enter in through hole.

The effect of invention

According to the present invention, because the through hole outside in housing sidewall forms barrier, and the below of through hole is also blocked wall and covers, so even if fuel rocks and splashes the spittle from below, also can prevent that the spittle from entering in through hole.And, due to supported support of leading section of barrier, so can prevent barrier bending.

Accompanying drawing explanation

Fig. 1 means the exploded perspective view of an embodiment of float-controlled valve device of the present invention.

Fig. 2 be this float-controlled valve device want portion's amplification oblique drawing.

Fig. 3 is the amplification oblique drawing that forms the bottom of this float-controlled valve device.

Fig. 4 is the section-drawing of this float-controlled valve device.

Fig. 5 is section-drawing this float-controlled valve device and cutting plane Fig. 4 quadrature.

Fig. 6 means that this float-controlled valve device is on the cutting plane identical with Fig. 5, the section-drawing of the state after float valve rises to greatest extent.

Fig. 7 is that the VII-VII of Fig. 5 vows the section-drawing shown in sight line.

Fig. 8 means the section-drawing of other embodiment of float-controlled valve device of the present invention.

Fig. 9 be this float-controlled valve device want portion's amplification oblique drawing.

The specific embodiment

Below, with reference to Fig. 1～7, for embodiment float-controlled valve device of the present invention being applied in shutoff valve, describe.

As shown in Figure 1, this float-controlled valve device 1 (hereinafter referred to as " valve gear 1 ") has housing 5, and this housing 5 has: housing body 10; Bottom 30, it is arranged on the lower opening portion place of this shell main body 10; And top cover 40, it is arranged on the top of shell main body 10.

As shown in Figure 4,5, the inner space being surrounded by housing body 10 and bottom 30, becomes the float bowl R1 that can configure to oscilaltion aftermentioned float valve 50, and the inner space being surrounded by housing body 10 and top cover 40 forms breather chamber R2.Described float bowl R1 is communicated in Fuel Tank, and described breather chamber R2 is communicated with the stream that arrives the filtering tank that is disposed at Fuel Tank outside.For each structure member, describe below.

As shown in Fig. 1,4,5, housing body 10 has the partition wall 12 of the sidewall cylindraceous 11 of lower opening and the upper surface of inaccessible housing body 10, in the central authorities of this partition wall 12, run through and form connected entrance 13, this connected entrance is communicated with described float bowl R1 and breather chamber R2.In addition, the lower surface periphery of described connected entrance 13 is set to cylindricly so that specified altitude is outstanding, forms the valve seat 13a with valve head 51 contacts of float valve 50 described later/separated.

On a position of the periphery of housing body 10, be provided with the valve body resettlement section 15 of case shape.On the diapire of this valve body resettlement section 15, be formed with ball valve V contact/separated peristome 15a (with reference to Fig. 4).In this valve body resettlement section 15, accommodate ball valve V, and accommodate the 1st preloading spring S1, its by ball valve V to peristome 15a side pretension, while making peristome 15a flat by obturation.In addition, in valve body resettlement section 15, connection pipe 16 is communicated with and forms with the inner space of valve body resettlement section 15, and the pipe arrangement that this connection pipe 16 is connected for the filtering tank with not shown is connected.In addition, the pressure rise in Fuel Tank is when being more than or equal to specified value, and the predetermincd tension of described ball valve V opposing the 1st preloading spring S1 and leave peristome 15a, realizes the function that fuel vapour is discharged outside Fuel Tank.

Above the upper surface of the partition wall 12 of housing body 10 and described valve body resettlement section 15, protrude the lid installation portion 17 that is provided with frame shape.Top cover 40 is installed at upper opening portion place at this lid installation portion 17.In addition, in a side contrary with described connection pipe 16 of lid installation portion 17, extend support snap-latch piece 18 is set, from the front end below of support snap-latch piece, protrude the engagement pawl 18a arranging and engage with the lateral border of the support B shown in Fig. 1, via this support B, valve gear 1 is arranged on Fuel Tank T.

In addition, below the sidewall 11 of housing body 10, along circumferentially protruding a plurality of snap fit tabs 19 are set, they engage with the connecting hole 37a (aftermentioned) of bottom 30.

As shown in Fig. 2 and Fig. 5～Fig. 7, on the sidewall 11 of this housing body 10, form through hole 20, it is communicated with in described float bowl R1 and Fuel Tank.In the present embodiment, on sidewall 11 cylindraceous 2 positions relative along Zhou Fangxiang, forming a plurality of manholes 20 with the position of described connection pipe 16 and support snap-latch piece 18 quadratures.

As shown in Figure 2, through hole 20 on 2 above-mentioned relative positions of sidewall 11 with left and right 2 row and be arranged above and below and form, there is through hole 20a, the 20a of topmost and arrange through hole 20b thereunder, on each position of above-mentioned 2 relative positions of sidewall 11, arrange respectively and amount to 6 through holes.

In addition, on the sidewall 11 of housing body 10, be formed with supporting blade 25, it supports the barrier 35 of bottom 30 described later.As shown in Figure 2, this supporting blade 25 has cap shape lug 26 and cover plate wall 27, this cap shape lug 26 is cap shape from the outer peripheral face protrusion that is positioned at top through hole 20a top of sidewall 11, this cover plate wall 27 bends downwards from the front end of this cap shape lug 26, and sidewall 11 between cover top through hole 20a and extend when keeping specified gap.

The cap shape lug 26 of present embodiment vertically arranges to external diameter direction from the outer peripheral face of sidewall 11, along the circumferential width of sidewall 11, forms the top through hole 20a of covering pair of right and left, the size of 20a.In addition, described cover plate wall 27, with the width identical with cap shape lug 26, bends with respect to these cap shape lug 26 quadratures, extends downwards, and between sidewall 11, forms the gap of fixed width.

In addition, as shown in Figure 1, on cap shape lug 26, along its Width, be formed through slit 26a, it engages with the leading section of barrier 35.In addition, this slit 26a starts from the lower surface of cap shape lug 26 recess forming with prescribed depth, as long as can be chimeric with the leading section of barrier 35.In addition, a side 27a of described cover plate wall 27 and described sidewall 11 link and inaccessible, and opposite side 27b does not link and opening (with reference to Fig. 2,7) with sidewall 11.In addition, on cover plate wall 27, on the position corresponding with being arranged on a pair of top through

hole

20a, 20a on sidewall 11, form pair of

holes

27c, 27c.

The leading section of barrier 35 is entrenched in (with reference to Fig. 5,6) in the slit 26a being formed on cap shape lug 26.Associated with it, described sidewall 11 be positioned at cover plate wall 27 below, along the circumferential both sides of the sidewall 11 of barrier 35,

flange

28,28 is vertically set respectively, their cover the gap between barrier 35 and the sidewall 11 of housing body 10.

Flange

28,28 in present embodiment forms, and is positioned on the position apart from the Width both sides specified gap of barrier 35, and it highly covers each a pair of 2 groups of lower through-hole 20b of configuration up and down of left and right.

Be arranged on the bottom 30 at the lower opening portion place of the housing body 10 that forms above-mentioned structure, there is circular base plate 31, this base plate 31 be formed with can make that fuel passes through see through hole 31a, from the central authorities of this base plate 31, protrude and be provided with spring supporting projection 33, its end to the 2nd preloading spring S2 is supported.

And, on base plate 31, forming barrier 35, its outer peripheral edges from base plate are extended upward, and keep specified gap between described sidewall 11, are configured in the outside of a plurality of through holes 20.In the present embodiment, a pair of

barrier

35,35 outer peripheral edges from base plate 31 are extended upward in the relative position that makes progress in week.

Each barrier 35 has: base end part 35a, the lower, outer perimeter tight joint of the sidewall 11 of itself and described housing body 10; And extension 35b, its from the upper end periphery of this base end part 35a, while guarantee and sidewall 11 between specified gap extend upward, become the part in the outside that is positioned at described through hole 20.The axis parallel ground of this extension 35b and housing body 10 extends upward, and keeps certain interval between described sidewall 11.The leading section of this extension 35b is entrenched in the slit 26a of described supporting blade 25, and makes barrier 35 supported.

In addition, in the outer peripheral edges of base plate 31, between described a pair of

barrier

35,35, be vertically provided with a plurality of engaging walls 37, they cover in the lower, outer perimeter of sidewall 11 of housing body 10, and have the connecting hole 37a engaging with described snap fit tabs 19.

In described float bowl R1, the float valve 50 of being accommodated slidably forms substantial cylindrical shape, surface central authorities protrude contact/separated valve head 51 are set with described valve seat 13a from it, in the periphery of float valve 50, form a plurality of on the guiding rib 52 of downward-extension, the interior all moving contacts of sidewall 11 of they and housing body 10, lead to the sliding action of float valve 50.

And described float valve 50 is as described below to be configured in float bowl R1.That is,, under the state of the set interior insertion of recess 53 the 2nd preloading spring S2 of the bottom center of float valve 50, float valve 50 is inserted in the float bowl R1 of housing body 10.

Then, an end of the 2nd preloading spring S2 is supported by spring supporting projection 33, the lower opening portion by bottom 30 to housing body 10 is pressed into.Then, the engaged wall 37 of lower, outer perimeter of the sidewall 11 of housing body 10 is covered, and the base end part 35a tight joint with barrier 35, the snap fit tabs 19 of housing body 10 and the connecting hole 37a of bottom 30 are engaged, and the leading section of barrier 35 is entrenched in the slit 26a of cap shape lug 26 (with reference to Fig. 5,6).Its result, barrier 35 is the state setting across specified gap with the outside with sidewall 11, by its extension 35b, covered the outside of a plurality of through

hole

20a, 20b, and, the base end part 35a of the periphery tight joint of utilization and sidewall 11, under state below covering through hole 20, bottom 30 is arranged on to the lower opening portion place (with reference to Fig. 2,5,6) of housing body 10.

As mentioned above, due to the lower, outer perimeter tight joint of the base end part 35a of the barrier 35 in present embodiment and the sidewall 11 of housing body 10, so can securely bottom 30 be arranged in housing body 10.

In addition, because the leading section of barrier 35 is entrenched in the slit 26a forming on supporting blade 25, so can prevent reliably barrier 35 (near the direction of the sidewall 11 of housing body 10) lodging to the inside or (away from the direction of the sidewall 11 of housing body 10) bending laterally, keep reliably the gap between barrier 35 and through hole 20.

In addition, owing to forming the cover plate wall 27 of the supporting blade 25 that the leading section of barrier 35 is supported, the sidewall 11 of one side and housing body 10 links (with reference to Fig. 2,7), so can improve the rigidity of supporting blade 25, can support reliably the leading section of barrier 35.

In addition, for barrier 35, because the lower, outer perimeter of the sidewall 11 of its base end part 35a and housing body 10 is combined closely and supported, and supported 25 of leading section supports, so the both ends of barrier 35 are all supported, can prevent reliably that barrier 35 from bending laterally or the distortion of lodging to the inside etc. or deflection etc., can guarantee reliably the gap between barrier 35 and through hole 20.

As mentioned above, by bottom 30 is installed in housing body 10, and float valve 50 is accommodated slidably, be configured in float bowl R1, and between float valve 50 and the base plate 31 of bottom 30, the 2nd preloading spring S2 be installed.Float valve 50, under the state not being immersed in fuel, compresses the 2nd preloading spring S2 by deadweight, and is positioned on base plate 31.In addition, make fuel increase due to vehicle roll etc., when float valve 50 is immersed in fuel, the 2nd preloading spring S2 applies predetermincd tension upwards to float valve 50 together with the buoyancy that float valve 50 is produced.

Below, the action effect of this valve gear 1 is described.

By being welded in the lateral border of the support B on Fuel Tank T, engage with the engagement pawl 18a of support snap-latch piece 18, thereby it is upper that valve gear 1 is arranged on to support B, valve gear 1 is arranged on to the inside of Fuel Tank T.In addition, connecting pipings on the connection pipe 16 of valve gear 1, this pipe arrangement links with the outside not shown filtering tank that is configured in Fuel Tank T.

In addition, at vehicle, do not rock, the liquid level of the fuel in Fuel Tank does not tilt, float valve 50 is not impregnated under the state in fuel, by deadweight compression the 2nd preloading spring S2 of float valve 50, the valve head 51 of float valve 50 is separated with valve seat 31a, and connected entrance 13 is opened (with reference to Fig. 4,5).

Under above-mentioned state, if vehicle turns to or inclination amplitude compared with large and make the liquid level of fuel F increase, float valve 50 is immersed in the fuel that is more than or equal to specified altitude, to float valve 50 effect buoyancy, and by the predetermincd tension of the 2nd preloading spring S2, float valve 50 floats, and as shown in Figure 6, valve head 51 is with valve seat 13a butt and inaccessible connected entrance 13.Its result, the situation that fuel flows in breather chamber R2 by connected entrance 13 is prevented from, and can prevent reliably that fuel from leaking to the outside of Fuel Tank T.

In addition, at Vehicle Driving Cycle in rough road and up-down vibration or double swerve, or the in the situation that of sharply turning, fuel F in Fuel Tank T rocks or from level of fuel, splashes small spittle shape fuel spittle Fa etc. as shown in Figure 5, and these likely collide on the sidewall 11 of housing body 10.

On the other hand, due in this valve gear 1, be formed at a plurality of through hole 20a on the sidewall 11 of housing body 10, the outside of 20b, across specified gap, form barrier 35, so as shown in Figure 5, even if the fuel F rocking or fuel spittle Fa collision, on the sidewall 11 of housing body 10, also can prevent that their direct impacts are on a plurality of through hole 20a, 20b.Its result, can prevent that fuel from entering in float bowl R1 fiercely from a plurality of through

hole

20a, 20b, from the connected entrance 13 being arranged on partition wall 12, enters breather chamber R2 side.

In addition, due to barrier 35, be arranged on as mentioned above the below of housing body 10, from the periphery of bottom 30, extend upward, be configured in the outside of a plurality of through

hole

20a, 20b, so the below of a plurality of through

hole

20a, 20b is also blocked wall 35 and covers, therefore, even because rocking or turning to etc. of vehicle makes fuel F rock and splash fuel spittle Fa from below, also can prevent that it from entering in a plurality of through

hole

20a, 20b.

In addition, in the present embodiment, because cap shape lug 26 erects and covers this top through hole 20a from the top of top through hole 20a, even the fuel F amplitude that teetertotters is larger so be accompanied by vehicle roll, thereby fuel is fallen from the top of cap shape lug 26, also can prevent that fuel F from directly invading in through

hole

20a, 20b fiercely.

In addition, the supporting blade 25 being formed on the sidewall 11 of housing body 10 due to the leading section of barrier 35 supports, so can prevent that barrier 35 from bending laterally.Its result, can suppress barrier 35 and damage and prevent that through hole 20 from exposing, and can prevent that the fuel spittle Fa etc. from invading from through hole 20.In addition, owing to also can preventing that barrier 35 from lodging to the inside, so guarantee the gap between barrier 35 and the sidewall 11 of housing body 10, keep the state that through hole 20 is opening.Its result, can keep through hole 20 for the state of opening, as shown in the arrow of Fig. 7, can make reliably through hole 20 as being worked in the liquid fuel F discharge in inflow float bowl R1 and the gangway of fuel vapour or air etc.

And the supporting blade 25 of present embodiment, by cap shape lug 26 and the cover plate wall 27 that covers the outside of through hole 20, can prevent that fuel F and the fuel spittle Fa from entering in the float bowl R1 of housing body 10 from through hole 20.In addition, due to a side 27a of described

cover plate wall

27 and 11 links of the sidewall of housing body 10, opposite side 27b opening, so as shown in Figure 7, can guarantee reliably the gangway of fuel and air, can make fuel, fuel vapour or air be easy to pass through via through hole 20.

In addition, in the present embodiment, below the described cover plate wall 27 of the sidewall 11 of housing body 10, and be vertically provided with

flange

28,28 in the Width both sides of barrier 35, cover the gap between barrier 35 and the sidewall 11 of housing body 10, so can make fuel F and fuel spittle Fa be difficult to invade through hole 20 from the both sides of barrier 35.

But, at the liquid level of fuel F, rise and utilize under the state of the inaccessible connected entrance 13 of float valve 50, the situation that also exists the pressure in Fuel Tank T to raise.In this case, due to the predetermincd tension of ball valve V opposing the 1st preloading spring S1 that usually makes the peristome 15a of valve body resettlement section 15 close, slide upward, peristome 15a is opened, fuel vapo(u)r is discharged outside Fuel Tank, so the pressure in Fuel Tank is remained to specified value.

And the valve gear 1 that forms above-mentioned structure sometimes fits together and is configured in Fuel Tank with Fuel Tank anti-overflow valve.; in Fuel Tank; except the valve gear 1 working as shutoff valve; also configure Fuel Tank anti-overflow valve; if level of fuel reach a certain height when refueling; Fuel Tank anti-overflow valve is closed, and fuel is recycled to the assigned position place of fuel filler pipe, and the supply of fuel is stopped by not shown bend pipe (bent tube).

And, electrolyte level when setting valve gear 1 (shutoff valve) cuts out, the electrolyte level while closing than Fuel Tank anti-overflow valve exceeds predetermined distance, to prevent that valve gear 1 (shutoff valve) cuts out before Fuel Tank anti-overflow valve is closed.That is, at Fuel Tank anti-overflow valve, close and before stopping refueling, need to maintain the state of fuel vapour or Bas Discharged that can make by the float bowl R1 of housing 5, that is, maintaining through hole 20 for the state of opening.

Corresponding with above-mentioned requirements, in valve gear involved in the present invention 1, can guarantee as mentioned above the gap between barrier 35 and the sidewall 11 of housing 5, keep the state that through hole 20 is opening.

Other embodiment of float-controlled valve device of the present invention has been shown in Fig. 8,9.In addition, for the part mark same numeral substantially identical with above-mentioned embodiment, the description thereof will be omitted.

The float-controlled valve device 1a of present embodiment (hereinafter referred to as " valve gear 1a "), in the periphery of sidewall 11 of housing body 10 that forms housing 5, formation with the recessed depressed part 11a of prescribed depth, forms described through hole 20 in the bottom of this depressed part 11a to the internal diameter direction of housing body 10.11a is corresponding with this depressed part, in the interior week of sidewall 11 of housing body 10, and forming on the position of depressed part 11a, forms the shape of protruding with specified altitude to internal diameter direction.

According to above-mentioned embodiment, because the formation position of through hole 20 is compared with described embodiment, can be to the internal side diameter skew of housing body 10, so can keep the gap between barrier 35 and through hole 20 on one side, make the extension 35b of barrier 35 near the internal diameter formation of housing body 10 on one side, its result, can realize the densification of barrier 35.In addition, because through hole 20 is formed on the bottom with the recessed depressed part 11a of prescribed depth, so can make fuel spittle Fa and fuel further be difficult to enter in through hole 20.

Claims

1. a float-controlled valve device, is characterized in that, has:

On described bottom, form barrier, this barrier extends upward from the periphery of bottom, and between described sidewall, keeps the gap of regulation and be configured in the outside of described through hole,

On the sidewall of described housing, be formed with supporting blade, its top from described through hole erects, and supports the leading section of described barrier,

On described supporting blade, form chimeric slit or the recess wherein of leading section that makes described barrier.

2. a float-controlled valve device, is characterized in that, has:

Described supporting blade is cap shape from the sidewall protrusion of described housing, its front end bends downwards and forms cover plate wall, keeps specified gap between this cover plate wall and described sidewall, and covers the outside of described through hole and extend, one side of this cover plate wall and described sidewall link, opposite side opening.

3. float-controlled valve device as claimed in claim 2, is characterized in that,

Being positioned on the position below cover plate wall of described sidewall, in the both sides of described barrier, flange is vertically set, this flange covers the gap between described barrier and the sidewall of described housing.

4. a float-controlled valve device, is characterized in that, has:

In the sidewall periphery of described housing, form internal diameter direction to housing with the recessed depressed part of prescribed depth, on this depressed part, form described through hole.

5. the float-controlled valve device as described in any one in claim 1 to 4, is characterized in that,

The lower, outer perimeter tight joint of the base end part of described barrier and the sidewall of described housing, the part that is positioned at described through hole outside of this barrier has specified gap with respect to the sidewall of described housing.