WO2022234928A1

WO2022234928A1 - Receptacle check valve for refueling hydrogen

Info

Publication number: WO2022234928A1
Application number: PCT/KR2022/001521
Authority: WO
Inventors: 홍성종; 홍진용; 이익희; 박신규; 김치수; 김정권
Original assignee: 남양넥스모 주식회사
Priority date: 2021-05-04
Filing date: 2022-01-27
Publication date: 2022-11-10
Also published as: KR20220150518A; CN217898913U; CN117545651A; KR102651683B1

Abstract

Provided is a receptacle check valve for refueling hydrogen that improves low-pressure airtight performance with a simple structure and reduces noise and deformation due to chattering in a low-pressure section of a hydrogen tank. To this end, the receptacle check valve for refueling hydrogen according to the present invention comprises: a first body having a first internal flow path extending from one end to the other end; a second body having a second internal flow path extending from one end to the other end and having one end that is inserted into the first internal flow path through the other end of the first body to be coupled to the first body; a sealing member disposed in the first internal flow path to seal between the inner circumferential surface of the first body and one end of the second body and having a third internal flow path extending from one end to the other end that guides hydrogen introduced into the first internal flow path to the second internal flow path; an elastic member disposed in the second internal flow path; and a valve member supported by the elastic member and movably disposed in the second internal flow path and having a valve portion formed at an end thereof, wherein a valve part is inserted into the third internal flow path through the other end of the sealing member to open and close the third internal flow path.

Description

Receptacle Check Valve for Hydrogen Filling

The present invention relates to a receptacle check valve for hydrogen charging (RECEPTACLE CHECK VALVE FOR REFUELING HYDROGEN), and more particularly, when charging hydrogen in a hydrogen tank of a hydrogen fuel cell vehicle, the pressure of the hydrogen charged in the hydrogen tank is It relates to a receptacle check valve for hydrogen filling that closes when it is reached.

In general, a hydrogen fuel cell vehicle uses electric energy generated by using a chemical reaction between oxygen and hydrogen in a stack as a power source. The hydrogen fuel cell vehicle can continue to generate electricity regardless of the capacity of the battery by supplying fuel and air from the outside, and has the advantage of high efficiency and almost no emission of pollutants. is becoming active

The hydrogen fuel cell vehicle is equipped with one or more hydrogen tanks filled with high-pressure hydrogen gas. In addition, a receptacle check-valve for hydrogen charging is installed in the hydrogen tank of the hydrogen fuel cell vehicle. A charging nozzle connected to the buffer tank of the hydrogen gas charging station may be connected to the receptacle check valve to fill the hydrogen tank with hydrogen.

When the hydrogen tank of the hydrogen fuel cell vehicle is charged with hydrogen, when the pressure of hydrogen charged in the hydrogen tank becomes a buffer pressure, the receptacle check valve is closed by the hydrogen pressure of the hydrogen tank, so that the filling of the hydrogen tank is completed do.

On the other hand, when the hydrogen tank is filled with hydrogen, in the pressure zone where the receptacle check valve starts to open, the receptacle check valve repeatedly opens and closes while the sound of hitting the internal valve part is repeatedly generated. occurs

Since the receptacle check valve is classified as a very important quality item in terms of noise as well as airtightness during charging, the technology for preventing the chattering is also an important matter.

Republic of Korea Patent Publication No. 10-1987459 (published on September 30, 2019) (hereinafter referred to as 'prior art') discloses a 'receptacle for a hydrogen fuel cell vehicle', which is the receptacle check valve.

In the prior art, in order to prevent the chattering, the first and second seats are installed between the sealing member and the valve body. The prior art receptacle is opened and closed by an operation of opening and closing the flow paths of the first and second seats while the valve body is raised and lowered.

However, in the prior art, the first and second sheets must be provided to prevent the chattering, so that the structure is complicated.

It is an object of the present invention to provide a receptacle check valve for charging hydrogen that improves low-pressure airtight performance with a simple structure and reduces noise and deformation due to chattering in a low-pressure section of a hydrogen tank.

The technical problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the receptacle check valve for hydrogen charging according to the present invention is composed of a first body, a second body, a sealing member, an elastic member and a valve member. A first internal flow path extending from one end of the first body to the other end of the first body is formed in the first body. A second internal flow path extending from one end of the second body to the other end of the second body is formed in the second body. One end of the second body is inserted into the first internal flow path through the other end of the first body and is coupled to the first body. The sealing member is disposed in the first internal flow path to seal between the inner circumferential surface of the first body and one end of the second body. A third internal flow path for guiding hydrogen introduced into the first internal flow path to the second internal flow path is formed in the sealing member. The third internal flow passage is formed to extend from one end of the sealing member to the other end of the sealing member. The elastic member is disposed in the second internal flow path. The valve member is supported by the elastic member and is movably disposed in the second internal flow path. A valve portion is formed at an end of the valve member. The valve part is inserted into the third internal flow path through the other end of the sealing member to open and close the third internal flow path.

A filter may be further disposed in the first internal flow path. The filter may filter out foreign substances from the hydrogen introduced into the first internal flow path. The filter may guide the hydrogen from which the foreign substances have been filtered to the third internal flow path. The sealing member may be coupled to the filter.

The other end of the sealing member may be inserted into the second internal flow path through one end of the second body. A flange may be formed on the outer peripheral surface of the sealing member. The flange may be in contact with one end of the second body to seal between the inner circumferential surface of the first body and one end of the second body.

The inner circumferential surface of the other end of the sealing member into which the valve part is inserted may be formed as an inclined surface in which the diameter of the third internal flow path becomes smaller as it approaches one end of the sealing member. An elastic ring in contact with the inclined surface may be installed in the valve part.

The elastic ring may be in contact with the inclined surface before the valve part when the valve part is inserted into the third internal flow path through the other end of the sealing member.

A coupling groove to which the elastic ring is coupled may be formed in the valve unit. The valve part may be formed with an inclined surface corresponding to the inclined surface of the outer peripheral surface of the end portion disposed on one side of the coupling groove.

The sealing member and the valve member may be formed of steel.

When the hydrogen tank is filled with fuel, a first charging nozzle for charging fuel at a low pressure at one end of the first body, and a second charging nozzle having a smaller diameter than the first charging nozzle and charging fuel at a high pressure One of the nozzles may be coupled. A partition protrusion corresponding to the diameter of the second charging nozzle may be formed on an inner circumferential surface of one end of the first body. A first installation groove may be formed on an inner circumferential surface of the first body disposed on one side of the partition protrusion. A second installation groove having a smaller diameter than the first installation groove may be formed on an inner circumferential surface of the first body disposed on the other side of the partition protrusion. A first sealing ring for sealing the first charging nozzle may be installed in the first installation groove. A second sealing ring sealing the second charging nozzle and having a smaller diameter than the first sealing ring may be installed in the second installation groove.

A first backup ring to assist the sealing force of the second sealing ring may be installed on one side of the second sealing ring in the second installation groove. A second backup ring to assist the sealing force of the second sealing ring may be installed on the other side of the second sealing ring in the second installation groove.

An O-ring for sealing a portion coupled to the hydrogen tank may be installed on the other surface of the second body. A groove into which the O-ring is inserted may be formed in the other surface of the second body.

The details of other embodiments are included in the detailed description and drawings.

In the receptacle check valve for hydrogen charging according to the present invention, since the valve part of the valve member is inserted into the internal flow path of the sealing member to open and close the internal flow path of the sealing member, a seat for sealing between the sealing member and the valve member Since there is no need for installation, there is an effect of simplifying the structure.

In addition, in the receptacle check valve for hydrogen charging according to the present invention, an elastic ring is installed in the valve part, so that the elastic ring is in contact with the inclined surface of the sealing member before the valve part, so that the valve in the low pressure section of the hydrogen tank Since chattering, which repeatedly strikes the inclined surface of the sealing member, is prevented, there is an effect of reducing noise and deformation generated during the chattering.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view showing a receptacle check valve for hydrogen charging according to an embodiment of the present invention;

Figure 2 is an exploded perspective view of Figure 1;

3 is a side cross-sectional view of FIG. 1;

4 is a view showing a state in which the valve part of the valve member shown in FIG. 3 opens the internal flow path of the sealing member;

5 is a view showing a state in which the valve part of the valve member shown in FIG. 3 closes the internal flow path of the sealing member by one stage;

6 is a view showing a state in which the valve unit of the valve member shown in FIG. 3 closes the internal flow path of the sealing member in two stages.

1: Receptacle check valve for hydrogen charging 100: First body

105: first internal flow path 106: first installation groove

107: second installation groove 108: partition projection

110: first sealing ring 120: second sealing ring

130: first backup ring 140: second backup ring

200: second body 205: second internal flow path

300: filter 400: sealing member

405: third internal flow path 410: flange

450: inclined surface 500: elastic member

600: valve member 620: valve part

630: end 650: elastic ring

655: coupling groove

Hereinafter, a receptacle check valve for hydrogen charging according to an embodiment of the present invention will be described with reference to the drawings.

In all configurations described below, the terms top, bottom, top and bottom, which are direction-related terms, mean the directions disclosed in the drawings. Accordingly, the upper end may have the same meaning as one end, the lower end may have the same meaning as the other end, the upper end may have the same meaning as the one side, and the lower end may have the same meaning as the other end.

1 is a perspective view showing a receptacle check valve for charging hydrogen according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is a side cross-sectional view of FIG.

1 to 3 , the receptacle check valve 1 for charging hydrogen according to an embodiment of the present invention includes a first body 100 , a second body 200 , a filter 300 , and a sealing member 400 . ), an elastic member 500 and a valve member 600 may be included.

The first body 100 and the second body 200 may form an external shape of the receptacle check valve 1 . The first body 100 may form an upper external shape of the receptacle check valve 1 , and the second body 200 has an upper end coupled to the lower end of the first body 100 . A lower exterior shape may be formed.

An upper end of the first body 100 may be coupled to a charging nozzle of a hydrogen charging station, and a lower end of the second body 200 may be coupled to a hydrogen tank of a hydrogen fuel cell vehicle. Since the first body 100 and the second body 200 are coupled to each other, the hydrogen introduced into the receptacle check valve 1 from the charging nozzle of the hydrogen charging station through the upper opening of the first body 100 is The hydrogen tank may be filled through the lower opening of the second body 200 .

The first body 100 may be formed in a substantially cylindrical shape in which the upper and lower surfaces are opened. A first internal flow path 105 through which the charged fuel moves may be formed in the first body 100 . The first internal flow path 105 may extend from an upper end to a lower end of the first body 100 . The first internal flow path 105 may mean an internal space of the first body 100 .

Here, a charging nozzle of a hydrogen charging station may be coupled to a portion opened on the upper surface of the first body 100 to form an inlet through which hydrogen is introduced. That is, the upper opening of the first internal flow path 105 may be the inlet through which hydrogen is introduced from the charging nozzle of the hydrogen charging station.

When filling the hydrogen tank with fuel, at the upper end of the first body 100, a first charging nozzle for charging fuel at a low pressure of about 5 bar to 100 bar, and a high pressure of about 100 bar to 700 bar. One of the second charging nozzles for charging may be coupled.

The first sealing ring 110 and the second sealing ring 120 for preventing fuel leakage when the charging nozzle is coupled to the inner circumferential surface of the inlet may be vertically spaced apart by a predetermined interval. That is, the first sealing ring 110 and the second sealing ring 120 may be disposed to be spaced apart from each other in the longitudinal direction of the first internal flow path 105 .

Here, the first sealing ring 110 may function to seal the first charging nozzle, and the second sealing ring 120 may function to seal the second charging nozzle.

The first charging nozzle may have a larger diameter than the second charging nozzle, and the second charging nozzle may have a smaller diameter than the first charging nozzle.

A partition protrusion 108 corresponding to the diameter of the second charging nozzle may be formed on the inner peripheral surface of the upper end of the first body 100 . A first installation groove 106 in which the first sealing ring 110 is installed may be formed on the inner circumferential surface of the first body 100 disposed on the upper side of the partitioning protrusion 108 , and at the lower side of the partitioning projection 108 . A second installation groove 107 in which the second sealing ring 120 is installed may be formed on the inner circumferential surface of the disposed first body 100 . The partitioning protrusion 108 may partition the first installation groove 106 and the second installation groove 107 .

The diameter of the first installation groove 106 may be formed to be larger than the diameter of the second installation groove 107 , and the diameter of the second installation groove 107 may be formed to be smaller than the diameter of the first installation groove 106 . have. The diameter of the first sealing ring 110 may be formed to be larger than the diameter of the second sealing ring 120 , and the diameter of the second sealing ring 120 may be formed to be smaller than the diameter of the first sealing ring 110 . have.

In the second installation groove 107 , the first backup ring 130 may be further installed on the upper side of the second sealing ring 120 , and the second backup ring 140 on the lower side of the second sealing ring 120 . More of this can be installed. The first backup ring 130 and the second backup ring 140 may assist the sealing force of the second sealing ring 120 .

The first backup ring 130 and the second backup ring 140 minimize the movement and deformation of the second sealing ring 120 being pushed upward or downward by the charging pressure of the fuel when the high-pressure fuel of about 100 bar to 700 bar is charged. can function.

The first backup ring 130 and the second backup ring 140 may be formed of a synthetic resin material having excellent low-temperature airtightness, tensile strength and elongation, such as thermoplastic polyurethane (TPU).

The first backup ring 130 and the second backup ring 140 may minimize vertical movement and deformation of the second sealing ring 120 due to the charging pressure when high-pressure hydrogen is charged.

The first sealing ring 110 and the second sealing ring 120 can completely block fuel leakage during hydrogen charging, improve airtight performance, and prevent safety accidents due to fuel leakage in advance.

The second body 200 may be formed in a substantially cylindrical shape in which the upper and lower surfaces are opened. A second internal flow path 205 through which the charged fuel moves may be formed inside the second body 200 . The second internal flow path 205 may extend from an upper end to a lower end of the second body 200 . The second internal flow path 205 may mean an internal space of the second body 200 .

Here, the hydrogen tank may be coupled to the portion opened on the lower surface of the second body 200 to form an outlet through which hydrogen is discharged. That is, the lower opening of the second internal flow path 205 may be the outlet through which hydrogen flows into the hydrogen tank.

The upper end of the second body 200 may have a smaller diameter than the lower end of the first body 100 , and may be inserted into the lower end of the first body 100 to be coupled to the first body 100 . That is, the upper end of the second body 200 may be inserted into the first internal flow path 105 through the lower end of the first body 100 to be coupled to the first body 100 .

An O-ring 210 for sealing a portion coupled to the hydrogen tank may be installed on a lower surface of the second body 200 . The O-ring 210 may be inserted into a groove formed on the lower surface of the second body 200 to be installed on the lower surface of the second body 200 .

The filter 300 may be installed inside the first body 100 . The filter 300 may be disposed in the first internal flow path 105 . The filter 300 may remove foreign substances from hydrogen flowing into the first body 100 . The filter 300 may filter foreign substances from the hydrogen introduced into the first internal flow path 105 , and guide the filtered hydrogen to a third internal flow path 405 of the sealing member 400 to be described later.

The filter 300 includes a sintered filter 310 that is manufactured in a cylindrical shape by overlapping a plurality of wire meshes having different pore diameters and filters the fuel to be filled, and a protector 320 installed inside the sintered filter 310 and , may include a cap 330 coupled to the upper end of the sintered filter 310 and the protector 320 .

For example, the sintered filter 310 overlaps one main mesh having a pore diameter of about 10 μm, two protective meshes having a pore diameter of about 0.1 to 10 mm and a thickness of about 1 to 2 mm to about 1000 to 1200° C. Compression sintering at a high temperature of about 10 μm can be prepared as a single sintered mesh filter having a uniform pore diameter of about 10 μm and a thickness of about 1.3 mm.

As described above, the sintered filter 310 manufactured by overlapping a plurality of wire meshes and compression sintering at a high temperature may have excellent porosity and filtration efficiency, heat resistance and corrosion resistance, and may have excellent strength and durability.

Of course, the sintered filter 310 may be changed to apply a sintered powder filter that is easy to manufacture, simple, and inexpensive instead of the sintered mesh filter.

However, in the sintered powder filter, it is difficult to make a desired pore size uniform because the powders are chemically bonded to each other due to the manufacturing process mechanism. have.

On the other hand, the sintered mesh filter does not break or break due to its characteristics, and can maintain overall rigidity even if partial deformation occurs.

Accordingly, the sintered filter 310 is preferably a sintered mesh filter manufactured by overlapping a plurality of wire meshes manufactured with different pore diameters set in advance and compression sintering at a high temperature, through which the sintered filter 310 has a small pore diameter distribution , the rigidity of the filter according to the hydrogen charging environment can be secured.

In addition, it should be noted that the sintered filter 310 may vary the number of meshes, the pore diameter and thickness of each mesh according to the characteristics and pressure of the fuel to be charged.

The protector 320 may be installed inside the sintered filter 310 to prevent deformation of the sintered filter 310 under high pressure conditions.

The protector 320 may be manufactured to a thickness of about 1 mm. The protector 320 is manufactured to have a pore diameter of about 5 mm, so that hydrogen filtered by the sintered filter 310 can be smoothly guided to the third internal flow path 405 of the sealing member 400 .

The protector 320 may be manufactured from a square plate shape to a cylindrical shape, and then joined at both ends by a welding method such as laser welding.

The cap 330 serves as a guide for guiding the hydrogen flowing into the first internal flow path 105 of the first body 100 to the outside of the sintered filter 310, Hydrogen may be filtered while moving from the outside to the inside of the sintered filter 310 .

To this end, the cap 330 may be formed in a shape such that the central portion is convex upward and inclined downward toward the outside in order to minimize fluid resistance during the movement of fuel, and a protector 320 is provided on the lower surface of the cap 330 . ) may be formed to protrude the insertion part inserted into the interior.

Of course, the shape of the cap 330 is not necessarily limited thereto, and may be changed to various shapes, such as a hemispherical shape convex upwards, or a semi-elliptical shape in cross section.

In this way, the present invention applies a sintered filter 310 that is compressed and sintered at a high temperature by overlapping a plurality of wire mesh, a cap 330 is coupled to the upper portion of the sintered filter 310, and a lower portion of the sintered filter 310 is applied. By combining the sealing member 400 , it is possible to prevent damage to the corners due to hydrogen pressure during hydrogen charging.

Accordingly, according to the present invention, by completely blocking the inflow of foreign substances into the receptacle check valve 1, it is possible to prevent defects of each component due to foreign substances.

Each component of the filter 300 may be made of a stainless steel material containing 7 to 15 wt% of nickel (Ni) in order to respond to hydrogen embrittlement.

Meanwhile, the sealing member 400 may be coupled to the lower end of the filter 300 to be integrally formed with the filter 300 .

The sealing member 400 may be disposed in the first internal flow path 105 of the first body 100 . The sealing member 400 may be formed in a cylindrical shape. A third internal flow path 405 may be formed in the sealing member 400 . The third internal flow path 405 may be formed to extend from the upper end of the sealing member 400 to the lower end of the sealing member 400 . The third internal flow path 405 may mean an internal space of the sealing member 400 .

When the filter 300 is not provided in the first internal flow path 105 of the first body 100 , the third internal flow path 405 of the sealing member 400 is hydrogen introduced into the first internal flow path 105 . may be guided to the second internal flow path 205 of the second body 200 . When the filter 300 is provided in the first internal flow path 105 of the first body 100 , the third internal flow path 405 of the sealing member 400 transfers the hydrogen filtered in the filter 300 to the second body. It can be guided to the second internal flow path 205 of (200).

The sealing member 400 may seal between the inner circumferential surface of the first body 100 and the upper end of the second body 200 . To this end, a flange 410 may be formed on the outer circumferential surface of the sealing member 400 . The flange 410 may be formed continuously in the circumferential direction, and may be formed to protrude in the radial direction. The flange 410 may be in contact with the upper end of the second body 200 to seal between the inner circumferential surface of the first body 100 and the upper end of the second body 200 .

A step 109 may be formed below the filter 300 on the inner peripheral surface of the lower end of the first body 100 . The flange 410 upper surface of the sealing member 400 is in contact with the step 109, the flange 410 lower surface of the sealing member 400 is in contact with the upper surface of the second body 200, the sealing member 400 The flange 410 may seal between the first body 100 and the second body 200 .

The lower end of the sealing member 400 may be inserted into the second internal passage 205 of the second body 200 through the upper end of the second body 200 .

The elastic member 500 may be installed in the second internal flow path 205 of the second body 200 . The elastic member 500 may be a coil spring disposed perpendicular to the second internal flow path 205 to generate an elastic force vertically.

The valve member 600 may be installed in the second internal flow path 205 of the second body 200 . The valve member 600 may prevent a reverse flow of hydrogen introduced into the second body 200 .

The valve member 600 may be supported by the elastic member 500 to be vertically movable in the second internal flow path 205 of the second body 200 .

The valve member 600 normally operates upward by the elastic force of the elastic member 500 to close the third internal flow path 405 of the sealing member 400 , and the hydrogen pressure in the third internal flow path 405 is When rising, the third internal flow path 405 of the sealing member 400 may be opened by performing a descending operation while elastically deforming the elastic member 500 so that the vertical length of the elastic member 500 is reduced.

The valve member 600 may include a cylindrical body portion 610 and a cylindrical valve portion 620 extending upward from the upper side of the body portion 610 and having a smaller diameter than the body portion 610 . The body portion 610 may form a lower portion of the valve member 600 , and the valve portion 620 may form an upper portion of the valve member 600 .

A valve part 620 may be formed at an end of the valve member 600 . The valve unit 620 may be inserted into the third internal flow path 405 of the sealing member 400 through the other end of the sealing member 400 to open and close the third internal flow path 405 .

That is, the valve member 600 may open and close the receptacle check valve 1 while moving up and down. When the valve member 600 slides downward, the receptacle check valve 1 may be opened, and when the valve member 600 slides upward, the receptacle check valve 1 may be closed. When the valve member 600 slides downward to open the receptacle check valve 1 , the hydrogen in the receptacle check valve 1 is filled into the hydrogen tank through the lower opening of the second body 200 . have.

The sealing member 400 and the valve member 600 may be formed of steel. Therefore, when the valve member 600 is moved upward to close the third internal flow path 405 of the sealing member 400 , a hitting sound may be heard when the valve unit 620 collides with the sealing member 400 . In particular, in the low-pressure section where the hydrogen pressure is low, the chattering, which is a phenomenon in which the hitting sound is repeatedly generated as the valve member 600 is repeatedly moved up and down by the hydrogen pressure, may occur.

In order to prevent the chattering, the inner peripheral surface of the lower end of the sealing member 400 into which the valve part 620 is inserted is an inclined surface ( 450 , and an elastic body ring 650 in contact with the inclined surface 450 may be installed in the valve unit 620 .

The elastic ring 650 is on the inclined surface 450 of the sealing member 400 when the valve part 620 is inserted into the third internal flow path 405 of the sealing member 400 through the other end of the sealing member 400. Since it is contacted before the valve part 620, the chattering can be prevented.

A coupling groove 655 to which the elastic ring 650 is coupled may be formed in the valve unit 620 . The coupling groove 655 is formed continuously in the circumferential direction of the valve part 620, the inner portion of the elastic body ring 650 can be inserted into the coupling groove 655, and the outer side of the elastic body ring 650 is a coupling groove ( 655) may be disposed to protrude outward.

An end portion 630 disposed above the coupling groove 655 may be formed at an upper portion of the valve portion 620 . The end portion 630 may be formed to be convex upward.

The valve member 600 may be formed in a hollow portion disposed on the lower side of the coupling groove 655 is opened at the lower side.

The upper end of the elastic member 500 may be inserted into the hollow of the valve member 600 through the lower end of the valve member 600 . The upper end of the elastic member 500 may be in contact with the step of the internal space of the body portion 610 of the valve member 600 . The lower end of the elastic member 500 may contact the internal space of the second body 200 with the step.

The valve unit 620 may be formed with an inclined surface corresponding to the inclined surface 450 of the outer peripheral surface of the end portion 630 of the sealing member (400). Accordingly, when the valve member 600 is in an open state of the third internal flow path 405 of the sealing member 400 , hydrogen in the third internal flow path 405 is formed between the inclined surface 450 of the sealing member 400 and the valve. The end portion 630 of the portion 620 may be smoothly moved to the second internal flow path 205 of the second body 200 through between the outer peripheral surfaces.

The valve member 600 may be formed with a plurality of inlets 625 spaced apart from each other along the periphery on the outer peripheral surface of a portion of the valve unit 620 that is not inserted into the third internal flow path 405 of the sealing member 400 . . A total of four inlets 625 may be formed at intervals of 90 degrees on the outer circumferential surface of the valve part 620 of the valve member 600 . Hydrogen introduced into the upper end of the second internal flow path 205 of the second body 200 is moved from the outside of the valve member 600 to the hollow in the valve member 600 through the plurality of inlets 625, and then the valve Hydrogen may be moved to the lower end of the second internal flow path 205 of the second body 200 through the lower opening of the member 600 , and moved to the lower end of the second internal flow path 205 of the second body 200 . The hydrogen tank may be filled through the lower opening of the second internal flow path 205 of the second body 200 .

Meanwhile, the inclined surface 450 may be formed to have an inclination angle between 90 degrees and 120 degrees in consideration of adhesion to the elastic body ring 650 and the valve member 600 . In addition, the inner diameter of the elastic ring 650 may be formed to be smaller than the outer diameter of the end portion 630 of the valve portion 620 by at least 0.2 mm.

In addition, in order for the elastic ring 650 to contact the inclined surface 450 of the sealing member 400 before the valve part 620 , the outer peripheral surface of the elastic ring 650 has an angle of 0.5 degrees or more than the inclined angle of the inclined surface 450 . It may be formed in a chamfered shape or a convex shape having a radius of curvature of 0.1 mm or more, and the upper edge of the valve unit 620 may be formed in a convex shape having a radius of curvature of 0.1 mm or more.

In addition, when the valve member 600 closes the third internal flow path 405 of the sealing member 400 , the contact cross-sectional area in which the elastic ring 650 is in close contact with the inclined surface 450 may be 0.1 mm 2 or more.

In addition, the outer peripheral surface of the end 630 of the valve part 620 may be formed as an inclined surface having an inclination angle of 60 to 160 degrees for the smooth flow of hydrogen.

The assembling process of the receptacle check valve 1 for hydrogen charging according to an embodiment of the present invention configured as described above will be described as follows. However, the assembly process here is only an example, and the assembly order of some components may be changed.

First, the operator installs the first sealing ring 110 in the first installation groove 106 formed on the inner peripheral surface of the upper end of the first body 100 , and the first backup ring 130 in the second installation groove 107 . , the second sealing ring 120 and the second backup ring 140 are installed.

Thereafter, the operator moves the filter 300 and the sealing member 400 from the lower part of the first body 100 upward in a state in which they are integrally coupled and inserts the filter 300 and the sealing member 400 into the first internal flow path 105 , and the first body 100 . The sealing member 400 is coupled to the lower end of the .

Thereafter, the operator sequentially inserts the elastic member 500 and the valve member 600 into the second internal flow path 205 of the second body 200 to vertically insert the valve member 600 into the second internal flow path 205 . installed so that it can be moved.

Thereafter, by inserting the upper portion of the second body 200 into the first internal flow path 105 through the lower opening of the first body 100, the first body 100 and the second body 200 are coupled to each other, Complete the assembly of the receptacle check valve (1).

The operation of the receptacle check valve 1 according to the embodiment of the present invention configured as described above will be described as follows.

4 is a view showing a state in which the valve part of the valve member shown in FIG. 3 opens the internal flow path of the sealing member, FIG. 5 is a state in which the valve part of the valve member shown in FIG. 3 closes the internal flow path of the sealing member by one stage 6 is a view showing a state in which the valve part of the valve member shown in FIG. 3 closes the internal flow path of the sealing member in two stages.

3 and 4, in order to charge hydrogen in the hydrogen tank of the hydrogen fuel cell vehicle, when the charging nozzle of the hydrogen charging station is connected to the upper end of the first body 100 to start hydrogen charging, the first body ( Hydrogen introduced into the first internal flow path 105 of 100 is introduced into the third internal flow path 405 of the sealing member 400 after passing through the filter 300 .

Hydrogen flowing into the third internal flow path 405 of the sealing member 400 presses the valve part 620 of the valve member 600 downward, and accordingly, the valve member 600 moves downward to seal it. The third internal flow path 405 of the member 400 is opened.

As such, when the valve member 600 opens the third internal flow path 405 of the sealing member 400 , hydrogen in the third internal flow path 405 is converted into the second internal flow path 205 of the second body 200 . After inflow into the hollow of the valve member 600 through a plurality of inlets 625 formed in the valve part 620 of the valve member 600, and then through the open lower end of the valve member 600 After moving to the lower part of the second internal flow path 205 , it is moved to the hydrogen tank through the open lower end of the second body 200 to be filled in the hydrogen tank.

5 and 6, when hydrogen is buffered in the hydrogen tank, the valve member 600 is moved upward by the hydrogen pressure of the hydrogen tank, and through the lower end of the sealing member 400, the third internal flow path ( 405) to close the third internal flow path 405, thereby completing the hydrogen filling in the hydrogen tank. When the valve member 600 is inserted into the third internal flow path 405 of the sealing member 400, , as shown in FIG. 5, the elastic ring 650 first contacts the inclined surface 450 of the sealing member 400, and as shown in FIG. 6, the valve part 620 is the inclined surface of the sealing member 400 ( 450 is contacted later than the elastic ring 650 . In this way, since the sealing member 400 made of steel and the elastic ring 650 made of a material having relatively elasticity than the valve part 620 made of steel first contact the inclined surface 450, the valve part 620 is When in contact with the inclined surface 450, it is possible to reduce the impact and deformation.

As described above, in the receptacle check valve 1 for hydrogen charging according to an embodiment of the present invention, the valve part 620 of the valve member 600 is formed of the sealing member 400 through the lower end of the sealing member 400 . 2 Since it is inserted into the internal flow path 205 to open and close the second internal flow path 205 of the sealing member 400, there is no need to install a seat for sealing between the sealing member 400 and the valve member 600, The structure can be simplified.

In addition, in the receptacle check valve 1 for hydrogen charging according to an embodiment of the present invention, an elastic ring 650 is installed in the valve part 620 so that the elastic ring 650 is an inclined surface 450 of the sealing member 400 . Since it comes into contact before the valve part 620, chattering in which the valve part 620 repeatedly strikes the inclined surface 450 of the sealing member 400 in the low pressure section of the hydrogen tank is prevented, so that during the chattering It is possible to reduce the generated noise and deformation.

Meanwhile, in the above embodiment, the present invention has been described by limiting the receptacle check valve 1 for hydrogen charging used in a hydrogen fuel cell vehicle, but the present invention is not necessarily limited thereto, and high-pressure gas fuel such as LPG is used. It can also be used as the receptacle check valve (1) installed in the fuel tank of various gas vehicles to be filled.

Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential features thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention.

The present invention provides a receptacle check valve for charging hydrogen that improves low-pressure airtight performance with a simple structure and reduces noise and deformation due to chattering in a low-pressure section of a hydrogen tank.

Claims

a first body 100 having a first internal flow path 105 extending from one end to the other end;

A second internal flow path 205 extending from one end to the other end is formed, and one end is inserted into the first internal flow path 105 through the other end of the first body 100 to be coupled to the first body 100 . being a second body 200;

It is disposed in the first internal flow path 105 to seal between the inner circumferential surface of the first body 100 and one end of the second body 200 , and to remove hydrogen introduced into the first internal flow path 105 as the first internal flow path 105 . a sealing member 400 extending from one end to the other end of the third inner passage 405 guiding the second inner passage 205;

an elastic member 500 disposed in the second internal flow path 205; and

A valve member 600 supported by the elastic member 500 and movably disposed in the second internal flow path 205, the valve member 600 having a valve part 620 formed at an end thereof;

The valve part 620 is inserted into the third internal flow path 405 through the other end of the sealing member 400 to open and close the third internal flow path 405, a hydrogen charging receptacle check valve.
The method according to claim 1,

A filter 300 disposed in the first internal flow path 105 to filter foreign substances from the hydrogen introduced into the first internal flow path 105 and guide the hydrogen from which the foreign substances have been filtered to the third internal flow path 405 . ); further including;

The sealing member 400 is a hydrogen charging receptacle check valve coupled to the filter 300 .
The method according to claim 1,

The other end of the sealing member 400 is inserted into the second internal flow path 205 through one end of the second body 200,

On the outer circumferential surface of the sealing member 400 , a flange 410 is in contact with one end of the second body 200 to seal between the inner circumferential surface of the first body 100 and one end of the second body 200 . Formed hydrogen receptacle check valve.
The method according to claim 1,

The inner circumferential surface of the other end of the sealing member 400 into which the valve part 620 is inserted is an inclined surface 450 in which the diameter of the third internal flow path 405 becomes smaller as the closer to one end of the sealing member 400 is. formed,

A receptacle check valve for hydrogen charging in which an elastic ring (650) in contact with the inclined surface (450) is installed in the valve part (620).
5. The method according to claim 4,

The elastic body ring 650 is formed on the inclined surface 450 before the valve part 620 when the valve part 620 is inserted into the third internal flow path 405 through the other end of the sealing member 400 . Receptacle check valve for contacting hydrogen filling.
5. The method according to claim 4,

A coupling groove 655 to which the elastic ring 650 is coupled is formed in the valve part 620,

The valve unit 620 is a hydrogen charging receptacle check valve in which an outer peripheral surface of the end portion 630 disposed on one side of the coupling groove 655 is formed as an inclined surface corresponding to the inclined surface 450 .
6. The method of claim 5,

The sealing member 400 and the valve member 600 are a receptacle check valve for hydrogen charging formed of steel.
The method according to claim 1,

When the hydrogen tank is filled with fuel, at one end of the first body 100, a first charging nozzle for charging fuel at a low pressure, a diameter smaller than the first charging nozzle is formed, and the fuel is charged at a high pressure Among the second charging nozzles, one is coupled,

A partition projection 108 corresponding to the diameter of the second charging nozzle is formed on the inner peripheral surface of one end of the first body 100,

A first installation groove 106 is formed on the inner circumferential surface of the first body 100 disposed on one side of the partition protrusion 108,

A second installation groove 107 having a smaller diameter than the first installation groove 106 is formed on the inner circumferential surface of the first body 100 disposed on the other side of the partition projection 108,

a first sealing ring 110 installed in the first installation groove 106 to seal the first charging nozzle;

The receptacle check for hydrogen charging is formed to have a smaller diameter than the first sealing ring 110 and further includes a second sealing ring 120 installed in the second installation groove 107 to seal the second charging nozzle. valve.
9. The method of claim 8,

A first backup ring 130 disposed on one side of the second sealing ring 120 in the second installation groove 107 to assist the sealing force of the second sealing ring 120;

Hydrogen charging further comprising a second backup ring 140 disposed on the other side of the second sealing ring 120 in the second installation groove 107 to assist the sealing force of the second sealing ring 120 . for receptacle check valves.
The method according to claim 1,

It further includes an O-ring 210 installed on the other surface of the second body 200 to seal a portion coupled to the hydrogen tank,

A receptacle check valve for hydrogen charging in which a groove into which the O-ring 210 is inserted is formed on the other surface of the second body 200 .