CN216200939U

CN216200939U - Compact fuel tank safety valve

Info

Publication number: CN216200939U
Application number: CN202122673912.3U
Authority: CN
Inventors: 姜林; 高德俊; 吕昊; 朱凯; 苏卫东
Original assignee: Yapp Automotive Parts Co Ltd
Current assignee: Yapp Automotive Parts Co Ltd
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2022-04-05
Anticipated expiration: 2031-11-03

Abstract

The utility model discloses a compact fuel tank safety valve, which is mainly designed and conceived in the technical scheme that a current limiting function is integrated on the valve, specifically, a spring and a sliding block are arranged in a hollow boss on the inner surface of a valve flange, and a through hole at the upper end of the sliding block is smaller than an opening at the lower end and can move up and down in the vertical direction; the side wall of the boss is provided with a channel connecting hole communicated with the flange exhaust channel, and the mechanism has the function that when the slide block is positioned at a preset high position, the first through hole, the open structure, the second through hole and the channel connecting hole form a flow-limiting exhaust channel. The utility model has the characteristics of compact structure, low cost and high applicability, and adds the function of flow limiting and pressure relief on the exhaust channel of the fuel system, thereby effectively limiting the flow rate of fuel steam during high-pressure relief and further eliminating the negative influence of high-speed airflow on the fuel system and the environment.

Description

Compact fuel tank safety valve

Technical Field

The utility model relates to the field of vehicle fuel tanks, in particular to a compact fuel tank safety valve.

Background

Due to the increasing stringent emission legislation requirements, especially the emissions requirements of state 6 and LV ii/iii, the construction of fuel tank systems has become increasingly complex. In response to this, plug-in hybrid vehicles (PHEVs) are on the market with an increasing specific gravity. The PHEV vehicle type needs to be equipped with a high-pressure fuel system, which needs to lock fuel vapor in a fuel tank and release the pressure at a proper time, so that the control of the fuel vapor can be realized and the emission reduction target is achieved.

When the high-pressure fuel system carries out the pressure release under high pressure operating mode, can produce high-speed air current, high-speed air current probably produces following at least two aspects influence to the fuel system:

1. high velocity air flow past the tank vent valve may cause premature valve closure, a phenomenon known in the fuel tank industry as "cocking", which temporarily disables the venting capability of the fuel system.

2. Because the adsorption capacity of the carbon tank is reduced along with the increase of the oil vapor speed, when high-speed airflow passes through the carbon tank, the carbon tank can not be adsorbed in time, and fuel vapor is discharged into the atmosphere.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to a compact fuel tank safety valve to eliminate the negative impact of high velocity gas flow on the fuel system and environment.

The technical scheme adopted by the utility model is as follows:

a compact fuel tank safety valve comprises a valve flange and a valve shell which are connected with each other, wherein a hollow boss is arranged on the inner surface of the valve flange, and a sliding block is connected in the boss in a sliding manner;

the sliding block is of a hollow structure, the lower end of the sliding block is of an open structure, the open structure is communicated with a first through hole in an upper cover of the valve shell, a second through hole is formed in the middle of the upper end face of the sliding block, and the diameter of the second through hole is smaller than that of the open structure;

a spring is further arranged in the boss, and two ends of the spring are respectively connected with the inner surface of the valve flange and the upper end surface of the sliding block;

the side wall of the boss is provided with a channel connecting hole communicated with a flange exhaust channel;

when the sliding block is located at a preset high position, the first through hole, the open structure, the second through hole and the channel connecting hole form an exhaust channel.

In at least one possible implementation manner, the upper end of the first through hole is provided with an upper edge, and the upper edge is connected with the lower edge of the boss in a sealing mode.

In at least one possible implementation manner, a first groove is arranged inside the boss, and a plurality of sliding grooves are formed in the side wall of the first groove;

and an upright post matched with the sliding groove is formed on the top surface of the sliding block.

In at least one possible implementation manner, a limit block is arranged at the top end of the upright column, and the limit block is used for enabling the sliding block to move up and down in the first groove within a limited range.

In at least one possible implementation manner, a stop portion matched with the limiting block is arranged on the sliding groove and/or the channel connecting hole.

In at least one possible implementation manner, the inner diameter of the first groove is smaller than the outer diameter of the sliding block.

In at least one possible implementation manner, a second groove is formed inside the boss;

the second groove is arranged below the first groove and is in clearance fit with the sliding block;

when the sliding block is located at a preset low position, an exhaust channel is formed by the first through hole, the open structure, a gap between the second groove and the sliding block, the second through hole and the channel connecting hole.

In at least one possible implementation manner, a plurality of raised baffles are arranged on the inner wall of the second groove, and a preset interval is reserved between every two adjacent baffles.

In at least one possible implementation manner, the bottom edge of the second groove is the lower edge of the boss, and the wall thickness of the lower edge is smaller than that of the second groove.

In at least one possible implementation manner, the first groove and the second groove have a stepped structure therebetween.

The main design concept of the utility model is that the flow limiting function is integrated on the valve, specifically, a spring and a slide block are arranged in a hollow boss on the inner surface of a valve flange, and a through hole at the upper end of the slide block is smaller than an opening at the lower end and can move up and down in the vertical direction; the side wall of the boss is provided with a channel connecting hole communicated with the flange exhaust channel, and the mechanism has the function that when the slide block is positioned at a preset high position, the first through hole, the open structure, the second through hole and the channel connecting hole form a flow-limiting exhaust channel. The utility model has the characteristics of compact structure, low cost and high applicability, and adds the function of flow limiting and pressure relief on the exhaust channel of the fuel system, thereby effectively limiting the flow rate of fuel steam during high-pressure relief and further eliminating the negative influence of high-speed airflow on the fuel system and the environment.

Drawings

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, in which:

FIG. 1 is a cross-sectional view of a compact fuel tank relief valve provided by an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a valve flange provided in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view of a slider provided in an embodiment of the present invention;

FIG. 4 is a schematic view of a valve housing provided in accordance with an embodiment of the present invention;

FIG. 5 is a partial cross-sectional view of a compact fuel tank relief valve provided in accordance with an embodiment of the present invention in a low pressure relief condition;

FIG. 6 is a partial cross-sectional view of a compact fuel tank relief valve provided in accordance with an embodiment of the present invention in a high pressure relief condition.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the utility model.

The utility model provides an embodiment of a compact fuel tank safety valve, and particularly relates to a compact fuel tank safety valve which comprises a valve flange 1 and a valve housing 3 which are connected with each other as shown in figures 1-4, wherein in particular, the valve flange 1 and the valve housing 3 are connected through an O-shaped ring 2 as can be referred to the prior art. In practical operation, the cylindrical boss 101 may be formed in the middle of the inner surface of the valve flange 1, and of course, other shapes may also be provided.

The slider 8 is a hollow structure, the lower end of the slider 8 is an open structure, the open structure is communicated with a first through hole 303 on an upper cover 302 of the valve housing 3, a second through hole 801 is arranged in the middle of the upper end face of the slider 8, and the diameter of the second through hole 801 is smaller than that of the open structure.

A spring 7 is further arranged in the boss 101, and two ends of the spring 7 are respectively connected with the inner surface of the valve flange 1 and the upper end face of the sliding block 8.

The side wall of the boss 101 is provided with a channel connecting hole 102 communicated with a flange exhaust channel (exhaust bamboo joint channel).

When the slide block 8 presses the spring 7 upward under the action of pressure and is at a preset highest position, the passage connecting hole 102 is communicated with the second through hole 801.

Of course, it can also be pointed out that other components of the valve mentioned in the above embodiments can use the existing valve structure for reference, and referring to fig. 1, the valve housing 3 is connected with the base 6, the large spring 5 is arranged inside the base 6, the lower end of the large spring 5 is connected with the inner surface of the base 6, the upper end of the large spring 5 is connected with the inner surface of the float 4, the float 4 is arranged inside the valve housing 3, and can perform a limited up-down movement in the vertical direction inside the valve housing 3, and no further description or limitation is made herein.

Regarding the manner of sliding connection of the sliding block 8 in the boss 1, in practical operation, it may be considered to provide a first groove 106 inside the boss 101, and form a plurality of sliding slots 104 on the side wall of the first groove 106; correspondingly, a pillar 802 is formed on the top surface of the sliding block 8 to cooperate with the sliding groove 104, so as to realize the sliding connection between the two.

Therefore, in consideration of limiting the vertical movement range of the slider 8, a limit block 803 may be provided at the root of the upright 802, so that the slider 8 may move up and down vertically within the first groove 106 by the action of the limit block 803. Of course, it can be understood by those skilled in the art that a stopper needs to be provided to cooperate with the stopper 803, so that in practical operation, the stopper may be provided at a predetermined position of the sliding slot 104, or as shown in the figure, the edge of the channel connecting hole 102 is used as the stopper. Preferably, the stopper 803 is not required to be disposed on each of the pillars 802, and depending on the position of the stopper, only the top of the pillar 802 that is engaged with the channel connecting hole 102 is provided with the stopper 803, as shown in the figure.

The flow restriction function is the problem to be solved by the present invention, and in the foregoing, it is mentioned that the high pressure pushes the slider 8 to compress the spring 7 upwards, so that the flange exhaust passage, the passage connection hole 102, the second through hole 801 with the smaller size at the upper part of the slider 8, the open structure with the larger size at the lower part of the slider 8 and the first through hole 303 on the upper cover of the valve housing are communicated, thereby achieving the effect of exhaust and flow restriction.

On this basis, it is further contemplated that at lower pressures, it is not necessary to restrict flow only through the second aperture 801, in which case the exhaust flow rate may be increased relative to the restricted flow state. Accordingly, in other embodiments of the present invention, the second groove 107 is further disposed inside the boss 101, specifically, the second groove 107 is disposed below the first groove 106 and is in clearance fit with the slider 8, that is, when the slider 8 is located at the preset low position, the second groove 107 and the outer wall of the slider 8 form a ventilation channel, and then, in combination with the second through hole 801 on the slider 8, a certain exhaust flow rate is increased relative to the slider in the high position flow-limiting state. Therefore, the sliding block 8 can move between the preset low position and the preset high position through the pressure, so that a flow passage with different flow rates is formed, and the optimal control of the flow rate of the oil steam is achieved. It will be understood by those skilled in the art that, in order to achieve the above-mentioned preferred effect, a stepped structure may be formed between the first groove 106 and the second groove 107, specifically, the size of the first groove 106 is smaller than that of the second groove 107 (if it is a cylindrical structure, i.e. there is a difference in inner diameter), and the size of the first groove 106 is smaller than that of the slider 8 (if it is a cylindrical structure, i.e. the inner diameter of the first groove 106 is smaller than the outer diameter of the slider 8).

In order to improve the exhaust performance and effect of the ventilation channel formed by the second groove 107 and the outer wall of the slider 8, a plurality of raised baffles 103 are preferably arranged on the inner wall of the second groove 107, and a preset interval is formed between adjacent baffles 103. The main function of the baffle plate 103 is to leave a ventilation gap when the baffle plate 103 contacts with the sliding block 8, and the stable movement and the gap ventilation performance of the sliding block 8 can be considered.

Furthermore, it will be understood that the bottom edge of the second groove 107 may be identical to the lower edge 105 of the aforementioned boss 101, and in practice, the wall thickness of the lower edge 105 is preferably smaller than the wall thickness of the second groove 107. Further, the first through hole 303 may be a circular hole protruding upwards and outwards at the middle of the upper cover 302, so as to form a main exhaust channel 301 which is open up and down, specifically, the upper end of the first through hole 303 has an upper edge 304, and the upper edge 304 is connected with the lower edge 105 of the boss 101 in a sealing manner (in practical operation, for example, but not limited to, the sealing connection effect is achieved by interference fit).

For convenience of description, referring to fig. 1, a space enclosed by the outer side of the boss 101, the inner space of the valve flange 1, and the upper cover 302 may be a first chamber 9; the space enclosed by the first groove 106 may be set as a second chamber 10, the first chamber 9 is communicated with a valve exhaust passage connected to a canister (not shown in the drawing), and the first chamber 9 is communicated with the second chamber 10 through a passage connecting hole 102; the space enveloped by the second groove 107 and the first through hole 303 can be set as a third chamber 11, the communication relationship between the second chamber 10 and the third chamber 11 can be controlled in real time according to the pressure of oil vapor in the oil tank through the slider 8, and in combination with the above, when the pressure is high, the second chamber 10 is communicated with the third chamber 11 only through the second through hole 802, and when the pressure is low, the second chamber 10 is communicated with the third chamber 11 through the gap between the second groove 107 and the slider 8 and the second through hole 802; and the fourth chamber 12, which represents the internal space of the float 4, communicates with said third chamber 11 through a first through hole 303.

In connection with the above embodiments, the valve has a plurality of operating states: when the fuel tank pressure is lower than the preset value, as shown in fig. 5, the pressure acting on the slider 8 cannot overcome the gravity of the slider 8 itself and the elastic force of the spring 7, so that the slider 8 is at the preset low position (which can be understood as the lowest position of the slider stroke), and when the fuel vapor in the fuel tank flows from the fourth chamber 12 to the third chamber 11 and then flows from the third chamber 11 to the second chamber 10, the fuel vapor can have two ventilation paths, one is a flow-limiting channel in the middle of the slider 8: the second through hole 801 and the other is a gap between the second groove 107 and the slider 8. The pressure relief capacity of the two ventilation paths can meet the pressure relief requirement of the oil tank, and the smoothness of oil filling is not affected at all. Eventually, the fuel vapor flows from the second chamber 10 to the first chamber 9 and from the valve exhaust passage to the canister.

When the pressure of the fuel tank is higher than the preset value, as shown in fig. 6, at this time, the pressure acting on the slider 8 is greater than the gravity of the slider 8 itself and the elastic force of the spring 7, so that the slider 8 is at the preset high position (which can be understood as the highest position of the slider stroke) under the action of the pressure, the fuel vapor in the fuel tank flows from the fourth chamber 12 to the third chamber 11, and then flows from the third chamber 11 to the second chamber 10, the fuel vapor has only one ventilation path, namely, a flow-limiting channel in the middle of the slider 8: the second through hole 801 can guarantee that the gas flow rate is controlled within a certain range, and the conditions that the valve is prevented from being closed by mistake and the adsorption capacity of the carbon tank on high-speed oil vapor is reduced are achieved.

In summary, the main design concept of the present invention is to integrate the flow limiting function on the valve, specifically, a spring and a slider are arranged in a hollow boss on the inner surface of the valve flange, and a through hole at the upper end of the slider is smaller than an opening at the lower end and can move up and down in the vertical direction; the side wall of the boss is provided with a channel connecting hole communicated with the flange exhaust channel, and the mechanism has the function that when the slide block is positioned at a preset high position, the first through hole, the open structure, the second through hole and the channel connecting hole form a flow-limiting exhaust channel. The utility model has the characteristics of compact structure, low cost and high applicability, and adds the function of flow limiting and pressure relief on the exhaust channel of the fuel system, thereby effectively limiting the flow rate of fuel steam during high-pressure relief and further eliminating the negative influence of high-speed airflow on the fuel system and the environment.

In the embodiments of the present invention, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, and means that there may be three relationships, for example, a and/or B, and may mean that a exists alone, a and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c may represent: a, b, c, a and b, a and c, b and c or a and b and c, wherein a, b and c can be single or multiple.

The structure, features and effects of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the above embodiments are merely preferred embodiments of the present invention, and it should be understood that technical features related to the above embodiments and preferred modes thereof can be reasonably combined and configured into various equivalent schemes by those skilled in the art without departing from and changing the design idea and technical effects of the present invention; therefore, the utility model is not limited to the embodiments shown in the drawings, and all the modifications and equivalent embodiments that can be made according to the idea of the utility model are within the scope of the utility model as long as they are not beyond the spirit of the description and the drawings.

Claims

1. A compact fuel tank safety valve comprises a valve flange and a valve shell which are connected with each other, and is characterized in that a hollow boss is arranged on the inner surface of the valve flange, and a sliding block is connected in the boss in a sliding manner;

2. The compact fuel tank relief valve of claim 1, wherein said first through hole has an upper edge at an upper end thereof, said upper edge being sealingly connected to a lower edge of said boss.

3. The compact fuel tank relief valve of claim 1 wherein a first groove is provided in the interior of said boss and a plurality of runners are formed in the sidewall of said first groove;

4. The compact fuel tank relief valve of claim 3 wherein a stop is provided at the top end of said column for limited range of up and down movement of said slider within said first recess.

5. The compact fuel tank relief valve as set forth in claim 4 wherein a stop is provided on said chute and/or said channel connection opening for engagement with said stop block.

6. The compact fuel tank relief valve of claim 3, wherein said first groove has an inner diameter less than an outer diameter of said slider.

7. The compact fuel tank safety valve as defined in any one of claims 3 to 6 wherein a second groove is formed inside the boss;

8. The compact fuel tank relief valve as set forth in claim 7 wherein a plurality of raised baffles are provided on the inner wall of said second recess with a predetermined spacing between adjacent baffles.

9. The compact fuel tank relief valve of claim 7, wherein the bottom edge of said second groove is the lower edge of said boss and said lower edge has a wall thickness less than the wall thickness of said second groove.

10. The compact fuel tank relief valve as set forth in claim 7 wherein said first recess and said second recess have a stepped configuration therebetween.