Combined multifunctional filling limiting vent valve

Abstract

The invention relates to a ventilation valve having a housing, the housing having a side wall part and a cover part, the side wall part and the cover part at least partially enclose an inner space, the cover part is provided with at least one first opening for filling ventilation and at least one second opening for dynamic ventilation, a float is arranged in the housing, the center of gravity of the float is moved on a movement path depending on the filling level, and wherein the float has a first sealing element and a second sealing element on the side thereof facing the cover, and wherein the ventilation valve has three different operating states. In addition, the invention relates to a fuel tank.

Description

Technical Field

[0001] This invention relates to a multifunctional fill-limiting vent valve. The fill-limiting vent valve is used to ventilate and / or aerate the fuel tank of a motor vehicle during filling and / or during vehicle operation. The fill-limiting vent valve is installed in the fuel tank and has at least one inlet opening through which a fuel vapor-air mixture is guided into the valve and from there through an outlet opening to the atmosphere, typically in the case of an intermediate connection of an activated carbon filter and / or a liquid phase separator. The fill-limiting vent valve has the following functions: limiting the filling height during filling, and especially preventing fuel leakage in the event of a vehicle rollover. Background Technology

[0002] According to existing technology, a multi-functional fill-limiting vent valve is constructed with at least two floats. Here, the first float is designed to open or close the outlet opening for operational venting during operation. The second float is designed to open and close the outlet opening for filling venting. The latter is particularly used to limit the liquid level in the tank. The floats are arranged side-by-side with each other. Such valves are known from EP 3 599 122 B1 and EP 1 786 645 B1. The structure with two floats has relatively large space requirements.

[0003] Furthermore, it is known that the second float can serve as a carrier for the first float. Such a structure is known, for example, by EP 0 845624 A2 and WO 2018 034448 A1. The valve described in WO 2018 034448 A1 has the following: an upper cover mounted on a fuel container and having an outlet pipe; a housing connected to the upper cover; a float elastically mounted inside the housing in a manner that allows it to move upward and downward, and a first valve seat mounted on one side of the upper part of the float such that the first valve seat opens and closes the first outlet attachment by a lever principle and has a concave side constructed on one side of the upper side of the float; a plate elastically mounted on the concave side by a second spring, the concave side being constructed on the float, and opening and closing the second outlet attachment when the plate moves upward and downward; and a lower cover constructed such that the cover closes the lower part of the housing, and the float is elastically mounted by the first spring.

[0004] In this configuration, due to structural reasons, the float tilts within the valve body. This tilting can cause the sealing element to tilt relative to the valve seat and close poorly or late, leading to increased so-called liquid-carry-over, i.e., liquid being discharged through the valve. In applications where the valve is on or inside a fuel tank, where the vent outlet is connected to an activated carbon filter, this is undesirable. Liquid is carried into the activated carbon filter, contaminating it and rendering it unusable.

[0005] EP 4 253 809 A1 discloses a valve having a first float and a second float. The valve further includes a sealing assembly disposed on the upper end of a cavity or on the upper end of a first valve insert, the first valve insert including the first float. The sealing assembly may have a seal, selectively having a large sealing ring, a medium sealing ring, and a small sealing ring. Additionally, the document discloses a movable element disposed on a second valve insert, the second valve insert including a second float.

[0006] DE 10 2005 036 932 B3 discloses a vent valve for a fuel container in a motor vehicle. The valve has a sealing element on the upper side of a float. This sealing element may, in particular, have a central perforation for fastening and is designed to seal opposite openings.

[0007] JP 2003 185 046 A relates to a liquid shut-off valve having a first float and a second float. The valve is configured to have a first valve and a second valve, the first valve having a large valve opening for allowing fuel vapor to escape, and the second valve having a cantilever and a smaller opening for replenishing filler.

[0008] US 2002 / 0040730 discloses a valve having two valve openings. Additionally, this document discloses a two-stage shut-off method for an alternative valve having two openings. Summary of the Invention

[0009] The objective of this invention is to at least partially improve upon, and in particular eliminate, the aforementioned disadvantages. In particular, a multi-functional fill-limit vent valve is provided that is space-saving and significantly reduces liquid discharge.

[0010] The objective of this invention is achieved through the subject matter of claim 1. A suitable configuration is derived from the dependent claims.

[0011] The venting valve according to the invention has a housing. The housing may include a sidewall portion and a cover portion, the sidewall portion and the cover portion at least partially surrounding an internal space. The cover portion is provided with at least a first opening for filling venting and at least one second opening for dynamic venting.

[0012] A float is arranged within the housing, and the center of gravity of the float moves along a trajectory according to the liquid level. The float has a first sealing element and a second sealing element in the area facing the cover.

[0013] Suitablely, exactly one float can be arranged in the shell.

[0014] In the first operating state, both openings are open. That is, not only the first opening but also the second opening allows the passage of gaseous fluid, such as air or a fuel-air mixture. This is particularly significant during filling. The first and second sealing elements are in the open position.

[0015] In the second operating state, both openings are closed. This is suitable for the maximum liquid level. Here, the second opening is closed by means of a second sealing element. That is, the second sealing element is in the shut-off position. The first opening is closed by means of the first sealing element and / or the second sealing element. In particular, the first sealing element is also in the shut-off position.

[0016] In the third operating state, the tank should be largely closed, but pressure spikes should be avoided, for example. Therefore, here, venting or shutting off is dynamically determined, depending on the position of the tank contents, through small openings. For this purpose, the first opening is closed by means of a first sealing element. That is, the first sealing element is in the shut-off position. The one or more second openings are open.

[0017] The first sealing element can move relative to the second sealing element in the y direction, thereby changing the distance between the first sealing element and the second sealing element.

[0018] The orbits of the float's center of gravity, the orbits of the first sealing element's center of gravity, and the orbits of the second sealing element's center of gravity are located on the same straight line extending in the y direction.

[0019] This arrangement of the center of gravity prevents the float from tipping over, and the valve closes with improved reliability, preventing liquid from being discharged through the valve.

[0020] The movement of the sealing element from the open position to the closed position is in the positive y direction.

[0021] Preferably, the internal space is at least partially opened at its lower side to allow for exchange with the storage volume of the tank. Here, "lower" refers to the direction of gravity in the valve's installed state. In the installed state, the direction of gravity is antiparallel to the y-direction; that is, gravity acts vertically downwards, while the y-direction points upwards.

[0022] Alternatively or additionally, the sidewall portion of the housing has one or more inlet openings for fluid exchange.

[0023] Fluids can exist in particular as gases, liquids, aerosols, foams, particles, or other types of aggregates. Fluids can also be air, fuel-air mixtures, or fuels.

[0024] A float can consist of a single functional module or multiple functional elements of the same or different types. Preferably, a float is exactly one functional module. In particular, a float has a buoyancy body, and suitably, it has exactly one buoyancy body.

[0025] The housing can be substantially cylindrical, for example, particularly having curved sidewalls or sidewalls with multiple sides and edges, and thus multiple sidewalls. The housing cover, particularly on its upper side facing away from the interior space, has an attachment and / or outlet leading to the filter, or is connected to a corresponding attachment / outlet. The cover can be configured on its inner side to have one or more guiding elements for guiding the float. The sidewalls of the housing extend particularly parallel to the y-direction. In particular, the housing has a central axis along the y-direction. The cover and sidewalls of the housing can be integrally implemented as a first housing component.

[0026] The housing is designed to connect to tanks, especially fuel tanks, so that the float changes its position according to the filling height in the tank.

[0027] The first opening is designed as the main venting opening. With the first opening open, the corresponding canister can be filled. The first opening is designed to be closed to limit canister filling at a pre-defined filling height, while the second opening is designed for dynamic venting. The second opening should be closed, especially during periods of vigorous motion, particularly those caused by driving dynamics or vehicle rollover.

[0028] Preferably, the centers of gravity of the two sealing elements and the float are arranged on a common central axis. That is, the trajectory of the center of gravity extends along the central axis of the housing.

[0029] Preferably, the first opening is provided with a first valve seat, which works together with the first sealing element to seal the first opening.

[0030] Preferably, the second opening is provided with a second valve seat, which works together with the second sealing element to seal the second opening.

[0031] In the y-direction, the first sealing element has a variable spacing from the second sealing element. The spacing between the sealing elements should be understood in particular as the distance between the sealing areas on the first sealing element and the sealing areas on the second sealing element. Specifically, the first sealing element can be movably supported on the float, particularly the float body. The second sealing element can be firmly connected to the float body, or can also be movably supported on the float body, allowing the first sealing element to move relative to the second sealing element.

[0032] The vent valve according to the invention has a compact structure. The vent valve can be configured as a module or as having a flanged housing.

[0033] In one configuration, the first sealing element and the second sealing element are arranged concentrically with each other.

[0034] In another configuration, the first sealing element is arranged spaced apart from the second sealing element in the y-direction. In particular, the first sealing element is arranged above the second sealing element in the vertical direction when the vent valve is installed.

[0035] In one configuration, the second sealing element is annularly constructed. Here, the second sealing element may or may not have a surrounding sealing lip. Such a sealing lip can be cylindrical or conically open, such that the sealing element is constructed as a hollow cylinder with a bottom or as a shell. In such a configuration, the surrounding sealing lip can be the sealing area of ​​the sealing element. Alternatively, the sealing element can have multiple protruding sealing areas, each corresponding to a second opening. In the configuration with multiple sealing areas, these sealing areas are suitably arranged symmetrically. Suitably, the second sealing element has a central through-hole through which the first sealing element connects to the float. The central through-hole can be part of an assembly that allows for simplified reopening from a second operating state. Furthermore, the second sealing element is suitably rotationally symmetrically configured.

[0036] In one configuration, the second sealing element is secured to the float by means of a sealing carrier, such as a locking element.

[0037] In one configuration, the first sealing element may have a cylindrical foot region and a head element. The foot region particularly has a cylindrical segment. The head element may be constructed, for example, flat, particularly circular, or arched, particularly umbrella-shaped. Suitably, the head element has a larger cross-section than the foot region. The first sealing element is particularly rotationally symmetrical. In particular, at least the head element of the first sealing element is rotationally symmetrical.

[0038] Suitably, the first sealing element is held in a stationary position spaced apart from the second sealing element, particularly elevated and / or spaced apart in the y-direction, by means of a spring, especially a helical spring. The spring extends, in particular, as an outer cover around the foot region of the first sealing element and is supported against the underside of the head element. The spring may be supported at its opposite end, particularly against the second sealing element or a float. The float may be connected to the first sealing element by means of a connecting element or sealing carrier, in one configuration of which is constructed as a locking element, and / or the float may have a guiding element for guiding the first sealing element as it deviates from its stationary position.

[0039] Suitablely, the first opening is a central borehole, and the ventilation channels are arranged circumferentially around the first opening as second openings.

[0040] In one configuration, at least one second opening is provided with a pressure-holding function, and in particular, each second opening is provided with a pressure-holding function. The pressure-holding function is formed, in particular, by a ring placed on a support portion. Such a ring can be made of, for example, metal or plastic. The support portion is constructed on a side facing away from the inner side of the valve housing. Optionally, the vent valve according to the invention is configured such that a pressure-holding function can also be added.

[0041] The first opening is arranged spaced apart from at least one second opening in the y-direction. Preferably, if the y-direction is vertical, the first opening is arranged above the second opening. In particular, the first valve seat is arranged spaced apart from the second valve seat in the y-direction. Preferably, if the y-direction is vertical, the first valve seat is arranged above the second valve seat. Thus, a height difference is created between the first opening and the second opening.

[0042] In one configuration, the first sealing element is designed such that fluid can flow only along the surface of the first sealing element in the first operating state. Therefore, the first sealing element does not have a through opening or perforation through which fluid can flow.

[0043] In one configuration, the float further includes a sealing carrier, which can be integral, two-part, or multi-part, wherein the sealing carrier is arranged between one side of the float and the other side, such that the first and second sealing elements face the cover portion of the housing, wherein the sealing carrier particularly has a perforation, which is particularly centrally located in the region of the float's longitudinal axis, and / or wherein the sealing carrier is arranged on the float in a manner movable along the float's longitudinal axis. The sealing carrier may have a locking element for fastening.

[0044] In one alternative, the second sealing element extends partially into the sealing carrier.

[0045] In another alternative, the vent valve includes a third sealing element disposed on the sealing carrier between the second sealing element and the float. In the case of a two-piece or multi-piece sealing carrier, such a third sealing element can be disposed between two sealing carrier components.

[0046] In one configuration, the third sealing element is tongue-shaped, wherein the third sealing element is particularly arranged between the first sealing element carrier component and the second sealing element carrier component to sealably close the perforation in the first sealing element carrier component, which is connected to the second sealing element.

[0047] In an alternative configuration, the third sealing element has a drilled hole that is aligned with the perforation.

[0048] Suitably, the housing has a bottom. The bottom and the cover are opposite each other. The bottom can be configured as a second housing component, which can be fastened to the sidewall and / or the first housing component. Alternatively, the second housing component can also include a sidewall that can then be connected to the cover. A guide element for guiding the float, especially the float body, can extend from the bottom. Suitably, an additional spring is arranged between the bottom and the float, especially the float body, wherein the additional spring generates a force in the direction toward the cover of the housing. The additional spring can be, in particular, a helical spring. The helical spring can be arranged on the guide element. Thus, by means of the additional spring, a closing force can be applied to the sealing element through the float, which ensures the closure of the valve in the event of vehicle rollover, especially overturning. In the installation state defined above, the spring force and the buoyancy act in parallel.

[0049] The valve has an inlet in the bottom of the housing and / or in the side wall of the housing. Through said inlet, the liquid level inside the housing can be leveled with the liquid level outside the housing.

[0050] Suitablely, the housing is provided with anti-sway protection. Such anti-sway protection should in particular limit lateral forces caused by fluid movement due to changes in driving dynamics. Such anti-sway protection can be formed, for example, by one or more additional sidewalls extending upward from the bottom, arranged in a manner spaced inward from the sidewall portion of the housing. These additional sidewalls may be spaced apart from the cover portion.

[0051] Suitablely, the additional sidewalls are constructed integrally with the bottom.

[0052] The fuel tank according to the invention has a vent valve according to the invention. Attached Figure Description

[0053] The invention will now be described in more detail with reference to the accompanying drawings and the description of embodiments, as well as to other features and advantages. These are illustrated in the schematic diagrams: Figure 1a The cross-section of the valve is shown in the first operating state; Figure 1b Show Figure 1a Detailed view; Figure 2a The cross-section of the valve is shown in the third operating state; Figure 2b Show Figure 2a Detailed view; Figure 3a The cross-section of the valve is shown in the second operating state; Figure 3b Show Figure 3a Detailed view; Figure 4 This shows another configuration of the valve in the first operating state. Figure 5 This illustrates another configuration in the region of the valve element. Figure 6 This illustrates an alternative configuration in the region of the valve element. Figure 7 The configuration in the region of the valve element is shown. Figure 8 The configuration in the region of the valve element is shown. Figure 9 An exploded view showing an alternative configuration of the float; and Figure 10 Show Figure 9 Exploded view of the sealing carrier of the float in the middle Detailed Implementation

[0054] Figures 1a to 3a The cross-sections of the vent valve in different states are shown. Figures 1b to 3bEnlarged views of the segments are shown separately. The vent valve 2 has a housing 4. The housing 4 includes at least a cover 6 and sidewalls 8. The housing 4 encloses an internal space. A float 10 is housed within the internal space of the vent valve. The float 10 can move in or against the y-direction depending on the liquid level, i.e., vertically upward and downward in the shown orientation. The float 10 has a float body 11. The cover 6 of the housing 4 has at least one first opening 16. The first opening 16 can be configured as a central bore. This first opening 16 is used for venting. A first valve seat 14 can be arranged on the inner side of the cover 6 around the first opening 16. A first sealing element 12 can close the first opening 16 in a manner that interacts with the valve seat 14 or the surface surrounding the first opening, thereby allowing or disallowing venting. The first sealing element 12 is arranged in the region of the float 10 facing the cover 6. Additionally, the cover 6 may have a guide element 42 protruding toward the float 10, which prevents the float 10 from moving laterally or tipping relative to the central axis 24.

[0055] Additionally, the cover 6 of the housing 4 has at least one second opening 22. One or more second openings are arranged radially outward around the first opening 16. Suitably, the cover 6 has a plurality of second openings 22, as shown in FIG. 1, which are arranged in the circumcircle surrounding the first opening 16. The second openings 22 may be configured as venting channels. The second valve seat 20 is arranged around each second opening 22, or around all the second openings 22 as shown in FIG. 1, such that the second sealing element 18, arranged on the float 10 facing the cover, closes all the second openings 22 by means of the second valve seat 20. Alternatively, the surface surrounding the second opening 22 is configured such that the second sealing element 18, together with the surface, closes the second opening 22.

[0056] In the configuration shown in Figures 1 to 3, the first opening 16 is arranged above the second opening 22 in the y direction, and in particular, the first valve seat 14 is also arranged above the second valve seat 20.

[0057] The first sealing element 12 and the second sealing element 18 each have a center of gravity located on the central axis 24. In the diagram, the central axis extends vertically. The float 10 and the float body 11 also have their centers of gravity on the central axis 24, such that all centers of gravity are arranged collinearly and located on the central axis 24. Therefore, the float with two sealing elements is less prone to tipping, resulting in improved closing characteristics of the valve.

[0058] The first opening 16 and the second opening 22, or all of the second openings 22, are through openings between the interior space of the housing 4 and the attachment nozzle 34. The attachment nozzle 34 is, in particular, a flange connection. Figure 1aIn this tank, the vent valve is installed in the tank 100 such that the attachment pipe 34 is arranged outside the tank 100, and the housing of the vent valve is substantially arranged inside the tank 100.

[0059] The one or more second openings 22 may have a pressure holding function 26 on the side facing the attachment pipe, which may be in the form of a flat ring, for example.

[0060] The sidewall portion 8 of the housing 4 may have inlet openings 32 (not shown). These inlet openings 32 are used to balance the liquid level outside the housing 4 and the liquid level inside the housing 4. In the current configuration, the housing 4 additionally has a bottom 44, wherein the bottom 44 closes the housing 4 downward. One or more additional sidewalls 46 may extend from the bottom 44, and these additional sidewalls are arranged at a distance from the sidewall portion 8, more precisely, within the interior space of the housing 4.

[0061] Additionally, one or more guide elements 48 for the float can extend from the bottom 44, which guide the float 10 when it floats up in order to prevent the float 10 from shifting.

[0062] Additionally, the bottom 44 can be used to support the second spring 30, which presses the float 10 upward. In the installed state, both the buoyancy and the spring force of the second spring 30 act vertically upward. When the valve tilts due to driving dynamics, such as in the event of a vehicle accident, especially a rollover, the second spring 30 particularly supports the buoyancy and closure of the valve, because in this case, despite the rollover, the second spring 30 still functions to close the valve.

[0063] The functions of the vent valve are as follows: exist Figure 1a The diagram shows a first operating state of the vent valve 2, in which the first sealing element 12 and the second sealing element 18 are spaced apart from their respective valve seats, and thus both sealing elements are in the open position. The first sealing element 12 is positioned above the second sealing element 18. This position of the first sealing element 12 is maintained, in particular, by a first spring 28, which is currently constructed as a helical spring. The first sealing element 12 is implemented here in an umbrella shape. The second sealing element 18 is implemented as a ring, which has an upward-facing sealing lip 62 on its outer circumferential surface.

[0064] Figure 2aThe third operating state is shown. In this third operating state, the first sealing element 12 contacts the first valve seat 14 and closes the first opening 16. To close the first opening, the buoyancy of the float, and if necessary, the buoyancy of the additional spring 30, must be greater than the force of the first spring 28 and the weight. This force distribution can be supplemented by the upward suction caused by the high ventilation rate during filling, which leads to premature closure of the first opening. A fluid connection exists between the interior space of the housing 4 and the attachment pipe 34 through the second opening 22. In this third operating state, only the first sealing element 12 is in the closed position, while the second sealing element 18 is in the open position.

[0065] Figure 3a The second operating state of the vent valve is now shown. In the second operating state of the vent valve 2, the second sealing element 18 and the second valve seat 20 work together to close the one or more second openings 22. Therefore, the second sealing element 18 is in the closed position. Additionally, in the illustrated embodiment, the first sealing element 12 is in the closed position. The vent valve, thus closed, cannot allow venting. In this operating state, the upper side of the first sealing element 12 is closer to the upper side of the second sealing element 18, meaning the distance between the first sealing element 12 and the second sealing element 18 is greater in the first and third operating states than in the second operating state. In this operating state, the first spring 28 is compressed.

[0066] Figure 1bA magnified view of a section of the regions of the two sealing elements 12, 18 is shown. As shown here, the second sealing element 18 can be secured to the float 10 by means of locking elements 36, 38. Furthermore, the locking element 36 has at least one guide element 40, in which a groove or blind hole is formed within or between the guide elements 40 to guide the first sealing element 12, within which the foot region of the first sealing element 12 can move. The foot region 50 of the first sealing element is substantially cylindrical and has an outwardly oriented protrusion 52 in the end section away from the head element, which restricts the upward movement of the first sealing element 12 in conjunction with the guide element 40. In the illustrated embodiment, the head element 54 of the first sealing element 12 is umbrella-shaped. A first spring 28 maintains the distance between the first sealing element 12 and the second sealing element 18, the first spring being supported against the head element 54 of the first sealing element 12 and against the second sealing element 18 on its other side, or against the locking element 36 as shown here. Here, the second sealing element 18 has an annular region 60 and a sealing lip 62, with a sealing region 64 arranged at the upper end of the annular region. The second sealing element 18 may be provided with a borehole 66 having an opening cross-section much smaller than the first and second openings, for easier reopening of the valve, i.e., to switch the vent valve from the second operating state to the first or third operating state. Alternatively, the borehole 66 may be provided in a third sealing element 80, which can be sealed shut by the third sealing element 80 in conjunction with the face of the locking element 38. Other known configurations for simplifying the reopening of the vent valve may also be provided. Figure 2b and Figure 3b The corresponding segment magnification is shown in other operating states.

[0067] Figure 4 An alternative configuration of the vent valve in a first operating state is schematically shown. In this configuration, an inlet opening 32 is shown in the side wall portion 8. These inlet openings 32 are arranged in such a way that the additional side wall 46 prevents fluid from flowing directly through the inlet openings 32 to the float 10, and thus provides anti-sloshing protection. These inlet openings 32 can also be arranged in the aforementioned configuration.

[0068] Figure 5 An alternative configuration of the first sealing element 12 is shown. The head element 54 of the first sealing element 12 is configured in a plate shape rather than an umbrella shape.

[0069] Figure 6 An alternative configuration is shown. The difference in this configuration is particularly that the spacing between the first sealing element 12 and the second sealing element 18 in the static state of the two sealing elements is greater than that shown in Figures 1 to 18. Figure 4The implementation shown is small.

[0070] In response, Figure 7 and Figure 8 This shows another configuration. Figure 7 A configuration of the second sealing element 18 is shown, which is designed as an annular disk having an annular region 60 but without a sealing lip. The first sealing element 12 is arranged here in the rest position at the same height as the second sealing element 18.

[0071] Figure 8 A configuration of the second sealing element 18 is shown, in which the second sealing element 18 has an annular region 60, from which different sealing regions 64 are arranged upward, i.e., in the y-direction. The sealing regions 64 are coordinated with the second opening 22 and are arranged rotationally symmetrically.

[0072] Those skilled in the art can combine different embodiments of the first sealing element and the second sealing element, as well as their positioning relative to each other.

[0073] Figure 9 An exploded view showing an alternative configuration of the float 10 is shown. The float 10 has a float body 11. The float body 11 may have a groove 49 in its lower region. The float 10 has a first sealing element 12 on its upper side. The sealing element 12 has a head element 54 and a foot region 50. The head element 54 is rotationally symmetrical and umbrella-shaped. The foot region has two elements extending from the head element, on which protrusions 52 for engagement are respectively arranged. In addition, the float has a sealing carrier 35. Here, the sealing carrier 35 is formed by a first sealing carrier component 35a and a second sealing carrier component 35b. The first sealing carrier component 35a has a second sealing element 18 on its upper side. The second sealing element 18 has a surrounding sealing lip 62, which has a sealing region 64 on its upper side. The first sealing carrier component 35a has a guide element 40 on its upper side, which extends centrally through the second sealing element 18. The guide element 40 is configured such that the foot region 50 of the first sealing element 12 can be guided therein and can move in the y-direction. Additionally, the guide element 40 is configured such that the first spring 28 can be arranged between the first sealing element 12 and the second sealing element 18, so that the first sealing element 12 is held in a pre-tensioned position.

[0074] The first sealing carrier component 35a has a through-hole 70, which is configured in a keyhole shape, as particularly in Figure 10As shown in the diagram, the perforation 70 has a sealing region 71 surrounding it, which is particularly convex in configuration. Additionally, the first sealing element carrier component 35a has downwardly extending locking protrusions 36c, i.e., extending away from the second sealing element. The locking element 36b of the second sealing element carrier component 35b can be inserted into these locking protrusions 36c. The second sealing element carrier component 35b is configured such that it has a perforation 72 extending from its lower side to its upper side and converging in a recess 74 disposed on its upper side. Furthermore, at least one recess 74 is disposed on the upper side of the second sealing element carrier component 35b, designed for inserting and securing the third sealing element 80. The third sealing element 80 can be configured in a tongue-like shape with a first end and a second end, wherein a fastening section 84, particularly a protruding fastening section 84, is provided on the first end. This fastening section is designed to secure the third sealing element 80 in an additional opening 76. The third sealing element 80 is particularly designed to sealably close the perforation 70. Through the configuration of the tongue-shaped third sealing element 80, the perforation 72 in the second sealing carrier component 35b, and the keyhole-shaped perforation 70, an improved ventilation rate and simplified valve reopening can be achieved.

[0075] List of reference numerals 2. Vent valve 4. Shell 6. Covering section 8. Side wall portion 10 floats 11 floating body 12 First sealing element 14 First valve seat 16 First Opening 18 Second sealing element 20 Second valve seat 22 Second opening 24. Vertical central axis 26. Pressure holding function 28 First Spring 30 Second Spring 32 Input opening 34. Attached pipe 35 Sealing Carrier 35a First sealing element carrier component 35b Second sealing carrier component 36 Locking components 38. Locking element 40 Guiding elements 42 Guiding elements 44 Bottom 46 Other sidewalls 48. Guiding element 49. Trench 50 Foot area 52 Protrusion 54 Head components 60 Circular Area 62 Sealing Lip 64 Sealed Area 66 Drilling 70 perforations 71. Elevated portion 72 Other perforations 74. Empty space 76. Other blank areas 80 Third sealing element 82 Sealed Section 84 Fastening Section 100 fuel tanks.

Claims

1. A vent valve (2) having a housing (4). in, The housing (4) has a sidewall portion (8) and a cover portion (6), which at least partially surround the interior space. The covering part (6) is provided with at least a first opening (16) for filling ventilation and at least one second opening (22) for dynamic ventilation. A float (10) is arranged in the housing (4), wherein the center of gravity of the float moves on a motion track according to the liquid level, and wherein the float (10) has a first sealing element (12) and a second sealing element (18) on its side facing the cover. In the first operating state, the first opening (16) is open and allows gaseous fluid to pass through, and the at least one second opening (22) is open and allows gaseous fluid to pass through. In the second operating state, at least one second opening (22) is closed by means of the second sealing element (18) to prevent the passage of fluid, and the first opening (16) is closed to prevent the passage of fluid. In the third operating state, the first opening (16) is closed by means of the first sealing element (12) to prevent the passage of fluid, and the at least one second opening (22) is open and allows the passage of gaseous fluid. The first sealing element (12) is movable in the y-direction relative to the second sealing element (18), thereby changing the distance between the first sealing element (12) and the second sealing element (18). The orbits of the center of gravity of the float, the orbits of the center of gravity of the first sealing element, and the orbits of the center of gravity of the second sealing element are located on the same straight line extending in the y direction.

2. The vent valve (2) according to claim 1. in, The first sealing element and the second sealing element (12, 18) are arranged concentrically with each other.

3. The vent valve (2) according to any one of the preceding claims, wherein, The first sealing element (12) is arranged spaced apart from the second sealing element (18) in the positive y direction.

4. The vent valve (2) according to any one of the preceding claims. in, The second sealing element (18) is annularly constructed.

5. The vent valve (2) according to any one of the preceding claims, wherein, The first sealing element (12) has a cylindrical foot region (50) and a head element (54), wherein the first sealing element (12) is constructed in particular rotationally symmetrical manner, or wherein the head element (54) is constructed in particular rotationally symmetrical manner.

6. The vent valve (2) according to any one of the preceding claims. in, The first sealing element (12) is held in a stationary position spaced apart from the second sealing element (18) by means of a spring (28), especially a helical spring.

7. The vent valve (2) according to any one of the preceding claims, wherein, The first opening (16) is a central borehole, and the ventilation channels are arranged in a circumferential direction around the first opening (16) as a second opening (22).

8. The vent valve (2) according to any one of the preceding claims, wherein, The at least one second opening (22), and in particular each second opening (22) is provided with a pressure holding function (26).

9. The vent valve (2) according to any one of the preceding claims, wherein, The first opening (16) is arranged spaced apart from at least one second opening (22) in the positive y direction, wherein, in particular, the first valve seat (14) is arranged spaced apart from the second valve seat (20) in the positive y direction.

10. The vent valve (2) according to any one of the preceding claims, wherein, The first sealing element (12) is designed such that when in the open state, fluid can only flow along the surface of the first sealing element (12).

11. The vent valve (2) according to any one of the preceding claims, wherein, The float further has a sealing carrier (35) which can be implemented integrally, in two parts or in multiple parts, wherein the sealing carrier is arranged between one side of the float (11) and the other side of the first sealing element (12) and the second sealing element (18), such that the first sealing element (12) and the second sealing element (18) face the cover of the housing, wherein the sealing carrier (35) has in particular a perforation (70), the perforation being arranged particularly centrally in the region of the longitudinal axis of the float (10), and / or wherein the sealing carrier (35) is arranged on the float (11) in a manner movable along the longitudinal axis of the float (10).

12. The vent valve (2) according to claim 11, wherein, The second sealing element (18) extends partially into the sealing carrier (35).

13. The vent valve (2) according to claim 11 or 12, the vent valve further comprising a third sealing element (80) disposed on the sealing carrier (35) between the second sealing element (18) and the float (11).

14. The vent valve (2) according to claim 13, wherein, The third sealing element (80) is tongue-shaped, wherein the third sealing element (80) is particularly arranged between the first sealing element carrier component (35a) and the second sealing element carrier component (35b) to sealably close the perforation (70) in the first sealing element carrier component (35a), which is connected to the second sealing element (18).

15. The vent valve (2) according to claim 13, wherein, The third sealing element (80) has a drilled hole (66) that is aligned with the perforation (70).

16. The vent valve (2) according to any one of the preceding claims, wherein, The housing (4) has a bottom (44) opposite to the cover (6), wherein an additional spring (30) is arranged between the bottom (44) and the float (10), wherein the additional spring (30) generates a force toward the cover (6).

17. The vent valve (2) according to any one of the preceding claims, wherein, The housing (4) is provided with anti-shaking protection.

18. A fuel tank (100) having a vent valve (2) according to any one of the preceding claims.

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