Fuel supply valve

Abstract

A fuel supply valve for supplying fuel from a fuel tank to a fuel cell stack comprises: a plunger having a cavity therein; a core portion arranged on the plunger; and a blocking portion arranged in the cavity to maintain airtightness between the core portion and the plunger, and a space in which the airtightness of the cavity is maintained by the plunger, the core portion and the blocking portion is defined as a pressure chamber.

Description

Technical Field

[0001] The present invention relates to a fuel supply valve in which a pressure chamber is defined within a plunger. Background Art

[0002] Typically, a fuel cell system is constructed to include: a fuel cell stack for generating electrical energy, a fuel supply system for supplying fuel (hydrogen) to the fuel cell stack, an air supply system for supplying oxygen in the air to the fuel cell stack (oxygen is an essential oxidant for electrochemical reactions), a heat and water management system for controlling the operating temperature of the fuel cell stack, etc.

[0003] In the fuel supply system, i.e., in the hydrogen tank of the hydrogen supply system, high-pressure compressed hydrogen of about 700 bar is stored, and according to the opening / closing of the pressure regulator installed on the air inlet of the hydrogen tank, the stored compressed hydrogen is discharged into the high-pressure pipeline and then decompressed through the start-up valve and the hydrogen supply valve to be supplied to the fuel cell stack.

[0004] That is, in the related art, the hydrogen in the high-pressure hydrogen tank of about 700 bar is first decompressed by a high-pressure regulator, and then the hydrogen is decompressed by a hydrogen supply valve or an injector, and then the hydrogen is supplied to the fuel cell stack. When the secondary decompression is performed by using the hydrogen supply valve in the fuel cell system, the hydrogen airtightness is ensured by the starter valve, and at the same time, the hydrogen flow rate is accurately controlled by the hydrogen supply valve.

[0005] However, there is a disadvantage in that when the cross-sectional area of ​​the pressure chamber through which the hydrogen flows is much wider than the entire cross-sectional area of ​​the hydrogen supply valve, overshoot may occur when the valve is initially opened.

[0006] The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. Summary of the invention

[0007] An object of the present invention is to provide a proportional control valve type fuel supply valve which can easily maintain airtightness even under high pressure, and substantially prevent overshoot from occurring when the valve is opened, and adjust its opening degree according to input current.

[0008] Another object of the present invention is to provide a fuel supply valve wherein a pressure chamber is defined within a plunger.

[0009] A fuel supply valve for supplying fuel from a fuel tank to a fuel cell stack, the fuel supply valve being used in a normally closed state as a proportional control valve for adjusting the valve opening according to the amount of input current, comprising: a plunger having a cavity therein, a core portion arranged on the plunger, and a blocking portion arranged in the cavity to maintain airtightness between the core portion and the plunger, and a space in which the airtightness of the cavity is maintained by the plunger, the core portion and the blocking portion is defined as a pressure chamber.

[0010] According to an embodiment, the core has an extension portion inserted into the cavity of the plunger, the blocking portion is provided between the extension portion and the plunger, and the extension portion transmits the magnetic force to the plunger.

[0011] According to an embodiment, the extension portion has a cylindrical shape having a curved outer surface, and the blocking portion is provided in a recess of the extension portion to maintain airtightness between the extension portion and the plunger.

[0012] According to an embodiment, the fuel supply valve further includes a chamber guide inserted into the cavity of the plunger and connected with the core, and the blocking portion is provided between the chamber guide and the plunger.

[0013] According to an embodiment, the fuel supply valve further includes a spring disposed in the pressure chamber to connect the plunger with the chamber guide.

[0014] According to an embodiment, the pressure chamber is connected with an internal flow path which passes through a gas-tight member provided at a lower portion of the plunger, and the internal flow path is opened by lifting the plunger to discharge the gas in the pressure chamber.

[0015] According to an embodiment, the fuel supply valve further includes a valve body disposed on a lower portion of the airtight member, and the valve body includes a seat portion contacting the airtight member through movement of the plunger, and the seat portion blocks the gas in the pressure chamber from being discharged by contacting the airtight component.

[0016] According to an embodiment, the seat comprises an inner space through which the gas flows, and the length of the inner space is equal to the length of the pressure chamber in a direction perpendicular to a direction from the seat toward the pressure chamber.

[0017] According to an embodiment, the cross-sectional area opened by the inner space is equal to the cross-sectional area of ​​the pressure chamber.

[0018] According to an embodiment, the seat comprises an inner space through which gas flows and further comprises an intermediate flow path for connecting the inner space with a fuel inlet for supplying fuel from the fuel tank, the intermediate flow path having a diameter equal to the diameter of the pressure chamber.

[0019] According to an embodiment, the plunger moves in a first direction flowing from the seat toward the pressure chamber to open an internal flow path, and when the internal flow path is opened, the force applied to the plunger in the first direction by the gas flowing in through the intermediate flow path is offset by the force applied to the plunger in a second direction by the gas flowing in the pressure chamber, the second direction being a direction opposite to the first direction.

[0020] According to an embodiment, the fuel supply valve further includes an airtight member fixing portion symmetrically arranged with respect to the internal flow path, and an open area arranged on the airtight member fixing portion has a horizontal cross-sectional area greater than a cross-sectional area of ​​the pressure chamber, thereby setting the internal flow path.

[0021] According to an embodiment, the fuel supply valve further includes a porous member disposed in the pressure chamber, and the porous member is disposed at a lower portion of the pressure chamber adjacent to the internal flow path.

[0022] According to an embodiment of the present invention, when the pressure of the gas applied to the inlet end of the valve causes the force of the plunger to rise and the force of the internal pressure of the pressure chamber to press the plunger to cancel each other out and no current is applied to the valve solenoid, the force of the spring required to maintain airtightness can be kept small, thereby reducing the magnetic force required to overcome the spring force and lift the plunger, thereby maintaining airtightness under high pressure even when the coil size is reduced. In addition, since a part of the core is inserted into the cavity formed in the plunger, the effect of transmitting the magnetic force from the core to the plunger can be improved. Therefore, a relatively small-sized coil can be applied to the valve, thereby realizing the miniaturization of the fuel supply valve.

[0023] According to the embodiment of the present invention, the airtightness between the extension part provided in the plunger and the plunger can be maintained, thereby defining a pressure chamber. Therefore, the airtightness between the extension part and the plunger can be easily maintained.

[0024] According to the embodiments of the present invention, the length of the internal flow path for connecting the pressure chamber and the seat portion can be minimized, thereby enhancing the workability of the plunger and the airtight member.

[0025] According to an embodiment of the present invention, the plunger moves according to the correlation of the force generated by the spring and the magnetic force, regardless of the pressure that may be generated in the gas. Therefore, the relationship of the forces acting on the fuel supply valve before or after the fuel supply valve is opened is the same. In addition, the volume of the pressure chamber can be minimized, thereby minimizing overshoot that may occur due to a change in the balance relationship between the pressure when the fuel supply valve is opened and the sudden flow of the internal gas.

[0026] The above and other features of the invention are discussed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other features of the present invention will now be described in detail with reference to certain exemplary embodiments of the invention, which are shown in the accompanying drawings, which are given hereinafter only by way of illustration and therefore do not limit the invention, and in which:

[0028] Figure 1 is a diagram showing the configuration of a fuel cell system according to an embodiment of the present invention.

[0029] Figure 2 is a cross-sectional view showing a state in which the fuel supply valve according to the embodiment of the present invention has been closed.

[0030] Figure 3 is a cross-sectional view showing a state in which the fuel supply valve according to the embodiment of the present invention has been opened.

[0031] Figure 4 It is used to illustrate Figure 2 Diagram of the seat.

[0032] Figure 5 is a diagram illustrating a blocking portion according to an embodiment of the present invention.

[0033] Figure 6 is a diagram showing a fuel supply valve according to another embodiment of the present invention.

[0034] Figure 7 is a diagram showing a fuel supply valve according to still another embodiment of the present invention.

[0035] It should be understood that the accompanying drawings are not necessarily drawn to scale, and that they present a somewhat simplified representation of various preferred features illustrating the basic principles of the invention. Specific design features of the invention as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by specific intended applications and use environments.

[0036] In the drawings, like reference numerals refer to the same or equivalent parts of the present invention throughout the several figures of the drawings. DETAILED DESCRIPTION

[0037] It should be understood that the term "vehicle" or "vehicle-mounted" or other similar terms used herein include general motor vehicles, such as passenger cars including sports utility vehicles (SUVs), buses, trucks, various commercial vehicles, watercraft including various ships, boats, aircraft, etc., and include hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g., fuels obtained from resources other than petroleum). As mentioned herein, a hybrid vehicle is a vehicle having two or more power sources, such as a vehicle having both gasoline power and electric power.

[0038] The terms used herein are only for the purpose of describing a specific embodiment and are not intended to limit the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms "one" and "the" are also intended to include plural forms. It will be further understood that when used in this specification, the terms "comprising" and / or "including" specify the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or their combinations. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Throughout the specification, unless explicitly described to the contrary, the word "including" and variants such as "including" or "including" will be understood to imply the inclusion of the stated elements, rather than excluding any other elements. In addition, the terms "unit", "... piece", "... device" and "module" described in the specification refer to units for processing at least one function and operation, and can be implemented by hardware components or software components and combinations thereof.

[0039] In addition, the control logic of the present invention may be implemented as a non-transitory computer-readable medium on a computer-readable medium containing executable program instructions executed by a processor, controller, etc. Examples of computer-readable media include, but are not limited to, ROM, RAM, compact disk (CD)-ROM, magnetic tape, floppy disk, flash drive, smart card, and optical data storage device. The computer-readable medium may also be distributed in a network-coupled computer system so that the computer-readable medium is stored and executed in a distributed manner, for example, by a telematics server or a controller area network (CAN).

[0040] With attached Figure 1 The advantages and features of the present invention and methods for achieving them will become apparent with reference to the embodiments described in detail below. However, the present invention can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein, but rather, these embodiments are provided so that the present invention will be sufficient and complete and will fully convey the scope of the present invention to those skilled in the art to which the present invention belongs, and the present invention is limited only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same elements.

[0041] In addition, in the present specification, the names of components are classified into first, second, etc. in order to distinguish the names of components from each other in the same relationship, and the order thereof is not necessarily limited in the following description.

[0042] The specific embodiments illustrate the present invention. In addition, the foregoing is intended to illustrate and explain the preferred embodiments of the present invention, and the present invention can be used in various other combinations, variations and environments. That is, it can be changed or modified within the scope of the concept of the present invention described in this specification, within the scope equivalent to the scope of the present invention and / or the technology and knowledge in the art. The described embodiments are intended to show the best mode for implementing the technical spirit of the present invention, and various changes can also be made in the specific application and use of the present invention. Therefore, the above-disclosed detailed description is not intended to limit the present invention to the disclosed embodiments. In addition, it should be interpreted that the attached claims are also intended to cover such other embodiments.

[0043] Figure 1 is a diagram showing the configuration of a fuel cell system according to an embodiment of the present invention.

[0044] refer to Figure 1 , a high-pressure fuel tank may be present in the fuel supply device of the fuel cell system. The high-pressure fuel tank preferably uses hydrogen as fuel, and a maximum of about 700 bar to 875 bar of high-pressure hydrogen is stored in the tank as fuel. Since the high-pressure fuel cannot be directly supplied to the fuel cell stack, the high-pressure fuel is decompressed by a high-pressure regulator and a valve, and then supplied to the fuel cell stack. It can first be decompressed to a pressure of preferably 30 bar or less by a high-pressure regulator. The decompressed fuel can be decompressed for a second time by using a valve or an injector. It can preferably be decompressed to a pressure of 4 bar or less. If a valve is used instead of an injector for secondary decompression, the valve should have a fuel air tightness that resists a pressure of about 20 bar, and in addition, the fuel flow in the valve needs to be accurately controlled. The fuel cell system according to an embodiment of the present invention can ensure fuel air tightness and achieve accurate control of fuel flow by using only a single fuel supply valve.

[0045] Figure 2 is a cross-sectional view showing a state in which the fuel supply valve according to the embodiment of the present invention has been closed.

[0046] refer to Figure 2 The fuel supply valve 1 may include a housing 100 , a plunger 200 , a core 300 , a blocking portion 400 , a yoke 500 , an airtight member 600 , a spring 700 , and a valve body 800 . The plunger 200 , the core 300 , the blocking portion 400 , and the yoke 500 may be disposed within the housing 100 .

[0047] The plunger 200 may be a structure that can move in the vertical direction within the housing 100. The flow of fuel (e.g., hydrogen) from the fuel tank to the fuel cell stack may be controlled by the movement of the plunger 200. The plunger 200 may have a cavity therein. The cavity may be airtight by the plunger 200 and the core 300 described later, and the space for maintaining airtightness may be defined as a pressure chamber 250. The plunger 200 may be made of a magnetic material.

[0048] The pressure chamber 250 may be connected with the internal flow path 255 to communicate with the fuel inlet 10 for supplying fuel from the fuel tank and the fuel outlet 50 for supplying fuel to the fuel cell stack. The internal flow path 255 may be connected with the intermediate flow path 30 connected with the fuel inlet 10.

[0049] The core 300 may be provided on the plunger 200 to contact the plunger 200. The core 300 may be made of a magnetic material. The coil 350 may be wound around the core 300. When power is applied to the coil 350 to open the fuel supply valve 1, the core 300 and the plunger 200 may be magnetized by the magnetic force generated from the coil 350, and the magnetized core 300 may pull the plunger 200. That is, the plunger 200 may be lifted in the vertical direction by the magnetic force to open the fuel supply valve 1.

[0050] The core 300 may include an extension 305 inserted into the cavity of the plunger 200. The extension 305 may have a cylindrical shape with a curved outer surface. For example, the outer surface of the extension 305 may have a shape with recesses continuously provided thereon. The extension 305 may be inserted into the cavity to increase the effect of transmitting the magnetic force to the plunger 200. That is, the case where the extension 305 is inserted into the plunger 200 may have a better efficiency in transmitting the magnetic force than the case where the core 300 is provided on the plunger 200 and the plunger 200 and the core 300 are in surface contact therebetween. In addition, since the magnetic force can be effectively transmitted through the extension 305 using a smaller coil 350, the size of the fuel supply valve 1 can be reduced.

[0051] The blocking portion 400 may be disposed between the plunger 200 and the core 300 to maintain the airtightness of the cavity of the plunger 200. For example, the blocking portion 400 may include an O-ring gasket and a rubber gasket. The blocking portion 400 may have a wedge shape. Specifically, the blocking portion 400 may be disposed between the extension 305 and the plunger 200. In addition, the blocking portion 400 may be disposed in a recess formed in the extension 305. The core 300 and the blocking portion 400 may form a pressure chamber 250 by maintaining the airtightness of the cavity of the plunger 200.

[0052] The first guide ring 450 may be disposed between the plunger 200 and the core 300. The first guide ring 450 may guide a path through which the applied lubricant flows to minimize friction between the plunger 200 and the extension 305.

[0053] The second guide ring 460 may be disposed between the plunger 200 and the yoke 500 surrounding the plunger 200. That is, the yoke 500 has a structure having a cavity therein, and the plunger 200 may be inserted into the cavity of the yoke 500. That is, the plunger 200 may move within the yoke 500. The yoke 500 may be made of a magnetic material. When the plunger 200 is lifted or lowered, the second guide ring 460 may prevent the plunger 200 from being excessively tilted in the horizontal direction. The blocking portion 400 may be uniformly expanded or contracted in the radial direction by the second guide ring 460.

[0054] The core guide 550 surrounding the yoke 500 may be disposed on the outer surface of the yoke 500. The core guide 550 may be disposed between the yoke 500 and the coil 350. The core guide 550 may be made of a non-magnetic material. The core 300 may be disposed on the core guide 500.

[0055] The airtight member 600 may be disposed on the lower portion of the housing 100. The airtight member 600 may be a structure in contact with the lower portion of the plunger 200. The airtight member 600 may be in contact with the seat 850, which is a structure of the valve body 800 described later. The internal flow path 255 may be connected to the intermediate flow path 30 by penetrating the airtight member 600. The airtight member 600 may be in close contact with the plunger 200. In particular, the airtight member 600 may be in contact with the seat 850 by lifting or lowering the plunger 200 to open or close the internal flow path 255. The protrusion 610 may be formed at a point on the surface where the plunger 200 and the airtight member 600 contact each other. The cross-sectional shape of the protrusion 610 may be formed to have a polygonal shape, such as a circle or a triangle. The protrusion 610 may allow the plunger 200 and the airtight member 600 to easily engage with each other, thereby preventing the fuel from leaking through the interface between the plunger 200 and the airtight member 600.

[0056] An airtight member fixing portion 650 may be provided for surrounding the outer surface of the region where the plunger 200 and the airtight member 600 contact each other. The airtight member fixing portion 650 may structurally protect the plunger 200 by surrounding the side of the plunger 200, the outside of the airtight member 600, and the lower end of the plunger 200. However, in this case, since the airtight member fixing portion 650 should not close the point where the internal flow path 255 is provided, the airtight member fixing portion 650 may be formed in an L-shape that is symmetrical with respect to the internal flow path 255. The airtight member fixing portion 650 may be mainly used to absorb impact that may be caused by lifting or lowering the plunger 200.

[0057] The spring 700 may connect the yoke 500 with the airtight member fixing part 650. The spring 700 may be used to vertically pull the airtight member fixing part 650 connected to the plunger 200. That is, when the plunger 200 is lifted, the spring 700 may apply a force in a direction opposite to the direction in which the plunger 200 is lifted.

[0058] The valve body 800 may be disposed at the lower portion of the housing 100. The airtight member fixing portion 650 may be disposed on the valve body 800. The seat 850 as a configuration of the valve body 800 may have a shape penetrated by the internal flow path 255. The seat 850 may include an internal space through which gas flows. The seat 850 may contact the airtight member 600 to close the internal flow path 255 by lowering the plunger 200. Conversely, the seat 850 may be separated from the airtight member 600 by lifting the plunger 200 to open the internal flow path 255.

[0059] According to an embodiment of the present invention, the extension 305 may be inserted into the plunger 200 to increase the effect of transmitting the magnetic force. Compared with a valve adopting a structure in which the plunger 200 and the core 300 are in surface contact only between them, the extension 305 improves the efficiency of the magnetic force, so that the piston 200 can move smoothly in the vertical direction even with a smaller coil 350. Therefore, the miniaturization of the fuel supply valve 1 can be achieved.

[0060] According to an embodiment of the present invention, the blocking portion 400 may be provided in the plunger 200 to maintain airtightness between the plunger 200 and the extension portion 305. When compared with a valve adopting a structure in which the plunger 200 and the core portion 300 are in surface contact with each other, the blocking portion 400 may easily maintain airtightness between the plunger 200 and the extension portion 305.

[0061] According to an embodiment of the present invention, the length of the internal flow path 255 for connecting the pressure chamber 250 and the seat 850 can be minimized, thereby enhancing the machinability of the plunger 200 and the airtight member 600. The diameter of the pressure chamber 250 can be relatively larger than the diameter of the internal flow path 255, thereby easily machining the plunger 200. In addition, the diameter of the internal flow path 255 can be minimized to increase the thickness of the plunger 200 and the airtight member 600, thereby enhancing the structural robustness of the fuel supply valve 1.

[0062] Figure 3 2 is a cross-sectional view showing a state in which the fuel supply valve according to an embodiment of the present invention has been opened. Figure 2 Duplicate descriptions will be omitted.

[0063] refer to Figure 3, when current is applied to the coil 350, the core 300 and the plunger 200 are magnetized by the magnetic force generated from the coil 350, and the magnetized core 300 lifts the plunger 200. When the force of the magnetic force pulling the plunger 200 is greater than the sum of the force of the gas in the pressure chamber 250 pressing the plunger 200 and the force of the spring 700, the plunger 200 can be lifted to open the fuel supply valve 1. When the fuel supply valve 1 is opened, the internal flow path 255 and the seat 850 can be separated from each other. Therefore, the gas in the pressure chamber 250 can flow to the fuel outlet 50 through the space below the seat 850 through the internal flow path 255.

[0064] Figure 4 It is used to illustrate Figure 2 Diagram of the seat.

[0065] refer to Figure 2 and Figure 4 , the seat 850 may refer to an area opened by the gas-tight member fixing portion 650. The seat 850 may include an internal space 855 through which the gas flows. The internal flow path 255 may be communicated with the intermediate flow path 30 through the internal space 855. That is, the intermediate flow path 30 may connect the internal space 855 with the fuel inlet 10. The length of the seat 850 may be equal to or less than the length of the pressure chamber 250 in a direction perpendicular to the direction from the seat 850 toward the pressure chamber 250. Specifically, the area of ​​the area opened by the internal space 855 relative to the horizontal direction may be less than or equal to the area opened by the pressure chamber 250. The area opened by the pressure chamber 250 may be represented by the cross-sectional area of ​​the pressure chamber 250. At this time, since the pressure chamber 250 is formed in the plunger 200, the cross-sectional area of ​​the pressure chamber 250 may be kept equal to the internal space 855 even if the size of the plunger 200 increases. In addition, the diameter of the intermediate flow path 30 may be equal to the diameter of the pressure chamber 250. This may mean that the inner space 855 and the intermediate flow path 30 have the same diameter.

[0066] For example, when the plunger 200 is lifted from the seat 850 toward the pressure chamber 250 in the first direction, the internal flow path 255 may be opened. That is, when the plunger 200 is lifted, the fuel supply valve may be opened. When the internal flow path 255 is opened, a first force applied to the plunger 200 in the first direction by the gas flowing in through the intermediate flow path 30 may be substantially equal to or similar to a second force applied to the plunger 200 in the second direction by the gas flowing in the pressure chamber 250, the second direction being the opposite direction to the first direction. That is, the first force may be offset by the second force.

[0067] In addition, the airtight member fixing portion 650 symmetrically arranged with respect to the internal flow path 255 may be partially opened to configure the internal flow path 255. The internal flow path 255 and the compressed airtight member 600 may be disposed in the area opened by the airtight member fixing portion 650. At this time, the open area disposed on the airtight member fixing portion 650 may have a cross-sectional area greater than that of the pressure chamber 250 in the horizontal direction.

[0068] The fuel supply valve 1 according to the embodiment of the present invention can improve the problem that the force of the pressure chamber 250 pressing the plunger 200 becomes too large due to the area difference between the pressure chamber 250 and the seat 850 when high-pressure fuel is supplied from the fuel tank. In the state where the fuel supply valve 1 is closed, the plunger 200 and the airtight member 600 can be pressed by the force F generated by the pressure applied to the cross section B. B (F B =P B *A B , P B represents the pressure applied to cross section B, A B represents the area of ​​the cross section B), the force F of the spring 700 pulling the plunger 200 S , and the force F of lifting the plunger 200 generated by the pressure applied to the cross section A A (F A =P A *A A , P A represents the pressure applied to the cross section A, A A The sum of the area of ​​the cross-section A (denoting the area of ​​the cross-section A) is used to press the seat 850. Therefore, the airtight member 600 can be deformed and contact the surface of the seat 850, thereby maintaining airtightness. Since the pressure chamber 250 is formed in the plunger 200, the cross-sectional area of ​​the pressure chamber 200 can be formed to be similar to or the same as the cross-sectional area of ​​the seat 850 (or the open area of ​​the internal space 855) even if the size of the plunger 200 is increased.

[0069] When power is applied to the coil 350 to open the fuel supply valve 1, the core 300 and the plunger 200 are magnetized by the magnetic force generated from the coil 350, and the magnetized core 300 lifts the plunger 200. When the force pulling the plunger 200 by the magnetic force is greater than the pressure (P B ) generated force (F B ) and the force generated by the spring 700 (F S), the plunger 200 is lifted to open the fuel supply valve 1. At this time, the gas in the pressure chamber 250 flows to the outside of the pressure chamber 250 through the plunger 200 and the internal flow path 255, and at this time, the plunger 200 moves due to the sum of the force of the spring 700 and the magnetic force. Since the cross-sectional area of ​​the pressure chamber 250 is similar to the cross-sectional area of ​​the valve seat portion 850, F B Equal to or similar to F A , and F B and F A offset each other, so that the plunger 200 is S ) and the magnetic force, regardless of the pressure that may be generated in the gas. Therefore, the relationship of the forces acting on the fuel supply valve 1 before or after the fuel supply valve 1 is opened can be the same, thereby minimizing overshoot that may occur when the fuel supply valve 1 is opened.

[0070] Figure 5 is a diagram showing a blocking portion according to an embodiment of the present invention.

[0071] refer to Figure 5 , the blocking portion 400 may be provided between the plunger 200 and the extension portion 305 as a configuration of the core 300. When high-pressure fuel is supplied from the fuel tank, the pressure of the supplied fuel is applied to the pressure chamber 250, and the pressure of the fuel applied to the inner side of the pressure chamber 250 may act on the blocking portion 400. When pressure is applied in the lifting direction of the plunger 200, the blocking portion 400 may expand in the horizontal direction. Therefore, the friction between the core 300 and the plunger 200 may be increased by the expanded blocking portion 400, thereby substantially restricting the movement of the plunger 200. That is, the airtightness between the core 300 and the plunger 200 may be maintained by the blocking portion 400.

[0072] Figure 6 1 is a diagram showing a fuel supply valve according to another embodiment of the present invention. Figure 2 Duplicate descriptions will be omitted.

[0073] refer to Figure 6, a porous member 900 may be provided in the pressure chamber 250. The porous member 900 may be any one of a sponge, a sintered filter, and the like. When the fuel supply valve 2 is opened, the porous member 900 may reduce the internal volume of the pressure chamber 250 to reduce the amount of gas flowing inside the pressure chamber 250, thereby reducing overshoot. In addition, the porous member 900 may prevent the lubricant (lubricating oil) applied to the blocking portion 400 from flowing into the internal flow path 255 when disengaged. Specifically, the lubricant may move due to the flow of gas and may be first captured by the first guide ring 450. The lubricant moved to the lower part of the pressure chamber 250 does not pass through the internal flow path 255 for connecting the pressure chamber 250 and the seat 850, and may be captured on the wall surface of the pressure chamber 250. The fuel supply valve 2 according to an embodiment of the present invention may include a porous member 900 provided on the lower part of the pressure chamber 250 adjacent to the internal flow path 255 to capture foreign matter moved to the lower part of the pressure chamber 250. Therefore, foreign matter cannot flow into the internal flow path 255, and the cleanliness of the gas flowing into the fuel cell stack can be ensured.

[0074] Figure 7 1 is a diagram showing a fuel supply valve according to another embodiment of the present invention. Figure 2 The same description will be omitted.

[0075] refer to Figure 7 , the fuel supply valve 3 may be provided with a spring 750 in the pressure chamber 250, and a chamber guide 360 ​​inserted into the cavity of the plunger 200. The spring 750 may connect the bottom surface of the pressure chamber 250 with the chamber guide 360. The chamber guide 360 ​​is a configuration connected to the core 300 to be inserted into the plunger 200, and the pressure chamber 250 may be defined by the chamber guide 360, the blocking portion 400, and the plunger 200.

[0076] According to an embodiment of the present invention, the spring 750 may be disposed in the pressure chamber 250 rather than on the path through which the gas flows, thereby minimizing the interference of the spring 750 with the gas flow.

[0077] According to an embodiment of the present invention, the chamber guide 360 ​​and the core 300 may be formed separately rather than integrally molded. In this case, the processability of the core 300 may be enhanced, and the materials of the chamber guide 360 ​​and the core 300 may be manufactured separately. For example, the core 300 may be made of a magnetic material, and the chamber guide 360 ​​may be made of a non-magnetic material.

[0078] As described above, although the embodiments of the present invention have been described with reference to the accompanying drawings, it will be understood by those skilled in the art that other specific forms can be implemented without changing the technical spirit or its basic features. Therefore, it should be understood that the above embodiments are illustrative and not restrictive in all aspects.

Claims

1. A fuel supply valve for supplying fuel from a fuel tank to a fuel cell stack, the fuel supply valve comprising: a plunger having a cavity therein; a core, the core being disposed on the plunger; a blocking portion, disposed in the cavity to maintain air tightness between the core and the plunger; and A valve body is provided at the lower part of the airtight member, wherein a space in which the airtightness of the cavity is maintained by the plunger, the core and the blocking portion is defined as a pressure chamber, wherein the pressure chamber is connected to an internal flow path passing through the airtight member provided at the lower portion of the plunger, and wherein the internal flow path is opened by lifting the plunger to discharge the gas in the pressure chamber, wherein the valve body includes a seat portion that contacts the airtight member through movement of the plunger, and the seat portion blocks the gas in the pressure chamber from being discharged by contacting the airtight member, wherein the diameter of all parts of the internal flow path is smaller than the diameter of the pressure chamber, wherein the seat comprises an inner space through which gas flows, and The cross-sectional area opened by the inner space is equal to the cross-sectional area of ​​the pressure chamber.

2. The fuel supply valve according to claim 1, in, The core has an extension that is inserted into the cavity of the plunger, wherein the blocking portion is disposed between the extending portion and the plunger, and Wherein, the extension portion transmits magnetic force to the plunger.

3. The fuel supply valve according to claim 2, in, The blocking portion is disposed in the recess of the extending portion to maintain airtightness between the extending portion and the plunger.

4. The fuel supply valve according to claim 1, further comprising a chamber guide inserted into the cavity of the plunger and connected to the core, in, The blocking portion is disposed between the chamber guide and the plunger. 5 . The fuel supply valve according to claim 4 , further comprising a spring disposed in the pressure chamber to connect the plunger with the chamber guide.

6. The fuel supply valve according to claim 1, in, The length of the internal space is equal to the length of the pressure chamber in a direction perpendicular to a direction from the seat toward the pressure chamber.

7. The fuel supply valve according to claim 1, in, The seat portion includes an inner space through which gas flows, and further includes an intermediate flow path for connecting the inner space with a fuel inlet for supplying fuel from the fuel tank, and Wherein, the diameter of the intermediate flow path is equal to the diameter of the pressure chamber.

8. The fuel supply valve according to claim 7, in, The plunger moves in a first direction from the seat toward the pressure chamber to open the internal flow path, and Wherein, when the internal flow path is opened, the force applied to the plunger in a first direction by the gas flowing in through the intermediate flow path is offset by the force applied to the plunger in a second direction by the gas flowing in the pressure chamber, and the second direction is a direction opposite to the first direction.

9. The fuel supply valve according to claim 1, further comprising an airtight member fixing portion provided symmetrically with respect to the internal flow path, in, The cross-sectional area of ​​the open area provided on the airtight member fixing portion in the horizontal direction is larger than the cross-sectional area of ​​the pressure chamber, thereby providing the internal flow path.

10. The fuel supply valve according to claim 1, further comprising a porous member disposed in the pressure chamber, in, The porous member is disposed at a lower portion of the pressure chamber adjacent to the internal flow path.

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