Poppet valve device, tank vent solenoid, and method for improving poppet valve seal efficiency

Abstract

A poppet valve device is presented comprising a valve stem, a poppet valve core having a sealing surface and formed separately from the valve stem, wherein the poppet valve core is actuatable via the valve stem, and wherein following an imaginary line parallel to the longitudinal direction of the valve stem in the closing direction of the poppet valve core, the sealing surface passes by in front of the front end of the valve stem.

Description

Existing technology

[0001] This invention relates to a lift valve device, a tank ventilation solenoid valve and / or a tank purification solenoid valve, and a method for improving the sealing efficiency of the lift valve.

[0002] Various types of lift valve designs are known from the prior art. Typically, to achieve sufficient sealing efficiency, these lift valves must be aligned and guided very precisely. This is especially true if the sealing surface of the lift valve is located on the front side of the lift valve, unlike many lift valves in internal combustion engines.

[0003] The object of the present invention is, in particular, to provide a method having advantageous features regarding valve leakage sealing. According to the invention, this object is achieved by the features of the independent patent claims, while advantageous embodiments and further developments of the invention can be obtained from the dependent claims.

[0004] Advantages of the present invention

[0005] The present invention relates to a lift valve device, which includes a valve stem and a lift valve core, the lift valve core having a sealing surface and being formed separately from the valve stem, wherein the lift valve core is preferably linearly actuated via the valve stem.

[0006] It is recommended that an imaginary line, parallel to the longitudinal direction of the valve stem, be drawn along the closing direction of the lift valve core, with the sealing surface passing before the front end of the valve stem. This design achieves advantageous characteristics regarding valve sealing performance. Advantageously, it ensures a particularly tight and / or robust fit between the sealing surface of the lift valve and the valve seat. This invention advantageously provides improved valve sealing stability.

[0007] "Lift valve device" should be understood in particular as a valve or valve component having a plate-shaped or disc-shaped valve plug, i.e., a lift valve core actuated by a rod (i.e., valve stem). Preferably, the lift valve forms part of a tank ventilation solenoid valve system, such as a tank ventilation valve in a tank ventilation solenoid coil system. However, alternative applications within alternative devices or systems are conceivable. Preferably, the lift valve core moves linearly within a valve guide, which can be a pipe, container, or the like. Typically, the lift valve core has a circular or elliptical disc shape; however, other disc shapes, such as polygonal or concave disc shapes, are conceivable. Preferably, the lift valve core is arranged near the end region of the valve stem. The valve stem is preferably implemented as a straight rod, which in particular has a circular or elliptical or otherwise shaped cross-section. In particular, the valve stem is directly or indirectly actuated by an electromagnet / magnetic actuator system. The valve stem particularly carries and / or actuates the lift valve core. The lift valve core includes a sealing surface configured to provide a sealing function for the lift valve when interacting with a valve seat. The sealing surface is located, in particular, at the front end of the lift valve spool. The sealing surface preferably faces away from the valve stem and / or the electromagnet / magnetic actuator system. The sealing surface is particularly oriented in a direction at least substantially parallel to the longitudinal extension / direction of the valve stem. Preferably, at least under no-load conditions, the sealing surface is located on the surface of the lift valve spool, which is arranged at least substantially perpendicular to the longitudinal extension / direction of the valve stem.

[0008] By forming the valve core and valve stem independently of each other, it should be particularly understood that the valve stem and valve core are each independent entities and / or components; for example, they act only on each other but are not necessarily materially bonded together. The valve stem is preferably configured to push the valve core towards or away from the valve seat. Furthermore, it is conceivable that the valve stem can also pull the valve core to some extent; however, this function is secondary or optional. The longitudinal direction of the valve stem extends, in particular, at least substantially parallel to the central longitudinal axis of the valve stem and / or parallel to the principal direction of the valve stem's extension. The "principal direction of extension" of an object should be particularly understood as a direction parallel to the longest edge of the smallest geometric body that just completely encloses the object. The longitudinal direction of the valve stem extends, in particular, at least substantially perpendicular to the principal extension plane of the valve core and / or the sealing surface. The "principal extension plane" of an object should be particularly understood as a plane parallel to the largest side surface of the smallest imaginary cuboid that just completely encloses the structural unit, especially passing through the center of the cuboid. When the lift valve spool changes from the "open" to the "closed" state of the valve, the closing direction of the lift valve spool is preferably the direction of movement of the lift valve spool. In most cases, the closing direction points away from the electromagnet / magnetic actuator system of the lift valve; however, it is also conceivable that the closing direction points towards the electromagnet. The end of the valve stem in the closing direction is further away from the electromagnet / magnetic actuator system than the sealing surface. As the lift valve spool moves in the closing direction, the sealing surface of the lift valve moves towards the valve seat. In many configurations of the lift valve assembly, in the "open" configuration of the lift valve, the tip of the valve stem is closer to the valve seat than the sealing surface. The tip of the valve stem is particularly the end of the valve stem away from the electromagnet / magnetic actuator system. Preferably, when viewed along the closing direction, the tip of the valve stem contacts the lift valve below the sealing surface. Preferably, when viewed along the closing direction, the actuation point of the valve stem is below the sealing surface. In particular, the term "configuration" should be understood as specifically programmed, designed, and / or equipped. "Configuration" can be specifically understood as an object used for a certain function, which implements and / or performs that specific function in at least one application and / or operational state.

[0009] Furthermore, it is proposed that the lift valve core can be tilted relative to the valve stem, particularly at least up to 5°, preferably tilted in any tilting direction, and / or the valve stem can be tilted relative to the lift valve core, particularly at least up to 5°, preferably tilted in any tilting direction. This design allows for advantageous characteristics regarding valve sealing. In particular, this design advantageously allows for increased perpendicularity tolerances and / or positional tolerances while still providing a tight and secure valve seal. The tiltability between the valve stem and the lift valve core can advantageously compensate for a certain amount of misalignment. Preferably, at least the lift valve core can be tilted in at least a substantially fixed orientation relative to the valve stem. Additionally or alternatively, the valve stem also has some degree of tiltability relative to the lift valve core. Preferably, the permissible tilt between the valve stem and the lift valve covers an angle range of at least 0° to 7°, more preferably at least 0° to 5°, and advantageously, at least 0° to 3° in all possible tilting directions. Preferably, the lift valve provides a tight and secure valve seal between the valve stem and the lift valve core with an inclination angle of at least 7°, more preferably at least 5°, and advantageously at least 3°.

[0010] Furthermore, a receiving recess is provided in the lift valve core for insertion into the end of the valve stem. In this way, advantageous force transmission from the valve stem to the lift valve core can be achieved. Furthermore, advantageous direction of force transmission from the valve stem to the lift valve core can be achieved. The receiving recess is configured to receive the front end of the valve stem. The front end of the valve stem preferably contacts the bottom of the receiving recess. When the lift valve core is actuated in the closing direction, the front end of the valve stem preferably pushes against the bottom of the receiving recess. The receiving recess preferably completely surrounds the end of the valve stem on its circumference. The receiving recess particularly receives at least 5% of the total length of the valve stem, preferably at least 10%, more preferably at least 15%, and advantageously at least 20%. The receiving recess particularly receives at most 40% of the total length of the valve stem, preferably at most 35%, more preferably at most 30%, and advantageously at most 25%. The receiving recess is arranged at least substantially centrally within the lift valve core.

[0011] When the valve stem and the lifting valve core are connected via a clearance fit, a favorable degree of tilt between the valve stem and the lifting valve core can be ensured during the operation of the lifting valve, which in turn improves the sealing performance of the valve seal. In particular, the tilt tolerance allows for reduced production / parts costs due to the lower manufacturing precision required. The receiving recess preferably includes an inner diameter that is at least in cross-section larger than the outer diameter of the portion of the valve stem to be inserted into the receiving recess. In particular, the clearance fit is at least a "loose-run" clearance fit, a "free-run" clearance fit, or a "tight-run" clearance fit (according to the corresponding ISO definition, e.g., DIN EN ISO 286-1:2019).

[0012] Furthermore, when the gap between the valve stem and the inner wall of the receiving recess of the lifting valve core is larger at the opening of the receiving recess than at the bottom of the receiving recess, a favorable relationship between the tiltability of the valve stem within the lifting valve core and a good fit can be achieved. The difference between the inner diameter of the receiving recess and the outer diameter of the valve stem is preferably greater at the opening of the receiving recess than at the bottom of the receiving recess. To achieve this, the inner diameter of the receiving recess preferably increases from the bottom toward the opening. Alternatively or additionally, the outer diameter of the valve stem may decrease from the bottom toward the opening. In particular, the inner diameter of the receiving recess at the opening is at least 5%, preferably at least 10%, larger than the inner diameter at the bottom of the receiving recess. In particular, the inner diameter of the receiving recess is larger than the outer diameter of the valve stem over the entire receiving recess. Alternatively, it is conceivable that the inner diameter of the receiving recess and the outer diameter of the valve stem become approximately equal toward the bottom of the receiving recess. In particular, the gap between the valve stem and the receiving recess increases gradually and preferably continuously from the bottom of the receiving recess toward the opening of the receiving recess. Alternatively, a gradual increase in the gap may also be considered.

[0013] In this configuration, when the inner diameter of the receiving recess is larger at the opening of the receiving recess than at the bottom of the receiving recess, a favorable relative tilt between the valve core and the valve stem can be achieved. Furthermore, by selecting an increased diameter, the maximum possible tilt angle can be advantageously set to some extent. Advantageously, the inner wall of the receiving recess is tilted towards the vertical axis at least 1.5°, preferably at least 2°, more preferably at least 2.5°, and particularly preferably at most 3.5°.

[0014] Furthermore, it is proposed that the distance between the sealing surface of the lift valve core and the front end of the valve stem, measured parallel to the closing direction, be greater than 30% of the maximum diameter of the valve stem, preferably greater than 40%, and more preferably greater than 45%. This advantageously achieves particularly good stability and / or a particularly tight valve seat for the lift valve. The maximum diameter of the valve stem is preferably measured in the connection area between the lift valve core and the valve stem.

[0015] Furthermore, it is proposed that the distance between the sealing surface of the lift valve core and the front end of the valve stem, measured parallel to the closing direction, be at least 5% of the sealing diameter of the sealing surface, and particularly at least 7.5% of the sealing diameter of the sealing surface. This advantageously allows for particularly good stability and / or a particularly tight valve seat in the lift valve. "Sealing diameter of the sealing surface" should be understood in particular as the minimum diameter of the portion of the sealing surface that contacts the valve seat when the lift valve is closed.

[0016] Advantageously, a receiving recess completely surrounds the end of the valve stem. This advantageously allows for angular symmetry in tiltability. The receiving recess specifically covers the circumference and end / front of the valve stem. The end / front of the valve stem does not protrude from the lift valve core on the side opposite to the electromagnet / magnetic actuator system. The lift valve core is implemented as an end cap, particularly a closed end cap for the valve stem.

[0017] Furthermore, it is proposed that the receiving recess of the lift valve core be formed into a dome shape, which protrudes from the disc-shaped area of ​​the lift valve core in the closing direction. This allows for advantageous characteristics regarding stability and durability. Preferably, the dome shape protrudes from the lift valve core in a direction perpendicular to the sealing surface. Preferably, the dome shape protrudes from the lift valve core in a direction representing the straight extension of the valve stem. Preferably, the diameter of the dome shape is smaller than the outer diameter of the sleeve forming the receiving recess.

[0018] Furthermore, it is proposed that the receiving recess has the maximum wall thickness in the direction parallel to the closing direction. Therefore, high stability and durability can be advantageously achieved, particularly since the wall of the portion bearing the greatest force applied by the electromagnet provides the maximum wall thickness. Specifically, the wall thickness of the receiving recess in the closing direction is substantially greater than (at least twice as great) the average wall thickness of the receiving recess in the direction perpendicular to the closing direction.

[0019] Furthermore, it is proposed that the receiving recess of the lift valve core is formed in a tubular shape, protruding from the disc-shaped region of the lift valve core in a direction opposite to the closing direction. This allows for advantageous guidance of the valve stem and its permissible movement relative to the lift valve core. Preferably, at least a majority of the lift valve core forming the receiving recess for insertion into the end of the valve stem is made of a material having much higher elasticity and / or much higher flexibility than one of the valve stems. Preferably, the valve stem is made of metal, and at least a majority of the lift valve is made of plastic. Although the valve stem may also be made of plastic, or the lift valve may also be made of metal, the opposite (lift valve core = metal; valve stem = plastic) is also conceivable.

[0020] Furthermore, a lift valve device including a magnetic actuator system is proposed to generate movement of the valve stem along and / or against the closing direction. This allows for advantageous characteristics regarding the controllability of the lift valve. The magnetic actuator system includes a magnetic coil and a magnetic anchor, which is actuated by a change in the magnetic field generated by the magnetic coil. Magnetic actuator systems are well known in the prior art and will not be described in further detail here.

[0021] Furthermore, it is proposed that when energized, the magnetic actuator system generates a force, particularly a closing or opening force, which pushes the valve stem towards the lifting valve core. The lifting valve core is then pushed towards or away from the valve seat, thereby pressing the sealing surface onto or removing it from the valve seat. This allows for a lift valve with a closing mechanism and direction, which is advantageous for many applications and significantly different from the operating principle of most internal combustion engine lift valves. Specifically, the closing force pushes the lifting valve core in the closing direction. Furthermore, the average force direction of the magnetic actuator system is parallel to the closing direction and / or longitudinal direction of the valve stem.

[0022] A magnetic actuator system is also proposed, comprising a magnetic anchor attached to the rear end of the valve stem. This allows for advantageous controllability of the lift valve. The rear end of the valve stem is opposite the front end of the valve stem in the longitudinal direction. The valve stem is preferably frictionally engaged with the magnetic anchor. Alternatively or additionally, the valve stem may be connected to the magnetic anchor by force-fit and / or form-fit connection. The magnetic anchor is preferably made primarily of a magnetic material, particularly a ferromagnetic material, such as magnetic steel or iron. The valve stem is preferably made of a material that is at least substantially non-magnetic, such as aluminum.

[0023] Furthermore, a lift valve device is proposed that includes a reset unit configured to reset the lift valve core to its initial position, particularly in the de-energized state of the magnetic actuator. This allows for advantageous valve characteristics. Additionally, this advantageously achieves a clearance fit between the valve stem and the lift valve core. The reset unit is preferably implemented as a mechanical reset unit, such as a spring, for example a compression spring. The reset unit is positioned opposite the valve stem, particularly relative to the lift valve core. Preferably, the reset unit is in a fully compressed state when the valve stem is forcibly actuated by the magnetic actuator system. Preferably, the reset unit is in a fully relaxed state when the magnetic field of the magnetic coil of the magnetic actuator system is deactivated.

[0024] Furthermore, it is proposed that the lift valve device be either a normally open lift valve or a normally closed lift valve, with the normally open lift valve being a more useful configuration for tank exhaust solenoid valves. This allows for advantageous operating characteristics, particularly depending on the respective application area.

[0025] If the reset unit is implemented as a reset spring supported at the lift valve spool, a particularly simple and cost-effective normally open or normally closed lift valve can be achieved. Specifically, the reset spring is supported on the side of the lift valve spool, which also includes a sealing surface. Preferably, the sealing surface at least substantially surrounds and / or encloses the spring valve support area at the lift valve spool.

[0026] Furthermore, a lift valve is proposed to provide a receiving recess for inserting the end of the valve stem, wherein at least a portion of the return spring surrounds the outer side of the receiving recess, and particularly surrounds the end portion of the valve stem. This allows for a particularly advantageous inherent stability of the lift valve. Specifically, the return spring surrounds and / or encircles a dome shape that protrudes from the disc-shaped region of the lift valve core in the closing direction. Specifically, at least two 360° windings of the return spring are wound around the dome shape, which protrudes from the disc-shaped region of the lift valve core in the closing direction. Specifically, the diameter of the return spring increases with the distance from the lift valve core in the closing direction. The opposite ends of the return spring are preferably supported at the inner wall of the lift valve housing. The return spring is preferably implemented as a conical spring, with its conical apex facing the lift valve core of the lift valve.

[0027] Furthermore, it is proposed that the outer diameter of the return spring at the end of the return spring facing the lift valve core, particularly at the conical apex of the conical return spring, corresponds to at least one-quarter, preferably at least one-third, and more preferably at least 40% of the sealing diameter of the sealing surface. Specifically, the outer diameter of the return spring at the end of the return spring facing the lift valve core corresponds to at most 50% of the sealing diameter of the sealing surface, preferably at most 45%, and most preferably at most 40%. This advantageously achieves particularly good stability and / or a particularly tight valve seat for the lift valve. When viewing the spring from the top along its axis, the "spring outer diameter" is preferably measured at the relatively outermost point of the circumference of the spring wire.

[0028] Furthermore, the reset unit is configured to maintain the relative longitudinal position of the valve stem with respect to the lift valve core, particularly in the "open" state of the lift valve. This allows for a stable, reliable, and functional design of the lift valve core, while still allowing for flexible tilting. A return spring pushes the lift valve core towards the front end of the valve stem. The return spring preferably ensures that the valve stem remains within the receiving recess at all times. Specifically, the return spring ensures that the front end of the valve stem remains in contact with the bottom of the receiving recess.

[0029] Furthermore, a can venting solenoid valve and / or a can purging solenoid valve with a lift valve device are proposed. Moreover, within this can venting solenoid valve and / or can purging solenoid valve, the lift valve device is applied to controllably block or open the flow path between the filter media and the carbon canister. This allows for effective control of the can venting solenoid valve and / or can purging solenoid valve, which possesses highly reliable valve performance and valve sealing. The can venting solenoid valve is part of an evaporative emission control (EVAP) system, whose primary purpose is to prevent environmentally harmful fuel system leaks by preventing gasoline vapors from escaping the fuel system and entering the atmosphere. Therefore, the can venting solenoid valve controls the opening and closing of the fuel vapor line leading to the carbon canister.

[0030] Furthermore, another lift valve device is proposed, comprising a valve stem and a lift valve core having a sealing surface and being formed separately from the valve stem. The lift valve core is actuated via the valve stem, and the valve stem is tiltably connected to the lift valve core via a clearance fit. Therefore, during operation of the lift valve, a favorable tilting degree between the valve stem and the lift valve core can be ensured, which in turn improves the sealing performance of the valve seal. In this case, the lift valve device again includes a reset unit configured to maintain the relative longitudinal position of the valve stem with respect to the lift valve core in any normal actuation state. This allows for a stable, reliable, and functional yet still flexibly tiltable design for the lift valve core, and indeed, for the lift valve itself.

[0031] Furthermore, a method for improving the sealing efficiency of a lift valve is proposed, wherein the lift valve core is connected to a separately formed valve stem in a manner that allows for a limited angular movement of the valve stem relative to the sealing surface of the lift valve core. Therefore, during the operation of the lift valve, a favorable degree of inclination between the valve stem and the lift valve core can be ensured, which in turn improves the sealing performance of the valve seal.

[0032] The lifting valve device, tank ventilation solenoid valve, and / or tank purification solenoid valve of the present invention, as well as the method for improving the sealing efficiency of the lifting valve according to the present invention, are not limited to the applications and embodiments shown above or below. In particular, to achieve the functions described herein, the lifting valve device according to the present invention, the tank ventilation solenoid valve and / or tank purification solenoid valve according to the present invention, and the method for improving the sealing efficiency of the lifting valve according to the present invention may include a plurality of corresponding elements and / or structural components and / or units and / or method steps in a number different from those mentioned herein. The features described in the dependent claims may be combined in any way, as long as this does not lead to any contradiction. Attached Figure Description

[0033] Further advantages will become apparent from the following description of the accompanying drawings. An exemplary embodiment of the invention is depicted in the drawings. The drawings, description, and claims contain multiple features in combination. Those skilled in the art will also purposefully consider these features individually and will find further advantageous combinations.

[0034] As shown in the figure:

[0035] Figure 1a This is a schematic cross-sectional view of the lift valve device for the tank ventilation solenoid valve and / or tank purification solenoid valve.

[0036] Figure 1b This is a magnified cross-sectional view of a lift valve assembly.

[0037] Figure 2 This is a schematic flowchart of a method for improving the sealing efficiency of a lift valve.

[0038] Description of exemplary embodiments

[0039] Figure 1a A cross-sectional view of the (closed) lift valve assembly 70 is schematically shown. (For ease of understanding) Figure 1a The components of the lift valve assembly 70 are primarily shown as rotationally symmetrical. Needless to say, one or more components may deviate from rotational symmetry without prejudice to the invention. The lift valve assembly 70 forms part of the tank venting solenoid valve and / or the tank purification solenoid valve 68. The lift valve assembly 70 is used within the tank venting solenoid valve and / or the tank purification solenoid valve 68 to controllably block or unblock the flow path 72 between the filter media and the carbon canister (neither of which is shown in the figures). Figure 1aThe lift valve device 70 is in the normally open state.

[0040] The lift valve device 70 includes a valve stem 10. The valve stem 10 is configured as a metal rod. The valve stem 70 has a longitudinal extension. The valve stem 70 extends primarily along the longitudinal direction 18. The lift valve device 70 includes a lift valve core 12. The lift valve core 12 is formed separately from the valve stem 10. There is no form fit or physical bond between the valve stem 10 and the lift valve core 12. However, alternatively, a partial form fit connection or partial physical bond connection between the valve stem 10 and the lift valve core 12 is conceivable. The lift valve core 12 can be actuated by the valve stem 10. The lift valve core 12 follows any movement of the valve stem 10 at least along the longitudinal direction 18.

[0041] The lift valve core 12 has a partially disc-shaped shape. The lift valve core 12 includes a disc-shaped region 44. The lift valve assembly 70 includes a valve seat 52. The lift valve assembly 70 includes a lower housing 78. Figure 1a In the example shown, the valve seat 52 is integrally formed with the lower housing 78. The lower housing 78 forms the boundary of the flow path 72 within the lift valve assembly 70. The lower housing 78 includes an inlet 80 and an outlet 82 of the flow path 72. Figure 1a In this configuration, the lift valve assembly 70 is shown in a "closed" configuration, where the flow path 72 between the inlet 80 and the outlet 82 is blocked. The lift valve core 12 is configured to close the flow path 72 by tightly fitting onto the valve seat 52. The lift valve core 12 has a sealing surface 14. The sealing surface 14 is configured to contact the valve seat 52 to achieve a tight fit on the valve seat 52. The contact surface of the sealing surface 14 has a sealing diameter 40, which substantially corresponds to the diameter of the valve seat 52. Figure 1a In the exemplary description, the body 74 of the lift valve spool 12 and the region 76 of the lift valve spool 12 including the sealing surface 14 are made of two different materials. For example, the body 74 is made of metal or hard plastic, while the region 76 having the sealing surface 14 is made of flexible rubber. Alternatively, the lift valve spool 12 may be made of a single component. When the valve stem 10 is actuated toward the closing direction 20 of the lift valve spool 12, the lift valve spool 12 moves toward the valve seat 52. When the lift valve spool 12 is firmly seated on the valve seat 52, the flow path 72 between the inlet 80 and the outlet 82 is blocked. When the valve stem 10 is actuated against the closing direction 20 of the lift valve spool 12, the lift valve spool 12 moves away from the valve seat 52.

[0042] Along the closing direction 20 of the lift valve core 12, following an imaginary line 16 parallel to the longitudinal direction 18 of the valve stem 10, the sealing surface 14 of the lift valve core 12 and the front end 22 of the valve stem are arranged within the ready-to-use lift valve assembly 70 as follows: first through the sealing surface 14, then through the front end 22 of the valve stem 10. When viewed along the closing direction 20, any imaginary plane extending perpendicularly to the closing direction 20 and / or to the longitudinal direction 18 of the valve stem 10 and contacting the front end 22 of the valve stem 10 lies behind / deeper than any other imaginary plane extending perpendicularly to the closing direction 20 and / or to the longitudinal direction 18 of the valve stem 10 and contacting the sealing surface 14.

[0043] The lift valve device 70 includes a magnetic actuator system 50. Figure 1a An exemplary magnetic actuator system 50 is configured to generate movement of valve stem 10 along the closing direction 20. When energized, the magnetic actuator system 50 generates a force that pushes valve stem 10 toward a lifting valve core 12, which in turn pushes valve core 12 toward a valve seat 52, thereby pressing sealing surface 14 onto valve seat 52. The magnetic actuator system 50 includes a magnetic coil 84. The magnetic coil 84 is configured to generate a magnetic field. The magnetic actuator system 50 includes a magnetic anchor 54. The magnetic anchor 54 is movably supported. The magnetic anchor 54 is primarily located within the magnetic coil 84. The magnetic anchor 54 responds to the magnetic field of the magnetic coil 84. When Figure 1a When the magnetic field of the magnetic coil 84 is activated, the magnetic anchor 54 is pulled further towards the center of the magnetic coil 84 due to magnetic resistance. The magnetic anchor 54 is connected to the rear end 56 of the valve stem 10. The valve stem 10 is inserted into the receiving recess 86 of the magnetic anchor 54. The valve stem 10 is engaged with the magnetic anchor 54 at least in a frictional manner. The valve stem 10 follows the movement of the magnetic anchor 54. The lift valve device 70 includes an upper housing 88. The upper housing 88 surrounds the magnetic actuator system 50. The lower housing 78 and the upper housing 88 are tightly connected to each other in the region below the magnetic coil 84 and above the highest position of the lift valve core 12. The front end 22 of the valve stem 10 is further away from the magnetic anchor 54 and / or the magnetic coil 84 than the sealing surface 14 of the lift valve core 12.

[0044] The lift valve assembly 70 includes a reset unit 58 for resetting the lift valve spool 12 to its initial position after the force generated by the magnetic actuator system 50 closes. The reset unit 58 maintains the relative longitudinal position of the valve stem 10 relative to the lift valve spool 12. The reset unit 58 is configured to maintain the relative longitudinal position of the valve stem 10 relative to the lift valve spool 12 in any conventional actuation state of the lift valve assembly 70. The reset unit 58 is implemented as a return spring 60. The return spring 60 is implemented as a compression spring / coil spring. The return spring 60 has a conical shape, with the apex (smaller) end 66 pointing towards the magnetic actuator system 50 / lift valve spool 12. One end 66 of the return spring 60 is supported on the lift valve spool 12. The other end 94 of the return spring 60 is supported on a bracket 90 at the inner wall 92 of the lower housing 78. Figure 1a In this configuration, the magnetic coil 84 is activated, the lifting valve core 12 is pressed onto the valve seat 52, and the return spring 60 is tensioned.

[0045] Figure 1b An enlarged view schematically shows the portion of the lift valve assembly 70 surrounding the lift valve spool 12, with the lift valve assembly 70 in a partially "open" configuration. The lift valve spool 12 is tiltable relative to the valve stem 10. Figure 1b As shown, the exemplary maximum tilt angle 96 is approximately 3.5°. This allows for a certain tolerance in the perpendicularity of the valve seat of the valve core 12 on the valve seat 52 (e.g., Figure 1b(See range 98 in the diagram). The lift valve core 12 provides a receiving recess 24 for inserting the end 26 of the valve stem 10. In the ready-to-use configuration of the lift valve device 70, the receiving recess 24 completely surrounds the end 26 of the valve stem 10. The valve stem 10 is inserted into the receiving recess 24 with a clearance fit. The valve stem 10 and the lift valve core 12 are connected by a clearance fit. The valve stem 10 and the lift valve core 12 are tiltably connected relative to each other. The clearance between the valve stem 10 and the inner wall 28 of the receiving recess 24 of the lift valve core 12 is greater at the opening 30 of the receiving recess than at the bottom 32 of the receiving recess 24. The inner diameter 34 of the receiving recess 24 is greater at the opening 30 of the receiving recess than at the bottom 32 of the receiving recess 24. The inner diameter 34 of the receiving recess 24 increases continuously from the bottom 32 to the top opening of the receiving recess. The shape of the receiving recess 24 is similar to a tube closed at one end. The bottom 32 of the receiving recess 24 is completely closed by a lower sidewall. The front end 22 of the valve stem 10 contacts the lower sidewall of the receiving recess 24 at the bottom 32 of the receiving recess 24. During closing, the valve stem 10 pushes against the lower sidewall of the receiving recess 24 at the bottom 32 of the receiving recess 24. The receiving recess 24 of the lift valve core 12 forms a dome shape 42. The dome shape 42 protrudes from the disc-shaped region 44 of the lift valve core 12 in the closing direction 20. The receiving recess 24 includes its maximum wall thickness 46 in a direction parallel to the closing direction 20. The dome shape 42 provides the maximum wall thickness 46. In contrast to the dome shape 42, the receiving recess 24 of the lift valve core 12 forms a tubular shape 48. The tubular shape 48 protrudes from the disc-shaped region 44 of the lift valve core 12 in a direction opposite to the closing direction 20. The tubular shape 48 is designed to enclose the valve stem 10. The tubular shape 48 provides support for the valve stem 10 and limits the maximum tilt angle 96. If the valve stem 24 is pulled in the opposite direction to the closing direction 20 in the absence of the return spring 60, the valve stem 24 will be pulled out of the receiving recess 24 without any effort.

[0046] At least a portion of the return spring 60 surrounds the outer side 62 of the receiving recess 60. The portion of the return spring 60 surrounding the outer side 62 of the receiving recess 24 also surrounds the end 26 of the valve stem 10. Figure 1a and 1b In this example, the outer diameter 64 of the return spring 60 corresponds to approximately 45% of the sealing diameter 40 of the sealing surface 14 at the end 66 of the return spring 60 facing the lift valve core 12. Typically, the outer diameter 64 corresponds to at least 25% of the sealing diameter 40 of the sealing surface 14 to provide sufficient stability.

[0047] exist Figure 1a and 1bIn the example, the distance 36 between the sealing surface 14 of the lift valve core 12 and the front end 22 of the valve stem 10, measured parallel to the closing direction 20, is greater than 50% of the maximum diameter 38 of the valve stem 10. Typically, the distance 36 between the sealing surface 14 and the front end 22 is greater than 30% of the maximum diameter 38 of the valve stem 10. Figure 1a and 1b In the example, the distance 36 between the sealing surface 14 of the lift valve core 12 and the front end 22 of the valve stem 10, measured parallel to the closing direction 20, is greater than 7.5% of the sealing diameter 40 of the sealing surface 14. Typically, the distance 36 between the sealing surface 14 and the front end 22 is greater than 7.5% of the sealing diameter 40 of the sealing surface 14.

[0048] Figure 2 A schematic flowchart of a method for improving the sealing efficiency of a lift valve is shown. In at least one method step 100, a lift valve core 12 is connected to a separately formed valve stem 10 in a manner that allows limited angular movement of the valve stem 10 relative to the sealing surface 24 of the lift valve core 12. To achieve tiltability, in method step 100, the valve stem 10 is inserted into a receiving recess 24 of the lift valve core 12 via a clearance fit, which allows the valve stem 10 to move within the receiving recess 24. To prevent the lift valve core 12 from dislodging from the valve stem 10 during method step 100, the lift valve core 12 is pushed from below towards the valve stem 12 by a return spring 60.

[0049] Reference symbols:

[0050] 10 valve stem

[0051] 12 lift valve core

[0052] 14 Sealing Surface

[0053] 16 Imaginary Lines

[0054] 18. Vertical direction

[0055] 20 Closed Direction

[0056] 22 front-end

[0057] 24 Receiving Recess

[0058] 26 end

[0059] 28 Inner Wall

[0060] 30 opening

[0061] 32 bottom

[0062] 34 inner diameter

[0063] 36 distance

[0064] 38 Maximum diameter

[0065] 40 sealing diameter

[0066] 42 Dome shape

[0067] 44 disc-shaped areas

[0068] 46 Maximum wall thickness

[0069] 48 tubular

[0070] 50 Magnetic Actuator System

[0071] 52 valve seat

[0072] 54 Magnetic Anchors

[0073] 56 backend

[0074] 58 Reset Unit

[0075] 60 return spring

[0076] 62 outer side

[0077] 64 spring outer diameter

[0078] 66 end

[0079] 68 tank ventilation solenoid valves and / or tank purification solenoid valves

[0080] 70 lift valve device

[0081] 72 flow path

[0082] 74 main bodies

[0083] 76 areas

[0084] 78 Lower Housing

[0085] 80 entrances

[0086] 82 exports

[0087] 84 magnetic coil

[0088] 86 Receiving Recess

[0089] 88 Upper Shell

[0090] 90-inch wall shelf

[0091] 92 Inner Wall

[0092] 94 end

[0093] 96 tilt angle

[0094] 98 range

[0095] 100 methods and steps

Claims

1. A lifting valve device, comprising: valve stem, The valve core has a sealing surface and is formed separately from the valve stem. The lift valve is actuated via the valve stem. The lift valve core may be tilted relative to the valve stem and / or the valve stem may be tilted relative to the lift valve core. in, The lift valve core is provided with a receiving recess for insertion into the end of the valve stem. The valve stem and the lifting valve core are connected by a clearance fit. The imaginary line, following the closing direction of the lifting valve core and parallel to the longitudinal direction of the valve stem, passes through the sealing surface before passing the front end of the valve stem. Wherein, the inner diameter of the receiving recess is larger at the opening of the receiving recess than at the bottom of the receiving recess, and The inner diameter of the receiving recess gradually increases from the bottom of the receiving recess toward the opening of the receiving recess.

2. The lifting valve device according to claim 1, wherein, The distance between the sealing surface of the lifting valve core and the front end of the valve stem, measured parallel to the closing direction, is greater than 30% of the maximum diameter of the valve stem.

3. The lifting valve device according to claim 1, wherein, The distance between the sealing surface of the lifting valve core and the front end of the valve stem, measured parallel to the closing direction, is greater than 5% of the sealing diameter of the sealing surface.

4. The lifting valve device according to claim 1, wherein, The receiving recess completely surrounds the end of the valve stem.

5. The lifting valve device according to claim 1, wherein, The receiving recess of the lift valve is formed into a dome shape, which protrudes from the disc-shaped region of the lift valve core in the closing direction.

6. The lifting valve device according to claim 5, wherein, The receiving recess has its maximum wall thickness in a direction parallel to the closing direction.

7. The lifting valve device according to claim 1, wherein, The receiving recess of the lift valve core is formed into a tube, which protrudes from the disc-shaped region of the lift valve in a direction opposite to the closing direction.

8. The lift valve device of claim 1, further comprising a magnetic actuator system that generates movement of the valve stem along and / or against the closing direction.

9. The lifting valve device according to claim 8, wherein, When energized, the magnetic actuator system generates a force that pushes the valve stem toward the lifting valve core, which in turn pushes toward or away from the valve seat, thereby pressing the sealing surface onto or removing the sealing surface from the valve seat.

10. The lift valve device of claim 8, wherein the magnetic actuator system includes a magnetic anchor connected to the rear end of the valve stem.

11. The lift valve device according to claim 1, comprising a reset unit for resetting the lift valve to an initial position.

12. The lifting valve device according to claim 11, wherein the lifting valve device is normally open or normally closed.

13. The lifting valve device according to claim 11, wherein, The reset unit is implemented as a reset spring, which is supported at the lift valve.

14. The lifting valve device according to claim 13, wherein, The lift valve core provides a receiving recess for insertion into the end of the valve stem, and at least a portion of the return spring surrounds the outside of the receiving recess and surrounds the end of the valve stem.

15. The lifting valve device according to claim 13, wherein, The outer diameter of the return spring at the end of the return spring facing the lifting valve core corresponds to at least one-quarter of the sealing diameter of the sealing surface.

16. The lifting valve device according to claim 11, wherein, The reset unit maintains the relative longitudinal position of the valve stem with respect to the lifting valve core.

17. A tank ventilation solenoid valve and / or a tank purification solenoid valve, comprising the lifting valve device according to claim 1.

18. The tank ventilation solenoid valve and / or tank purification solenoid valve according to claim 17, wherein, The lift valve device is used to controllably block or open the flow path between the filter medium and the carbon canister.

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