CN214946598U

CN214946598U - Valve and multifunctional combined valve

Info

Publication number: CN214946598U
Application number: CN202022774351.1U
Authority: CN
Inventors: 朱晓通
Original assignee: Aiyi Intelligent Automobile Technology Jiaxing Co ltd
Current assignee: Yingzhi Aiyi Intelligent Automobile Technology Jiaxing Co ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-11-30
Anticipated expiration: 2030-11-26

Abstract

The utility model discloses a valve and many function combination valve, this valve can realize simultaneously in the fuel tank refuel the function of limit valve and upset valve. The valve body is internally provided with a valve core accommodating cavity, and a first inflow channel, a second inflow channel, a first exhaust port and a second exhaust port which are communicated with the valve core accommodating cavity are arranged. The valve core accommodating cavity is internally provided with a first valve core assembly and a second valve core assembly which independently slide vertically and are used for opening and closing the first discharge port and the second discharge port. The pressure maintaining part is connected with the second discharge port and contains a certain opening pressure; after the first valve core assembly closes the first discharge port and the valve core accommodating cavity needs to reach a certain pressure value, the pressure maintaining part can open the second discharge port, and the fluid can flow out of the second discharge port. The two valve core assemblies can realize different functions and do not influence each other, the combination valves with different technical requirements can be obtained by respectively adjusting the performances of the two valve cores, and the problem that the two valve cores influence each other in the existing combination valve is solved.

Description

Valve and multifunctional combined valve

Technical Field

The utility model belongs to the technical field of the valve, especially, relate to a valve and many function combination valve.

Background

Fuel tanks currently on the market generally have these two requirements: 1. limited fueling (no overfill); 2. the fuel tank may be vented normally in certain circumstances: when positive pressure exists in the fuel tank, the pressure can be timely relieved, or when negative pressure exists in the fuel tank, air can be timely supplied to the fuel tank. In order to meet the above requirements of a fuel tank, a fuel tank is generally provided with a filling limit valve and at least one rollover valve. The slow market has appeared some new designs, a fuel tank valve can satisfy above-mentioned two functional requirements simultaneously, integrates the function of two valves on a product, just so can reduce the quantity of the valve that the fuel tank needs the configuration, also layout on the fuel tank is easier, we generally call the combination valve, just that refuel limit valve and upset valve have been in the same place, make a product possess both functions simultaneously.

With the issuance of the 'national six' regulation, the evaporative emission requirement of the whole fuel system is more and more strict, the requirement on the dynamic leakage (generally comprising a horizontal shaking test, an angle overturning shaking test, a six-axis shaking test and the like) of the fuel tank is also improved, so that the design of the valve is tested to a certain extent, no matter whether the valves are refueling limit valves or overturning valves or combination valves, because the valves are all installed and fixed on the fuel tank, the valve core is communicated with the inside of the fuel tank, and the pipe orifice of the valve is generally connected to a carbon tank through a pipeline. When the vehicle fluctuates in the running process, fuel in the fuel tank can also surge, and if the valve core in the valve can not seal the exhaust channel in time, the fuel can turn out of the valve exhaust channel with a certain probability and flows out through the pipe orifice to form a leakage phenomenon.

The combination valves on the market currently have two kinds, one is: the combined valve is relatively large, one side of the combined valve is a valve core of the refueling limiting valve, the other side of the combined valve is a valve core of the rollover valve, the two valve cores are not interfered with each other, but the combined valve is larger than a common refueling limiting valve due to the fact that the two valve cores are separated, so that the cost is relatively high, and the layout on a fuel tank is relatively difficult. Another is that: the size of the combined valve is similar to that of a common oiling limit valve, a valve core of the oiling limit valve and a valve core of a turnover valve are stacked together, a small floater is stacked on a large floater, the function of the oiling limit valve is realized corresponding to the small floater, and the function of the turnover valve is realized corresponding to the large floater. However, in this design, because the two valve cores are stacked together, the functions of the two corresponding valve cores will also affect each other, and if one valve core needs to be adjusted, the performance of the other valve core may be affected, which has a great limitation on adjusting the performance of the whole valve core.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a valve and many function combination valve to solve the problem that two case influence each other in the current combination valve.

In order to solve the above problem, the technical scheme of the utility model is as follows:

the utility model relates to a valve, which comprises a valve body, a valve core part and a pressure maintaining part;

a valve core accommodating cavity is arranged in the valve body; the valve body is provided with a first inflow channel and a second inflow channel which are communicated with the valve core accommodating cavity and the outer space of the valve body, and the inlet of the second inflow channel is higher than the inlet of the first inflow channel; the upper end of the valve body is provided with a first discharge port and a second discharge port which are communicated with the valve core accommodating cavity;

the valve core part comprises a first valve core assembly and a second valve core assembly;

the first valve core assembly and the second valve core assembly are respectively and vertically connected with the valve core accommodating cavity in a sliding manner and are respectively used for opening and closing the first discharge port and the second discharge port;

the pressure maintaining part is arranged on the top surface of the valve body, and an input end of the pressure maintaining part is communicated with the second discharge port and used for limiting the pressure required by discharging fluid from the second discharge port;

after the first valve core assembly is matched to close the first discharge port, after the fluid in the valve core accommodating cavity needs to reach a certain pressure value, the pressure maintaining part can open the second discharge port, the fluid can be discharged from the second discharge port to realize the function of the turnover valve, the two valve core assemblies realize different functions and do not influence each other, and meanwhile, the combination valves with different technical requirements can be obtained by respectively adjusting the two valve core assemblies.

The valve of the utility model, the valve core part further comprises a sealing component, the sealing component is arranged at the top end of the valve core accommodating cavity or vertically slides in the valve core accommodating cavity and is used for matching with the first valve core component to open and close the first discharge port; and the sealing assembly is also provided with a communication channel for communicating the second discharge port with the second inflow channel and is used for matching with the second valve spool assembly to open and close the second discharge port.

In the valve of the present invention, the sealing component is disposed on the top surface of the valve element accommodating chamber, and the sealing component is a sealing member; the sealing elements are arranged at the first discharge port and the second discharge port;

the sealing element forms a communication channel for communicating the first discharge port with the valve core accommodating cavity and is used for matching with the first valve core assembly to open and close the first discharge port; the sealing element forms a communication channel for communicating the second discharge port with the valve core accommodating cavity and is used for matching with the second valve core assembly to open and close the second discharge port.

In the valve of the present invention, the sealing assembly is slidably connected to the valve element accommodating chamber, and the sealing assembly includes a sliding member and a sealing member;

the sliding piece is connected with the valve core accommodating cavity in a sliding mode, and the sealing piece is installed on the sliding piece; the sealing element is provided with a sealing block for sealing the first discharge port and a communication channel for communicating the second discharge port;

the sliding piece is driven by the first valve core assembly to slide up and down and is matched with the sealing block to open and close the first exhaust port; and the communication channel communicated with the second discharge port is used for matching with the second valve core assembly to open and close the second discharge port.

The valve of the utility model also comprises a connecting flange; the connecting flange is connected with the valve body and matched with the top surface of the valve body to form a fluid discharge chamber used for guiding the fluid discharged from the first discharge port and the pressure maintaining part.

The valve body of the valve of the utility model comprises a shell with an upward opening and a switching shell with a downward opening; the shell is sleeved at the lower end of the switching shell and is fixedly connected with the switching shell;

the inner wall surface of the adapter shell is matched with the bottom surface of the shell to form the valve core accommodating cavity; the shell of the shell is provided with at least one first connecting port, and the first connecting port, the outer wall surface of the switching shell and the inner wall surface of the shell are matched to form a third inflow channel communicated with the valve core accommodating cavity;

the shell of the adapter shell is provided with at least one second connecting port communicated with the valve core accommodating cavity, and the first connecting port and the second connecting port are matched to form the first inflow channel;

the shell is provided with at least one third connecting port, the shell of the adapter shell is provided with at least one fourth connecting port communicated with the valve core accommodating cavity, and the third connecting port, the fourth connecting port and the communication channel of the sealing component are matched to form the second inflow channel.

In the valve of the utility model, the inner wall surface of the transfer shell is provided with a plurality of vertically arranged first guide slide rails, and the first valve core assembly is connected with the first guide slide rails in a sliding manner;

a hollow part is arranged on the bottom surface of the inner cavity of the shell, the hollow part and the bottom surface of the inner cavity are matched to form a vertical guide groove, and a plurality of second guide slide rails which are vertically arranged are arranged on the inner wall surface of the hollow part; the second valve spool assembly is slidably connected to the second guide slide.

In the valve of the present invention, the first valve core assembly includes a first float and a first elastic member; the first floater is connected with the valve core accommodating cavity in a sliding mode, and two ends of the first elastic piece are connected with the first floater and the bottom surface of the valve core accommodating cavity respectively.

The valve of the utility model, the second valve core component comprises a second floater, a second elastic element and a moving element; the second floater is connected with the valve core accommodating cavity in a sliding manner, and two ends of the second elastic piece are respectively connected with the second floater and the bottom surface of the valve core accommodating cavity; the movable piece is movably connected to the top surface of the second floater and is used for being matched with the sealing assembly to open and close the second discharge port.

In the valve of the utility model, the pressure maintaining part comprises a pressure maintaining shell and a pressure maintaining cover; an accommodating space is arranged in the pressure maintaining shell, and an inflow hole and a discharge hole which are communicated with the accommodating space are also arranged on the pressure maintaining shell; the pressure maintaining shell is arranged on the top surface of the valve body, and the inflow hole is communicated with the second discharge port; the pressure-retaining cover is connected to the accommodating space in a sliding manner and used for opening and closing the inflow hole.

The utility model discloses a valve, be equipped with the separation piece on the third inflow passageway, be used for the restriction inflow passageway's flow area.

The utility model discloses a valve, be equipped with the recess of going up the concave on the bottom surface of shell, the recess with second valve core subassembly is corresponding, is used for raising the minimum sliding height of second valve core subassembly.

The utility model discloses a many function combination valve includes above-mentioned arbitrary one the valve.

The utility model discloses owing to adopt above technical scheme, make it compare with prior art and have following advantage and positive effect:

1. in one embodiment of the present invention, the valve body is provided with the valve core accommodating cavity, and the valve body is provided with the first inflow channel, the second inflow channel, the first discharge port and the second discharge port which are communicated with the valve core accommodating cavity; the two inflow channels are used for guiding external fluid to flow into the valve core accommodating cavity, and the two discharge ports are used for discharging the fluid in the valve core accommodating cavity. The valve core accommodating cavity is internally provided with a first valve core assembly and a second valve core assembly which independently vertically slide and are respectively used for opening and closing the first discharge port and the second discharge port so as to achieve the function of an oil filling limit valve. The pressure maintaining part is connected with the second discharge port and internally provided with a certain opening pressure for limiting the fluid discharged through the second discharge port, and after the first discharge port is closed by matching with the first valve core assembly, the fluid in the valve core accommodating cavity needs to reach a certain pressure value, the pressure maintaining part can open the second discharge port, and the fluid can realize the second discharge port, so that the function of the turnover valve is realized. The two valve core assemblies can realize different functions and are not influenced mutually, and meanwhile, the combination valves with different technical requirements can be obtained by respectively adjusting the performances of the two valve cores, so that the problem that the two valve cores are influenced mutually in the existing combination valve is solved. Meanwhile, the two valve core assemblies are designed in one valve core accommodating cavity, so that the size of the valve is reduced, and the layout of the valve in a fuel tank is facilitated.

2. The utility model discloses an in the embodiment, further set up seal assembly in the valve body for open and close the operation with two case subassembly cooperations to two discharge ports respectively, with the leakproofness that improves the valve. The sealing assembly can slide in the valve core accommodating cavity or be fixedly arranged at the two outlet ports, the arrangement mode is flexible and changeable, and different arrangement modes can be adopted according to different technical requirements. Meanwhile, after the valve is used for a long time, when the sealing effect of the valve is insufficient, only the sealing assembly needs to be replaced.

3. The utility model discloses an in the embodiment, through set up first direction slide rail on the internal face at the switching shell, set up cavity spare in the inner chamber bottom surface of shell and form the guide way with the cooperation, be provided with second direction slide rail on this cavity spare's the internal face. The first guide slide rail and the second guide slide rail are respectively in sliding connection with the first valve core assembly and the second valve core assembly and used for limiting the vertical movement of the two valve core assemblies. The movable amount of case subassembly is injectd to the fit clearance of accessible design sliding connection department, can reduce the area of contact of case subassembly and between the part that contacts at the activity in-process simultaneously, reduces frictional force each other for the case subassembly is more nimble at the activity in-process, easily opens and closes the discharge port that corresponds.

4. The utility model discloses an embodiment has set up the moving part at the top of second float, rises to the closed position when the second float, closes the second discharge port by the moving part with the cooperation of seal assembly. The combination of the movable member and the second float can make the sealed second discharge port more easily opened.

5. In one embodiment of the present invention, the pressure maintaining portion includes a pressure maintaining shell and a pressure maintaining cover that slides in the pressure maintaining shell. After the first discharge port is closed, the pressure in the valve core accommodating cavity is continuously increased, the fluid can be discharged from the second discharge port only, and the pressure maintaining part is arranged at the outlet of the second discharge port and limits the second discharge port at a certain pressure. When the pressure in the valve core accommodating cavity reaches the required pressure, the pressure maintaining cover slides and is opened in the pressure maintaining shell, and the fluid in the valve core accommodating cavity can be discharged through the pressure maintaining shell, so that the function of the turnover valve is realized.

6. The utility model relates to an embodiment has set up the separation piece on the third inflow channel, when a large amount of fluids got into case holding chamber through the third inflow channel, can play and form the effect of relative isolation between outside fluid and the inside case, produces certain separation effect to the fluid, avoids the fluid to gush in a large number and leads to the case subassembly to close prematurely. In addition, under the abominable operating mode such as rocking the range greatly, fluid can get into case holding chamber through the third inflow channel because of the reason of rocking, and at this moment the design of separation piece can make fluid and case holding chamber keep apart relatively equally, and less entering case holding intracavity of fluid reduces and rocks the influence of operating mode such as waiting to the case subassembly, and simultaneously, the fluid that gets into case holding intracavity is less, and at the dynamic in-process, the probability that fluid leaked from the valve body will greatly reduced.

7. The utility model discloses an embodiment has set up the recess of going up the concave in the bottom of shell surface, for a kind raises the design, has raised the minimum slide position of second float for after the fluid that gets into case holding intracavity need reach the take the altitude, just can make the second float receive sufficient buoyancy and rise, avoided the too early condition of rising and closing the second discharge port of second float. Meanwhile, because the second floater is at a higher position, when the valve core is in working conditions such as shaking, fluid which can enter the valve core accommodating cavity and impact the second floater is relatively less, and the leakage problem under the dynamic condition is improved to a certain extent. In addition, the lifting design sets up for open-ended recess, can form the air chamber in groove, protects the second valve core subassembly with the bottom surface cooperation of shell, reduces the impact of fluid.

Drawings

FIG. 1 is a cross-sectional view of a valve of the present invention;

FIG. 2 is another cross-sectional view of the valve of the present invention;

FIG. 3 is a cross-sectional view of the first and second floats of the valve of the present invention;

FIG. 4 is a schematic view of the top surface of the adaptor housing of the valve of the present invention;

FIG. 5 is a schematic view of a first discharge port and a second discharge port of the valve of the present invention;

FIG. 6 is a schematic view of a sealing member of the valve of the present invention;

FIG. 7 is another schematic view of a sealing member of the valve of the present invention;

FIG. 8 is another schematic view of a sealing member of the valve of the present invention;

fig. 9 is a schematic view of the operation of the valve of the present invention;

FIG. 10 is a schematic view of another embodiment of the valve of the present invention;

FIG. 11 is a schematic view of another embodiment of the valve of the present invention;

FIG. 12 is a schematic view of another embodiment of the valve of the present invention;

FIG. 13 is a schematic view of another embodiment of the valve of the present invention;

FIG. 14 is a schematic view of another embodiment of the valve of the present invention;

FIG. 15 is a schematic view of another embodiment of the valve of the present invention;

FIG. 16 is a schematic view of another embodiment of the valve of the present invention;

figure 17 is a schematic view of an alternative to the pressure maintaining portion of the valve of the present invention;

fig. 18 is a schematic view of another alternative embodiment of the pressure retaining portion of the valve of the present invention.

Description of reference numerals: 1: a connecting flange; 2: a transfer shell; 201: a first guide rail; 202: a middle extension ring; 203: a small extension ring; 3: a seal ring; 4: a housing; 401: a hollow member; 402: a second guide slide rail; 5: a first float; 501: a first chute; 6: a first elastic member; 7: a second float; 701: a second chute; 8: a second elastic member; 9: a seal assembly; 901: a seal member; 9011: a large seal ring; 9012: a middle seal ring; 9013: a small seal ring; 902: a slider; 10; a movable member; 11: a pressure-maintaining cover; 12: a pressure maintaining shell; 13: a first discharge port; 14: a second discharge port; 15: a first connection port; 16: a second connection port; 17: a third connection port; 18: a fourth connection port; 19: a valve core accommodating cavity; 20: a raising structure; 21: a barrier; 22: and a third inflow channel.

Detailed Description

The valve and the multifunctional combination valve provided by the invention are further described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more fully apparent from the following description and appended claims.

Example one

The embodiment is mainly a valve capable of realizing the functions of a refueling metering valve and a turnover valve at the same time, and is applied to a fuel tank, and fluid in the fuel tank is oil and gas in the fuel tank.

Referring to fig. 1, 2, 4 and 5, the valve of the present embodiment includes a valve body, a valve core portion, and a pressure retaining portion.

The valve body is internally provided with a valve core accommodating cavity 19, the valve body is provided with a first inflow channel and a second inflow channel which are communicated with the valve core accommodating cavity 19 and the outer space of the valve body, and the inlet of the second inflow channel is higher than that of the first inflow channel. The first inflow channel is mainly used for inflow of oil and gas, and the second inflow channel is mainly used for inflow of gas.

The upper end of the valve body is provided with a first discharge port 13 and a second discharge port 14 which communicate with the spool accommodating chamber 19. Two discharge ports are used for discharging the fluid in the spool accommodating chamber 19. The pressure maintaining part is arranged on the top surface of the valve body, and the input end is communicated with the second discharge port 14 and used for limiting the pressure required by discharging the fluid from the second discharge port 14.

The valve core part comprises a first valve core assembly and a second valve core assembly. The first valve core assembly and the second valve core assembly are respectively and vertically connected with the valve core accommodating cavity 19 in a sliding mode and are respectively used for opening and closing the first discharge port 13 and the second discharge port 14.

Wherein, the switches of the two discharge ports are matched to achieve the function of the oil filling limit valve. Namely, when the oil continuously flows into the valve core accommodating cavity 19, the gas entering the valve body is discharged through the two discharge ports, and meanwhile, the first discharge port 13 and the second discharge port 14 are sequentially closed according to the inflow of the oil, so that the oil is prevented from being discharged to cause leakage.

The pressure maintaining part and the first valve core assembly are matched to close the first discharge port 13, so that the fluid in the valve core accommodating cavity 19 can flow out of the pressure maintaining part only when reaching a certain pressure value, and the function of the turnover valve is realized. The rollover valve is generally applied to the situation that the fuel tank is full or the vehicle has a certain inclination angle, namely the first valve core assembly is lifted to close the first discharge port 13, but the second valve core assembly is not lifted, and the second discharge port 14 is in an open state, at the moment, the whole valve is in a relatively sealed state due to the arrangement of the pressure retaining part, and the pressure in the fuel tank is continuously increased due to the volatilization or temperature rise of the oil in the fuel tank, so that the function of the rollover valve is required to relieve the pressure. When the pressure in the fuel tank rises to the opening pressure of the pressure maintaining part, the pressure maintaining part can be opened, so that the gas is discharged through the second discharge port 14 and the pressure maintaining part, and the internal pressure is relieved.

Different functions can be realized through the cooperation between two case subassemblies to this embodiment, and do not influence each other, and the performance of two case of accessible adjustment respectively obtains the combination valve of different technical demands simultaneously, has solved the problem that two case influence each other in the current combination valve.

The specific structure of the valve of the present embodiment is further described below:

in the present embodiment, the cross-sectional area of the first discharge port 13 and the cross-sectional area of the second discharge port 14 are not particularly limited. Based on the functions of a refueling limit valve and a rollover valve required by the fuel tank, the functions of the refueling limit valve can be realized by the switch matching of the first discharge port 13 and the second discharge port 14, and the functions of the rollover valve can be realized by the switch matching of the first discharge port 13 and the pressure maintaining part, so that the cross-sectional area of the first discharge port 13 is larger than that of the second discharge port 14, but the cross-sectional area can be actually determined according to the required technical requirements, and is not specifically limited herein.

In this embodiment, the valve core portion may further include a sealing assembly 9, and the sealing assembly 9 is disposed at a top end of the valve core accommodating cavity 19 or vertically slides in the valve core accommodating cavity 19, and is used for matching with the first valve core assembly to open and close the first discharge port 13. The sealing assembly 9 is further provided with a communication passage for communicating the second discharge port 14 with the second inflow passage, and the communication passage is used for matching with the second valve core assembly to open and close the second discharge port 14. It will be specifically understood that the sealing assembly 9 is provided so that when the first valve core assembly is raised to the closed position, the sealing assembly 9 closes the first outlet port 13 and also cooperates with the second outlet port 14 to form a communication passage which cooperates with the sealing assembly 9 to close when the second valve core assembly is raised. Namely, the two valve core assemblies respectively open and close the two discharge ports through the same sealing assembly 9.

And a sealing assembly 9 is further arranged in the valve body and is used for being matched with the two valve core assemblies respectively to open and close the two discharge ports, so that the sealing property of the valve is improved. The sealing assembly 9 can be arranged in the valve core accommodating cavity 19 in a sliding mode, and can also be fixedly arranged at two exhaust ports, the arrangement mode is flexible and changeable, and different arrangement modes can be adopted according to different technical requirements. Meanwhile, after a long period of use, when the sealing effect of the valve is insufficient, only the sealing assembly 9 needs to be replaced.

In this embodiment, the valve may further include a connecting flange 1 for connecting with an external pipeline, and the gas discharged from the two discharge ports is guided to the external pipeline for treatment. The connecting flange 1 can be sleeved on the valve body and matched with the top surface of the valve body to form a fluid discharge chamber, and the first discharge port 13 and the pressure maintaining portion are located in the fluid discharge chamber and used for guiding the fluid discharged by the first discharge port 13 and the pressure maintaining portion. The connection mode of the connecting flange 1 and the valve body can be welding or other fixed connection modes, and a sealing ring 3 is further adopted for sealing when necessary.

In the present embodiment, the valve body may specifically include an upward-opening outer housing 4 and a downward-opening transition housing 2. The shell 4 is sleeved at the lower end of the adapter shell 2 and is fixedly connected with the adapter shell 2. The inner wall surface of the adapter shell 2 is matched with the bottom surface of the inner cavity of the shell 4 to form a valve core accommodating cavity 19.

The housing of the outer shell 4 is provided with at least one first connection port 15, and the first connection port 15, the outer wall surface of the adapter shell 2 and the inner wall surface of the outer shell 4 cooperate to form a third inflow channel 22 communicating with the valve core accommodating cavity 19. That is, after the oil liquid enters the inside of the housing 4 through the first connecting port 15, the oil liquid can flow to the bottom surface of the inner cavity of the housing 4 through the gap between the housing 4 and the adapter housing 2 under the action of gravity, so that the valve core accommodating cavity 19 is gradually filled, and the first valve core assembly and the second valve core assembly are provided with the lifted buoyancy.

The shell of the adapter shell 2 is provided with at least one second connecting port 16 communicated with the valve core accommodating cavity 19, and the first connecting port 15 and the second connecting port 16 are matched to form a first inflow channel. The second connection port 16 is usually required to be located higher than the first connection port 15 so as to prevent the oil flowing through the first connection port 15 from entering the spool housing chamber 19 through the second connection port 16. In the case of an increase in the pressure in the fuel tank, the gas enters the valve element accommodating chamber 19 through the first inflow passage and is discharged through the first discharge port 13 and the second discharge port 14 at the top to reduce the pressure in the fuel tank.

The shell 4 is provided with at least one third connecting port 17, the shell of the adapter shell 2 is provided with at least one fourth connecting port 18 communicated with the valve core accommodating cavity 19, and the third connecting port 17, the fourth connecting port 18 and a communication channel of the sealing assembly 9 are matched to form a second inflow channel. The third connection port 17 and the fourth connection port 18 are required to be higher than the first inflow channel, preferably close to the top of the housing 4 and the adaptor housing 2, so that when the oil level in the valve core accommodating cavity 19 is high, the gas in the fuel tank can still flow into the valve core accommodating cavity 19 through the second inflow channel, and forms pressure on the pressure maintaining part through the second discharge port 14, so as to open the pressure maintaining part to discharge the gas.

Further, the first connection port 15, the second connection port 16, the third connection port 17 and the fourth connection port 18 may be through holes respectively disposed on the outer shell 4 or the adaptor shell 2, and the specific size and shape may be determined according to actual requirements, and are not limited in detail herein.

In this embodiment, the first valve core assembly corresponds to the first discharge port 13, and specifically may include the first float 5 and the first elastic member 6. The first floater 5 is slidably connected to the valve core accommodating cavity 19, and two ends of the first elastic element 6 are respectively connected with the first floater 5 and the bottom surface of the valve core accommodating cavity 19. An accommodating groove with an opening facing the first floater 5 can be formed in the first floater 5, so that the first elastic piece 6 can extend into the first floater 5 to be connected with the first floater 5, and the volume of the first valve core assembly is further reduced.

The second valve core assembly corresponds to the second discharge port 14, and may specifically include a second float 7, a second elastic element 8, and a movable element 10. The second float 7 is slidably connected to the valve core accommodating cavity 19, and two ends of the second elastic member 8 are respectively connected to the second float 7 and the bottom surface of the valve core accommodating cavity 19. The movable member 10 is movably connected to the top surface of the second float 7 and is used for matching with the sealing assembly 9 to open and close the second discharge port 14, and the combination of the movable member 10 and the second float 7 can make the sealed second discharge port 14 easier to open. Similarly, the second float 7 may have a downwardly opening receiving groove formed therein for connection with the second elastic member 8 to reduce the volume of the second spool assembly.

The first elastic member 6 and the second elastic member 8 may be springs, and the elastic force may be determined according to the gravity of the float and the lifting force of the float. In other embodiments, the two elastic members may also be elastic elements such as elastic rubber, and are not limited in particular.

Preferably, the first float 5 can be an annular float, the second float 7 can be a cylindrical float or an annular float with a diameter smaller than the inner diameter of the first float 5, and the first float 5 is sleeved on the second float 7 after being slidably connected to the valve core accommodating groove, so that the internal space of the valve is fully utilized, and the volume of the valve is further reduced. In this case, the second discharge port 14 may be a plurality of discharge holes provided on the top surface of the inner cavity of the adaptor housing 2, and the first discharge port 13 may be a plurality of discharge holes surrounding the second discharge port 14.

Referring to fig. 3, in the present embodiment, the first float 5 and the second float 7 are slidably connected to the spool accommodating chamber 19. The specific connection mode is as follows:

the inner wall surface of the transfer shell 2 can be provided with a plurality of vertically arranged first guide slide rails 201, and the first floater 5 is provided with corresponding first slide grooves 501 which are connected with the first guide slide rails 201 in a sliding manner through the first slide grooves 501.

The sliding mode of the second floater 7 is complicated, the first floater 5 and the second floater 7 are not affected with each other, but the second floater 7 needs to be arranged in the inner ring of the first floater 5, so a hollow part 401 needs to be arranged on the bottom surface of the inner cavity of the shell 4, the hollow part 401 and the bottom surface of the inner cavity are matched to form a vertical guide groove, and a plurality of second guide sliding rails 402 which are vertically arranged are arranged on the inner wall surface of the hollow part 401. The second float 7 is provided with a corresponding second sliding chute 701, and is slidably connected to the second guide sliding rail 402.

In practical implementation, the movement of the valve core assembly can be limited by designing the fit clearance at the sliding connection part, meanwhile, the contact area between the valve core assembly and the contacted parts in the movement process can be reduced, and the mutual friction force is reduced, so that the valve core assembly is more flexible in the movement process and is easy to open and close the corresponding discharge port.

Further, the slide rail and the slide groove may be interchanged, and taking the first float 5 as an example, the first slide groove 501 may be provided on the inner wall surface of the transfer case 2, and the first guide slide rail 201 may be provided on the first float 5.

In the present embodiment, the pressure holding section specifically includes a pressure holding case 12 and a pressure holding cover 11. An accommodating space is arranged in the pressure maintaining shell 12, and an inflow hole and an exhaust hole which are communicated with the accommodating space are also arranged on the pressure maintaining shell 12. The pressure maintaining case 12 is provided on the top surface of the valve body, and the inflow hole communicates with the second discharge port 14. The pressure-retaining cover 11 is slidably connected to the accommodating space and used for opening and closing the inflow hole. That is, the pressure-retaining cover 11 is pressed against the inlet hole of the accommodating space by its own weight to close the inlet hole, and after the gas pressure in the valve element accommodating cavity 19 reaches a value that can counteract the weight of the pressure-retaining cover 11, the pressure-retaining cover 11 can be pushed to rise, so that the gas can enter the accommodating space through the inlet hole and be discharged to the fluid discharge chamber formed by the connecting flange 1 through the discharge hole.

Example two

Referring to fig. 6 to 8, the present embodiment further illustrates several preferred embodiments of the sealing assembly 9 based on the first embodiment:

in this embodiment, the sealing assembly 9 may be divided into two configurations, the first configuration is disposed on the top surface of the inner cavity of the valve plug accommodating cavity 19, and the second configuration is slidably connected in the valve plug accommodating cavity 19.

First, the first case is explained, specifically as follows:

the sealing assembly 9 may specifically be a plurality of sealing members 901 respectively sleeved at the first discharge port 13 and the second discharge port 14, and each sealing member 901 has a sealing ring extending into the valve element accommodating cavity 19, and the sealing rings may respectively communicate the valve element accommodating cavity 19 with the first discharge port 13 or the second discharge port 14. At this time, the first float 5 rises to contact and seal the sealing ring corresponding to the first discharge port 13, and partitions the spool housing chamber 19 and the first discharge port 13, thereby closing the first discharge port 13. Similarly, the second float 7 can contact and seal with the sealing ring corresponding to the second discharge port 14 when lifted, and the valve core accommodating cavity 19 and the second discharge port 14 are separated, so that the second discharge port 14 is closed.

Next, a second case, which can be implemented in many ways, is described based on the first embodiment in which the first float 5 is sleeved on the second float 7, and the first discharge port 13 and the second discharge port 14 have the same center, so as to illustrate a part of the example, and it is easy to understand that the following details are provided:

the overall idea is that the sealing assembly 9 comprises a sliding member 902 and a sealing member 901, the sliding member 902 is used for being slidably connected with the spool accommodating cavity 19, and the sealing member 901 is arranged on the sliding member 902 and is used for being matched with the two floats to open and close the two discharge ports. The slider 902 and the sealing member 901 may be separate and assembled together, or may be integrally formed. The structure of the slider 902 portion is conventional, and the following is mainly a description of the specific arrangement of the seal 901:

the first implementation mode comprises the following steps: the seal 901 is an annular seal 901, and an inner ring of the annular seal 901 corresponds to the second discharge port 14. The upper end face of the annular sealing member 901 is provided with a large sealing ring 9011 and a middle sealing ring 9012.

The radius of the large sealing ring 9011 needs to be larger than the maximum radius of the first discharge port 13, and the radius of the middle sealing ring 9012 needs to be smaller than the minimum radius of the first discharge port 13 and the maximum radius of the second discharge port 14. This is provided to ensure that when the sealing member 901 is in the closed position, it can be tightly attached to the wall surfaces of the adaptor housing 2 inside and outside the first outlet 13 to seal the first outlet 13.

When the first discharge port 13 is sealed, the second discharge port 14 communicates with the spool housing chamber 19 through the inner ring of the annular seal 901. In order to seal the second outlet 14, a small sealing ring 9013 needs to be arranged on the lower end face of the annular seal 901, and the radius of the small sealing ring 9013 needs to be larger than the radius of the inner ring of the annular seal 901. The small sealing ring 9013 may come into contact with the top surface of the second float 7 and achieve sealing of the second discharge port 14 when the second float 7 ascends.

The second embodiment: this embodiment is a modification of the first embodiment described above, and the seal 901 is also an annular seal 901. The arrangement mode of the large sealing ring 9011 and the small sealing ring 9013 is unchanged, and the middle sealing ring 9012 is removed. Specifically, on the wall surface of the inner cavity of the adaptor housing 2 between the first discharge port 13 and the second discharge port 14, a middle extension ring 202 is provided, and the lower end of the middle extension ring 202 is used for contacting with the upper end surface of the annular seal 901. When the annular sealing member 901 moves to the closed position, the large sealing ring 9011 is matched to seal the first discharge port 13, and meanwhile, the inner ring of the annular sealing member 901 can be matched to communicate the second discharge port 14 with the valve core accommodating cavity 19. The sealing manner of the small sealing ring 9013 is the same as that of the first embodiment, and is not described again.

The third embodiment is as follows: this embodiment is also a modification of the first embodiment described above, and the seal 901 is also an annular seal 901. The arrangement mode of the middle sealing ring 9012 and the small sealing ring 9013 is unchanged, and the large sealing ring 9011 is removed. Specifically, a large extension ring is disposed on the wall surface of the top surface of the inner cavity of the adaptor housing 2 outside the first discharge port 13, and the lower end of the large extension ring is used for contacting with the upper end surface of the annular sealing member 901. To effect sealing of the first outlet port 13 by the cooperating sealing ring 9012 when the annular seal 901 is moved to the closed position. The sealing manner of the middle sealing ring 9012 and the small sealing ring 9013 to the second discharge port 14 is the same as that of the first embodiment, and is not described again.

The fourth embodiment: this embodiment is also a modification of the first embodiment described above, and the seal 901 is also an annular seal 901. The small seal ring 9013 is arranged in a constant manner, and the large seal ring 9011 and the middle seal ring 9012 are removed. Specifically, a large extension ring is disposed on the wall surface of the top surface of the inner cavity of the adaptor housing 2 outside the first discharge port 13, and the lower end of the large extension ring is used for contacting with the upper end surface of the annular sealing member 901. On the wall surface of the interior of the adaptor housing 2 between the first discharge opening 13 and the second discharge opening 14, a middle extension ring 202 is provided, and the lower end of the middle extension ring 202 is also used to contact the upper end surface of the annular seal 901. So that the large and medium extension rings 202 cooperate with the annular seal 901 to effect a seal against the first outlet port 13 when the annular seal 901 is moved to the closed position. The sealing manner of the small sealing ring 9013 to the second discharge port 14 is the same as that of the first embodiment, and is not described again.

The fifth embodiment: this embodiment is a modification of the first embodiment described above, and the seal 901 is also an annular seal 901. The large, middle and

small seal rings

9011, 9012 and 9013 are all removed. Specifically, a large extension ring is disposed on the wall surface of the top surface of the inner cavity of the adaptor housing 2 outside the first discharge port 13, and the lower end of the large extension ring is used for contacting with the upper end surface of the annular sealing member 901. On the wall surface of the inner cavity top surface of the adaptor shell 2 between the first discharge port 13 and the second discharge port 14, a small extension ring 203 is arranged, the upper end diameter of the small extension ring 203 is larger than the inner ring diameter of the annular seal 901, the lower end diameter is smaller than the inner ring diameter of the annular seal 901, i.e. the outer side wall of the small extension ring 203 is used for contacting with the inner ring of the annular seal 901. So that when the annular seal 901 is moved to the closed position, the engagement of the annular seal 901 with the outer side wall of the small extension ring 203 and the large extension ring effect a seal against the first outlet port 13. The lower end of the small extension ring 203 cooperates with the upper surface of the small float to effect sealing of the second discharge port 14.

Of course, in other embodiments, the sealing assembly 9 may also be disposed on the first float 5 and the second float 7, and directly cooperate with the first discharge port 13 and the second discharge port 14 to seal, and the specific implementation manner is many and is not limited herein.

EXAMPLE III

Referring to fig. 2, this embodiment is a further improvement on the structure of the third inflow channel 22 in the first embodiment, and the specific details are as follows:

in the present embodiment, the inner side wall of the outer shell 4 and the outer side wall of the adaptor shell 2 are both circular, but the arrangement of the outer shell 4 and the adaptor shell 2 may be various, and is not limited specifically herein.

The overall idea is that a blocking member 21 is provided on the third inflow passage 22 to limit the flow area of the third inflow passage 22, and when the inflow pressure of the oil is constant, the oil flowing into the spool housing chamber 19 is reduced.

Specifically, the blocking member 21 may be an annular blocking member 21 disposed on the inner side wall of the outer casing 4, and the inner circle diameter of the annular blocking member 21 is larger than the diameter of the outer side wall of the transition casing 2, so as to form a gap between the annular blocking member 21 and the transition casing 2, and the cross-sectional area of the gap is the flow area of the third inflow passage 22. The diameter of the inner ring of the annular blocking member 21 may be changed according to the size of the required flow area, or the flow area may also be changed by directly forming holes on the annular blocking member 21, and the specific implementation manner is various and is not limited herein.

In another embodiment, the blocking member 21 may be an annular blocking member 21 disposed on the outer side wall of the transition casing 2, the outer diameter of the annular blocking member 21 is smaller than the diameter of the inner side wall of the outer casing 4, so as to form a gap between the annular blocking member 21 and the outer casing 4, and the cross-sectional area of the gap is the flow area of the third inflow passage 22. The outer diameter of the annular blocking member 21 may be changed according to the size of the required flow area, or the flow area may also be changed by directly forming holes on the annular blocking member 21, and the specific implementation manner is many and is not limited herein.

In another embodiment, the blocking member 21 may be an annular blocking member 21 having an outer ring and an inner ring respectively connected to the inner side wall of the outer shell 4 and the outer side wall of the adaptor shell 2, and the annular blocking member 21 is directly perforated, and the specific implementation manners, such as the flow area, the shape of the holes, and the arrangement manner, may be changed by the area and the number of the perforations, and are not limited in this embodiment.

In other embodiments, there may be several blocking members 21 disposed on the inner sidewall of the outer casing 4 or the outer sidewall of the adaptor casing 2 or connected to both the outer casing 4 and the adaptor casing 2, the shapes of the blocking members 21 may also be various, and the cross-sectional area of the gap formed between the several blocking members 21 and the adaptor casing 2 is the flow area of the third inflow channel 22.

In this embodiment, the blocking member 21 is disposed on the third inflow channel 22, so that when a large amount of fluid enters the spool accommodating chamber 19 through the third inflow channel 22, a relative isolation effect is formed between the external fluid and the internal spool, a certain blocking effect is generated on the fluid, and premature closing of the spool assembly due to a large amount of fluid inrush is avoided. In addition, under the bad operating mode such as the range of rocking is big, fluid can get into case holding chamber 19 through third inflow channel 22 because of the reason of rocking, and at this moment the design of barrier 21 can make fluid and case holding chamber 19 keep apart relatively equally, and less entering case holding chamber 19 of fluid reduces the influence of operating mode such as rocking to case subassembly, and simultaneously, the fluid that gets into in case holding chamber 19 is less, and in the dynamic process, the probability that fluid leaked will greatly reduced from the valve internal.

Example four

Referring to fig. 2, this embodiment is a further improvement of the bottom structure of the outer surface of the housing 4 in the first embodiment, which is as follows:

the main purpose of the development of the embodiment is to slow down the influence of the oil on the second float 7 and to avoid the second float 7 from being lifted prematurely due to the impact of the oil, so that the second discharge opening 14 is closed prematurely.

Therefore, the present embodiment alleviates the problem of the second float 7 rising due to the oil impact by lifting the lowest height of the second float 7.

In particular, a raised structure 20 may be provided on the bottom surface of the internal cavity of the housing 4, the raised structure 20 matching the position of the second float 7, the height being determined according to the specific specifications for the second float 7. The hollow member 401 is mounted on the top surface of the elevation structure 20 such that the lowest level of the second float 7 is the top surface of the elevation structure 20 and oil needs to rise to the top surface of the elevation structure 20 to affect the second float 7.

The raised structure 20 may be a spacer, which may be a hollow structure, to further reduce the overall weight of the valve. The raised structure 20 may also be a depression provided on the bottom surface of the outer surface of the housing 4 and forming a depression cavity, i.e. a protrusion on the bottom surface of the cavity when viewed from the cavity. And the hollow member 401 is mounted on the projection, so that the lowest position of the second float 7 can be moved upward as well. Raise structure 20 for directly setting up in the inner chamber, the setting in sunken chamber can cooperate the bottom surface of shell 4 to form an air chamber for when taking place fluid and assaulting, produce the effect of protection to second valve core subassembly.

The refueling limit valve and the rollover valve both have a theoretical closing height, namely, after the liquid level in the fuel tank rises to a certain height, the float in the refueling limit valve and the rollover valve can rise until the exhaust channel is closed, but after the liquid level rises to close the exhaust channel of the refueling limit valve, the rollover valve is required to be ensured not to be closed.

In the embodiment, the concave groove is formed in the bottom of the outer surface of the shell 4 or the cushion block is directly arranged in the inner cavity, the mode is a lifting design, the lowest sliding position of the second floater 7 is lifted, so that the second floater 7 can be lifted by enough buoyancy after the fluid entering the valve core accommodating cavity 19 reaches a certain height, and the situation that the second floater 7 is lifted and the second discharge port 14 is closed too early is avoided. At the same time, this elevated design also ensures that the tilting valve function is still open after the filling metering valve function is closed, i.e. the second outlet 14 is not closed after the first outlet 13 is closed. In addition, because the second float 7 is at a higher position, when the valve is in working conditions such as shaking, the fluid which can enter the valve core accommodating cavity 19 and impact the second float 7 is relatively less, and the leakage problem under dynamic conditions is improved to a certain extent. In addition, the lifting design sets up for open-ended recess, can form the air chamber in groove, protects the second valve core subassembly with the bottom surface cooperation of shell 4, reduces the impact of fluid.

EXAMPLE five

Referring to fig. 1, this embodiment is a further description of a specific structure of the voltage-maintaining portion in the first embodiment, and the specific structure is as follows:

the design idea of the pressure-maintaining part is to design a component at the second discharge port 14, which needs a certain pressure to open, so that when the pressure in the fuel tank reaches a certain value, the gas will be discharged from the second discharge port 14. Therefore, the pressure maintaining part is specifically provided as a pressure maintaining shell 12 and a pressure maintaining cover 11, the pressure maintaining shell 12 serves as a connecting piece for connecting the second outlet 14, an accommodating space is reserved inside, the pressure maintaining cover 11 is arranged in the accommodating space and used for covering an inflow port communicated with the second outlet 14 in the accommodating space, the closing of the inflow port is maintained through the self gravity, when the pressure in the valve core accommodating cavity 19 is greater than or can counteract the weight of the pressure maintaining cover 11, the pressure maintaining cover 11 is jacked up, and the gas can be exhausted.

Further, the pressure maintaining cover 11 may be made of a material having a relatively large weight, or may be formed by combining a light material with an elastic member. When the elastic member is adopted, two ends of the elastic member are respectively connected with the upper end of the pressure maintaining cover 11 and the top surface of the accommodating space, and the pressing force required for closing the inflow port is formed by the elastic force of the elastic member and the gravity of the pressure maintaining cover 11.

Referring to fig. 17, when the height of the fluid discharge chamber formed by the valve body and the coupling flange 1 is low, the thickness of the pressure holding case 12 can be designed to be thin, and the width of the pressure holding case 12 becomes large. Because when playing to refuel the function of limit valve, the displacement of the department of first blowout port 13 can be very big, need the flow area that is big enough, in order to avoid the pressure shell 12 too wide to lead to taking place the interference to first blowout port 13, make the flow area of first blowout port 13 reduce, can set up an extension pipe in the bottom of pressure shell 12, the both ends of this extension pipe communicate with inflow entrance and second discharge port 14 respectively, with the high lifting of the bottom surface of pressure shell 12, make it can not take place the interference with the top surface of adapter shell 2, thereby can not exert an influence to first blowout port 13.

Referring to fig. 18, when the height of the fluid discharge chamber is high, the width of the pressure-maintaining shell 12 may be designed to be smaller than the minimum diameter of the first discharge port 13, so that the inflow port may be directly connected to the second discharge port 14 without providing an extension pipe. The volume of the accommodating space is smaller, and the volume of the pressure maintaining cover 11 can be smaller, so that the mode that the pressure maintaining cover 11 is matched with the elastic piece is more suitable for the design.

EXAMPLE six

Referring to fig. 1 and fig. 15, the present embodiment is further illustrated for the specific structure of the movable element 10 in the first embodiment, which is as follows:

the movable piece 10 is assembled with the second float 7, and the second float 7 can do a certain vertical axial movement in the valve core accommodating cavity 19. The assembly mode of the movable part 10 and the second floater 7 can be a hinge type rotating shaft structure, so that the movable part 10 can rotate along the axis of one side; it may also be of "ramp" construction, with the top surface of the moveable member 10 at an angle to the horizontal after it has been mounted on the second float 7.

Further, the movable member 10 is rotatably connected to the top surface of the second float through a rotating shaft, forms a certain angle with the axis under the action of the second float 7 and its own weight, forms an opening with a communication passage formed by the second discharge port and the seal assembly from one side to perform breathing and exhaust, and forms a vent passage under high pressure, thereby releasing the pressure in the fuel tank.

The movable member 10 is used to enable a certain pressure to build up in the fuel tank under some conditions when the entire valve core, i.e. the first valve core assembly and the second valve core assembly, is in a closed position, so that the first outlet 13 and the second outlet 14 are both closed, and at least one of the two valve cores needs to be opened in time to relieve the pressure in the fuel tank. Since P is F/S, when F is constant, S is larger, P is smaller, that is, when there is higher pressure in the fuel tank, the cross-sectional area S of the first outlet 13 is usually larger, so that the first outlet is opened at lower pressure, and it is necessary to open the second outlet 14 in time to relieve the pressure in the fuel tank. The combination of the movable element 10 and the second float 7 is to make the movable element more easily opened after being sealed with the small hole, so as to realize the pressure relief in the fuel tank. The combined structure of the movable element 10 and the second float 7 can be varied with the aim of achieving an easier reopening function of the orifice. Alternatively, the movable element 10 can be eliminated, and the function of easy reopening can be achieved by making some structure on the second float 7.

EXAMPLE seven

The multifunctional combination valve of the embodiment comprises the valve in any one of the embodiments. The function that this embodiment can realize refueling limit valve and the function of upset valve through the cooperation between two case subassemblies, and do not influence each other, the valve that the performance of two case was adjusted respectively to the accessible simultaneously obtains different technical demands has solved the problem that two case influence each other in the current valve.

The operation of the multifunctional combination valve under various working conditions is described as follows:

1. referring to fig. 9, the fuel tank is vented through a valve to allow for refueling and metering valve venting. This condition is generally in the condition of underfilling of the tank interior, or it can be understood that the fuel inside the tank does not flood the first float 5 and the second float 7 too much, both of which are in the condition of falling, the sealing assembly 9 does not form a seal with the first outlet 13 and with the second outlet 14, and the gas inside the tank can be discharged through the first outlet 13, the valve functioning as a filling limit valve

2. Referring to fig. 10-12, the valve implements the fueling limit function of the fueling limit valve. The function of limiting the amount of fuel is the function of jumping the gun when fuel is filled. The common realization of fuel tank refueling gun skip is divided into two cases. However, in general, after the large air flow passage in the fueling limit valve is closed or narrowed, the pressure in the fuel tank rises sharply and the liquid level on the fueling pipe side also rises sharply in the case of continuous fueling, resulting in gun jump during fueling.

2.1 when the first connection port 15 opened on the side of the base is relatively close to the upper side, in the refueling process, when the liquid level of the fuel rises to the position of the first connection port 15, the fuel can instantly enter the valve core accommodating cavity 19 through the third inflow channel 22, at this time, the gravity of the whole formed by the first floater 5 and the sealing component 9 connected in the valve core accommodating cavity 19 in a sliding manner can be smaller than the buoyancy of the fuel and the elastic force of the first elastic piece 6, so that the first floater 5 can drive the sealing component 9 to move upwards, until the sealing component 9 touches the top surface of the inner cavity of the transfer shell 2, the sealing component 9 can seal the first exhaust port 13, and thus the large exhaust channel in the valve can be closed, so that the pressure in the fuel tank can rise rapidly, and a refueling jump gun can be formed.

2.2 another case where the valve has the function of a refuelling metering valve. When the first connecting port 15 arranged on the base is lower, in the refueling process, after the liquid level is submerged to the lower edge of the first connecting port 15, the ventilation window is smaller and smaller along with the continuous rising of the liquid level of the fuel oil, so that the cross-sectional area of the ventilation flow channel is smaller and smaller, the pressure in the fuel tank is continuously raised along with the reduction of the ventilation flow channel until the pressure in the fuel tank is raised to a certain degree, and then the gun jump during refueling is formed.

3. Referring to fig. 13 and 14, the first outlet port 13 of the valve is closed and venting of pressure from the tank is accomplished by a rollover valve function. The situation is that the fuel tank is full of fuel or some vehicles are at a certain inclination angle, the first float 5 and the sealing assembly 9 in the valve core are caused to rise to close the first discharge port 13, but the difference of the whole is larger after the gravity of the second float 7 plus the movable piece 10 minus the elastic force of the second elastic piece 8, and a larger downward gravity is also generated, so that the whole formed by the second float 7 and the movable piece 10 is not raised, at the moment, the communication channel of the sealing assembly 9 for communicating the second discharge port 14 is still open, but because the pressure retaining part is arranged above the second discharge port 14 corresponding to the adapter shell 2, the whole valve is still in a relatively sealed state, at the moment, the fuel in the fuel tank can be volatilized continuously or influenced by the rise of temperature, the pressure in the fuel tank can be continuously raised, and the function of the roll-over valve needs to be exerted, the pressure rising inside the fuel tank is discharged in time. When the pressure in the fuel tank rises enough to blow the pressure maintaining cover 11, the pressure in the fuel tank is reduced, and air flow enters the valve core accommodating cavity 19 through the second inflow channel on the side surface of the shell 4, then flows to the second discharge port 14 on the transfer shell 2 through the communication channel on the sealing component 9, then flows through the exhaust channel designed in the pressure maintaining shell 12, and is discharged out of the fluid discharge cavity.

4. Referring to fig. 15, when the vehicle is driven and there may be a strong sloshing or a certain inclination, the oil inside the fuel tank will also be strongly sloshing, and it is required that the first outlet 13 and the second outlet 14 inside the valve are sealed in time to prevent the oil inside the fuel tank from leaking out through the outlet inside the valve. The first float 5 and the sealing assembly 9 will rise in time with the shaking to close the first discharge opening 13 on the transfer housing 2, whereupon the second and movable assemblies will also rise in time to close the communication channel corresponding to the sealing assembly 9. Therefore, the whole valve core can form a sealed state to prevent dynamic leakage of fuel.

The fuel tank rocks the in-process, the case of valve need in time to be closed and prevents dynamic fuel leakage, this case that just needs the case of valve is more nimble, rock and make and in time to close, so this valve of two case designs that mutually independent, the flexibility of case just is easily adjusted more, because inside two case one outside, one is surveyed in, two case do not have direct relevance, so the ratio of float and spring just can separately be adjusted to two case, adjust the flexibility of every case alone, in order to realize preventing the purpose that the fuel leaked.

5. Referring to fig. 16, in the fuel sloshing process in the above 4, the two valve cores can be closed in time to prevent the fuel leakage in the stop state. Meanwhile, after the valve core is closed in time, the valve core needs to be closed in time and opened in time in the fuel shaking process, and because the inside of the fuel tank is in a completely closed state after the valve core is closed in time, the internal pressure rises along with the valve core, and at the moment, the function of the turning valve of the valve is needed to be opened in time to unload the pressure in the fuel tank.

From P ═ F/S, it can be seen that when F is constant, the larger the contact area S, the smaller P. Because the area of the first outlet 13 corresponding to the first floater 5 and the sealing component 9 in the valve core is larger, when a certain pressure exists in the fuel tank, the first valve core component is difficult to open in time for pressure relief, and at this time, the small hole corresponding to the second floater 7 in the fuel tank and the movable component is required to open in time for pressure relief.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, the changes are still within the scope of the present invention if they fall within the scope of the claims and their equivalents.

Claims

1. A valve is characterized by comprising a valve body, a valve core part and a pressure maintaining part;

the first valve core assembly and the second valve core assembly are respectively connected to the valve core accommodating cavity in a vertical sliding mode, do not interfere with each other in movement tracks, and are respectively used for opening and closing the first discharge port and the second discharge port;

2. The valve according to claim 1, wherein the valve core portion further comprises a sealing assembly, the sealing assembly is arranged at the top end of the valve core accommodating cavity or vertically slides in the valve core accommodating cavity, and is used for matching with the first valve core assembly to open and close the first discharge port; and the sealing assembly is also provided with a communication channel for communicating the second discharge port with the second inflow channel and is used for matching with the second valve spool assembly to open and close the second discharge port.

3. The valve of claim 2, wherein the seal assembly is disposed on a top surface of the cartridge receiving cavity, the seal assembly being a seal; the sealing elements are arranged at the first discharge port and the second discharge port;

4. The valve of claim 2, wherein the seal assembly is slidably connected to the cartridge receiving cavity, the seal assembly including a slider and a seal;

5. The valve of claim 1, further comprising a connecting flange; the connecting flange is connected with the valve body and matched with the top surface of the valve body to form a fluid discharge chamber used for guiding the fluid discharged from the first discharge port and the pressure maintaining part.

6. The valve of claim 2, wherein the valve body comprises an upwardly open outer housing and a downwardly open adaptor housing; the shell is sleeved at the lower end of the switching shell and is fixedly connected with the switching shell;

7. The valve of claim 6, wherein a plurality of vertically arranged first guide rails are arranged on an inner wall surface of the adapter housing, and the first valve core assembly is slidably connected to the first guide rails;

8. The valve of claim 7, wherein the first spool assembly is nested within the hollow member and the second spool assembly.

9. The valve of claim 1, wherein the first spool assembly includes a first float, a first spring; the first floater is connected with the valve core accommodating cavity in a sliding mode, and two ends of the first elastic piece are connected with the first floater and the bottom surface of the valve core accommodating cavity respectively.

10. The valve of claim 2, wherein the second spool assembly comprises a second float, a second resilient member, a movable member; the second floater is connected with the valve core accommodating cavity in a sliding manner, and two ends of the second elastic piece are respectively connected with the second floater and the bottom surface of the valve core accommodating cavity; the movable piece is movably connected to the top surface of the second floater and is used for being matched with the sealing assembly to open and close the second discharge port.

11. The valve of claim 1, wherein the pressure retaining portion comprises a pressure retaining shell and a pressure retaining cap; an accommodating space is arranged in the pressure maintaining shell, and an inflow hole and a discharge hole which are communicated with the accommodating space are also arranged on the pressure maintaining shell; the pressure maintaining shell is arranged on the top surface of the valve body, and the inflow hole is communicated with the second discharge port; the pressure-retaining cover is connected to the accommodating space in a sliding manner and used for opening and closing the inflow hole.

12. A valve according to claim 6, wherein a barrier is provided on the third inlet passage for limiting the flow area of the inlet passage.

13. The valve of claim 7, wherein the bottom surface of the housing is provided with a concave recess corresponding to the second spool assembly for elevating a minimum sliding height of the second spool assembly.

14. A multifunctional combination valve, characterized in that it comprises a valve according to any one of claims 1 to 13.