CN117072732B - Slope exhaust valve and working method thereof - Google Patents

Slope exhaust valve and working method thereof Download PDF

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Publication number
CN117072732B
CN117072732B CN202311345893.9A CN202311345893A CN117072732B CN 117072732 B CN117072732 B CN 117072732B CN 202311345893 A CN202311345893 A CN 202311345893A CN 117072732 B CN117072732 B CN 117072732B
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China
Prior art keywords
float
valve
shell
vent
exhaust valve
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CN117072732A (en
Inventor
付传芳
刘牮
孙红明
周彪
胡安东
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Stantic Automobile Systems Suzhou Co ltd
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Stantic Automobile Systems Suzhou Co ltd
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K24/00—Devices, e.g. valves, for venting or aerating enclosures
    • F16K24/04—Devices, e.g. valves, for venting or aerating enclosures for venting only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/035—Fuel tanks characterised by venting means
    • B60K15/03519—Valve arrangements in the vent line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/12—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side weight-loaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/36—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K24/00—Devices, e.g. valves, for venting or aerating enclosures
    • F16K24/04—Devices, e.g. valves, for venting or aerating enclosures for venting only
    • F16K24/042—Devices, e.g. valves, for venting or aerating enclosures for venting only actuated by a float
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/18—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float
    • F16K31/20—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float actuating a lift valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03256—Fuel tanks characterised by special valves, the mounting thereof
    • B60K2015/03289—Float valves; Floats therefor

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)

Abstract

A slope exhaust valve and a working method thereof comprise the following steps: a valve housing; a float housing disposed inside the valve housing; the float shell comprises a float shell body, a head valve accommodating seat, a connecting baffle plate and a float inner retaining wall, wherein the head valve accommodating seat, the connecting baffle plate and the float shell body are sequentially connected from top to bottom and coaxially arranged, and the float inner retaining wall is arranged in the float shell body, and the upper end of the float inner retaining wall is connected with the bottom of the connecting baffle plate; the center of the connecting partition plate is provided with a vent hole structure, and the outer edge of the connecting partition plate is connected with the valve shell; the floater is arranged inside the floater shell body in a sliding manner and positioned inside the retaining wall in the floater; a head valve; a sealing sheet; and (3) a spring. The gradient exhaust valve and the working method thereof are applied to an oil tank system in a vehicle, can meet the smoothness of exhaust under various working conditions of the vehicle, ensure the sealing performance under special conditions, and better protect the oil tank system and the running safety of the vehicle.

Description

Slope exhaust valve and working method thereof
Technical Field
The invention belongs to the technical field of automobile fuel management systems, and particularly relates to a gradient exhaust valve and a working method thereof.
Background
A gradient exhaust valve (Grade Rollover Valve, GRV for short) for exhausting the fuel tank system in the vehicle in a refueling and driving state. The slope exhaust valve needs to meet the smoothness of exhaust under various working conditions and ensure the sealing performance under special conditions.
Firstly, in the refueling process, a main exhaust channel of a Fuel tank system in a vehicle is a Fuel Limit Valve (FLV for short), and a slope exhaust Valve is used as an auxiliary exhaust channel, wherein the slope exhaust Valve needs to keep a low ventilation state in the refueling process, otherwise, a large ventilation amount can cause that a Fuel gun cannot jump, and excessive refueling is performed.
And secondly, as the fuel vapor in the fuel tank is increased, the gradient exhaust valve needs to be kept in a high-flow ventilation state, so that the pressure stability in the fuel tank is ensured, and the pressure increase of the fuel tank is prevented.
Furthermore, in the driving process of the vehicle, when oil in the oil tank shakes greatly or the oil tank is in a limit gradient state, the oil enters the interior of the gradient exhaust valve shell, the liquid level in the valve can rise, and at the moment, the oil can easily enter a pipeline through the normally-open gradient exhaust valve exhaust channel, so that the pipeline is blocked, the load of a carbon tank is increased, and even the carbon tank is invalid.
Therefore, an object of the present invention is to provide a structural design of a gradient exhaust valve and a corresponding working method, so as to solve the above technical problems.
Disclosure of Invention
The invention aims to: in order to overcome the defects, the invention aims to provide the gradient exhaust valve and the working method thereof, which are reasonable in structural design, are applied to an oil tank system in a vehicle, meet the requirements of smoothness of exhaust under various working conditions of the vehicle and ensure sealing performance under special conditions, not only can keep normal ventilation of low flow of the oil tank, but also can provide exhaust with larger flow for the oil tank under the condition that an oil filling limiting valve is closed, can be closed in time to ensure better dynamic sealing performance of liquid, and good re-opening capability after closing, and better protect the oil tank system and vehicle running safety, and have wide application prospects.
The invention aims at realizing the following technical scheme:
a grade exhaust valve, comprising:
a valve housing;
a float housing disposed inside the valve housing; the float shell comprises a float shell body, a head valve accommodating seat, a connecting baffle plate and a float inner retaining wall, wherein the head valve accommodating seat, the connecting baffle plate and the float shell body are sequentially connected from top to bottom and coaxially arranged, and the float inner retaining wall is arranged in the float shell body, and the upper end of the float inner retaining wall is connected with the bottom of the connecting baffle plate; the center of the connecting partition plate is provided with a vent hole structure, and the outer edge of the connecting partition plate is connected with the valve shell;
the floater is arranged inside the floater shell body in a sliding manner and positioned inside the retaining wall in the floater;
a head valve disposed within the head valve receptacle;
a sealing plate disposed on top of the float and coaxial with the vent structure;
the upper part of the spring is sleeved on the lower part of the floater, a spring seat is arranged in the center of the inner bottom of the valve shell, and the lower part of the spring is in butt joint with the inner bottom surface of the spring seat.
The gradient exhaust valve disclosed by the invention is reasonable in structural design, can keep low-flow normal ventilation of the oil tank, can provide large-flow exhaust for the oil tank under the condition that the oil filling limiting valve is closed, can be closed in time to provide better liquid dynamic sealing performance, and has good re-opening capability, so that the oil tank system and the running safety of a vehicle are better protected.
When the vehicle is in the refueling process, the refueling limit valve is opened, the refueling limit valve is used as a main exhaust channel, the slope exhaust valve is used as an auxiliary exhaust channel, the slope exhaust valve is kept in a low-ventilation state, and the problems that the gun cannot jump and excessive refueling of the refueling gun due to excessive ventilation are avoided during auxiliary exhaust; when the vehicle is in a full oil level state, the oil filling limiting valve is kept closed, and the gradient exhaust valve is used as an exhaust channel at the moment. The ventilation state of the gradient exhaust valve is adjusted mainly through the cooperation between the head valve and the ventilation hole structure and the sealing piece.
In addition, when the vehicle is in the in-process of traveling, the fluid in the oil tank rocks greatly or the oil tank is in limit slope state, and fluid gets into in the slope discharge valve and makes the liquid level in the slope discharge valve rise, and slope discharge valve needs in time to close and ensure the leakproofness this moment, otherwise fluid very easily enters into the pipeline through the air vent structure of the slope discharge valve that always opens, causes the pipeline to block, and carbon tank load increases, causes even carbon tank inefficacy.
In order to solve the problem, the invention adopts a three-wall structure design of the valve shell, the float shell and the retaining wall in the float, oil entering the valve shell basically cannot enter the vent hole structure along with fuel steam, meanwhile, the float is lifted up in the valve shell due to the rising of the oil liquid level and the action of air flow, the vent hole structure is blocked by the lifting of the float, and the slope exhaust valve is closed and sealed. Even if very little Xu Youye enters the interior of the float shell along with fuel vapor, the interior of the float shell and the air vent structure are also provided with the inner retaining wall of the float, and oil can flow to the air vent structure through the valve shell, the float shell and the three retaining walls of the inner retaining wall of the float, so that the quantity of the oil is very little, can be ignored, and the dynamic leakage of the liquid is near zero under the dynamic condition.
The gradient exhaust valve further comprises a valve cover, and the valve cover is independently designed by adopting a valve shell, and can be applied to a metal oil tank and a plastic oil tank only by matching with different valve covers, so that diversified requirements of customers are met.
Furthermore, the slope exhaust valve is characterized in that the float shell body is of a cylindrical structure, a float shell vent hole is formed in the side wall of the upper portion of the float shell body, a valve shell vent hole is also formed in the side wall of the upper portion of the valve shell, and the float shell vent hole and the valve shell vent hole form a 180-degree angle in the relative position.
After fuel steam and oil enter the valve shell from the valve shell vent, the float shell body can be touched at the first time, and the float shell vent of the float shell body forms a 180-degree angle with the valve shell vent at the opposite position, if the fuel steam and the oil want to enter the vent hole structure in the float shell, the fuel steam and the oil need to bypass 180 degrees from the outer wall of the float shell to the float shell vent from the valve shell vent, enter the float shell from the float shell vent, and then bypass at least 90 degrees along the retaining wall in the float to reach the vent hole structure.
Further, the vent hole structure of the slope exhaust valve comprises an outer convex ring, an inner convex ring, a side channel and a vent main channel; the center of the top surface of the connecting partition plate is provided with a concentric outer convex ring and an inner convex ring, the left side and the right side of the inner convex ring are symmetrically provided with notches, side channels are respectively arranged between the 2 notches and the inner wall of the outer convex ring, and the outer convex ring is provided with a thin flow hole at the position corresponding to one of the side channels; the part of the connecting partition plate in the inner convex ring is provided with a vent hole, the lower end of the vent hole is provided with a vent main channel, and the lower end of the vent main channel extends to the inside of the float shell body.
The design of the vent hole structure has the functions of supporting and sealing the head valve and enables the air flow to flow in a planned path. The vent structure is provided with the thin flow hole in the position department that the evagination ring corresponds one of them side channel, and this thin flow hole is located on the head valve sealing surface, and when head valve bottom and vent structure top butt, thin flow hole can ventilate, has satisfied low flow and has ventilated needs, can guarantee that the oil tank is in low pressure state, normal operating, and under the oil tank normal operating condition, thin flow hole can supply air for the oil tank, prevents that the negative pressure state from appearing in the oil tank.
Further, in the gradient exhaust valve, the outer diameter of the outer convex ring is smaller than the outer diameter of the head valve; the outer diameter of the inner convex ring is 6-7 mm, and the inner diameter of the inner convex ring is 5-6 mm; the heights of the outer convex ring and the inner convex ring are 0.5-1.5 mm; the cross-sectional area of the fine flow hole is (0.3-0.6) × (0.6-1.2) mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The diameter of the ventilation main channel is 3.3-3.6 mm, and the length of the ventilation main channel is 3-6 mm.
The design of the inner convex ring determines the area of the sealing surface of the head valve contacting the air hole, the area of the air determines the opening pressure of the head valve, the position of the sealing surface of the head valve is provided with a thin flow hole, and the cross section area of the thin flow hole is designed to be (0.3-0.6) mm x (0.6-1.2) mm 2 The low-flow ventilation requirement can be met, the ventilation capacity is limited by the head valve, namely, the ventilation capacity is less than 1.8mL/min at 1.25kPa, and smooth gun jump during refueling can be ensured. The diameter of the ventilation main channel is designed to be 33-3.6 mm, the length design is 3-6 mm, not only can meet the requirement of high-flow exhaust, but also can prevent the floater from interfering the vent structure, wherein the ventilation amount is not less than 60 mL/min. The outer diameter of the circular ring at the contact surface of the sealing sheet and the ventilation main channel is 3.4-3.8 mm, the inner diameter is 3.3-3.6 mm, the requirement of re-opening is met, and the re-opening pressure is not less than 17kPa.
Furthermore, in the slope exhaust valve, the inner retaining wall of the floater is of an annular structure, and a plurality of vertical sliding ribs are uniformly arranged on the inner wall of the side wall of the inner retaining wall of the floater to match the sliding of the floater; the side wall of the inner retaining wall of the floater is provided with 3 vertical openings, wherein one opening forms an angle of 180 degrees with the air vent of the shell of the floater at the relative position, and the other 2 openings form an angle of 90 degrees with the air vent of the shell of the floater at the relative position respectively; and vertical guide ribs are arranged at the bottoms of 1 or more sliding ribs.
Further, in the gradient exhaust valve, the outer diameter of the inner retaining wall of the floater is 25-30 mm, and the height of the inner retaining wall of the floater is 15-20 mm; the inner diameter of the sliding rib is 20-24 mm, and the height of the sliding rib is 15-20 mm; the cross-sectional area of the opening is (4-5) × (15-20) mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The height of the guide rib is 2-10 mm.
The structural design of the inner baffle wall of the floater can reduce the dynamic leakage of liquid under the dynamic condition to the greatest extent. Wherein, evenly arranged a plurality of vertical sliding bars in the retaining wall lateral wall inner wall in the float, can guarantee the better slip of float to ensure the timely closure, the timely opening of slope discharge valve.
Because the retaining wall plays a certain blocking role on ventilation in the floater, in order to ensure ventilation, 3 vertical openings are formed in the side wall of the retaining wall in the floater, one of the openings forms an angle of 180 degrees with the vent hole of the floater shell in the relative position, and the other 2 openings respectively form an angle of 90 degrees with the vent hole of the floater shell in the relative position, so that the ventilation is ensured, and the effect that fuel steam and oil liquid enter the floater shell from the vent hole of the floater shell and can reach the vent hole structure after bypassing the retaining wall by at least 90 degrees along the inner retaining wall of the floater is also satisfied. The vertical guide ribs are arranged at the bottoms of the sliding ribs, so that the guide ribs can play roles in aligning and correcting, and the floats are prevented from being assembled in place.
Furthermore, the size of the retaining wall and the size of the opening in the floater are set, so that the liquid can be ensured not to leak, and the gradient exhaust valve has excellent liquid dynamic sealing performance.
Further, the gradient exhaust valve further comprises:
and the O-shaped ring is arranged on the sealing surface of the outer side surface of the head valve accommodating seat.
Further, in the slope exhaust valve, the outer edge of the connecting partition plate is provided with a plurality of fastening holes, the top of the valve shell is provided with a plurality of self-locking fasteners matched with the fastening holes, and the valve shell and the float shell are assembled in a fastening mode and self-locked after assembly; the outer edge of the connecting partition plate is also provided with an inner shell window, and the inner shell window corresponds to the air vent of the float outer shell.
The valve shell and the float shell are assembled in a snap-in mode, and are self-locked after assembly, the self-locking clamping hook structure is fixedly connected in an assembling mode instead of a welding mode, so that the cost is effectively reduced, the connection is stable and reliable, the maintenance and replacement of internal parts of the gradient exhaust valve are facilitated, and the self-locking clamping hook structure can also reduce welding procedures and sundries such as welding slag caused by the welding procedures.
Preferably, the valve housing, the float and the sealing piece are all made of plastic injection molding.
The invention also relates to a working method of the gradient exhaust valve, which comprises the following steps:
s1: in the oiling state of the vehicle, the oiling limiting valve is opened, the head valve of the gradient exhaust valve is closed, the bottom of the head valve is abutted with the top of the vent hole structure connected with the partition plate, the vent hole structure is provided with a thin flow hole, and the gradient exhaust valve is only ventilated through the thin flow hole, so that a low ventilation state is maintained;
s2: under the running state of the vehicle, the oiling limiting valve is closed, and the state of the gradient exhaust valve is as follows:
s21: when the oil in the oil tank is in a stable state, a head valve of the gradient exhaust valve is closed, the bottom of the head valve is abutted with the top of the vent hole structure, and the gradient exhaust valve is ventilated only through the trickle hole and keeps a low ventilation state;
s22: when the oil in the oil tank shakes greatly or the oil tank is in a limit gradient state, the oil in the oil tank enters the valve shell due to shaking and pushes the floater to rise together with air flow, the floater rises, the sealing sheet immediately plugs the vent hole structure, the gradient exhaust valve is sealed, the air flow is stable after the oil in the oil tank is restored to be stable, the floater falls down, the vent hole structure is opened, the gradient exhaust valve is ventilated through the trickle hole and keeps a low ventilation state, and particularly, the excessive pressure of the oil tank is avoided after the limit gradient is passed;
s23: when the fuel vapor increases in a full oil level state or a high temperature state, along with the increase of the fuel vapor, when the internal pressure of the fuel tank reaches 3-5 kPa, a head valve of the gradient exhaust valve is jacked up, a gap is formed between the head valve and a vent hole structure, and the gradient exhaust valve is ventilated through the vent hole structure, so that a high-flow ventilation state is maintained.
Further, according to the working method of the gradient exhaust valve, an exhaust route of the gradient exhaust valve is as follows: the first step, fuel vapor enters the valve shell from the vent of the valve shell; secondly, after entering the valve shell, fuel steam firstly hits the outer wall of the float shell, and because the air port of the float shell and the air port of the valve shell form a 180-degree angle at the relative position, the fuel steam bypasses the outer wall of the float shell for 180 degrees to the air port of the float shell, and enters the interior of the float shell from the air port of the float shell; and thirdly, after the fuel vapor enters the interior of the float shell, the fuel vapor hits the retaining wall in the float and then bypasses at least 90 degrees along the retaining wall in the float to enter the vent hole structure and is discharged from the vent hole structure.
Compared with the prior art, the invention has the following beneficial effects:
(1) The gradient exhaust valve disclosed by the invention has reasonable structural design, can keep normal ventilation of low flow of the oil tank, can provide exhaust with larger flow for the oil tank under the condition that the oil filling limiting valve is closed, can be closed in time to provide better liquid dynamic sealing performance, has good re-opening capability and better protects the oil tank system and the running safety of vehicles;
(2) According to the gradient exhaust valve disclosed by the invention, the inner retaining wall of the floater is arranged between the inner part of the floater shell and the vent hole structure, fuel steam and oil firstly bypass 180 degrees from the outer wall of the floater shell from the vent hole of the valve shell to the vent hole of the floater shell, then enter the inner part of the floater shell from the vent hole of the floater shell, and reach the vent hole structure after bypassing at least 90 degrees along the inner retaining wall of the floater, so that the quantity of the fuel steam and the oil flowing to the vent hole structure through the three retaining walls of the valve shell, the floater shell and the inner retaining wall of the floater is extremely small, the dynamic leakage of liquid is close to zero under the dynamic condition, and the exhaust is smoother;
(3) According to the gradient exhaust valve disclosed by the invention, the gradient exhaust valve can be automatically adjusted according to different exhaust requirements, and the ventilation state adjustment of the gradient exhaust valve is mainly realized through the cooperation between the head valve and the ventilation hole structure and the sealing piece; the position of the sealing surface of the head valve is provided with a thin flow hole, the design of the thin flow hole can meet the requirement of low-flow ventilation, so that the head valve limits ventilation, namely the ventilation is less than 1.8mL/min at 1.25kPa, and smooth gun jump during refueling can be ensured; the design of the ventilation main channel and the ventilation hole structure not only can meet the requirement of high-flow exhaust, but also can prevent the floater from interfering the ventilation hole structure, wherein the ventilation amount is not less than 60 mL/min; the design of the contact area of the sealing piece and the ventilation main channel meets the requirement of re-opening, and the re-opening pressure is not less than 17kPa;
(4) According to the gradient exhaust valve disclosed by the invention, the valve shell and the float shell are assembled in a snap-in mode, and are self-locked after assembly, the self-locking clamping hook structure is assembled in a mode of replacing a welding mode to be fixedly connected, so that the cost is effectively reduced, the connection is stable and reliable, the maintenance and the replacement of internal parts of the gradient exhaust valve are facilitated, and the self-locking clamping hook structure can also reduce welding procedures and sundries such as welding slag caused by the welding procedures;
(5) The working method of the gradient exhaust valve disclosed by the invention is simple and has high flexibility, and is applied to an oil tank system in a vehicle, so that the smoothness of exhaust under various working conditions of the vehicle is met, and the sealing performance under special conditions is ensured.
Drawings
FIG. 1 is an exploded view of a slope exhaust valve according to the present invention;
FIG. 2 is a cross-sectional view of the poppet valve of the present invention;
FIG. 3 is a schematic view of the structure of the float housing of the gradient exhaust valve of the present invention;
FIG. 4 is a cross-sectional view of the float housing of the gradient exhaust valve of the present invention;
FIG. 5 is a second cross-sectional view of the float housing of the gradient exhaust valve of the present invention;
FIG. 6 is a bottom view of the float housing of the gradient vent valve of the present invention;
FIG. 7 is a bottom view of a second float housing of the gradient exhaust valve of the present invention;
FIG. 8 is a schematic view of the structure of the float of the gradient exhaust valve according to the present invention;
FIG. 9 is a schematic illustration of snap-in assembly of a sloped exhaust valve according to the present invention;
FIG. 10 is a cross-sectional view of the low-ventilation state of the gradient exhaust valve according to the present invention;
FIG. 11 is a cross-sectional view of a sealed condition of the poppet valve of the present invention;
FIG. 12 is a cross-sectional view of a high flow ventilation condition of the gradient exhaust valve of the present invention;
FIG. 13 is a schematic view of the exhaust path of the gradient exhaust valve according to the present invention;
FIG. 14 is a schematic diagram of the flow of oil through the gradient exhaust valve according to the present invention;
FIG. 15 is an exploded view of comparative example 1 according to the present invention;
FIG. 16 is a schematic diagram showing the structure of comparative example 2 according to the present invention;
FIG. 17 is a second schematic structural view of comparative example 2 according to the present invention;
in the figure: valve housing 1, spring seat 11, valve housing vent 12, self-locking buckle 13, float housing 2, float housing body 21, float housing vent 211, head valve housing seat 22, sealing surface 221, connecting partition 23, vent hole 231, buckle hole 232, inner housing window 233, float inner retaining wall 24, sliding rib 241, opening 242, guide rib 243, vent hole structure 25, outer convex ring 251, trickle hole 2511, inner convex ring 252, notch 2521, side channel 253, vent main channel 254, float 3, head valve 4, sealing piece 5, spring 6, O-ring 7, height a of float inner retaining wall, height b of sliding rib, height c of guide rib, inner diameter d of inner convex ring, diameter e of vent main channel, length f of vent main channel, outer diameter g of float inner retaining wall, inner diameter h of sliding rib.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to example 1, comparative example 2, specific experimental data, and fig. 1 to 17, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The following examples 1,2 provide a gradient exhaust valve.
Example 1
The slope exhaust valve of embodiment 1, as shown in fig. 1, includes a valve housing 1, a float housing 2, a float 3, a head valve 4, a sealing plate 5, a spring 6, and an O-ring 7. The gradient exhaust valve also comprises a valve cover (not shown), and the invention adopts the independent design of the valve shell 1, and can be applied to a metal oil tank and a plastic oil tank only by matching with different valve covers, thereby meeting the diversified demands of customers.
As shown in fig. 2 to 7, the float housing 2 includes a float housing body 21, a head valve housing seat 22, a connection spacer 23, and a float inner retaining wall 24. The head valve housing seat 22, the connection partition plate 23, and the float housing body 21 are connected in order from top to bottom and coaxially arranged.
As shown in fig. 13, the float housing body 21 has a cylindrical structure, a float housing vent 211 is provided on the upper side wall of the float housing body 21, a valve housing vent 12 is also provided on the upper side wall of the valve housing 1, and the float housing vent 211 and the valve housing vent 12 are positioned at an angle of 180 degrees.
Wherein, float shell body 21 sets up inside valve shell 1, and the connection baffle 23 outward flange is connected with valve shell 1, and the interior retaining wall 24 of float sets up inside float shell body 21 and the upper end is connected with connection baffle 23 bottom, and float 3 slides and sets up inside float shell body 21 and is located float interior retaining wall 24 inboard, and head valve 4 sets up in head valve accommodation seat 22, and O type circle 7 sets up the sealed face 221 at head valve accommodation seat 22 lateral surface. The upper part of the spring 6 is sleeved at the lower part of the floater 3, a spring seat 11 is arranged at the center position in the inner bottom of the valve shell 1, and the lower part of the spring 6 is in contact with the inner bottom surface of the spring seat 11.
Further, as shown in fig. 3 and 4, a vent structure 25 is formed at the center of the connection spacer 23, and the vent structure 25 includes an outer collar 251, an inner collar 252, a side passage 253, and a vent main passage 254. Concentric outer convex rings 251 and inner convex rings 252 are arranged in the center of the top surface of the connecting partition plate 23, notches 2521,2 are symmetrically arranged on the left side and the right side of the inner convex rings 252, side channels 253 are arranged between the notches 2521 and the inner wall of the outer convex rings 251, and fine flow holes 2511 are formed in the outer convex rings 251 at positions corresponding to one of the side channels 253. The connecting partition 23 is provided with a vent hole 231 at a portion in the inner collar 252, a vent main passage 254 is provided at a lower end of the vent hole 231, and a lower end of the vent main passage 254 extends into the float housing body 21.
The design of the vent structure 25 provides support and sealing for the head valve 4 and allows airflow to flow in a planned path. In particular, the trickle hole 2511 is located on the sealing surface of the head valve 4, when the bottom of the head valve 4 is abutted to the top of the vent hole structure 25 and the vent hole structure 25 is opened, the trickle hole 2511 can vent, so that the low-flow venting requirement is met, the fuel tank can be ensured to be in a low-pressure state and to operate normally, and under the normal operating condition of the fuel tank, the trickle hole 2511 can supplement air to the fuel tank to prevent the fuel tank from being in a negative pressure state.
Further, as shown in fig. 4 and 5, the outer diameter of the outer collar 251 is smaller than the outer diameter of the head valve 4. The inner convex ring 252 has an outer diameter of 6.5mm and an inner diameter of 5.8mm, the design of the inner convex ring 252 determines the area of the gas, and the area of the gas determines the pressure, the outer convex ring 251, the inner convex ringThe height of the collars 252 is 0.9mm. The cross-sectional area of the fine flow hole 2511 is 0.5X0.9 mm 2 The low-flow ventilation requirement can be met, the ventilation capacity is limited by the head valve, namely, the ventilation capacity is less than 1.8mL/min at 1.25kPa, and smooth gun jump during refueling can be ensured. The diameter of the ventilation main channel 254 is 3.5mm, the length is 4.5mm, the requirement of high-flow exhaust can be met, the ventilation amount is not less than 60mL/min, and the float can be prevented from interfering the ventilation hole structure. The outer diameter of the circular ring at the contact surface of the sealing sheet and the ventilation main channel is 3.70mm, the inner diameter is 3.55mm, the requirement of restarting is met, and the restarting pressure is not less than 17kPa.
Further, as shown in fig. 4, 5, 6 and 7, the inner wall 24 of the float is of a ring structure, the outer diameter of the inner wall 24 of the float is 26mm, the height of the inner wall 24 of the float is 16.3mm, since the inner wall 24 of the float has a certain blocking effect on ventilation, in order to ensure ventilation, 3 vertical openings 242 are formed in the side wall of the inner wall 24 of the float, and the sectional area of the openings 242 is 4.8x16.3mm 2 One of the openings 242 is at an angle of 180 ° relative to the float housing vent 211, and the other 2 openings 242 are each at an angle of 90 ° relative to the float housing vent 211. Thus, the ventilation quantity is ensured, the effect that fuel vapor and oil enter the interior of the float shell 2 from the air vent 211 of the float shell and can reach the vent hole structure 25 only after the fuel vapor and the oil have to detour by at least 90 degrees along the retaining wall 24 in the float is met, and the dynamic leakage of liquid under the dynamic condition can be reduced to the greatest extent.
Further, a plurality of vertical sliding ribs 241 are uniformly arranged on the inner wall of the side wall of the retaining wall 24 in the floater to match the sliding of the floater 3, the inner diameter formed by the sliding ribs 241 is 22.2mm, the height of the sliding ribs 241 is 16.3mm, and the floater 3 can slide better, so that the slope exhaust valve is closed and opened in time. The bottom of 1 or more sliding ribs 241 is provided with vertical guide ribs 243, the height of the guide ribs 243 is 2.3 mm, the guide ribs can play a role in alignment and correction, and the floats 3 are prevented from being assembled in place.
Further, as shown in fig. 9, the outer edge of the connecting partition 23 is provided with a plurality of fastening holes 232, the top of the valve housing 1 is provided with a plurality of self-locking fasteners 13 matching the fastening holes 232, and the valve housing 1 and the float housing 2 are assembled in a fastening manner and self-locked after assembly. The self-locking clamping hook structure is fixedly connected in place of a welding mode, so that the cost is effectively reduced, the connection is stable and reliable, the maintenance and replacement of internal parts of the gradient exhaust valve are facilitated, and the self-locking clamping hook structure can also reduce welding procedures and sundries such as welding slag caused by the welding procedures.
The working method of the gradient exhaust valve of the embodiment 1 comprises the following steps:
s1: as shown in fig. 10, in the vehicle refueling state, the refueling limit valve is opened, the head valve 4 of the gradient exhaust valve is closed, the bottom of the head valve 4 is abutted against the top of the vent hole structure 25 of the connecting partition plate 23, the vent hole structure 25 is provided with a trickle hole 2511, and the gradient exhaust valve is ventilated only through the trickle hole 2511, so as to maintain a low ventilation state;
s2: under the running state of the vehicle, the oiling limiting valve is closed, and the state of the gradient exhaust valve is as follows:
s21: as shown in fig. 10, when the oil in the oil tank is in a stable state, the head valve 4 of the gradient exhaust valve is closed, the bottom of the head valve 4 is abutted against the top of the vent hole structure 25, and the gradient exhaust valve is only ventilated through the trickle hole 2511 and keeps a low ventilation state;
s22: as shown in fig. 12 and 14, when the oil in the oil tank shakes greatly or the oil tank is in a limit gradient state, the oil in the oil tank enters the valve housing 1 due to shaking, because the gradient exhaust valve adopts a three-wall structure design of the valve housing 1, the float housing 2 and the float inner retaining wall 24, the oil must first bypass 180 degrees from the outer wall of the float housing 2 to the float housing air vent 211 from the valve housing air vent 12, enter the float housing 2 from the float housing air vent 211 and then bypass at least 90 degrees along the float inner retaining wall 24 and then reach the vent structure 25, so that the dynamic leakage of the liquid is close to zero under the dynamic condition, the oil in the valve housing 1 acts together with the air flow to push the float 3 to rise, the float 3 rises, the sealing piece 5 immediately plugs the vent structure 25, and the gradient exhaust valve is sealed; as shown in fig. 10, when the oil in the oil tank is restored to be stable, the air flow is also stable, the float 3 falls down, the vent hole structure 25 is opened, the slope exhaust valve is ventilated through the trickle hole 2511 and keeps in a low ventilation state, so that the excessive pressure of the oil tank is avoided;
s23: as shown in fig. 11, when the fuel vapor increases in the full oil level state or the high temperature state, as the fuel vapor increases, when the internal pressure of the fuel tank reaches 3 to 5kpa, the head valve 4 of the gradient exhaust valve is pushed open, a gap is generated between the head valve 4 and the vent hole structure 25, and the gradient exhaust valve is ventilated through the vent hole structure 25, so that a high-flow ventilation state is maintained.
Further, as shown in fig. 13, the exhaust route of the gradient exhaust valve is: first, fuel vapor enters the valve housing 1 from the valve housing vent 12; secondly, after entering the interior of the valve shell 1, the fuel vapor firstly hits the outer wall of the float shell 2, and because the float shell vent 211 and the valve shell vent 12 form a 180-degree angle at the opposite position, the fuel vapor bypasses 180 degrees from the outer wall of the float shell 2 to the float shell vent 211, and enters the interior of the float shell 2 from the float shell vent 211; in the third step, after the fuel vapor enters the inside of the float housing 2, the fuel vapor hits the float inner retaining wall 24, and then bypasses at least 90 ° along the float inner retaining wall 24 to enter the vent structure 25, and is discharged from the vent structure 25.
Comparative example 1
The gradient exhaust valve of comparative example 1, which was obtained from the company of schrader automobile systems, su zhou, and which was patented, publication number CN 202381778U, is structured as shown in fig. 15.
Comparative example 2
The gradient exhaust valve of the comparative example 2 is composed of Eton GVV-628208, and the structures are shown in FIGS. 16 and 17.
And (3) effect verification:
performance tests of blocking gas flow characteristics, liquid dynamic leakage, and restarting pressure were performed on the slope exhaust valves of the above example 1, comparative example 1, and comparative example 2 according to the following test methods, and the test results are shown in tables 1,2, and 3, and the test methods are as follows:
(1) Blocking gas flow characteristics: and respectively installing the gradient exhaust valves on a test fixture, increasing the ventilation quantity (the pressure increasing rate is not easy to be too high, and the pressure increasing rate is 0.5 kPa/s), and recording the air outlet flow of the gradient exhaust valve at the moment and the pressure difference at the two ends of the corresponding gradient exhaust valve when the pressure difference in the container or the flow of the air outlet of the gradient exhaust valve suddenly changes.
(2) Liquid dynamic leakage: at normal temperature, fixing a fuel tank on a tool for simulating the vehicle body environment, arranging a gradient exhaust valve at the position right in the middle of the upper surface of the tool, adding the national six-gasoline with the RVP value of not less than 60kPa in the corresponding volume, injecting air with a certain flow rate into the system through an oil pump or an opening on the oil tank, sealing other parts except a ventilation joint, and performing a cycle test according to the following steps: 0.5s forward 230mm, stop 5.5s.0.5s 230mm backwards, stop 5.5s, cycle times: 75 times. Two sets of oil mass and ventilation flow tests are required to be carried out, and total leakage in the process of collecting test rings is as follows:
a) The liquid level is 25mm below the closing height of the gradient exhaust valve, the ventilation flow is 10L/min, and the total leakage in the test ring process is collected;
b) And when the liquid level reaches the closing position of the gradient exhaust valve, applying pressure of 6kPa to the test device, and collecting the total leakage amount in the test ring process.
(3) Restarting pressure: after closing the grade exhaust valve at the 90 position, the pressure was increased to 30kPa, the grade exhaust valve was rotated to 0 °, and the pressure was reduced at 1kPa every 5s until the grade exhaust valve reopened, recording the pressure and airflow.
Table 1 blocking gas flow characteristics test data
As can be seen from table 1, when the gas flow rate reaches 75L/min, the gradient exhaust valve of example 1 is blocked, while the gradient exhaust valve of comparative example 1 is blocked when the gas flow rate reaches 44L/min, and the gradient exhaust valve of comparative example 2 is blocked when the gas flow rate reaches 61L/min, which indicates that the gradient exhaust valve of example 1 is far superior to the gradient exhaust valves of comparative example 1 and comparative example 2 in blocking gas flow rate characteristics, so that the vehicle oil tank can be ensured to be more smoothly refueled and exhausted, the application range is wider, and the vehicle can be used for common fuel vehicles and high-pressure hybrid vehicles.
Table 2 liquid dynamic leakage test data
As can be taken from table 2, (1) when the liquid level reaches the closed position of the slope air outlet valve, applying a pressure of 6kPa to the inside of the test device, and collecting the total leakage amount in the test loop, the above-mentioned arrangement is to test the dynamic leakage condition of the liquid when the slope air outlet valve is closed in the state of full oil level of the oil tank, and the total leakage amount of the slope air outlet valves of example 1, comparative example 1 and comparative example 2 is 0; (2) When the liquid level was below the slope exhaust valve closing height +25mm, the ventilation flow was 10L/min, and the total leakage during the test loop was collected, the above setting was to test the dynamic leakage of liquid when the slope exhaust valve was open at less than full oil level, the total leakage of example 1 was 4 mL, and the total leakage of comparative example 1 was 18mL, and the total leakage of comparative example 2 was 10 mL. The above test data shows that the slope exhaust valve of example 1 is far superior to the slope exhaust valves of comparative examples 1 and 2 in terms of liquid dynamic leakage, because the amount of liquid that can flow to the vent structure through the three retaining walls of the valve housing, the float housing, and the retaining wall in the float is very small and negligible, and example 1 achieves that the liquid dynamic leakage in dynamic conditions is near zero, ensuring the sealing performance of the vehicle under various working conditions, and better protecting the fuel tank system and the vehicle running safety.
Table 3 restart pressure test data
The larger the restarting pressure and the restarting flow of the gradient exhaust valve are, the better the restarting pressure and the restarting flow are, and under the condition that a certain restarting pressure is met, the larger the restarting flow is, which means that the gradient exhaust valve can release pressure more rapidly, the guaranteed gradient exhaust valve releases pressure in time, and the safety of an automobile fuel system is guaranteed. As can be seen from table 3, the re-opening pressures of the gradient exhaust valves of example 1, comparative example 1 and comparative example 2 were 17.8 kPa, 21kPa and 17.3 kPa, respectively, and the re-opening flow rates of the gradient exhaust valves of example 1, comparative example 1 and comparative example 2 were 35L/min, 5L/min and 34L/min, respectively, and the combination of the re-opening pressures and the re-opening flow rates of the gradient exhaust valves of example 1 was optimal in view of the combination.
There are many ways in which the invention may be practiced, and what has been described above is merely a preferred embodiment of the invention. It should be noted that the above examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that modifications may be made without departing from the principles of the invention, and such modifications are intended to be within the scope of the invention.

Claims (8)

1. A slope exhaust valve, comprising:
a valve housing (1);
a float housing (2), the float housing (2) being arranged inside the valve housing (1); the float shell (2) comprises a float shell body (21), a head valve accommodating seat (22), a connecting partition plate (23) and a float inner retaining wall (24), wherein the head valve accommodating seat (22), the connecting partition plate (23) and the float shell body (21) are sequentially connected from top to bottom and coaxially arranged, and the float inner retaining wall (24) is arranged in the float shell body (21) and the upper end of the float inner retaining wall is connected with the bottom of the connecting partition plate (23); a vent hole structure (25) is formed in the center of the connecting partition plate (23), and the outer edge of the connecting partition plate (23) is connected with the valve shell (1);
a float (3), the float (3) being slidably disposed inside the float housing body (21) and inside the float inner retaining wall (24);
a head valve (4), the head valve (4) being disposed within a head valve receptacle (22);
a sealing plate (5), the sealing plate (5) being arranged on top of the float (3) and being coaxial with the vent structure (25);
the upper part of the spring (6) is sleeved at the lower part of the floater (3), a spring seat (11) is arranged at the center position of the inner bottom of the valve shell (1), and the lower part of the spring (6) is in butt joint with the inner bottom surface of the spring seat (11);
the float shell body (21) is of a cylindrical structure, a float shell vent (211) is formed in the side wall of the upper part of the float shell body (21), a valve shell vent (12) is also formed in the side wall of the upper part of the valve shell (1), and the float shell vent (211) and the valve shell vent (12) form an angle of 180 degrees at the opposite position;
the vent structure (25) comprises an outer convex ring (251), an inner convex ring (252), a side channel (253) and a vent main channel (254); concentric outer convex rings (251) and inner convex rings (252) are arranged in the center of the top surface of the connecting partition plate (23), gaps (2521) are symmetrically arranged on the left side and the right side of the inner convex rings (252), side channels (253) are arranged between the 2 gaps (2521) and the inner wall of the outer convex rings (251) respectively, and a thin flow hole (2511) is formed in the outer convex rings (251) at the position corresponding to one of the side channels (253); the part of the connecting partition plate (23) in the inner convex ring (252) is provided with a vent hole (231), the lower end of the vent hole (231) is provided with a vent main channel (254), and the lower end of the vent main channel (254) extends to the inside of the float shell body (21).
2. The gradient exhaust valve according to claim 1, wherein the outer diameter of the outer collar (251) is smaller than the outer diameter of the head valve (4); the outer diameter of the inner convex ring (252) is 6-7 mm, and the inner diameter of the inner convex ring is 5-6 mm; the heights of the outer convex ring (251) and the inner convex ring (252) are 0.5-1.5 mm; the cross-sectional area of the thin flow hole (2511) is (0.3-0.6) × (0.6-1.2) mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The diameter of the ventilation main channel (254) is 3.3-3.6 mm, and the length of the ventilation main channel is 3-6 mm.
3. The gradient exhaust valve according to claim 1, wherein the float inner retaining wall (24) is of an annular structure, and a plurality of vertical sliding ribs (241) are uniformly arranged on the inner wall of the side wall of the float inner retaining wall (24) and matched with the sliding of the float (3); the side wall of the float inner retaining wall (24) is provided with 3 vertical openings (242), wherein one opening (242) forms an angle of 180 degrees with the float outer shell vent (211) at the opposite position, and the other 2 openings (242) form an angle of 90 degrees with the float outer shell vent (211) at the opposite position respectively; and vertical guide ribs (243) are arranged at the bottoms of the 1 or more sliding ribs (241).
4. A gradient exhaust valve according to claim 3, wherein the outer diameter of the float inner retaining wall (24) is 25-30 mm, and the height of the float inner retaining wall (24) is 15-20 mm; the inner diameter of the sliding ribs (241) is 20-24 mm, and the height of the sliding ribs (241) is 15-20 mm; the cross-sectional area of the opening (242) is (4-5) × (15-20) mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The height of the guide rib (243) is 2-10 mm.
5. The grade exhaust valve of claim 1, further comprising:
and the O-shaped ring (7) is arranged on a sealing surface (221) on the outer side surface of the head valve accommodating seat (22).
6. The gradient exhaust valve according to claim 1, characterized in that the outer edge of the connecting partition plate (23) is provided with a plurality of buckling holes (232), the top of the valve housing (1) is provided with a plurality of self-locking buckles (13) matched with the buckling holes (232), and the valve housing (1) and the float housing (2) are assembled in a buckling manner and self-locked after assembly; the outer edge of the connecting partition plate (23) is also provided with an inner shell window (233), and the inner shell window (233) corresponds to the float outer shell vent (211).
7. The method of operating a slope exhaust valve according to any one of claims 1 to 6, comprising the following:
s1: in a vehicle refueling state, a refueling limit valve is opened, a head valve (4) of a gradient exhaust valve is closed, the bottom of the head valve (4) is abutted with the top of a vent hole structure (25) connected with a partition plate (23), the vent hole structure (25) is provided with a thin flow hole (2511), and the gradient exhaust valve is ventilated only through the thin flow hole (2511) to keep a low ventilation state;
s2: under the running state of the vehicle, the oiling limiting valve is closed, and the state of the gradient exhaust valve is as follows:
s21: when the oil in the oil tank is in a stable state, a head valve (4) of the gradient exhaust valve is closed, the bottom of the head valve (4) is abutted with the top of the vent hole structure (25), and the gradient exhaust valve is ventilated only through a fine flow hole (2511) and keeps a low ventilation state;
s22: when the oil in the oil tank shakes greatly or the oil tank is in a limit gradient state, the oil in the oil tank enters the valve shell (1) due to shaking and pushes the floater (3) to ascend together with air flow, the floater (3) ascends, the sealing piece (5) immediately plugs the vent hole structure (25), the gradient exhaust valve is sealed, the air flow is stable when the oil in the oil tank is recovered stably, the floater (3) descends, the vent hole structure (25) is opened, and the gradient exhaust valve is ventilated through the tiny flow hole (2511) and keeps a low ventilation state;
s23: when the fuel vapor increases in a full oil level state or a high temperature state, as the fuel vapor increases, when the internal pressure of the fuel tank reaches 3-5 kPa, a head valve (4) of the gradient exhaust valve is jacked up, a gap is formed between the head valve (4) and a vent hole structure (25), and the gradient exhaust valve is ventilated through the vent hole structure (25) to maintain a high-flow ventilation state.
8. The method of operating a gradient exhaust valve according to claim 7, wherein the exhaust route of the gradient exhaust valve is: firstly, fuel vapor enters the valve housing (1) from a valve housing vent (12); secondly, after entering the interior of the valve shell (1), fuel steam firstly hits the outer wall of the float shell (2), and because the float shell vent (211) and the valve shell vent (12) form an angle of 180 degrees at the relative position, the fuel steam bypasses the outer wall of the float shell (2) to the float shell vent (211) by 180 degrees, and enters the interior of the float shell (2) from the float shell vent (211); and thirdly, after the fuel vapor enters the interior of the float shell (2), the fuel vapor hits the float inner retaining wall (24) and then bypasses at least 90 degrees along the float inner retaining wall (24) to enter the vent hole structure (25) and is discharged from the vent hole structure (25).
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1349598A (en) * 1999-03-11 2002-05-15 拉维夫精密注射器成型公司 Over filling interdiction, vent and roll over valve
CN105980751A (en) * 2014-02-12 2016-09-28 株式会社利富高 Valve device
CN108131482A (en) * 2017-12-30 2018-06-08 亚普汽车部件股份有限公司 A kind of new-type oil tank liquid level control air bleeding valve
CN110566700A (en) * 2019-10-15 2019-12-13 斯丹德汽车系统（苏州）有限公司 slope discharge valve
CN211203005U (en) * 2019-10-15 2020-08-07 斯丹德汽车系统（苏州）有限公司 Slope discharge valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1349598A (en) * 1999-03-11 2002-05-15 拉维夫精密注射器成型公司 Over filling interdiction, vent and roll over valve
CN105980751A (en) * 2014-02-12 2016-09-28 株式会社利富高 Valve device
CN108131482A (en) * 2017-12-30 2018-06-08 亚普汽车部件股份有限公司 A kind of new-type oil tank liquid level control air bleeding valve
CN110566700A (en) * 2019-10-15 2019-12-13 斯丹德汽车系统（苏州）有限公司 slope discharge valve
CN211203005U (en) * 2019-10-15 2020-08-07 斯丹德汽车系统（苏州）有限公司 Slope discharge valve

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