FLVV valve

Abstract

According to the FLVV valve, a gas-liquid input cavity, a valve element containing cavity and an exhaust cavity which communicate with one another are formed in a valve body, a valve element assembly is arranged in the valve element containing cavity to achieve opening and closing of an exhaust channel, and the gas-liquid input cavity is arranged to be a high-position cavity higher than the valve element containing cavity; the gas-liquid input channel on the valve body is arranged to be at least partially communicated with the overhead cavity, that is, compared with the situation that the height of the gas-liquid input channel is located within the height range of the valve element containing cavity in a conventional design scheme, the height of the gas-liquid input channel can be further increased, and therefore the gas-liquid input channel can be more stable in the refueling state; the height of oil entering the valve body through the gas-liquid input channel in the fuel tank is increased, then the gun jumping height of the fuel tank is increased, and the problem that the gun jumping height requirement of a flat fuel tank cannot be met through an existing FLVV valve scheme is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of fuel tanks, and in particular relates to a FLVV valve. Background Art

[0002] FLVV valve, or Fuel Tank Ventilation Valve, is a valve used to control the ventilation and refueling process of the automobile fuel tank. Its main function is to control the amount of fuel added. When refueling, the fuel level gradually rises. The FLVV valve will automatically close the refueling channel at a certain level to prevent overfilling of fuel and avoid safety hazards and environmental pollution caused by fuel overflow.

[0003] With the development of fuel vehicles and hybrid vehicles, the design structure of fuel tanks has gradually become flatter, which has resulted in the closing height of the existing conventionally designed FLVV valve being unable to meet the closing (jumping gun) height requirements of flat fuel tanks. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a FLVV valve to solve the problem that the existing FLVV valve solution cannot meet the requirement of the jump gun height of the flat oil tank.

[0005] To solve the above problems, the technical solution of the present invention is: A FLVV valve of the present invention is used for installation on a fuel tank, and defines the lifting direction of the oil in the fuel tank as the height direction, and includes: A valve body, wherein the valve body is provided with a gas-liquid input chamber, a valve core accommodating chamber and an exhaust chamber which are connected in sequence; and the valve body is provided with a gas-liquid input channel which is connected with the gas-liquid input chamber and the inner chamber of the fuel tank, and the valve body is provided with an output pipe which is connected to the exhaust chamber; A valve core assembly is arranged in the valve core accommodating chamber, and the valve core assembly is configured to open or close an exhaust passage connecting the valve core accommodating chamber and the exhaust chamber; Among them, at least part of the gas-liquid input cavity is higher than the valve core accommodating cavity, and the area where the gas-liquid input cavity is higher than the valve core accommodating cavity is a high chamber; and at least part of the gas-liquid input channel is connected to the high chamber.

[0006] The FLVV valve of the present invention, the exhaust chamber comprises a top chamber and a side end chamber which are connected; The top chamber is arranged above the valve core accommodating chamber, and the top chamber is connected to the valve core accommodating chamber through the exhaust passage; the side end chamber is not higher than the top surface of the valve core accommodating chamber in the height direction; Wherein, at least part of the output pipe is connected to the connection interface of the valve body and communicates with the side end chamber.

[0007] The FLVV valve of the present invention, the valve body comprises an outer shell, a bottom shell and a top cover; The shell comprises a shell body and a partition plate arranged in the shell body, the partition plate divides the internal space of the shell body into an upper open chamber and a lower open chamber, and the partition plate comprises a first plate area corresponding to the valve core accommodating chamber and a second plate area corresponding to the gas-liquid input chamber; The bottom shell is installed in the lower opening chamber and cooperates to form the valve core accommodating chamber and the gas-liquid input chamber; the top cover is installed in the upper opening chamber and cooperates to form the exhaust chamber; Wherein, the exhaust passage is provided on the partition plate, and a sealing port matching the exhaust passage is provided on the surface of the partition plate facing the valve core accommodating cavity.

[0008] In the FLVV valve of the present invention, at least part of the partition plate of the second plate area is configured to form a raised structure, and the raised structure is used to form the elevated chamber.

[0009] In the FLVV valve of the present invention, at least part of the partition plate of the second plate area is configured to form a concave structure, and the concave structure is used to cooperate with the top cover to form part of the exhaust chamber.

[0010] The FLVV valve of the present invention, the bottom shell comprises a bottom plate and a valve core accommodating shell connected to each other; The bottom plate is configured to cover the lower opening chamber; the valve core accommodating shell is configured to extend into the lower opening chamber, the inner wall surface of the valve core accommodating shell cooperates with the partition plate and the bottom plate to form the valve core accommodating chamber, and at least a portion of the outer wall surface of the valve core accommodating shell cooperates with the outer shell body to form the gas-liquid input chamber; Among them, at least one oil input channel and at least one gas input channel connecting the valve core accommodating chamber and the gas-liquid input chamber are provided on the valve core accommodating shell, and the oil input channel and the gas input channel are both located away from the gas-liquid input channel.

[0011] The FLVV valve of the present invention, the valve core assembly includes a float, an elastic member and a sealing assembly; The float is slidably connected to the valve core accommodating cavity along the height direction, and the two ends of the elastic member are respectively connected to the float and the valve core accommodating cavity; the sealing component is arranged at the top of the float, and is used to cooperate with the float to open or close the exhaust channel.

[0012] The FLVV valve of the present invention, the sealing assembly comprises an elastic diaphragm and at least one positioning member; The elastic diaphragm is fixed to the top of the float through the positioning member, and the elastic diaphragm is configured to generate elastic deformation under the downward traction force formed by the float in the height direction.

[0013] In the FLVV valve of the present invention, the top of the float is provided with a protruding structure corresponding to the elastic diaphragm.

[0014] The FLVV valve of the present invention further comprises a welding piece for welding to the fuel tank, wherein the welding piece is snap-connected to the valve body.

[0015] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art: 1. In one embodiment of the present invention, a gas-liquid input chamber, a valve core accommodating chamber and an exhaust chamber are connected in the valve body, a valve core assembly is arranged in the valve core accommodating chamber to realize the opening and closing of the exhaust passage, and the gas-liquid input chamber is arranged to be a high chamber higher than the valve core accommodating chamber (the high chamber extends into the height of the exhaust chamber of the existing FLVV design scheme), and the gas-liquid input passage on the valve body is arranged to be at least partially connected to the high chamber, that is, compared with the situation in the conventional design scheme where the height of the gas-liquid input passage is within the height range of the valve core accommodating chamber, the height of the gas-liquid input passage of this embodiment can be further increased, so that in the refueling state, the height of the oil in the fuel tank entering the valve body through the gas-liquid input passage is increased, thereby realizing the increase of the fuel tank gun jump height, which solves the problem that the existing FLVV valve scheme cannot meet the flat tank gun jump height requirement.

[0016] 2. In one embodiment of the present invention, the exhaust chamber is configured to have a top chamber and a connected side chamber, and the output pipe is configured to be at least partially connected to the side chamber, so that the height of the top chamber can be set as small as possible, and the valve core accommodating chamber can be extended to the height of the exhaust chamber of the existing FLVV design (part of the valve core accommodating chamber is at the same height as the side chamber), so that the overall height of the valve can be further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an exploded view of the FLVV valve of this embodiment; Figure 2 is a cross-sectional view of the FLVV valve of this embodiment during the refueling process; Figure 3 is a cross-sectional view of the FLVV valve of this embodiment in a refueling limited state; Figure 4 is a cross-sectional view of the FLVV valve of this embodiment in a state where the oil in the fuel tank is partially consumed; Figure 5 is a cross-sectional view of the FLVV valve of this embodiment when the oil in the fuel tank is lower than the valve body; Figure 6 Schematic diagram of the gas-liquid input channel of the FLVV valve of this embodiment.

[0018] Explanation of the accompanying drawings: 1. Shell; 101. Shell body; 1011. Gas-liquid input channel; 102. Partition plate; 1021. Lifting structure; 1022. Concave structure; 1023. Exhaust channel; 1024. Sealing port; 103. Output pipe; 2. Bottom shell; 201. Bottom plate; 202. Valve core accommodating shell; 2021. Oil input channel; 2022. Gas input channel; 3. Top cover; 4. Float; 5. Elastic diaphragm; 6. Positioning member; 7. Elastic member; 8. Gas-liquid input chamber; 801. High chamber; 9. Exhaust chamber; 901. Top chamber; 902. Side chamber; 10. Valve core accommodating chamber. DETAILED DESCRIPTION

[0019] The advantages and features of the present invention will become more apparent from the following description and claims.

[0020] See also Figures 1 to 6 In one embodiment, a FLVV valve is used to be installed on a fuel tank, and the lifting direction of the oil in the fuel tank is defined as a height direction. The FLVV valve includes a valve body and a valve core assembly.

[0021] The valve body is provided with a gas-liquid input chamber 8, a valve core accommodating chamber 10 and an exhaust chamber 9 which are connected in sequence. Also, the valve body is provided with a gas-liquid input channel 1011 which connects the gas-liquid input chamber 8 and the inner chamber of the fuel tank, and the valve body is provided with an output pipe 103 which connects to the exhaust chamber 9. The valve core assembly is arranged in the valve core accommodating chamber 10, and the valve core assembly is configured to open or close the exhaust channel 1023 which connects the valve core accommodating chamber 10 and the exhaust chamber 9.

[0022] Among them, at least part of the gas-liquid input chamber 8 is higher than the valve core accommodating chamber 10 , and the area where the gas-liquid input chamber 8 is higher than the valve core accommodating chamber 10 is the high chamber 801 , and at least part of the gas-liquid input channel 1011 is connected to the high chamber 801 .

[0023] In this embodiment, the gas-liquid input chamber 8, the valve core accommodating chamber 10 and the exhaust chamber 9 are connected to each other in the valve body, and a valve core assembly is arranged in the valve core accommodating chamber 10 to realize the opening and closing of the exhaust passage 1023, and the gas-liquid input chamber 8 is arranged to have a high chamber 801 higher than the valve core accommodating chamber 10 (the high chamber 801 extends into the height of the exhaust chamber 9 in the existing FLVV design scheme), and the gas-liquid input channel 1011 on the valve body is arranged to be at least partially connected to the high chamber 801, that is, compared with the situation in the conventional design scheme where the height of the gas-liquid input channel 1011 is located within the height range of the valve core accommodating chamber 10 (in the existing FLVV design scheme, the valve shell is equipped with a valve core assembly). The valve core accommodating chamber 10 and the gas-liquid input chamber 8 surrounding the valve core accommodating chamber 10 are formed together. Due to the limitation of the shell forming the structure, the valve core accommodating chamber 10 and the gas-liquid input chamber 8 are located at the same height, which leads to the gas-liquid input channel 1011 connected to the gas-liquid input chamber 8 being limited to the height of the valve core accommodating chamber 10). The height of the gas-liquid input channel 1011 of this embodiment can be further increased, so that in the refueling state, the height of the oil in the fuel tank entering the valve body through the gas-liquid input channel 1011 is increased, thereby achieving the increase in the fuel tank jump gun height, which solves the problem that the existing FLVV valve solution cannot meet the flat fuel tank jump gun height requirement.

[0024] The specific structure of the FLVV valve of this embodiment is further described below: In this embodiment, the exhaust chamber 9 includes a top chamber 901 and a side chamber 902 that are connected. The top chamber 901 is arranged above the valve core accommodating chamber 10, and the top chamber 901 is connected to the valve core accommodating chamber 10 through the exhaust channel 1023. The side chamber 902 is not higher than the top surface of the valve core accommodating chamber 10 in the height direction. Among them, at least part of the output pipe 103 is connected to the connection interface of the valve body and is connected to the side chamber 902.

[0025] In this embodiment, the exhaust chamber 9 is configured to have a top chamber 901 and a connected side chamber 902, and the output pipe 103 is configured to be at least partially connected to the side chamber 902, so that the height of the top chamber 901 can be set as small as possible (sufficient to meet the overall flow resistance of the fuel tank system), and the valve core accommodating chamber 10 can be extended to the height of the exhaust chamber 9 of the existing FLVV design (part of the valve core accommodating chamber 10 is at the same height as the side chamber 902), so that the overall height of the valve can be further reduced, and the reduction in the height of the top chamber 901 can raise the sealing surface of the top of the valve core accommodating chamber, thereby further increasing the closing height of the valve. That is, the arrangement of the side chamber 902 and the arrangement of the high chamber 801, by raising the valve closing height and the height of the gas-liquid input channel 1011, the two are combined to achieve an overall increase in the height of the fuel tank jump gun, thereby adapting to the development route of the existing flattening of fuel tanks.

[0026] Specifically, in order to realize the above structure, the valve body may specifically include an outer shell 1 , a bottom shell 2 and a top cover 3 .

[0027] The housing 1 includes a housing body 101 and a partition plate 102 arranged in the housing body 101. The partition plate 102 divides the internal space of the housing body 101 into an upper open chamber and a lower open chamber, and the partition plate 102 includes a first plate area corresponding to the valve core accommodating chamber 10 and a second plate area corresponding to the gas-liquid input chamber 8. The bottom shell 2 is installed in the lower open chamber and cooperates to form the valve core accommodating chamber 10 and the gas-liquid input chamber 8. The top cover 3 is installed in the upper open chamber and cooperates to form the exhaust chamber 9.

[0028] An exhaust passage 1023 is provided on the partition plate 102, and a sealing port 1024 matching the exhaust passage 1023 is provided on the surface of the partition plate 102 facing the valve core accommodating chamber 10, and the sealing port 1024 can be specifically an annular protrusion surrounding the exhaust passage 1023, so as to cooperate with the valve core assembly to achieve the sealing closure of the exhaust passage 1023. Among them, the housing body 101, the partition plate 102 and the above-mentioned output pipe 103 can be set to be integrally formed.

[0029] Furthermore, at least part of the partition plate 102 of the second plate area is configured to form a raised structure 1021, which is used to form an elevated chamber 801, that is, a step-like structure is provided on one side of the partition plate 102 to form an elevated chamber 801 with an opening facing downward.

[0030] Furthermore, at least part of the partition plate 102 of the second plate area is configured to form a concave structure 1022, which is used to cooperate with the top cover 3 to form a part of the exhaust cavity 9, that is, the concave area formed by the concave structure 1022 and facing the opening is the above-mentioned side end chamber 902.

[0031] Among them, the first plate area can be a circular area in the center of the partition plate 102, and the second plate area can be an annular area surrounding the central area. Then the horizontal cross-sections of the above-mentioned lifting structure 1021 and the end side chamber can be set to be fan-shaped, and the lifting structure 1021 and the end side chamber can be relatively arranged on both sides of the partition plate 102.

[0032] In this embodiment, the bottom shell 2 may specifically include a bottom plate 201 and a valve core accommodating shell 202 which are connected to each other.

[0033] The bottom plate 201 is configured to cover the lower open chamber. The valve core housing 202 is configured to extend into the lower open chamber, and the inner wall surface of the valve core housing 202 cooperates with the partition plate 102 and the bottom plate 201 to form the valve core housing chamber 10, and at least part of the outer wall surface of the valve core housing 202 cooperates with the outer shell body 101 to form the gas-liquid input chamber 8. Among them, at least one oil input channel 2021 and at least one gas input channel 2022 are opened on the valve core housing 202 to connect the valve core housing chamber 10 and the gas-liquid input chamber 8, and the oil input channel 2021 and the gas input channel 2022 are both located away from the gas-liquid input channel 1011.

[0034] Furthermore, an oil unloading hole connected to the valve core accommodating chamber 10 may be provided on the bottom plate 201 , and the size of the oil unloading hole only needs to be sufficient to allow the oil in the valve core accommodating chamber 10 to leak out into the fuel tank.

[0035] Furthermore, the valve core housing 202 and the portion of the housing body 101 corresponding to the lower opening chamber can be set to be circular or approximately circular, the cylindrical inner cavity in the valve core housing 202 is the valve core housing chamber 10, and the annular inner cavity between the valve core housing chamber 10 and the housing body 101 is the gas-liquid input chamber 8. In the installed state, the top of the valve core housing 202 is connected to the bottom surface of the first plate area corresponding to the partition plate 102. The oil input channel 2021 can be specifically set on the other side of the valve core housing 202 relative to the gas-liquid input channel 1011, and the opening of the oil input channel 2021 can extend to the bottom of the valve core housing chamber 10 (so that the oil can enter the valve core housing chamber 10 faster), that is, after the oil enters the gas-liquid input chamber 8 through the gas-liquid input channel 1011, it flows along the arc chambers on both sides toward the oil input channel 2021 located at the far end, and finally enters the valve core housing chamber 10. Specifically, one or two gas input channels 2022 may be provided, and the gas input channels 2022 may be provided in the area between the oil input channel 2021 and the gas-liquid input channel 1011, and may be specifically provided so that a line connecting the gas input channel 2022 and the center of the valve core accommodating chamber 10 and a line connecting the gas-liquid input channel 1011 and the center of the valve core accommodating chamber 10 form a 90° angle, so that when the gas enters the gas-liquid input chamber 8 through the gas-liquid input channel 1011, it will first hit the valve core accommodating shell 202 (to separate gas and liquid), and then flow toward the corresponding gas input channel 2022 through the arc-shaped chambers on both sides, and finally enter the valve core accommodating chamber 10 through the gas input channel 2022.

[0036] Furthermore, the connection between the bottom plate 201 and the shell body 101 can be a snap connection, that is, a plurality of bayonet holes arranged at intervals are provided on the bottom plate 201 , and a plurality of pairs of card blocks can be provided on the outer wall surface of the shell body 101 .

[0037] In this embodiment, the valve core assembly may specifically include a float 4, an elastic member 7 and a sealing assembly. The float 4 is slidably connected to the valve core accommodating chamber 10 along the height direction, and the two ends of the elastic member 7 are respectively connected to the float 4 and the valve core accommodating chamber 10. The sealing assembly is arranged at the top of the float 4, and is used to cooperate with the float 4 to open or close the exhaust channel 1023.

[0038] The sealing assembly may specifically include an elastic diaphragm 5 and at least one positioning member 6. The elastic diaphragm 5 is fixed to the top of the float 4 through the positioning member 6, and the elastic diaphragm 5 is configured to generate elastic deformation under the downward traction force formed by the float 4 in the height direction.

[0039] The elastic membrane 5 can be specifically configured to have two extended legs located at opposite sides, and the positioning member 6 can fix the corresponding extended legs to the top of the float 4 in a snap-fitting manner.

[0040] When the float 4 rises, the plane of the elastic diaphragm 5 fits the above-mentioned sealing port 1024, achieving sealing and closing the exhaust channel 1023. When the oil level in the fuel tank drops, and the gravity of the float 4 is greater than the sum of the buoyancy of the oil and the elastic force of the elastic member 7, the elastic film can tear the sealing connection with the sealing port 1024 by elastic deformation of its body, thereby realizing the rapid opening of the valve core. Moreover, compared with the existing plastic rotating valve plate solution, this diaphragm solution has a smaller thickness, so that the overall height of the valve can be further reduced; and the height occupied by the elastic diaphragm 5 solution is smaller than that of the bowl-shaped sealing member plus the rotating shaft valve plate in the existing solution, so that the sealing surface at the top of the valve core accommodating cavity can be further raised relative to the existing solution, thereby further increasing the closing height of the valve.

[0041] Furthermore, a protruding structure corresponding to the elastic diaphragm 5 is provided at the top of the float 4 , and the provision of the protruding structure can prevent the elastic diaphragm 5 from being adsorbed on the top of the float 4 .

[0042] In this embodiment, the FLVV valve may further include a welding piece for welding to the fuel tank, and the welding piece is snap-connected to the valve body.

[0043] The FLVV valve of this embodiment, through the design of the above-mentioned high-placed chamber 801, allows the oil inlet window (gas-liquid input channel 1011) to be set at 5 mm from the upper end surface of the valve as a whole, ensuring a higher closing height.

[0044] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A FLVV valve, characterized in that: Used to install on the fuel tank, define the oil lifting direction in the fuel tank as the height direction, including: A valve body, wherein the valve body is provided with a gas-liquid input chamber, a valve core accommodating chamber and an exhaust chamber which are connected in sequence; and the valve body is provided with a gas-liquid input channel which is connected with the gas-liquid input chamber and the inner chamber of the fuel tank, and the valve body is provided with an output pipe which is connected to the exhaust chamber; A valve core assembly is arranged in the valve core accommodating chamber, and the valve core assembly is configured to open or close an exhaust passage connecting the valve core accommodating chamber and the exhaust chamber; Among them, at least part of the gas-liquid input cavity is higher than the valve core accommodating cavity, and the area where the gas-liquid input cavity is higher than the valve core accommodating cavity is a high chamber; and at least part of the gas-liquid input channel is connected to the high chamber.

2. The FLVV valve according to claim 1, characterized in that The exhaust chamber comprises a top chamber and a side end chamber which are connected; The top chamber is arranged above the valve core accommodating chamber, and the top chamber is connected to the valve core accommodating chamber through the exhaust passage; the side end chamber is not higher than the top surface of the valve core accommodating chamber in the height direction; Wherein, at least part of the output pipe is connected to the connection interface of the valve body and communicates with the side end chamber.

3. The FLVV valve according to claim 1, characterized in that The valve body comprises an outer shell, a bottom shell and a top cover; The shell comprises a shell body and a partition plate arranged in the shell body, the partition plate divides the internal space of the shell body into an upper open chamber and a lower open chamber, and the partition plate comprises a first plate area corresponding to the valve core accommodating chamber and a second plate area corresponding to the gas-liquid input chamber; The bottom shell is installed in the lower opening chamber and cooperates to form the valve core accommodating chamber and the gas-liquid input chamber; the top cover is installed in the upper opening chamber and cooperates to form the exhaust chamber; Wherein, the exhaust passage is provided on the partition plate, and a sealing port matching the exhaust passage is provided on the surface of the partition plate facing the valve core accommodating cavity.

4. The FLVV valve according to claim 3, characterized in that At least a portion of the partition plate of the second plate region is configured to form an elevated structure, and the elevated structure is used to form the elevated chamber.

5. The FLVV valve according to claim 3, characterized in that: At least a portion of the partition plate of the second plate area is configured to form a concave structure, and the concave structure is used to cooperate with the top cover to form a portion of the exhaust cavity.

6. The FLVV valve according to claim 3, characterized in that The bottom shell comprises a bottom plate and a valve core accommodating shell connected to each other; The bottom plate is configured to cover the lower opening chamber; the valve core accommodating shell is configured to extend into the lower opening chamber, the inner wall surface of the valve core accommodating shell cooperates with the partition plate and the bottom plate to form the valve core accommodating chamber, and at least a portion of the outer wall surface of the valve core accommodating shell cooperates with the outer shell body to form the gas-liquid input chamber; Among them, at least one oil input channel and at least one gas input channel connecting the valve core accommodating chamber and the gas-liquid input chamber are provided on the valve core accommodating shell, and the oil input channel and the gas input channel are both located away from the gas-liquid input channel.

7. The FLVV valve according to claim 1, characterized in that The valve core assembly includes a float, an elastic member and a sealing assembly; The float is slidably connected to the valve core accommodating cavity along the height direction, and the two ends of the elastic member are respectively connected to the float and the valve core accommodating cavity; the sealing component is arranged at the top of the float, and is used to cooperate with the float to open or close the exhaust channel.

8. The FLVV valve according to claim 7, characterized in that The sealing assembly includes an elastic diaphragm and at least one positioning member; The elastic diaphragm is fixed to the top of the float through the positioning member, and the elastic diaphragm is configured to generate elastic deformation under the downward traction force formed by the float in the height direction.

9. The FLVV valve according to claim 8, characterized in that The top of the float is provided with a protruding structure corresponding to the elastic diaphragm.

10. The FLVV valve according to claim 1, characterized in that It also includes a welding piece for welding to the fuel tank, and the welding piece is snap-connected to the valve body.

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