Combination valve with oil-gas separation function

Abstract

The invention discloses a combination valve with an oil-gas separation function in the field of fuel tanks, which comprises a refueling control valve, a rollover valve and a welding flange, the welding flange comprises a first exhaust cavity, a second exhaust cavity, an exhaust channel and an exhaust pipe, the first exhaust cavity is used for accommodating an oil-gas separator and a control valve cover of the refueling control valve, and the second exhaust cavity is used for accommodating an oil-gas separator; the second exhaust cavity is used for installing a rollover valve, the exhaust channel is used for communicating the first exhaust cavity with the second exhaust cavity, the oil-gas separator comprises an arch-shaped supporting top, an inner arc-shaped flow blocking wall, an outer arc-shaped flow blocking wall and two outer arc-shaped flow guide walls which are symmetrically distributed, and a liquid storage cavity is formed among the inner arc-shaped flow blocking wall, the outer arc-shaped flow blocking walls and the control valve cover; the two outer arc-shaped flow guide walls are used for guiding liquid to the liquid storage cavity, exhaust windows used for communicating the liquid storage cavity with the exhaust pipe are formed in the outer arc-shaped flow baffle walls, and the arched supporting top is used for guiding the gas exhaust direction. The dynamic leakage function of the valve can be effectively improved, and the valve has the advantages of being simple in structure and low in maintenance cost.

Description

Technical Field

[0001] The invention belongs to the technical field of fuel tanks, and in particular relates to a combined valve with oil-gas separation function. Background Art

[0002] The combination valve is an integrated device with unloading, safety, and check functions. It combines multiple valves used on automobile fuel tanks. It has the advantages of high integration, small size, and compact structure. Therefore, it is widely used in automobile fuel supply devices.

[0003] In the prior art, a new type of combined valve for automobile fuel tanks is disclosed, with the authorization number: CN111609198B; application date: 2020-07-02; authorization date: 2024-08-23, comprising a liquid storage cavity plate, an upper shell, and a valve body shell. The surface of the liquid storage cavity plate is provided with a main exhaust hole and a second exhaust hole, and the main exhaust hole and the second exhaust hole are respectively provided in the thickness direction of the liquid storage cavity plate. The upper part of the liquid storage cavity plate is encapsulated with the upper shell, and the bottom of the liquid storage cavity plate is encapsulated with the valve body shell. The valve body shell forms a liquid level closing valve cavity corresponding to the lower area of ​​the main exhaust hole, and the valve body shell forms an exhaust valve cavity corresponding to the lower area of ​​the second exhaust hole, and the upper shell is provided with a side convex air outlet. The liquid storage cavity is formed by the upper area of ​​the main exhaust hole of the unique liquid storage cavity plate to prevent the dynamic leakage of fuel liquid into the carbon canister. Its disadvantage is that the valve cover of the control valve and the valve cover of the exhaust valve are integrated on the liquid storage cavity plate, which makes its structure more complicated and increases the difficulty of manufacturing the liquid storage cavity plate. If the liquid storage cavity plate or any valve fails, both valves cannot be used normally, and the maintenance cost is high. Summary of the invention

[0004] The purpose of the present invention is to provide a combined valve with oil-gas separation function, in which the oil-gas separator and the two-functional valve are separately arranged, so that the functions of the two valves can be realized more reliably and are beneficial to oil-gas separation.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: A combination valve with oil-gas separation function, including a refueling control valve, a rollover valve and a welding flange, the welding flange including a first exhaust chamber, a second exhaust chamber, an exhaust channel and an exhaust pipe, the first exhaust chamber is used to accommodate the oil-gas separator and the control valve cover of the refueling control valve, the second exhaust chamber is used to install the rollover valve, the exhaust channel is used to connect the first exhaust chamber and the second exhaust chamber, the oil-gas separator includes an arched support top, an inner arc baffle wall, an outer arc baffle wall, and two outer arc guide walls symmetrically distributed on each other, a liquid storage chamber is formed between the inner arc baffle wall, the outer arc baffle wall and the control valve cover, the two outer arc guide walls are used to drain liquid to the liquid storage chamber, the outer arc baffle wall is provided with an exhaust window for connecting the liquid storage chamber and the exhaust pipe, and the arched support top is used to guide the gas discharge direction.

[0006] When the present invention is in use, the exhaust pipe is connected with the charcoal canister, and when the liquid level in the fuel tank rises to the controlled height, the refueling control valve is automatically closed, the pressure in the fuel tank increases, the refueling gun jumps and stops refueling; after the first jump, the liquid level control valve is in a closed state, and the refueling operation of the refueling gun can be completed by exhausting the gas through the rollover valve; when the car is driving on mountain roads, off-road, etc., the oil gas and oil in the fuel tank overflow from the valve port of the refueling control valve, and the oil enters the liquid storage chamber for temporary storage under the blocking effect of the inner arc baffle wall and the guiding effect of the outer arc guide wall, and the oil-gas mixture During the rising process, the mass continuously hits the inner arc baffle wall, the outer arc baffle wall and the outer arc guide wall, and is blocked by the arched support top to achieve oil and gas separation. The separated liquid falls along the wall and is guided to the liquid storage chamber by the outer arc guide wall. Under the guidance of the arched support top, the separated gas is divided into two paths and enters the carbon canister from the exhaust pipe along the path planned between the walls. After being adsorbed by the carbon canister, it is discharged into the atmosphere to reduce emissions. After the float of the FLVV (fueling control valve) falls back, the liquid returns to the fuel tank through the fueling control valve.

[0007] Compared with the prior art, the beneficial effects of the present invention are as follows: a liquid storage chamber is formed by the oil-gas separator and the control valve cover, so that dynamic leakage of oil into the charcoal canister is avoided, the adsorption effect of the charcoal canister is ensured, and the air pollution of fuel vapor is effectively reduced; the arched support top can effectively disperse and bear the pressure on the valve, improve the structural strength of the oil-gas separator, and compared with the flat top structure, the oil can quickly slide down along the inner wall of the support top, thereby improving the liquid collection effect of the oil-gas separator; when the car is turned over, the arched support top can be used as a temporary liquid accumulator to temporarily store excess oil, which can effectively prevent the oil from continuing to leak and reduce environmental pollution and fire risks; the oil-gas separator, the refueling control valve and the rollover valve are separately arranged on the welding flange, and the two valves work relatively independently, thereby ensuring the reliability of their own work. When any valve or the oil-gas separator is damaged, the corresponding parts can be directly replaced, which reduces the maintenance cost; the oil-gas separator is suitable for most refueling control valves with a predetermined structure, and the size of the oil-gas separator can be adjusted according to the size of the control valve cover, so that it has higher use value and commercial value.

[0008] As a further improvement of the technical solution of the present invention, a guide strip is provided on the side of the outer arc-shaped guide wall facing the exhaust channel, and a plug-in strip is provided on the lower side of the guide strip. The guide strip and the outer arc-shaped guide wall are combined to guide the gas to the exhaust window, and the control valve cover is provided with a plug-in slot body corresponding to the two plug-in strips. The plug-in strip is engaged with the plug-in slot, so that the oil-gas separator and the control valve cover can be quickly assembled; the gas is discharged to the vicinity of the liquid storage cavity under the guidance of the guide strip and the outer arc-shaped guide wall, which ensures the smoothness of the exhaust and improves the exhaust efficiency.

[0009] As a further improvement of the technical solution of the present invention, a baffle assembly is provided between the ends of both sides of the outer arc baffle wall and the outer periphery of the inner arc baffle wall, and the baffle assembly includes two baffle strips distributed at intervals, the plane height of the upper surface of the baffle strip is lower than the plane height of the lower surface of the exhaust window, and the control valve cover is provided with a limit strip corresponding to the baffle strip. The baffle assembly can prevent the overflowed oil from directly impacting the bottom of the exhaust window and splashing out from the exhaust window, and the limit strip can prevent the oil-gas separator from axially deflecting due to bumps or impacts, resulting in poor exhaust.

[0010] As a further improvement of the technical solution of the present invention, exhaust notches are provided at both ends of the inner arc-shaped baffle wall, and the plane height of the lower surface of the exhaust notch is not lower than the plane height of the lower surface of the exhaust window, so as to further improve the exhaust efficiency while ensuring the separation effect of the oil-gas separator.

[0011] As a further improvement of the technical solution of the present invention, the inner arc baffle wall is arranged to face away from the exhaust window, and a plurality of reflux ports are provided at the bottom. The inner arc baffle wall arranged to face away from the exhaust window can prevent the gas from being discharged directly from the exhaust window, thereby ensuring the impact effect of the oil-gas mixture, and the reflux ports can also make the oil return in the liquid storage cavity smoother.

[0012] As a further improvement of the technical solution of the present invention, the oil-gas separator also includes two support plates symmetrically distributed on both sides of the arched support top, the support plate is provided with a bending plate higher than its upper surface, and the inner arc baffle wall, the outer arc baffle wall and the two outer arc guide walls are perpendicular to the support plate. The vertical structure of the support plate and the wall can improve the structural strength and stability of the oil-gas separator. Since the upper surface of the bending plate is in close contact with the inner wall of the welding flange, the bending plate is elastically deformed under pressure, and the bottom of the inner arc baffle wall, the outer arc baffle wall and the outer arc guide wall are in close contact with the upper surface of the control valve cover under the action of the elastic force of the bending plate, ensuring the sealing of the liquid storage chamber to the liquid.

[0013] As a further improvement of the technical solution of the present invention, the exhaust channel includes an exhaust portion 1 having an inner diameter equal to the inner diameter of the exhaust pipe, and an exhaust portion 2 having an inner diameter smaller than the inner diameter of the exhaust pipe. The stepped exhaust channel can ensure the smoothness of gas from the second exhaust chamber to the first exhaust chamber and from the first exhaust chamber to the exhaust pipe, and can prevent gas from flowing back from the first exhaust chamber to the second exhaust chamber.

[0014] As a further improvement of the technical solution of the present invention, the refueling control valve also includes a control valve body with a control sleeve arranged outside the control valve cover, a control spring is arranged in the control valve body, a control float is arranged at the upper end of the control spring, a seal is arranged on the top of the control float through a support frame, an exhaust hole is opened at the center of the control valve cover, the inner arc-shaped baffle wall is distributed around the outer periphery of the exhaust hole, an annular groove is opened on the outer periphery of the control valve cover corresponding to the welding flange, and a sealing ring is arranged in the annular groove. The sealing ring can improve the sealing performance of the combination valve when it is installed.

[0015] As a further improvement of the technical solution of the present invention, the welding flange further comprises a valve mounting portion and two mounting ears symmetrically distributed with each other, the bottom periphery of the valve mounting portion is provided with a welding structure, a slot is provided on the mounting ear, and a buckle is provided on the control valve body corresponding to the slot. The buckle is engaged with the slot to realize rapid assembly and replacement of the refueling control valve, further reducing production and maintenance costs.

[0016] As a further improvement of the technical solution of the present invention, the rollover valve includes an upper cover, a rollover valve body, a rollover float and a bottom bracket, the upper cover is provided with an exhaust port, the rollover valve body is provided with an exhaust boss corresponding to the exhaust port, a disc that can move up and down is provided between the exhaust boss and the upper cover, the disc is provided with a number of ventilation holes, the rollover float is supported on the bottom bracket through a rollover spring, the bottom of the exhaust boss is an inclined structure, the top of the rollover float is processed into an inclined structure corresponding to the bottom of the exhaust boss and is provided with a sealing gasket parallel to the inclined surface, and a sealing cover is provided at the highest end of the sealing gasket. The disc can achieve air pressure balance inside and outside the oil tank, and the inclined sealing gasket can improve the sealing effect when the rollover valve is closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of a preferred embodiment of the present invention.

[0018] Figure 2 It is a cross-sectional schematic diagram of a preferred embodiment of the present invention.

[0019] Figure 3 It is a three-dimensional structural schematic diagram of the oil-gas separator and the control valve cover during assembly in the present invention.

[0020] Figure 4 It is a top view of the oil-gas separator and the control valve cover when assembled in the present invention.

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the control valve cover in the present invention.

[0022] Figure 6 It is a schematic diagram of the three-dimensional structure of the oil-gas separator in the present invention.

[0023] Among them, 1 refueling control valve, 101 control valve cover, 101a plug-in slot body, 101b limit strip, 101c fixed round table, 101d installation round table, 101e annular groove, 101f exhaust hole, 102 control valve body, 103 control spring, 104 control float, 105 seal, 106 buckle, 107 sealing ring, 2 tip-up valve, 201 upper cover, 202 tip-up valve body, 203 tip-up float, 204 bottom support, 205 exhaust port, 206 exhaust boss, 207 disc, 208 ventilation hole, 209 sealing pad, 210 sealing cover, 211 Rollover spring, 3 welding flange, 301 first exhaust chamber, 302 second exhaust chamber, 303 exhaust channel, 303a exhaust part one, 303b exhaust part two, 304 exhaust pipe, 305 valve mounting part, 306 mounting ear, 307 slot, 4 oil-gas separator, 401 arched support top, 402 inner arc baffle wall, 403 outer arc baffle wall, 404 outer arc guide wall, 405 exhaust window, 406 guide strip, 407 plug-in strip, 408 baffle strip, 409 support plate, 410 bending plate, 411 return port, 412 exhaust notch, 5 welding structure. DETAILED DESCRIPTION

[0024] like Figure 1-2 As shown, a combined valve with oil-gas separation function includes a refueling control valve 1, a rollover valve 2 and a welding flange 3. The welding flange 3 includes a first exhaust chamber 301, a second exhaust chamber 302, an exhaust passage 303, an exhaust pipe 304, a valve mounting portion 305 and two symmetrically distributed mounting ears 306; the first exhaust chamber 301 is used to accommodate an oil-gas separator 4 and a control valve cover 101 of the refueling control valve 1, the second exhaust chamber 302 is used to install the rollover valve 2, and the exhaust passage 303 is used to connect the first exhaust chamber 301 and the second exhaust chamber 302; the oil-gas separator 4 includes an arched support top 40 1. An inner arc baffle wall 402, an outer arc baffle wall 403, and two symmetrically distributed outer arc guide walls 404. A liquid storage cavity is formed between the inner arc baffle wall 402, the outer arc guide walls 403 and the control valve cover 101. The two outer arc guide walls 404 are used to guide the liquid to the liquid storage cavity. An exhaust window 405 for connecting the liquid storage cavity and the exhaust pipe 304 is provided on the outer arc baffle wall 403. The arched support top 401 is used to guide the gas discharge direction. A welding structure 5 for connecting to the oil tank is provided on the bottom periphery of the valve mounting portion 305, and a card slot 307 is provided on the mounting ear 306.

[0025] In order to maximize the utilization rate of the oil-gas separator 4 in a limited space, the exhaust channel 303 and the exhaust pipe 304 are relatively distributed on both sides of the oil-gas separator 4. Specifically, the exhaust channel 303 includes an exhaust portion 1 303a having an inner diameter the same as that of the exhaust pipe 304, and an exhaust portion 2 303b having an inner diameter smaller than that of the exhaust pipe 304, which can ensure the smoothness of the gas discharge from the rollover valve 2 and prevent the gas that should be discharged from the exhaust window 405 from flowing back into the second exhaust chamber 302.

[0026] The refueling control valve 1 also includes a control valve body 102 whose control sleeve is arranged on the outside of the control valve cover 101, a buckle 106 is arranged on the outer periphery of the control valve body 102 corresponding to the card groove 307, a control spring 103 is arranged in the control valve body 102, a control float 104 is arranged on the upper end of the control spring 103, a seal 105 is arranged on the top of the control float 104 through a support frame, an exhaust hole 101f is opened at the center of the control valve cover 101, and an inner arc-shaped baffle wall 402 is distributed around the outer periphery of the exhaust hole 101f.

[0027] The tip-over valve 2 comprises an upper cover 201, a tip-over valve body 202, a tip-over float 203 and a bottom bracket 204. The upper cover 201 is provided with an exhaust port 205. The tip-over valve body 202 is provided with an exhaust boss 206 corresponding to the exhaust port. A disc 207 that can move up and down is provided between the exhaust boss 206 and the upper cover 201. A plurality of ventilation holes 208 are provided on the disc 207. The tip-over float 203 is supported on the bottom bracket 204 by a tip-over spring 211. The bottom of the exhaust boss 206 is an inclined structure. The top of the tip-over float 203 is processed into an inclined surface structure corresponding to the bottom of the exhaust boss 206 and is provided with a sealing gasket 209 parallel to the inclined surface. A sealing cover 210 is sleeved on the highest end of the sealing gasket 209.

[0028] A guide strip 406 is provided on the side of the outer arc-shaped guide wall 404 facing the exhaust passage 303, and a plug-in strip 407 is provided on the lower side of the guide strip 406. The guide strip 406 and the outer arc-shaped guide wall 404 are combined to guide the gas to the exhaust window 405. The control valve cover 101 is provided with a plug-in slot 101a corresponding to the two plug-in strips 407. Figure 3 and 5 As shown; baffle components are provided between the ends of both sides of the outer arc baffle wall 403 and the outer periphery of the inner arc baffle wall 402, and the baffle components include two baffle strips 408 distributed at intervals, and the plane height of the upper surface of the baffle strip 408 is lower than the plane height of the lower surface of the exhaust window 405, and the control valve cover 101 is provided with a limit strip 101b corresponding to the outer side of the baffle strip 408, as shown Figure 4 and 5 shown.

[0029] Below through Figure 6The structure of the oil-gas separator 4 is described in detail. In order to improve the strength of the structure of the oil-gas separator 4 and ensure stability during operation, the oil-gas separator 4 also includes two semicircular support plates 409 symmetrically distributed on both sides of the arched support top 401. A bending plate 410 higher than its upper surface is provided on the support plate 409. The inner arc baffle wall 402, the outer arc baffle wall 403 and the two outer arc guide walls 404 are all perpendicular to the support plate 409. After the refueling control valve 1 is assembled on the welding flange 3, the upper surface of the bending plate 410 is in close contact with the inner wall of the first exhaust chamber 301, resulting in the bending plate 410 being subjected to The inner arc baffle wall 402, the outer arc baffle wall 403 and the outer arc guide wall 404 are elastically deformed under pressure, and the bottoms of the inner arc baffle wall 402, the outer arc baffle wall 403 and the outer arc guide wall 404 are tightly attached to the upper surface of the control valve cover 101 under the action of the elastic force of the bending plate 410, thereby ensuring the sealing of the liquid storage chamber to the liquid; the inner arc baffle wall 402 is arranged to face away from the exhaust window 405, which can prevent the oil-gas mixture from being directly discharged from the exhaust window 405, and two reflux ports 411 are provided at the bottom of the inner arc baffle wall 402 to ensure the smoothness of the oil reflux, and exhaust notches 412 are provided at the ends of both sides of the inner arc baffle wall 402 to ensure the smooth flow of gas Furthermore, the control valve cover 101 includes a fixed truncated platform 101c and a mounting truncated platform 101d, the oil-gas separator 4 is eccentrically arranged on the fixed truncated platform 101c, and the outer periphery of the outer arc-shaped baffle wall 403 is in close contact with the inner wall of the fixed truncated platform 101c, which increases the exhaust path, helps the oil and gas in the fuel tank to be effectively discharged to the outside, avoids excessive accumulation of oil and gas in the fuel tank, thereby reducing the evaporation loss of fuel and improving fuel economy; the plug-in slot 101a and the limit strip 101b are both integrally arranged on the inner wall of the fixed truncated platform 101c; the plane height of the lower surface of the exhaust notch 412 and the lower surface of the exhaust window 405 are The plane height of the surface is consistent with the height of the fixed truncated cone 101c, so the height of the fixed truncated cone 101c is the height of the liquid storage chamber, which makes maximum use of the limited space in the welding flange 3; an annular groove 101e is provided on the outer periphery of the fixed truncated cone 101c corresponding to the welding flange 3, and a sealing ring 107 is provided in the annular groove 101e, which can improve the sealing performance of the refueling control valve 1 assembled on the welding flange 3; the control valve body 102 is engaged with the groove 307 through the buckle 106, and is thus sleeved on the outer periphery of the mounting truncated cone 101d, so as to realize the rapid assembly and replacement of the refueling control valve 1 and reduce the production and maintenance costs.

[0030] When the present invention is used, the combined valve is installed on the fuel tank by welding the flange 3; when the car travels on a bumpy road section, the oil gas and oil liquid in the fuel tank overflow from the exhaust hole 101f or the exhaust channel 303; the oil liquid overflowing from the exhaust channel 303 flows back to the fuel tank from the exhaust hole 101f or is temporarily stored in the liquid storage chamber along the direction guided by the guide strip 406 and the outer arc-shaped guide wall 404 and is blocked by the outer arc-shaped baffle wall 403 of the inner arc-shaped baffle wall 402, and the oil liquid overflowing from the exhaust hole 101f is returned to the fuel tank or temporarily stored in the liquid storage chamber. Under the action of the inner arc baffle wall 402 and the outer arc baffle wall 403, the oil flows back from the exhaust hole 101f to the oil tank or is temporarily stored in the liquid storage chamber; the oil-gas mixture overflowing from the exhaust hole 101f and the exhaust channel 303 continuously hits the arch support top 401, the inner arc baffle wall 402, the outer arc baffle wall 403, the outer arc guide wall 404 and the support plate 409, realizing oil-gas separation, and the separated gas is discharged from the exhaust window 405 to the exhaust pipe 304 along the planned path, such as Figure 4 In the direction of the middle arrow, A direction: exhaust hole 101f → exhaust notch 412 → the area between the inner arc-shaped baffle wall 402 and the outer arc-shaped baffle wall 403 (i.e., the area above the liquid storage chamber) and / or the area between the fixed truncated table 101c and the outer arc-shaped baffle wall 403 → exhaust window 405 → exhaust pipe 304, B direction: exhaust channel 303 → the area between the outer arc-shaped guide wall 404 and the inner arc-shaped baffle wall 402 → the inner arc-shaped baffle wall 402 The area between the fixed truncated platform 101c and the outer arc-shaped baffle wall 403 (i.e., the area above the liquid storage chamber) and / or the area between the fixed truncated platform 101c and the outer arc-shaped baffle wall 403 → exhaust window 405 → exhaust pipe 304. The separated oil is divided under the action of the arched support top 401 and flows into the liquid storage chamber along the wall. After the vehicle runs smoothly, the oil in the liquid storage chamber passes through the exhaust hole 101f and / or the reflux port 411, and returns to the oil tank through the refueling control valve 1. Figure 2 When the car rolls over, the control float 104 and the rollover float 203 drive the sealing structure to form a sealing surface with the corresponding valve cover under the action of their own gravity, thereby preventing a large amount of fuel in the fuel tank from overflowing from the valve port, while a small portion of the fuel falls due to gravity and is collected in the arched support top 401, preventing further leakage of the fuel.

[0031] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A combination valve with oil-gas separation function, comprising a refueling control valve, a rollover valve and a welding flange, characterized in that: The welding flange includes a first exhaust chamber, a second exhaust chamber, an exhaust channel and an exhaust pipe. The first exhaust chamber is used to accommodate an oil-gas separator and a control valve cover of a refueling control valve. The second exhaust chamber is used to install a rollover valve. The exhaust channel is used to connect the first exhaust chamber and the second exhaust chamber. The oil-gas separator includes an arched support top, an inner arc-shaped baffle wall, an outer arc-shaped baffle wall, and two outer arc-shaped guide walls symmetrically distributed with each other. A liquid storage chamber is formed between the inner arc-shaped baffle wall, the outer arc-shaped baffle wall and the control valve cover. The two outer arc-shaped guide walls are used to guide liquid to the liquid storage chamber. An exhaust window for connecting the liquid storage chamber and the exhaust pipe is provided on the outer arc-shaped baffle wall. The arched support top is used to guide the gas discharge direction.

2. A combination valve with oil-gas separation function according to claim 1, characterized in that: A guide strip is arranged on the side of the outer arc guide wall facing the exhaust passage, and a plug-in strip is arranged on the lower side of the guide strip. The guide strip and the outer arc guide wall are combined to guide the gas to the exhaust window, and the control valve cover is provided with plug-in grooves corresponding to the two plug-in strips.

3. The combination valve with oil-gas separation function according to claim 1, characterized in that: A baffle assembly is arranged between the ends of both sides of the outer arc-shaped baffle wall and the outer periphery of the inner arc-shaped baffle wall. The baffle assembly includes two baffle strips distributed at intervals. The plane height of the upper surface of the baffle strip is lower than the plane height of the lower surface of the exhaust window. The control valve cover is provided with a limit strip corresponding to the baffle strip.

4. The combination valve with oil-gas separation function according to claim 1, characterized in that: Exhaust notches are provided at both ends of the inner arc-shaped baffle wall, and the plane height at which the lower surface of the exhaust notch is located is not lower than the plane height at which the lower surface of the exhaust window is located.

5. The combined valve with oil-gas separation function according to claim 1, characterized in that: The inner arc-shaped baffle wall is arranged facing away from the exhaust window, and a plurality of return flow ports are opened at the bottom.

6. The combination valve with oil-gas separation function according to claim 1, characterized in that: The oil-gas separator also includes two support plates symmetrically distributed on both sides of the arched support top, and a bending plate higher than its upper surface is arranged on the support plate. The inner arc baffle wall, the outer arc baffle wall and the two outer arc guide walls are all perpendicular to the support plate.

7. The combined valve with oil-gas separation function according to claim 1, characterized in that: The exhaust passage comprises an exhaust portion 1 having an inner diameter the same as that of the exhaust pipe, and an exhaust portion 2 having an inner diameter smaller than that of the exhaust pipe.

8. The combined valve with oil-gas separation function according to claim 1, characterized in that: The refueling control valve also includes a control valve body with a control sleeve arranged on the outside of the control valve cover, a control spring is arranged in the control valve body, a control float is arranged on the upper end of the control spring, a sealing member is arranged on the top of the control float through a support frame, an exhaust hole is opened at the center of the control valve cover, the inner arc-shaped baffle wall is distributed around the periphery of the exhaust hole, an annular groove is opened on the outer periphery of the control valve cover corresponding to the welding flange, and a sealing ring is arranged in the annular groove.

9. The combined valve with oil-gas separation function according to claim 1, characterized in that: The welding flange also includes a valve mounting portion and two mounting ears symmetrically distributed with each other. The bottom periphery of the valve mounting portion is provided with a welding structure. A slot is provided on the mounting ear, and a buckle is provided on the control valve body corresponding to the slot.

10. The combined valve with oil-gas separation function according to claim 1, characterized in that: The rollover valve includes an upper cover, a rollover valve body, a rollover float and a bottom support. The upper cover is provided with an exhaust port, and the rollover valve body is provided with an exhaust boss corresponding to the exhaust port. A disc that can move up and down is provided between the exhaust boss and the upper cover, and a plurality of ventilation holes are provided on the disc. The rollover float is supported on the bottom support by a rollover spring, and the bottom of the exhaust boss is an inclined structure. The top end of the rollover float is processed into an inclined surface structure corresponding to the bottom of the exhaust boss and is provided with a sealing gasket parallel to the inclined surface, and a sealing cover is provided at the highest end of the sealing gasket.

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