CN201778918U - Activated carbon tank one-way valve - Google Patents

Abstract

An activated carbon tank one-way valve comprises a valve body, a spring and a ball. The valve body is a cylinder with an axial through cavity; a ball seat is formed at one end of the valve body; a central through hole is arranged on the ball seat; a spring seat is arranged at the other end of the valve body; a spring seat central through hole for airflow to pass through is arranged on the spring seat; one end of the spring is connected with the spring seat; the other end of the spring is abutted to the ball positioned inside the through cavity of the valve body; the ball can be in contact seal with one end of the central through hole of the ball seat; one groove or a plurality of grooves extending towards one end of the spring seat along the axial direction of the valve body are arranged on the inner wall of the through cavity of the valve body in a surrounding manner; and the distance from one end of each groove close to the ball seat to the nearest end face of the ball seat is smaller than or equal to the distance from the center of the ball to the nearest end face of the ball seat. The grooves expand cross sectional area for the airflow to pass through and can adjust pressure inside a gasoline tank to be balanced timely, rapidly and effectively.

Description

A kind of charcoal canister one-way valve

Technical field

The utility model relates to a kind of activated carbon canister one-way valve.

Background technique

As everyone knows, gasoline has the characteristic that is easy to volatilize, especially in ambient temperature than under the condition with higher.So in present automotive oil tank, often the gas spirit that volatilizees abrim if gas spirit is too much, will cause the air pressure in the petrol tank excessive, excessive air pressure can bring serious threat to fuel tank, and the possibility of bursting the fuel tank weld seam is arranged.In order to prevent that gas spirit too much causes the excessive safety to petrol tank of air pressure in the petrol tank to threaten in the petrol tank, generally be to adopt specific pipeline that the gas spirit in the petrol tank is drawn and is stored in the activated carbon canister.Certainly draw gas spirit and be air pressure in fuel tank and reach under the situation of a numerical value of setting and just can carry out, when less than this numerical value, just can not draw the gas spirit in the fuel tank.

The general mobility status that adopts one-way valve to control the gas spirit in the fuel tank in the reality, one-way valve is installed in the pipeline of connecting petrol tank and activated carbon canister.As shown in Figure 1, vertical profile schematic representation for a kind of one-way valve of available technology adopting, this one-way valve comprises the cylinder valve body 31 with an axial cavity 34, valve body 31 1 ends are provided with spheroid seat 35, the other end is provided with spring seat 36, spheroid 33 place on the spheroid seat 35 respectively with spring 32 and spring seat 36 on, and spring 32 1 ends are resisted against on the spheroid 33, the through hole 351 that spheroid seat 35 is provided with location spheroid 33 and allows air communication cross also is provided with the through hole 361 that air feed stream passes through on the spring seat 36.As shown in Figure 2, be the activated carbon canister 39 that adopts above-mentioned one-way valve, when the air pressure in the petrol tank during greater than the spring force sum of air pressure in the activated carbon canister 39 and one-way valve 311, spring in this one-way valve 311 is compressed, and the spheroid in this one-way valve 311 moves down, thereby utilize through hole and the through hole on the spring seat on the spheroid seat of this one-way valve 311 to connect fuel tank inner chamber and activated carbon canister inner chamber 391, make gas in the fuel tank escape in the activated carbon canister 39 and absorbed by the active carbon in the activated carbon canister; Another same one-way valve 312 also is housed on activated carbon canister 39, its effect is, when the air pressure in the petrol tank too small and when forming negative pressure, thereby the spheroid in the pushing of the air pressure in the activated carbon canister 39 one-way valve 312 compresses this one-way valve 312 medi-springs, open one-way valve 312, and then make atmosphere enter the pressure that replenishes in the petrol tank in the petrol tank, the pressure in the petrol tank is remained in the normal scope.Generally speaking, above-mentioned one-way valve satisfies usage requirement substantially, but because spheroid 33 is close on the inwall of cavity 34 of valve body 31, distance between the inwall of the cavity 34 of its spheroid 33 and valve body 31 is too little, it is very little to leave the cross-section area that gas passes through for, when the pressure in the fuel tank increases very fast (perhaps the pressure in the fuel tank reduces too fast), gas in the petrol tank just can not be discharged to (perhaps the atmosphere in the activated carbon canister can not in time replenish the air pressure in the petrol tank) in the activated carbon canister timely, and the air pressure in the assurance petrol tank that can not be very fast returns in the normal scope, thereby the safety of oil dropping apparatus structure is brought threat.There also have contrast to make to be improved, as increasing the diameter of valve body cavity, perhaps reduce the diameter of spheroid, thereby increase the cross-section area that air feed stream passes through, but the problem of bringing thus is poorly sealed.Be badly in need of a kind of cross-section area that can guarantee that enough air feed stream passes through thus, and the activated carbon canister one-way valve with excellent sealing performance.

Summary of the invention

The utility model is less for one-way valve air flow stream flux in the activated carbon canister in the solution prior art, can not in time carry out the problem of air pressure balance, a kind of activated carbon canister one-way valve is provided, under the prerequisite that guarantees activated carbon canister one-way valve sealability, the cross-section area that air feed stream passes through in the one-way valve when being increased in one-way valve opens.

The technological scheme that the utility model adopted is, a kind of activated carbon canister one-way valve, comprise valve body, spring, spheroid, described valve body has axial cavity, valve body one end forms the spheroid seat, the spheroid seat is provided with spheroid seat central through bore, the valve body the other end is provided with spring seat, spring seat is provided with the spring seat central through bore that air feed stream passes through, spring one end is connected with spring seat, its the other end is resisted against on the spheroid, spheroid is positioned at the cavity of valve body and can forms contact seal with central through bore one end of spheroid seat, be provided with the one or more of grooves that axially extend and arrange around the cavity inwall to spring seat one end along valve body on the cavity inwall of valve body, described groove is less than or equal to the distance of the centre of sphere of spheroid to the nearest end face of spheroid seat near an end of spheroid seat to the distance of the nearest end face of spheroid seat.

Preferably, described groove is a spiral groove, and the end away from the spheroid seat of described groove extends to the end face of mounting spring seat one end of valve body always.

More electedly, the cross section of described groove is a circular arc, and the radius of curvature of described circular arc is less than the radius of curvature of described spheroid.

As further preferred version, the degree of depth of described groove is along with groove extends and increases gradually to spring seat one end.

The edge that described spheroid seat contacts with spheroid is formed with the straight line chamfering, forms the straight line chamfering at the edge that the spheroid seat contacts with spheroid, more helps the stability of the position of spheroid when its seal action, has also just guaranteed the stability of sealing.

Improve as another kind, the position that described spheroid seat contacts with spheroid is formed with the concave arc chamfering, and the radius of described concave arc equates with the radius of spheroid.

In the above technological scheme, by on valve body cavity wall, spiral groove being set, when spheroid is boosted by air pressure and is mobile, part air-flow passes through from spheroid and the original gap of valve body cavity wall, another part air-flow then passes through from groove, thereby groove has increased the cross-section area that air feed stream passes through, and makes air-flow pass through from the check valve body cavity faster, thereby has increased the cross-section area that air feed stream passes through under the situation that guarantees sealing; When the through hole end on groove and the spheroid seat fits tightly, then play seal action, can in time fast and effeciently regulate the pressure balance in the petrol tank.

Description of drawings

Fig. 1 is an activated carbon canister one-way valve vertical profile schematic representation commonly used in the prior art;

Fig. 2 is the vertical profile schematic representation that the activated carbon canister of activated carbon canister one-way valve shown in Figure 1 is housed;

Fig. 3 is a kind of embodiment's of the utility model activated carbon canister one-way valve a vertical profile schematic representation;

Fig. 4 is the A-A cross-sectional schematic among Fig. 3;

Fig. 5 is the activated carbon canister vertical profile schematic representation that activated carbon canister one-way valve shown in Figure 3 is housed;

Fig. 6 is second kind of embodiment's vertical profile of the utility model activated carbon canister one-way valve schematic representation;

Fig. 7 is the third embodiment's vertical profile schematic representation of the utility model activated carbon canister one-way valve;

Fig. 8 is the 4th kind of embodiment's vertical profile schematic representation of the utility model activated carbon canister one-way valve.

Embodiment

Clearer for technical problem, technological scheme and beneficial effect that the utility model is solved, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

As shown in Figure 3, vertical profile schematic representation for a kind of embodiment of the utility model activated carbon canister one-way valve, comprise valve body 1, spring 2, spheroid 3, the profile of valve body 1 is a cylindrical body, it has an axial cavity 4, one end of valve body 1 forms an end cap with spheroid seat central through bore 51, and this end cap is spheroid seat 5, and described spheroid seat 5 forms one with valve body 1; The other end of valve body 1 is provided with spring seat 6, spring seat 6 links to each other with valve body 1, spring seat 6 is provided with the spring seat central through bore 61 that air feed stream passes through, spring 2 and spheroid 3 all are positioned at the cavity 4 of valve body 1, when one-way valve is in sealing state for opening, spheroid 3 contacts with spheroid seat central through bore 51 1 ends of spheroid seat 5, and under the elastic force effect of spring 2, spheroid 3 and this end form and fit tightly and play a part sealing gas; Spring 2 one ends are connected with spring seat 6, spring 2 the other ends are resisted against on the spheroid 3,2 pairs of spheroids 3 of spring have the thrust of certain pretension, spheroid 3 is close on the end of spheroid seat central through bore 51 of spheroid seat 5, gas just can not be by the spheroid seat central through bore 51 on the spheroid seat 5 when spheroid 3 was close on the end of spheroid seat central through bore 51 of spheroid seat 5, and this moment, spheroid 3 just played a part sealing; On the inwall of the cavity 4 of valve body 1, be provided with vertically the one or more of spiral grooves 7 that extend and arrange around the cavity inwall to spring seat 6 one ends, this groove 7 extends around the spiral inner wall of cavity 4 to an end ring of valve body 1 mounting spring seat 6 from beginning near the end face somewhere of spheroid seat 5 always, wherein, the initial position of groove 7 is less than or equals the distance of the centre of sphere of spheroid 3 to spheroid seat 5 nearest end end faces to the distance of a nearest end end face of spheroid seat 5, and a nearest end face noted earlier is meant that end face that is positioned at cavity 4 of spheroid seat 5.

The purpose that groove 7 is set is the cross-section area for air feed stream circulation in the cavity 4 that increases valve body 1, and the initial position of groove 7 is less than or equals the distance of the centre of sphere of spheroid 3 to spheroid seat 5 nearest end end faces to the distance of a nearest end end face of spheroid seat 5, promptly when gas promotes spheroid 3 along the moving axially of valve body 1, gap between cavity 4 inwalls of spheroid 3 and valve body 1 does not change, but because the existence of groove 7, then groove 7 bottoms are to there being certain clearance to exist between cavity 4 inwalls of valve body 1, this part gap has increased the cross-section area that air feed stream passes through just, as shown in Figure 4, be the A-A sectional view among Fig. 3, can find out clearly that by figure set groove 7 has increased the cross-section area that air feed stream passes through between valve body and the spheroid.The shape of cross section of groove 7 can design according to actual needs, and as circular arc, triangle, rectangle etc., the cross section of groove 7 is subtriangular as shown in Figure 4.

Fig. 3 and one-way valve shown in Figure 4 are provided with a groove 7 on cavity 4 inwalls of valve body 1 and around the cavity inwall, the global shape of groove 7 is shape of threads or coil spring shape, certain described groove 7 also can be provided with many, and can play equally increases the effect that air communication is crossed cross-section area.For groove 7 valve body 1 axially on axial length, should consider according to the displacement distance of normal conditions lower sphere 3 and the structural strength of valve body 1, the end of groove 7 should surpass the highest distance position place that normal conditions lower sphere 3 moves to, the groove 7 of one-way valve shown in the accompanying drawing 3 has extended to the end of valve body 1 always, certainly is fine under the situation that the intensity of valve body 1 meets the demands; As shown in Figure 6, if the intensity of valve body 1 is less, the end that groove 7 then can be set gets final product in the highest distance position place or the more a little distance of spheroid motion, can deal with on the merits of each case according to actual conditions.Generally, the maximum distance of spheroid motion can not surpass 1/3rd length of valve body 1, so as long as the tail end of groove 7 surpasses valve body 1 apart from the distance of spheroid seat 1/3rd length are set.

As shown in Figure 7, vertical profile schematic representation for the another kind of embodiment of the utility model activated carbon canister one-way valve, spiral groove 7 shown in the figure is along with in width and depth increasing gradually on the direction of extending to spring seat 6 one ends, promptly as a kind of optimized technical scheme, described groove 7 is along being circular arc perpendicular to the cross section on these groove 7 directions, and the radius of curvature of described circular arc is less than the radius of curvature of described spheroid.Could guarantee that so described spheroid 3 can not fall in the groove 7, could make to have certain clearance constantly between groove and the spheroid 3.Along groove 7 on the direction that spring seat 6 one ends extend, the radius of curvature of described groove 7 slowly increases, but the maximum radius of curvature that can not surpass spheroid 3, be that groove 7 all is slowly to become big in width and depth, like this will be along with the increase of spheroid 3 mobile positions (promptly being pressed down the position), in the cavity 4 by valve body 1 cross-section area of air feed stream circulation also can slowly become big, so that the air-flow quantitative change of flowing through in valve body 1 cavity 4 is big, when the negative pressure in the fuel tank is excessive, gas in the activated carbon canister 9 also can enter in the fuel tank faster, thereby make the air pressure in the fuel tank return to normal range (NR) faster, better regulate the pressure balance in the petrol tank.

As shown in Figure 5, for the activated carbon canister vertical profile schematic representation of activated carbon canister one-way valve shown in Figure 3 is housed, wherein this activated carbon canister is equipped with two one- way valves 11,12, the structure of these two one- way valves 11,12 is consistent with the structure of one-way valve shown in Figure 3, thereby form two-way valve with two-way ventilatory function, wherein the one-way valve 11 on the left side is used for the inner chamber 91 of gas from activated carbon canister 9 is delivered in the fuel tank, and the one-way valve 12 on the right is used for gas is delivered in the fuel tank inner chamber 91 of activated carbon canister 9.When the gasoline of the volatilization in the fuel tank too much or other reasons and when causing that the fuel tank internal air pressure is excessive, gas in the fuel tank will be in pipeline 13 enters the upper chamber 14 of activated carbon canister 9, thereby the spheroid of pushing left side one-way valve 11, this spheroid is moved down, opened the through hole of left side one-way valve upper sphere seat, thereby the inner chamber 91 that has been communicated with fuel tank inner chamber and activated carbon canister 9, overvoltage gas in the fuel tank is just from pipeline 13, spheroid block hole through left side one-way valve, from the check valve body inner chamber of the left side, flow to the spring seat of left side one-way valve then in the gap of spheroid and valve body between the walls and the groove, after spring base hole and groove enter into the inner chamber 91 of activated carbon canister 9, from making the overvoltage gas in the fuel tank enter in the activated carbon canister 9, thereby reduced air pressure in the fuel tank; On the contrary, when being formed with negative pressure in the fuel tank, be that air pressure in the fuel tank is during less than the barometric pressure of external environment, gas in the activated carbon canister 9 just can promote the one-way valve 12 on the right, make the one-way valve 12 on the right open-minded, gas in the activated carbon canister 9 is entered in the fuel tank, guaranteed that the interior stable gas pressure of fuel tank is in normal scope.When the air pressure in the fuel tank was in the normal range (NR), left and right one- way valve 11,12 all was in the hermetically closing state, and at this moment, the spheroid of left and right one- way valve 11,12 all is close on separately the spheroid seat.

Fit mutually and seal in order better to make spheroid 3 and spheroid seat 5, as shown in Figure 8, the edge part that contacts with spheroid 3 on spheroid seat 5 is for being formed with chamfering 8, this chamfering can be general straight line chamfering, also can be to form the concave arc chamfering with concave arc, preferably select the radius of this concave arc to equate with the radius of spheroid 3, between this moment spheroid 3 and the spheroid seat 5 for face contacts, the best sealing state with regard to realizing between spheroid 3 and the spheroid seat 5 so.

The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.

Claims (7)

1. activated carbon canister one-way valve, comprise valve body (1), spring (2), spheroid (3), described valve body (1) has axial cavity (4), valve body (1) one end forms spheroid seat (5), spheroid seat (5) is provided with spheroid seat central through bore (51), valve body (1) the other end is provided with spring seat (6), spring seat (6) is provided with the spring seat central through bore (61) that air feed stream passes through, spring (2) one ends are connected with spring seat (6), its the other end is resisted against on the spheroid (3), spheroid (3) is positioned at the cavity (4) of valve body (1) and can forms contact seal with central through bore (51) one ends of spheroid seat (5), it is characterized in that, be provided with the one or more of grooves (7) that extend and arrange around the cavity inwall to spring seat (6) one ends on cavity (4) inwall of valve body (1), described groove (7) is less than or equal to the distance of the centre of sphere of spheroid (3) to the nearest end face of spheroid seat (5) near an end of spheroid seat to the distance of the nearest end face of spheroid seat (5).

2. activated carbon canister one-way valve according to claim 1 is characterized in that, described groove is a spiral groove.

3. activated carbon canister one-way valve according to claim 2 is characterized in that, described groove (7) extends to the end face of mounting spring seat (6) one ends of valve body (1) away from an end of spheroid seat.

4. according to claim 1 or 3 described activated carbon canister one-way valves, it is characterized in that the degree of depth of described groove (7) is along with groove (7) extends and increases gradually to spring seat (6) one ends.

5. activated carbon canister one-way valve according to claim 4 is characterized in that, the cross section of described groove (7) is a circular arc, and the radius of curvature of described circular arc is less than the radius of curvature of described spheroid.

6. according to claim 1 or 3 described activated carbon canister one-way valves, it is characterized in that the edge that described spheroid seat (5) contacts with spheroid (3) is formed with straight line chamfering (8).

7. according to claim 1 or 3 described activated carbon canister one-way valves, it is characterized in that described spheroid seat (5) is formed with the concave arc chamfering with the position that spheroid (3) contacts, the radius of described concave arc equates with the radius of spheroid (3).

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