A valve and a multi-functional combined valve

Abstract

The present invention discloses a valve and a multi-functional combined valve, which can simultaneously achieve the functions of a refueling limit valve and a tipping valve in a fuel tank. By providing a valve core accommodating cavity in the valve body, and providing a first inflow channel, a second inflow channel, a first discharge port and a second discharge port communicating therewith. Two independent vertically sliding first valve core assemblies and second valve core assemblies are provided in the valve core accommodating cavity for opening and closing the first discharge port and the second discharge port. The pressure maintaining part is connected to the second discharge port and contains a certain opening pressure; after the first valve core assembly closes the first discharge port, the pressure maintaining part will open the second discharge port when a certain pressure value is reached in the valve core accommodating cavity, and the fluid will flow out through the second discharge port. The two valve core assemblies can achieve different functions and do not affect each other, and the combined valve with different technical requirements can be obtained by separately adjusting the performance of the two valve cores, solving the problem that the two valve cores in the existing combined valve affect each other.

Description

Technical Field

[0001] The present invention belongs to the technical field of valves, and particularly relates to a valve and a multi-functional combined valve. Background Art

[0002] Generally, the following two requirements are imposed on fuel tanks in the current market: 1. Refueling limit (overfilling is prohibited); 2. The fuel tank can exhaust normally under some specific circumstances: when there is positive pressure in the fuel tank, it can relieve pressure in time, or when there is negative pressure in the fuel tank, it can supply air into the fuel tank in time. Generally, in order to meet the above requirements of the fuel tank, a fuel tank needs to be equipped with a refueling limit valve and at least one roll-over valve. Gradually, some new designs have emerged in the market. A fuel tank valve can meet the above two functional requirements at the same time, integrating the functions of the two valves into one product. In this way, the number of valves required to be configured for the fuel tank can be reduced, and it is easier to layout on the fuel tank. We generally call it a combined valve, that is, combining the refueling limit valve and the roll-over valve together, so that one product has the functions of both.

[0003] With the promulgation of the "National VI" regulations, the requirements for the evaporation emissions of the entire fuel system have become increasingly stringent, and the requirements for the dynamic leakage of the fuel tank (generally including horizontal shaking tests, angular roll-over shaking tests, and six-axis shaking tests, etc.) have also increased accordingly. This poses a certain test for the design of valves. Whether it is a refueling limit valve, a roll-over valve, or a combined valve, since these types of valves are fixedly installed on the fuel tank, the valve core communicates with the inside of the fuel tank, and the pipe orifice of the valve is generally connected to the carbon canister through a pipeline. When the vehicle fluctuates during driving, the fuel in the fuel tank will also surge. If the valve core inside the valve cannot seal the exhaust passage in time at this time, there is a certain probability that the fuel will turn out of the valve exhaust passage and flow out through the pipe orifice, resulting in a leakage phenomenon.

[0004] Currently, there are two main types of combined valves in the market. One is that the overall combined valve is relatively large. One side is the valve core of the refueling limit valve, and the other side is the valve core of the roll-over valve, and the two do not interfere with each other. However, since the two valve cores are separated, the combined valve is much larger than a common refueling limit valve, so the cost will be relatively high, and it is also relatively difficult to layout on the fuel tank. The other type that is more common is that the size of the combined valve is similar to that of a common refueling limit valve. It stacks the valve core of the refueling limit valve and the valve core of the roll-over valve together, with the small float stacked on the large float. The small float correspondingly realizes the function of the refueling limit valve, and the large float correspondingly realizes the function of the roll-over valve. However, in this design, since the two valve cores are stacked together, the functions of the corresponding two valve cores will also affect each other. If one valve core needs to be adjusted, it may affect the performance of the other valve core. In this way, there will be great limitations in adjusting the performance of the entire valve core. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a valve and a multi-functional combined valve to solve the problem that the two valve cores in the existing combined valve affect each other.

[0006] To solve the above problems, the technical solution of the present invention is as follows:

[0007] A valve of the present invention includes a valve body, a valve core part, and a pressure-holding part;

[0008] A valve core accommodating cavity is provided in the valve body; a first inflow channel and a second inflow channel communicating the valve core accommodating cavity with the external space of the valve body are provided on the valve body, and the inlet of the second inflow channel is higher than the inlet of the first inflow channel; a first discharge outlet and a second discharge outlet communicating with the valve core accommodating cavity are provided at the upper end of the valve body;

[0009] The valve core part includes a first valve core assembly and a second valve core assembly;

[0010] Among them, the first valve core assembly and the second valve core assembly are respectively vertically slidably connected to the valve core accommodating cavity, and are respectively used to open and close the first discharge outlet and the second discharge outlet;

[0011] The pressure-holding part is provided on the top surface of the valve body, and the input end is communicated with the second discharge outlet, and is used to limit the pressure required for the fluid to be discharged from the second discharge outlet;

[0012] After the first valve core assembly is closed to close the first discharge outlet, when the fluid in the valve core accommodating cavity reaches a certain pressure value, the pressure-holding part will open the second discharge outlet, and the fluid will be discharged from the second discharge outlet to realize the function of a tilting valve. The two valve core assemblies realize different functions and do not affect each other. At the same time, different combined valves with different technical requirements can be obtained by respectively adjusting the two valve core assemblies.

[0013] For the valve of the present invention, the valve core part further includes a sealing component, and the sealing component is provided at the top end of the valve core accommodating cavity or vertically slides in the valve core accommodating cavity, and is used to cooperate with the first valve core assembly to open and close the first discharge outlet; a communication channel for communicating the second discharge outlet and the second inflow channel is further provided on the sealing component, and is used to cooperate with the second valve core assembly to open and close the second discharge outlet.

[0014] For the valve of the present invention, the sealing component is provided on the top surface of the valve core accommodating cavity, and the sealing component is a sealing element; the sealing element is provided at the first discharge outlet and the second discharge outlet;

[0015] The seal forms a communication channel for communicating the first row of outlets with the valve core accommodating cavity, and is used to cooperate with the first valve core assembly to open and close the first row of outlets; the seal forms a communication channel for communicating the second row of outlets with the valve core accommodating cavity, and is used to cooperate with the second valve core assembly to open and close the second row of outlets.

[0016] For the valve of the present invention, the sealing assembly is slidably connected to the valve core accommodating cavity, and the sealing assembly includes a sliding member and a seal;

[0017] The sliding member is slidably connected to the valve core accommodating cavity, and the seal is installed on the sliding member; the seal is provided with a sealing block for sealing the first row of outlets, and is also provided with a communication channel for communicating the second row of outlets;

[0018] The sliding member is driven by the first valve core assembly to slide up and down, and cooperates with the sealing block to open and close the first row of outlets; the communication channel for communicating the second row of outlets is used to cooperate with the second valve core assembly to open and close the second row of outlets.

[0019] For the valve of the present invention, it further includes a connecting flange; the connecting flange is connected to the valve body and cooperates with the top surface of the valve body to form a fluid discharge chamber for guiding the fluid discharged from the first row of outlets and the pressure maintaining part.

[0020] For the valve of the present invention, the valve body includes an outer shell with an upward opening and an adapter shell with a downward opening; the outer shell is sleeved on the lower end of the adapter shell and is fixedly connected to the adapter shell;

[0021] The inner wall surface of the adapter shell and the bottom surface of the outer shell cooperate to form the valve core accommodating cavity; at least one first connection port is opened on the shell of the outer shell, and the first connection port, the outer wall surface of the adapter shell and the inner wall surface of the outer shell cooperate to form a third inflow channel for communicating the valve core accommodating cavity;

[0022] At least one second connection port for communicating the valve core accommodating cavity is provided on the shell of the adapter shell, and the first connection port and the second connection port cooperate to form the first inflow channel;

[0023] At least one third connection port is opened on the outer shell, and at least one fourth connection port for communicating the valve core accommodating cavity is provided on the shell of the adapter shell. The third connection port, the fourth connection port and the communication channel of the sealing assembly cooperate to form the second inflow channel.

[0024] For the valve of the present invention, a plurality of vertically arranged first guiding slide rails are provided on the inner wall surface of the adapter shell, and the first valve core assembly is slidably connected to the first guiding slide rails;

[0025] A hollow member is provided on the bottom surface of the inner cavity of the outer shell. The hollow member and the bottom surface of the inner cavity cooperate to form a vertical guide groove, and a plurality of vertically arranged second guide slide rails are provided on the inner wall surface of the hollow member; the second valve core assembly is slidably connected to the second guide slide rails.

[0026] For the valve of the present invention, the first valve core assembly includes a first float and a first elastic member; the first float is slidably connected to the valve core accommodation cavity, and two ends of the first elastic member are respectively connected to the first float and the bottom surface of the valve core accommodation cavity.

[0027] For the valve of the present invention, the second valve core assembly includes a second float, a second elastic member, and a movable member; the second float is slidably connected to the valve core accommodation cavity, and two ends of the second elastic member are respectively connected to the second float and the bottom surface of the valve core accommodation cavity; the movable member is movably connected to the top surface of the second float and is used to cooperate with the sealing assembly to open and close the second discharge port.

[0028] For the valve of the present invention, the pressure maintaining part includes a pressure maintaining shell and a pressure maintaining cover; a accommodation space is provided inside the pressure maintaining shell, and an inflow hole and a discharge hole communicating with the accommodation space are further provided on the pressure maintaining shell; the pressure maintaining shell is provided on the top surface of the valve body, and the inflow hole is communicated with the second discharge port; the pressure maintaining cover is slidably connected to the accommodation space and is used to open and close the inflow hole.

[0029] For the valve of the present invention, a blocking member is provided on the third inflow channel to limit the flow area of the inflow channel.

[0030] For the valve of the present invention, a concave groove is provided on the bottom surface of the outer shell, and the groove corresponds to the second valve core assembly and is used to raise the lowest sliding height of the second valve core assembly.

[0031] A multifunctional combined valve of the present invention includes the valve described in any one of the above.

[0032] Due to the adoption of the above technical solutions, the present invention has the following advantages and positive effects compared with the prior art:

[0033] 1. In an embodiment of the present invention, a spool accommodating cavity is provided inside the valve body, and a first inflow channel, a second inflow channel, a first discharge port and a second discharge port communicating therewith are provided. The two inflow channels are used to guide external fluid into the spool accommodating cavity, and the two discharge ports are used to discharge the fluid in the spool accommodating cavity. Inside the spool accommodating cavity, two independently vertically sliding first spool assemblies and second spool assemblies are provided, which are respectively used to open and close the first discharge port and the second discharge port to achieve the function of a fuel filling limiting valve. The pressure maintaining part is connected to the second discharge port and contains a certain opening pressure, which is used to limit the fluid discharged through the second discharge port. After the first spool assembly closes the first discharge port, when the fluid in the spool accommodating cavity reaches a certain pressure value, the pressure maintaining part will open the second discharge port, and the fluid will flow out through the second discharge port to achieve the function of a flip valve. The two spool assemblies can achieve different functions and do not affect each other. At the same time, different combinations of valves with different technical requirements can be obtained by separately adjusting the performance of the two spools, solving the problem that the two spools in the existing combined valve affect each other. At the same time, the two spool assemblies are designed in one spool accommodating cavity, reducing the volume of the valve and making it more conducive to the layout of the valve in the fuel tank.

[0034] 2. In an embodiment of the present invention, a sealing assembly is further provided inside the valve body, which is used to cooperate with the two spool assemblies respectively to open and close the two discharge ports to improve the sealing performance of the valve. The sealing assembly can be arranged to slide inside the spool accommodating cavity, or can be fixedly arranged at the two discharge ports. The arrangement method is flexible and changeable, and different layout methods can be adopted according to different technical requirements. At the same time, when the sealing effect of the valve is insufficient after a long time of use, only the sealing assembly needs to be replaced.

[0035] 3. In an embodiment of the present invention, a first guiding slide rail is provided on the inner wall surface of the adapter housing, and a hollow part is provided on the bottom surface of the inner cavity of the outer housing to cooperate to form a guiding groove, and a second guiding slide rail is provided on the inner wall surface of the hollow part. The first guiding slide rail and the second guiding slide rail are respectively slidably connected to the first spool assembly and the second spool assembly, which are used to limit the vertical movement of the two spool assemblies. The amount of movement of the spool assembly can be limited by designing the clearance of the sliding connection, and at the same time, the contact area between the spool assembly and the contacting parts during the movement can be reduced, reducing the friction between each other, making the spool assembly more flexible during the movement and easier to open and close the corresponding discharge port.

[0036] 4. In an embodiment of the present invention, a movable part is provided on the top of the second float. When the second float rises to the closed position, the movable part cooperates with the sealing assembly to close the second discharge port. The combination of the movable part and the second float can make the sealed second discharge port easier to open.

[0037] 5. In an embodiment of the present invention, the pressure-holding part includes a pressure-holding shell and a pressure-holding cover that slides therein. After the first row of outlets is closed, the pressure in the valve core accommodating cavity continuously increases, and the fluid can only be discharged from the second row of outlets. The pressure-holding part is arranged at the outlet of the second row of outlets to limit a certain pressure on the second row of outlets. When the pressure in the valve core accommodating cavity reaches the required pressure, the pressure-holding cover slides and opens in the pressure-holding shell, and the fluid in the valve core accommodating cavity can be discharged through the pressure-holding shell, thus realizing the function of the flip valve.

[0038] 6. In an embodiment of the present invention, a barrier is provided on the third inflow channel. When a large amount of fluid enters the valve core accommodating cavity through the third inflow channel, it can play a role in relatively isolating the external fluid from the internal valve core, producing a certain blocking effect on the fluid, and preventing the valve core assembly from closing prematurely due to a large influx of fluid. In addition, under harsh working conditions such as large shaking amplitude, the fluid will enter the valve core accommodating cavity through the third inflow channel due to shaking. At this time, the design of the barrier will also relatively isolate the fluid from the valve core accommodating cavity, and less fluid will enter the valve core accommodating cavity, reducing the impact of working conditions such as shaking on the valve core assembly. At the same time, less fluid enters the valve core accommodating cavity, and the probability of fluid leakage from the valve body during the dynamic process will be greatly reduced.

[0039] 7. In an embodiment of the present invention, a concave groove is provided at the bottom of the outer surface of the outer shell, which is a raised design that raises the lowest sliding position of the second float, so that the fluid entering the valve core accommodating cavity needs to reach a certain height before the second float can receive sufficient buoyancy and rise, avoiding the situation where the second float rises prematurely and closes the second row of outlets. At the same time, because the second float is at a higher position, when in working conditions such as shaking, relatively less fluid that can enter the valve core accommodating cavity and impact the second float, which also improves the leakage problem in the dynamic situation. In addition, the raised design is an open groove, which can form an air cavity at the groove, and cooperate with the bottom surface of the outer shell to protect the second valve core assembly and reduce the impact of oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a cross-sectional view of the valve of the present invention;

[0041] Figure 2 is another cross-sectional view of the valve of the present invention;

[0042] Figure 3 is a cross-sectional view of the first float and the second float of the valve of the present invention;

[0043] Figure 4 is a schematic diagram of the top surface of the adapter shell of the valve of the present invention;

[0044] Figure 5Schematic diagram of the first row of outlets and the second row of outlets of the valve of the present invention;

[0045] Figure 6 Schematic diagram of the seal of the valve of the present invention;

[0046] Figure 7 Another schematic diagram of the seal of the valve of the present invention;

[0047] Figure 8 Another schematic diagram of the seal of the valve of the present invention;

[0048] Figure 9 Schematic diagram of an operating mode of the valve of the present invention;

[0049] Figure 10 Another schematic diagram of an operating mode of the valve of the present invention;

[0050] Figure 11 Another schematic diagram of an operating mode of the valve of the present invention;

[0051] Figure 12 Another schematic diagram of an operating mode of the valve of the present invention;

[0052] Figure 13 Another schematic diagram of an operating mode of the valve of the present invention;

[0053] Figure 14 Another schematic diagram of an operating mode of the valve of the present invention;

[0054] Figure 15 Another schematic diagram of an operating mode of the valve of the present invention;

[0055] Figure 16 Another schematic diagram of an operating mode of the valve of the present invention;

[0056] Figure 17 Schematic diagram of an alternative solution for the pressure maintaining part of the valve of the present invention;

[0057] Figure 18 Another schematic diagram of an alternative solution for the pressure maintaining part of the valve of the present invention.

[0058] Explanation of the reference numerals: 1: connecting flange; 2: adapter shell; 201: first guide rail; 202: middle extension ring; 203: small extension ring; 3: sealing ring; 4: outer shell; 401: hollow part; 402: second guide rail; 5: first float; 501: first slide groove; 6: first elastic part; 7: second float; 701: second slide groove; 8: second elastic part; 9: sealing assembly; 901: sealing part; 9011: large sealing ring; 9012: middle sealing ring; 9013: small sealing ring; 902: sliding part; 10; movable part; 11: pressure retaining cover; 12: pressure retaining shell; 13: first discharge outlet; 14: second discharge outlet; 15: first connecting port; 16: second connecting port; 17: third connecting port; 18: fourth connecting port; 19: valve core accommodating chamber; 20: lifting structure; 21: barrier part; 22: third inflow channel. DETAILED DESCRIPTION

[0059] The valve and multifunctional combination valve proposed by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims.

[0060] Example 1

[0061] This embodiment is mainly a valve that can simultaneously realize the functions of a refueling limit valve and a rollover valve, and is applied to a fuel tank. The fluid in the fuel tank is oil and gas in the fuel tank.

[0062] See Figure 1 、 Figure 2 、 Figure 4 and Figure 5 The valve of this embodiment includes a valve body, a valve core portion, and a pressure maintaining portion.

[0063] The valve body is provided with a spool-accommodating chamber 19, and is provided with a first inflow channel and a second inflow channel, connecting the spool-accommodating chamber 19 with the exterior of the valve body. The inlet of the second inflow channel is higher than the inlet of the first inflow channel. The first inflow channel is primarily used for the inflow of oil and gas, while the second inflow channel is primarily used for the inflow of gas.

[0064] The upper end of the valve body is provided with a first outlet 13 and a second outlet 14, which communicate with the valve core accommodating chamber 19. These two outlets are used to discharge fluid from the valve core accommodating chamber 19. A pressure-maintaining portion is provided on the top surface of the valve body, with its input end communicating with the second outlet 14, to limit the pressure required to discharge the fluid from the second outlet 14.

[0065] The valve core portion includes a first valve core component and a second valve core component. The first valve core component and the second valve core component are respectively vertically slidably connected to the valve core accommodating cavity 19 and are used to open and close the first discharge port 13 and the second discharge port 14 respectively.

[0066] Among them, the switches of the two discharge ports cooperate to achieve the function of the fuel filling limit valve. That is, when the oil continuously surges into the valve core accommodating cavity 19, the gas entering the valve body is discharged through the two discharge ports, and at the same time, the first discharge port 13 and the second discharge port 14 are closed in sequence according to the inflow of the oil to avoid leakage caused by the discharge of the oil.

[0067] The cooperation between the pressure maintaining part and the first valve core assembly to close the first discharge port 13 enables the fluid in the valve core accommodating cavity 19 to flow out from the pressure maintaining part only when it reaches a certain pressure value, so as to realize the function of the tipping valve. The tipping valve is generally applied when the fuel tank is full or the vehicle has a certain inclination angle, that is, the first valve core assembly rises to close the first discharge port 13, but the second valve core assembly does not rise and the second discharge port 14 is in an open state. At this time, due to the setting of the pressure maintaining part, the valve is in a relatively sealed state. Due to the volatilization of the oil in the fuel tank or the influence of temperature rise, the pressure inside the fuel tank continues to rise, and the function of the tipping 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 to relieve the internal pressure.

[0068] In this embodiment, different functions can be achieved through the cooperation between the two valve core assemblies without mutual influence. At the same time, different combined valves with different technical requirements can be obtained by respectively adjusting the performance of the two valve cores, solving the problem that the two valve cores in the existing combined valve affect each other.

[0069] The specific structure of the valve in this embodiment will be further described below:

[0070] In this embodiment, the cross-sectional areas of the first discharge port 13 and the second discharge port 14 are not specifically limited. Based on the functions of the fuel filling limit valve and the tipping valve required by the fuel tank, the switch cooperation of the first discharge port 13 and the second discharge port 14 can achieve the function of the fuel filling limit valve, and the switch of the first discharge port 13 and the pressure maintaining part can achieve the function of the tipping valve. Therefore, the cross-sectional area of the first discharge port 13 should be larger than that of the second discharge port 14, but it can actually be determined according to the required technical requirements and is not specifically limited here.

[0071] In this embodiment, the valve core part may further include a sealing component 9. The sealing component 9 is arranged at the top of the valve core accommodating cavity 19 or slides vertically in the valve core accommodating cavity 19, and is used to cooperate with the first valve core component to open and close the first discharge port 13. A communication channel for connecting the second discharge port 14 and the second inflow channel is also provided on the sealing component 9, which is used to cooperate with the second valve core component to open and close the second discharge port 14. Specifically, it can be understood that the purpose of arranging the sealing component 9 is that when the first valve core component rises to the closed position, the sealing component 9 needs to close the first discharge port 13, and at the same time, it needs to have a certain cooperation with the second discharge port 14 to form a communication channel, so that when the second valve core component rises, it can cooperate with the sealing component 9 to close this communication channel. That is, the two valve core components respectively open and close the two discharge ports through the same sealing component 9.

[0072] Further arranging the sealing component 9 in the valve body, which is used to cooperate with the two valve core components respectively to open and close the two discharge ports, improves the sealing performance of the valve. The arrangement method of the sealing component 9 can be sliding in the valve core accommodating cavity 19, or fixedly arranged at the two discharge ports. The arrangement method is flexible and changeable, and different layout methods can be adopted according to different technical requirements. At the same time, after a long time of use, when the sealing effect of the valve is insufficient, only the sealing component 9 needs to be replaced.

[0073] In this embodiment, based on the foregoing components, the valve may further include a connecting flange 1, which is used to connect with an external pipeline to guide the gas discharged from the two discharge ports to the external pipeline for treatment. The connecting flange 1 can be sleeved on the valve body and cooperate with the top surface of the valve body to form a fluid discharge chamber. At this time, the first discharge port 13 and the pressure maintaining part are located in this fluid discharge chamber, which is used to guide the fluid discharged from the first discharge port 13 and the pressure maintaining part. The connection method between the connecting flange 1 and the valve body can be welding or other fixed connection methods. When necessary, a sealing ring 3 needs to be further used for sealing.

[0074] In this embodiment, the valve body may specifically include a housing 4 with an upward opening and an adapter housing 2 with a downward opening. The housing 4 is sleeved on the lower end of the adapter housing 2 and fixedly connected to the adapter housing 2. The inner wall surface of the adapter housing 2 and the inner cavity bottom surface of the housing 4 cooperate to form a valve core accommodating cavity 19.

[0075] Among them, at least one first connection port 15 is opened on the shell of the housing 4. The first connection port 15, the outer wall surface of the adapter housing 2 and the inner wall surface of the housing 4 cooperate to form a third inflow channel 22 that communicates with the valve core accommodating cavity 19. That is, after the oil fluid enters the interior of the housing 4 through the first connection port 15, under the action of gravity, it can flow to the inner cavity bottom surface of the housing 4 through the gap between the housing 4 and the adapter housing 2, thereby gradually filling the valve core accommodating cavity 19 and providing buoyancy for the first valve core component and the second valve core component to rise.

[0076] On the housing of the adapter housing 2, there is at least one second connection port 16 communicating with the valve core accommodation cavity 19. The first connection port 15 and the second connection port 16 cooperate to form a first inflow channel. The position of the second connection port 16 generally needs to be higher than that of the first connection port 15 to prevent the oil fluid flowing in through the first connection port 15 from entering the valve core accommodation cavity 19 through the second connection port 16. When the pressure in the fuel tank increases, the gas will enter the valve core accommodation cavity 19 through the first inflow channel and be discharged through the first discharge port 13 and the second discharge port 14 at the top to reduce the pressure in the fuel tank.

[0077] On the outer housing 4, there is at least one third connection port 17. On the housing of the adapter housing 2, there is at least one fourth connection port 18 communicating with the valve core accommodation cavity 19. The third connection port 17, the fourth connection port 18 and the communication channel of the sealing component 9 cooperate to form a second inflow channel. The heights of both the third connection port 17 and the fourth connection port 18 need to be higher than that of the first inflow channel. A preferred way is to be close to the tops of the outer housing 4 and the adapter housing 2, so that when the oil fluid level in the valve core accommodation cavity 19 is relatively high, the gas in the fuel tank can still flow into the valve core accommodation cavity 19 through the second inflow channel and form a pressure on the pressure maintaining part through the second discharge port 14 to open the pressure maintaining part and discharge the gas.

[0078] Furthermore, the first connection port  15, the second connection port 16, the third connection port 17 and the fourth connection port 18 can be through holes provided on the outer housing 4 or the adapter housing 2 respectively. Their specific sizes and shapes can be determined according to actual requirements and are not specifically limited here.

[0079] In this embodiment, the first valve core assembly corresponds to the first discharge port 13 and specifically includes a first float 5 and a first elastic member 6. The first float 5 is slidably connected to the valve core accommodation cavity 19. Two ends of the first elastic member 6 are respectively connected to the first float 5 and the bottom surface of the valve core accommodation cavity 19. A accommodation groove with an opening direction can be provided in the first float 5 so that the first elastic member 6 can extend into the first float 5 to be connected with the first float 5, thereby further reducing the volume of the first valve core assembly.

[0080] The second valve core assembly corresponds to the second discharge port 14 and specifically includes a second float 7, a second elastic member 8 and a movable member 10. The second float 7 is slidably connected to the valve core accommodation cavity 19. Two ends of the second elastic member 8 are respectively connected to the second float 7 and the bottom surface of the valve core accommodation cavity 19. The movable member 10 is movably connected to the top surface of the second float 7 and is used to cooperate with the sealing component 9 to open and close the second discharge port 14. At the same time, the combination of the movable member 10 and the second float 7 can make the sealed second discharge port 14 easier to open. Similarly, an accommodation groove with a downward opening can also be provided in the second float 7 for connecting with the second elastic member 8 to reduce the volume of the second valve core assembly.

[0081] Among them, the first elastic member 6 and the second elastic member 8 can both be springs, and the elastic force can be determined according to the gravity of the float and the lifting force when the float rises. In other embodiments, the two elastic members can also be elastic elements such as elastic rubber, and no specific limitation is made here.

[0082] Preferably, the first float 5 can be an annular float, and 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. After being slidably connected to the valve core accommodation groove, the first float 5 is in a state of sleeving the second float 7, which realizes the full utilization of the internal space of the valve and further reduces the volume of the valve. At this time, the second discharge port 14 can be a plurality of discharge holes provided on the inner cavity top surface of the adapter housing 2, and the first discharge port 13 can be a plurality of discharge holes surrounding the second discharge port 14.

[0083] See Figure 3 , in this embodiment, the first float 5 and the second float 7 are slidably connected to the valve core accommodation cavity 19. The specific connection method is as follows:

[0084] A plurality of vertically arranged first guiding slide rails 201 can be provided on the inner wall surface of the adapter housing 2. Corresponding first sliding grooves 501 are provided on the first float 5, and the first float 5 is slidably connected to the first guiding slide rails 201 through the first sliding grooves 501.

[0085] The sliding mode of the second float 7 is more complicated. Although the first float 5 and the second float 7 do not affect each other, the second float 7 needs to be arranged within the inner circle of the first float 5. Therefore, a hollow member 401 needs to be provided on the inner cavity bottom surface of the outer housing 4. The hollow member 401 and the inner cavity bottom surface cooperate to form a vertical guiding groove, and a plurality of vertically arranged second guiding slide rails 402 are provided on the inner wall surface of the hollow member 401. Corresponding second sliding grooves 701 are provided on the second float 7, and the second float 7 is slidably connected to the second guiding slide rails 402.

[0086] During actual implementation, the movement amount of the valve core assembly can be limited by designing the fitting clearance at the sliding connection, and at the same time, the contact area between the valve core assembly and the contacting components during the movement can be reduced, and the friction force between them can be reduced, making the valve core assembly more flexible during the movement and easier to open and close the corresponding discharge ports.

[0087] Furthermore, the slide rails and the sliding grooves can also be interchanged. Taking the first float 5 as an example, the first sliding groove 501 can be provided on the inner wall surface of the adapter housing 2, and the first guiding slide rail 201 can be provided on the first float 5.

[0088] In this embodiment, the pressure-holding part specifically includes a pressure-holding housing 12 and a pressure-holding cover 11. An accommodation space is provided inside the pressure-holding housing 12, and an inflow hole and an outflow hole communicating with the accommodation space are also provided on the pressure-holding housing 12. The pressure-holding housing 12 is provided on the top surface of the valve body, and the inflow hole is communicated with the second discharge port 14. The pressure-holding cover 11 is slidably connected to the accommodation space and is used to open and close the inflow hole. That is, the pressure-holding cover 11 presses on the inflow hole of the accommodation space by its own gravity to close the inflow hole. After the gas pressure in the valve core accommodation cavity 19 reaches a value that can offset the gravity of the pressure-holding cover 11, the pressure-holding cover 11 can be pushed to rise, so that the gas can enter the accommodation space through the inflow hole and be discharged to the fluid discharge chamber formed by the connecting flange 1 through the outflow hole.

[0089] Embodiment 2

[0090] Refer to Figures 6 to 8 , on the basis of the above-mentioned Embodiment 1, several preferred implementation manners of the sealing component 9 are further described as follows:

[0091] In this embodiment, the sealing component 9 can be specifically divided into two setting manners. The first is to be set on the inner cavity top surface of the valve core accommodation cavity 19, and the second is to be slidably connected inside the valve core accommodation cavity 19.

[0092] First, the first case is described as follows:

[0093] The sealing component 9 can specifically be several sealing members 901 respectively sleeved at the first discharge port 13 and the second discharge port 14, and each sealing member 901 extends a sealing ring into the valve core accommodation cavity 19, and the sealing rings can respectively connect the valve core accommodation cavity 19 to the first discharge port 13 or the second discharge port 14. At this time, when the first float 5 rises, it can contact and seal with the sealing ring corresponding to the first discharge port 13, separating the valve core accommodation cavity 19 from the first discharge port 13 to achieve the closing of the first discharge port 13. Similarly, when the second float 7 rises, it can contact and seal with the sealing ring corresponding to the second discharge port 14, separating the valve core accommodation cavity 19 from the second discharge port 14 to achieve the closing of the second discharge port 14.

[0094] Next, the second case is described. There are many implementable manners for this case. Therefore, based on the situation in the above-mentioned Embodiment 1 where the first float 5 is sleeved on the second float 7 and the centers of the first discharge port 13 and the second discharge port 14 are the same, some examples are given for illustration to facilitate understanding, as follows:

[0095] The overall idea is that the sealing component 9 includes a sliding member 902 and a sealing member 901. The sliding member 902 is used for sliding connection with the valve core accommodating cavity 19, and the sealing member 901 is arranged on the sliding member 902 and is used to cooperate with two floats to switch two discharge ports. Among them, the sliding member 902 and the sealing member 901 can be separated and assembled together, or integrally formed. The structure of the sliding member 902 part is relatively conventional. The following is mainly an explanation of the specific arrangement method of the sealing member 901:

[0096] Embodiment 1: The sealing member 901 is an annular sealing member 901, and the inner ring of the annular sealing member 901 corresponds to the second discharge port 14. A large sealing ring 9011 and a medium sealing ring 9012 are provided on the upper end surface of the annular sealing member 901.

[0097] Among them, the radius of the large sealing ring 9011 needs to be greater than the maximum radius of the first discharge port 13, and the radius of the medium sealing ring 9012 needs to be less than the minimum radius of the first discharge port 13 and the maximum radius of the second discharge port 14. Such a setting is to ensure that when the sealing member 901 is in the closed position, it can be closely attached to the inner and outer wall surfaces of the adapter housing 2 at the first discharge port 13 to achieve the sealing of the first discharge port 13.

[0098] After the first discharge port 13 is sealed, the second discharge port 14 is communicated with the valve core accommodating cavity 19 through the inner ring of the annular sealing member 901. In order to seal the second discharge port 14, a small sealing ring 9013 needs to be provided on the lower end surface of the annular sealing member 901, and the radius of the small sealing ring 9013 needs to be greater than the inner ring radius of the annular sealing member 901. The small sealing ring 9013 can contact the top surface of the second float 7 when the second float 7 rises and achieve the sealing of the second discharge port 14.

[0099] Embodiment 2: This embodiment is a modification of the above Embodiment 1. The sealing member 901 is also an annular sealing member 901. The setting methods of the large sealing ring 9011 and the small sealing ring 9013 remain unchanged, and the medium sealing ring 9012 is removed. Specifically, a medium extension ring 202 is provided on the inner cavity top surface of the adapter housing 2 on the wall surface between the first discharge port 13 and the second discharge port 14, and the lower end of the medium extension ring 202 is used to contact the upper end surface of the annular sealing member 901. When the annular sealing member 901 moves to the closed position, it cooperates with the large sealing ring 9011 to achieve the sealing of the first discharge port 13, and at the same time, it can cooperate with the inner ring of the annular sealing member 901 to achieve the communication between the second discharge port 14 and the valve core accommodating cavity 19. The sealing method of the small sealing ring 9013 is the same as that in Embodiment 1 and will not be elaborated.

[0100] Embodiment 3: This embodiment is also a modification of Embodiment 1 above. The seal 901 is also an annular seal 901. The setting method of the middle seal ring 9012 and the small seal ring 9013 remains unchanged, and the large seal ring 9011 is removed. Specifically, a large extension ring is provided on the inner wall surface of the top surface of the transfer housing 2 outside the first row of outlets 13, and the lower end of the large extension ring is used to contact the upper surface of the annular seal 901. When the annular seal 901 moves to the closed position, it cooperates with the middle seal ring 9012 to seal the first row of outlets 13. The sealing method of the middle seal ring 9012 and the small seal ring 9013 for the second row of outlets 14 is the same as that in Embodiment 1 and will not be elaborated.

[0101] Embodiment 4: This embodiment is also a modification of Embodiment 1 above. The seal 901 is also an annular seal 901. The setting method of the small seal ring 9013 remains unchanged, and the large seal ring 9011 and the middle seal ring 9012 are removed. Specifically, a large extension ring is provided on the inner wall surface of the top surface of the transfer housing 2 outside the first row of outlets 13, and the lower end of the large extension ring is used to contact the upper surface of the annular seal 9�1. A middle extension ring 202 is provided on the inner wall surface of the top surface of the transfer housing 2 between the first row of outlets 13 and the second row of outlets 14, and the lower end of the middle extension ring 202 is also used to contact the upper surface of the annular seal 901. When the annular seal 901 moves to the closed position, the large extension ring and the middle extension ring 202 cooperate with the annular seal 901 to seal the first row of outlets 13. The sealing method of the small seal ring 9013 for the second row of outlets 14 is the same as that in Embodiment 1 and will not be elaborated.

[0102] Embodiment 5: This embodiment is a modification of Embodiment 1 above. The seal 901 is also an annular seal 901. The large seal ring 9011, the middle seal ring 9012 and the small seal ring 9013 are all removed. Specifically, a large extension ring is provided on the inner wall surface of the top surface of the transfer housing 2 outside the first row of outlets 13, and the lower end of the large extension ring is used to contact the upper surface of the annular seal 901. A small extension ring 203 is provided on the inner wall surface of the top surface of the transfer housing 2 between the first row of outlets 13 and the second row of outlets 14. The upper diameter of the small extension ring 203 is larger than the inner diameter of the annular seal 901, and the lower diameter is smaller than the inner diameter of the annular seal 901, that is, the outer wall of the small extension ring 203 is used to contact the inner ring of the annular seal 901. When the annular seal 901 moves to the closed position, the cooperation between the annular seal 901 and the outer wall of the small extension ring 203 and the large extension ring achieve the sealing of the first row of outlets 13. The lower end of the small extension ring 203 cooperates with the upper surface of the small float to seal the second row of outlets 14.

[0103] Of course, in other embodiments, the sealing component 9 may also be arranged on the first float 5 and the second float 7, directly cooperating with the first discharge port 13 and the second discharge port 14 for sealing. There are many specific implementation manners, which are not specifically limited herein.

[0104] Embodiment III

[0105] Refer to Figure 2 , this embodiment is a further improvement on the structure of the third inflow channel 22 in the first embodiment above, specifically as follows:

[0106] This embodiment takes the inner side wall of the outer shell 4 and the outer side wall of the adapter shell 2 as circular for example, but the setting manners of the outer shell 4 and the adapter shell 2 can be various, which are not specifically limited herein.

[0107] The overall idea is to set a barrier member 21 on the third inflow channel 22 to limit the flow area of the third inflow channel 22. When the inflow pressure of the oil fluid is certain, the oil fluid flowing into the valve core accommodation cavity 19 will decrease.

[0108] Specifically, the barrier member 21 may be an annular barrier member 21 arranged on the inner side wall of the outer shell 4. The inner diameter of the annular barrier member 21 is larger than the outer diameter of the outer side wall of the adapter shell 2, so as to form a gap between the annular barrier member 21 and the adapter shell 2. The cross-sectional area of this gap is the flow area of the third inflow channel 22 here. The inner diameter of the annular barrier member 21 can be changed according to the required flow area size, or holes can be directly opened on the annular barrier member 21 to change the flow area. There are many specific implementation manners, which are not specifically limited herein.

[0109] In another embodiment, the barrier member 21 may be an annular barrier member 21 arranged on the outer side wall of the adapter shell 2. The outer diameter of the annular barrier member 21 is smaller than the inner diameter of the inner side wall of the outer shell 4, so as to form a gap between the annular barrier member 21 and the outer shell 4. The cross-sectional area of this gap is the flow area of the third inflow channel 22 here. The outer diameter of the annular barrier member 21 can be changed according to the required flow area size, or holes can be directly opened on the annular barrier member 21 to change the flow area. There are many specific implementation manners, which are not specifically limited herein.

[0110] In another embodiment, the barrier member 21 may be an annular barrier member 21 whose outer ring and inner ring are respectively connected to the inner side wall of the outer shell 4 and the outer side wall of the adapter shell 2. Holes are directly opened on the annular barrier member 21, and the flow area can be changed by the area and number of the holes. There are many specific implementation manners such as the shape and arrangement manner of the holes, which are not specifically limited herein.

[0111] In other embodiments, there may also be a number of barrier members 21 provided on the inner side wall of the outer shell 4, or on the outer side wall of the adapter shell 2, or connected to both the outer shell 4 and the adapter shell 2 simultaneously. The shape of the barrier members 21 can also be diverse. The cross-sectional area of the gap formed between the number of barrier members 21 and the adapter shell 2 is the flow area of the third inflow channel 22 at this location.

[0112] In this embodiment, a barrier member 21 is provided on the third inflow channel 22. When a large amount of fluid enters the valve core accommodation cavity 19 through the third inflow channel 22, it can play a role in relatively isolating the external fluid from the internal valve core, exerting a certain blocking effect on the fluid, and preventing the valve core assembly from closing prematurely due to a large influx of fluid. In addition, under harsh working conditions such as large shaking amplitudes, the fluid will enter the valve core accommodation cavity 19 through the third inflow channel 22 due to shaking. At this time, the design of the barrier member 21 will also relatively isolate the fluid from the valve core accommodation cavity 19, with less fluid entering the valve core accommodation cavity 19, reducing the impact of working conditions such as shaking on the valve core assembly. At the same time, since less fluid enters the valve core accommodation cavity 19, the probability of fluid leakage from the valve body during the dynamic process will be greatly reduced.

[0113] Embodiment Four

[0114] Refer to Figure 2 , this embodiment is a further improvement on the bottom surface structure of the outer surface of the outer shell 4 in the above-mentioned Embodiment One, specifically as follows:

[0115] The main purpose of the improvement scheme designed in this embodiment is to mitigate the impact of the oil on the second float 7 and prevent the second float 7 from rising prematurely due to the impact of the oil, resulting in the premature closing of the second discharge port 14.

[0116] Therefore, in this embodiment, the problem of the second float 7 rising due to the impact of the oil is alleviated by raising the minimum height of the second float 7.

[0117] Specifically, a raising structure 20 can be provided on the bottom surface of the inner cavity of the outer shell 4. The raising structure 20 is matched with the position of the second float 7, and the height can be determined according to the specific technical requirements for the second float 7. The hollow member 401 is installed on the top surface of the raising structure 20. In this way, the minimum height of the second float 7 is the top surface of the raising structure 20, and the oil needs to rise to the top surface of the raising structure 20 to have an impact on the second float 7.

[0118] The elevation structure 20 can be a cushion block, which can be a hollow structure, thus further reducing the overall weight of the valve. The elevation structure 20 can also be a depression provided on the bottom surface of the outer surface of the housing 4, forming a depression cavity, which is a protrusion on the bottom surface of the inner cavity from the perspective of the inner cavity. Installing the hollow member 401 on this protrusion can also raise the lowest position of the second float 7. Compared with directly providing the elevation structure 20 in the inner cavity, the setting of the depression cavity can cooperate with the bottom surface of the housing 4 to form an air cavity, so that when there is an oil impact, it can protect the second valve core assembly.

[0119] Both the fuel filling limit valve and the tilting valve have a theoretical closing height. That is, when the liquid level inside the fuel tank rises to a certain height, the floats inside the fuel filling limit valve and the tilting valve will rise until the exhaust passage is closed. However, when the liquid level rises to close the exhaust passage of the fuel filling limit valve, it is necessary to ensure that the tilting valve does not close, because at this time, the exhaust passage of the tilting valve is needed to relieve the pressure inside the fuel tank. Therefore, generally, the closing height of the tilting valve needs to be designed relatively higher to ensure that when the fuel filling limit valve is closed, the tilting valve is still in the open state.

[0120] In this embodiment, by providing an upward concave groove on the bottom of the outer surface of the housing 4 or directly providing a cushion block in the inner cavity, this method is an elevation design, which raises the lowest sliding position of the second float 7, so that the fluid entering the valve core accommodating cavity 19 needs to reach a certain height before the second float 7 can receive sufficient buoyancy and rise, avoiding the situation that the second float 7 rises prematurely and closes the second discharge port 14. At the same time, this elevation design can also ensure that when the fuel filling limit valve function is closed, the tilting valve function is still in the open state, that is, when the first discharge port 13 is closed, the second discharge port 14 is not closed. In addition, since the second float 7 is at a relatively high position, when in working conditions such as shaking, the fluid that can enter the valve core accommodating cavity 19 and impact the second float 7 will be relatively less, which also has a certain improvement on the leakage problem in the dynamic situation. In addition, the elevation design is an open groove, and an air cavity can be formed at the groove, which cooperates with the bottom surface of the housing 4 to protect the second valve core assembly and reduce the impact of oil.

[0121] Embodiment Five

[0122] See Figure 1 , this embodiment further illustrates the specific structure of the pressure maintaining part in Embodiment One above, as follows:

[0123] The design concept of the pressure-holding part is to design a component at the second row of outlets 14 that requires a certain pressure to open, so that when a certain pressure value is reached in the fuel tank, the gas will be discharged from the second row of outlets 14. Therefore, the pressure-holding part is specifically set as the pressure-holding shell 12 and the pressure-holding cover 11. The pressure-holding shell 12 is used as a connecting part connecting the second row of outlets 14, with an accommodation space left inside. The pressure-holding cover 11 is arranged in this accommodation space and is used to cover the inflow port connecting the accommodation space to the second row of outlets 14, and maintains the closure of the inflow port by its own gravity. When the pressure in the valve core accommodation cavity 19 is greater than or can offset the weight of the pressure-holding cover 11, the pressure-holding cover 11 is lifted, and the gas can be discharged.

[0124] Further, the pressure-holding cover 11 can be made of a material with a relatively large weight, or can be set in a way of combining a light material with an elastic member. When using an elastic member, the two ends of the elastic member are respectively connected to the upper end of the pressure-holding cover 11 and the top surface of the accommodation space, and the elastic force of the elastic member and the gravity of the pressure-holding cover 11 cooperate to form the pressing force required to close the inflow port.

[0125] See Figure 17 , when the height of the fluid discharge chamber formed by the valve body and the connecting flange 1 is relatively low, the thickness of the pressure-holding shell 12 can be designed to be thinner, and then the width of the pressure-holding shell 12 will become larger. Because when acting as a fuel filling limiting valve, the exhaust gas volume at the first row of outlets 13 is very large and requires a sufficiently large flow area. In order to prevent the pressure-holding shell 12 from being too wide and interfering with the first row of outlets 13, reducing the flow area of the first row of outlets 13, an extension pipe can be provided at the bottom of the pressure-holding shell 12. The two ends of the extension pipe are respectively connected to the inflow port and the second row of outlets 14 to raise the height of the bottom surface of the pressure-holding shell 12 so that it will not interfere with the top surface of the adapter shell 2, and thus will not affect the first row of outlets 13.

[0126] See Figure 18 , when the height of the fluid discharge chamber is relatively high, the width of the pressure-holding shell 12 can be designed to be smaller than the minimum diameter of the first row of outlets 13. In this way, the extension pipe can be not provided, and the inflow port can be directly connected to the second row of outlets 14. The volume of the accommodation space in this design is relatively small, and the volume of the pressure-holding cover 11 that can be accommodated is also relatively small. Therefore, the way of combining the pressure-holding cover 11 with the elastic member is more suitable for this design.

[0127] Embodiment Six

[0128] See Figure 1 and Figure 15 , this embodiment further illustrates the specific structure of the moving part 10 in the above Embodiment One, as follows:

[0129] The movable part 10 is assembled with the second float 7, and the second float 7 can perform a certain vertical axial movement within the valve core accommodation cavity 19. The assembly method of the movable part 10 and the second float 7 can be a "hinge type" rotating shaft structure, enabling the movable part 10 to perform a rotational movement along the axis on one side; or it can be a "slant plate type" structure. After the movable part 10 is assembled on the second float 7, its top surface forms a certain angle with the horizontal plane.

[0130] Furthermore, the movable part 10 can be rotationally connected to the top surface of the second float through a rotating shaft, forming a certain angle with the axis under the action of the second float 7 and its own gravity, and forming an opening with the communication channel formed by the second discharge port and the sealing component from one side for breathing and exhausting gas, forming a ventilation channel under high-pressure conditions, thereby releasing the pressure inside the fuel tank.

[0131] Among them, the purpose of the movable part 10 is that when the entire valve core, that is, both the first valve core component and the second valve core component are in the closed position, causing both the first discharge port 13 and the second discharge port 14 to be closed, the fuel tank may be under a certain pressure in some cases. At this time, at least one of the two valve cores needs to be opened in a timely manner to relieve the pressure inside the fuel tank. Since P = F / S, it can be seen that when F is constant, the larger S is, the smaller P is. That is to say, when there is a high pressure inside the fuel tank, due to the relatively large cross-sectional area S of the first discharge port 13 usually, it will open under a relatively low pressure. At this time, it is necessary to open through the second discharge port 14 in a timely manner to relieve the pressure inside the fuel tank. The combination of the movable part 10 and the second float 7 is to make it easier to open after being sealed with the small hole, realizing the pressure relief inside the fuel tank. Therefore, the combined structure of the movable part 10 and the second float 7 can be diverse, and its purpose is to achieve the function of making the small hole easier to reopen. Or the movable part 10 can be cancelled, and some structures can be made on the second float 7 to achieve the function of being easily reopened.

[0132] Embodiment Seven

[0133] A multifunctional combined valve in this embodiment includes the valve in any one of the above embodiments. Through the cooperation between the two valve core components in this embodiment, the functions of the fuel filling limiting valve and the flip valve can be achieved without mutual interference. At the same time, valves with different technical requirements can be obtained by respectively adjusting the performance of the two valve cores, solving the problem that the two valve cores in the existing valve affect each other.

[0134] The operation mode of the multifunctional combined valve under various working conditions will be described below:

[0135] 1. Refer to Figure 9, the fuel tank realizes the exhaust function of the refueling limit valve through a valve. This situation generally occurs when the fuel inside the fuel tank is not full, or it can be understood that the fuel inside the fuel tank does not overly submerge the first float 5 and the second float 7. At this time, both floats are in a dropped state, and the sealing component 9 does not form a seal with the first discharge port 13 and the second discharge port 14. At this time, the gas inside the fuel tank can be discharged through the first discharge port 13, and this valve functions as a refueling limit valve.

[0136] 2. Refer to Figures 10 to 12 , the valve realizes the refueling limit function of the refueling limit valve. The refueling limit function is the refueling cut-off function. Generally, there are two situations for the refueling cut-off of the fuel tank. But generally speaking, when the large air flow channel in the refueling limit valve is closed or narrowed, but refueling continues, it will cause the pressure inside the fuel tank to rise sharply, and the liquid level on the refueling pipe side will also rise sharply, resulting in refueling cut-off.

[0137] 2.1 When the first connection port 15 opened on the side of the base is relatively high, during refueling, when the fuel liquid level rises to the position of the first connection port 15, the fuel will instantaneously enter the valve core accommodating cavity 19 through the third inflow channel 22. At this time, the gravity of the whole composed of the first float 5 and the sealing component 9 slidably connected in the valve core accommodating cavity 19 may be less than the buoyancy of the fuel plus the elastic force of the first elastic member 6. Therefore, the first float 5 will drive the sealing component 9 to move upward until the sealing component 9 touches the inner cavity top surface of the adapter housing 2, and the sealing component 9 will block the first discharge port 13. In this way, the large exhaust channel in the valve will be closed, resulting in a sharp rise in the pressure inside the fuel tank, and then refueling cut-off is formed.

[0138] 2.2 Another situation where the valve has the function of a refueling limit valve. When the first connection port 15 opened on the base is relatively low, during refueling, when the liquid level reaches the lower edge of the first connection port 15 and then the fuel liquid level continues to rise, the ventilation window will become smaller and smaller, and thus the cross-sectional area of the air flow channel will also become smaller and smaller. In this way, the pressure inside the fuel tank will continue to rise as the air flow channel decreases until the pressure inside the fuel tank rises to a certain level, and then refueling cut-off is formed.

[0139] 3. Refer to Figure 13 and Figure 14, the first row of outlets 13 in the valve is closed, and the pressure in the fuel tank is relieved by the flip valve function. This situation generally occurs when the fuel tank is full or when some vehicles are at a certain inclination, causing the first float 5 and the sealing component 9 inside the valve core to rise, closing the first row of outlets 13. However, due to the overall difference between the gravity of the second float 7 and the moving part 10 minus the elastic force of the second elastic part 8 being relatively large, and there is still a relatively large downward gravity, the overall composed of the second float 7 and the moving part 10 does not rise. At this time, the communication channel of the sealing component 9 for communicating with the second row of outlets 14 is still open. However, since a pressure retaining part is provided above the second row of outlets 14 corresponding to the adapter housing 2, the valve as a whole is still in a relatively sealed state at this time. At this time, due to the continuous volatilization of the fuel inside the fuel tank or the influence of temperature rise, the pressure inside the fuel tank will continue to increase. This is when the flip valve function needs to be utilized to timely relieve the increased pressure inside the fuel tank. When the pressure inside the fuel tank rises high enough to blow up the pressure retaining cover 11, the pressure inside the fuel tank will then decrease, and the air flow will enter the valve core accommodation cavity 19 through the second inflow channel on the side of the outer housing 4, then through the communication channel on the sealing component 9 to the second row of outlets 14 on the adapter housing 2, then through the exhaust channel designed inside the pressure retaining housing 12, and finally discharged through the fluid discharge chamber.

[0140] 4. Refer to Figure 15 , when the vehicle is in motion, there may be severe shaking or a certain inclination, and the oil in the fuel tank will also shake violently. At this time, the first row of outlets 13 and the second row of outlets 14 inside the valve need to be sealed in time to prevent the oil in the fuel tank from leaking out through the outlets inside the valve. The first float 5 and the sealing component 9 will rise in time with the shaking to close the first row of outlets 13 on the adapter housing 2, and then the second and the moving component will also rise in time to close the communication channel corresponding to the sealing component 9. In this way, the entire valve core will form a sealed state to prevent dynamic fuel leakage.

[0141] During the shaking of the fuel tank, the valve core of the valve needs to be closed in time to prevent dynamic fuel leakage. This requires the valve core of the valve to be relatively flexible and can be closed in time during shaking. Therefore, for the valve with two mutually independent valve cores, the flexibility of the valve core is easier to adjust. Because the two valve cores inside are one on the outside and one on the inside, and the two valve cores have no direct connection, the ratio of the float to the spring of the two valve cores can be adjusted separately, and the flexibility of each valve core can be adjusted individually to achieve the purpose of preventing fuel leakage.

[0142] 5. Refer to Figure 16, during the fuel sloshing process mentioned in the above 4, the two valve cores can be closed in time to prevent dynamic fuel leakage. At the same time, after the valve cores are closed in time, the valve cores need to not only be closed in time but also be opened in time during the fuel sloshing process. Because when the valve cores are closed in time, the interior of the fuel tank will be in a completely sealed state, so the internal pressure will increase accordingly. At this time, the flip valve function of the valve needs to be opened in time to relieve the pressure inside the fuel tank.

[0143] From P = F / S, it can be known that when F is constant, the larger the contact area S, the smaller P. Since the area of the first row of outlets 13 corresponding to the first float 5 and the sealing component 9 inside the valve core is relatively large, when there is a certain pressure inside the fuel tank, it is very difficult for the first valve core component to be opened in time for pressure relief. Therefore, at this time, the small holes corresponding to the second float 7 inside and the movable component need to be opened in time for pressure relief function.

[0144] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, provided that these changes fall within the scope of the claims of the present invention and its equivalent technologies, they still fall within the protection scope of the present invention.

Claims

1. A valve, characterized in that: Including valve body, valve core and pressure maintaining part; A valve core accommodating chamber is provided in the valve body; a first inflow channel and a second inflow channel are provided on the valve body, communicating with the valve core accommodating chamber and the external space of the valve body, and the inlet of the second inflow channel is higher than the inlet of the first inflow channel; a first discharge port and a second discharge port are provided at the upper end of the valve body, communicating with the valve core accommodating chamber; The valve core portion includes a first valve core component and a second valve core component, and the valve core portion also includes a sealing component; The first valve core assembly and the second valve core assembly are respectively connected to the valve core accommodating cavity in a vertical sliding manner, and their movement trajectories do not interfere with each other, and are respectively used to open and close the first discharge outlet and the second discharge outlet; The pressure maintaining portion is provided on the top surface of the valve body, and the input end thereof is communicated with the second discharge port, and is used to limit the pressure required to discharge the fluid from the second discharge port; After the first valve core assembly closes the first discharge port, the fluid in the valve core accommodating chamber must reach a certain pressure value, and then the pressure maintaining portion will open the second discharge port, and the fluid will be discharged from the second discharge port to realize the flip valve function. The two valve core assemblies realize different functions without affecting each other. At the same time, by adjusting the two valve core assemblies separately, a combination valve with different technical requirements can be obtained; The valve body includes an outer shell with an upward opening and a transfer shell with a downward opening; the outer shell is sleeved on the lower end of the transfer shell and is fixedly connected to the transfer shell; The inner wall surface of the adapter shell cooperates with the bottom surface of the outer shell to form the valve core accommodating chamber; the shell body of the outer shell is provided with at least one first connecting port, and the first connecting port, the outer wall surface of the adapter shell, and the inner wall surface of the outer shell cooperate to form a third inflow channel connected to the valve core accommodating chamber; The housing of the adapter housing is provided with at least one second connection port communicating with the valve core accommodating cavity, and the first connection port and the second connection port cooperate to form the first inflow channel; At least one third connection port is provided on the outer shell, and at least one fourth connection port connected to the valve core accommodating cavity is provided on the shell of the adapter shell. The third connection port, the fourth connection port and the connecting channel of the sealing assembly cooperate to form the second inflow channel.

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

3. The valve according to claim 2, wherein The sealing assembly is provided on the top surface of the valve core accommodating cavity, and the sealing assembly is a sealing member; the sealing member is provided at the first discharge port and the second discharge port; The sealing member forms a communication passage connecting the first discharge port and the valve core accommodating chamber, and is used to cooperate with the first valve core assembly to open and close the first discharge port; the sealing member forms a communication passage connecting the second discharge port and the valve core accommodating chamber, and is used to cooperate with the second valve core assembly to open and close the second discharge port.

4. The valve according to claim 2, wherein The sealing assembly is slidably connected to the valve core accommodating cavity, and the sealing assembly includes a sliding member and a sealing member; The sliding member is slidably connected to the valve core accommodating cavity, and the sealing member is installed on the sliding member; the sealing member is provided with a sealing block for sealing the first discharge port, and is also provided with a communication channel for communicating with the second discharge port; The sliding member is driven by the first valve core assembly to slide up and down, and cooperates with the sealing block to open and close the first discharge outlet; the communication channel connected to the second discharge outlet is used to cooperate with the second valve core assembly to open and close the second discharge outlet.

5. The valve according to claim 1, wherein It also includes a connecting flange; the connecting flange is connected to the valve body and cooperates with the top surface of the valve body to form a fluid discharge chamber for guiding the fluid discharged from the first discharge port and the pressure maintaining part.

6. The valve according to claim 1, wherein A plurality of vertically arranged first guide rails are provided on the inner wall surface of the adapter housing, and the first valve core assembly is slidably connected to the first guide rails; A hollow part is provided on the bottom surface of the inner cavity of the shell, and the hollow part and the bottom surface of the inner cavity cooperate to form a vertical guide groove. A plurality of vertically arranged second guide rails are provided on the inner wall surface of the hollow part; the second valve core assembly is slidably connected to the second guide rail.

7. The valve according to claim 6, wherein The first valve core component is sleeved on the hollow part and the second valve core component.

8. The valve according to claim 1, wherein The first valve core assembly includes a first float and a first elastic member; the first float is slidably connected to the valve core accommodating cavity, and two ends of the first elastic member are respectively connected to the first float and the bottom surface of the valve core accommodating cavity.

9. The valve according to claim 1, wherein The second valve core assembly includes a second float, a second elastic member, and a movable member; the second float is slidably connected to the valve core accommodating chamber, and the two ends of the second elastic member are respectively connected to the second float and the bottom surface of the valve core accommodating chamber; the movable member is movably connected to the top surface of the second float, and is used to cooperate with the sealing assembly to open and close the second discharge port.

10. The valve according to claim 1, wherein The pressure-maintaining part includes a pressure-maintaining shell and a pressure-maintaining cover; a accommodating space is provided in the pressure-maintaining shell, and an inlet hole and an outlet hole connected to the accommodating space are also provided on the pressure-maintaining shell; the pressure-maintaining shell is provided on the top surface of the valve body, and the inlet hole is connected to the second outlet; the pressure-maintaining cover is slidably connected to the accommodating space and is used to open and close the inlet hole.

11. The valve according to claim 1, wherein The third inflow channel is provided with a blocking member for limiting the flow area of the inflow channel.

12. The valve according to claim 6, wherein An upwardly concave groove is provided on the bottom surface of the shell, and the groove corresponds to the second valve core assembly and is used to raise the lowest sliding height of the second valve core assembly.

13. A multifunctional combination valve, characterized in that: The invention comprises a valve according to any one of claims 1 to 12.

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