A combined control valve for an automobile fuel tank

Abstract

This invention discloses a combined control valve for automotive fuel tanks, within the field of automotive parts. The valve includes a flange with a receiving cavity containing an oil-gas separator. The oil-gas separator comprises an isolation plate, a base plate, and a circular boss, dividing the receiving cavity into an exhaust chamber and a liquid accumulation chamber. A valve body shell is located below the base plate, engaging with the oil-gas separator to form a combined control valve chamber. This combined control valve chamber includes a level control valve chamber and a tipper valve chamber, each containing a level control valve core and a tipper valve core, respectively. A level control valve exhaust port is located on the base plate corresponding to the level control valve core, an exhaust port for the liquid accumulation chamber is located on the isolation plate, and a tipper valve exhaust port is located on the circular boss corresponding to the tipper valve core. The exhaust chamber is connected to at least one exhaust pipe. This invention enables oil vapor-liquid separation in the fuel tank, preventing dynamic fuel leakage into the carbon canister during vehicle operation and reducing fuel tank emissions.

Description

Technical Field

[0001] This invention belongs to the field of automotive parts technology, and specifically relates to a combination control valve for automotive fuel tanks. Background Technology

[0002] Volatile organic compounds (VOCs) are a major factor affecting ambient ozone levels and are also important precursors to secondary organic aerosols. Controlling VOC pollution is crucial for controlling air pollution in major Chinese cities. Besides industrial emissions, hydrocarbon emissions from automobiles are also a major source of VOC emissions.

[0003] HC emissions from automobiles come not only from engine exhaust and fuel evaporation, but also from CH emissions generated during refueling. While advancements in engine emission control and EVAP (Electric Vehicle Access Assist) technology have effectively controlled HC emissions from exhaust and fuel evaporation, HC emissions from fuel evaporation during refueling can no longer be ignored.

[0004] To meet the China VI emission standards, the car is equipped with an on-board refueling vapor recovery (ORVR) system. The ventilation pipe transports the oil vapor generated during refueling to the charcoal canister for adsorption. When the engine is running, the oil vapor in the charcoal canister is desorbed and sent to the intake manifold to participate in combustion.

[0005] Vehicles equipped with ORVR typically use both a filler valve and a rollover valve on their fuel tanks. In the prior art, there is a novel combined valve for automotive fuel tanks, with patent application number: 202010625710.9; Application Date: 2020-07-02; Publication Number: CN111609198A; Publication Date: 2020-09-01; This combination valve integrates the fuel filler valve and the rollover valve into a single assembly. It prevents fuel from dynamically leaking into the carbon canister through a built-in accumulator chamber. However, its drawback is that the capacity of the accumulator chamber is solely determined by the height of the exhaust outlet. Increasing the exhaust outlet height to increase the fuel capacity hinders the smooth discharge of fuel vapors. If the exhaust outlet height is set too low and the fuel level in the tank is high, the vehicle may experience vertical bumps or tilting during driving, causing fuel to slowly seep into the carbon canister. Over time, this accumulation leads to a large amount of fuel stored in the carbon canister, resulting in excessively high fuel concentration. When the carbon canister solenoid valve opens, the high concentration of fuel vapor enters the engine, causing black smoke or even engine stalling. Summary of the Invention

[0006] The purpose of this invention is to provide a combined control valve for an automotive fuel tank, which separates oil vapor and liquid in the fuel tank, prevents dynamic leakage of fuel into the carbon canister during vehicle operation, and reduces fuel tank emissions.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution: A combined control valve for an automotive fuel tank, comprising a flange, the flange comprising a receiving cavity, an oil-gas separator disposed within the receiving cavity, the oil-gas separator comprising an isolation plate, a base plate, and a circular boss, dividing the receiving cavity into an exhaust cavity and a liquid accumulation cavity, a valve body shell disposed below the base plate, the valve body shell engaging with the oil-gas separator to form a combined control valve cavity, the combined control valve cavity comprising a level control valve cavity and a tipper valve cavity, a level control valve core and a tipper valve core respectively disposed within the level control valve cavity and the tipper valve cavity, a level control valve exhaust hole disposed on the base plate corresponding to the level control valve core, an exhaust hole for the liquid accumulation cavity disposed on the isolation plate, and a tipper valve exhaust hole disposed within the circular boss corresponding to the tipper valve core, the exhaust cavity being connected to at least one exhaust pipe.

[0008] With the structure of this invention, when the fuel nozzle fills the fuel tank, the liquid level in the tank continuously rises. At this time, the liquid level control valve core detaches from the base plate under its own gravity, and the tipper valve core detaches from the circular boss under its own gravity. The oil vapor in the tank enters the flange's vent chamber through the vent hole of the liquid level control valve and the vent hole of the accumulating liquid chamber. The diameter of the tipper valve vent hole is much smaller than that of the control valve vent hole, so the vent flow rate is small and negligible compared to the vent volume of the tipper valve vent hole. A small portion of the oil vapor is transported to the circulation pipe of the fuel filling pipe for recirculation through the vent pipe connected to the flange; another portion is transported to the charcoal canister for adsorption. When the liquid level in the tank continues to rise until gasoline enters the liquid level control valve chamber, the liquid level control valve core is affected by the oil... Buoyancy overcomes its own weight and rises until the top and bottom plates form a sealing surface. The fuel vapors inside the tank cannot escape, causing the pressure inside the tank to rise, and the refueling nozzle stops. After the first nozzle stop, the level control valve is closed, and the fuel vapors in the tank can be discharged through the vent hole of the tip-over valve. At this time, refueling can be added to the tank. When the vehicle is in a bumpy state or even rolls over, the fuel vapors in the tank rush into the liquid accumulation chamber through the vent hole of the level control valve. The gas first enters the venting chamber through the vent hole of the liquid accumulation chamber and is discharged along a certain path, while the liquid temporarily remains in the liquid accumulation chamber, thus preventing the liquid from entering the charcoal canister. When the vehicle reaches a stable state, the liquid inside the liquid accumulation chamber flows back into the fuel tank through the vent hole of the level control valve, ensuring the normal operation of subsequent venting.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: the liquid level control valve and the tipper valve in the combined valve can be connected to the circulation pipe and the charcoal canister simultaneously. During refueling, most of the oil vapor in the fuel tank is discharged into the charcoal canister through the vent hole of the liquid level control valve and the vent hole of the accumulator chamber and is adsorbed. A small portion of the oil vapor is transported to the refueling pipe through the circulation pipe to achieve vapor recirculation, thereby reducing the workload of the charcoal canister. The vent pipe of the flange eliminates the need for an additional pipeline connection between the liquid level control valve and the tipper valve, thereby reducing the penetration of HC at the fuel tank opening. The volume of the accumulator chamber is fixed and is not affected by the vent hole of the accumulator chamber. The vent hole of the accumulator chamber is located above the accumulator chamber and is offset from the vent hole of the tipper valve, which can effectively prevent the dynamic leakage of fuel liquid into the charcoal canister.

[0010] As a further improvement of the present invention, an arc-shaped baffle is provided around the vent hole of the liquid accumulation cavity on the isolation plate, and vent ports of the liquid accumulation cavity are provided on both sides of the arc-shaped baffle. The height of the plane where the vent ports of the liquid accumulation cavity are located is higher than the height of the plane where the isolation plate is located.

[0011] As a further improvement of the present invention, the circular boss includes an upper boss and a lower boss, the lower boss is disposed between the partition plate and the bottom plate, the upper side of the upper boss abuts against the inner wall of the flange, the outer periphery of the upper boss is provided with a tipper valve exhaust port, and the diameter of the upper boss is smaller than the diameter of the lower boss.

[0012] As a further improvement of the present invention, the isolation plate includes an irregularly shaped plate arranged parallel to the base plate, and a first baffle wall, a second baffle wall, and a third baffle wall arranged perpendicular to the base plate. The lower sides of the first baffle wall and the second baffle wall are both connected to the base plate. A gap is left between the upper side of the first baffle wall and the inner wall of the flange. The upper side of the second baffle wall is connected to the irregularly shaped plate. The lower side of the third baffle wall is connected to the irregularly shaped plate. The upper side of the third baffle wall abuts against the inner wall of the flange. The inward-facing side of the first baffle wall, the second baffle wall, and the third baffle wall are all connected to a circular boss. The outward-facing side of the first baffle wall and the second baffle wall abuts against the inner wall of the flange. A gap is left between the outward-facing side of the third baffle wall and the inner wall of the flange.

[0013] As a further improvement of the present invention, at least one pair of mounting ears are provided on the lower side of the base plate corresponding to the valve body shell, the mounting ears are provided with slots, and the valve body shell is provided with buckles corresponding to the slots.

[0014] As a further improvement of the present invention, a top cover is provided on the outside of the flange, and the top cover is provided with a pipe thread that is adapted to the size of the exhaust pipe.

[0015] As a further improvement of the present invention, at least one oil inlet is provided on the outer periphery of the valve body shell corresponding to the liquid level control valve cavity, and at least one oil inlet hole is provided on the bottom of the valve body shell corresponding to the tipper valve cavity.

[0016] As a further improvement of the present invention, a valve inner shell is provided inside the valve body shell corresponding to the liquid level control valve cavity, a gap is left between the outer wall of the valve inner shell and the inner wall of the valve body shell, the lower side of the valve inner shell is connected to the valve body shell, and a gap is left between the upper side of the valve inner shell and the bottom plate.

[0017] As a further improvement of the present invention, a liquid level control guide seat is provided at the center of the liquid level control valve cavity corresponding to the valve body shell. The liquid level control valve core includes a liquid level control float and a liquid level control sealing assembly. The liquid level control float includes a fixing groove and a limiting step. A liquid level control spring is provided in the fixing groove. The lower end of the liquid level control spring is sleeved on the liquid level control guide seat. The liquid level control sealing assembly includes a sealing sleeve and a sealing cover. The sealing sleeve is sleeved on the limiting step. The sealing cover is located at the top of the limiting step. A plurality of guide posts are provided around the sealing sleeve on the bottom plate. A sealing groove is provided on the bottom plate corresponding to the sealing cover. A plurality of guide ribs are provided around the liquid level control float on the inner shell of the valve body. A guide groove is provided on the liquid level control float corresponding to the guide ribs.

[0018] As a further improvement of the present invention, a tipping guide seat is provided at the center of the tipping valve cavity corresponding to the valve body shell. The tipping valve core includes a tipping float, and the tipping float includes an installation groove. A tipping spring is provided in the installation groove. The lower end of the tipping spring is sleeved on the tipping guide seat. The top of the tipping float has an inclined structure and is provided with a sealing element parallel to the inclined surface. A sealing gasket is sleeved at the highest point of the sealing element. An inclined boss that cooperates with the sealing element is provided at the center of the circular boss. Several guide strips are provided around the tipping valve core on both the valve body shell and the circular boss. A limit groove is provided on the tipping float corresponding to the guide strip. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of a preferred embodiment of the present invention.

[0020] Figure 2 This is a three-dimensional structural diagram of a preferred embodiment of the present invention.

[0021] Figure 3 This is a front view of a preferred embodiment of the present invention.

[0022] Figure 4 for Figure 3 Sectional view at point AA.

[0023] Figure 5 for Figure 3 Sectional view at point BB.

[0024] Figure 6 This is a three-dimensional structural diagram of the oil-gas separator according to a preferred embodiment of the present invention. Figure 1 .

[0025] Figure 7 This is a three-dimensional structural diagram of the oil-gas separator according to a preferred embodiment of the present invention. Figure 2 .

[0026] Figure 8 This is a top view of the valve body housing according to a preferred embodiment of the present invention.

[0027] Among them, 1 flange, 101 exhaust pipe, 102 first exhaust pipe, 103 second exhaust pipe, 2 isolation plate, 201 vent hole for liquid accumulation chamber, 202 return hole, 203 irregular plate, 204 first baffle, 205 second baffle, 206 third baffle, 3 base plate, 301 control valve vent, 4 circular boss, 401 tipper valve vent, 402 upper boss, 403 lower boss, 404 tipper valve vent, 405 inclined boss, 5 exhaust chamber, 6 liquid accumulation chamber, 7 valve body shell, 701 oil inlet, 702 oil inlet hole, 703 buckle, 704 liquid level control guide seat, 705 tipper guide seat 706 Guide bar, 8 Top cover, 801 Pipe thread, 9 Arc-shaped baffle, 901 Liquid accumulation chamber vent, 10 Mounting ear, 1001 Slot, 11 Valve body shell, 1101 Guide rib, 12 Liquid level control float, 1201 Positioning groove, 1202 Limiting step, 1203 Guide groove, 1204 Hook, 13 Liquid level control spring, 14 Sealing sleeve, 1401 Snap ring, 15 Sealing cover, 16 Guide column, 17 Tilting float, 1701 Mounting groove, 1702 Limiting groove, 18 Tilting spring, 19 Seal, 20 Sealing gasket cover, 21 Head valve, 22 Baffle plate, 23 Drain plate, 24 Vent. Detailed Implementation

[0028] Example 1

[0029] like Figure 1As shown, a combination control valve for an automotive fuel tank includes a flange 1. The flange 1 includes a receiving cavity, within which an oil-gas separator is installed. The oil-gas separator includes a partition plate 2, a base plate 3, and a circular boss 4, dividing the receiving cavity into an exhaust cavity 5 and a liquid accumulation cavity 6. A valve body shell 7 is located below the base plate 3. The valve body shell 7 engages with the oil-gas separator to form a combination control valve cavity, which includes a level control valve cavity and a rollover valve cavity. Three oil inlets 701, positioned at the same horizontal level, are located on the outer periphery of the valve body shell 7 corresponding to the level control valve cavity. These oil inlets 701 also serve as inlets for oil vapor. The valve body shell 7 can be adjusted... The position of the oil inlet 701 can precisely control the liquid level height when the initial gun stops; four oil inlets 702 are provided at the bottom of the valve body shell 7 corresponding to the tipper valve chamber; a liquid level control valve core and a tipper valve core are respectively provided in the liquid level control valve chamber and the tipper valve chamber; a liquid level control valve vent 301 is provided on the bottom plate 3 corresponding to the liquid level control valve core; a liquid accumulation chamber vent 201 and a sinking return liquid hole 202 are provided on the isolation plate 2; a tipper valve vent 401 is provided in the circular boss 4 corresponding to the tipper valve core; an exhaust pipe 101 is connected to the outer periphery of the exhaust chamber 5, and the exhaust pipe 101 is connected to the charcoal canister.

[0030] Example 2

[0031] like Figure 2-5 As shown, another preferred embodiment of a combined control valve for an automotive fuel tank is provided. The difference from the first embodiment is that: a first exhaust pipe 102 is connected to the outer periphery of the exhaust chamber 5, and a second exhaust pipe 103 is connected to the outer periphery of the receiving chamber. The diameter of the second exhaust pipe 103 is much larger than the diameter of the first exhaust pipe 102. The outer end of the first exhaust pipe 102 is connected to the circulation pipe, and the outer end of the second exhaust pipe 103 is connected to the charcoal canister. A top cover 8 is provided on the outside of the flange 1. The top cover 8 is provided with pipe threads 801 that are adapted to the size of the corresponding exhaust pipes for both the first exhaust pipe 102 and the second exhaust pipe 103. The pipe threads 801 can ensure that the connection between the exhaust pipe and the external components is tight and firm, and prevent leakage.

[0032] In one specific embodiment of the present invention, a head valve 21 is provided on the upper side of the tipper valve exhaust hole 401 inside the circular boss 4 to maintain the pressure balance inside the oil tank.

[0033] The following is combined with Figure 6 and Figure 7The oil-gas separator of the present invention will be described in detail. An arc-shaped baffle 9 is provided on the isolation plate 2 around the vent hole 201 of the liquid accumulation chamber. Vent holes 901 for the liquid accumulation chamber are provided on both sides of the arc-shaped baffle 9. The height of the plane containing the vent holes 901 is higher than the height of the plane containing the isolation plate 2, which can prevent oil from entering the vent chamber 5. The circular boss 4 includes an upper boss 402 and a lower boss 403. The lower boss 403 is located between the isolation plate 2 and the bottom plate 3. The upper side of the upper boss 402 abuts against the inner wall of the flange 1. The diameter of the upper boss 402 is smaller than the diameter of the lower boss 403. A tipper valve exhaust port 404 is provided on the outer periphery of the upper boss 402, located on the side near the arc-shaped retaining wall 9. The isolation plate 2 includes a shaped plate 203 parallel to the base plate 3, and a first retaining wall 204, a second retaining wall 205, and a third retaining wall 206 perpendicular to the base plate 3. The lower sides of the first retaining wall 204 and the second retaining wall 205 are connected to the base plate 3. A gap is left between the upper side of the first retaining wall 204 and the inner wall of the flange 1. The second retaining wall... The upper side of the third baffle 205 is connected to the shaped plate 203, and the lower side of the third baffle 206 is connected to the shaped plate 203. The upper side of the third baffle 206 abuts against the inner wall of the flange 1. The inward-facing sides of the first baffle 204, the second baffle 205, and the third baffle 206 are all connected to the circular boss 4. The outward-facing sides of the first baffle 204 and the second baffle 205 abut against the inner wall of the flange 1. A gap is left between the outward-facing side of the third baffle 206 and the inner wall of the flange 1. The shaped plate 203 corresponds to this gap and is aligned with the vent 90 of the liquid accumulation chamber. A baffle plate 22 is provided between the first baffle wall 204 and the arc-shaped baffle wall 9 on the irregular plate 203. To improve the exhaust efficiency, exhaust ports 24 can be provided on both sides of the third baffle wall 206. Two pairs of mounting ears 10 are provided on the lower side of the bottom plate 3 corresponding to the valve body shell 7. The mounting ears 10 are reduced from top to bottom. The mounting ears 10 are provided with a slot 1001. The valve body shell 7 is provided with a buckle 703 corresponding to the slot 1001, which can realize the quick assembly of the valve body shell 7 and the oil-gas separator.

[0034] In this embodiment, the liquid level control valve adopts a double-wall structure, as detailed below. Figure 8 A valve body inner shell 11 is provided inside the valve body outer shell 7 corresponding to the liquid level control valve cavity. There is a gap between the outer wall of the valve body inner shell 11 and the inner wall of the valve body outer shell 7. The lower side of the valve body inner shell 11 is connected to the valve body outer shell 7, and there is a gap between the upper side of the valve body inner shell 11 and the bottom plate 3.

[0035] According to some embodiments of the present invention, a level control guide seat 704 is provided at the center of the level control valve cavity corresponding to the valve body housing 7. The level control valve core includes a level control float 12 and a level control sealing assembly. The level control float 12 includes a fixing groove and a limiting step 1202. A level control spring 13 is provided in the fixing groove. The lower end of the level control spring 13 is sleeved on the level control guide seat 704. The level control sealing assembly includes a sealing sleeve 14 and a sealing cover 15. The sealing sleeve 14 is sleeved on the limiting step 1202. Preferably, the sealing sleeve 14... A retaining ring 1401 is provided on the outer side of the valve body 4, and a hook 1204 is provided on the upper side of the level control float 12. The hook 1204 and the retaining ring 1401 can further fix the sealing sleeve 14 to prevent it from moving. The sealing cover 15 is provided on the top of the limiting step 1202. The bottom plate 3 is provided with several guide posts 16 around the sealing sleeve 14. The valve body shell 11 is provided with several guide ribs 1101 around the level control float 12. The level control float 12 is provided with a guide groove 1203 corresponding to the guide ribs 1101, which can ensure that the level control float 12 moves up and down along its axis.

[0036] According to some embodiments of the present invention, a tipping guide seat 705 is provided at the center of the tipping valve cavity corresponding to the valve body shell 7. The tipping valve core includes a tipping float 17, which includes a mounting groove 1701. A tipping spring 18 is provided in the mounting groove 1701. The lower end of the tipping spring 18 is sleeved on the tipping guide seat 705. The top of the tipping float 17 has a sloping structure and is provided with a sealing element 19 parallel to the sloping surface. A sealing gasket cover 20 is sleeved at the highest point of the sealing element 19. A sloping boss 405 that cooperates with the sealing element 19 is provided at the center of the circular boss 4. The sloping design allows the sealing element 19 to fit better with the sloping boss 405, thereby improving its stability and preventing leakage caused by shaking of the sealing surface. Several guide strips 706 are provided around the tipping valve core of both the valve body shell 7 and the circular boss 4. Limiting grooves 17021201 are provided on the tipping float 17 corresponding to the guide strips 706.

[0037] The working principle of this invention is as follows: When the fuel nozzle fills the fuel tank, the liquid level in the tank rises continuously. At this time, the liquid level control float 12, under its own weight and the force of the liquid level control spring 13, causes the sealing cover 15 to separate from the shell. The oil vapor in the tank enters the exhaust chamber 5 of the flange 1 through the exhaust port 301 of the liquid level control valve and the exhaust port 201 of the liquid accumulation chamber. The diameter of the exhaust port 401 of the tipper valve is much smaller than that of the control valve exhaust port 301, so the exhaust flow rate is small and can be ignored compared with the exhaust volume of the tipper valve exhaust port 401. A small part of the oil vapor is sent to the circulation pipe of the fuel filling pipe for recirculation through the first exhaust pipe 102, and the other part is transported to the carbon canister through the second exhaust pipe 103 to be adsorbed. As the fuel level in the tank continues to rise until gasoline enters the level control valve chamber through the inlet 701, the level control float 12 rises against its own weight and the force of the level control spring 13 due to the buoyancy of the fuel. This rises until the sealing cap 15 and the vent hole 301 of the level control valve form a sealing surface. The fuel vapor in the tank cannot be discharged, causing the pressure inside the tank to rise, and the fuel nozzle stops. After the first dispensing, the level control valve is closed, and the fuel vapor in the tank can be discharged through the tipper valve vent hole 401 and the tipper valve vent port 404. At this time, the fuel can be refilled. The head valve 21 above the vent hole keeps the internal pressure of the fuel tank stable to control excessive refilling. When the car is driving on a bumpy road, the fuel vapor in the tank flows into the accumulator 6 through the vent 301 of the level control valve. The vapor first enters the exhaust chamber 5 through the vent 201 of the accumulator 6 and is discharged along a certain path, while the liquid is temporarily stored in the accumulator 6, thus preventing the liquid from entering the charcoal canister. When the vehicle is in a stable state, the liquid inside the accumulator 6 flows back into the fuel tank through the vent 301 of the level control valve, ensuring the normal operation of subsequent exhaust. When the car overturns, some gasoline in the accumulator 6 may flow out through the vent 201 of the accumulator 6. Under the action of the arc-shaped baffle 9, most of the oil is blocked and flows back to the bottom of the accumulator 6. A small amount of oil flows into the exhaust chamber 5. After being further blocked by the baffle plate 22 and the third baffle 206, it cannot flow into the second exhaust pipe 103, and instead flows along the guide plate 23 to the return hole 202 and back into the accumulator 6.

[0038] The advantages of this invention are as follows: the fuel tank is connected to the charcoal canister using this combined control valve, and a circulation pipe forms a passage to the refueling pipe. By adding a CVS (Canister Vent Solenoid), the opening and closing control of the charcoal canister's vent can be realized, supporting the monitoring of the airtightness of the entire system. The design of the built-in oil-gas separator in flange 1 can effectively prevent dynamic leakage of fuel liquid into the charcoal canister, reducing production costs compared to an external liquid collector. The level control valve, tipper valve, and gasoline separator are integrated into one body inserted into flange 1, eliminating the need for connecting nylon pipes between valve bodies, reducing the number of openings in the fuel tank and lowering the overall cost of the fuel tank. At the same time, the closing height of the built-in control valve and tipper valve can be flexibly adjusted according to different rated refueling and exhaust volume requirements.

[0039] This invention is not limited to the above embodiments. Based on the technical solutions disclosed in this invention, those skilled in the art can make some substitutions and modifications to some of the technical features without creative effort, and all such substitutions and modifications are within the protection scope of this invention.

Claims

1. A combination control valve for an automotive fuel tank, characterized in that, The device includes a flange, which has a receiving cavity. An oil-gas separator is installed within the receiving cavity. The oil-gas separator includes a partition plate, a base plate, and a circular boss, dividing the receiving cavity into an exhaust chamber and a liquid accumulation chamber. A valve body shell is located below the base plate. The valve body shell engages with the oil-gas separator to form a combined control valve chamber. The combined control valve chamber includes a level control valve chamber and a tipper valve chamber. A level control valve core and a tipper valve core are respectively installed in the level control valve chamber and tipper valve chamber. A level control valve exhaust port is provided on the base plate corresponding to the level control valve core. An exhaust port for the liquid accumulation chamber is provided on the partition plate. A tipper valve exhaust port is provided within the circular boss corresponding to the tipper valve core. The exhaust chamber is connected to at least one exhaust pipe; the isolation plate includes a shaped plate parallel to the base plate, and a first baffle, a second baffle, and a third baffle perpendicular to the base plate. The lower sides of the first and second baffles are connected to the base plate. A gap is left between the upper side of the first baffle and the inner wall of the flange. The upper side of the second baffle is connected to the shaped plate. The lower side of the third baffle is connected to the shaped plate. The upper side of the third baffle abuts against the inner wall of the flange. The inward-facing sides of the first, second, and third baffles are all connected to a circular boss. The outward-facing sides of the first and second baffles abut against the inner wall of the flange. A gap is left between the outward-facing side of the third baffle and the inner wall of the flange.

2. The automotive fuel tank combination control valve according to claim 1, characterized in that, An arc-shaped baffle is provided around the vent hole of the liquid accumulation chamber on the isolation plate, and vent ports of the liquid accumulation chamber are provided on both sides of the arc-shaped baffle. The height of the plane where the vent ports of the liquid accumulation chamber are located is higher than the height of the plane where the isolation plate is located.

3. The automotive fuel tank combination control valve according to claim 1, characterized in that, The circular boss includes an upper boss and a lower boss. The lower boss is disposed between the partition plate and the base plate. The upper side of the upper boss abuts against the inner wall of the flange. A tipper valve exhaust port is provided on the outer periphery of the upper boss. The diameter of the upper boss is smaller than the diameter of the lower boss.

4. The automotive fuel tank combination control valve according to claim 1, characterized in that, The bottom plate has at least one pair of mounting ears on the lower side corresponding to the valve body shell. The mounting ears are provided with slots, and the valve body shell is provided with buckles corresponding to the slots.

5. A combined control valve for an automotive fuel tank according to claim 1, characterized in that, The flange is provided with a top cover on the outside, and the top cover is provided with a pipe thread that matches the size of the exhaust pipe.

6. The automotive fuel tank combination control valve according to claim 1, characterized in that, The outer periphery of the valve body shell is provided with at least one oil inlet corresponding to the liquid level control valve cavity, and the bottom of the valve body shell is provided with at least one oil inlet corresponding to the tipper valve cavity.

7. The automotive fuel tank combination control valve according to claim 1, characterized in that, The valve body housing is provided with a valve inner shell corresponding to the liquid level control valve cavity. There is a gap between the outer wall of the valve inner shell and the inner wall of the valve body housing. The lower side of the valve inner shell is connected to the valve body housing, and there is a gap between the upper side of the valve inner shell and the bottom plate.

8. A combined control valve for an automotive fuel tank according to claim 7, characterized in that, The valve body shell is provided with a level control guide seat at the center of the level control valve cavity. The level control valve core includes a level control float and a level control sealing assembly. The level control float includes a fixing groove and a limiting step. A level control spring is provided in the fixing groove. The lower end of the level control spring is sleeved on the level control guide seat. The level control sealing assembly includes a sealing sleeve and a sealing cover. The sealing sleeve is sleeved on the limiting step. The sealing cover is located at the top of the limiting step. A number of guide posts are provided around the sealing sleeve on the base plate. A sealing groove is provided on the base plate corresponding to the sealing cover. A number of guide ribs are provided around the level control float on the inner shell of the valve body. A guide groove is provided on the level control float corresponding to the guide ribs.

9. A combined control valve for an automotive fuel tank according to any one of claims 1-8, characterized in that, The valve body shell is provided with a tipping guide seat at the center of the tipping valve cavity. The tipping valve core includes a tipping float, and the tipping float includes a mounting groove. A tipping spring is provided in the mounting groove. The lower end of the tipping spring is sleeved on the tipping guide seat. The top of the tipping float has an inclined structure and is provided with a sealing element parallel to the inclined surface. A sealing gasket is sleeved at the highest point of the sealing element. An inclined boss that cooperates with the sealing element is provided at the center of the circular boss. Several guide strips are provided around the tipping valve core on both the valve body shell and the circular boss. The tipping float is provided with a limit groove corresponding to the guide strip.

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