Compact high pressure reopening valve for vehicle fuel tanks

Abstract

The present invention discloses a compact high-pressure reopening valve for a vehicle fuel tank, and proposes to utilize the mechanism of the vertical pressure acting on the force-bearing surface, and design the matching structure of the first-order and second-order floats of the valve into an inclined plane, so that the pressure on the float can be decomposed into two components, the horizontal direction and the vertical direction, wherein the vertical direction component is smaller than that of the traditional valve, thereby achieving the goal of increasing the reopening pressure of the valve. Specifically, an upper cover inclined surface structure and a second-order exhaust channel are provided on the upper cover raised portion of the valve housing, the first-order float is provided with a hollow float raised portion having a first inclined surface structure, the second-order float is provided with a second inclined surface structure having a first-order exhaust channel, and the second-order float is movably connected to the first-order float, and the inclinations of the above three inclined surface structures are consistent and cooperate with each other. The present invention has the advantages of compact structure, low cost, no additional parts and components, and strong applicability, and can significantly improve the reopening performance of the valve.

Description

Technical Field

[0001] The invention relates to the field of vehicle fuel tanks, and in particular to a compact high-pressure reopening valve for vehicle fuel tanks. Background Art

[0002] When the vehicle is driving or refueling, the swaying of the fuel level will hit the valve float, causing the valve to close. Under such conditions, if the valve cannot be opened in time to vent, the pressure inside the tank will continue to accumulate, posing a safety risk. The ability of the valve to open in time under high pressure conditions is called reopening performance. Generally speaking, the fuel tank industry configures the reopening process as a two-stage opening:

[0003] The first stage is called the first-order reopening performance, which uses the gravity of the first-order large float to overcome the upward spring force and upward pressure to achieve the purpose of first-order reopening. The key factor for the first-stage reopening is that the aperture of the corresponding first-order exhaust hole must be small enough. Since pressure is equal to the product of pressure and force area, it can be seen that the pressure acting at this time is small, so the first-order reopening effect can be achieved by relying on the gravity of the downward first-order large float. When the first stage is completed, the first-order exhaust hole on the valve has been fully opened for exhaust, but due to the limitation of the aperture of the first-order exhaust hole, the exhaust capacity is limited.

[0004] The second stage is called the second-order reopening performance. The pressure in the oil tank has dropped to a certain value. The area of ​​the second-order exhaust hole is relatively large. The pressure multiplied by the pressure and the force area is small enough. The total gravity of the first-order float and the second-order float can be used to overcome the upward spring force and the upward pressure to achieve the purpose of second-order reopening. As mentioned above, the key factor in the second-stage reopening is that the pressure inside the oil tank has dropped to a certain value. After the second stage is completed, the second-order exhaust hole on the valve is fully opened. The second-order exhaust hole is larger in size, and the exhaust capacity is significantly improved compared to the first-order exhaust hole.

[0005] Regarding the reopening performance of the valve, the valves currently used in the fuel tank industry have the following problems:

[0006] 1. The reopening performance of the valve has always lagged behind the needs of vehicle OEMs. At present, the first-order reopening pressure of common valves on the market is generally around 15KPa, and the second-order reopening pressure is generally around 1KPa. However, some OEMs require the first-order reopening pressure of the valve to be 38KPa and the second-order reopening pressure to be 3KPa. Currently, there are basically no valves on the market that can meet this requirement.

[0007] 2. After the valve is accidentally closed due to special working conditions, the valves currently on the market often cannot be reopened in time, because the first-order reopening pressure is generally around 15KPa, and the fuel tank system pressure needs to slowly drop to 15KPa or below, so that the gravity of the first-order float of the valve can overcome the upward elastic force and pressure, so that the first-order small hole can be fully opened for small flow exhaust. Since the first-order reopening pressure of the current valve is too small, the fuel tank cannot be exhausted in time, and there may be safety issues such as deformation or leakage of the fuel tank caused by excessive internal pressure in the fuel tank.

[0008] 3. Since the second-stage opening pressure of the valve is currently smaller, generally around 1KPa, this means that after the valve is reopened in the first stage, the pressure in the oil tank needs to be reduced to or below the second-stage opening pressure before the second-stage exhaust hole can be opened for large-flow pressure relief, that is, it takes a longer time to relieve the pressure in the oil tank to the second-stage reopening pressure. Too long a pressure relief time may cause continued accumulation of pressure and fail to meet the requirement of rapid pressure relief. Summary of the invention

[0009] In view of the above, the present invention aims to provide a compact high-pressure reopening valve for a vehicle fuel tank to solve the problem of too low first-order reopening pressure and second-order reopening pressure of the existing valve.

[0010] The technical solution adopted by the present invention is as follows:

[0011] A compact high-pressure reopening valve for a vehicle fuel tank comprises a valve housing, and a first-stage float and a second-stage float located in the valve housing, wherein:

[0012] An upper cover convex portion is formed on the upper cover of the valve housing, the upper cover convex portion has an upper cover inclined surface structure, and a second-stage exhaust channel is provided on the upper cover inclined surface structure;

[0013] A hollow float protrusion is provided on the top of the first-stage float, and the float protrusion has a first inclined surface structure;

[0014] The body of the second-order float is formed with a second inclined surface structure, a first-order exhaust channel corresponding to the second-order exhaust channel is provided on the second inclined surface structure, and the second-order float is movably connected to the first-order float through a sliding device;

[0015] The first inclined surface structure, the second inclined surface structure and the upper cover inclined surface structure have the same inclination, and the outer surface of the first inclined surface structure matches the inner surface of the second inclined surface structure, and the outer surface of the second inclined surface structure matches the inner surface of the upper cover inclined surface structure.

[0016] In at least one possible implementation manner: the upper cover protrusion is an angular protrusion, the upper cover inclined surface structure includes at least two symmetrical inclined surfaces; and the second-order exhaust channels are respectively arranged on the symmetrical inclined surfaces and have a symmetrical relationship.

[0017] In at least one possible implementation manner: the float protrusion includes a sealing column, and the first inclined surface structure is formed on the top surface of the sealing column;

[0018] The sealing column has a flat plate structure, and the first inclined surface structure includes a straight inclined surface.

[0019] In at least one possible implementation manner: the second slope structure includes a straight slope.

[0020] In at least one possible implementation manner, the upper cover protrusion is a conical protrusion, the upper cover inclined surface structure has a conical surface structure, and the second-order exhaust channel includes a plurality of through holes arranged on the conical surface.

[0021] In at least one possible implementation manner: the float protrusion includes a sealing column, and the first inclined surface structure is formed on the top surface of the sealing column;

[0022] The sealing column has a cylindrical structure, and the first inclined surface structure has a conical surface structure;

[0023] The hollow interior of the float protrusion is communicated with the interior of the first-stage float.

[0024] In at least one possible implementation manner: the second inclined surface structure includes a conical surface structure.

[0025] In at least one possible implementation manner: after the first slope structure contacts the second slope structure, the first-stage exhaust channel is sealed from the inner side of the second slope structure;

[0026] After the second inclined surface structure contacts the upper cover inclined surface structure, the second-stage exhaust passage is sealed from the inner side of the upper cover inclined surface structure.

[0027] In at least one possible implementation manner: a sealing gasket for sealing the second-order exhaust channel is provided on the second slope structure, and a through hole communicating with the first-order exhaust channel is opened on the sealing gasket.

[0028] In at least one possible implementation manner, a column is formed at the lower end of the body of the second-stage float, and a limit block is formed at the root of the column.

[0029] In at least one possible implementation manner, slide groove columns are provided on the top surface of the first-stage float and on both sides of the float protrusion, and the slide groove columns are provided with vertical slide grooves that cooperate with the limit blocks.

[0030] In at least one possible implementation manner, a vertical sliding groove cooperating with the limiting block is provided on the main body of the float protrusion.

[0031] The main design concept of the present invention is to propose to utilize the mechanism of the vertical pressure acting on the force-bearing surface, and design the matching structure of the first-order and second-order floats of the valve into an inclined plane, so that the pressure on the float can be decomposed into two components, the horizontal direction and the vertical direction, wherein the vertical direction component is smaller than that of the traditional valve, thereby achieving the goal of increasing the valve reopening pressure. Specifically, the upper cover protrusion of the valve housing upper cover has an upper cover inclined surface structure, and the upper cover inclined surface structure is provided with a second-order exhaust channel. The top of the first-order float is provided with a hollow float protrusion with a first inclined surface structure, the second-order float is movably connected to the first-order float and forms a second inclined surface structure, and the second inclined surface structure is provided with a first-order exhaust channel. The above three inclined surface structures have the same inclination and cooperate with each other. The present invention has the advantages of compact structure, low cost, no additional parts and components, and strong applicability, and can significantly improve the reopening performance of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0033] Figure 1 A cross-sectional view of a compact high pressure reopening valve for a vehicle fuel tank provided by an embodiment of the present invention;

[0034] Figure 2 A detailed view of a valve housing provided by an embodiment of the present invention;

[0035] Figure 3 A detailed diagram of a first-order float provided in an embodiment of the present invention;

[0036] Figure 4 A detailed diagram of a second-order float provided by an embodiment of the present invention;

[0037] Figure 5 A cross-sectional view of a compact high-pressure reopening valve provided by an embodiment of the present invention in a fully open state;

[0038] Figure 6 A cross-sectional view of a compact high-pressure reopening valve provided by an embodiment of the present invention in a fully closed state;

[0039] Figure 7 A cross-sectional view of a compact high-pressure reopening valve provided by an embodiment of the present invention in a first-order opening state;

[0040] Figure 8 A cross-sectional view of a compact high-pressure reopening valve provided in an embodiment of the present invention in a second-stage opening state (just opened). DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0042] The present invention provides an embodiment of a compact high pressure reopening valve for a vehicle fuel tank, specifically, as Figure 1 and Figure 2 As shown (it should be pointed out that in actual operation, the spring is in a compressed state, it is just a matter of how much compression there is, and in all the drawings of the present invention, the spring does not represent its working state, but is only a schematic representation of its working position), the valve comprises: a valve housing 2, and a first-order float 5 and a second-order float 7 located in the valve housing 2, wherein an upper cover protrusion is formed in the middle of the upper cover 201 of the valve housing 2, the upper cover protrusion has an upper cover inclined surface structure 202, and a second-order exhaust channel 203 is provided on the upper cover inclined surface structure 202.

[0043] The upper cover protrusion shown in the figure is an angular protrusion, so the upper cover inclined surface structure 202 can be specifically two symmetrical inclined surfaces, thereby, the second-order exhaust channel 203 can be respectively arranged in the middle of the two symmetrical inclined surfaces and can also have a symmetrical relationship.

[0044] Of course, in other embodiments of the present invention, the upper cover protrusion may also be but not limited to a conical protrusion, and thus the upper cover inclined surface structure 202 refers to the entire conical surface of the conical protrusion, and thus, the second-order exhaust channel 203 may refer to a plurality of through holes provided on the conical surface.

[0045] Continuing from the previous article, Figure 1 and Figure 3 As shown, a hollow float protrusion is provided on the top of the first-stage float 5, and the float protrusion has a sealing column 502, and a first inclined surface structure 503 is provided on the top surface of the sealing column 502, and the inclination of the first inclined surface structure 503 is consistent with the inclination of the upper cover inclined surface structure 202.

[0046] As mentioned above, the upper cover protrusion can be realized in a variety of structural styles. Figure 3 The sealing pillar 502 and the first inclined surface structure 503 thereon are shown as follows: Figure 1The illustrated angular protrusion structure is adapted in a manner such that, in this example, the sealing column 502 of the float protrusion has a flat plate structure, and the first inclined surface structure 503 thereon is two straight inclined surfaces.

[0047] In other embodiments of the present invention, such as but not limited to the conical upper cover protrusion, the sealing column 502 of the float protrusion may have a cylindrical structure, and the first inclined surface structure 503 thereon may be a conical structure adapted to the upper cover protrusion. Of course, those skilled in the art will understand that when a float protrusion having a cylindrical surface and a conical surface is used, the hollow interior of the float protrusion is connected to the interior of the first-stage float 5.

[0048] Continuing from the previous article, Figure 1 and Figure 4 As shown, the body of the second-order float 7 has a second inclined surface structure 701, and the inclination of the second inclined surface structure 701 is consistent with the inclination of the upper cover inclined surface structure 202; a first-order exhaust channel 703 is provided on the second inclined surface structure 701, and after the second-order float 7 is matched with the upper cover protrusion, the first-order exhaust channel 703 is connected with the second-order exhaust channel 203.

[0049] As mentioned above, the second inclined surface structure 701 (that is, the body of the second-stage float 7) can be an angular flat plate as shown in the figure, or a cone structure, that is, the upper cover protrusion, the float protrusion and the second-stage float 7 are adapted to each other.

[0050] Specifically, the outer surface of the first inclined surface structure 503 cooperates with the inner side surface of the second inclined surface structure 701, and the outer surface of the second inclined surface structure 701 cooperates with the inner side surface 204 of the upper cover inclined surface structure 202. Preferably, when the first inclined surface structure 503 contacts the second inclined surface structure 701, the first-stage exhaust channel 703 can be sealed from the inner side of the second inclined surface structure 701. Further, when the second inclined surface structure 701 contacts the upper cover inclined surface structure 202, the second-stage exhaust channel 203 can be sealed from the inner side of the upper cover inclined surface structure 202. Based on this concept, in order to ensure that the relatively lightweight second-order float 7 can reliably seal the second-order exhaust channel 203, in some preferred embodiments, a sealing gasket 8 for sealing the second-order exhaust channel 203 is provided on the second inclined surface structure 701, and a through hole communicating with the first-order exhaust channel 703 is opened on the sealing gasket 8. That is, it can be understood that in the solution using the sealing gasket 8, the through hole on the sealing gasket 8 is equivalent to the first-order exhaust channel 703.

[0051] Continuing from the above, the second-stage float 7 is movably connected to the first-stage float 5 via a sliding device, and the sliding device is used to enable the body of the second-stage float 7 to move up and down on the float protrusion of the first-stage float 5.

[0052] In actual operation, a column 702 (either plate-shaped or strip-shaped) can be provided at the lower end of the body of the second-order float 7, and a limit block 704 (which can also be understood as a slider) is formed at the root of the column 702. There are corresponding multiple options for the selection and design of the sliding device. As shown in the figure, a slide column 501 can be provided on both sides of the float protrusion on the top surface of the first-order float 5, and a slide groove cooperating with the limit block 704 is provided on the slide column 501, so that the second-order float 7 can be moved up and down (vertical direction) on the slide column 501 on the first-order float 5.

[0053] In addition, it is also possible to consider directly providing a mechanism that cooperates with the column 702 and the limit block 704 on the main body of the float protrusion, for example, providing a slide groove on the sealing column 502 of the float protrusion, so that the main body of the second-order float 7 can move down the mountain directly on the float protrusion of the first-order float.

[0054] Of course, it can also be pointed out that the other components of the valves mentioned in the above embodiments can refer to the existing valve structure. Figure 1 For example, the valve housing 2 is a cylindrical housing with an opening facing downward, the valve housing 2 and the flange 1 are sealed and connected by an O-ring 3, and a base 4 is disposed outside the valve housing 2, the inner surface of the base 4 is connected to one end of a spring 6, and the other end of the spring 6 is connected to the inner surface of the first-order float 5, so that the first-order float 5 can move up and down in the vertical direction in the space defined inside the housing 2. In addition, the diameter of the first-order exhaust channel 703 is much smaller than that of the second-order exhaust channel 203, and the weight of the first-order float 5 is much greater than that of the second-order float 7.

[0055] In combination with the above embodiments of the present invention, the valve has multiple working states:

[0056] (1) The valve is in the fully open state. Specifically, Figure 5 As shown, at this stage, the total gravity of the first-order float 5 and the second-order float 7 is greater than the elastic force of the spring 6, and the first-order float 5 and the second-order float 7 are both at the lowest position, wherein the inner side surface of the second inclined surface structure 701 on the lightweight second-order float 7 body is matched and connected with the outer surface of the first inclined surface structure 503. At this time, the oil vapor in the fuel tank can directly flow to the carbon canister (not marked in the figure) through the second-order exhaust channel 203 on the valve housing 2.

[0057] (2) The valve is in a fully closed state. Specifically, Figure 6 As shown, when the fuel level is high or the fuel tank is turned over, the valve is in a completely closed state. At this time, the first-order float 5 and the second-order float 7 are both in the highest position, so that the first inclined surface structure 503, the second inclined surface structure 701 and the inner side surface 204 of the upper cover inclined surface structure 202 are in contact with each other in sequence, and the oil vapor or liquid fuel in the fuel tank cannot be discharged through the valve.

[0058] (3) The valve is in the first-order open state. Specifically, Figure 7 As shown in the figure, during the vehicle driving or refueling process, the swaying of the fuel level will hit the valve float, causing the valve to close. If there is pressure inside the fuel tank at this time, in order to prevent the fuel tank from deforming under high pressure, the float needs to be able to open in time to exhaust gas, which is usually called the valve reopening performance. Traditional valves generally use the gravity of the float to overcome the pressure on the sealing surface under the vertical action of the internal pressure of the fuel tank and the upward elastic force, so as to achieve the purpose of reopening.

[0059] The first inclined surface structure 503 on the first-stage float 5 mentioned in the aforementioned embodiment of the present invention has a certain inclination angle. Therefore, when the pressure in the oil tank acts on the first inclined surface structure 503, the pressure acts perpendicularly on the first inclined surface structure 503. The pressure can be decomposed into a horizontal component force and a vertical component force relative to the valve. Regardless of whether it is the symmetrical inclined surface structure or the conical surface mentioned above, the horizontal component forces will offset each other and will not affect the vertical force of the float.

[0060] Therefore, because only the vertical component will affect the reopening performance of the valve, under the premise that the internal pressure of the oil tank is consistent with that of the traditional valve and the total exhaust area is the same, it can be deduced that the vertically upward force acting on the float in the solution of the present invention is definitely smaller than the pressure on the traditional valve. In particular, when different preset inclination angles are used, such as when the inclination angle of the first inclined surface structure 503 is 45 degrees, the vertically upward force acting on the first-order float is only 0.707 times the pressure on the traditional valve; when the inclination angle of the first inclined surface structure 503 is 60 degrees, the vertically upward force acting on the first-order float is only half of the pressure on the traditional valve. Therefore, the vertically upward force acting on the first-order float in the valve of the present invention is significantly reduced compared to the pressure on the traditional valve. In other words, the first-order reopening pressure of the valve provided by the present invention can be significantly increased accordingly.

[0061] Therefore, after the first stage is opened, the first stage float 5 moves downward and is in the middle position, and the displacement of the movement is determined by the aforementioned sliding device. At this time, the first stage exhaust channel 703 is opened, and the fuel tank begins to release pressure through the first stage exhaust channel 703 (small hole).

[0062] (4) The valve is in the second-order opening state (just opened). Figure 8 As shown, after the first-stage valve is opened, the internal pressure of the fuel tank begins to gradually decrease. At this time, the first-stage float 5 is in the middle position, and the first-stage exhaust channel 703 is opened for exhaust. The internal pressure of the fuel tank directly acts on the second-stage float 7. According to the above-mentioned principle that the inclined structure can reduce the vertical force, the vertical upward force acting on the second-stage float in the valve is significantly reduced than the pressure on the traditional valve. In other words, the second-stage reopening pressure of the valve provided by the present invention can also be greatly increased accordingly.

[0063] Therefore, the valve of the present invention can open the second-stage exhaust channel 203 to release pressure at a large flow rate under a higher internal pressure of the oil tank, until the internal pressure of the oil tank drops to a very low pressure value, and then the second-stage float 7 falls completely and the second-stage exhaust channel 203 is fully opened.

[0064] In summary, the main design concept of the present invention is to propose to utilize the mechanism of the vertical pressure acting on the force-bearing surface, and design the matching structure of the first-order and second-order floats of the valve into an inclined plane, so that the pressure on the float can be decomposed into two components, the horizontal direction and the vertical direction, wherein the vertical direction component is smaller than that of the traditional valve, thereby achieving the goal of increasing the valve reopening pressure. Specifically, the upper cover raised portion of the valve housing upper cover has an upper cover inclined surface structure, a second-order exhaust channel is provided on the upper cover inclined surface structure, a hollow float raised portion with a first inclined surface structure is provided on the top of the first-order float, the second-order float is movably connected to the first-order float and forms a second inclined surface structure, a first-order exhaust channel is provided on the second inclined surface structure, and the above three inclined surface structures have the same inclination and cooperate with each other. The present invention has the advantages of compact structure, low cost, no additional parts and components, and strong applicability, and can significantly improve the reopening performance of the valve.

[0065] In the embodiments of the present invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. A and B may be singular or plural. The character " / " generally indicates that the associated objects before and after 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 single 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, where a, b, c may be single or multiple.

[0066] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred methods can be reasonably combined and matched into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the present invention is not limited to the scope of implementation shown in the drawings, and all changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification and drawings, should be within the protection scope of the present invention.

Claims

1. A compact high pressure reopening valve for a vehicle fuel tank, comprising a valve housing, and a first-stage float and a second-stage float located in the valve housing, characterized in that: An upper cover convex portion is formed on the upper cover of the valve housing, the upper cover convex portion has an upper cover inclined surface structure, and a second-stage exhaust channel is provided on the upper cover inclined surface structure; A hollow float protrusion is provided on the top of the first-stage float, and the float protrusion has a first inclined surface structure; The second-order float is a second inclined surface structure as a whole, a first-order exhaust channel corresponding to the second-order exhaust channel is provided on the second inclined surface structure, and the second-order float is movably connected to the first-order float through a sliding device; The first inclined surface structure, the second inclined surface structure and the upper cover inclined surface structure have the same inclination, and the outer surface of the first inclined surface structure matches the inner surface of the second inclined surface structure, and the outer surface of the second inclined surface structure matches the inner surface of the upper cover inclined surface structure.

2. The compact high pressure reopening valve for a vehicle fuel tank according to claim 1, characterized in that: The upper cover raised portion is an angular raised portion, and the upper cover inclined surface structure includes at least two symmetrical inclined surfaces; the second-order exhaust channels are respectively arranged on the symmetrical inclined surfaces and have a symmetrical relationship.

3. The compact high pressure reopening valve for a vehicle fuel tank according to claim 2, characterized in that: The float protrusion comprises a sealing column, and the first inclined surface structure is formed on the top surface of the sealing column; The sealing column has a flat plate structure, and the first inclined surface structure includes a straight inclined surface.

4. The compact high pressure reopening valve for a vehicle fuel tank according to claim 2, characterized in that: The second inclined surface structure includes a straight inclined surface.

5. The compact high pressure reopening valve for a vehicle fuel tank according to claim 1, characterized in that: The upper cover raised portion is a conical raised portion, the upper cover inclined surface structure has a conical surface structure, and the second-order exhaust channel includes a plurality of through holes arranged on the conical surface.

6. The compact high pressure reopening valve for a vehicle fuel tank according to claim 5, characterized in that: The float protrusion comprises a sealing column, and the first inclined surface structure is formed on the top surface of the sealing column; The sealing column has a cylindrical structure, and the first inclined surface structure has a conical surface structure; The hollow interior of the float protrusion is communicated with the interior of the first-stage float.

7. The compact high pressure reopening valve for a vehicle fuel tank according to claim 5, characterized in that: The second inclined surface structure includes a conical surface structure.

8. The compact high pressure reopening valve for a vehicle fuel tank according to claim 1, characterized in that: After the first inclined surface structure contacts the second inclined surface structure, the first-stage exhaust channel is sealed from the inner side of the second inclined surface structure; After the second inclined surface structure contacts the upper cover inclined surface structure, the second-stage exhaust passage is sealed from the inner side of the upper cover inclined surface structure.

9. The compact high pressure reopening valve for a vehicle fuel tank according to claim 8, characterized in that: A sealing gasket for sealing the second-order exhaust channel is provided on the second inclined surface structure, and a through hole communicating with the first-order exhaust channel is opened on the sealing gasket.

10. The compact high pressure reopening valve for a vehicle fuel tank according to any one of claims 1 to 9, characterized in that: A column is formed at the lower end of the body of the second-stage float, and a limit block is formed at the root of the column.

11. The compact high pressure reopening valve for a vehicle fuel tank according to claim 10, characterized in that: Slide groove columns are arranged on the top surface of the first-stage float and on both sides of the float protrusion, and the slide groove columns are provided with vertical slide grooves matched with the limit blocks.

12. The compact high pressure reopening valve for a vehicle fuel tank according to claim 10, characterized in that: A vertical sliding groove matched with the limiting block is arranged on the main body of the float protrusion.

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